ÉTUDE ET SUIVI DES PERFORMANCES DES TRAITEMENTS PRIMAIRE ET SECONDAIRE DES EAUX USEES DE LA STATION D’EPURATION DE MARRAKECH

The activated sludge technology is an innovative intensive method for treating wastewater. It is well suited to discharges from communities large sizes and very effective for the treatment of carbon, nitrogen and phosphorus. The raw effluent of the WWTP of Marrakech and secondly evaluate the performance of primary processing (TP) which eliminates almost 50% of suspended solids and reduced by about 40% BOD and COD. Finally we will evaluate the purifying efficiency of secondary treatment (TS), the monitoring results show that it is 95% for BOD5, 80% for COD, 70% for TSS, 85% NTK and 55 % for Pt. The obtained results show that except the Pt qui exceeds the standard set at 2 mg/L, the concentration of all the performance indicators at the outlet of biological treatment (secondary) complies with Moroccan and European standards for direct discharges

The pollution load of wastewater and the performance of the sewage treatment plant of Skhirat city

The Sewage Treatment Plant (STEP) based on Skhirat City receive on average an important volume of wastewater (about 66473 m3 with a flow of 2173.56 m3/day). The aim of this research is to evaluate the pollutant load of wastewater and the performances of the sewage treatment plant of Skhirat city in treating domestic wastewater. Sampling was carried out on the level of the entry of sewage treatment plant with a monthly rate. The analyses were carried at the laboratory with the cubic measure of wastewater received by the sewage treatment plant. The results show that the CODe/BOD5e ratio of 2.08, which makes it possible to confirm the normal state of the station in biological treatment since the ratio is lower than three. The results showed that the rate of the Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD5) and the Suspended Matter (SM) respectively it’s of the order 87,4%, 90,68% and 79,50%. Globally, the results of the investigation revealed by the unilateral test Student, that this difference between the entry and the exit of the station which significant by p-value calculated is lower than the level of significance alpha= 0,05