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篇目详细内容 |
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【篇名】 |
Effects of humic acid on residual Al control in drinking water treatment plants with orthophosphate addition |
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【刊名】 |
Frontiers of Environmental Science and Engineering |
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【刊名缩写】 |
Front.Environ.Sci.Eng. |
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【ISSN】 |
2095-2201 |
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【EISSN】 |
2095-221X |
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【DOI】 |
10.1007/s11783-012-0422-y |
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【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
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【出版年】 |
2012 |
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【卷期】 |
6
卷4期 |
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【页码】 |
470-476
页,共
7
页 |
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【作者】 |
Wendong WANG;
Hua LI;
Zhenzhen DING;
Xiaochang WANG;
Rui LIU;
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【关键词】 |
coagulation; drinking water; humic acid; orthophosphate; residual Al |
【摘要】 |
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This study aimed to investigate the effects of humic acid (HA) on residual Al control in drinking water facilities that used orthophosphate addition. The results showed that adding orthophosphate was an effective method for residual Al control for the raw water without HA. When orthophosphate was added at 1.0？min before the addition of poly aluminum chloride (PACl), the concentrations of soluble aluminum (Sol-Al) and total aluminum (Tot-Al) residue were 0.08 and 0.086？mg·L？1, respectively; both were reduced by 46% compared with the control experiment. The presence of HA would notably increase the residual Al concentration. For the raw water with 5 mg·L？1 of HA, the concentrations of Sol-Al and Tot-Al increased from 0.136 and 0.174？mg·L？1 to 0.172 and 0.272？mg·L？1, respectively. For water with a HA concentration above 5？mg·L？1, orthophosphate was ineffective in the control of residual Al, though there were still parts of orthophosphate were removed in coagulation. The amounts of Al removal were positively correlated with the solids freshly formed in coagulation. Similar to the raw water without HA, the best Al control was obtained with orthophosphate salt added at 1.0？min before PACl. HA concentrations in the raw water, solution pH, and the orthophosphate dosage suitable for residual Al control by orthophosphate precipitation were also investigated. |
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