Contribution to Management of Wastewater of Yamoussoukro City: Impact of Wastewater Treatment Plants Failure on Environmental Pollution of The Lakes

Abstract

This study, conducted on the sanitation system and the artificial receptor (lakes) of Yamoussoukro environment system was used to evaluate the treatment capacity of wastewater treatment plants (STEP), volumes of wastewater and sludge from urban area this city. The treatment capacity varies between 250 and 2000 equivalent inhabitants (EH). The flow volume of wastewater passing through the STEP is 1597 m³/day. This volume flow generates an annual contribution of mud around 1492 m³ in receiving environments. Diagnosis is noted that only 20% of STEP are functional and 80% others are dysfunctional. The concentration of MES (suspended matter), BOD₅, COD, total nitrogen, total phosphorus and nitrate are higher than the limit values normalized.