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| Effect of mature compost biofilter on removal efficiency of NH3 produced during composting |
| Received:August 06, 2015 |
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| KeyWord:biofiltration;mature compost;ammonia;bacteria;adsorption capacity;removal efficiency |
| Author Name | Affiliation | E-mail | | YUAN Jing | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | DU Long-long | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | ZHANG Zhi-ye | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | LI Guo-xue | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | ligx@cau.edu.cn | | ZHANG Di-fang | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | JIANG Tao | College of Chemistry, Leshan Normal University, Leshan 614004, China | | | YANG Qing-yuan | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | |
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| Abstract: |
| Biofiltration is an effective technique to mitigate gaseous emissions. Mature compost may absorb gases emitted from composting piles. Diverse bacteria acclimated in mature compost may also contribute to the mitigation of NH3 emissions. In this study, a quantitative contribution of adsorption capacity and microbial activity of biofilter to NH3 removal efficiencies was examined using a mature compost as biofiltration material. Results showed that the mature compost as a biofiltration material removed 100% NH3 via its high adsorption capacity and acclimated bacteria. Adsorption played the main role in NH3 removal, accounting for 75%~80% of total removal. Microbial activity in the mature compost contributed 10%~25%. Ammonia was adsorbed physically by the un-sterilized biofilter, and was then converted to NO3-N by nitrifying bacteria. Most NH3 was removed by the packing material at the bottom of biofilter. Cumulative NH3 emissions reduced gradually along with increasing biofilter thickness. The relationship between cumulative NH3 emission(y) and thickness of biofilter(x) was expressed as y=7 727.4e-0.266x for non-sterilized biofilter(R2=0.983 9) and y=4 060.6e-0.134x for sterilized biofilter(R2=0.991 5). In non-sterilized treatment, biofilter of 25 cm thick could remove NH3 completely, while in sterilized treatment, the biofilter thickness to remove NH3 was 50 cm. No acidification was detected in a mixture of mature compost and sand at 4:6 at the end 28 day experiment. The present study indicates that using mature compost as biofilter is a suitable approach to mitigating NH3 emissions during composting. |
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