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Open AccessArticle

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

1
Shenzhen Engineering Laboratory of Microalgal Bioenergy, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
2
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
3
School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
*
Authors to whom correspondence should be addressed.
Academic Editor: Antonio Zuorro
Water 2021, 13(7), 941; https://doi.org/10.3390/w13070941
Received: 28 January 2021 / Revised: 26 March 2021 / Accepted: 27 March 2021 / Published: 30 March 2021
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. View Full-Text
Keywords: electrochemical oxidation; electrochemical-A/O combined process; Ti/SnO2-Sb; sludge reduction; cell lysis rate electrochemical oxidation; electrochemical-A/O combined process; Ti/SnO2-Sb; sludge reduction; cell lysis rate
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MDPI and ACS Style

He, Z.; Han, W.; Zhou, X.; Jin, W.; Liu, W.; Gao, S.; Zhao, Z.; Chen, Y.; Jiang, G. Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process. Water 2021, 13, 941. https://doi.org/10.3390/w13070941

AMA Style

He Z, Han W, Zhou X, Jin W, Liu W, Gao S, Zhao Z, Chen Y, Jiang G. Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process. Water. 2021; 13(7):941. https://doi.org/10.3390/w13070941

Chicago/Turabian Style

He, Zhongqi; Han, Wei; Zhou, Xu; Jin, Wenbiao; Liu, Wentao; Gao, Shuhong; Zhao, Zhicheng; Chen, Yidi; Jiang, Guangming. 2021. "Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process" Water 13, no. 7: 941. https://doi.org/10.3390/w13070941

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