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混凝-超滤预沉积对去除腐殖酸的影响

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高倩, 张崇淼, 徐慧, 王东升, 门彬, 张大为, 罗柯. 混凝-超滤预沉积对去除腐殖酸的影响[J]. 环境化学, 2019, (7): 1645-1655. doi: 10.7524/j.issn.0254-6108.2018091403
引用本文: 高倩, 张崇淼, 徐慧, 王东升, 门彬, 张大为, 罗柯. 混凝-超滤预沉积对去除腐殖酸的影响[J]. 环境化学, 2019, (7): 1645-1655. doi: 10.7524/j.issn.0254-6108.2018091403
shu
GAO Qian, ZHANG Chongmiao, XU Hui, WANG Dongsheng, MEN Bin, ZHANG Dawei, LUO Ke. Effects of pre-deposition on removal of humic acid in the coagulation-ultrafiltration process[J]. Environmental Chemistry, 2019, (7): 1645-1655. doi: 10.7524/j.issn.0254-6108.2018091403
Citation: GAO Qian, ZHANG Chongmiao, XU Hui, WANG Dongsheng, MEN Bin, ZHANG Dawei, LUO Ke. Effects of pre-deposition on removal of humic acid in the coagulation-ultrafiltration process[J]. Environmental Chemistry, 2019, (7): 1645-1655. doi: 10.7524/j.issn.0254-6108.2018091403
shu

混凝-超滤预沉积对去除腐殖酸的影响

  • 1. 西安建筑科技大学环境与市政工程学院, 西安, 710055;

  • 2. 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京, 100085;

  • 3. 武汉市汉阳市政建设集团公司, 武汉, 430050

    • 通讯作者: 徐慧, E-mail: huixu@rcees.ac.cn ; 
  • 基金项目:

    国家自然科学基金重点项目（51338010），国家自然科学基金青年科学基金（51608515）和国家自然科学基金（21677156）资助.

Effects of pre-deposition on removal of humic acid in the coagulation-ultrafiltration process

  • 1. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China;

  • 2. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;

  • 3. Wuhan Hanyang Municipal Construction Group Corporation, Wuhan, 430050, China

    • Corresponding author: XU Hui, huixu@rcees.ac.cn ; 
  • Fund Project: Supported by the National Natural Science Foundation of China (51338010), the National Natural Science Foundation of China Youth Science Fund Project (51608515)and the National Natural Science Foundation of China(21677156).

  • 摘要: 探索利用在膜表面经过混凝预处理，调节膜-颗粒物作用行为的机制，从而改进超滤膜的净水效果是本文的研究核心.研究通过将AlCl3及Al13两种混凝剂形成的絮体以自然沉降的方式预先沉积在超滤膜表面，考察了对腐殖酸（HA）的去除情况及膜的净水行为.结果表明，使用Al13混凝剂在膜表面沉积的絮体能更好的去除HA，并在一定程度上缓解膜污染，而使用AlCl3则会加强膜污染现象.随着Al13混凝剂投加量从0.08 mmol·L-1增加到0.18 mmol·L-1时，对HA的去除率也从26%升高到34%，并在超滤膜表面形成预沉积层.在较高投加量0.18 mmol·L-1时，Al13混凝剂在膜表面形成的絮体分形维数（2.45）较AlCl3（2.29）大，但Al13形成的絮体粒径（300 nm）小于AlCl3形成的絮体粒径（600 nm），致使在膜表面形成的沉积层相对致密.Zeta电位分析结果表明，Al13混凝剂较AlCl3混凝剂具有更高的正电荷，较易吸附负电性的HA分子，因此去除HA效果更好，提高膜通量程度更大.
    Abstract: It is important to investigate effects of pre-deposition on removal of humic acid(HA) in the coagulation-ultrafiltration process. The flocs formed by AlCl3 and Al13 were pre-deposited on the surface of ultrafiltration membrane by natural sedimentation, and the removal of HA and the water purification process were investigated. The results showed that the flocs deposited on the surface of the membrane using Al13 coagulant could remove HA more efficiently and the membrane fouling could be alleviated, while the use of AlCl3 would enhance membrane fouling. As the Al13 coagulant dosage was increased from 0.08 mmol·L-1 to 0.18 mmol·L-1, the removal rate of HA was also increased from 26% to 34%. At a higher dosage of 0.18 mmol·L-1, the fractal dimension (2.45) of flocs formed by Al13 coagulant was larger than that of AlCl3 (2.29), but the floc size (300 nm) formed by Al13 was smaller than that of AlCl3(600 nm). Results of zeta potential showed that Al13 had larger amount of positive charges than AlCl3, and the flocs would adsorb HA molecules more easily.
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  • 收稿日期:  2018-09-14
高倩, 张崇淼, 徐慧, 王东升, 门彬, 张大为, 罗柯. 混凝-超滤预沉积对去除腐殖酸的影响[J]. 环境化学, 2019, (7): 1645-1655. doi: 10.7524/j.issn.0254-6108.2018091403
引用本文: 高倩, 张崇淼, 徐慧, 王东升, 门彬, 张大为, 罗柯. 混凝-超滤预沉积对去除腐殖酸的影响[J]. 环境化学, 2019, (7): 1645-1655. doi: 10.7524/j.issn.0254-6108.2018091403
shu
GAO Qian, ZHANG Chongmiao, XU Hui, WANG Dongsheng, MEN Bin, ZHANG Dawei, LUO Ke. Effects of pre-deposition on removal of humic acid in the coagulation-ultrafiltration process[J]. Environmental Chemistry, 2019, (7): 1645-1655. doi: 10.7524/j.issn.0254-6108.2018091403
Citation: GAO Qian, ZHANG Chongmiao, XU Hui, WANG Dongsheng, MEN Bin, ZHANG Dawei, LUO Ke. Effects of pre-deposition on removal of humic acid in the coagulation-ultrafiltration process[J]. Environmental Chemistry, 2019, (7): 1645-1655. doi: 10.7524/j.issn.0254-6108.2018091403
shu

混凝-超滤预沉积对去除腐殖酸的影响

    通讯作者: 徐慧, E-mail: huixu@rcees.ac.cn ; 
  • 1. 西安建筑科技大学环境与市政工程学院, 西安, 710055;
  • 2. 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京, 100085;
  • 3. 武汉市汉阳市政建设集团公司, 武汉, 430050
  • 收稿日期:  2018-09-14
基金项目:

国家自然科学基金重点项目（51338010），国家自然科学基金青年科学基金（51608515）和国家自然科学基金（21677156）资助.

摘要: 探索利用在膜表面经过混凝预处理，调节膜-颗粒物作用行为的机制，从而改进超滤膜的净水效果是本文的研究核心.研究通过将AlCl3及Al13两种混凝剂形成的絮体以自然沉降的方式预先沉积在超滤膜表面，考察了对腐殖酸（HA）的去除情况及膜的净水行为.结果表明，使用Al13混凝剂在膜表面沉积的絮体能更好的去除HA，并在一定程度上缓解膜污染，而使用AlCl3则会加强膜污染现象.随着Al13混凝剂投加量从0.08 mmol·L-1增加到0.18 mmol·L-1时，对HA的去除率也从26%升高到34%，并在超滤膜表面形成预沉积层.在较高投加量0.18 mmol·L-1时，Al13混凝剂在膜表面形成的絮体分形维数（2.45）较AlCl3（2.29）大，但Al13形成的絮体粒径（300 nm）小于AlCl3形成的絮体粒径（600 nm），致使在膜表面形成的沉积层相对致密.Zeta电位分析结果表明，Al13混凝剂较AlCl3混凝剂具有更高的正电荷，较易吸附负电性的HA分子，因此去除HA效果更好，提高膜通量程度更大.

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