Effect of Chemical Conditioning of Sewage Sludge on Dewatering Performance and Structural Components

Tian Wan, Chuanrui Li, Xiaokang Ju, Xingxing Yan, Min Wang, Jiehui Ren, Wen Cheng

2021

Abstract

Chemical conditioning is a commonly used sewage sludge pretreatment method of dewatering in wastewater treatment plants. As a result of a large number of chemicals used, the cost of sewage treatment plants increased, and negative environmental impact might be happened. Therefore, it is necessary to illustrate the dewatering performance and structural components during chemical conditioning, in order to control the dosage of chemicals. In this paper, the excess sludge was treated by cationic polyacrylamide (CPAM). The physical and chemical properties of excess sludge were analyzed. The moisture content of sludge filter cake, the change of moisture distribution, the specific resistance of filtration, and capillary suction time (CST) of sludge were used as dewaterability parameters. The Zeta potential and particle size of sludge were measured, and the change of fractal dimension was analyzed. The changes of protein and polysaccharide content in extracellular polymeric substances (EPS) during conditioning were explored. Results showed that with the optimal CPAM dosage of 0.225 g/L, the moisture content of sludge cake reached 70.19 %, the specific resistance of sludge was 0.15×1012 m/kg, and CST was 6.45s. After conditioning, the Zeta negative electricity decreased, the particle size increased, the fractal dimension increased, and the contents of protein and polysaccharide in EPS increased. Tight EPS (TB-EPS) was released to loosen EPS (LB-EPS) and dissolved EPS (S-EPS), indicating that cationic polyacrylamide (CPAM) can effectively improve the dewatering performance of sludge.

Paper Citation

in Harvard Style

Wan T., Li C., Ju X., Yan X., Wang M., Ren J. and Cheng W. (2021). Effect of Chemical Conditioning of Sewage Sludge on Dewatering Performance and Structural Components. In Proceedings of the 7th International Conference on Water Resource and Environment - Volume 1: WRE, ISBN 978-989-758-560-9, pages 440-448

in Bibtex Style

@conference{wre21,
author={Tian Wan and Chuanrui Li and Xiaokang Ju and Xingxing Yan and Min Wang and Jiehui Ren and Wen Cheng},
title={Effect of Chemical Conditioning of Sewage Sludge on Dewatering Performance and Structural Components},
booktitle={Proceedings of the 7th International Conference on Water Resource and Environment - Volume 1: WRE,},
year={2021},
pages={440-448},
publisher={SciTePress},
organization={INSTICC},
doi={},
isbn={978-989-758-560-9},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 7th International Conference on Water Resource and Environment - Volume 1: WRE,
TI - Effect of Chemical Conditioning of Sewage Sludge on Dewatering Performance and Structural Components
SN - 978-989-758-560-9
AU - Wan T.
AU - Li C.
AU - Ju X.
AU - Yan X.
AU - Wang M.
AU - Ren J.
AU - Cheng W.
PY - 2021
SP - 440
EP - 448
DO -