Valorisation of a wastewater in the treatment of leachate from municipal solid waste in Morocco

Abouri, Meriem; Elmaguiri, Abdelhakim; Souabi, Salah; Aboulhassan, M. A.

doi:10.1504/ijewm.2019.10016796

Cited by 1 publication

(5 citation statements)

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“…From 5 to 10 years, the landfill is known as "middle age" and its leachate has a COD of between about 3000 to 15000 mg/l [20]. After 10 years, a landfill contains less biodegradable material and the leachate has a COD value of less than 2000 mg/l [4,11]. For a given leachate, fluctuations in pH, flow, COD and BOD5 contents, etc.…”

Section: Leachate Characteristicsmentioning

confidence: 99%

“…For a given leachate, fluctuations in pH, flow, COD and BOD5 contents, etc. have been observed over time [4,11]. This can influence the efficiency of the elimination by different treatment techniques and disturb the receiving environment if the leachate is rejected without treatment, which justifies the installation of a homogenization basin.…”

Section: Leachate Characteristicsmentioning

confidence: 99%

“…Rivas and Gimento [27] pointed out that old landfills produce stabilized leachate with a relatively low COD content ranging from 500 to 5000 ppm, a slightly basic pH of 7.5 to 8.5, low biodegradability (BOD5/COD less than 0.1) and a significant amount of heavy metals and high molecular weight compounds (humic and fulvic substances). Leachate exhibits considerable variation in composition [11]. The concentration of contaminants are mainly influenced by the age of the landfill, as well as by the type of waste deposited at the landfill and other hydrogeological factors [11,17].…”

Section: Leachate Characteristicsmentioning

confidence: 99%

“…Leachate exhibits considerable variation in composition [11]. The concentration of contaminants are mainly influenced by the age of the landfill, as well as by the type of waste deposited at the landfill and other hydrogeological factors [11,17].…”

Section: Leachate Characteristicsmentioning

confidence: 99%

“…The flocculation coagulation methods which are the most widely applied for the fight against pollution from leachate discharges [9][10][11][12]. State-of-the-art physico-chemical treatment processes have been developed [13,14] and applied for the decontamination of leachate discharges.…”

Section: Introductionmentioning

confidence: 99%

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Reducing Pollution of Stabilized Landfill Leachate by Mixing of Coagulants and Flocculants: A Comparative Study

Kastali¹,

Mouhir²,

Madinzi³

et al. 2022

Environmental Management - Pollution, Habitat, Ecology, and Sustainability

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The physico-chemical process of coagulation-flocculation is very efficient and economical for the treatment of leachate. The latter can have considerable impacts on the environment. The leachate from the landfill of the city of Mohammedia is characterized by a high COD content which varies between 2200 and 2700 mg/l, a total Kjeldahl nitrogen concentration varying from 1080 to 1405 mg/l while the ammonium content has a concentration varying between 587 and 1410 mg/l. Organic matter is not readily biodegradable (BOD5/COD: 0.2 to 0.13). Metal concentrations ranged from 0.1 to 4.2 mg/l for Cr, 40 to 5 mg/l for Cd, and 0.3 to 0.8 mg/l for lead. For monitoring the leachate treatment, several coagulants and flocculants were used (FeCl3, Al2(SO4)3, Alginate, cationic flocculants, anionic flocculants). In parallel with the monitoring of the physicochemical parameters we followed the production of the volume of the settled sludge over time. Treatment with all coagulants and flocculants used is pH dependent. Ferric Chloride has been shown to be effective at a pH of 6.5 while for Aluminum Sulfate the optimum pH is 5.3. The results showed that coagulation-flocculation by Ferric Chloride and Aluminum Sulfate is very effective in reducing turbidity. This reduction reaches 95 and 98% respectively for FeCl3 and Al2(SO4)3, while the reduction in COD for the two coagulants is around 60%. Organic flocculants alone do not lead to a significant reduction in turbidity and COD, while their combination with coagulants marks a good reduction in pollution. Hydrated iron hydroxides precipitate more easily than flocs formed by aluminum, resulting in more efficient removal of pollutants than that obtained at lower pH values. The order of introduction strongly influences the coagulation flocculation. The optimal doses of the various coagulants and flocculants chosen for the study vary from one reagent to another. FeCl3 remains the most suitable coagulant to further eliminate organic and metal pollution. The cost associated with the treatment using flocculants remains much higher when the flocculant is used in admixture with a coagulant.

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Section: Leachate Characteristicsmentioning

confidence: 99%

Section: Leachate Characteristicsmentioning

confidence: 99%