不同热解温度BC对BAF处理水产养殖废水的影响机制

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Abstract To improve the removal efficiency of nitrogen, phosphorus and antibiotics in aquaculture wastewater by traditional biological aeration filter (BAF), biochar (BC) derived from different pyrolysis temperatures (400, 500, 600 and 700℃) were filled in the BAFs (No 2#~5#) to treat artificial aquaculture wastewater containing sulfamethoxazole (SMX), sulfadiazine (SDZ), enrofloxacin (ENR) and ciprofloxacin (CIP), for revealing the removal performances of COD, ammonia nitrogen, TN, TP and four antibiotics during the start-up and operation period of the BAFs, with the traditional BAF loading zeolite as the control group (No.1 #). Several test methods were utilized to analyze the removal characteristics of the typical periodical target pollutants, and to detected the Extracellular polymeric substances (EPS) and microbe Electron transport system activity (ETSA) in the late period. Simultaneously, the key microbial population composition in each BAF were investigated by High-throughput sequencing technology. Results showed that the nitrogen, phosphorus and antibiotics removal performances in 2#~5# BAFs were enhanced by BC, and BC pyrolyzed at high temperature was more conducive to the removal of pollutants. The microbial EPS content and PN/PS value in the 2#~5# BAFs were higher than those in the control group, and increased with the increase of BC pyrolysis temperature. Although the ETSA was negatively correlated with the pyrolysis temperature of BC, the ETSA of 2#~5# BAFs were still higher than that of 1#BAF (the control group), filling BC could increase the electron transport in BAF. Meanwhile, functional genera related to antibiotic degradation and nitrogen and phosphorus removal were also detected in 2#~5# BAFs, such as Micropruina (relative abundance 0.42%~8.18%)、Rhodobacter (0.63%~2.94%)、norank_f__Chitinophagaceae (0.23%~3.98%) and Microbacterium (0.37%~1.66%) etc., whose relative abundances were positively correlated with BC pyrolysis temperature. During the stable operation time, the 5# BAF with BC pyrolysis temperature of 700℃ achieved the best decontamination efficiency, in which the average removal rates of TN and TP were 51.99% and 41.00%, and the average removal rates of SDZ, SMX, ENR and CIP were 71.84%, 75.01%, 62.91% and 69.62%, respectively.

Key words： aquaculture wastewater antibiotics biochar biological aeration filter (BAF) nitrogen and phosphorus removal

Received: 02 August 2022

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X703

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	Articles by authors
	LIU Si-qiang
	XIN Xin
	YANG Wen-yu
	YAN Xue-hua
	DAI You-xue
	HU Jin-tao

Cite this article:

LIU Si-qiang,XIN Xin,YANG Wen-yu等. Influence mechanisms of BC filters of different pyrolysis temperatures on BAFs treating aquaculture wastewater[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1131-1141.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I3/1131

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