Journal of Ecology and Rural Environment ›› 2022, Vol. 38 ›› Issue (9): 1211-1220.doi: 10.19741/j.issn.1673-4831.2021.0684

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Study on the Treatment Effect of NH3 and H2S in Chicken Coop by Biotrickling Filter Tower Based on Improved Structure

TONG Yi1,2, WEI Xiao-yu3, HUANG Shi-yu3, YANG Pan3, LIU Bo3, WANG Jin1, WANG Wen-lin2   

  1. 1. School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China;
    2. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 320102, China;
    3. School of Geographical Sciences, Nantong University, Nantong 226000, China
  • Received:2021-11-08 Online:2022-09-25 Published:2022-09-21

Abstract: A structure-improved biological filter tower (BFT) was designed to improve its NH3 and H2S removal efficiency, so as to avoid the secondary contaminant accumulation due to insufficient oxygen in the circulating liquid. The improved BFT can increase mass transfer efficiency and provide aeration for the circulating liquid. The results of the comparing study of the improved BFT and ordinary BFT show that the improved BFT has the following advantages:It brings high treatment efficiency under the condition of short residence time and low intake gas concentrations. Under short residence time (i. e. 10 s), the average efficiency of the improved BFT in removing NH3 and H2S was 86.90% and 80.79%, respectively, 10.52 and 10.68 percentage point higher than that of the ordinary one, respectively. Compared with the ordinary BFT, the improved BFT can achieve efficient treatment under the condition of lower residence time, resulting in smaller device size and lower construction and operation costs. Under low intake gas concentrations (i. e. NH3, 5×10-6; H2S, 1×10-6), the average efficiency of the improved BFT in removing NH3 and H2S was 93.98% and 87.73%, respectively, 10.74 and 17.47 percentage point higher than that of the ordinary one, respectively. Compared with the ordinary BFT, the improved BFT can realize the efficient treatment of a wider range of applicable concentration, and can be applied to different emission levels of chicken house. It brings high efficiency in removing the accumulated pollutants in circulating liquid. In the last period of the experiment, the concentration of NH4+ and NO2- in circulating liquid from the improved BFT was 5.77 and 1.99 mg·L-1, respectively, 70.81% and 76.49% lower than that in the circulating liquid from ordinary BFT. The concentration of the stable end-products, NO3- and SO42-(both not being indicators in the current national wastewater discharge standards for livestock farms), from the improved BFT, was 70.69 and 13.78 mg·L-1, respectively, 56.29% and 29.21% higher than that in the circulating liquid from the ordinary BFT.

Key words: livestock and poultry farm, chicken breeding, breeding house, biological filter, NH3, H2S

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