【作者】 蔡忠；

【导师】 胡翔；

【作者基本信息】 北京化工大学 ， 环境科学， 2007， 硕士

【摘要】 金属聚硅酸复合型混凝剂是一类新型水处理药剂，它的研制与开发已成为无机高分子混凝剂研究中的前沿与重点。针对金属聚硅酸复合型混凝剂存在着有效成份含量较低、混凝效果及稳定性有待提高、混凝机理研究较少等问题，本论文从应用基础研究的角度对聚硅酸铁铝（PSFA）混凝剂进行了较为系统的研究，为该类型混凝剂向实用阶段发展提供理论依据。采用一步法制备PSFA混凝剂，考察了不同条件下制备的PSFA混凝剂的混凝性能，确定该混凝剂的最佳制备工艺条件为：常温，M（Fe₂SO₄+Al₂SO₄）=200g／L，（Fe+Al）：Si=5：1，Fe：Al=1：1，pH=2.0。在此条件下合成的PSFA混凝剂性能优良，贮存时间长。采用所制备的PSFA混凝剂模拟处理微污染水源水中微量有机污染物的去除效果，考察了混凝剂投加量、pH值等对去除效果的影响，确定了PSFA混凝剂的最佳处理条件。实验结果表明：聚硅酸铁混凝剂对有机物和浊度的去除效果明显优于硫酸铁、聚合硫酸铁。分析了PSFA混凝剂的电导率及铁和硅的形态分布，提出了PSFA混凝剂的混凝机理。更多还原

【Abstract】 Metal-polysilicate complex coagulant （MPS） is a new type of agent for water treatment. Its preparation and development have become the current focus and frontier of study on inorganic polymeric coagulants, and obtained wide attention at home and abroad. But, up to now, there are some unresolved problems for MPS’s productive application such as how to enhance the content of effective composition, the coagulation efficiency, prolong its storage time and explain its coagulation mechanism. This study was carried out systematically in basic research, which can provide the basis for polysilicate ferric aluminum PSFA practical use.Used one-step process to prepare the coagulant PSFA, then researched its coagulation performance prepared in different conditions so as to verify the optimal processing condition of this coagulant: natural temperature, M（Fe₂SO₄+Al₂SO₄）=200g/L, （Fe+Al）:Si=5:1 , Fe:Al=1:1 , pH=2.0. The coagulant prepared in this condition had excellent performance and can be stored for a long time.Used the prepared PSFA to simulate the removal effect in dealing with natural water contained little organic pollutants, and researched the influence of dosage of coagulant and pH to the removal effect, and verified the optimal treatment conditions. It showed by the results that PSFA had better removal effect of organics and turbidity than ferric sulfate and polymerized ferric sulfate.Analyzed the conductivity of PSFA and the morphogenetic contribution of ferri and silicon, and introduced its coagulation mechanism.更多还原