| Study on coagulation property of metal-polysilicate coagulants in low turbidity water treatment |
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| 作者姓名： | 杨海燕 崔福义 赵庆良 马超 |
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| 基金项目： | Project (No. E9825) supported by the Natural Science Foundation of Heilongjiang Province,China |
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| 摘 要： | INTRODUCTION Coagulation-flocculation is a major step inthe potable water treatment for removal of colloi-dal impurity. Due to the increase of water pollu-tion, the standards of drinking water supply andwastewater discharge are becoming more and morestringent, and chemical coagulants that are moreefficient in water treatment are more and moreurgently in demand. As well known, the residual Al in potablewater comes from three main sources: natural wa-ter-body, coagulants used in…
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Study on coagulation property of metal-polysilicate coagulants in low turbidity water treatment |
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| YANG Hai-yan,CUI Fu-yi,ZHAO Qing-liang,MA Chao.Study on coagulation property of metal-polysilicate coagulants in low turbidity water treatment[J].Journal of Zhejiang University Science,2004(6). |
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| Authors: | YANG Hai-yan CUI Fu-yi ZHAO Qing-liang MA Chao |
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| Abstract: | In order to remove the low turbidity present in surface water, a novel metal-polysilicate coagulant was used to treat the raw water taken from Tanjiang River in Guangdong Province. This study on the effects of Al/Fe molar ratio on the performance of a complex compound formed by polysilicic acid, aluminium and ferric salt (PAFS) showed that PAFS with Al/Fe ratio of 10:3 seemed to have the best coagulation performance in removing turbidity and color. Experimental results showed that under the conditions of polymerization time of 15 d, sedimentation time of 12 min, and pH of 6?8, PAFS with Al/Fe molar ratio of 10:3 had the best coagulation efficiency and lowest residual Al concentration. The turbid- ity decreased from 23.8 NTU to 3.23 NTU and the residual Al concentration was only 0.165 mg/L in the product water. It could be speculated that colloidal impurities and particulate Al were removed by adsorption bridging and electrical neu- tralization of long chain inorganic polymer coagulants. |
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| Keywords: | Potable water treatment Metal-polysilicate coagulant Coagulation property Residual aluminum |
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