Reasons for Ineffectiveness in Improving Dewaterability of Anaerobically Digested Sludge by Bioleaching-Reference-Cited by-同舟云学术

Reasons for Ineffectiveness in Improving Dewaterability of Anaerobically Digested Sludge by Bioleaching

Published:2023-03-08 Issue:6 Volume:15 Page:4789
ISSN:2071-1050
Container-title:Sustainability
language:en
Short-container-title:Sustainability

Author:

Zhang Haochi¹,Zhang Dejin¹,Zhou Yujun²^ORCID,Fang Di¹,Cui Chunhong¹,Liang Jianru¹,Zhou Bo¹,Zhang Mingjiang¹,Li Jiansheng²,Zhou Lixiang¹³

Affiliation:

1. Department of Environmental Engineering, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China

2. Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

3. Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China

Abstract

The use of bioleaching for anaerobically digested sludge (ADS) was found to be ineffective compared to using it for undigested sludge (UDS) for reasons elucidated in this study. Results showed that specific resistance to filtration of ADS increased during bioleaching. The pH value of ADS increased to 7.97 and remained unchanged during bioleaching, while it decreased to 2.98 for UDS. Added Fe2+ was not detected as the energy source for ADS. Higher alkalinity and unavailable Fe2+ in ADS prevented the growth of the Acidithiobacillus species. It was found that sludge pH increased to 8.40 and then stayed within an alkaline range, whereas slime EPS content rapidly increased to 8.13 mg DOC/g VSS. These results indicated that aeration seriously deteriorated the dewaterability of ADS through bioleaching due to the unexpected drastic increase of sludge pH and slime EPS content.

Funder

Science and Technology Innovation Project on Emission Peak and Carbon Neutrality of Jiangsu Province

Publisher

MDPI AG

Subject

Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment,Geography, Planning and Development,Building and Construction

Link

https://www.mdpi.com/2071-1050/15/6/4789/pdf

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