Effect of aeration modes on the characteristics of composting emissions and the NH3 removal efficiency by using biotrickling filter |
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Authors: | Wu Chuanfu Wang Qunhui Sun Xiaohong Xue Niantao Liu Shu Xie Weimin |
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Institution: | a Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology, Beijing 100083, 30 Xueyuan Road, Haidian District, Beijing, PR China b Beijing Agricultural Biotechnology Centre, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100089, PR China c Japan TOHIN Company Group Profile, 13 Kawarai, Kuki, Saitama, Tokyo 346-0028, Japan |
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Abstract: | A pilot biotrickling filter (BTF) packed with ZX02 fibrous balls as packing material was tested for the treatment of ammonia (NH3) released from a composting plant of dairy manure. In order to investigate the effects of three compost aeration modes (mode Co-I, Co-II and In-II) on the NH3 removal efficiency, a field experiment was continuously carried out for more than eight months. The results demonstrated that under the intermittent aeration mode (In-II), the NH3 removal efficiency reached 99.2 ± 0.1% when the inlet NH3 concentration was 7.5-32.3 mg m−3 (9.8-42.5 ppmv). The maximum and critical elimination capacity of the biotrickling filter was 22.6 and 4.9 g NH3 m−3 h−1, respectively. The effluent concentration of NH3 was lower than 1.0 mg m−3, which meets the first class discharge standards of GB14554-93. When the concentration of free ammonia in the trickling liquid was varied from 0.1 to 0.4 mg L−1, the nitrification yield was between 47.9% and 103.8%. In addition, the optimum liquid tricking velocity (LTV) of the biotrickling filter was 0.5 m3 m−2 h−1 for low inlet concentrations and 2.2 m3 m−2 h−1 for high inlet concentrations. Therefore, the use of the biotrickling filter for the compost under the third aeration mode (In-II) yielded an effective optimum NH3 removal and reduced the nitrogen loss in the compost. |
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