Evaluation of the Purifying Performance of the WWTP with Aerated Lagoons of Wastewater of the City of Oujda (Morocco)

EasyChair Preprint 4104

Abstract

The objective of this work is to analyze the purification performance of the WWTP of the city of Oujda (Morocco) for reuse of treated wastewater for agricultural irrigation.
The flow measurements are carried out at the entrance to the Oujda WWTP via an ultrasonic flow meter permanently installed. The daily flow of wastewater varies between 33,867 m³ / d and 30,737 m³ / d with an average of 31,926.37 m³ / d. This hydraulic load is significant, it represents 79.81% of the nominal hydraulic design load (40,000 m³ / day).

The raw wastewater at the entrance to the station complies with the characteristics of domestic wastewater for large cities (BOD5 =357.18 mg/l; COD=698.58 mg/l and suspended matter SM=493.14 mg/l).

The results of the physicochemical analysis of the sewage into and out show that:

*Most of the parameters studied respond well to the expected treatment plant wastewater Oujda by aerated lagoon such as pH, temperature, dissolved oxygen, conductivity, BOD5 and suspended matter SM;

* The rate of reduction of BOD5, COD and SM are 84 %, 85 % and 80% respectively;
* The report COD/BOD5 wastewater entering the treatment plant is between 1.75 and 1.95.

These values ​​are below the limit values ​​that are 2, indicating that the effluent to be treated is a domestic wastewater therefore biodegradable kind. Thus the system of wastewater Oujda aerated lagoon waters is well suited for this type of effluent.

Keyphrases: Biodegradability, Morocco, Oujda, WWTP, aerated lagoons, physico-chemical, wastewaters

@booklet{EasyChair:4104,
  author    = {Isslam Belhaili and Ali Alemad and Touria Aissati and Ayoub Elatmani and Aziz El Borjy and Fatimetou Salma Mint Mohamed Ouled Sidi and Monsif Benchikh and Khadija El Kharrim and Driss Belghyti},
  title     = {Evaluation of the Purifying Performance of the WWTP with Aerated Lagoons of Wastewater of the City of Oujda (Morocco)},
  howpublished = {EasyChair Preprint 4104},
  year      = {EasyChair, 2020}}