聚合铝的形态稳定性及其动电特性的研究

本文采用改进的Ａｌ－Ｆｅｒｒｏｎ快速测定法研究了混凝过程中铝盐与聚合铝水解形态的转化规律及稳定性，并对混凝反应过程中铝与聚合铝溶解－沉淀形态分布与理论溶解度进行了对比，同时采用流动电流技术直接测定了铝盐与聚合铝絮凝剂的荷电状况，最后对发生在混凝过程中铝与聚合铝最佳凝聚形态进行了讨论。

SPECIES STABILITY AND ELECTROKINETIC CHARACTERISTICS OF POLY ALUMINUM CHLORIDE IN COAGULATION AND FLOCCULATION PROCESSES

Species stability and electrokinetic characteristics of polyaluminum chloride (PAC) in the coagulation and flocculation processes were studied by Al-Ferron timed complex colorimetric method and streaming current. Results show that hydrolyzed species of traditional coagulants (AC) formed in the coagulation and flocculation processes were different to the polymerized species of PAC. whether to charge or size were lower than the PAC. The hydrolyzed species of AC were unstable and depended upon the coagulation conditions such as concentration, pH and mixing time. On the contrary, the polymeric species in PAC were relatively stable over pH ranges and the mixing time. Solubility studied showed that AC precipitation is adequately described by amorphous A1(OH)3 (s) solubility, but PAC is retained upon precipitation and yields a different floe particle. It is also demonstrated that the superior Al13 species seems not to form in the hydrolysis of alum under coagulation and flocculation processes because some special conditions are required for the formation of the A113 species.