Optimization of magnetic coagulation process for overflow pollution control

SUN Zhuyu; CUI Bingjie; CAI Yuyao; ZHANG Ying; WANG Pan

doi:10.13205/j.hjgc.202501016

Volume 43 Issue 1

Mar. 2025

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SUN Zhuyu, CUI Bingjie, CAI Yuyao, ZHANG Ying, WANG Pan. Optimization of magnetic coagulation process for overflow pollution control[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 144-154. doi: 10.13205/j.hjgc.202501016

Citation:

SUN Zhuyu, CUI Bingjie, CAI Yuyao, ZHANG Ying, WANG Pan. Optimization of magnetic coagulation process for overflow pollution control[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 144-154. doi: 10.13205/j.hjgc.202501016

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Optimization of magnetic coagulation process for overflow pollution control

doi: 10.13205/j.hjgc.202501016

1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;
2. Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China

Received Date: 2023-06-07
Accepted Date: 2023-10-20
Rev Recd Date: 2023-09-21

Available Online: 2025-03-21

Publish Date: 2025-03-21

Abstract

Abstract

In recent years, overflow pollution from municipal drainage systems has become a critical issue that affects the improvement of the urban water environment in many Chinese cities. The causes of overflow pollution are complex, with the main sources including combined sewer overflows, diverted sewage connections, stormwater runoff pollution, and pipe network sediments. In order to ameliorate the overflow pollution problem within a short period, the use of rainwater storage facilities in conjunction with in-situ purification at pumping stations is a feasible means. This study explored the feasibility of the magnetic coagulation process for overflow pollution reduction and carried out the optimization of process parameters. The results showed that the optimum magnetic coagulation conditions were: coagulant polyaluminum chloride (PAC), coagulation aid polyacrylic amide (PAM), and magnetic powder with dosages of 100, 1.00 and 100 mg/L, respectively; with the size of magnetic powder at 300 mesh and the optimum dosing order of magnetic powder-PAC-PAM. Under the optimum conditions, the average concentrations of COD and TP in the effluent of overflow wastewater after magnetic coagulation treatment were 12±8.83 and 0.03±0.03 mg/L, complying with China’s Surface Water Quality Standard: Class Ⅲ. Meanwhile, it was found that there was a significant positive correlation between the removal of COD, turbidity, SS and TP, where a high SS contribution can be a representative indicator. Therefore, the empirical equation for adjusting the dosage of chemicals was established based on the variation of SS concentration in the influent, which can cope with the complex and variable influent water quality in practical applications. This study can provide a reference for in-situ purification of overflow pollution.
- drainage system,
- overflow pollution,
- in-situ treatment,
- magnetic coagulation,
- pollution reduction

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References(22)

References

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