Microbial-growth inhibition during composting of food waste: Effects of organic acids

Microbial-growth inhibition during composting of food waste: Effects of organic acids

Factorial designs were employed to analyze the inhibitory effects of acetic, butyric, lactic, and propionic acids on composting microorganisms. Compost samples were withdrawn on different days of composting and treated with acids alone and in combination (at 0 and 0.5mmol/g). Microorganisms were enu...

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Bibliographic Details
Published in:Bioresource technology Vol. 101; no. 15; pp. 5925 - 5934
Main Authors: Cheung, H.N.B., Huang, G.H., Yu, H.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01-08-2010
[New York, NY]: Elsevier Ltd
Elsevier
Subjects:
Acids - chemistry
Bacterial Physiological Phenomena
Biological and medical sciences
Biological treatment of sewage sludges and wastes
Biotechnology
Cell Proliferation
Environment and pollution
Factorial designs
Food industries
Food Microbiology
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
Industrial Waste - prevention & control
Mesophilic
Microorganisms
Organic acids
Organic Chemicals - chemistry
Refuse Disposal - methods
Soil - analysis
Soil Microbiology
Thermophilic
Use and upgrading of agricultural and food by-products. Biotechnology
Mesophilic
Microorganisms
Factorial designs
Thermophilic
Organic acids
Growth inhibitor
Microorganism growth
Growth
Thermophily
Food waste
Composting
Mesophily
Inhibition
Microorganism
Factorial design
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Summary:Factorial designs were employed to analyze the inhibitory effects of acetic, butyric, lactic, and propionic acids on composting microorganisms. Compost samples were withdrawn on different days of composting and treated with acids alone and in combination (at 0 and 0.5mmol/g). Microorganisms were enumerated to determine degree of growth inhibition. Generally, inhibition was more severe on the day when pH decreased rather than on the day when pH started to increase. Butyric or lactic acid alone, and the combination of butyric, lactic, and propionic acids, significantly inhibited thermophilic bacteria. Only 51.0–65.0% of the thermophilic bacteria exist if 0.5mmol/g of these acids were present in compost. Temperature, microbial populations, and microbial growth phase might cause variation in the inhibitory effects of acids. These findings are useful not only in the study of microorganisms in acidic microenvironments, but also in preventing microbial-growth inhibition by predicting population via a regression model.
Bibliography:http://dx.doi.org/10.1016/j.biortech.2010.02.062
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2010.02.062