工业水处理 ›› 2026, Vol. 46 ›› Issue (2): 168-174. doi: 10.19965/j.cnki.iwt.2025-0152

• 试验研究 • 上一篇    

化学还原-沉淀法对地下水中Cr(Ⅵ)和Ni2+的去除效果研究

牛建敏1(), 洪佳伟2, 臧翀1,2, 马晶伟2(), 周敏1, 施周2, 邓林2, 李红艳1   

  1. 1. 深圳市综合交通与市政工程设计研究总院有限公司,广东 深圳 518003
    2. 湖南大学土木工程学院,湖南 长沙 410082
  • 收稿日期:2025-12-07 出版日期:2026-02-20 发布日期:2026-03-03
  • 通讯作者: 马晶伟
  • 作者简介:

    牛建敏(1982— ),高级工程师,E-mail:

Study on the removal effect of Cr(Ⅵ) and Ni2+ in groundwater by chemical reduction-precipitation method

Jianmin NIU1(), Jiawei HONG2, Chong ZANG1,2, Jingwei MA2(), Min ZHOU1, Zhou SHI2, Lin DENG2, Hongyan LI1   

  1. 1. Shenzhen Integrated Transportation and Municipal Engineering Design Research Institute Co. , Ltd. , Shenzhen 518003, China
    2. Civil Engineering College, Hunan University, Changsha 410082, China
  • Received:2025-12-07 Online:2026-02-20 Published:2026-03-03
  • Contact: Jingwei MA

摘要:

针对工业废水渗滤导致的地下水六价铬〔Cr(Ⅵ)〕和镍(Ni2+)复合污染问题,采用硫酸亚铁(FeSO4·7H2O)化学还原法结合氢氧化物沉淀法开展修复研究。以Cr(Ⅵ)-Ni2+复合污染的模拟地下水为处理对象,系统考察了模拟水样初始pH、FeSO4·7H2O投加量、沉淀反应pH和离子沉淀顺序对Cr(Ⅵ)和Ni2+去除效能的影响,得到两种优化后的去除方案,即在pH为7左右的原水体系中,按Cr(Ⅵ)与FeSO4·7H2O质量比1∶18投加FeSO4·7H2O,将Cr(Ⅵ)还原为Cr(Ⅲ)后调节体系pH至9.5进行Cr(Ⅲ)和Ni2+的共沉淀,或预先将水样pH调至9.5进行预沉淀分离去除Ni2+,随后按Cr(Ⅵ)与FeSO4·7H2O质量比1∶18投加FeSO4·7H2O进行还原反应并通过二次沉淀去除Cr(Ⅵ)。实验结果表明,两种方案下Cr(Ⅵ)和Ni2+的剩余质量浓度均满足《地下水质量标准》(GB/T 14848—2017)Ⅳ类水要求,Cr(Ⅵ)和Ni2+最终分别以Cr(OH)3和Ni(OH)2的沉淀形态被去除。

关键词: 化学还原, 地下水, 六价铬, 镍, 硫酸亚铁

Abstract:

In response to the problem of combined pollution of hexavalent chromium〔Cr(Ⅵ)〕 and nickel(Ni2+) in groundwater caused by industrial wastewater infiltration, remediation research was carried out using the chemical reduction method of ferrous sulfate(FeSO4·7H2O) combined with hydroxide precipitation method. Taking simulated groundwater polluted by Cr(Ⅵ) -Ni2+ as the treatment object, the effects of initial pH of simulated water sample, dosage of FeSO4·7H2O, pH of precipitation reaction and ionic precipitation sequence on the removal efficiency of Cr(Ⅵ) and Ni2+ were systematically investigated. Two optimized removal schemes were obtained. In a raw water system with pH of about 7, FeSO4·7H2O was added at a mass ratio of 1∶18 between Cr(Ⅵ) and FeSO4·7H2O to reduce Cr(Ⅵ) to Cr(Ⅲ), after which the pH was adjusted to 9.5 for co-precipitation of Cr(Ⅲ) and Ni2+. Alternatively, the water sample was pre-adjusted to pH 9.5 for preliminary precipitation to remove Ni2+, followed by the addition of FeSO4·7H2O at a mass ratio of 1∶18 between Cr(Ⅵ) and FeSO4·7H2O for the reduction reaction and subsequent removal of Cr(Ⅵ) through secondary precipitation. The experimental results showed that the residual mass concentrations of Cr(Ⅵ) and Ni2+ under both schemes met the requirements of Class Ⅳ water in the Standard for Groundwater Quality(GB/T 14848—2017), and Cr(Ⅵ) and Ni2+ were ultimately removed in the form of Cr(OH)3 and Ni(OH)2 precipitates, respectively.

Key words: chemical reduction, groundwater, hexavalent chromium, nickel, ferrous sulphate

中图分类号: