Combined heterogeneous Electro-Fenton and biological process for the treatment of stabilized landfill leachate

Baiju, Archa; Gandhimathi, R.; Ramesh, S.; Nidheesh, P.V.

doi:10.1016/j.jenvman.2018.01.019

Cited by 127 publications

(38 citation statements)

References 42 publications

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“…Given that the pH is an indicator of evolution phases of leachates in a TLC, and considering that the observed pH was alkaline and around (8.7), Hamici leachates were in the so‐called methanogenic phase. As referred by Kjeldsen et al (), Foo and Hameed (), and Baiju et al (), the pH is relatively basic due to the decrease in the ionized free volatile fatty acid concentration from previous acidogenic phase and also because of the presence of soluble alkaline substances in the waste buried.…”

Section: Resultsmentioning

confidence: 94%

“…In fact, climate is one of the most influential factors in the composition of leachates in the short term, making the leachate quality very difficult to predict. Otherwise, the fluctuations of leachates composition are not only due to the climate, but other several factors may be the cause (Baiju et al, ; Sil & Kumar, ): Chemical, physical, and biological reactions which operate in the waste massif during the decomposition process; Nature and age of buried waste; landfilling mode; and landfill geometry; Evolution in the space: on the same, TLC leachate characteristics change from a sampling spot to another; this reflects the difference in infiltration of water through the top cover of the landfill. Indeed, leachates are not representative of degradation state of the whole massif, because within a dump, water flow that percolates through the massif is not uniform due to the existence of preferential flow paths.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, it should be noted that at lower pH (<3), major amount of total iron exists in the form of Fe 2+ and Fe 3+ (Baiju et al, ). Indeed, the reaction between Fe 2+ and H 2 O 2 (Equation ) occurs at the beginning of the electrolysis and generates · OH and Fe 3+ .…”

Section: Resultsmentioning

confidence: 99%

“…Sanitary landfill is one of the major waste management in many countries around the world (Biglarijoo, Mirbagheri, Ehteshami, & Simin, ). It is a treatment solution that allows waste to degrade into stabilized materials, under controlled conditions and at a lower cost (Baiju, Gandhimathi, Ramesh, & Nidheesh, ).…”

Section: Introductionmentioning

confidence: 99%

“…Conventional biological or physical processes are considered the most appropriate for the decontamination of young leachates (<5 years; Baiju et al, ; Lopez, Pagano, Volpe, & Claudio Di Pinto, ; Umar, Aziz, & Yusoff, ). By contrast, to treat intermediate (between 5–10 years) and mature leachates (more than 10 years), which contain more refractory compounds with a complex structure consisting mainly of humic and fulvic acids (Kamaruddin, Yusoff, Aziz, & Hung, ).…”

Section: Introductionmentioning

confidence: 99%

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Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

Rouidi

Maurício

Boukhrissa

et al. 2019

Water Environment Research

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The feasibility of the electro-Fenton (EF) process to improve the biodegradability of Algerian leachates was examined, in order to prepare this kind of flux for conventional biological treatment. This work also included, for the first time in Algeria, the control and monitorization of a landfill-the "Hamici" landfill. Several physicochemical parameters were determined allowing its classification into an intermediate degradation phase, namely considering their alkaline pH (8.7), high ammonium concentration (3,120 mg/L), low content in heavy metals, and biodegradability (BOD 5 / COD = 0.22). The effects of important parameters such as current intensity, treatment time, and temperature on COD removal have been studied and optimized by using response surface analysis of a central composite design, where 91.1% of COD was removed with a treatment time of 285 min, a current intensity of 3 A, and a temperature of 20°C. A biodegradability test, which was performed on a solution electrolyzed with 120 min, 2 A, and 20°C, allowed to improve the leachates biodegradability from 0.2 to 0.42, with a removal rate of COD and TOC of 53.35% and 34.5%, respectively. However, the current efficiency declined from 137% to 76.6% when the current intensity was rise from 0.5 to 2 A. These results showed the relevance of EF process applied on raw intermediate leachates and its possible benefit in the Algiers leachates treatment processes. Thus, it was concluded that biological treatment can be combined with EF process for optimal mineralization of leachates with clear advantages in this studied location. • Practitioner points• Characterization and treatment of leachates by electro-Fenton (EF) process were carried out. • The leachates are intermediate type and therefore biologically recalcitrant. • The operating parameter for EF process were modeled and optimized by the central composite design. • Current intensity of 2 A reduces COD and TOC of 53.35% and 34.5%, respectively. • The ratio BOD 5 /COD increased from 0.2 to 0.42 after 120 min of electrolysis time.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

Rouidi

Maurício

Boukhrissa

et al. 2019

Water Environment Research

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Importance of Chloride Addition on Arsenite Removal by Aluminium Electrocoagulation

et al. 2020

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Effect of chloride addition on arsenite removal by electrocoagulation process was carried out in this study. Electrocoagulation experiments were executed in a 5 L capacity rectangular tank equipped with 7 anodes and 7 cathodes. Addition of chloride significantly enhanced the arsenite removal efficiency of electrocoagulation process and the removal is purely by the separation process, rather than the oxidation of arsenite to arsenate by electrolytically generated active chlorine. 250 mg L−1 of chloride was found as optimal, and more than 99 % of arsenite were removed from its initial concentration of 1 mg L−1 at pH 6, applied voltage of 5 V, and 60 min of electrolysis. Sludge produced after electrocoagulation treatment was analyzed by scanning electron microscopy (SEM) / energy dispersive X‐ray analysis (EDAX), X‐ray diffraction (XRD), and Fourier transforms infrared (FTIR) techniques.

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Alternative treatment of olive mill wastewater by combined sulfate radical‐based advanced electrocoagulation processes

Yazici Guvenc,

Tunc

2023

Water Environment Research

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The aim of this study is to investigate the performance of advanced electrocoagulation (EC) process for the treatment of olive mill wastewater. In EC process, iron plates were used as electrodes, and peroxydisulfate (PS) and peroxymonosulfate (PMS) were added as oxidants. The effects of the initial pH value, current density, oxidant dose, and electrolysis time were optimized for pollutant removal from olive mill wastewater by EC‐PS and EC‐PMS processes. Control experiments showed that addition of oxidants to the conventional EC process increased the pollutant removal efficiency. Classical optimization method was used to determine optimum conditions, which were initial pH 4, current density 40 mA/cm2, oxidant dose 5 g/L, and electrolysis time 30 min for both processes. Under these conditions, EC‐PS and EC‐PMS processes achieved 50.5% and 48.9% chemical oxygen demand (COD), 93.8% and 89.3% total phenol, 87.7% and 83% UV254, and 74.5% and 64.1% total suspended solid removal efficiencies. Quenching experiments were performed to determine the dominant radical species participating in the processes. It was observed that hydroxyl and sulfate radicals were involved in both processes but hydroxyl radicals were more active. Specific energy consumption was calculated as 5.90 kWh/kg COD for EC process, 4.95 kWh/kg COD for EC‐PS process, and 5.20 kWh/kg COD for EC‐PMS process. The organic removal/sludge ratio of EC‐PS process was found to be higher with 17.5 g/L value. Although the application of EC‐PS and EC‐PMS processes alone is insufficient to meet the discharge limits, they have been found to be effective in olive mill wastewater treatment.Practitioner Points Peroxydisulfate (PS) and peroxymonosulfate (PMS)‐based advanced electrocoagulation (EC) was used in olive mill wastewater treatment. 50.5% chemical oxygen demand (COD), 93.8% TP, 87.7% UV254, and 74.5% TSS removals were achieved by EC‐PS. 48.9% COD, 89.3% TP, 83% UV254, and 64.1% TSS removals were obtained by EC‐PMS. Hydroxyl and sulfate radicals were involved in both processes.

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Combined heterogeneous Electro-Fenton and biological process for the treatment of stabilized landfill leachate

Cited by 127 publications

References 42 publications

Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

Importance of Chloride Addition on Arsenite Removal by Aluminium Electrocoagulation

Alternative treatment of olive mill wastewater by combined sulfate radical‐based advanced electrocoagulation processes

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