| 引用本文: | 杨蕤,刘国,黄艳采,张琪琪,徐芬,廖兵,刘静.硫铝酸盐水泥去除微污染水体中磷的性能及机理.湖泊科学,2022,34(3):828-842. DOI:10.18307/2022.0310 |
| Yang Rui,Liu Guo,Huang Yancai,Zhang Qiqi,Xu Fen,Liao Bing,Liu Jing.Performance and mechanism of phosphorus removal from micro-polluted water by sulfoaluminate cement. J. Lake Sci.2022,34(3):828-842. DOI:10.18307/2022.0310 |
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| 硫铝酸盐水泥去除微污染水体中磷的性能及机理 |
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杨蕤1,2, 刘国1,2,3, 黄艳采1,2,4, 张琪琪1,2, 徐芬1,2,3, 廖兵1,2,3, 刘静1,2,3
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1.成都理工大学生态环境学院, 成都 610059;2.国家环境保护水土污染协同控制与联合修复重点实验室(成都理工大学), 成都 610059;3.地质灾害防治与地质环境保护国家重点实验室(成都理工大学), 成都 610059;4.贵州省地质矿产勘查开发局一○四地质大队, 贵阳 558000
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| 摘要: |
| 微污染湖泊、水库等水体中磷的去除已成为水质研究的主要方向.磷是造成水体富营养化的关键因素，其浓度较低时即可导致水体富营养化与水华的发生，许多除磷方法对低浓度磷的去除效果不佳.因此，我们从22种天然矿物、火山灰质材料和水硬性材料中，筛选出了能高效去除低浓度磷的硫铝酸盐水泥（代号R.SAC 42.5，简称R），该材料在中性、偏酸性的溶液中呈絮凝体状态.本文从吸附动力学、等温吸附曲线、SEM和XRD分析3个方面研究了R对微污染水体中磷的去除机理、环境因素（pH、温度、光照、扰动和溶解氧浓度）对已被R絮凝体吸附的磷酸盐再次溶出的影响以及R在实际微污染水体中的应用效果.结果表明，中性条件下，R絮凝体在0.5 min内就可完成对磷酸盐的去除.当R絮凝体用量为0.10 g/L时，可将0.10 mg/L的磷酸盐完全去除.初步分析表明，磷的去除是由于R絮凝体与磷酸盐之间的化学吸附作用，吸附初始反应阶段可由Langmuir等温线描述.SEM和XRD分析表明磷酸盐主要吸附在R中的硅酸三钙表面，絮凝后的R通过溶液中离子的网捕、压缩、沉降增加了磷酸盐吸附量.环境因子实验表明，在pH为5.0~8.0范围内，磷酸盐去除率可达90%以上.光、温度和溶解氧不影响磷酸盐的去除.扰动会导致部分磷酸盐解吸，但磷酸盐浓度仍低于0.05 mg/L.对微污染湖泊/水库除磷研究表明，絮凝后的R在湖泊/水库除磷、截留水中悬浮物、预防水体富营养化与水华方面具有潜在的应用前景. |
| 关键词: 微污染水体|硫铝酸盐水泥|低浓度磷|除磷机制|吸附 |
| DOI：10.18307/2022.0310 |
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| 基金项目:2019年四川省环境治理与生态保护重大科技专项（2019YFS0504）、2019年四川省重点研发项目（2019YFS0055）、2020年四川省级大学生创新创业训练计划项目（S202010616147X）、成都理工大学科研启动基金项目（10912-KYQD-06887）和成都理工大学中青年骨干教师发展计划项目（10912-JXGG2020-06887）联合资助. |
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| Performance and mechanism of phosphorus removal from micro-polluted water by sulfoaluminate cement |
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Yang Rui1,2, Liu Guo1,2,3, Huang Yancai1,2,4, Zhang Qiqi1,2, Xu Fen1,2,3, Liao Bing1,2,3, Liu Jing1,2,3
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1.College of Environment and Ecology, Chengdu University of Technology, Chengdu 610059, P. R. China;2.State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution (SEKL-SW), Chengdu University of Technology, Chengdu 610059, P. R. China;3.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, P. R. China;4.104 Geological Brigade of Guizhou Geological and Mineral Exploration and Development Bureau, Guiyang 558000, P. R. China
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| Abstract: |
| The removal of phosphorus from micro-polluted lakes, reservoirs and other water bodies has become a main direction of water quality research. Phosphorus is a key factor in the eutrophication of water bodies and can easily lead to eutrophication and algae bloom even at low concentrations. Many phosphorus removal methods are not effective in removing low concentrations of phosphorus. Therefore, out of 22 natural minerals, volcanic ash materials and water-hardened materials, we selected sulfoaluminate cement (code R-SAC 42.5, abbreviated R), which can effectively remove low concentrations of phosphorus. This material is flocculated in neutral and slightly acidic solution. Based on the adsorption kinetics, isothermal adsorption curves, and SEM and XRD analyses, we investigated the mechanism of phosphorus removal from micro-polluted water, the effects of environmental conditions (pH, temperature, light, perturbation and dissolved oxygen) on the re-solubilization of phosphate already adsorbed by the R floc, and the effect of R on phosphorus in real micro-polluted water. The results showed that under neutral conditions, the R floc could completely remove phosphate within 0.5 min. Phosphate (0.10 mg/L) could be completely removed by 0.10 g/L R floc. Preliminary analysis showed that the removal of phosphorus was due to chemisorption between the R floc and phosphate, and the initial stage of adsorption could be described by the Langmuir isotherm. SEM and XRD analyses showed that phosphate was mainly adsorbed on the tricalcium silicate surface in R. The flocculated R increased phosphate adsorption through the net capture, compression, and precipitation of ions in solution. More than 90% of the phosphate could be removed at pH 5.0-8.0. Light, temperature, and dissolved oxygen did not affect the phosphate removal. Disturbance resulted in partial desorption of phosphate, but the phosphate concentration remained below 0.05 mg/L. The application to a real micro-polluted lake/reservoir showed that flocculated R can be used to control phosphate levels in lakes and reservoirs by removing phosphate, trapping the suspended matter and preventing from eutrophication and algae bloom in the water. |
| Key words: Micro-polluted water|sulfoaluminate cement|low-concentration phosphorus|phosphorus removal mechanism|adsorption |
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