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Removal of high concentrations of NH3 by a combined photoreactor and biotrickling filter system
Average emission levels as high as 800 ppmv NH3 have often been found during the anaerobic fermentation process. At these levels, NH3 is regarded as an environmental toxic compound. High concentrations of NH3 gas are difficult to treat in a single treatment process, suggesting that, in terms of economic cost and treatment performance, a coupled system may be a feasible technological alternative. In the coupled TiO2 photocatalytic–biological treatment system evaluated here, the optimal gas retention time for NH3 removal – in terms of removal efficiency and capital cost – was 26 s. High gas temperatures, high NH3 concentrations, and low oxygen contents were unfavorable conditions for NH3 removal by the photoreactor. The coupled system successfully removed concentrated NH3 gas (R % > 97 %) under disrupted and shutdown conditions. The photoreactor component of the system successfully fulfilled its role as a pretreatment process and enhanced the performance of the biotrickling filter at a high inlet NH3 load (2,277 g-N m−3 day−1). Potential ammonia-oxidizing bacteria, including Bacillus cereus, Pseudomonas aeruginosa, and Stenotrophomonas sp., were isolated under the high inlet NH3 load condition. These microbial strains have a potential as biological agents in the removal of high concentrations of NH3 in waste gas or wastewater.
Removal of high concentrations of NH3 by a combined photoreactor and biotrickling filter system
Average emission levels as high as 800 ppmv NH3 have often been found during the anaerobic fermentation process. At these levels, NH3 is regarded as an environmental toxic compound. High concentrations of NH3 gas are difficult to treat in a single treatment process, suggesting that, in terms of economic cost and treatment performance, a coupled system may be a feasible technological alternative. In the coupled TiO2 photocatalytic–biological treatment system evaluated here, the optimal gas retention time for NH3 removal – in terms of removal efficiency and capital cost – was 26 s. High gas temperatures, high NH3 concentrations, and low oxygen contents were unfavorable conditions for NH3 removal by the photoreactor. The coupled system successfully removed concentrated NH3 gas (R % > 97 %) under disrupted and shutdown conditions. The photoreactor component of the system successfully fulfilled its role as a pretreatment process and enhanced the performance of the biotrickling filter at a high inlet NH3 load (2,277 g-N m−3 day−1). Potential ammonia-oxidizing bacteria, including Bacillus cereus, Pseudomonas aeruginosa, and Stenotrophomonas sp., were isolated under the high inlet NH3 load condition. These microbial strains have a potential as biological agents in the removal of high concentrations of NH3 in waste gas or wastewater.
Removal of high concentrations of NH3 by a combined photoreactor and biotrickling filter system
Wu, Li-Chun (author) / Kuo, Cheng-Lang (author) / Chung, Ying-Chien (author)
Journal of Environmental Science and Health, Part A ; 46 ; 1675-1682
2011-12-01
8 pages
Article (Journal)
Electronic Resource
Unknown
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