This work consisted in a technical and scientific study of an integrated wastewater treatment and recycling system. Indeed, sewage treatment is a major economic challenge for agricultural promotion on one hand; in the other hand, improper sewage disposal and the use of untreated wastewater are the major cause of diarrhea and water related diseases. To remediate to the effect of sewage on the environmentstability and enhance a sustainable water resources management, a pilot plant for treatment and recycling of wastewater has been designed and constructed on the site of the campus of the University of Abomey-Calavi (Benin, West Africa). The plant, designed based on the flow, biological and physico-chemical characteristics of the wastewater generated by university halls, consists of an anaerobic pond, a facultative pond and two series of maturation ponds (one is algae based treatment, other macrophytesbased treatment). The effluents from the series are conveyed to two (02) separate fish ponds. The effluent from fish ponds is used for cropsfarming. The land use for the overall system is 1ha 30a. The performance of the plant were evaluated through the monitoring of physico-chemical parameters such as pH, turbidity, total suspended solids (TSS), chemical oxygen demand (COD), biochemical oxygen demand at 20°C after 5 days incubation (BOD5), nitrate, nitrite and phosphate. From the laboratory analysis, the removal efficiencies observed are: 93% and 90% for COD, 97% and 93% for BOD5 respectively for the duckweed based system and algae based system;the percentage of removal of suspended solids is approximately 98% for the two systems.
|Journal||Revue Ivorienne Sciences et Technologie (REVIST)|
|Publication status||Published - 2013|