盐酸羟胺强化Fe(Ⅲ)-EDDS/过硫酸盐处理水溶液中TCE

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Abstract

In this study, a reducing agent, hydroxylamine hydrochloride (HAH), was applied in a Fe(Ⅲ)-EDDS activated persulfate (PS) process, and the degradation performance of trichloroethylene (TCE) was investigated. The results indicated that TCE removal was significantly enhanced with the addition of HAH in the Fe(Ⅲ)-EDDS/PS process, and TCE degradation efficiency was increased with increasing PS or HAH concentration, while an optimum concentration of PS or HAH was observed under the experimental conditions. The effects of initial solution pH (from pH 3~7), Cl^- (1~100mmol/L) and HCO₃^- (1~10mmol/L) on TCE degradation performance were negligible, whereas alkaline conditions (pH 8~11) and high HCO₃^- concentration (25~100mmol/L) had negative effects. The results of ROS test showed that SO₄^·-, ^·OH, and O₂^·- were all generated in the Fe(Ⅲ)-EDDS/PS/HAH process, and SO₄^·- was the dominant radical responsible for TCE degradation.

Key words： hydroxylamine hydrochloride Fe (Ⅲ)-EDDS complex persulfate activation trichloroethylene reactive oxygen species

Received: 08 September 2017

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GU Xiao-gang. EDDS activated persulfate process enhanced by hydroxylamine hydrochloride for treatment of trichloroethylene in aqueous solution[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(4): 1385-1390.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I4/1385

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