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- Title
Degradation Characteristics and Microbial Community of Phosphine Biopurification Systems.
- Authors
Liu, Shugen; Zheng, Hongyu; Li, Ting
- Abstract
Biological technology has presented a promising application for phosphine (PH3) purification; however, the degradation characteristics and microbial community of PH3 biopurification systems have rarely been reported. This study introduced an activated sludge process to treat PH3 in off-gas. Besides PH3 removal, oxidase activity and other characteristics such as phosphorous transformation and microbial community were investigated. When the PH3 concentration of the inlet gas was <30 mg/m3, the bioreactor achieved a relatively higher rate of PH3 removal, with a maximum rate of 72.9%. The activity of the enzyme superoxide dismutase increased with PH3 concentration; however, the bioreactor with an inlet gas PH3 concentration of 45 mg/m3 maintained lower catalase activity, revealing that high PH3 concentration had an adverse effect on biological process owing to PH3-induced oxidizing stress. Gaseous PH3 can be adsorbed by microbial organisms, but its final removal depends on microbial metabolism. Phosphorus converted from PH3 was eventually assimilated by microbes, and the total phosphorus in the supernatant was usually <1.0 mg/L during the whole operation period. Proteobacteria and Firmicutes were two major phyla in PH3 biopurification systems, and the genera Burkholderia and Methylophilus developed into the dominant microbes in activated sludge bioreactors, and these complex microbial communities may facilitate PH3 biopurification.
- Subjects
MICROBIAL communities; ACTIVATED sludge process; MICROBIAL metabolism; PHOSPHINE; SUPEROXIDE dismutase; PHOSPHINES; BACTERIAL communities; BACTERIAL population
- Publication
Environmental Engineering Science, 2021, Vol 38, Issue 8, p802
- ISSN
1092-8758
- Publication type
Article
- DOI
10.1089/ees.2020.0427