المستخلص: |
The cost price of one cubic meter of purified waste water depends on several factors such as; Workforce; maintenance; energy etc… Our study consists in making a comparison between two cases of quality of water coming from a sewage treatment plant by aerated lagoons. For the first case; it is a purified wastewater with a total operation of the aerators (4/4) 100%, and the second case is that of running at 50% (2/4) of aerators. The results obtained showed that the malfunction and/ or the shutdown of the two aerators of the four existing at the station level contribute to the decrease in the quality of the at the exit of the station the yield of the four months of 2017 (100%) DCO 59.64%, MES 47.72%, DBO 72.26% is higher than the same months of 2018 (50%) DCO 68.0163%, MES 47.96%, DBO 76.60%.
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