化工进展 ›› 2022, Vol. 41 ›› Issue (5): 2753-2760.DOI: 10.16085/j.issn.1000-6613.2021-0959

• 资源与环境化工 • 上一篇    下一篇

活化过硫酸盐修复苯胺污染地下水及其环境风险

李坡1(), 张珊珊1, 施锦秋1, 高航1, 王明新1,2()   

  1. 1.常州大学环境与安全工程学院,江苏 常州 213164
    2.江苏省石油化工安全与环保工程研究中心,江苏 常州 213164
  • 收稿日期:2021-05-06 修回日期:2021-07-28 出版日期:2022-05-05 发布日期:2022-05-24
  • 通讯作者: 王明新
  • 作者简介:李坡(1996—),男,硕士研究生,研究方向为地下水修复。E-mail:lipocd@163.com
  • 基金资助:
    国家自然科学基金(41772240);江苏省重点研发(社会发展)项目;江苏省研究生实践创新计划(KYCX21_2870)

Remediation of aniline-contaminated groundwater by activated persulfate and its environmental risks

LI Po1(), ZHANG Shanshan1, SHI Jinqiu1, GAO Hang1, WANG Mingxin1,2()   

  1. 1.School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
    2.Jiangsu Engineering Research Center of Petrochemical Safety and Environmental Protection, Changzhou 213164, Jiangsu, China
  • Received:2021-05-06 Revised:2021-07-28 Online:2022-05-05 Published:2022-05-24
  • Contact: WANG Mingxin

摘要:

采用砂柱实验对模拟苯胺(AN)污染地下水进行连续处理,研究了碱(NaOH)活化、铁(Fe2+)活化和过氧化氢(H2O2)活化三种过硫酸盐(PS)活化方式对AN的去除效果及环境风险。结果表明,H2O2活化PS处理对AN去除效果最好,4天内AN累计去除率达到了60%。当H2O2浓度递减注射时,4天内AN累计去除率达到了83%,克服了恒定浓度注射时的氧化剂浪费问题。各处理的总有机碳(TOC)矿化率远小于AN去除率,表明大量AN不完全降解。GC/MS分析表明,降解产物主要有对苯醌、偶氮苯和直链烷烃。碱活化显著提升了体系pH,其他反应体系均为中性,反应后pH均下降。H2O2活化PS处理的氧化还原电位稳定保持较高水平。处理后的水质急性毒性均高于处理前,主要源于过硫酸钠分解后残留的硫酸盐,使修复后地下水饱和带形成高盐区。因此,采用活化PS原位注射修复时,需对二次污染风险进行严格地评估和防控。

关键词: 活化过硫酸盐, 原位化学氧化, 地下水修复, 生态风险评价, 毒性分析

Abstract:

In this paper, a simulated groundwater polluted by aniline (AN) was treated continuously in a sand column. The removal effect and environmental risks of three persulfate (PS) activation methods on AN were studied. The activators were alkali (NaOH), iron (Fe2+) and hydrogen peroxide (H2O2). Results showed that H2O2 activated PS treatment had the best removal effect on AN. Cumulative removal rate of AN reached 60% within 4 days. When H2O2 concentration decreased, the cumulative removal rate of AN reached 83% within 4 days, which could overcome the problem of oxidant waste in constant concentration injection. The total organic carbon (TOC) mineralization rate of each treatment was far less than the AN removal rate, indicating that a lot of AN was not completely degraded. GC/MS analysis showed that the degradation products mainly included p-benzoquinone, azobenzene and straight-chain alkanes. Alkali activation significantly increased the pH of the system, while other reaction systems were all neutral, and pH decreased after reaction. The REDOX potential of PS activated by H2O2 was stable and maintained a high level. The acute toxicity of different treatments was higher than before the restoration, which was mainly because the residual sulfate after the decomposition of sodium persulfate made the groundwater saturated zone form a high-salt zone. Therefore, in situ injection of activated persulfate for remediation, the risk of secondary contamination should be strictly assessed and controlled.

Key words: activated persulfate, in situ chemical oxidation, groundwater remediation, ecological risk assessment, toxicity analysis

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