Optimization of the treatment of an anaerobic pretreated landfill leachate by a coagulation–flocculation process using experimental design methodology

Bakraouy, Hajar; Souabi, Salah; Digua, Khalid; Dkhissi, Ouafae; Sabar, Muhammad Adnan; Fadil, Mouhcin

doi:10.1016/j.psep.2017.04.017

Cited by 67 publications

(27 citation statements)

References 30 publications

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“…The pH 6.0 was also found as optimal point for pH by Shu et al [8] to pretreat leachate, but the FeCl 3 dosage considered as optimal was lower, 1,200 mg FeCl 3 /L. Other authors [26,27] found an optimal dose of FeCl 3 of, approximately, 4,500 mg FeCl 3 /L, the same of this work, but their pH optimal values were around 8.0. The use of aluminum sulfate as coagulant for leachate treatment in Portugal showed the pH 6.0 as the best operational condition, but using a lower dosage of coagulant (1,027 mg Al 2 (SO 4 ) 3 /L) and, for greater coagulant concentration, there was no increase in the removal of COD (maximum removal of 39%) [28].…”

Section: Leachate Treatmentsupporting

confidence: 72%

“…The predominant mechanism of action of these coagulating agents is the sweep coagulation, in which, depending on the metal salt concentration, the pH value of the mixture, the rapid mixing rate and the nature and distribution of particle sizes, precipitate formation may occur (Al(OH) 3 and Fe(OH) 3 ) [25].…”

Section: Leachate Treatmentmentioning

confidence: 99%

“…Over one billion tons of waste are produced globally and this volume is expected to increase to 2.2 billion tons by 2025 [2]. Disposal in sanitary landfill is the most widely used method of waste management [3][4][5]. This method is considered a safe solution for the treatment of solid waste, in spite of generating leachate and biogas [6].…”

Section: Introductionmentioning

confidence: 99%

“…The coagulation-flocculation process can be an effective pretreatment option for landfill leachate [3,14]. Applying this technique, it is possible to reduce the chemical oxygen demand (COD), turbidity, color, suspended solids and metals with high efficiencies [15], however, its performance depends on coagulant type and dose, pH, velocity gradient of mixing, rapid mixing time, slow mixing time and sedimentation time [16].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Coagulation/flocculation as a pretreatment of landfill leachate for minimizing fouling in membrane processes

Alfaia¹,

Nascimento²,

Bila³

et al. 2019

Desalination and Water Treatment

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a b s t r a c tSeveral works in the literature indicate that the combination of physical-chemical treatment (coagulation/flocculation) and membrane separation process can be a promising alternative for landfill leachate treatment. The objective of the present work was to evaluate the fouling potential in membranes after pretreatment of raw leachate by coagulation/flocculation process. Samples of stabilized leachate from Gericinó controlled landfill (Rio de Janeiro City, Brazil) were used. FeCl 3 and Al 2 (SO 4 ) 3 were applied as coagulating agents. The pH and coagulant dosage were evaluated. Modified fouling index (MFI) and silt density index (SDI) were used to estimate the formation of deposits in the nanofiltration (NF) or reverse osmosis (RO) membranes for leachate treatment. SDI was not significantly reduced despite the great removal of suspended matter by the pretreatment. The MFI of leachate pretreated with FeCl 3 was 100 times lower than the MFI of leachate pretreated with Al 2 (SO 4 ) 3 and about 10,000 times lower than the raw leachate. This can be attributed to the influence that the organic matter exerts on the MFI. Therefore, the results showed coagulation/flocculation would be a good pretreatment for NF or RO treatment of landfill leachate.

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Section: Leachate Treatmentsupporting

confidence: 72%

Section: Leachate Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coagulation/flocculation as a pretreatment of landfill leachate for minimizing fouling in membrane processes

Alfaia¹,

Nascimento²,

Bila³

et al. 2019

Desalination and Water Treatment

View full text Add to dashboard Cite

show abstract

“…Coagulation/flocculation is one of the most common physicochemical processes used for the landfill leachate treatment [5,6]. It is a handy tool used as a pretreatment step to reduce pollutant load, remove recalcitrant compounds and improve the biodegradability of leachate [7].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of influence of coagulation/flocculation and Fenton oxidation with iron on landfill leachate treatment

Smaoui¹,

Mseddi²,

Ayadi³

et al. 2019

Environ. Protect. Eng.

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Landfill leachates (LFL) collected from Sfax (Tunisia) discharge area are characterized by high chemical oxygen demand (COD), ammonium and salts contents. They constitute a source of phytotoxicity and pollution for ground water and surface water resources which requires an adequate treatment process. To evaluate the efficiency of the coagulation/flocculation treatment, special attention was paid to the effect of pH, coagulant and flocculant doses. Then, effect of zero valent iron was also studied alone and in combination with coagulation/flocculation pretreatment. Our results indicate high removal efficiencies by coagulation/flocculation (46% COD and 63% turbidity) and Fenton process (48% COD and 76% turbidity). The combined application of coagulation/flocculation and Fenton revealed higher COD removal (62%) and turbidity reduction (90%). These results showed the applicability of this combined treatment method for the degradation of organic compounds and reduction of the treated leachate toxicity.

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Treatment of intermediate landfill leachate using different anode materials in electrooxidation process

Can

Gazigil

Keyikoğlu

2021

Env Prog and Sustain Energy

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This study aims to investigate the performances of widely used anode materials in the treatment of intermediate landfill leachate treatment by electrooxidation (EO) process. The raw leachate was collected from an 8-year-old landfill facility and had a chemical oxygen demand (COD) of 4660 mg/L, biological oxygen demand (BOD 5 ) of 1370 mg/L, and total organic carbon (TOC) of 2260 mg/L. TOC and COD removal efficiencies of Boron-Doped Diamond (BDD), Pt, and four different Ti-based mixed metal oxide (MMO) anodes ((RuO 2 -TiO 2 , RuO 2 -IrO 2 , PtO 2 -IrO 2 , and IrO 2 -Ta 2 O 5 ) were compared at the current densities of 25 mA/cm 2 , 75 mA/cm 2 , and 125 mA/cm 2 . At the highest current density, the BDD achieved 100% TOC and COD

show abstract

Optimization of the treatment of an anaerobic pretreated landfill leachate by a coagulation–flocculation process using experimental design methodology

Cited by 67 publications

References 30 publications

Coagulation/flocculation as a pretreatment of landfill leachate for minimizing fouling in membrane processes

Coagulation/flocculation as a pretreatment of landfill leachate for minimizing fouling in membrane processes

Evaluation of influence of coagulation/flocculation and Fenton oxidation with iron on landfill leachate treatment

Treatment of intermediate landfill leachate using different anode materials in electrooxidation process

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