Improvement of sewage sludge dewaterability by bioleaching in a continuous plug flow bioreactor: optimization of process parameters-Reference-Cited by-同舟云学术

Improvement of sewage sludge dewaterability by bioleaching in a continuous plug flow bioreactor: optimization of process parameters

Published:2018-03-15 Issue:8 Volume:77 Page:1979-1989
ISSN:0273-1223
Container-title:Water Science and Technology
language:en
Short-container-title:

Author:

Gao Jingqing¹,Ma Na²,Li Linshuai³,Zhu Songfeng³,Li Yonghong⁴,Chen Jie⁵,Chen Yong⁶

Affiliation:

1. School of Water Conservancy and Environment, Zhengzhou University, Zhengzhou 450001, China

2. Research Institute of Environmental Sciences, College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, China

3. Zhengzhou University Multi-Functional Design and Research Academy Co., Ltd, Zhengzhou 450001, China

4. School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, China

5. Zhengzhou University Library, Zhengzhou University, Zhengzhou 450001, China

6. College of Resources and Environment, Henan Institute of Engineering, Zhengzhou 451191, China

Abstract

Abstract A novel process for sewage sludge bioleaching by mixed Thiobacilli (Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans) using a 12-stage, 180 L working volume continuous plug-flow bioreactor, is presented. The objective of the present study was to assess the impact of some parameters on the sludge dewaterability and to improve the sludge dewaterability by optimization of these parameters. The parameters examined were sludge moisture content, nutrients dosage, aeration rate, and the number of reactors. The order of the influence of these factors on sludge dewaterability was found to be sludge moisture content > nutrients dosage > aeration rate > number of reactors. The optimized conditions were: sludge moisture content, 98.0%, nutrients dosage, 9 g/L, aeration rate, 8 m3/h, and 10 reactors. Confirmation experiments conducted under optimum conditions demonstrate the sludge dewaterability to be remarkably improved. After 2 days of bioleaching, the moisture of bioleached sludge cake was reduced to below 60%.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

Link

http://iwaponline.com/wst/article-pdf/77/8/1979/214676/wst077081979.pdf

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