Electrochemical treatment of sewage sludge and pathogen inactivation

Jafari, Maasoomeh; Botte, Gerardine G.

doi:10.1007/s10800-020-01481-6

Cited by 24 publications

(14 citation statements)

References 39 publications

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“…However, with conventional cell lysis methodologies, it is difficult to simultaneously realize low cost, optimum cell lysis effect and minimum environmental impact. In contrast, electrochemical oxidation is an environmentally friendly technique with low requirements for chemicals, little pollution, and good application prospects for sludge cell lysis [25][26][27][28]. At present, there are two main research directions regarding sludge treatment using electrochemical oxidation.…”

Section: Introductionmentioning

confidence: 99%

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Han

Zhou

et al. 2021

Water

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Working on sludge with electrochemical oxidation is beneficial to promote the subsequent recessive growth of microorganisms in the sludge. To achieve the on-site sludge reduction, this study combined the anoxic/oxic (A/O) process with the electrochemical oxidation process based on the cell lysis-cryptic growth theory by determining the experimental conditions and mechanism of electrochemical cell lysis. The sludge reduction and effluent treatment of the combined process in practical operation were studied. The results showed that the cumulative sludge discharge had been reduced by 37.1% compared with that of the A/O process, and the apparent sludge yield had been reduced by 39.1% during the 30-day operation time, indicating that the electrochemical-A/O combined process could have a considerable sludge reduction effect. After the treatment, chemical oxygen demand (COD), ammonium nitrogen, and total nitrogen in the effluent of the combined process reached 33.02 mg/L, 0.83 mg/L, and 9.95 mg/L, respectively. Due to the limitation of the A/O process, the removal of total phosphorus was poor. As a result, poly aluminum chloride (PAC) was employed to achieve a chemical removal of phosphorus, by which the total phosphorus (TP) of the effluent was controlled to be lower than 0.5 mg/L.

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Section: Introductionmentioning

confidence: 99%

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Han

Zhou

et al. 2021

Water

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“…Electrochemical treatment is a robust, scalable, and environmentally friendly approach that has been widely studied for wastewater treatment processes. For instance, to improve sludge dewaterability ( She et al, 2016 ; Masihi and Badalians Gholikandi, 2018 ; Cai et al, 2019 ; Lu et al, 2022 ), to enhance biogas recovery from anaerobic digestion ( Barrios et al, 2021 ; Hao Huang et al, 2021 ), for sludge conversion and pathogen removal ( Zeng et al, 2019 ; Jafari and Botte, 2021 ; Martínez-Huitle and Brillas, 2021 ), for pollutant removal ( Qiao and Xiong, 2021 ), and for nutrient recovery such as nitrogen and phosphorous ( Arslan et al, 2017 ; Yang et al, 2020 ; Xu et al, 2021 ). Our previous research has shown that electrochemical treatment of WAS under alkaline conditions could improve sludge defragmentation and solubilization ( Jafari and Botte, 2021 ), electrochemically enhanced digestors.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical valorization of waste activated sludge for short-chain fatty acids production

Jafari

Botte

2022

Front. Chem.

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A tremendous amount of waste activated sludge (WAS) ends up in landfilling even after a substantial retention time during anaerobic digestion. This leftover activated sludge is an organic-rich material with the high potential to produce value-added chemicals such as short chain fatty acids (SCFAs). In the present study, a novel electrochemical conversion of activated sludge (E-WAS) was carried out on the surface of non-precious electrodes (nickel, stainless-steel and copper) in alkaline media at low applied potential and temperature. Cyclic voltammetry showed that Cu (II)/Cu (III) and Ni (II)/Ni(III) redox couple catalyzed the WAS oxidation reaction to produce SCFAs and hydrogen. The results revealed that Cu(II)/Cu(III) has higher catalytic oxidation capability towards SCFAs. Yields of 48.7, 21.4, and 14.6 mg SCFAs per g of volatile solids were achieved by using copper, nickel and stainless-steel as working electrodes, respectively. Post analysis characterization techniques indicate that copper oxide films lead to WAS oxidation. Total volatile solid removal of 30% was obtained at 35°C and 1.65 V in 0.2 M NaOH after 2 h of operation in an electrochemical digestor with copper electrodes which is more efficient than a conventional alkaline treatment (24 h, 55%, 1M NaOH). Ammonia was produced as the by-product of E-WAS oxidation. The highest amount of ammonia (250 mg L−1) was obtained by using nickel as the working electrode after 2 h operation at 35°C and 1.35 V applied potential. The change in WAS morphology revealed that the copper oxide film is an effective electrocatalyst for WAS disinfection.

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“…The current cell lysis methods do not meet several requirements, including those for affordability, efficiency, and low environmental impact. In contrast, electrochemical oxidation is an environmentally friendly technique with low requirements for chemical use, produces little pollution, and has good prospects for application in sludge cell lysis [15].…”

Section: Introductionmentioning

confidence: 99%

Study on the Efficiency of On-Site Sludge Reduction Using Ti/SnO2-Sb and Ti/RuO2-IrO2 Electrodes Based on a Cell Lysis-Cryptic Growth System

Zhou

Wang

et al. 2021

Water

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The present study investigated the parameters and the mechanism of action of electrochemical cell lysis to reduce the return sludge from secondary settlers based on the theory of cell lysis-cryptic growth. The factors influencing the functioning of two electrodes (Ti/SnO2-Sb and Ti/RuO2-IrO2) were investigated to determine the optimal cell lysis parameters for each electrode, and the effects of the two electrodes on cell lysis were compared under these conditions. Finally, the Ti/SnO2-Sb electrode was selected for the subsequent experiments. The electrolysis reaction was performed using the following parameters: the initial sludge concentration was 7000 mg/L, the working voltage was 18 V, the plate spacing was 1 cm, the initial pH was 6.8 to 7.0, and the electrolysis duration was 90 min. The degree of disintegration of the sludge and the cell lysis rate reached 25.35% and 20.15%, respectively. In summary, electrochemical cell lysis has a good prospect for sludge reduction.

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Electrochemical treatment of sewage sludge and pathogen inactivation

Cited by 24 publications

References 39 publications

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Electrochemical valorization of waste activated sludge for short-chain fatty acids production

Study on the Efficiency of On-Site Sludge Reduction Using Ti/SnO2-Sb and Ti/RuO2-IrO2 Electrodes Based on a Cell Lysis-Cryptic Growth System

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