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BIOGAS PRODUCTION FROM
SEWAGE

 
Overview
•Biogas
•Composition of  biogas
•Advantages and disadvantages
•Biochemical reaction and stages of anaerobic digestion
•Modes of operation
•Types of anaerobic digesters
•Paper presentation
What is biogas?
Biogas  is  a  methane  rich  flammable  gas  that  results  from  the 
decomposition of organic waste material
Biogas  is  produced  by  anaerobic digestion  or  fermentation  of 
biodegradable  materials  such  as  biomass,  manure,  sewage, 
municipal waste, green waste, plant material and energy crops.
Biogas also called as ‘Marsh gas’
Biogas is a type of biofuel. 
This  type  of  biogas  comprises  primarily  methane  and  carbon 
dioxide
Composition of biogas
•
•

Biogas is generated by the activity of anaerobic bacteria
Composition  depends  on:  the  composition  of  raw  material, 
organic  loading  to  digesters,  time  and  temperature  of 
anaerobic digestion

Composition of biogas

 

Substances

Symbol

Percentage

Methane 

CH4 

50 - 70 

Carbon Dioxide 

CO2 

30 - 40 

Hydrogen 

H2 

5 - 10 

Nitrogen 

N2 

1 - 2 

Water vapour 

H2O 

0.3 

Hydrogen Sulphide 

H S 

Traces 
Advantages of biogas
• Production of large amount of methane gas (ambient 
temperature storage)
• Production of free flowing thick sludge
• Odourless sludge
• Sludge can be used as  fertilizer and soil conditioner
• Sanitary way for human and animal waste disposal
• Conservation of scarce resources like wood
Disadvantages
•
•
•
•
•

Explosion chances
High capital lost
Incorrect handling of liquid sludge causes pollution
Requires control and maintenance
Needs proper condition
• Use as a fuel requires removal of CO2 and H2S 
Factors affecting yield and production of 
biogas 
Many factors affecting the fermentation process of 
organic substances under anaerobic condition are, 
 The quantity and nature of organic matter 
 The temperature 
 Acidity and alkanity (PH value) of substrate 
 The flow and dilution of material 
GENERAL FEATURES OF BIOGAS 
Biochemical reactions
Organic matter 

CH4 + CO2 + H2 + NH3 + H2S

Stages of anaerobic digestion:
1.Liquefaction by hydrolytic enzymes
2.Acid formation
3.Methane formation with methanogen production 
Liquefaction by hydrolytic enzymes
• Complex organic matter is degraded to basic structure
by hydraulic bacteria.
 Protein - Polypeptide and Amino Acid
 Fat
-Glycerin and Fatty Acid
 Amylose - Monosacride and Polysacride
Acid Production
• Also called the acidogenesis
• Simple organic matters are converted into acetic acid, H2
and CO2
• Acting bacteria in this process are called hydrogenproducing bacteria and acid-producing bacteria.
Methane Production
• Methanogenesis
• In this process, acetic acid, H2, CO2, are converted into CH4.
• Methane-producing bacteria have strict PH requirement and
low adaptability to temperature.
• Methanococcus jannaschii, Methanobacterium thermoautotrophicum
Flow chart of anaerobic digestion
Modes of operation
• Batch
• Semi-continuous – regular feeding of digester and
decrease of organic matter at intervals

• Continuous – for liquid waste treatment
Continuous-fed System
• Suited for large-scale manure substrate bioreactor.
• Steady biogas production can be expected.
• May require auxiliary equipments.
• Requires high liquid content.
• Temperature, loading rate, and solid content need to be
carefully monitored.
Batch-fed System
•
•
•
•
•
•

The simplest design.
Low cost.
The feedstock is loaded one batch at time.
Irregular biogas production.
Can operate on high solid content.
Requires manual labor.
Types of digesters
A typical biogas system consists of the following components:
•
•
•
•
•

(1) Manure collection
(2) Anaerobic digester
(3) Effluent storage
(4) Gas handling
(5) Gas use.

TWO MAIN TYPES:
1. Digesters utilizing dispersed growth of bacteria
2. Digesters utilizing attached growth of bacteria
DISPERSED GROWTH DIGESTERS
1.
2.
3.
4.
5.
6.

Fixed dome digester
Floating gas holder digester (Indian)
Plug flow digester (horizontal displacement)
Bag digester (Taiwan and Korea)
Separate gas holder digester
Conventional digester
Fixed dome digester
 Drumless digester.

Underground
brick
masonry
compartment
(fermentation chamber)
with a dome on the top
for gas storage.

 The fermentation chamber and gas holder are combined as one unit.
 Eliminates the use of costlier mild steel gas holder which is
susceptible to corrosion.
 20 to 50 years.
Floating gas holder digester
 Jashu Bhai J Patel developed a
design of floating drum biogas
plant
 Popularly known as Gobar Gas
plant.

 In this design, the digester chamber is made of brick masonry in cement
mortar.
 A mild steel drum is placed on top of the digester to collect the biogas
produced from the digester. Thus, there are two separate structures for
gas production and collection.
Bag Biodigester
• It consists of a long cylinder made of PVC or red mud plastic.
• The bag digester was developed to solve the problems experienced
with brick and metal digesters.
Attached growth digesters
1. Anaerobic filter
2. Up-flow anaerobic sludge
blanket (UABSR)
Anaerobic filter
 It consists of a column
filled with a packing
medium.
 A great variety of nonbiodegradable materials
have been used as
packing
media
for
anaerobic filter reactors
such as stones, plastic,
coral, mussel shells,
reeds, and bamboo rings.
 The methane forming bacteria form a film on the large surface of the packing
medium and are not carried out of the digester with the effluent.
 For this reason, these reactors are also known as "fixed film" or "retained film"
digesters.
UASBR

 The UASB reactors contain no packing medium, instead, the
methane forming bacteria are concentrated in the dense granules of
sludge blanket which covers the lower part of the reactor.
 The feed liquid enters from the bottom of the reactor and biogas is
produced while liquid flows up through the sludge blanket.
biogas production from waste
Gas Production potential of various types of dung
Types of Dung

Gas Production Per Kg Dung
(m3)

Cattle (cows and buffaloes)

0.023 - 0.040

Pig

0.040 - 0.059

Poultry (Chickens)

0.065 - 0.116

Human

0.020 - 0.028

Source: www.fao.org.in
biogas production from waste
Material and methods
• The Sewage Treatment Plant has capacity to treat 18 mld sewage
from main pumping station.
• After primary and secondary treatment, sludge is remain left that
is being collected in thickener.
• Around 96X105 liters sludge is being drained from thickener to
digester tank at each 12 hrs.
•
• The sludge was taken from thickener and digester tank and
Temperature, pH, Total solids %, Volatile solids %, and Alkalinity
parameters were analyzed
Results
 The present study was done in the months of winter and
summer and the sampling were done seasonally from the
sewage treatment plant.
 Raw sewage consists of organic and inorganic solids in
dissolved and suspended form with 90-99.9% of water
biogas production from waste
Materials and methods
•

In this study, experiments were conducted to investigate the production of
biogas from municipal solid waste (MSW) and domestic sewage by using
anaerobic digestion process.

•

The MSW is collected from the Perungudi yard at the Chennai metropolitan
city. The yard has an area of approximately 10 km2.

•

Domestic sewage is collected from a college campus before disposal to the
treatment plant. It is used in all digestion experiments for diluting the feedstock
to achieve the required total concentration of TS.

•

The domestic sewage is added to MSW, which is in the form of dry and
shredded waste. Here both the wastes are mixed so that it forms slurry.
Experimental set up
Results
• The digester was operated at different organic feeding rates of 0.5, 1.0,
2.3, 2.9, 3.5 and 4.3 kg of volatile solids (VS)/m3 of digester slurry per
day.
• Biogas generation was enhanced by the addition of domestic sewage to
MSW.
• The maximum biogas production of 0.36m3/kg of VS added per day
occurred at the optimum organic feeding rate of 2.9 kg of VS/m3/day.
References
Henry, C., 2006." What is an Anaerobic biodigester?”
http://manure.unl.edu/adobe/v7n10_01.pdf
http://www.fao.org.in (Biogas technology: a training manual
for extension" (FAO/CMS, 1996)
http://www.habmigern2003.info/biogas/Barondigester/Baron-digester-Dateien/image006.jpg
http://www. en.wikipedia.org/wiki/Biogas
http://www.renewableoil.com/pages/applications.html
http://www.omafra.gov.on.ca/english/engineer/facts/04097.html
Polprasert, C., 1989. Biogas production. In: Organic waste
recycling. John Wiley Sons. Ltd., Great Britain. 105-144
biogas production from waste

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biogas production from waste