| The rehabilitation of semi-collective wastewater treatment plants and the construction of new ones in the city of Yaoundéare timely,in a context of general master,causing often,damage to the environment like pollution.The studies carried out,demonstrate risks of chronic toxicities,because the excess of individual risk?EIR?are all superior to 1.10-6 per person per year for the employees who mainly deal with the tasks of managing the sludge and the screening in the enclosure.This demonstrates a probabilistic appearance of cancers in these employees.In order to put in place an integrated risk management plan for all future stations,the concerns of local residents and wastewater treatement plant?WWTP?staff have been taken into considerations.Through the surveys carried out,it has been observed that more than 70%of the people interviewed do not know the role of the wastewater treatement plan?WWTP?and more than 48%of the same population make poor waste management in toilets.In addition,the method of analysis of system malfunctions?MASM?and a method of scientific analysis,risk assessment,highlight sludge as the main source of danger and people as the main target source.Moreover,the physico-chemical analyzes made at the entrance and at the exit of the purification stations confirms the high risk that the surrounding population run.The process of collection of wastewater up to the purification plants presents several dysfunctions.So the results of the water samples analyzed at the exit of the treatment plants after treatment could be better.As well as before and after the outlet,we confirm the pollution of the watercourse connecting to the water leaving the stations;It should also be noted that this pollution also attacks underground flows,the surrounding wells,because people complain of diseases caused by the water they use.These results enable the implementation of an Environmental and Social Management Plan?ESMP?that does not exist in the various treatment plants studied. |
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