Effects of raw water conditions on solution-state aluminum speciation during coagulant dilution

被引：41

作者：

Exall, KN ^{[1
]}

vanLoon, GW ^{[1
]}

机构：

[1] Queens Univ, Dept Chem, Kingston, ON K7L 3N6, Canada

来源：

WATER RESEARCH | 2003年 / 37卷 / 14期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Al-27; NMR; alum; prehydrolyzed coagulants; temperature; sulfate; organic matter;

D O I：

10.1016/S0043-1354(03)00229-X

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The speciation of aluminum in solutions of alum and various prehydrolyzed, aluminum-based water treatment coagulants was investigated by Al-27 NMR at 5degreesC and 25degreesC. Alum solutions were seen to contain only mononuclear species including an AlSO4+ complex, while the prehydrolyzed coagulant solutions contained polynuclear aluminum species, as well. The relative proportions of both polynuclear species and AlSO4+ complex decreased in cold water. The presence of organic matter had little effect on the speciation of aluminum in diluted alum, but markedly reduced the relative proportion of the tridecamer species in the prehydrolyzed coagulant solutions. The relationship between Al speciation in the coagulants and organic matter removal during jar tests was considered, and the possible role of sulfate in both the formation of the tridecamer species and the effect of organic matter on coagulation efficiency was discussed. Crown Copyright (C) 2003 Published by Elsevier Science Ltd. All rights reserved.

引用

页码：3341 / 3350

页数：10

共 21 条

[1] AL-27 NUCLEAR MAGNETIC-RESONANCE STUDIES OF HYDROLYSIS AND POLYMERIZATION OF HEXA-AQUO-ALUMINUM(III) CATION [J].