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Updated: Jan 27, 2026
15:19
Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
10.1K
Study on the effect of chitosan conditioning on sludge dewatering
1School of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
Summary
Chitosan (CTS) effectively improves sewage sludge dehydration, significantly reducing moisture content and sludge volume. This wastewater treatment advancement enhances sludge sedimentation and disposal processes.
Area of Science:
- Environmental Science
- Chemical Engineering
- Water Treatment Technology
Background:
- Residual sludge dehydration poses a significant challenge in sewage treatment operations.
- Reducing sludge moisture content is crucial for minimizing sludge volume and facilitating subsequent disposal.
- Chitosan (CTS), an organic polymer flocculant, is recognized for its applications in water and wastewater treatment.
Purpose of the Study:
- To investigate the efficacy of chitosan (CTS) in enhancing the sedimentation and dehydration properties of sewage sludge.
- To quantify the impact of CTS treatment on sludge moisture content, volume, and dewatering characteristics.
Main Methods:
- Application of chitosan (CTS) as a treatment agent for sewage sludge.
- Measurement of sludge cake moisture content, SV30 (settled volume after 30 minutes), and overall sludge volume.
- Analysis of sludge zeta potential (ζ-potential), particle size distribution (D50), extracellular polymeric substances (EPS), and soluble chemical oxygen demand (SCOD).
Main Results:
- CTS treatment reduced sludge cake moisture content from 85.9% to 83.0% and decreased SV30 by approximately 50%.
- Sludge volume was significantly reduced to 82.9% of the original volume following CTS treatment.
- Zeta potential shifted from negative to positive, D50 increased, and peak EPS/SCOD concentrations correlated with lowest moisture content.
Conclusions:
- Chitosan (CTS) effectively improves sludge dewatering and sedimentation performance.
- Mechanisms include electrical neutralization, adsorption bridging, and dissolution of extracellular polymeric substances (EPS).
- CTS offers a viable solution for enhancing sludge management in wastewater treatment.
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