CIESC Journal ›› 2019, Vol. 70 ›› Issue (9): 3511-3516.DOI: 10.11949/0438-1157.20190454

• Energy and environmental engineering • Previous Articles     Next Articles

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

Yongliang WANG1(),Xiaoling YANG1,Yongxia DONG1,Yingchao DU1,2,Xiang LIU1,2,Peiwei HAN1,Shufeng YE1   

  1. 1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
    2. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-05-05 Revised:2019-05-31 Online:2019-09-05 Published:2019-09-05
  • Contact: Yongliang WANG

pH调整剂对含砷酸性废水中氧化Fe(Ⅱ)共沉淀固砷行为的影响

王永良1(),杨晓玲1,董永霞1,杜英超1,2,刘翔1,2,韩培伟1,叶树峰1   

  1. 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
  • 通讯作者: 王永良
  • 作者简介:王永良(1984—),博士,助理研究员,Ylwang84@ipe.ac.cn
  • 基金资助:
    中国科学院重点部署项目(ZDRW-ZS-2018-1)

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.

Key words: arsenic, wastewater, immobilization, pH adjustment, leaching toxicity, environment

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。

关键词: 砷, 废水, 固定化, pH调整剂, 浸出毒性, 环境

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