Efficiency of a two-stage cascade sequencing batch reactor in treating coking wastewater

WANG Chen; WEN Qinxue; CHEN Chuan; CHEN Zhiqiang

doi:10.13205/j.hjgc.202512011

Volume 43 Issue 12

Dec. 2025

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WANG Chen, WEN Qinxue, CHEN Chuan, CHEN Zhiqiang. Efficiency of a two-stage cascade sequencing batch reactor in treating coking wastewater[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(12): 92-101. doi: 10.13205/j.hjgc.202512011

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WANG Chen, WEN Qinxue, CHEN Chuan, CHEN Zhiqiang. Efficiency of a two-stage cascade sequencing batch reactor in treating coking wastewater[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(12): 92-101. doi: 10.13205/j.hjgc.202512011

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Efficiency of a two-stage cascade sequencing batch reactor in treating coking wastewater

doi: 10.13205/j.hjgc.202512011

1. State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China

Received Date: 2024-11-12
Accepted Date: 2025-01-10
Rev Recd Date: 2024-12-25

Available Online: 2026-01-09

Abstract

Abstract

In response to the problems of unstable treatment effects on chemical oxygen demand （COD） and nitrogen-containing pollutants in water， and poor activity of functional bacterial communities in existing coking wastewater treatment processes， this paper explored the treatment efficiency and related pollutants’ degradation laws of a two-stage cascade sequencing batch reactor for coking wastewater treatment. The results showed that the removal rates of COD， ammonia nitrogen， and volatile phenols by the two-stage series sequencing batch reactor were relatively stable at 88.33%， 89.29%， and 92.86% after the first stage treatment， and at 95.83%， 96.43%， and 98.57% after the second stage treatment. The primary removal rates of COD， ammonia nitrogen， volatile phenols， and pyridine， quinoline， and indole in nitrogen heterocyclic organic compounds in coking wastewater were 48.3%， 87.13%， and 100%， respectively， and the secondary removal rates were 91.09%， 91.82%， and 100%， respectively； acute biological toxicity was reduced by more than 98%. Most pollutants were degraded in the aerobic stage of primary treatment， and residual pollutants can be further removed in subsequent stages. The microbial community that had been selectively domesticated through changes in pollutants’ gradient concentration showed a good tolerance to the main pollutants’ species in wastewater， and the abundance of related functional microbial communities was relatively high， mostly facultative bacteria. This research proued that a two-stage series sequencing batch reactor can achieve efficient and stable treatment of coking wastewater.
- two-stage cascade sequencing batch reactor,
- coking wastewater,
- biological toxicity,
- microbial community

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References(22)

References

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