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Reducing H2S production by O2 feedback control during large-scale sewage sludge composting
Jun Chen1, Tong-Bin Chen, Ding Gao
1Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A Datun Road, Beijing 100101, China.
Waste Management (New York, N.Y.)
|October 8, 2010
Summary
Hydrogen sulfide (H2S) production during composting is highest in the first 40 hours due to low oxygen (O2). Maintaining O2 above 14% effectively reduces H2S emissions.
Area of Science:
- Environmental Science
- Waste Management
- Biotechnology
Background:
- Hydrogen sulfide (H2S) is a malodorous and corrosive gas commonly produced during organic waste decomposition.
- Understanding H2S production dynamics is crucial for optimizing composting processes and mitigating environmental impacts.
Purpose of the Study:
- To investigate the patterns of hydrogen sulfide (H2S) production during sewage sludge composting.
- To determine the influence of oxygen (O2) concentration on H2S generation.
- To identify effective strategies for controlling H2S emissions in composting.
Main Methods:
- Real-time, online multi-gas detection system used to monitor H2S and O2 concentrations in a composting pile.
- Field study conducted at an operational composting plant.
Main Results:
- H2S production was predominantly observed during the initial composting phase, particularly within the first 40 hours.
- A significant correlation was found between low oxygen availability and increased H2S production.
- Maintaining O2 concentrations above 14% in the compost pile was shown to significantly reduce H2S generation.
Conclusions:
- Lack of sufficient oxygen is the primary driver for H2S production in sewage sludge composting.
- Strategies such as increasing aeration frequency or continuous aeration to maintain high O2 levels are effective in controlling H2S emissions.
- Optimizing aeration is key to mitigating H2S pollution during composting operations.
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