A comparative study on Mesophilic and thermophilic anaerobic digestion of different total solid content sludges produced in a long sludge-retention-time system

Miao Wang; Yi Wang; Jun Peng; Linping Wang; Jie Yang; Xiaomei Kou; Baohua Chai; Lijuan Gao; Xiaofeng Han

Results in Engineering (Sep 2023)

A comparative study on Mesophilic and thermophilic anaerobic digestion of different total solid content sludges produced in a long sludge-retention-time system

Miao Wang,
Yi Wang,
Jun Peng,
Linping Wang,
Jie Yang,
Xiaomei Kou,
Baohua Chai,
Lijuan Gao,
Xiaofeng Han

Affiliations

Miao Wang: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
Yi Wang: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Corresponding author. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, Shaanxi, China.
Jun Peng: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
Linping Wang: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
Jie Yang: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China
Xiaomei Kou: Power China-Northwest Engineering Corporation Limited, Xi'an, 710065, China
Baohua Chai: Power China-Northwest Engineering Corporation Limited, Xi'an, 710065, China
Lijuan Gao: Power China-Northwest Engineering Corporation Limited, Xi'an, 710065, China
Xiaofeng Han: Power China-Northwest Engineering Corporation Limited, Xi'an, 710065, China

Journal volume & issue: Vol. 19
p. 101228

Abstract

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Most waste sludge belongs to long sludge-retention-time (SRT) sludge in China, but its outlet is becoming a severe environmental problem nowadays. In this study, the characteristics of mesophilic and thermophilic anaerobic digestion of long SRT sludge was investigated under different total solid content (TSC) of 4%, 6%, and 8% in batch reactors. The results showed that the methane production potential (Po) and methane production rate (Rmax) of thermophilic anaerobic digestion (TAD) were increased by about 60% and 200% compared with that of the mesophilic anaerobic digestion (MAD) at 4% TSC. In TAD groups, the Po of 240.95 LCH4 kgVS-1added and Rmax of 22.17 LCH4 kgVS-1added day-1 were achieved in the reactor of 4% TSC while the inhibition concentration of propionate and free ammonia reached 1022 mg L-1 and 603 mg L-1 in the reactor of 8% TSC. Although the diversity of microbial communities were poor in TAD, Coprothermobacter was enriched in TAD, which could degrade protein efficiently. In addition, the dewaterability of digested sludge in TAD was poorer than that in MAD, and both got worse with the increased TSC. Therefore, it is appropriate for the long SRT sludge to anaerobic digestion under thermophilic condition and lower TSC. So, thermophilic anaerobic digestion with lower TSC might be an alternative approach for the treatment and resource utilization of long SRT sludge.

Published in Results in Engineering

ISSN: 2590-1230 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology
Website: https://www.journals.elsevier.com/results-in-engineering

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