Electrochemical methods for landfill leachate treatment: A review on electrocoagulation and electrooxidation

Guo, Zijing; Zhang, Yang; Jia, Hui; Guo, Jiaran; Meng, Xiangjian; Wang, Jie

doi:10.1016/j.scitotenv.2021.150529

Cited by 97 publications

(25 citation statements)

References 92 publications

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“…The Performance of Electrocoagulation Process in Removing Organic and Nitrogenous Compounds from Landfill Leachate in a Three-Compartment Reactor the material and shape of sacrificial anodes, pH, current density, electrode spacing, conductivity, current density, electrolysis time, and power consumption, may influence the EC performance (Galvão et al 2020;Guo et al 2022). Aluminum and iron electrodes are commonly used due to their low cost and availability.…”

Section: Introductionmentioning

confidence: 99%

The Performance of Electrocoagulation Process in Removing Organic and Nitrogenous Compounds from Landfill Leachate in a Three-Compartment Reactor

Bagastyo¹,

Sidik²,

Anggrainy³

et al. 2022

J. Ecol. Eng.

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In this study, the effectiveness of the electrocoagulation (EC) process was evaluated based on the reduction of organic and nitrogenous contaminants in landfill leachate. A three-compartment electrochemical reactor as pre-treatment of stabilized landfill leachate was carried out ahead of biological treatment. The removal efficiencies of COD, BOD, ammonia, and nitrate were analyzed at pH 4, 6, and 8 with the current densities of 20.83 and 29.17 mA•cm -2 . At pH 4, the highest removal of COD and NH 4 + was obtained, i.e., in the range of 72-81% and 43-59%, respectively. The ratio of BOD 5 /COD was increased after EC, from initially 0.11 to 0.32 at pH 4. In addition, EC effectively removed humic substances in the leachate by targeting a large amount of high molecular weight humic substances, with around 10 3 kDa. However, the higher removal efficiency observed at higher current density leads to higher specific energy consumption. At a current density of 29.17 mA•cm -2 , the specific energy consumption obtained in EC was around 10-17 Wh•g -1 COD and 99-148 Wh•g -1 NH 4 + . This could be decreased up to 50% at an applied current density of 20.83 mA•cm -2 with slightly lower efficiencies.

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Section: Introductionmentioning

confidence: 99%

The Performance of Electrocoagulation Process in Removing Organic and Nitrogenous Compounds from Landfill Leachate in a Three-Compartment Reactor

Bagastyo¹,

Sidik²,

Anggrainy³

et al. 2022

J. Ecol. Eng.

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“…The decrease in the TDS value was higher than the value obtained by Bagastyo et al [13] (49%) but lower than those obtained by Bakry et al [11,14,15] (78%, 70.40%, and 91.50% respectively). According to Galvo et al [16] Guo et al [17] there are several factors that affect the result of electrocoagulation, which are the material and shape of the anode, pH, current density, electrode distance, conductivity, current strength, electrocoagulation time and power.…”

Section: Effect Of Electrolysis Time On Total Dissolved Solid (Tds)mentioning

confidence: 99%

Investigation of time impact on electrocoagulation process to treat ablution wastewater

Mudofir

Taufik²,

Rusdan³

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The ablution ritual performed by Muslims before praying requires large amounts of clean water (3.9 L - 4.42 L/person). This is a challenge that needs to be addressed, as in some places, water is a scarce commodity. This study aims to treat ablution wastewater at Masjid Al-Bukhari UIN Raden Mas Said Surakarta using electrocoagulation. The treated water is expected to be reused for ablution rituals in the mosque. Laboratory-scale research methods were performed to treat ablution wastewater. The effect of electrolysis time was evaluated to determine efficiency of the method on the parameters of pH, temperature, total dissolved solid (TDS), conductivity, and ammonia level. Interestingly, ablution wastewater treated using electrocoagulation meets clean water quality standards. This means that the water is safe to reuse for ablution activities in mosques. The electrolysis time has a significant effect on the increase of pH value and the decrease of ammonia level. TDS levels decreased to 65.3% when treated for 40 min. Meanwhile, the conductivity value decreased to 526 µS/cm from the initial value of 1108 µS/cm when the water was treated for 60 min. Statistically, electrolysis time has a significant effect on the decrease of TDS, conductivity, and ammonia levels (α<0.05).

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“…This decrease is due essentially to the high COD removal rate achieved with SS/TiO 2 /PbO 2 -10%B during the last hour of treatment, since the higher the anode material electrocatalytic activity, the faster the electron transfer rate, and consequently, a large number of hydroxyl radicals can be generated. This leads to the lower energy consumption and lower energy cost of the electrochemical treatment process which represents, thus, a great advantage from an economic perspective [61,62].…”

Section: Average Current Efficiency and Energy Evaluationmentioning

confidence: 99%

Elaboration of Highly Modified Stainless Steel/Lead Dioxide Anodes for Enhanced Electrochemical Degradation of Ampicillin in Water

et al. 2022

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Lead dioxide-based electrodes have shown a great performance in the electrochemical treatment of organic wastewater. In the present study, modified PbO2 anodes supported on stainless steel (SS) with a titanium oxide interlayer such as SS/TiO2/PbO2 and SS/TiO2/PbO2-10% Boron (B) were prepared by the sol–gel spin-coating technique. The morphological and structural properties of the prepared electrodes were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). It was found that the SS/TiO2/PbO2-10% B anode led to a rougher active surface, larger specific surface area, and therefore stronger ability to generate powerful oxidizing agents. The electrochemical impedance spectroscopy (EIS) measurements showed that the modified PbO2 anodes displayed a lower charge transfer resistance Rct. The influence of the introduction of a TiO2 intermediate layer and the boron doping of a PbO2 active surface layer on the electrochemical degradation of ampicillin (AMP) antibiotic have been investigated by chemical oxygen demand measurements and HPLC analysis. Although HPLC analysis showed that the degradation process of AMP with SS/PbO2 was slightly faster than the modified PbO2 anodes, the results revealed that SS/TiO2/PbO2-10%B was the most efficient and economical anode toward the pollutant degradation due to its physico-chemical properties. At the end of the electrolysis, the chemical oxygen demand (COD), the average current efficiency (ACE) and the energy consumption (EC) reached, respectively, 69.23%, 60.30% and 0.056 kWh (g COD)−1, making SS/TiO2/PbO2-10%B a promising anode for the degradation of ampicillin antibiotic in aqueous solutions.

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Electrochemical methods for landfill leachate treatment: A review on electrocoagulation and electrooxidation

Cited by 97 publications

References 92 publications

The Performance of Electrocoagulation Process in Removing Organic and Nitrogenous Compounds from Landfill Leachate in a Three-Compartment Reactor

The Performance of Electrocoagulation Process in Removing Organic and Nitrogenous Compounds from Landfill Leachate in a Three-Compartment Reactor

Investigation of time impact on electrocoagulation process to treat ablution wastewater

Elaboration of Highly Modified Stainless Steel/Lead Dioxide Anodes for Enhanced Electrochemical Degradation of Ampicillin in Water

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