The results of the analysis of the samples taken at the entrance and the exit of the treatment plant reveal a marked improvement of the quality of the water after its treatment. We calculated the TREATMENT YIELD according to the following relation: Yield (%) = (XE - XS) / XE * 100. (XE: the effluent content at the inlet of the basin; XS: the content of the effluent at the outlet of the basin).
There is a clear decrease in the COD which goes from a value of 1200 mg / l at the entrance of the station to 40 mg / l at the exit which represents a reduction of 96.66%; BOD5, which goes from an average value of 120.0 mg / l at the entrance of the station to 5 mg / l at the exit which represents a 95.83% reduction; Total Nitrogen (NTK) increased from a value of 16.8 mg / l at the station inlet to 1.4 mg / l at discharge which represents a reduction of 91.66% and total coliforms increased from a value of 28,500 mg / l at the entrance to the station at 2,600 mg / l at the exit which represents a reduction of 67.21%.
To see if our treatment system meets wastewater discharge standards, we compared the values ​​of the different parameters studied to the threshold values ​​of the WHO discharge standards. From this comparison, it appears that the values ​​of the treated water parameters obtained are within the range required by the WHO standard. This confirms the effectiveness of the treatment.