L. Traitement-des-effluents, «. , ». , «. , and ». , 61 5.3. Le traitement de l'effluent enrichi en chrome, p.61

P. Etude-du, 67 1.2. Etude de la tension du système, ., p.75

.. Influence-du-chrome-sur-le-traitement-de-la-pollution-organique, 85 3.1. Influence du temps et de la densité de courant sur le traitement, 87 3.3. Influence du métal dissous sur la pollution organique en présence du chrome VI, p.88

P. Gao, X. Chen, F. Shen, and G. Chen, Removal of chromium(VI) from wastewater by combined electrocoagulation?electroflotation without a filter, Separation and Purification Technology, vol.43, issue.2, pp.117-123, 2005.
DOI : 10.1016/j.seppur.2004.10.008

J. I. Garrote, M. Bao, P. Castro, and M. J. Bao, Treatment of tannery effluents by a two step coagulation/flocculation process, Water Research, vol.29, issue.11, pp.2605-2608, 1995.
DOI : 10.1016/0043-1354(94)00312-U

R. Giovanardi, E. Soragni, C. Fontanesi, V. De-renzi, U. Del-pennino et al., On the electroreduction mechanism of Cr(VI) aqueous solutions on iron and copper cathodes, Journal of Electroanalytical Chemistry, vol.576, issue.2, pp.243-252, 2005.
DOI : 10.1016/j.jelechem.2004.10.021

A. K. Golder, N. Hridaya, A. N. Samanta, and S. Ray, Electrocoagulation of methylene blue and eosin yellowish using mild steel electrodes, Journal of Hazardous Materials, vol.127, issue.1-3, pp.134-140, 2005.
DOI : 10.1016/j.jhazmat.2005.06.032

A. K. Golder, A. N. Samanta, and S. Ray, Anionic reactive dye removal from aqueous solution using a new adsorbent???Sludge generated in removal of heavy metal by electrocoagulation, Chemical Engineering Journal, vol.122, issue.1-2, pp.107-115, 2006.
DOI : 10.1016/j.cej.2006.06.003

A. K. Golder, A. N. Samanta, and S. Ray, Removal of trivalent chromium by electrocoagulation, Separation and Purification Technology, vol.53, issue.1, pp.33-41, 2007.
DOI : 10.1016/j.seppur.2006.06.010

A. K. Golder, A. N. Samantha, and S. Ray, Removal of Cr3+ by electrocoagulation with multiple electrodes: Bipolar and monopolar configurations, Journal of Hazardous Materials, vol.141, issue.3, pp.653-661, 2007.
DOI : 10.1016/j.jhazmat.2006.07.025

T. Mcwhinney, E. Grady, D. L. Peterson, and . Cocke, Arsenic removal by electrocoagulation using combined Al-Fe electrode system and characterization of products, Journal of Hazardous Materials, vol.139, pp.220-231, 2007.

J. E. Gregor, C. J. Nokes, and E. Fenton, Optimizing natural organic matter removal from low turbidity waters by controlled pH adjustment of aluminium coagulation, pp.31-2949, 1997.

O. Groterud and L. Smoczynski, Purification of wastewater by electrolysis at continuous flow, Vatten, vol.48, pp.36-40, 1992.

H. K. Hansen, P. Nunez, and R. Grandon, Electrocoagulation as a remediation tool for wastewaters containing arsenic, Minerals Engineering, vol.19, issue.5, pp.521-524, 2006.
DOI : 10.1016/j.mineng.2005.09.048

I. Heidmann and W. Calmano, Removal of Cr(VI) from model wastewaters by electrocoagulation with Fe electrodes, Separation and Purification Technology, vol.61, issue.1, pp.15-41, 2007.
DOI : 10.1016/j.seppur.2007.09.011

I. Heidmann and W. Calmano, Removal of Zn(II), Cu(II), Ni(II), Ag(I) and Cr(VI) present in aqueous solutions by aluminium electrocoagulation, Journal of Hazardous Materials, vol.152, issue.3, pp.934-941, 2008.
DOI : 10.1016/j.jhazmat.2007.07.068

K. R. Henke, Chemistry of heavy metal precipitates resulting from reactions with Thio-Red<SUP>??</SUP>, Water Environment Research, vol.70, issue.6, pp.1178-1185, 1998.
DOI : 10.2175/106143098X123516

D. O. Herer and F. E. Woodard, Electrolytic coagulation of lignin from kraft mill bleach plant wastewaters, p.59, 1976.

B. Holger, Demande internationale de brevets à l'OMPI: Invention pour une installation d'épuration des eaux usées

P. K. Holt, G. W. Barton, and C. Mitchell, The role of current in determining pollutant removal in batch electrocoagulation, 6th World Congress of Chemical Engineering, 2001.

P. K. Holt, G. W. Barton, M. Wark, and C. A. Mitchell, A quantitative comparison between chemical dosing and electrocoagulation, Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol.211, issue.2-3, pp.233-248, 2002.
DOI : 10.1016/S0927-7757(02)00285-6

P. K. Holt, G. W. Barton, and C. A. Mitchell, The future for electrocoagulation as a localised water treatment technology, Chemosphere, vol.59, issue.3, pp.355-367, 2005.
DOI : 10.1016/j.chemosphere.2004.10.023

A. Y. Hosny, Separation of oil from oil/water emulsions using an electroflotation cell with insoluble electrodes, Oil/Water Emulsion Separation-Filtration and separation, pp.419-423, 1992.

Y. Hu and J. M. Prausnitz, Molecular thermodynamics of partially-ordered fluids: Microemulsions, AIChE Journal, vol.34, issue.5, 1998.
DOI : 10.1002/aic.690340511

C. Y. Hu, S. L. Lo, and W. H. Kuan, Effects of co-existing anions on fluoride removal in electrocoagulation (EC) process using aluminum electrodes, Water Research, vol.37, issue.18, pp.4513-4523, 2003.
DOI : 10.1016/S0043-1354(03)00378-6

C. Y. Hu, . Shang-lien, W. Lo, and . Kuan, Simulation the kinetics of fluoride removal by electrocoagulation (EC) process using aluminum electrodes, Journal of Hazardous Materials, vol.145, issue.1-2, pp.180-185, 2007.
DOI : 10.1016/j.jhazmat.2006.11.010

J. G. Ibanez and M. M. Szafran, Laboratory experiments on electrochemical remediation of the environment. Part 4: Color removal of simulated wastewater by electrocoagulationelectroflotation, Journal of Chemical Education, vol.75, pp.1040-1041, 1998.

J. G. Ibanez, M. M. Takimoto, R. C. Vasquez, S. Basak, N. Myung et al., Laboratory Experiments on Electrochemical Remediation of the Environment: Electrocoagulation of Oily Wastewater, Journal of Chemical Education, vol.72, issue.11, 1995.
DOI : 10.1021/ed072p1050

B. Idbelkas and D. Takky, Traitement ??lectrochimique d' eaux us??es charg??es de ph??nol : ??tude comparative sur des ??lectrodes de dioxyde de plomb et de platine, Annales de Chimie Science des Mat??riaux, vol.26, issue.2, pp.33-44, 2001.
DOI : 10.1016/S0151-9107(01)80044-1

S. Irdemez, N. Demircioglu, Y. S. Yildiz, and Z. Bingül, The effects of current density and phosphate concentration on phosphate removal from wastewater by electrocoagulation using aluminum and iron plate electrodes, Separation and Purification Technology, vol.52, issue.2, pp.218-223, 2006.
DOI : 10.1016/j.seppur.2006.04.008

S. Irdemez, Y. S. Yildiz, and V. Tosunoglu, Optimization of phosphate removal from wastewater by electrocoagulation with aluminum plate electrodes, Separation and Purification Technology, vol.52, issue.2, pp.394-401, 2006.
DOI : 10.1016/j.seppur.2006.05.020

S. Islam and M. T. Suidan, Electrolytic denitrification: Long term performance and effect of current intensity, Water Research, vol.32, issue.2, pp.528-536, 1998.
DOI : 10.1016/S0043-1354(97)00286-8

L. J. Jansen and L. Koene, The role of electrochemistry and electrochemical technology in environmental protection, Chemical Engineering Journal, vol.85, issue.2-3, pp.137-146, 2002.
DOI : 10.1016/S1385-8947(01)00218-2

S. Jing-wei, Z. Ya-bing, Z. Zheng, L. Ji-biao, and T. Shu, Yuan-chun, Treatment of tannery wastewater by electrocoagulation, Journal of Environmental Sciences, vol.19, pp.1409-1415, 2007.

C. P. Jordao, J. L. Pereira, and G. N. Jham, Chromium contamination in sediment, vegetation and fish caused by tanneries in the State of Minas Gerais, Brazil, Science of The Total Environment, vol.207, issue.1, pp.1-11, 1997.
DOI : 10.1016/S0048-9697(97)00232-5

G. Mouedhen, M. Feki, M. De-petris-wery, and H. F. Ayedi, Behavior of aluminum electrodes in electrocoagulation process, Journal of Hazardous Materials, vol.150, issue.1, pp.124-135, 2008.
DOI : 10.1016/j.jhazmat.2007.04.090

G. Mouedhen, M. Feki, M. De-petris-wery, and H. F. Ayedi, Electrochemical removal of Cr(VI) from aqueous media using iron and aluminum as electrode materials: Towards a better understanding of the involved phenomena, Journal of Hazardous Materials, vol.168, issue.2-3, pp.983-991, 2009.
DOI : 10.1016/j.jhazmat.2009.02.117

V. Moutarlier, M. P. Gigandet, J. Pagetti, and B. Normand, An electrochemical approach to the anodic oxidation of Al 2024 alloy in sulfuric acid containing inhibitors, Surface and Coatings Technology, vol.161, issue.2-3, pp.267-274, 2002.
DOI : 10.1016/S0257-8972(02)00414-0

V. Moutarlier, M. P. Gigandet, L. Ricq, and J. Pagetti, Electrochemical characterisation of anodic oxidation films formed in presence of corrosion inhibitors, Applied Surface Science, vol.183, issue.1-2, pp.1-9, 2001.
DOI : 10.1016/S0169-4332(01)00364-6

J. Mrozowski and J. Zielinski, Studies of Zinc and Lead removal from industrial wastes by electrocoagulation, Environment Protection Engineering, vol.9, pp.77-85, 1983.

B. Mukhopadhyay, J. Sundquist, and R. J. Schmitz, Removal of Cr(VI) from Cr-contaminated groundwater through electrochemical addition of Fe(II), Journal of Environmental Management, vol.82, issue.1, pp.66-76, 2007.
DOI : 10.1016/j.jenvman.2005.12.005

A. G. Munoz and J. B. Bessone, Effects of different anions on the electrochemical behaviour of In, Electrochimica Acta, vol.43, issue.9, pp.1067-1075, 1998.
DOI : 10.1016/S0013-4686(97)00279-X

W. Murell and . Anthony, Water cleaning system. European patent application No. 87300526, 1987.

M. Murugananthan, G. Bhaskar-raju, and S. Prabhakar, Separation of pollutants from tannery effluents by electro flotation, Separation and Purification Technology, vol.40, issue.1, pp.69-75, 2004.
DOI : 10.1016/j.seppur.2004.01.005

M. Muruganathan, G. B. Raju, and S. Prabhakar, Removal of sulfide, sulfate and sulfite ions by electro coagulation, Journal of Hazardous Materials, vol.109, issue.1-3, pp.37-44, 2004.
DOI : 10.1016/j.jhazmat.2003.12.009

M. Muthukumar, M. T. Karuppiah, and G. Bhaskar-raju, Electrochemical removal of CI Acid orange 10 from aqueous solutions, Separation and Purification Technology, vol.55, issue.2, pp.198-205, 2007.
DOI : 10.1016/j.seppur.2006.11.014

N. Nameri, A. R. Yeddou, H. Lounici, D. Belhocine, H. Grib et al., Defluoridation of septentrional sahara water of north Africa by electrocoagulation process using bipolar aluminium electrodes, Water Research, pp.32-1604, 1998.

C. P. Nanseu-njiki, S. R. Tchamango, P. C. Ngom, A. Darchen, and E. Ngameni, Mercury(II) removal from water by electrocoagulation using aluminium and iron electrodes, Journal of Hazardous Materials, vol.168, issue.2-3, pp.1430-1436, 2009.
DOI : 10.1016/j.jhazmat.2009.03.042

B. Nasr, T. Hsen, and G. Abdellatif, Electrochemical treatment of aqueous wastes containing pyrogallol by BDD-anodic oxidation, Journal of Environmental Management, vol.90, issue.1, pp.523-530, 2009.
DOI : 10.1016/j.jenvman.2007.12.007

E. Ofir, Y. Oren, and A. Adin, Modified equilibrium-solubility domains and a kinetic model of iron oxide and hydroxide colloids for electroflocculation, Desalination, vol.204, issue.1-3, pp.79-86, 2007.
DOI : 10.1016/j.desal.2006.03.535

Ü. B. Ögütveren and S. Koparal, Electrocoagulation for oil-water emulsion treatment, Journal of Environnemental Science and Health, pp.32-2507, 1997.

T. Ohtsuka and H. Yamada, Effect of ferrous ion in solution on the formation of anodic oxide film on iron, Corrosion Science, vol.40, issue.7, pp.1131-1138, 1998.
DOI : 10.1016/S0010-938X(98)00015-8

O. Minghi, Procédé et dispositif de traitement des fluides aqueux d'usinage usés

M. Panayotova and J. Fritsch, Treatment of wastewater from the lead???zinc ore processing industry, Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology, vol.2, issue.9, pp.3-2155, 1996.
DOI : 10.1080/10934529609376483

A. K. Pandey, S. D. Pandey, V. Misra, and A. K. Srimal, Removal of chromium and reduction of toxicity to Microtox system from tannery effluent by the use of calcium alginate beads containing humic acid, Chemosphere, vol.51, issue.4, pp.51-329, 2003.
DOI : 10.1016/S0045-6535(02)00824-X

R. K. Pandit and M. S. Mayadeo, Electrobiological process for treatment of wastewater, Journal of Electrochemistry Society of India, vol.36, pp.111-115, 1987.

M. Pettine, L. Ottone, L. Campanella, F. J. Millero, and R. Passino, The reduction of chromium (VI) by iron (II) in aqueous solutions, Geochimica et Cosmochimica Acta, vol.62, issue.9, pp.1509-1519, 1998.
DOI : 10.1016/S0016-7037(98)00086-6

T. Picard, G. Cathalifaud-feuillade, M. Mazet, and C. Vandensteendam, Cathodic dissolution in the electrocoagulation process using aluminium electrodes, Journal of Environmental Monitoring, vol.2, issue.1, pp.77-80, 2000.
DOI : 10.1039/a908248d

G. Poteaux, Epuration des eaux résiduaires par electrolyse, Techniques Modernes, vol.70, pp.42-44, 1978.

M. Pourbaix and N. Zoubov, Hydrogène, Version remaniée du rapport technique RT, p.du CEBELCOR, 1958.

H. Qian, Y. Wu, Y. Liu, and X. Xu, Kinetics of hexavalent chromium reduction by iron metal, Frontiers of Environmental Science & Engineering in China, vol.14, issue.8, pp.51-56, 2008.
DOI : 10.1021/es048743y

S. Raghu and C. A. Basha, Chemical or electrochemical techniques, followed by ion exchange, for recycle of textile dye wastewater, Journal of Hazardous Materials, vol.149, issue.2, pp.324-330, 2007.
DOI : 10.1016/j.jhazmat.2007.03.087

G. B. Raju, M. T. Karuppiah, S. S. Latha, S. Parvathy, and S. Prabhakar, Treatment of wastewater from synthetic textile industry by electrocoagulation???electrooxidation, Chemical Engineering Journal, vol.144, issue.1, pp.51-58, 2008.
DOI : 10.1016/j.cej.2008.01.008

P. Rastogi, T. K. Rathee, N. K. Saxena, R. Mehra, and . Kumar, BOD analysis of industrial effluents: 5 days to 5 min, Current Applied Physics, vol.3, issue.2-3, pp.191-194, 2003.
DOI : 10.1016/S1567-1739(02)00199-2

J. Ren and Y. Zuo, Study of electrochemical behavior and morphology of pitting on anodized 2024 aluminum alloy, Surface and Coatings Technology, vol.182, issue.2-3, pp.237-241, 2004.
DOI : 10.1016/j.surfcoat.2003.08.082

R. R. Renk, Electrocoagulation of tar sand and oil Shale wastewaters, Energy Progress, vol.8, pp.205-208, 1988.

V. G. Roev and N. V. Gudin, New Aspects of Zinc-Nickel Alloy Co-deposition, Transactions of the IMF, vol.48, issue.5, p.74, 1996.
DOI : 10.4139/sfj1950.33.544

D. Rosso and M. K. Stenstrom, The carbon-sequestration potential of municipal wastewater treatment, Chemosphere, vol.70, issue.8, pp.1468-1475, 2008.
DOI : 10.1016/j.chemosphere.2007.08.057

J. Viguri, A. Andrés, R. Ibanez, C. R. Puente, and A. Irabien, Characterization of metal finishing sludges: influence of the pH, Journal of Hazardous Materials, vol.79, issue.1-2, pp.63-75, 2000.
DOI : 10.1016/S0304-3894(00)00248-X

E. A. Vik, D. A. Carlson, A. S. Eikum, and E. T. Gjessing, Electrocoagulation of potable water, Water Research, vol.18, issue.11, pp.1355-1360, 1984.
DOI : 10.1016/0043-1354(84)90003-4

M. Vilarigues, J. C. Fernandes, L. C. Alves, and R. C. Da-silva, Electrochemical behaviour of chromium-implanted magnesium in hydroxide, chloride and sulphate solutions, Surface and Coatings Technology, vol.202, issue.17, pp.4086-4093, 2008.
DOI : 10.1016/j.surfcoat.2008.02.018

S. Virtanen and M. Büchler, Electrochemical behavior of surface films formed on Fe in chromate solutions, Corrosion Science, vol.45, issue.7, pp.1405-1419, 2003.
DOI : 10.1016/S0010-938X(02)00242-1

A. G. Vlyssides and C. J. Israilides, Detoxification of tannery waste liquors with an electrolysis system, Environmental Pollution, vol.97, issue.1-2, pp.147-152, 1997.
DOI : 10.1016/S0269-7491(97)00062-6

G. M. Walker and L. R. Weatherley, COD removal from textile industry effluent: pilot plant studies, Chemical Engineering Journal, vol.84, issue.2, pp.125-131, 2001.
DOI : 10.1016/S1385-8947(01)00197-8

J. Wang, Inhibitor effects on the anodic behaviour of iron electrodes, Chinese Journal of Oceanology and Limnology, vol.15, pp.156-162, 1997.

M. Wauthelet, Traitement anaérobie des boues et valorisation du biogaz, Faculté des sciences agronomique de Gembloux, Belgique, 2006.

C. H. Weng, Y. T. Lin, T. Y. Lin, and C. M. Kao, Enhancement of electrokinetic remediation of hyper-Cr(VI) contaminated clay by zero-valent iron, Journal of Hazardous Materials, vol.149, issue.2, pp.292-302, 2007.
DOI : 10.1016/j.jhazmat.2007.03.076

A. E. Wilcock, M. Brewster, and G. Peck, Use of electrochemical technology to remove color and other contaminants from textile mill effluents, Environmental Chemistry of Dyes and pigments, 1996.

K. R. Wu and . Hebert, Electrochemical transients during the initial moments of anodic oxidation of aluminum, Electrochimica Acta, vol.47, issue.9, pp.1373-1383, 2002.
DOI : 10.1016/S0013-4686(01)00862-3

G. C. Yang and C. Tsai, Performance evaluation of a simultaneous electrocoagulation and electrofiltration module for the treatment of Cu-CMP and oxide-CMP wastewaters, Journal of Membrane Science, vol.286, issue.1-2, pp.36-44, 2006.
DOI : 10.1016/j.memsci.2006.09.007

C. L. Yang, Electrochemical coagulation for oily water demulsification, Separation and Purification Technology, vol.54, issue.3, pp.388-395, 2007.
DOI : 10.1016/j.seppur.2006.10.019

C. L. Yang and J. Mcgarrahan, Electrochemical coagulation for textile effluent decolorization, Journal of Hazardous Materials, vol.127, issue.1-3, pp.40-47, 2005.
DOI : 10.1016/j.jhazmat.2005.05.050

Y. Yavuz, EC and EF processes for the treatment of alcohol distillery wastewater, Separation and Purification Technology, vol.53, issue.1, pp.135-140, 2007.
DOI : 10.1016/j.seppur.2006.08.022

Y. S. Yildiz, A. S. Koparal, S. Irdemez, and B. Keskinler, Electrocoagulation of synthetically prepared waters containing high concentration of NOM using iron cast electrodes, Journal of Hazardous Materials, vol.139, issue.2, pp.373-380, 2007.
DOI : 10.1016/j.jhazmat.2006.06.044

Z. Zaroual, M. Azzi, N. Saib, and E. Chainet, Contribution to the study of electrocoagulation mechanism in basic textile effluent, Journal of Hazardous Materials, vol.131, issue.1-3, pp.73-78, 2006.
DOI : 10.1016/j.jhazmat.2005.09.021

URL : https://hal.archives-ouvertes.fr/hal-00333538

W. Zhang, P. Singh, E. Paling, and S. Delides, Arsenic removal from contaminated water by natural iron ores, Minerals Engineering, vol.17, issue.4, pp.517-524, 2004.
DOI : 10.1016/j.mineng.2003.11.020

H. Z. Zhao, W. Yang, J. Zhu, and J. R. Ni, Defluoridation of drinking water by combined electrocoagulation: Effects of the molar ratio of alkalinity and fluoride to Al(III), Chemosphere, vol.74, issue.10, pp.1391-1395, 2009.
DOI : 10.1016/j.chemosphere.2008.11.062

B. Zhu, D. A. Clifford, and S. , Comparison of electrocoagulation and chemical coagulation pretreatment for enhanced virus removal using microfiltration membranes, Water Research, vol.39, issue.13, pp.3098-3108, 2005.
DOI : 10.1016/j.watres.2005.05.020

Z. Zong, C. J. Williams, and R. G. Edyvean, Treatment of tannery wastewater by chemical coagulation, Desalination, vol.164, pp.249-259, 2004.

I. Zongo, J. Leclerc, H. A. Maïga, J. Wéthé, and F. Lapicque, Removal of hexavalent chromium from industrial wastewater by electrocoagulation: A comprehensive comparison of aluminium and iron electrodes, Separation and Purification Technology, vol.66, issue.1, pp.159-166, 2009.
DOI : 10.1016/j.seppur.2008.11.012

URL : https://hal.archives-ouvertes.fr/hal-00414939

I. Zongo, A. H. Maiga, J. Wéthé, G. Valentin, J. P. Leclerc et al., Electrocoagulation for the treatment of textile wastewaters with Al or Fe electrodes: Compared variations of COD levels, turbidity and absorbance, Journal of Hazardous Materials, vol.169, issue.1-3, pp.70-76, 2009.
DOI : 10.1016/j.jhazmat.2009.03.072

URL : https://hal.archives-ouvertes.fr/hal-00415087

Q. Zuo, X. Chen, W. Li, and G. Chen, Combined electrocoagulation and electroflotation for removal of fluoride from drinking water, Journal of Hazardous Materials, vol.159, issue.2-3, pp.452-457, 2008.
DOI : 10.1016/j.jhazmat.2008.02.039

«. Choisir-le-programme, . Signal, and . Unique, Saisir sur l'écran tactile la longueur d'onde associée à la gamme mesurée : -420 nm pour la gamme basse (0 ? 150 mg) -620 nm pour les gammes intermédiaire, pp.0-750

. Cependant-si-la-gamme-choisie-est, 0 -150 mg), c'est le pourcentage de transmittance qui doit être relevé. Sur l'écran, à droite, il y a la possibilité de passer en mesure de transmittance en appuyant sur l'inscription %T

L. Rareté and . La, mauvaise répartition des pluies provoquent des migrations de plus en plus fortes des populations principalement du Nord et du centre vers les villes

. La-pointe-nord-est-désertique, avec le Sahel et se transforme graduellement en savane lorsqu'on va vers le sud. On y trouve même des forêts (région de Bobo-Dioulasso et Banfora ainsi que vers Gaoua et les frontières ivoiro-ghanéennes)

L. Burkina-faso-est-un-pays-en-voie-de-développement, Une situation qui s'explique en partie par la faiblesse des ressources naturelles, et de celles des prix de ces ressources naturelles sur le marché mondial, l'aridité des sols et l'absence de leur mise en valeur durant la période coloniale, et la démographie. L'agriculture représente 32% du produit intérieur brut et occupe 80% de la population active. Il s'agit principalement d'élevage mais également

. Dominée-par-le-coton, dont le pays est le premier producteur en Afrique avec 700 000 tonnes en 2006 principalement tournées vers l'exportation, l'économie résiste tant bien que mal à la chute des cours mondiaux

. La-hauteur-d, eau annuelle moyenne des précipitations est de 748 millimètres, soit pour une superficie de 274 000 kilomètres carrés, un volume de précipitations annuelles de 205 km³

. La-quantité-d-'eau-disponible, qui comprend l'ensemble des ressources créées en interne, plus les apports extérieurs éventuels) est de 12,5 km³ par an, soit pour une population de quelques 15 millions d'habitants, un peu plus de 800 m³ par habitant et par an; ce qui peut être considéré comme faible mais actuellement suffisant

. Quoique-peu-Élevé, le Burkina Faso a un réseau hydrographique assez important, surtout dans sa partie méridionale. Les cours d'eau se rattachent à trois bassins principaux : les bassins de la Volta

L. Capitale-ouagadougou-partage-les-entreprises-du-pays-avec-les-centres-principaux-que-sont-bobo-dioulasso, . Koudougou, and . Ouahigouya, Les industries sont plus concentrées dans les trois premières villes. Ouagadougou regorge de nombreuses industries et des centres communautaires qui rejettent des effluents, Nous allons davantage nous intéresser à la pollution par les eaux usées dans la ville de Ouagadougou

. La-superficie-rurale-de, Ouagadougou est estimée à 30 250 hectares, elle s'inscrit dans le schéma directeur de l'aménagement de la ville et de son extension

L. La, zone soudano-sahélienne, marquée par une pluviométrie moyenne de 750 mm d'eau recueillie par an. La saison pluvieuse s'étend de mai à octobre, soit une période de 6 (six) mois. La température moyenne est d'environ 30°C avec une température