Document Detail


Influences of volatile solid concentration, temperature and solid retention time for the hydrolysis of waste activated sludge to recover volatile fatty acids.
MedLine Citation:
PMID:  22750494     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The study evaluated influences of sludge concentration, temperature and solids retention time (SRT) for the hydrolysis of waste activated sludge (WAS) in anaerobic digesters. The results indicated that volatile fatty acids (VFA) production increased when the concentration of mixed liquor volatile suspended solids (MLVSS) was higher. When SRT was 48h, VFA concentration increased 8.43times from 4.57 to 23.78gMLVSS/L. VFA generation was significantly affected with different temperature and SRT. When the temperature changed from 40 to 50°C, it induced 1.65-fold increase in VFA yield. The optimal SRT was 48h. As VFA concentration decreased only 1.31times compared with maximum VFA production at SRT of 120h. Iso-valeric acid, acetic acid and n-butyric acid were the dominant VFA produced and would improve ployhydroxyvalerate proportion in polymer. The feasibility of nitrogen and phosphorus recovery and the risk of metal ion released depended on the nature of WAS.
Authors:
Huilei Xiong; Jinluan Chen; Hui Wang; Hanchang Shi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-9
Journal Detail:
Title:  Bioresource technology     Volume:  119C     ISSN:  1873-2976     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-7-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9889523     Medline TA:  Bioresour Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  285-292     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Affiliation:
School of Environment, Tsinghua University, Beijing 100084, China.
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