Effect of pH adjustment on immobilization of arsenic by coprecipitation through oxidizing Fe(Ⅱ) in acidic wastewater containing arsenic

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Effect of pH adjustment on immobilization of arsenic by coprecipitation through oxidizing Fe(Ⅱ) in acidic wastewater containing arsenic

更新时间：2026-03-25

- Effect of pH adjustment on immobilization of arsenic by coprecipitation through oxidizing Fe(Ⅱ) in acidic wastewater containing arsenic
- CIESC Journal Vol. 70, Issue 9, Pages: 3511-3516(2019)
- 作者机构：
  
  1. 中国科学院过程工程研究所多相复杂系统国家重点实验室,北京,100190
  2. 中国科学院大学化学与化工学院,北京,100049
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190454
  CLC： X75
- Online First：05 September 2019，
  
  Published：05 September 2019
- 稿件说明：
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Yongliang WANG, Xiaoling YANG, Yongxia DONG, et al. Effect of pH adjustment on immobilization of arsenic by coprecipitation through oxidizing Fe(Ⅱ) in acidic wastewater containing arsenic[J]. CIESC Journal, 2019, 70(9): 3511-3516.
DOI：

Yongliang WANG, Xiaoling YANG, Yongxia DONG, et al. Effect of pH adjustment on immobilization of arsenic by coprecipitation through oxidizing Fe(Ⅱ) in acidic wastewater containing arsenic[J]. CIESC Journal, 2019, 70(9): 3511-3516. DOI： 10.11949/0438-1157.20190454.

摘要

双氧水催化氧化Fe（Ⅱ）共沉淀砷的过程中，采用不同的pH调整剂调节溶液的pH，研究了不同的pH调整剂对废水中砷沉淀效果及沉淀渣性质的影响。结果表明：采用Na2CO3和CaO作为pH调整剂时有利于废水中砷的脱除，生成的共沉淀渣中砷主要是以无定形的非晶态块状颗粒形式存在的；使用Na2CO3作为pH调整剂时最有利于沉淀渣颗粒的长大，所得沉淀渣粒径最大，但是砷渣的稳定性最差，更容易从渣中释放出砷；采用CaO获得的沉淀渣中由于CaSO4棒状颗粒的存在，渣的粒径相对较小，但砷的存在形式最为稳定，固砷效果最好。

Abstract

In the process of catalytic oxidation of Fe(Ⅱ) co-precipitated arsenic by hydrogen peroxide

different pH adjustments were used to adjust the pH of the solution. The effects of different pH adjustments on the precipitation of arsenic in wastewater and the properties of precipitated slag were studied. The results show that the pH adjustments of Na2CO3 and CaO are beneficial to the removal of arsenic from wastewater

and the arsenic in the coprecipitates is mainly in the form of amorphous bulk particles. When Na2CO3 is used as the pH adjustment

it is most favorable to the growth of particle size

the size of precipitates is the largest

but the stability of arsenic is the worst

and it is easier to release from the slag. The particle size of the precipitates obtained by CaO is relatively small due to the existence of CaSO4 rod-like particles

but the existence form of arsenic is the most stable

and the fixation effect of arsenic is the best.

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