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Published on: May 6, 2010
Comparison of using animal manure and sludge compost as biofilter filling material for off-gas control in aerobic
Bin Shang1, Kaifeng Zhang2, Zhiqiang Chen2
1State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China; Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Key Laboratory of Energy Conservation and Waste Management in Agricultural Structures, Ministry of Agriculture and Rural Affairs, Beijing 100081, China.
Abstract:
Biofiltration is an important method for composting off-gas treatment. Compost-based materials are widely used as the filling media for biofilter. To expand the application of compost from different composting materials in off-gas control for organic waste aerobic composting, the NH3 removal efficiency, N2O generation, and microbial communities of ammonia monooxygenase (amoA functional gene was selected) and nitrite reductase (nirS functional gene was selected) were investigated using the animal manure compost (AMC) and sludge compost (SC) as filling materials. AMC showed a higher NH3 removal efficiency (average 82.9 ± 12.1 %) than SC (average 58.9 ± 21.9 %). Achieving stable NH3 removal took longer with the AMC biofilter than with the SC biofilter. More N2O was emitted from the AMC than from the SC. The ammonia-oxidizing bacteria (AOB) community composition in the AMC changed significantly after 30 days, whereas the denitrifying bacterial communities changed minimally. The AOB community structure in the SC was more stable than that in the AMC; however, the community compositions in the AMC and SC gradually converged with the extension of operation. These results indicate that the AMC is more suitable than the SC as biofilter filling material for NH3 control. This study provides a significant reference for optimizing the application of compost-based biofilter off-gas control technology.
