纳米SiO2在含阴离子表面活性剂低浊水处理中的应用

环境工程学报

纳米SiO2在含阴离子表面活性剂低浊水处理中的应用

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李冬梅, 王巧, 黄文权, 林显增, 黄远强, 钟立, 陈伟锋. 纳米SiO2在含阴离子表面活性剂低浊水处理中的应用[J]. 环境工程学报, 2008, 2(2).

引用本文:

李冬梅, 王巧, 黄文权, 林显增, 黄远强, 钟立, 陈伟锋. 纳米SiO2在含阴离子表面活性剂低浊水处理中的应用[J]. 环境工程学报, 2008, 2(2).

LiDongmei, Wang Qiao, Huang Wenquan, Lin Xianzeng, Huang Yuanqiang, Zhong Li, Chen Weifeng. Application of silica nano-particles in treatment of low turbidity raw water containing anion surfactant[J]. Chinese Journal of Environmental Engineering, 2008, 2(2).

Citation:

LiDongmei, Wang Qiao, Huang Wenquan, Lin Xianzeng, Huang Yuanqiang, Zhong Li, Chen Weifeng. Application of silica nano-particles in treatment of low turbidity raw water containing anion surfactant[J]. Chinese Journal of Environmental Engineering, 2008, 2(2).

纳米SiO2在含阴离子表面活性剂低浊水处理中的应用

1.
广东工业大学建设学院，广州 510500
2.
湖南大学土木工程学院，长沙410082
基金项目:
国家自然科学基金项目(50170897)

广东省自然科学基金项目（06300267）

新进科技基金项目(XJ200617)

中国博士后科学基金资助项目（20060390869）
中图分类号: X131

Application of silica nano-particles in treatment of low turbidity raw water containing anion surfactant

1.
School of Construction, Guangdong University of Technology, Guangzhou 510500
2.
2.School of Civil Engineering, Hunan University, Changsha 410082
Fund Project:

摘要: 在含有阴离子表面活性剂十二烷基硫酸钠 (SDS)的6 NTU高岭土悬浊液中，改变SDS的浓度，投加纳米SiO2与聚合铝PAC进行动态混凝实验与静沉实验，借助图像分析技术与分形理论，探讨了纳米SiO2与PAC处理含SDS低浊水的作用机理、絮凝效果与形态学特征。结果表明：①纳米SiO2与SDS使高岭土粒子表面负电性增强。纳米SiO2的絮凝机理以吸附架桥为主。②纳米SiO2对SDS的去除效果优于PAC。SDS浓度越高，去除效果越显著。但纳米SiO2对无机高岭土粒子的处理能力不如PAC，PAC絮凝后的上清液浊度低。当SDS浓度增至10 mg/L时，纳米SiO2对SDS的去除率高，而PAC对SDS的絮凝能力弱，PAC对无机颗粒的去除效果也下降。③助凝剂纳米SiO2较强的吸附活性能加快PAC絮体成长为结构密实的RLCA构型，分维值高，絮凝效果好。
- 纳米SiO2稳定分散液 /
- 阴离子表面活性剂SDS /
- 聚合铝PAC /
- 絮凝效果形态学特性分形
Abstract: In the process of treating 6 NTU kaolin suspensions containing anion surfactantsodium dodecyl sulfate（SDS）whose concentration was changed, dynamic coagulation experiments and quiescent settling tests were done by the addition of silica nanoparticles stable dispersion solution and polymeric aluminium chloride (PAC). Using image analytical technology and fractal mathematic theory, it was discussed that action mechanisms, flocculation efficiencies, and morphologic properties of silica nanoparticles to low turbidity of raw water containing SDS. Results are shown as follows: ①Under the action of silica nanoparticles and SDS, absolute value of Zeta potential on the surfaces of kaolin particles increases greatly. The main flocculation mechanism of silica nanoparticles is adsorption-bridging. ② Removal efficiency of silica nanoparticles to SDS is better than that of PAC. The higher of SDS concentration is, the more outstanding removal efficiency of silica nanoparticles there is. However, the treatment efficiency of silica nanoparticles to the inorganic kaolin particles is not as good as PAC, for supernatant residual turbidity is low after PAC flocculation. When SDS concentration increases to 10 mg/L, removal rate of silica nanoparticles to SDS is enhanced markedly, but the flocculation capability of PAC to SDS is weak, and the treatment efficiencies of PAC to inorganic particles go down. ③When silica nanoparticles serves as a flocculant aid, strong adsorption energy of silica nanoparticles can accelerate the growth rates of PAC flocs, then PAC flocs are changed into compact RLCA configurations, whose fractal dimension values are high, and good flocculation efficiencies occur.

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李冬梅, 王巧, 黄文权, 林显增, 黄远强, 钟立, 陈伟锋. 纳米SiO2在含阴离子表面活性剂低浊水处理中的应用[J]. 环境工程学报, 2008, 2(2).

引用本文:

李冬梅, 王巧, 黄文权, 林显增, 黄远强, 钟立, 陈伟锋. 纳米SiO2在含阴离子表面活性剂低浊水处理中的应用[J]. 环境工程学报, 2008, 2(2).

LiDongmei, Wang Qiao, Huang Wenquan, Lin Xianzeng, Huang Yuanqiang, Zhong Li, Chen Weifeng. Application of silica nano-particles in treatment of low turbidity raw water containing anion surfactant[J]. Chinese Journal of Environmental Engineering, 2008, 2(2).

Citation:

LiDongmei, Wang Qiao, Huang Wenquan, Lin Xianzeng, Huang Yuanqiang, Zhong Li, Chen Weifeng. Application of silica nano-particles in treatment of low turbidity raw water containing anion surfactant[J]. Chinese Journal of Environmental Engineering, 2008, 2(2).

纳米SiO2在含阴离子表面活性剂低浊水处理中的应用

1. 广东工业大学建设学院，广州 510500
2. 湖南大学土木工程学院，长沙410082

收稿日期: 2007-11-02

基金项目:

国家自然科学基金项目(50170897)

广东省自然科学基金项目（06300267）

新进科技基金项目(XJ200617)

中国博士后科学基金资助项目（20060390869）

关键词:

摘要: 在含有阴离子表面活性剂十二烷基硫酸钠 (SDS)的6 NTU高岭土悬浊液中，改变SDS的浓度，投加纳米SiO2与聚合铝PAC进行动态混凝实验与静沉实验，借助图像分析技术与分形理论，探讨了纳米SiO2与PAC处理含SDS低浊水的作用机理、絮凝效果与形态学特征。结果表明：①纳米SiO2与SDS使高岭土粒子表面负电性增强。纳米SiO2的絮凝机理以吸附架桥为主。②纳米SiO2对SDS的去除效果优于PAC。SDS浓度越高，去除效果越显著。但纳米SiO2对无机高岭土粒子的处理能力不如PAC，PAC絮凝后的上清液浊度低。当SDS浓度增至10 mg/L时，纳米SiO2对SDS的去除率高，而PAC对SDS的絮凝能力弱，PAC对无机颗粒的去除效果也下降。③助凝剂纳米SiO2较强的吸附活性能加快PAC絮体成长为结构密实的RLCA构型，分维值高，絮凝效果好。

English Abstract

Application of silica nano-particles in treatment of low turbidity raw water containing anion surfactant

1. School of Construction, Guangdong University of Technology, Guangzhou 510500
2. 2.School of Civil Engineering, Hunan University, Changsha 410082

Received Date: 2007-11-02

Fund Project:

Keywords:

Abstract: In the process of treating 6 NTU kaolin suspensions containing anion surfactantsodium dodecyl sulfate（SDS）whose concentration was changed, dynamic coagulation experiments and quiescent settling tests were done by the addition of silica nanoparticles stable dispersion solution and polymeric aluminium chloride (PAC). Using image analytical technology and fractal mathematic theory, it was discussed that action mechanisms, flocculation efficiencies, and morphologic properties of silica nanoparticles to low turbidity of raw water containing SDS. Results are shown as follows: ①Under the action of silica nanoparticles and SDS, absolute value of Zeta potential on the surfaces of kaolin particles increases greatly. The main flocculation mechanism of silica nanoparticles is adsorption-bridging. ② Removal efficiency of silica nanoparticles to SDS is better than that of PAC. The higher of SDS concentration is, the more outstanding removal efficiency of silica nanoparticles there is. However, the treatment efficiency of silica nanoparticles to the inorganic kaolin particles is not as good as PAC, for supernatant residual turbidity is low after PAC flocculation. When SDS concentration increases to 10 mg/L, removal rate of silica nanoparticles to SDS is enhanced markedly, but the flocculation capability of PAC to SDS is weak, and the treatment efficiencies of PAC to inorganic particles go down. ③When silica nanoparticles serves as a flocculant aid, strong adsorption energy of silica nanoparticles can accelerate the growth rates of PAC flocs, then PAC flocs are changed into compact RLCA configurations, whose fractal dimension values are high, and good flocculation efficiencies occur.

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