Research progress of component separation technology of sewer sludge in urban drainage network

PANG Heliang; DING Jiangbo; WANG Yan; LIU Jiawei; QIN Qiwen; ZHANG Ruiyang; XU Bing; DU Juanjuan; ZHANG Bo; LU Jinsuo

doi:10.13205/j.hjgc.202501010

Volume 43 Issue 1

Mar. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(1): 89-96

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PANG Heliang, DING Jiangbo, WANG Yan, LIU Jiawei, QIN Qiwen, ZHANG Ruiyang, XU Bing, DU Juanjuan, ZHANG Bo, LU Jinsuo. Research progress of component separation technology of sewer sludge in urban drainage network[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 89-96. doi: 10.13205/j.hjgc.202501010

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Research progress of component separation technology of sewer sludge in urban drainage network

doi: 10.13205/j.hjgc.202501010

1. College of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. State Key Laboratory of Pollution Control and Resource Reuse, Shanghai 200092, China;
3. SCEGC No. 12 Construction Engineering Group Co., Ltd., Ankang National High-Tech Industries Development Zone, Ankang 725000, China;
4. Xi'an Water (Group) Planning and Design Institute Co., Ltd., Xi'an 710000, China

Received Date: 2024-06-28
Accepted Date: 2024-09-09
Rev Recd Date: 2024-08-31

Available Online: 2025-03-21

Publish Date: 2025-03-21

Abstract

Abstract

The safe operation and maintenance of urban drainage networks, especially the proper disposal of sewer sediment, has become an urgent challenge as urbanization accelerates and wastewater treatment processes generate increasing amounts of sediment. In response, the Technical Regulations for the Treatment and Disposal of Sewer Sludge in Urban Drainage Systems, released in 2022, mandates that the organic component of sewer sediment must be reduced to 5% below, before it can be safely landfilled or reused as building materials. This requirement depends on the effective separation of organic and inorganic sewer sediment components, a complex process that has not been deeply studied. Traditional treatment methods, such as multi-stage hydraulic panning, rely on hydraulic forces and material concentration differences to separate the components. However, the methods are inefficient and consume numerous water resources. In contrast, newer technologies, alkaline hydrolysis, thermal hydrolysis, and CER (cation exchange resin), offer promising solutions to improve the separation efficiency. These methods aim to break down biopolymers directly or disrupt ion bridges through CER, thereby promoting the decomposition of sediment. Direct cracking methods focus on the breaking of biopolymers. While indirect approaches, CER, focus on breaking down the bonds that hold the components together. Although the number of research on CER treatment remains limited, it offers a more sustainable solution than traditional methods. This review explored the composition and environmental hazards of sewer sediment, emphasizing the importance of effective separation of organic and inorganic components. The current status of traditional hydraulic panning, typical hydrolysis methods, and CER technology were studied. By comparing the efficiency and mechanisms of those methods, the review evaluated the advantages and disadvantages from the perspective of engineering implementation, environmental impact, and economic benefits. The findings suggested that CER treatment, with high separation efficiency and sustainability, holds great potential in future sewer sediment management. Overall, this review provides both theoretical insights and practical guidance for advancing the understanding of organic/inorganic component separation in sewer sediment and encourages the development of efficient treatment technologies. A new recycling method of CER is also proposed to increase the economic and environmental benefits of sediment treatment.
- sewer sludge,
- component separation,
- hydraulic panning,
- polymer hydrolysis,
- ion exchange,
- crosslinking

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References

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