화학공학소재연구정보센터
Process Biochemistry, Vol.72, 137-142, 2018
Effects of light-oxygen conditions on microbial community of photosynthetic bacteria during treating high-ammonia wastewater
Photosynthetic bacteria (PSB) were reported to have great potential for nitrogen removal when treating high-ammonia wastewater. Light-oxygen conditions are the most important parameter; however, the role of the microbial community composition for PSB nitrogen removal remains unclear. This study focussed on the effects of three light-oxygen conditions on PSB performance and the microbial community during high-ammonia wastewater treatment. The results showed that light-oxygen conditions had a significant impact on nitrogen removal efficiency, microbial community diversity and composition. PSB under light-aerobic condition had the highest biomass, highest COD, NH4+-N, and NO3--N removal efficiency, and the highest community diversity; these results have not been reported before. The dominant genus in samples under light-aerobic condition was Pseudomonas (with a proportion of 58.23%). The correlation analysis showed that Pseudomonas was positively correlated with NH4+-N and NO3--N removal, with high correlation coefficients of 0.9. These results further revealed the underlying nitrogen removal mechanism of PSB in high-ammonia wastewater treatment.