中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 14 No. 5 October 2004 |
（1. School of Construction, Guangdong University of Technology, Guangzhou 510643, China;
2. School of Municipal and Environment Engineering,
Harbin Institute of Technology, Harbin 150090, China）
Abstract:The relativity of coagulant dosage, residual turbidity, temperature, pH etc. with residual aluminum concentration were investigated, and several important conclusions were achieved. Firstly, dosage of alum-coagulant or PACl influences residual aluminum concentration greatly. There is an optimal-dosage-to-aluminum, a bit less than the optimal-dosage-to-turbidity. Secondly, it proposes that decreasing residual aluminum concentration can be theoretically divided into two methods, either decreasing (even removing) the concentration of particulate aluminum component, or decreasing dissolved aluminum. In these tests there is an optimal value of residual turbidity of post-precipitation at 7.0 NTU. Thirdly, residual aluminum level will increase while water temperature goes higher. At the last, optimal pH value corresponds a minimum dissolved aluminum at a given turbidity. Data shows the optimal pH value decreases with water temperature’s increasing.
Key words: drinking water; water treatment; residual aluminum; pH
