Application of response surface method for coagulation process in leachate treatment as pretreatment for Fenton process: Biodegradability improvement

Moradi, Mahsa; Ghanbari, Farshid

doi:10.1016/j.jwpe.2014.09.002

Cited by 101 publications

(46 citation statements)

References 32 publications

(34 reference statements)

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“…In addition, the zero valent iron used during FO treatment is cheap and nontoxic. These results are in agreement with Ghanbari et al [39] who showed a biodegradability improvement from 0.11 to 0.24 and 0.4 after pretreatment of LFL with coagulation and Fenton process. After, applying the tested pretreatment process, LFL can be classified as a biodegradable effluent and, thus, the anaerobic digestion can be carried out [38].…”

Section: Cod Bod and Nh 4 Reductions Obtained In Each Pretreatmentsupporting

confidence: 93%

Improvement of anaerobic digestion of landfill leachate by using coagulation‐flocculation, Fenton's oxidation and air stripping pretreatments

Smaoui

Mlaik

Bouzid

et al. 2017

Env Prog and Sustain Energy

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In Tunisia, the anaerobic digestion process is regarded as a new alternative for the treatment of landfill leachate (LFL). Raw LFL contained high amounts of organic matter, high ammonia concentrations and low biodegradability. In order to improve anaerobic conditions and biogas yields, pretreatment using coagulation‐flocculation, Fenton oxidation (FO) and air stripping processes were investigated and compared in terms of biogas production. Air stripping process was optimized using Response Surface Methodology (RSM). Central Composite Design (CCD) was used with three factors. Under optimized conditions, removals of 85% ammonia, 26% chemical oxygen demand (COD) were achieved. Coagulation‐flocculation provided an increase in the effluent biodegradability with 46% of COD reduction. Fenton's oxidation allowed reducing 48% COD, 30% of biological oxygen demand (BOD5). The effect of pretreatments was investigated with the biochemical methane potential (BMP) assay. A comparison of three different pretreatment methods of LFL for biogas production was performed. Air stripping was demonstrated as providing a better biogas yield than other pretreatments which reached 588 mL/g CODint. The best methane yield was obtained using air stripping pretreatment under optimized conditions. It can result in more robust and effective anaerobic digestion. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1041–1049, 2018

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Section: Cod Bod and Nh 4 Reductions Obtained In Each Pretreatmentsupporting

confidence: 93%

Improvement of anaerobic digestion of landfill leachate by using coagulation‐flocculation, Fenton's oxidation and air stripping pretreatments

Smaoui

Mlaik

Bouzid

et al. 2017

Env Prog and Sustain Energy

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“…Afterwards, 25 mL EC sludge was used by which less decolorization rate resulted. These results are also in agreement with those reported within literatures where it has been stated that after an optimal concentration of Fe 2+ , further increase in it exhibits negligible efficiency improvement or less efficiency due to adverse effect of excessive ferrous ion dosage [19,31]. Consequently, 20 mL EC sludge with a total iron of 27.7 ± 3 mg/L along with 200 mg/L H 2 O 2 fulfilled the effective ratio of Fe/H 2 O 2 to form the major degrading agent; the hydroxyl radical.…”

Section: Optimum Condition Of the Ec Processsupporting

confidence: 93%

Direct Blue 71 removal by electrocoagulation sludge recycling in photo-Fenton process: response surface modeling and optimization

Moradi

Eslami

Ghanbari

2014

Desalination and Water Treatment

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Feasibility of RSM-optimized electrocoagulation (EC) sludge recycling was studied in photo-Fenton (PF) process for the removal of Direct Blue 71. By EC process, relatively complete decolorization was obtained in pH 8, 20 min, and 150 mA. The produced sludge, in EC process, was evaluated to be used and recycled in PF process experimental runs for two major targets: (1) Degradation of EC sludge as an environmental, concerning by-product; (2) Application of iron species resulted from anodic dissolution during EC process to play the role of catalyst in PF process. PF process was investigated based on the effects of EC sludge volume (total iron) and hydrogen peroxide concentration on decolorization. Besides, the effect of EC sludge recycling on decolorization and mineralization (TOC decrement) was studied. In optimum conditions of PF process (pH 3, 200 mg/L H 2 O 2 , 20 mL EC sludge and 30 min reaction time in the first run), 96.27% decolorization was achieved. In the same conditions, but in 10 min, 67.5% TOC removal was obtained.

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“…Boumechhour et al (2013) reported 64.18 % COD removal at the optimum dosage of 1.2 g/l of FeCl 3 at pH 6. Moradi and Ghanbari (2014) using RSM, employed ferric chloride coagulation as a pre-treatment process for landfill leachate treatment prior to Fenton oxidation and achieved approximately 65, 79 and 95 % removals of COD, color and TSS respectively (pH 7 and 1500 mg/l FeCl 3 ). Rivas et al (2004) combined a sequential coagulation-flocculation and Fenton oxidation process in their study to achieve maximum removal of colloidal particles present in the leachate.…”

Section: Resultsmentioning

confidence: 99%

Coagulation of landfill leachate by FeCl3: process optimization using Box–Behnken design (RSM)

Kumar

Bishnoi

2015

Appl Water Sci

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FeCl 3 coagulation was used to achieve maximum reduction of COD, phosphate, sulfate and color and process optimization (FeCl 3 dosage, pH, reaction time) was done by BBD-RSM. Responses were recorded in terms of EC, COD, phosphate, color and sulfate removal. Variables A (pH) and B (reaction time) were negatively related to removal of COD and phosphate, whereas, C (FeCl 3 dosage) was positive in case of COD removal and negative for phosphate removal. pH and coagulant dosage had negative relationship with color removal; however, reaction time showed positive relationship. In case of percent sulfate removal, variable A (pH) demonstrated negative relationship whereas B (reaction time) and C (FeCl 3 dosage) were found to be positively related. Numerical optimization of the model revealed a maximum reduction of 71, 93, 86 and 99.6 % COD, phosphate, color and sulfate at optimal FeCl 3 dosage = 3 g/l, pH 8, and reaction time = 95 min.

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Application of response surface method for coagulation process in leachate treatment as pretreatment for Fenton process: Biodegradability improvement

Cited by 101 publications

References 32 publications

Improvement of anaerobic digestion of landfill leachate by using coagulation‐flocculation, Fenton's oxidation and air stripping pretreatments

Improvement of anaerobic digestion of landfill leachate by using coagulation‐flocculation, Fenton's oxidation and air stripping pretreatments

Direct Blue 71 removal by electrocoagulation sludge recycling in photo-Fenton process: response surface modeling and optimization

Coagulation of landfill leachate by FeCl3: process optimization using Box–Behnken design (RSM)

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