Document Detail

Enhanced methane production from anaerobic digestion of disintegrated and deproteinized excess sludge.
MedLine Citation:
PMID:  16614889     Owner:  NLM     Status:  MEDLINE    
To improve biogas yield and methane content in anaerobic digestion of excess sludge from the wastewater treatment plant, the sludge was disintegrated by using various methods (sonication, alkaline and thermal treatments). Since disintegrated sludge contains a high concentration of soluble proteins, the resulting metabolite, ammonia, may inhibit methane generation. Therefore, the effects of protein removal from disintegrated sludge on methane production were also studied. As a result, an obvious enhancement of biogas generation was observed by digesting disintegrated sludge (biogas yield increased from 15 to 36 ml/g COD(added).day for the raw excess sludge and the sonicated sludge, respectively). The quality of biogas was also improved by removing proteins from the disintegrated sludge. About 50% (w/w) of soluble proteins were removed from the suspension of disintegrated sludge by salting out using 35 g MgCl(2) x 6H(2)O/l and also by isoelectric point precipitation at pH 3.3. For deproteinized sludge, methane production increased by 19%, and its yield increased from 145 ml/g COD(removed) to 325 ml/g COD(removed). Therefore, the yield and quality of biogas produced from digestion of excess sludge can be enhanced by disintegrating the sludge and subsequent protein removal.
Rong Cui; Deokjin Jahng
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biotechnology letters     Volume:  28     ISSN:  0141-5492     ISO Abbreviation:  Biotechnol. Lett.     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-04-14     Completed Date:  2006-11-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8008051     Medline TA:  Biotechnol Lett     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  531-8     Citation Subset:  IM    
Department of Environmental Engineering and Biotechnology, Myongji University, 449-728, Yongin, Kyunggido, Republic of Korea.
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MeSH Terms
Bacteria, Anaerobic / metabolism*
Biodegradation, Environmental
Hydrogen-Ion Concentration
Methane / biosynthesis*
Proteins / isolation & purification
Sewage / chemistry*,  microbiology
Time Factors
Waste Management / methods
Reg. No./Substance:
0/Proteins; 0/Sewage; 74-82-8/Methane

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