Research on dyeing wastewater treatment with an integrated nanoscale zero-valent iron and biology technology
LIU Jing, LIU Ai-rong, ZHANG Wei-xian
College of Environmental Science and Engineering, Tongji University, State Key Laboratory of Pollution Control and Resource Reuse, Shanghai 200092, China
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.
刘静, 刘爱荣, 张伟贤. 纳米铁强化生物技术处理染料废水的效能[J]. 中国环境科学, 2022, 42(12): 5643-5649.
LIU Jing, LIU Ai-rong, ZHANG Wei-xian. Research on dyeing wastewater treatment with an integrated nanoscale zero-valent iron and biology technology. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5643-5649.
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