Gobal Advanced Research Journal of Environmental Science and Toxicology
July 2012 Vol. 1(4), pp. 080-086
Copyright © 2012 Global Advanced Research Journals

 

Full Length Research Paper

Survey of physical-chemical and microbiological quality of wastewater of the WWTP effluent in Sebkha (Nouakchott, Mauritania)

Abdoulaye Demba N’diaye1, 2*, Mohamed Ould Sid’ Ahmed Ould Kankou3 and Khalid IBNO NAMR 1

1Unit Soil Science and Environment (LGMSS- URAC45), Departement of Geology, Faculty of Science- University Chouaib Doukkali P.O. BOX- El Jadida 2400, Morocco.
2Laboratory of Water Chemistry, Toxicological and Environmental Service, National Institute for Research in Public Health from Nouakchott, P.O. Box 695, Mauritania.
3Laboratory of Chemistry of Water and Environment, Faculty of Science and Technology of the University of Nouakchott, P.O. Box 5026, Mauritania.

*Correspondence     Author    E-mail:   abdouldemba@yahoo.fr; Tel: 212 (0) 523 342 325/ 343 003

Accepted 30 May, 2012

Abstract

The present investigation was conducted to survey the physicochemical parameters (temperature, pH, electrical conductivity, chlorides, nitrates, ammonia, orthophosphates and chemical oxygen demand) and microbiological (coliform coliforms and fecal streptococci) in the effluent of the WWTP in the scope of vegetable Sebkha. Thus, monthly samples of wastewater were carried out of the WWTP between January and December 2009. The results of physicochemical analysis presented in this work have shown those temperatures between 23.9 ° C and 31.3 ° C. The pH is between 6.91 and 8.17. The pH oscillates between neutrality and basicity. The salinity of the effluent was observed by measuring the electrical conductivity and chlorides giving respective maximum values ​​of 7000 µS/cm and 1633 mgL-1 However, the effluent of the WWTP contain potential reserves of nitrogen compounds and phosphate. The microbiological results show that the microbial load of fecal coliforms and fecal streptococci is very important. The levels of fecal coliforms and fecal streptococci varied respectively from 1, 1.104 cfu/100 mL to  2,8.104 cfu/100 mL and from 1,2.103 cfu/100 mL to 3.104cfu/100 mL. The presence of high bacteria indicators of fecal contamination is undoubtedly a threat to the market garden, the children of farmers, retailers and consumers.

Keywords: Physico- Chemical, Microbiological, Effluent, Sebkha, Nouakchott, Mauritania.

 

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