磁性活性炭强化SBR脱氮除磷及微生物种群分析

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Abstract A novel magnetic activated carbon-based activated sludge process (named by number 1^#) was constructed by adding 140mesh of 1.00g/L magnetic activated carbon in a sequential batch activated sludge reactor (SBR) in order to improve nitrogen and phosphorus removal performance in the traditional activated sludge process. At the same time, the traditional activated sludge system without any magnetic material was taken as the control group (named by number 0^#). The effects of magnetic activated carbon on the decontamination performance and the microbial structural composition were studied. Meanwhile, the mechanisms of magnetic activated carbon to enhance nitrogen and phosphorus removal were also discussed. The results showed that the average removal efficiency of TN and TP in the 1^# was 68.59% and 78.25% respectively. While the average removal efficiency of control group (0^#) for TN and TP was 53.17% and 54.10%. The concentration of NO₃^--N from the 1^# decreased by 7.03mg/L on average. However, the removal efficiency of NH₄⁺-N and COD in the 0^# and 1^# were both above 95.00%. The declining rate of TN, NH₄⁺-N, TP and COD in the 1^# was faster than the control group 0^#. The efficiency of synchronous nitrification and denitrification in the reactor 0^# was 60.31%. The rate of denitrification was 4.44mg/(L·h), and the efficiency of synchronous nitrification and denitrification was 80.74%. The rate of denitrification in the reactor 1^# 6.13mg/(L·h). The denitrification efficiency in the reactor 1^# was significantly faster than that in the reactor 0^#. High-throughput sequencing results indicated that the dominant phylum in the reactor 1^# were Saccharibacteria (38.74%), Proteobacteria (22.52%), Actinobacteria (18.54%) and Chloroflexi (8.40%). In addition, compared with the reactor 0^#, the relative abundance of microorganisms in Actinobacteria, which is closely related to sludge swelling decreased significantly in the 1^#. The relative abundances of micropruina, shinella, norank_f_Anaerolineaceae and norank_f_Xanthomonadaceae, which are related to nitrogen and phosphorus removal bacteria population, were significantly higher than the control group. Adding a certain amount of magnetic activated carbon in the SBR system could not only inhibit the growth of microorganisms that caused sludge expansion, but also facilitate the enrichment of microorganisms for nitrogen and phosphorus removal. The 1^# showed the good stability and nitrogen and phosphorus removal performance.

Key words： magnetic activated carbon activated sludge nitrogen removal phosphorus removal microbial community

Received: 06 July 2020

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X703

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	YANG Hao
	XIN Xin
	CAO Xi-shuang
	WEN Qian
	ZHANG Xin-yu
	PENG Qi
	E Di

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YANG Hao,XIN Xin,CAO Xi-shuang等. Analysis of SBR loaded magnetic activated carbon for enhanced nitrogen and phosphorus removal and its microbial population[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1199-1207.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1199

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