NaHSO<sub>3</sub>和KMnO<sub>4</sub>组合可渗透反应栅对苯胺的去除特性

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Abstract Sodium bisulfite (NaHSO₃) was used to enhance the removal of aniline (AN) by potassium permanganate (KMnO₄). The relationship between AN removal rate and reaction conditions was studied through batch experiments, and the interaction between KMnO₄ dosage, NaHSO₃ dosage, initial pH, and reaction time was analyzed. The permeable reactive barrier (PRB) based on NaHSO₃ and KMnO₄ was prepared using paraffin as cementation agent for continuous treatment of simulated AN contaminated groundwater, and the release law of different PRBs and the removal characteristics of AN by PRBs were analyzed. The results showed that NaHSO₃ could significantly enhance the degradation rate of AN by KMnO₄. When the initial AN concentration was 5mg/L and NaHSO₃/KMnO₄/AN was 5/5/1, the AN removal rate reached 99.2%, which was higher than 85.6% treated with KMnO₄ alone. The AN removal rate was linearly positively correlated with the dosage of KMnO₄, the dosage of NaHSO₃ and the reaction time, and linearly negatively correlated with the initial pH of solution. A quadratic polynomial and stepwise regression method were used to fit the relationship between the AN removal rate and the reaction conditions. The simulated values were similar to the verification experimental results, indicating that the model accuracy was good. The dissolution rate of NaHSO₃ in PRB was significantly higher than that of KMnO₄. When the mass of SB/PM-PRB was 5g, the influent flow rate and AN concentration were 0.1mL/min and 10mg/L, respectively, the removal rate of AN remained above 99% within 168h. In addition, it overcame the problem of excessively high chroma when using KMnO₄ alone. Fourier transform infrared spectroscopy analysis showed that the PRB components did not change significantly before and after the reaction, indicating that the stability was good. The results of UV-vis scanning showed that the intensity of the characteristic peaks of AN and benzene ring decreased significantly, indicating that SB/PM-PRB can open the benzene ring and destroy the amino structure of AN.

Key words： potassium permanganate sodium bisulfite response surface method permeable reactive barrier

Received: 25 December 2019

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X703

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	YE Qian
	WANG Cheng-chen
	WANG Ming-xin
	HAN Ying
	XUE Jin-juan

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YE Qian,WANG Cheng-chen,WANG Ming-xin等. Characteristics of aniline removal using composite permeable reaction barrier based on NaHSO₃ and KMnO₄[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 2960-2969.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I7/2960

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