Comparison of methane production by co-digesting fruit and vegetable waste with first stage and second stage anaerobic digester sludge from a two stage digester

Fruit and vegetable waste (FVW) was co-digested with first stage (FSS) and second stage anaerobic digester sludge (SSS) separately, over the course of 10 days, in batch reactors. Addition of FVW significantly increased the methane production in both sludges. After 10 days of digestion FSS + FVW prod...

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Bibliographic Details
Published in:Water science and technology 2012-01, Vol.65 (7), p.1252-1257
Main Authors: Park, Nathan D, Thring, Ronald W, Helle, Steve S
Format: Article
Language:English
Subjects:
Anaerobiosis
Batch reactors
Biofuels - analysis
Biological Oxygen Demand Analysis
Bioreactors
Digesters
Digestion
Fruit - metabolism
Fruits
Garbage
Inoculum
Methane
Methane - analysis
Methane - metabolism
Methane generation
Refuse as fuel
Sewage
Sludge
Sludge digestion
Vegetables
Vegetables - metabolism
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Summary:Fruit and vegetable waste (FVW) was co-digested with first stage (FSS) and second stage anaerobic digester sludge (SSS) separately, over the course of 10 days, in batch reactors. Addition of FVW significantly increased the methane production in both sludges. After 10 days of digestion FSS + FVW produced 514 ± 57 L CH(4) kg VS(-1)(added) compared with 392 ± 16 L CH(4) for the SSS + FVW. The increased methane yield was most likely due to the higher inoculum substrate ratio of the FSS. The final VS and COD contents of the sewer sludge and FVW mixtures were not significantly different from the control values suggesting that all of the FVW added was degraded within 10 days. It is recommended that FVW be added to the first stage of the anaerobic digester in order to maximize methane generation.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2012.004