Document Detail

Effect of enzymatic pretreatment on solubilization and volatile fatty acid production in fermentation of food waste.
MedLine Citation:
PMID:  16459776     Owner:  NLM     Status:  MEDLINE    
Food waste can be a valuable carbon source in biological nutrient removal (BNR) systems because of the high C/N and C/P ratio. However, pretreatment is necessary to promote hydrolysis of food waste because of the high concentration of volatile solids associated with organic matter. The influence of the enzymatic pretreatment on acid fermentation of food waste was investigated in this study. Solubilization of particulate matter in food waste was carried out using commercial enzymes. The acidification efficiency and the volatile fatty acid (VFA) production potential of enzymatically pretreated food waste were examined. The highest volatile suspended solid (VSS) reduction was obtained with an enzyme mixture ratio of 1:2:1 for carbohydrase: protease: lipase. An optimum enzyme dosage for solubilization of food waste was 0.1% (V/V) with the enzyme mixture ratio of 1:2:1. In the acid fermentation of enzymatically pretreated food waste, the maximum VFA production and the highest VFA fraction in soluble COD (SCOD) were also achieved at 0.1% (V/N) of total enzyme dosage. Increase in VFA production at this level of enzyme dosage was over 300% compared with the control fermenter. The major form of VFA produced by fermentation was n-butyrate followed by acetate.
H J Kim; Y G Choi; G D Kim; S H Kim; T H Chung
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Water science and technology : a journal of the International Association on Water Pollution Research     Volume:  52     ISSN:  0273-1223     ISO Abbreviation:  Water Sci. Technol.     Publication Date:  2005  
Date Detail:
Created Date:  2006-02-07     Completed Date:  2006-05-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9879497     Medline TA:  Water Sci Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  51-9     Citation Subset:  IM    
School of Civil, Urban and Geosystem Engineering, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, 151-742, Seoul, South Korea.
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MeSH Terms
Acetates / metabolism
Butyrates / metabolism
Enzymes / metabolism*
Fatty Acids, Volatile / metabolism*
Glycoside Hydrolases / metabolism
Industrial Waste
Lipase / metabolism
Peptide Hydrolases / metabolism
Sewage / chemistry,  microbiology*
Time Factors
Waste Disposal, Fluid / methods*
Reg. No./Substance:
0/Acetates; 0/Butyrates; 0/Enzymes; 0/Fatty Acids, Volatile; 0/Industrial Waste; 0/Sewage; EC; EC 3.2.1.-/Glycoside Hydrolases; EC 3.2.1.-/carbohydrase; EC 3.4.-/Peptide Hydrolases

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