纳米铁强化生物技术处理染料废水的效能

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Abstract A coupling system consisting of nano zero valent iron and membrane bioreactor (nZVI-bio system) was constructed to explore the feasibility and controllability of a continuous flow reactor for the treatment of Congo red (CR) wastewater. Since nZVI pretreatment converts CR macromolecules into small molecules, the biodegradability index denoted by BOD₅/COD increased from 0.04 to 0.69 and toxicity reduced from 90.25% to 30.57% compared to the initial CR wastewater, which provides good environmental conditions for biological units. During the continuous operation of the coupling system, CR removal efficiency reached 99% and COD was reduced from 167mg/L to 50mg/L (nZVI pretreatment process at an initial concentration of 500mg/L). However, the color removal efficiency was just 30%~70% and COD was reduced to 116mg/L for a conventional biotreatment system, and the fluctuation is large. The results demonstrated that the nZVI-bio system provides new technical support for deep treatment of refractory organic dyes.

Key words： nanoscale zero-valent iron nZVI-bio system continuous-flow reactors Congo red wastewater

Received: 13 May 2022

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X703.5

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	LIU Jing
	LIU Ai-rong
	ZHANG Wei-xian

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LIU Jing,LIU Ai-rong,ZHANG Wei-xian. Research on dyeing wastewater treatment with an integrated nanoscale zero-valent iron and biology technology[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5643-5649.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I12/5643

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