华南理工大学学报（自然科学版） ›› 2017, Vol. 45 ›› Issue (6): 139-144.doi: 10.3969/j.issn.1000-565X.2017.06.021

• 环境科学与工程 • 上一篇    

复配混凝剂去除地下水中溶解性硅酸盐的试验研究

陶辉1,2,3 赖连花1,2 陈清3 白新征3   

  1. 1． 河海大学 浅水湖泊综合治理与资源开发教育部重点实验室，江苏 南京 210098; 2． 河海大学 环境学院，江苏 南京 210098; 3． 苏州立升净水科技有限公司，江苏 苏州 215152
  • 收稿日期:2016-09-29 修回日期:2016-12-21 出版日期:2017-06-25 发布日期:2017-05-02
  • 通信作者: 陶辉(1981-)，男，副教授，主要从事饮用水处理研究． E-mail:taohui@hhu.edu.cn
  • 作者简介:陶辉(1981-)，男，副教授，主要从事饮用水处理研究．
  • 基金资助:

    水体污染控制与治理科技专项基金资助项目(2014ZX07405);2015 年江苏省“双创计划”项目;江苏省高校优势 学科建设工程资助项目

Experimental Investigation into Removal of Soluble Silicate in Groundwater by Using Compound Coagulants

TAO Hui1,2,3 LAI Lian-hua1,2 CHEN Qing3 BAI Xin-zheng3   

  1. 1.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of the Ministry of Education，Hohai University,Nanjing 210098,Jiangsu,China; 2.College of Environment,Hohai University,Nanjing 210098,Jiangsu,China; 3.Suzhou Litree Water Purification Technology Co.,Ltd.,Suzhou 215152,Jiangsu,China
  • Received:2016-09-29 Revised:2016-12-21 Online:2017-06-25 Published:2017-05-02
  • Contact: 陶辉(1981-)，男，副教授，主要从事饮用水处理研究． E-mail:taohui@hhu.edu.cn
  • About author:陶辉(1981-)，男，副教授，主要从事饮用水处理研究．
  • Supported by:

    Supported by the Found of Major Science and Technology Program for Water Pollution Control and Treatment (2014ZX07405) and the Found of“Double Creation Plan”in Jiangsu Province

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摘要： 为有效去除水中的溶解性硅酸盐，以某溶解性硅酸盐含量高达50 ～60mg/L 的地 下水为对象，开展复配混凝剂去除水中溶解性硅酸盐的试验研究． 结果表明:当 Ca(OH)2 投加量为 450mg/L 时，对水中溶解性硅酸盐和浑浊度的去除率分别为 51． 16%和 74． 8%; 进一步增加 Ca(OH)2 投加量可进一步强化溶解性硅酸盐的去除，但会引起出水 pH 值的 大幅升高;FeCl3 对水中溶解性硅酸盐的去除率低于 12． 55%，但其对出水浑浊度具有明 显的控制优势;MgO 对水中溶解性硅酸盐的最优投加量为 400 mg/L，此时去除率为 14． 53%，处理后出水浑浊度较高;FeCl3 复配 Ca(OH)2 时，对水中溶解性硅酸盐的去除率 超过 60%，并且出水浑浊度低于 0． 65NTU;FeCl3 复配 MgO 时，对水中溶解性硅酸盐的去 除率可达 75% 以上;Ca(OH)2 复配 MgO 时，对水中溶解性硅酸盐的去除率最高达 73． 76%，较单独使用 Ca(OH)2 除硅时(81． 41%)有所下降． 3 种复配方案中，以 FeCl3 复 配 MgO 的方案为佳，在此方案下，当 Fe3+ 质量浓度为16．8mg/L、MgO 质量浓度为 500mg/L 时，硅的去除率达 76． 67%，滤后浑浊度为 0． 83NTU，同时出水 pH 值最低，可节省后续调 整 pH 时的酸用量．

关键词: 地下水, 溶解性硅酸盐, 混凝, 复配混凝剂

Abstract:

In order to effectively remove the soluble silicate in water,by taking the groundwater with a soluble sili- cate content of 50 ～60mg/L as the research objective,coagulation experiments for the soluble silicate removal by using different compound coagulants were performed.The results show that (1) when the dosage of Ca(OH)2 is 450mg/L,the removal of soluble silicate and the turbidity reaches 51.16% and 74. 8%,respectively; (2) with the increase of Ca(OH)2 dosage (more than 450mg/L),the removal of soluble silicate slightly increases while the pH value of the effluent greatly increases,too; (3) FeCl3 has a poor removal on soluble silicate (less than 12. 55%) but has an advantage in turbidity control; (4) MgO possesses poor efficiency for both soluble silicate re- moval (less than 14. 53%) and turbidity control,and the optimal MgO dosage is 400mg/L; (5) the compound of FeCl3 and Ca(OH)2 possesses good performance on both soluble silicate removal and turbidity control,more than 60% of soluble silicate is removed and the effluent turbidity is less than 0. 65NTU; (6) the compound of FeCl3 and MgO also possesses good performance on both soluble silicate removal and turbidity control,more than 75% of solu- ble silicate is removed; (7) the compound of Ca(OH)2 and MgO results in a soluble silicate removal up to 73. 76%,which is relatively less than that contributed by Ca(OH)2 only (81. 41%); and (8) among the three a- bove-mentioned compound approaches,the compound of FeCl3 and MgO with a Fe3+ dosage of 16. 8 mg/L and a MgO dosage of 500mg/L is the best because it results in a soluble silicate removal of 76. 67% and an effluent tur- bidity of 0. 83NTU,and because it helps to obtain effluent with the lowest pH value,which saves the acid added in the later process.

Key words: groundwater, soluble silicate, coagulation, compound coagulant

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