微波活化过硫酸盐耦合混凝处理二硝基重氮酚工业废水

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Abstract

MW activated PS coupling coagulation process was applied to treat the dinitrodiazophenol (DDNP) industrial wastewater in this study. The effects of PS dosage, n(Fe²⁺/PS), initial pH and MW power on organic compounds removal efficiency of DDNP wastewater were investigated. The effect and synergistic mechanism of DDNP wastewater degradation were compared by using control experiments, and the structural transformation of organics by oxidation of MW-Fe²⁺/PS system was characterized by UV-Vis and FTIR spectra. The reactive oxidative species (ROS) were identified by adding radical scavengers. The results indicated that under optimum condition of PS dosage of 8g/L, initial pH of 3, MW power of 600W, n(Fe²⁺/PS) ratio of 0.04, and reaction time of 8min, the COD and CN removal efficiency were 70.79% and 94.53%, respectively. Meanwhile, the COD removal rate of the effluent after coagulation increased, but the removal rate of CN decreased slightly. In addition, MW, PS and Fe²⁺ had the synergetic effect. The increase of B/C from 0.05 to 0.56 indicated that the biodegradability of the wastewater was significantly improved. Moreover, ·SO₄^- and ·OH are the most critical ROS in the system, which can destroy benzene ring, nitro (-NO₂) and azo group (-N=N-) and form by-products containing N-H and C-O-H.

Key words： sulfate radical advanced oxidation process DDNP industrial wastewater FTIR UV-Vis

Received: 20 May 2018

PACS:

X703.5

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	Articles by authors
	HOU Xian-yu
	CHEN Wei-ming
	LI Qi-bin
	GU Zhe-pei
	ZHANG Ai-ping

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HOU Xian-yu,CHEN Wei-ming,LI Qi-bin等. Removal of refractory organic compounds in DDNP industrial wastewater by MW activated PS coupling coagulation process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(12): 4551-4558.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I12/4551

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