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典型pH条件下水中离子对腐殖酸絮凝体构造的影响

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冯永宁, 金鹏康, 王晓昌. 典型pH条件下水中离子对腐殖酸絮凝体构造的影响[J]. 环境化学, 2013, 32(6): 1088-1093. doi: 10.7524/j.issn.0254-6108.2013.06.026
引用本文: 冯永宁, 金鹏康, 王晓昌. 典型pH条件下水中离子对腐殖酸絮凝体构造的影响[J]. 环境化学, 2013, 32(6): 1088-1093. doi: 10.7524/j.issn.0254-6108.2013.06.026
shu
FENG Yongning, JIN Pengkang, WANG Xiaochang. Effects of ion in water on humic acid floc structure under typical pH conditions[J]. Environmental Chemistry, 2013, 32(6): 1088-1093. doi: 10.7524/j.issn.0254-6108.2013.06.026
Citation: FENG Yongning, JIN Pengkang, WANG Xiaochang. Effects of ion in water on humic acid floc structure under typical pH conditions[J]. Environmental Chemistry, 2013, 32(6): 1088-1093. doi: 10.7524/j.issn.0254-6108.2013.06.026
shu

典型pH条件下水中离子对腐殖酸絮凝体构造的影响

  • 1.

    西安建筑科技大学环境与市政工程学院, 710055, 西安

  • 基金项目:

    国家自然科学基金项目(50978211)资助.

Effects of ion in water on humic acid floc structure under typical pH conditions

  • 1.

    School of Environmental & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an, 710055, China

  • Fund Project:

  • 摘要: 分析评价了几种典型化学条件对腐殖酸絮凝体构造的影响.研究结果表明,在pH=5.0低投药量下以共聚络合为主要混凝机理所形成的絮凝体结构密实,粒径分布均匀,强度大.而pH=5高投药量以及pH=7.0两种情况下的混凝机理都是以吸附和网扫絮凝为主,此时形成的絮凝体构造特征相似,尽管尺寸较大,但是结构松散,强度较小.针对水中常见的主量阴阳离子,分析探讨了典型离子对絮凝体构造特征的影响.研究表明,Cl-在腐殖酸水样中的存在对絮凝体构造基本没有影响,而SO42-和SiO32-在水样中的存在可使腐殖酸絮凝体尺寸增加0.05-0.13 mm左右,但结构比较开放松散,同时絮凝体的黏结力(即抗剪切力)大大削弱,降低了约0.018-0.047 N·m-2,并且SO42-对腐殖酸絮体构造的影响大于SiO32-对其的影响.然而,引入阳离子会对絮凝体的构造起到不同程度的改善作用.其中以Ca2+、Mg2+为代表的高价阳离子对絮凝体构造影响较大,形成的絮凝体结构密实,尺寸较大,抗剪切能力强.高价阳离子的存在会使絮凝体的粒径增加0.08-0.15 mm,抗剪切力增加0.002-0.013 N·m-2,而以K+、Na+为代表的低价阳离子对絮凝体构造的影响较小.
    Abstract: The influence of several typical chemical conditions on the structure characteristics of humic acid flocs was evaluated in this paper. The results indicate that flocs formed by co-precipitation at pH 5 with low dosage had a compact structure, high strength and uniform particle distribution. Flocs formed by adsorption and sweep flocculation at pH 5 with high dosage and pH 7 showed similar structure characteristics, with a large size, loose structure and lower strength. The effect of typical ions on floc structure was also analyzed and discussed. The results show that Cl- had little effect on floc structure, whereas SO42- and SiO32- existing in humic acid water samples lead to increased flocs size by 0.05-0.13 mm and a looser structure. Moreover, the bonding force of flocs was greatly weakened, and reduce by about 0.018-0.047 N·m-2. The influence of SO42- on floc structure was greater than that of SiO32-. However, dosing cations improvd floc structure to varying degrees. High valence cations such as Ca2+,Mg2+ had a notable effect on the floc structure. Flocs formed after dosing Ca2++Mg2+ were compact and large with a strong shearing resisting ability. They lead to increase of floc size and strength by 0.08-0.15mm and 0.002-0.013 N·m-2 respectively. The influence of low valence cations K+ +Na+ on floc structure was less.
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  • 收稿日期:  2012-08-22
冯永宁, 金鹏康, 王晓昌. 典型pH条件下水中离子对腐殖酸絮凝体构造的影响[J]. 环境化学, 2013, 32(6): 1088-1093. doi: 10.7524/j.issn.0254-6108.2013.06.026
引用本文: 冯永宁, 金鹏康, 王晓昌. 典型pH条件下水中离子对腐殖酸絮凝体构造的影响[J]. 环境化学, 2013, 32(6): 1088-1093. doi: 10.7524/j.issn.0254-6108.2013.06.026
shu
FENG Yongning, JIN Pengkang, WANG Xiaochang. Effects of ion in water on humic acid floc structure under typical pH conditions[J]. Environmental Chemistry, 2013, 32(6): 1088-1093. doi: 10.7524/j.issn.0254-6108.2013.06.026
Citation: FENG Yongning, JIN Pengkang, WANG Xiaochang. Effects of ion in water on humic acid floc structure under typical pH conditions[J]. Environmental Chemistry, 2013, 32(6): 1088-1093. doi: 10.7524/j.issn.0254-6108.2013.06.026
shu

典型pH条件下水中离子对腐殖酸絮凝体构造的影响

  • 1. 西安建筑科技大学环境与市政工程学院, 710055, 西安
  • 收稿日期:  2012-08-22
基金项目:

国家自然科学基金项目(50978211)资助.

摘要: 分析评价了几种典型化学条件对腐殖酸絮凝体构造的影响.研究结果表明,在pH=5.0低投药量下以共聚络合为主要混凝机理所形成的絮凝体结构密实,粒径分布均匀,强度大.而pH=5高投药量以及pH=7.0两种情况下的混凝机理都是以吸附和网扫絮凝为主,此时形成的絮凝体构造特征相似,尽管尺寸较大,但是结构松散,强度较小.针对水中常见的主量阴阳离子,分析探讨了典型离子对絮凝体构造特征的影响.研究表明,Cl-在腐殖酸水样中的存在对絮凝体构造基本没有影响,而SO42-和SiO32-在水样中的存在可使腐殖酸絮凝体尺寸增加0.05-0.13 mm左右,但结构比较开放松散,同时絮凝体的黏结力(即抗剪切力)大大削弱,降低了约0.018-0.047 N·m-2,并且SO42-对腐殖酸絮体构造的影响大于SiO32-对其的影响.然而,引入阳离子会对絮凝体的构造起到不同程度的改善作用.其中以Ca2+、Mg2+为代表的高价阳离子对絮凝体构造影响较大,形成的絮凝体结构密实,尺寸较大,抗剪切能力强.高价阳离子的存在会使絮凝体的粒径增加0.08-0.15 mm,抗剪切力增加0.002-0.013 N·m-2,而以K+、Na+为代表的低价阳离子对絮凝体构造的影响较小.

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