引用本文:
王悦, 周孜迈, 邓文娜, 张政超, 唱天鹰, 柳听义. 两种体系去除水体中的砷[J]. 环境化学, 2018, 37(12): 2613-2620
WANG Yue, ZHOU Zimai, DENG Wenna, ZHANG Zhengchao, CHANG Tianying, LIU Tingyi. A study on the removal of arsenic from water by two systems[J]. Environmental Chemistry, 2018, 37(12): 2613-2620

两种体系去除水体中的砷
王悦1,2, 周孜迈1,2, 邓文娜1,2, 张政超1,2, 唱天鹰1,2, 柳听义1
1. 天津师范大学, 天津市水环境与水资源重点实验室, 天津, 300387;
2. 天津师范大学地理与环境科学学院, 天津, 300387
摘要:
砷是人类发现的毒性最强的环境污染物质之一.铁及其化合物已经被广泛应用于水体中重金属的去除并取得了一定效果,但存在去除效率低、材料成本高的缺点.为了更好地利用铁及其化合物高效去除水中重金属砷(As),本文通过加入氧化剂构建了两种反应体系,实现了对废水中砷的高效去除:分别利用零价铁(Zero valent iron,ZVI)活化过硫酸钠(sodium persulfate,PS)和亚铁离子(Fe2+)活化高锰酸钾(KMnO4)两种工艺去除了水体中的砷.通过批试验控制过硫酸钠、零价铁及高锰酸钾和亚铁的投加量,研究了各变量对As的去除效果和动力学影响.利用环境扫描电镜(SEM)对反应前后的物质的结构进行表征对比分析.研究结果表明:As溶液浓度为20 mg·L-1时,两种体系下的反应物最佳配比方案分别为0.5 g ZVI、0.1 g PS和KMnO4 0.01 g、Fe2+ 0.02 g.两种体系中As的去除率都大于99%,且反应均符合准二级动力学方程,其中,ZVI活化PS反应中产生的SO4-·对砷的去除有着至关重要的作用.两种方法对As的去除机理均包括吸附、沉淀和共沉淀作用.通过经济成本对比分析,PS-ZVI在高效去除毒性略低的As(Ⅴ)的时有明显的经济优势.
关键词:        高级氧化    去除方法    机理   
A study on the removal of arsenic from water by two systems
WANG Yue1,2, ZHOU Zimai1,2, DENG Wenna1,2, ZHANG Zhengchao1,2, CHANG Tianying1,2, LIU Tingyi1
1. Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, 300387, China;
2. School of Geographic and Environmental Sciences, Tianjin Normal University, Tianjin, 300387, China
Abstract:
Arsenic is one of most toxic pollutants in some industrial effluents and contaminated waters. Iron and its compounds have been used to remove arsenic from wastewater successfully and effectively. However, low removal efficiency and high material cost limit its widely use. In order to enhance removal rates of arsenic using iron and its compounds, two oxidants (sodium persulfate (PS) and potassium permanganate (KMnO4)) were introduced into PS-zero-valent iron (PS-ZVI) and KMnO4-Fe2+ systems, respectively. The effects of various variables were studied by controlling the dosage of ZVI powder, PS, KMnO4 and Fe2+, respectively. The morphologies of ZVI before and after reaction were characterized by scanning electron microscopy (SEM). With an initial As (V) concentration of 20 mg·L-1,ZVI dosage of 0.5 g, PS dosage of 0.1 g (KMnO4 dosage of 0.01 g, Fe2+ dosage of 0.02 g), pH 7 and a temperature of 20℃,removal rate reached 100%. It demonstrated that removal rates of As (V) are all more than 99% when the concentration of As (V) was between 20-100 mg·L-1. Pseudo-second order kinetic model can well describe the reaction. Furthermore, PS activated by ZVI was much effective to remove As(V) from wastewater due to the production of sulfate radical, which played an important role in the process. The study indicated that removal mechanism of As (V) by both systems mainly included adsorption, precipitation and co-precipitation. In contrast, PS-ZVI system has obvious economic advantages in efficiently removing As (V) from wastewater.
Key words:    arsenic    advanced oxidation    removal method    mechanism   
收稿日期: 2018-03-30
基金项目: 国家自然科学基金(21307090)和天津市科委应用基础与前沿技术研究计划重点项目(14JCZDJC41000)资助.
柳听义,Tel:+8602223766557,E-mail:liutingyi@mail.tjnu.edu.cn
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