Wastewater and Solid Waste Environmental Degradation Cost in Mohammedia City

The estimation of leachate quantities produced in landfills is necessary to dimension the treatment plants allowing to reduce the polluting load of these effluents and consequently avoid their negative impacts on the environment. Different leachate quantification methods were used in this study to assess the leachate volume produced at the Oum Azza landfill. The water balance method give comparable estimations of leachate production to the Ouled Berjal landfill ratio. The first method showed average values between 487 and 495 m3/day for 2015, 2018, and 2019, and at the same time, the second method gave values between 470 and 477 m3/day for the same years. In contrast, the World Bank ratio showed high values that vary between 2260 and 2295 m3/day for 2015, 2018, and 2019. The on-site data and the statistical analysis showed us that the World Bank ratio is not adapted for the estimation of the leachates produced in Oum Azza landfill, while the water balance and the ratio of Ouled Berjal landfill allowed to give comparable results to reality. 

Critical review for the quantification of leachate production: Evaluation example for the “Oum Azza” public landfill in Rabat city, Morocco

Techniques for treating leachate discharges: A critical review

The present work aims to optimize the leachate treatment of the Mohammedia-Benslimane landfill by coagulation-flocculation using the central composite design. The independent variables studied were pH, coagulant dose, flocculant dose, and stirring time. The response variables studied were turbidity, COD, and absorbance at a wavelength of 254 nm. The results showed that the optimal pH was 6.87, the optimal coagulant dose was 7.89 g/L, the optimal flocculant dose was 12 ml/L, and the optimal stirring time was 22.8 min. These optimal conditions provided the best results for the responses studied. Indeed, turbidity was reduced by 90.38%, COD was reduced by 85.50%, and absorbance at a wavelength of 254 nm was decreased by 55.53%. The analysis of variance indicated that the established models were significant and that they are characterized by a good fit (R2 in the order of 0.97, 0.96, and 0.94 for turbidity, COD, and UV254, respectively). In conclusion, optimizing landfill leachate treatment by flocculation coagulation using the central composite design within response surface methodology yielded promising results for reducing turbidity, COD, and absorbance at a wavelength of 254 nm. This method can be used to optimize landfill leachate treatment in other settings. 

Roukaya Bouyakhsass

Papers

Critical review for the quantification of leachate production: Evaluation example for the “Oum Azza” public landfill in Rabat city, Morocco

Wastewater and Solid Waste Environmental Degradation Cost in Mohammedia City

Techniques for treating leachate discharges: A critical review

Optimization of coagulation-flocculation for landfill leachate treatment: An experimental design approach using response surface methodology

Vegetable Oil Refinery Wastewater Treatment by Using the Cactus as a Bio-flocculant in the Coagulation-Flocculation Process