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Enhanced technology for sewage sludge advanced dewatering from an engineering practice perspective: A review
Xudong Zhang1, Peng Ye1, Yajun Wu1
1Department of Civil Engineering, Shanghai University, 99 Shangda Road, Shanghai, 200444, China.
Journal of Environmental Management
|August 19, 2022
Summary
Reducing sludge water content (WC) is key to lowering disposal costs. This study details preconditioning and mechanical dewatering methods to improve sludge dewaterability and reduce environmental risks.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
Background:
- Increasing sludge production presents significant environmental challenges and high disposal costs due to elevated water content (WC).
- The hydrophilic organic matter in sludge hinders efficient dewatering, necessitating advanced treatment strategies.
Purpose of the Study:
- To comprehensively review sludge preconditioning and mechanical dewatering techniques.
- To analyze the mechanisms, advantages, disadvantages, and cost-effectiveness of various sludge dewatering methods.
Main Methods:
- Detailed description of sludge characteristics and dewatering challenges.
- Exploration of physical, chemical, and biological preconditioning mechanisms.
- Introduction to mechanical dewatering principles and engineering applications, including vacuum preloading.
Main Results:
- Analysis of different preconditioning methods and their impact on sludge dewaterability.
- Evaluation of mechanical dewatering techniques, highlighting vacuum preloading for in-situ applications.
- Cost-benefit analysis of combined preconditioning and mechanical dewatering approaches.
Conclusions:
- Preconditioning and mechanical dewatering are crucial for advanced sludge treatment.
- Understanding the mechanisms and costs is vital for selecting feasible engineering applications.
- This review offers insights into optimizing sludge management through effective dewatering strategies.
