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Civil and Environmental Research                                                         www.iiste.org
ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online)
Vol.3, No.2, 2013

    An Evaluation of the Energy Consumption and Co2 Emission
 associated with Corn Cob Ash Compared with the Cement Clinker
                          Yinusa. A. Jimoh1 and Olanrewaju A. Apampa2
                  1
                    Department of Civil Engineering, University of Ilorin, Nigeria.
        2
          Department of Civil Engineering, Moshood Abiola Polytechnic, Abeokuta, Nigeria.
                      *Email of corresponding author: pampasng@yahoo.com
Abstract
This study compares the energy consumption and the carbon dioxide emission associated with
the production of Corn Cob Ash with a view to determining its viability and environmental
sustainability as a pozzolan. CCA meeting the requirements of ASTM C618-12 (1994) was
produced through two separate processes of open air burning and controlled incineration in an
electric muffle furnace. In the first method the quantity of kerosene fuel used in the burning
process was measured used in computing the external energy input and the associated CO2
emission, using published World Bank data on heating, thermodynamic property and carbon
content of various fuels. In the second method, the energy consumption was computed as a
product of the name plate rating (in KW) of the muffle furnace and the time taken (in hours) to
turn the measured quantity of corn cob to ash. The result reveals the ash yield of corn cob as an
average of 3.6% and 1.7% for open air burning and controlled incineration respectively.
Corresponding values for energy consumption were 4.3MJ and 216166MJ per kg of ash
respectively. CO2 emission associated with the fuel consumption in open air burning was 0.27Kg
per Kg of pozzolanic ash. These compare more favorably with the corresponding data of 5.16MJ
and 0.97Kg CO2 established for Portland cement clinker production; in that less energy was
consumed and less CO2 was emitted and at the same time found an alternative use for the
biomass waste. The paper concludes that CCA is a viable and environmentally sustainable
source of pozzolan when it is derived from burning processes that take advantage of corn cob as a
fuel, rather than being specially burnt in a furnace. The paper therefore recommends that biomass
waste be should be promoted as a clean energy source and the resulting ash harnessed as
pozzolan as a way of reducing the consumption of cement; leading to reduced green house gas
emissions and contribution to global warming from the construction industry.
Keywords: Carbon dioxide emission, Cement, Corn cob ash, energy consumption, global
warming, pozzolan

1.0 Introduction
A number of biomass residues are increasingly being identified as pozzolans. Utilization of Rice
Husk Ash is particularly well developed in the rice producing regions of the United States and
Thailand; rice husk is first used as fuel in the rice parboiling plants, with further utilization of the
ash residue as pozzolan in making special quality cement concrete (Chungsangunsit et al, 2007).
Other biomass residues whose ashes have been identified as having pozzolanic properties include
Bamboo Leaf Ash (Dwiveldi et al, 2006), Palm Fruit Ash (Olonode, 2010), Locust Bean Pod Ash
(Adama and Jimoh, 2011), and Corn Cob Ash (Adesanya and Raheem, 2009). The interest in the
application of biomass ash residues as pozzolan is further propelled by the global concern for the
environment, in terms of sustainable development, renewable energy, reduction in energy
consumption and green house gas emissions. In the construction industry, the fact that nearly 1kg
of CO2 is released to the atmosphere for every kilogram of Portland cement produced (USDoE,
                                                   1
Civil and Environmental Research                                                    www.iiste.org
ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online)
Vol.3, No.2, 2013

2003) has further emphasized the need to find alternatives to Portland cement if the contribution
of the construction industry to global warming is to be reduced. This is presumed on the fact that
an economic advantage of certain percentage of savings is possible with application of pozzolans
to cement in concrete works. In fact the advocacy for further use of ashes produced from the
conversion of vegetation biomass waste as chemical stabilizer for poor and weak road soils
(Adama and Jimoh 2012 and Oluremi et al. 2012) is an added motivation of this study.
This paper is focused on the energy consumption and the CO2 emission associated with the
production of pozzolan from a typical biomass waste, the corn cob ash in comparison with the
benchmark established for Portland cement production. Data from two burning processes (open
air burning and incineration in an electric muffle furnace) are compared in terms of pozzolanic
quality, ash yield, energy consumption and CO2 emission.

2.0 Materials and Methods
2.1 Materials
Corn cobs were obtained from the heaps of waste cobs which abound in Maya (7o12’ N) a major
corn producing rural community in the Derived Savannah Agro-ecological zone of Oyo State in
Southwestern Nigeria. Producing at an annual rate of 7.3million tones (FAOSTAT, 2010),
Nigeria ranks 13th among the corn producing countries of the world, with a corresponding
generation of waste cobs across the country.
2.2 Production of Corn Cob Ash Pozzolan with open air burning (Figure 1)
A measured quantity of corn cob was gathered in a heap, sprinkled with a measured quantity of
kerosene fuel and set on fire. Mass (weight) measurements were done using Contech electronic
weighing balance for the kerosene and the Avery weighing balance for the corn cob at moisture
content earlier determined by the standard methods of soil mechanics BS 1377:2000 (BSI 2000).
The temperature of the corn cob was monitored with a Greisinger digital pyrometer as it turned
from cob to char and to ash to ensure that the temperature was kept below the crystallization
temperature of 650oC (Zevenhoven, 2001; Zych, 2008). Maximum temperature attained was
590oC. The ash residue was thereafter gathered and weighed on the Contech electronic weighing
scale. The process was repeated in 4 batches and the results are as presented in Table 1.
The energy consumption Ec and the CO2 emission presented in Table 1 above were derived from
equations 1 and 2 respectively which were developed elsewhere (Apampa 2012); and which were
also based on World Bank estimates and standard values (World Bank, 1992) for the energy
content and CO2 emission for each fuel. By considering the case of kerosene, equation 1 reduces
to 2
Ec = 50Wk + 31Wc + 16Ww                      (Apampa, 2012)                                (1)
Ec = 50Wk                                                                                 (2)
Where Ec = Energy consumption in MJ
Wk = quantity of kerosene consumed in kg
Wc = quantity of charcoal consumed in kg
Ww = quantity of firewood consumed in kg
Where as in this case only kerosene has been used as fuel, equation 1 reduces to:
Likewise, the CO2 emission presented in Table 1 is from Equations 3 and 4 as equally derived
from the technical data sheet of the World Bank (World Bank, 1992) which is itself based on the
carbon content of each fuel. Equation 3 reduces to 4 for kerosene as the fuel.

                                                 2
Civil and Environmental Research                                                     www.iiste.org
ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online)
Vol.3, No.2, 2013

Cf = 3.13Wk + 3.28Wc + 1.74Ww               (Apampa, 2012)
        (3)
Cf = 3.13Wk                                                                               (4)
Where Cf is the quantity of CO2 emission from the burning fuel measured in kg.

2.3 Corn Cob Ash production with a controlled burning in an electric muffle furnace
A measured quantity of corn cob was chopped to maximum size of 12mm put in an electric
muffle furnace, Carbolite Type Elf 11/148 (power rating of 2.6KW and an internal volume of 14
liters) of the Pharmaceutical Technology Department of the Moshood Abiola Polytechnic,
Abeokuta, Nigeria, shown in Figure 2.
The temperature of the furnace was to 600oC, which was attained in a period of 15 minutes and
maintained for a continuous period of 10hours. After the cob has visibly turned to ash, the residue
was recovered and weighed. This was repeated 12 times and the average of the results is as
presented in Table 2.

2.4 Physical and Chemical Analysis of the Ash
Sample of ash residue from each of the two burning processes (Figure 4) were separately passed
through a 1.18mm sieve and sent for analysis at the analytical laboratory of Lafarge-WAPCO
Cement Factory in Ewekoro, Ogun State Nigeria. The result is presented in Table 4 alongside the
requirements of ASTM C618-12 (1994) for identification and classification as a pozzolan.

2.5 Corresponding values from Portland cement clinker production
Since one of the major objectives of the study is to compare with the cement production energy
and environmental degradation, such as some green house emission, data base for the cement
clinker was imported for ease of assessment. A study of energy use for cement clinker production
in Canada (OEE, 2001) shows a range of 4.78 – 6.21MJ/kg of clinker and an average of
5.16MJ/Kg, while carbon dioxide emission has been estimated as a total of 0.97kg for every kg
of clinker made up of 0.54kg in pyroprocessing and 0.43 kg from the fuels burned (USDoE,
2003). These are summarized together with the foregoing results in Table 3
3.0 Results and Discussion
3.1 The ash yield
Corn cob ash yield of 3.6% and 1.7% obtained for open air burning and electric muffle furnace is
low when compared with 18-20% reported for rice husk ash (Subbukrishna et al, 2009;
Chungangunsit et al, 2009). It is however quite close to the figure of 4% deducible from recent
work on locust bean pod ash (Adama and Jimoh, 2012). Ash yield data on palm fruit ash, bamboo
leaf ash and other biomass pozzolans have not been reported in existing literature. The low ash
content of corn cob does not support its conversion to pozzolan to be economical but however
makes it quite suitable as a bio-energy feed stock alone or when co-fired with other fuels (Zych,
2008). The relatively wide disparity in the ash yields from each of the two methods (up to about
50%) is attributable to the different combustion kinetics (Zevenhoven, 2001). While the
maximum temperature of 590oC was attained over a 2 hour period in open air burning, the
maximum temperature of 600oC was attained in the muffle furnace in 15 minutes.
3.2 Conversion technology
Since one of the objectives of this research effort is to compare burning technology, furnace and
open air and possibly recommend an appropriate one, the results clearly show that open air
                                                 3
Civil and Environmental Research                                                     www.iiste.org
ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online)
Vol.3, No.2, 2013

burning and any other technology that takes advantage of the corn cob as a fuel will make the
harnessing of the ash residue as pozzolan viable and sustainable. In spite of the apparent
inefficiency of the method of open air burning adopted for this work, the distinct advantage of
open air burning over electric muffle furnace was demonstrated. This is attributable to the fact
that open air burning takes advantage of the characteristic of corn cob as a fuel, whereas electric
muffle furnace depends solely on external energy source.
3.3 The gas emissions
The CO2 emission was computed only for the external energy input as 0.27kg per kg ash for open
air burning and compared with total emission of 0.97kg for the cement clinker. This is because
while all the CO2 released in cement production is from non renewable sources, the CO2 released
from the thermal decomposition of corn cob being a biomass is considered carbon neutral
(Chungsangunsit et al, 2009). The CO2 emission associated with the production of CCA in a
muffle furnace could not be ascertained because in Nigeria, the electricity grid is fed from a mix
of thermal and hydropower sources. However, the high energy input of 216166MJ per kg of
pozzolanic ash is indicative of the inappropriateness of this method in terms of cost and
environmental sustainability.
4.0 Conclusion and Recommendation
It can be concluded from these results that:
    a) the ash content of corn cob at 3.6% for open air burning but only 1.7% from the
        controlled furnace burning; which are quite low when compared with rice husk ash which
        is about 20%.

   b) the corn cob is more sustainable as a source of bio-energy whose ash residue can be
      recovered for use as a pozzolan rather than its being burnt solely for the ash content.

   c) Corn cob can be promoted as a fuel source in rural areas, with a view to recovering the for
      further use as pozzolan class C conforming with ASTM C618-12 (1994).

   It is therefore recommended that corn cob be promoted as a non-fossil fuel source and that
   production of pozzolan should be in the rural and regional zones where its abundant
   production is more feasible than the urban developed areas with more pronounced
   competitiveness for land for farming. The further possibility of value addition when the ash
   residue is recovered as well as the environmental and health benefits of reducing the large
   stock of biomass waste will ensure a higher quality of life in the rural corn producing regions.

References
Adama, Y.A, and Jimoh, Y.A.,(2011). Production And Classification of Locust Bean Pod Ash
      (LBPA) as a Pozzolan. Available at www.engineeringcivil.com [29 January 2012]
Adama, Y.A., and Jimoh, Y.A. (2012). The Sustainability and Viability of Locust bean Pod
      Extracts/Ashes in the Waste Agricultural Biomass Recycle for Pavement Works.
      Proceedings of the 4th Annual and 2nd International Conference of Civil Engineering,
      University of Ilorin, Nigeria. 4th – 6th July 2012, pp 166 – 175.
Adesanya, D.A. and Raheem, A.A. (2009) Development of corn cob ash blended cement. Journal
      of Construction and Building Materials 23. Available at www.sciencedirect.com [June 6
      2011]
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Civil and Environmental Research                                                   www.iiste.org
ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online)
Vol.3, No.2, 2013

Apampa, O.A. (2012). An Investigation of Corn Cob Ash as a Pozzolan and Chemical Stabilizer
        for Pavement Materials. A PhD proposal (unpublished)
ASTM Specifications C618 -12 (1994). Standard Specification for coal fly ash and raw or
        calcined natural pozzolan for use in concrete.
Chungsangunsit, T., Gheewla, H., and Patumsawad, S., (2009). Emission Assessment of Rice
        Husk Combustion for Power Production. World Academy of Science, Engineering and
        Technology Journal. Vol 53 p 1070 – 1075. Available at www.waset.org/journals/waset
        [March 4 2012]
Dwivedi, V.N., Singh, N.P., Das, S.S. and Singh N.B. (2006). A new pozzolanic material for the
        cement industry: bamboo leaf ash. International Journal of Physical Sciences Vol. 1 (3),
        pp. 106 – 111. Available on line at www.academicjournals.org/IJPS
OEE, (2001). Energy Consumption Benchmark Guide: Cement Clinker Production. A
        Publication of the Office of Energy Efficiency, Ottawa, Canada. Available on line at:
        www.oee.nrcan.gc.ca/publications/industrial/cement-clinker
Olonode, K.A. (2010). Prospect of Agro-By-Products As Pozzolans in Concrete For Low-Cost
        Housing Delivery in Nigeria. Proceedings of the International Conference of the Obafemi
        Awolowo University, Faculty of Technology. Vol. 1 pp. 217 – 221.
Subbukrishna, D.N., Suresh, K.C., Paul, P.J., Dasappa, S., and Rajan, N.K.S. (2007). Precipitated
        Silica From Rice Husk Ash by IPSIT process. Proceedings of the 15th Biomass Conference
        and Exhibition, Berlin, pp 2091 – 2093.
United States Department of Energy (2003). Energy and Emission Reduction Opportunities for
        the Cement Industry. Technical Paper for Industrial Technologies Program. December
        2003.Available at : www.1.eere.energy.gov/industry/ [24 October 2011]
World Bank, (1992). CO2 Emissions by the Residential Sector: Environmental Implications of
        Inter-fuel Substitution. March 1992. Washington.
Yu, F., Ruan, R., and Steele, P. (2008). Consecutive Reaction Model for the Pyrolysis of Corn
        Cob. Transactions of the American Society of Agricultural and Biological Engineers. Vol.
        51(3): 1023 – 1028
Zevenhoven, M (2001). Ash Forming Matter in Biomass Fuels. Academic Dissertation.
        Department of Chemical Engineering, Abo Akademi. Finland. Available at
        www.abo.fi/instut/pcg/
Zych, D., (2008). The Viability of Corn Cob as a Bioenergy Feedstock. On line material available
at www.renewables.morris.umn.edu/biomass [25 march 2012]

•   Y.A. Jimoh (PhD) is a Professor of Civil Engineering in the Civil Engineering Department of
    the University of Ilorin, Nigeria and a practicing engineer with specialties in pavement
    design and construction. He is a member of the Nigerian Society of Engineers and has served
    as resource person at many engineering conferences and training programs. Professor Jimoh
    has published over sixty (60) papers in local and international journals and conference
    proceedings. Tel:+234-8035741851, Email: dryajimoh@yahoo.com

•   O.A. Apampa is lecturer in civil engineering in the civil engineering department of the
    Moshood Abiola Polytechnic, Abeokuta, Nigeria. He is a practicing engineer and a member
    of the Nigerian Society of Engineers, with over 25 years experience on a wide range of
    engineering projects. He has to his credit over 15 papers in conference proceedings and
                                                 5
Civil and Environmental Research                                               www.iiste.org
ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online)
Vol.3, No.2, 2013

   journal publications. He is currently pursuing a Doctor of Philosophy Degree in the Civil
   Engineering Department of the University of Ilorin, Nigeria. Tel: +234-8061664780, Email:
   pampasng@yahoo.com




Figure 1: Open air burning




Figure 3: Corn Cob in Electric Muffle Furnace



                                                 6
Civil and Environmental Research                                               www.iiste.org
ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online)
Vol.3, No.2, 2013




Figure 4: Corn Cob Ash
Table 1: Resource Consumption Data from Open Air Burning
s/n Dry        Kerosene No of Energy       CO2        Ash     Energy            CO2
      weight Wk         hours Consumed emission yield         consumption/kg    emission/kg
      of       (kg)             Ec         Cf         Wash    Ash               Ash
      corn                      MJ         (Kg)       (Kg)    (MJ/Kg)           (Kg/Kg)
      cob
      (Kg)
1     8.5      0.027    8       1.35       0.085      0.304   4.441             0.280
2     8.3      0.026    9       1.30       0.081      0.297   4.377             0.273
3     8.3      0.025    8       1.25       0.078      0.298   4.195             0.262
4     8.1      0.026    8.5     1.30       0.081      0.301   4.319             0.269
Ave 8.3        0.026    8.375 1.30         0.081      0.300   4.333             0.270

Table 2: Ash yield data from a 2.6Kw Muffle Furnace
s/n Dry            Ash      Ash      No of Energy            Energy      Energy
     weight of yield        yield    hours     Consumption   Consumption Consumption/Kg
     corn cob (g)           (%)                KwH           MJ          Ash
     (g)                                                                 MJ/Kg
ave 260.77         4.33     1.66     10        260           936         216166

Table 3: Comparison of energy consumption and CO2 emission data, CCA vs Portland cement
PRODUCT                        ENERGY CONSUMPTION            CARBON              DIOXIDE
                               MJ/KG PRODUCT                 EMISSION
                                                             KG/KG PRODUCT
CCA (open air burning)         4.33                          0.271
CCA (electric muffle furnace) 216166                         Not computed
Portland cement                5.16                          0.97



                                                 7
Civil and Environmental Research                                          www.iiste.org
ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online)
Vol.3, No.2, 2013

Table 4: Chemical Analysis of Corn Cob Ash from Two Processes
Constituent               Percentage
                          Open Air            Muffle Furnace    ASTM          C618-12
                                                                Requirement
SiO2                        63.60                65.40          SiO2+Al2O3+Fe2O3≥70%
Al2O3                       5.85                 5.80
Fe2O3                       2.95                 2.97
CaO                         3.50                 3.70
MgO                         2.11                 2.3
SO3                         1.14                 1.10
K2O                         8.42                 8.39
Na2O                        0.45                 0.48
Mn2O3                       0.06                 0.06
P2O5                        2.42                 2.45
TiO2                        0.60                 0.61
LOI                         8.55                 6.49           10% max for Classes N
                                                                and F, 6% max for Class
                                                                C
Total                       99.65                99.75
Residue (45 micron)         34.32                32.45          35% max
Residue (90 micron)         11.78                9.62




                                                 8
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An evaluation of the energy consumption and co2 emission

  • 1. Civil and Environmental Research www.iiste.org ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online) Vol.3, No.2, 2013 An Evaluation of the Energy Consumption and Co2 Emission associated with Corn Cob Ash Compared with the Cement Clinker Yinusa. A. Jimoh1 and Olanrewaju A. Apampa2 1 Department of Civil Engineering, University of Ilorin, Nigeria. 2 Department of Civil Engineering, Moshood Abiola Polytechnic, Abeokuta, Nigeria. *Email of corresponding author: pampasng@yahoo.com Abstract This study compares the energy consumption and the carbon dioxide emission associated with the production of Corn Cob Ash with a view to determining its viability and environmental sustainability as a pozzolan. CCA meeting the requirements of ASTM C618-12 (1994) was produced through two separate processes of open air burning and controlled incineration in an electric muffle furnace. In the first method the quantity of kerosene fuel used in the burning process was measured used in computing the external energy input and the associated CO2 emission, using published World Bank data on heating, thermodynamic property and carbon content of various fuels. In the second method, the energy consumption was computed as a product of the name plate rating (in KW) of the muffle furnace and the time taken (in hours) to turn the measured quantity of corn cob to ash. The result reveals the ash yield of corn cob as an average of 3.6% and 1.7% for open air burning and controlled incineration respectively. Corresponding values for energy consumption were 4.3MJ and 216166MJ per kg of ash respectively. CO2 emission associated with the fuel consumption in open air burning was 0.27Kg per Kg of pozzolanic ash. These compare more favorably with the corresponding data of 5.16MJ and 0.97Kg CO2 established for Portland cement clinker production; in that less energy was consumed and less CO2 was emitted and at the same time found an alternative use for the biomass waste. The paper concludes that CCA is a viable and environmentally sustainable source of pozzolan when it is derived from burning processes that take advantage of corn cob as a fuel, rather than being specially burnt in a furnace. The paper therefore recommends that biomass waste be should be promoted as a clean energy source and the resulting ash harnessed as pozzolan as a way of reducing the consumption of cement; leading to reduced green house gas emissions and contribution to global warming from the construction industry. Keywords: Carbon dioxide emission, Cement, Corn cob ash, energy consumption, global warming, pozzolan 1.0 Introduction A number of biomass residues are increasingly being identified as pozzolans. Utilization of Rice Husk Ash is particularly well developed in the rice producing regions of the United States and Thailand; rice husk is first used as fuel in the rice parboiling plants, with further utilization of the ash residue as pozzolan in making special quality cement concrete (Chungsangunsit et al, 2007). Other biomass residues whose ashes have been identified as having pozzolanic properties include Bamboo Leaf Ash (Dwiveldi et al, 2006), Palm Fruit Ash (Olonode, 2010), Locust Bean Pod Ash (Adama and Jimoh, 2011), and Corn Cob Ash (Adesanya and Raheem, 2009). The interest in the application of biomass ash residues as pozzolan is further propelled by the global concern for the environment, in terms of sustainable development, renewable energy, reduction in energy consumption and green house gas emissions. In the construction industry, the fact that nearly 1kg of CO2 is released to the atmosphere for every kilogram of Portland cement produced (USDoE, 1
  • 2. Civil and Environmental Research www.iiste.org ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online) Vol.3, No.2, 2013 2003) has further emphasized the need to find alternatives to Portland cement if the contribution of the construction industry to global warming is to be reduced. This is presumed on the fact that an economic advantage of certain percentage of savings is possible with application of pozzolans to cement in concrete works. In fact the advocacy for further use of ashes produced from the conversion of vegetation biomass waste as chemical stabilizer for poor and weak road soils (Adama and Jimoh 2012 and Oluremi et al. 2012) is an added motivation of this study. This paper is focused on the energy consumption and the CO2 emission associated with the production of pozzolan from a typical biomass waste, the corn cob ash in comparison with the benchmark established for Portland cement production. Data from two burning processes (open air burning and incineration in an electric muffle furnace) are compared in terms of pozzolanic quality, ash yield, energy consumption and CO2 emission. 2.0 Materials and Methods 2.1 Materials Corn cobs were obtained from the heaps of waste cobs which abound in Maya (7o12’ N) a major corn producing rural community in the Derived Savannah Agro-ecological zone of Oyo State in Southwestern Nigeria. Producing at an annual rate of 7.3million tones (FAOSTAT, 2010), Nigeria ranks 13th among the corn producing countries of the world, with a corresponding generation of waste cobs across the country. 2.2 Production of Corn Cob Ash Pozzolan with open air burning (Figure 1) A measured quantity of corn cob was gathered in a heap, sprinkled with a measured quantity of kerosene fuel and set on fire. Mass (weight) measurements were done using Contech electronic weighing balance for the kerosene and the Avery weighing balance for the corn cob at moisture content earlier determined by the standard methods of soil mechanics BS 1377:2000 (BSI 2000). The temperature of the corn cob was monitored with a Greisinger digital pyrometer as it turned from cob to char and to ash to ensure that the temperature was kept below the crystallization temperature of 650oC (Zevenhoven, 2001; Zych, 2008). Maximum temperature attained was 590oC. The ash residue was thereafter gathered and weighed on the Contech electronic weighing scale. The process was repeated in 4 batches and the results are as presented in Table 1. The energy consumption Ec and the CO2 emission presented in Table 1 above were derived from equations 1 and 2 respectively which were developed elsewhere (Apampa 2012); and which were also based on World Bank estimates and standard values (World Bank, 1992) for the energy content and CO2 emission for each fuel. By considering the case of kerosene, equation 1 reduces to 2 Ec = 50Wk + 31Wc + 16Ww (Apampa, 2012) (1) Ec = 50Wk (2) Where Ec = Energy consumption in MJ Wk = quantity of kerosene consumed in kg Wc = quantity of charcoal consumed in kg Ww = quantity of firewood consumed in kg Where as in this case only kerosene has been used as fuel, equation 1 reduces to: Likewise, the CO2 emission presented in Table 1 is from Equations 3 and 4 as equally derived from the technical data sheet of the World Bank (World Bank, 1992) which is itself based on the carbon content of each fuel. Equation 3 reduces to 4 for kerosene as the fuel. 2
  • 3. Civil and Environmental Research www.iiste.org ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online) Vol.3, No.2, 2013 Cf = 3.13Wk + 3.28Wc + 1.74Ww (Apampa, 2012) (3) Cf = 3.13Wk (4) Where Cf is the quantity of CO2 emission from the burning fuel measured in kg. 2.3 Corn Cob Ash production with a controlled burning in an electric muffle furnace A measured quantity of corn cob was chopped to maximum size of 12mm put in an electric muffle furnace, Carbolite Type Elf 11/148 (power rating of 2.6KW and an internal volume of 14 liters) of the Pharmaceutical Technology Department of the Moshood Abiola Polytechnic, Abeokuta, Nigeria, shown in Figure 2. The temperature of the furnace was to 600oC, which was attained in a period of 15 minutes and maintained for a continuous period of 10hours. After the cob has visibly turned to ash, the residue was recovered and weighed. This was repeated 12 times and the average of the results is as presented in Table 2. 2.4 Physical and Chemical Analysis of the Ash Sample of ash residue from each of the two burning processes (Figure 4) were separately passed through a 1.18mm sieve and sent for analysis at the analytical laboratory of Lafarge-WAPCO Cement Factory in Ewekoro, Ogun State Nigeria. The result is presented in Table 4 alongside the requirements of ASTM C618-12 (1994) for identification and classification as a pozzolan. 2.5 Corresponding values from Portland cement clinker production Since one of the major objectives of the study is to compare with the cement production energy and environmental degradation, such as some green house emission, data base for the cement clinker was imported for ease of assessment. A study of energy use for cement clinker production in Canada (OEE, 2001) shows a range of 4.78 – 6.21MJ/kg of clinker and an average of 5.16MJ/Kg, while carbon dioxide emission has been estimated as a total of 0.97kg for every kg of clinker made up of 0.54kg in pyroprocessing and 0.43 kg from the fuels burned (USDoE, 2003). These are summarized together with the foregoing results in Table 3 3.0 Results and Discussion 3.1 The ash yield Corn cob ash yield of 3.6% and 1.7% obtained for open air burning and electric muffle furnace is low when compared with 18-20% reported for rice husk ash (Subbukrishna et al, 2009; Chungangunsit et al, 2009). It is however quite close to the figure of 4% deducible from recent work on locust bean pod ash (Adama and Jimoh, 2012). Ash yield data on palm fruit ash, bamboo leaf ash and other biomass pozzolans have not been reported in existing literature. The low ash content of corn cob does not support its conversion to pozzolan to be economical but however makes it quite suitable as a bio-energy feed stock alone or when co-fired with other fuels (Zych, 2008). The relatively wide disparity in the ash yields from each of the two methods (up to about 50%) is attributable to the different combustion kinetics (Zevenhoven, 2001). While the maximum temperature of 590oC was attained over a 2 hour period in open air burning, the maximum temperature of 600oC was attained in the muffle furnace in 15 minutes. 3.2 Conversion technology Since one of the objectives of this research effort is to compare burning technology, furnace and open air and possibly recommend an appropriate one, the results clearly show that open air 3
  • 4. Civil and Environmental Research www.iiste.org ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online) Vol.3, No.2, 2013 burning and any other technology that takes advantage of the corn cob as a fuel will make the harnessing of the ash residue as pozzolan viable and sustainable. In spite of the apparent inefficiency of the method of open air burning adopted for this work, the distinct advantage of open air burning over electric muffle furnace was demonstrated. This is attributable to the fact that open air burning takes advantage of the characteristic of corn cob as a fuel, whereas electric muffle furnace depends solely on external energy source. 3.3 The gas emissions The CO2 emission was computed only for the external energy input as 0.27kg per kg ash for open air burning and compared with total emission of 0.97kg for the cement clinker. This is because while all the CO2 released in cement production is from non renewable sources, the CO2 released from the thermal decomposition of corn cob being a biomass is considered carbon neutral (Chungsangunsit et al, 2009). The CO2 emission associated with the production of CCA in a muffle furnace could not be ascertained because in Nigeria, the electricity grid is fed from a mix of thermal and hydropower sources. However, the high energy input of 216166MJ per kg of pozzolanic ash is indicative of the inappropriateness of this method in terms of cost and environmental sustainability. 4.0 Conclusion and Recommendation It can be concluded from these results that: a) the ash content of corn cob at 3.6% for open air burning but only 1.7% from the controlled furnace burning; which are quite low when compared with rice husk ash which is about 20%. b) the corn cob is more sustainable as a source of bio-energy whose ash residue can be recovered for use as a pozzolan rather than its being burnt solely for the ash content. c) Corn cob can be promoted as a fuel source in rural areas, with a view to recovering the for further use as pozzolan class C conforming with ASTM C618-12 (1994). It is therefore recommended that corn cob be promoted as a non-fossil fuel source and that production of pozzolan should be in the rural and regional zones where its abundant production is more feasible than the urban developed areas with more pronounced competitiveness for land for farming. The further possibility of value addition when the ash residue is recovered as well as the environmental and health benefits of reducing the large stock of biomass waste will ensure a higher quality of life in the rural corn producing regions. References Adama, Y.A, and Jimoh, Y.A.,(2011). Production And Classification of Locust Bean Pod Ash (LBPA) as a Pozzolan. Available at www.engineeringcivil.com [29 January 2012] Adama, Y.A., and Jimoh, Y.A. (2012). The Sustainability and Viability of Locust bean Pod Extracts/Ashes in the Waste Agricultural Biomass Recycle for Pavement Works. Proceedings of the 4th Annual and 2nd International Conference of Civil Engineering, University of Ilorin, Nigeria. 4th – 6th July 2012, pp 166 – 175. Adesanya, D.A. and Raheem, A.A. (2009) Development of corn cob ash blended cement. Journal of Construction and Building Materials 23. Available at www.sciencedirect.com [June 6 2011] 4
  • 5. Civil and Environmental Research www.iiste.org ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online) Vol.3, No.2, 2013 Apampa, O.A. (2012). An Investigation of Corn Cob Ash as a Pozzolan and Chemical Stabilizer for Pavement Materials. A PhD proposal (unpublished) ASTM Specifications C618 -12 (1994). Standard Specification for coal fly ash and raw or calcined natural pozzolan for use in concrete. Chungsangunsit, T., Gheewla, H., and Patumsawad, S., (2009). Emission Assessment of Rice Husk Combustion for Power Production. World Academy of Science, Engineering and Technology Journal. Vol 53 p 1070 – 1075. Available at www.waset.org/journals/waset [March 4 2012] Dwivedi, V.N., Singh, N.P., Das, S.S. and Singh N.B. (2006). A new pozzolanic material for the cement industry: bamboo leaf ash. International Journal of Physical Sciences Vol. 1 (3), pp. 106 – 111. Available on line at www.academicjournals.org/IJPS OEE, (2001). Energy Consumption Benchmark Guide: Cement Clinker Production. A Publication of the Office of Energy Efficiency, Ottawa, Canada. Available on line at: www.oee.nrcan.gc.ca/publications/industrial/cement-clinker Olonode, K.A. (2010). Prospect of Agro-By-Products As Pozzolans in Concrete For Low-Cost Housing Delivery in Nigeria. Proceedings of the International Conference of the Obafemi Awolowo University, Faculty of Technology. Vol. 1 pp. 217 – 221. Subbukrishna, D.N., Suresh, K.C., Paul, P.J., Dasappa, S., and Rajan, N.K.S. (2007). Precipitated Silica From Rice Husk Ash by IPSIT process. Proceedings of the 15th Biomass Conference and Exhibition, Berlin, pp 2091 – 2093. United States Department of Energy (2003). Energy and Emission Reduction Opportunities for the Cement Industry. Technical Paper for Industrial Technologies Program. December 2003.Available at : www.1.eere.energy.gov/industry/ [24 October 2011] World Bank, (1992). CO2 Emissions by the Residential Sector: Environmental Implications of Inter-fuel Substitution. March 1992. Washington. Yu, F., Ruan, R., and Steele, P. (2008). Consecutive Reaction Model for the Pyrolysis of Corn Cob. Transactions of the American Society of Agricultural and Biological Engineers. Vol. 51(3): 1023 – 1028 Zevenhoven, M (2001). Ash Forming Matter in Biomass Fuels. Academic Dissertation. Department of Chemical Engineering, Abo Akademi. Finland. Available at www.abo.fi/instut/pcg/ Zych, D., (2008). The Viability of Corn Cob as a Bioenergy Feedstock. On line material available at www.renewables.morris.umn.edu/biomass [25 march 2012] • Y.A. Jimoh (PhD) is a Professor of Civil Engineering in the Civil Engineering Department of the University of Ilorin, Nigeria and a practicing engineer with specialties in pavement design and construction. He is a member of the Nigerian Society of Engineers and has served as resource person at many engineering conferences and training programs. Professor Jimoh has published over sixty (60) papers in local and international journals and conference proceedings. Tel:+234-8035741851, Email: dryajimoh@yahoo.com • O.A. Apampa is lecturer in civil engineering in the civil engineering department of the Moshood Abiola Polytechnic, Abeokuta, Nigeria. He is a practicing engineer and a member of the Nigerian Society of Engineers, with over 25 years experience on a wide range of engineering projects. He has to his credit over 15 papers in conference proceedings and 5
  • 6. Civil and Environmental Research www.iiste.org ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online) Vol.3, No.2, 2013 journal publications. He is currently pursuing a Doctor of Philosophy Degree in the Civil Engineering Department of the University of Ilorin, Nigeria. Tel: +234-8061664780, Email: pampasng@yahoo.com Figure 1: Open air burning Figure 3: Corn Cob in Electric Muffle Furnace 6
  • 7. Civil and Environmental Research www.iiste.org ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online) Vol.3, No.2, 2013 Figure 4: Corn Cob Ash Table 1: Resource Consumption Data from Open Air Burning s/n Dry Kerosene No of Energy CO2 Ash Energy CO2 weight Wk hours Consumed emission yield consumption/kg emission/kg of (kg) Ec Cf Wash Ash Ash corn MJ (Kg) (Kg) (MJ/Kg) (Kg/Kg) cob (Kg) 1 8.5 0.027 8 1.35 0.085 0.304 4.441 0.280 2 8.3 0.026 9 1.30 0.081 0.297 4.377 0.273 3 8.3 0.025 8 1.25 0.078 0.298 4.195 0.262 4 8.1 0.026 8.5 1.30 0.081 0.301 4.319 0.269 Ave 8.3 0.026 8.375 1.30 0.081 0.300 4.333 0.270 Table 2: Ash yield data from a 2.6Kw Muffle Furnace s/n Dry Ash Ash No of Energy Energy Energy weight of yield yield hours Consumption Consumption Consumption/Kg corn cob (g) (%) KwH MJ Ash (g) MJ/Kg ave 260.77 4.33 1.66 10 260 936 216166 Table 3: Comparison of energy consumption and CO2 emission data, CCA vs Portland cement PRODUCT ENERGY CONSUMPTION CARBON DIOXIDE MJ/KG PRODUCT EMISSION KG/KG PRODUCT CCA (open air burning) 4.33 0.271 CCA (electric muffle furnace) 216166 Not computed Portland cement 5.16 0.97 7
  • 8. Civil and Environmental Research www.iiste.org ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online) Vol.3, No.2, 2013 Table 4: Chemical Analysis of Corn Cob Ash from Two Processes Constituent Percentage Open Air Muffle Furnace ASTM C618-12 Requirement SiO2 63.60 65.40 SiO2+Al2O3+Fe2O3≥70% Al2O3 5.85 5.80 Fe2O3 2.95 2.97 CaO 3.50 3.70 MgO 2.11 2.3 SO3 1.14 1.10 K2O 8.42 8.39 Na2O 0.45 0.48 Mn2O3 0.06 0.06 P2O5 2.42 2.45 TiO2 0.60 0.61 LOI 8.55 6.49 10% max for Classes N and F, 6% max for Class C Total 99.65 99.75 Residue (45 micron) 34.32 32.45 35% max Residue (90 micron) 11.78 9.62 8
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