| 紫外辐射对腐殖酸溶液理化性质及其混凝性能的影响 |
| 摘要点击 2154 全文点击 1227 投稿时间：2015-09-10 修订日期：2015-10-26 |
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| 中文关键词 紫外辐射 腐殖酸 混凝 理化性 溶液 |
| 英文关键词 UV radiation humic acid coagulation physicochemical properties solution |
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| 中文摘要 |
| 为探明紫外辐射对腐殖酸溶液在后续混凝过程的促进原理,系统考察了紫外辐射对腐殖酸溶液理化性质的影响规律,以及这些理化性质上的变化对腐殖酸混凝性能的影响. 结果表明,经紫外辐射处理后,除Zeta电位外,腐殖酸溶液的pH、色度和黏度均呈现不同程度的下降趋势. 进一步研究发现,黏度对腐殖酸溶液的混凝效果影响相对较弱. 酸性条件下,腐殖酸溶液的混凝性能明显增加. Zeta电位的增加使得胶体之间更易聚集沉淀. 此外,除了相对分子质量为10×103~30×103和小于1×103的腐殖酸所占比例增加外,低分子量腐殖酸所占比重也无明显改变,这可能是紫外辐射后腐殖酸溶液混凝性能不降反增的重要原因. |
| 英文摘要 |
| To investigate the mechanism of UV light in promoting the removal of humic acid (HA) by coagulation, the variations of the physical and chemical properties of the HA solution before and after UV light radiation were investigated. The effects of the changes in water quality conditions on the removal performance of HA in coagulation were also observed. Experimental results showed that except zeta potential, pH, chromaticity and viscosity of the HA solution exhibited varying degrees of decline after UV radiation. Further study showed that the impact of changes in viscosity of the solution on humic acid coagulation performance was relatively small. Under acidic conditions, the coagulation performance of HA significantly increased. The increase of zeta potential led to easy gathering of colloidal particles and improved the coagulation performance. Furthermore, except for HA with relative molecular mass of between (10-30)×103 and less than 103, there was little variation in the proportion of low molecular weight HA, which may be an important reason that the coagulation performance of the humic acid solution increased after UV radiation. |
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