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Influence of reflux ratio on two-stage anoxic/oxic with MBR for leachate treatment: Performance and microbial community structure
- Liu, Jianbo, Tian, Zhiyong, Zhang, Panyue, Qiu, Guanglei, Wu, Yan, Zhang, Haibo, Xu, Rui, Fang, Wei, Ye, Jie, Song, Yonghui, Zeng, Guangming
- Bioresource technology 2018 v.256 pp. 69-76
- Amaricoccus, Nitrobacter, Nitrosomonas, ammonia, chemical oxygen demand, community structure, high-throughput nucleotide sequencing, leachates, microbial communities, nitrogen, phylogeny, total nitrogen
- A lab-scale two-stage Anoxic/Oxic with MBR (AO/AO-MBR) system was operated for 81 days for leachate treatment with different reflux ratio (R). The best system performances were observed with a R value of 150%, and the average removal efficiencies of chemical oxygen demand, ammonia and total nitrogen were 85.6%, 99.1%, and 77.6%, respectively. The microbial community were monitored and evaluated using high-throughput sequencing. Proteobacteria were dominant in all process. Phylogenetic trees were described at species level, genus Thiopseudomonas, Amaricoccus, Nitrosomonas and Nitrobacter played significant roles in nitrogen removal. Co-occurrence analyzing top 20 genera showed that Nitrosomonas-Nitrobacter presented perfect positive relationship, as well as Paracoccus-Brevundimonas and Pusillimonas-Halobacteriovorax.