High inorganic suspended solids (ISS) content of sludge in many areas (especially with combined sewage systems) results in low VS/TS (volatile solids, VS; total solids, TS) levels and raises concerns about its effect on anaerobic digestion. The performances of sludge anaerobic digestion with different feeding VS/TS levels as well as the effect of ISS content on the anaerobic degradation process were investigated in completely stirred tank reactors by semi-continuous and batch experiments. In semi-continuous experiment with sludge at VS/TS of 61.4%, 45.0, 30.0% and 15.0%, biogas yield, VS reduction and methane content decreased logarithmically with the feeding VS/TS decreasing; slightly higher volatile fatty acid concentration was observed at VS/TS 15%. Results of the batch experiments suggested that acetogenesis and methanogenesis are obviously affected by high ISS addition, while hydrolysis is less affected. The retardment of substrate conversion rate is probably attributed to decreased mass transfer efficiency at high ISS content.
Skip Nav Destination
Article navigation
Research Article|
August 22 2016
Anaerobic digestion of sludge differing in inorganic solids content: performance comparison and the effect of inorganic suspended solids content on degradation
Nina Duan;
Nina Duan
1Post-Doctoral Research Center for Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
Search for other works by this author on:
Xiaohu Dai;
2National Engineering Research Center for Urban Pollution Control, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
E-mail: daixh_ss@163.com
Search for other works by this author on:
Bin Dong;
Bin Dong
2National Engineering Research Center for Urban Pollution Control, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
Search for other works by this author on:
Lingling Dai
Lingling Dai
2National Engineering Research Center for Urban Pollution Control, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
Search for other works by this author on:
Water Sci Technol (2016) 74 (9): 2152–2161.
Article history
Received:
June 21 2016
Accepted:
August 10 2016
Citation
Nina Duan, Xiaohu Dai, Bin Dong, Lingling Dai; Anaerobic digestion of sludge differing in inorganic solids content: performance comparison and the effect of inorganic suspended solids content on degradation. Water Sci Technol 14 November 2016; 74 (9): 2152–2161. doi: https://doi.org/10.2166/wst.2016.400
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
Impact Factor 2.430
CiteScore 3.4 • Q2
13 days submission to first
decision
1,439,880 downloads in 2021