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《ACTA SCIENTIAE CIRCUMSTANTIAE》 1997-03
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DYNAMIC TRANSFORMATION AND STABILITY OF HYDROLYZED ALUM AND POLYALUMINUM IN THE COAGULATION AND FLOCCULATION PROCESSES

Luan Zhaokun, Tang Hongxiao, Yu Chenfei(State Key Laboratory of Aquatic Environmental Chemistry,Research Center for Eco Environmental Sciences,Chinese Academy of Sciences,Beijing 100085)  
Dynamic transformation and stability of alum(AC) and polyaluminum (PAC) in the coagulation and flocculation processes were studied by Al Ferron timed complex colorimetric method and electrophoretic mobility. The results showed that the hydrolyzed species of AC formed in the coagulation and flocculation processes were different from the polymerized species of PAC and their charge and size were lower than those of 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 of PAC 25 were relatively stable over pH ranges and the mixing time. Solubility studied showed that AC precipitation are able to be adequately described by amorphous Al(OH) 3 (s) solubility,but PAC 25 was retained upon precipitation and yielded a different network floc particle. It is also demonstrated that the superior Al 13 species did not appeared to be formed in the hydrolysis of alum during coagulation and flocculation processes because some special conditions were required for the formation of the Al 13 species.
【Fund】: 国家自然科学基金
【CateGory Index】: O614.31
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