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Evens Emmanuel, Martine E Mathieu, Pierre M. Samson, Elmyre Clervil
Université Quisqueya
BP 796, Port-au-Prince, HAITI
e-m...
Wastewater management in Haiti
Human health
Jeopardise the bilogical
equilibrium of ecosystems : loss
of aquatic biodivers...
2
Port-au-Prince Urban wastewater
1 2 3
4 5
3
Urban Wastewater characterization
P1
P2
P3
P4
P5
P6
P7
P8
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
P1 P2 P4 P5 P6 ...
Dredged sediments from
drainage channel of Port-au-
Prince
The bay ecosystems
of Port-au-Prince
Dredged sediments disposal
Ecotoxicological approach for management of
dredging sediments
Daphnia magna Pseudokirchneriella
subcapitata
Phyto toxicit...
Ecohydrological approach
The ecohydrology of an area or region is determined by
climate, geomorphology, plant cover/biota ...
Ecohydrological approach for management of
dredging sediments
Phytotechnology
Terrestrial ecohydrology approaches, based o...
Materials and methods
• 3 samples of
sediments from the
drainage channel
• 1 sample of pilot soil
from an agricutural
farm...
Experimental implementation
• Chemical characterization
of the interstitial water of
dredged sediments
(Nitrates, phosphat...
0
2
4
6
8
10
12
14
16
18
A2 A3 A4
Stations de prélèvement
Teneurenphosphates(mg/L)
PO4
Valeur limite
Phosphate values in i...
Physical parameters of plants
Stations
Parameters
A1 A2 A3 A4
Body diameter
(cm)
0.3 0.4 0.6 0.5
H of the body
(cm)
11.5 1...
Stations
Parameters
A1 A2 A3 A4
H (cm) 42.75 53.65 55.60 55.00
Presence of
fruits
yes yes yes yes
B.- Observations at the ...
N and P in Zea mays L.
Parts Body Roots
Parameters
Stations
N
(g/100g)
P
(g/100g)
N
(g/100g)
P
(g/100g)
A0 1.36 0.013 1.32...
Conclusion
The measured physical parameters reveal that
corn samples raised in the sediments had a
better growth than thos...
UNESCO Chair on Ecohydrology
Humanities: Social Representation of Water in the
population - Assessment of behavioral risk
...
Muchas gracias
Thank you
Merci beaucoup
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Efficiency of Zea mays L. in the retention of nutrients in the interstitial water

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Many chemical substances rejected into the natural environment accumulate in the vases or
muds constituting the sediments. Nowadays, in order to reduce human health and ecological
risks, also to prevent the blockage of drainage channels and manage flood risks, operations
of dredging are accomplished everywhere across the world. In European countries dredged
sediments are used sometimes as manure to fertilizer agricultural soils. In Port-au-Prince,
operations of dredging are usually realized on “Bois-de-Chêne” river or channel. The Channel
sediments are exposed to wastewater from the Urban Community of Port-au-Prince. After the
operations of dredging, the polluted sediments, including solid wastes, are deposited on a site
very close to the bay of Port-au-Prince. This discharge allows to a transfer of pollutants to ocean.
Indeed, these sediments mixed with solid and liquid wastes can contribute to an eutrophication
hazard for the marine ecosystem of Port-au-Prince.
Terrestrial ecohydrology approaches, based on phytotechnology, are mostly used to reduce
and manage hazards or risks linked to contaminated sediments. In order to eliminate pollutants
containing in the polluted dredged sediments from drainage channel of Port-au-Prince.
Zea mays L. has been used, as ecohydrological agent, in this study to reduce the toxicity of
sediments chemical compounds on natural ecosystems.
The analysis of pore water of the sediments taken at three (3) points along the channel has
allowed showing the Toxicity of the experimental material in nitrogen and phosphorus compounds.
The nitrogen (nitrates, ammonia) and phosphorus (phosphate) pollutants were determined
according to the french standards. The phosphate values, in particular, are higher of more than
7 times than the maximum limit (2 mg/L). The latter consisted in trapping the mineral compounds
by the vegetable material. The measured physical parameters reveal that corn samples raised in
the sediments had a better growth than those in the pilot ground from Damien farm. The analysis
of collected plants samples shows the potentialities of Zea mays L in the phytoremediation of
nitrogen and phosphorus.

Publié dans : Environnement
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Efficiency of Zea mays L. in the retention of nutrients in the interstitial water

  1. 1. Evens Emmanuel, Martine E Mathieu, Pierre M. Samson, Elmyre Clervil Université Quisqueya BP 796, Port-au-Prince, HAITI e-mail: evens.emmanuel@gmail.com 62th Annual Meeting of the Southeastern GSA 20 – 21 March 2013 – San Juan, Puerto Rico Efficiency of Zea mays L. in the retention of nutrients in the interstitial water from Port-au-Prince dredged sediments
  2. 2. Wastewater management in Haiti Human health Jeopardise the bilogical equilibrium of ecosystems : loss of aquatic biodiversity ecological Economical umbalance Direct discharge in Aquatic ecosystems R I S K S
  3. 3. 2 Port-au-Prince Urban wastewater 1 2 3 4 5
  4. 4. 3 Urban Wastewater characterization P1 P2 P3 P4 P5 P6 P7 P8 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 P1 P2 P4 P5 P6 P7 P8 Sampling points ConcentrationsofPhosphate(mg/L) Dry season Reany season Treshold values
  5. 5. Dredged sediments from drainage channel of Port-au- Prince The bay ecosystems of Port-au-Prince Dredged sediments disposal
  6. 6. Ecotoxicological approach for management of dredging sediments Daphnia magna Pseudokirchneriella subcapitata Phyto toxicity testBrachydanio rerioEcotoxicity tests
  7. 7. Ecohydrological approach The ecohydrology of an area or region is determined by climate, geomorphology, plant cover/biota dynamics and anthropogenic modifications. By understanding these factors, the potential exists for the application of Phytotechnologies to increase plant biomass and to regulate nutrients and water dynamics, thereby increasing ecosystem carrying capacity, resilience and functionality. This can lead to significant improvements in water quality, enhanced biodiversity, improved agricultural production, potential bioenergy generation, and remediation of degraded ecosystems (SANTIAGO- FANDINO and NEATE, 2002)
  8. 8. Ecohydrological approach for management of dredging sediments Phytotechnology Terrestrial ecohydrology approaches, based on phytotechnology, are mostly used to reduce and manage hazards or risks linked to contaminated sediments.
  9. 9. Materials and methods • 3 samples of sediments from the drainage channel • 1 sample of pilot soil from an agricutural farm • Use of Zea mays L., (gramineae family) A3 A1 A2
  10. 10. Experimental implementation • Chemical characterization of the interstitial water of dredged sediments (Nitrates, phosphate, NH3.. • Chemical analysis of pilot soil, •Physical characterization of plants (diameter and H cm) • Chemical characterization of plants (N and P)
  11. 11. 0 2 4 6 8 10 12 14 16 18 A2 A3 A4 Stations de prélèvement Teneurenphosphates(mg/L) PO4 Valeur limite Phosphate values in interstitial water of dredged sediments
  12. 12. Physical parameters of plants Stations Parameters A1 A2 A3 A4 Body diameter (cm) 0.3 0.4 0.6 0.5 H of the body (cm) 11.5 15.7 19.6 16.0 Roots diameter (mm) 0.2 0.2 1.5 2.0 H of roots. pr. (cm) 4.8 5.9 5.9 5.1 A.- After one month
  13. 13. Stations Parameters A1 A2 A3 A4 H (cm) 42.75 53.65 55.60 55.00 Presence of fruits yes yes yes yes B.- Observations at the end of experimentation
  14. 14. N and P in Zea mays L. Parts Body Roots Parameters Stations N (g/100g) P (g/100g) N (g/100g) P (g/100g) A0 1.36 0.013 1.32 0.020 A1 0.67 0.023 0.14 0.016 A2 0.97 0.0357 0.68 0.023 A3 0.95 0.0244 0.80 0.0154
  15. 15. Conclusion The measured physical parameters reveal that corn samples raised in the sediments had a better growth than those in the pilot soil from agricultural farm. The analysis of collected plants samples shows the potentialities of Zea mays L in the phytoremediation of nitrogen and phosphorus
  16. 16. UNESCO Chair on Ecohydrology Humanities: Social Representation of Water in the population - Assessment of behavioral risk Social sciences (economics): (i) Management of shared water resources (ii) Environmental accounting of water resources Environmental Sciences: Ecotoxicology tropical and process engineering.
  17. 17. Muchas gracias Thank you Merci beaucoup

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