| 聚合铝的水解形态对混凝过程中磷分布转化的影响 |
| 摘要点击 1550 全文点击 1258 投稿时间：2010-01-17 修订日期：2010-05-09 |
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| 中文关键词 混凝 碱化度 磷 分布 |
| 英文关键词 coagulation basicity phosphorus distribution |
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| 中文摘要 |
| 用碱化度不同的混凝剂对水体进行混凝处理，对混凝前后水体中磷的含量、形态分布以及藻类可利用性等进行了研究.结果表明，不同碱化度的混凝剂除磷效果不同，对水体中磷形态分布的影响差别显著；Ala在混凝剂去除磷实验过程中起重要作用，碱化度越低的混凝剂除磷率越高，PACl0除磷效果最好.随着混凝剂（PACl0）投量的增加，水体中溶解态磷及颗粒态磷逐渐减少，当混凝剂含量超过一定剂量（10 mg·L-1）时，水体中的溶解态磷及颗粒态磷都沉入底泥.浊度控制和除磷所需混凝剂投量不一致，控制浊度时混凝剂投量3～5 mg·L-1效果最好，但理想的总磷去除率要求更高的混凝剂投量.底泥中藻类可利用磷（algal available phosphorus，AAP）的量随混凝剂（PACl0）投量的增加呈现先升后降的变化，在5 mg·L-1前AAP随混凝剂投量的增加逐渐增加；当超过5 mg·L-1时，AAP随混凝剂投量的增加而减少.投加过量（相对除浊要求）的混凝剂可以抑制底泥磷被生物利用，对长效控磷有重要意义.混凝除磷时混凝剂投量不能以浊度去除率为唯一标准，而应参考总磷去除率和底泥藻类可利用磷等磷释放控制的要求，使用较大的投量. |
| 英文摘要 |
| Coagulation treatment was conducted by using coagulants of different basicity (ratio of OH-/Al);contents，distributions and algal availability of phosphorus in water were studied before and after coagulation. Results show that：phosphorus removals and its distribution in water were markedly different according to the coagulant with different basicity used;Ala plays an important role in the coagulation experiment for P removal. The lower the coagulant basicity was，the higher phosphorus removal was achieved;and PACl0 showed the best performance. Dissolved and particulate phosphorus reduced gradually with the increase of the coagulant (PACl0).They were entirely turned into deposit phosphorus when the coagulant dosage was above 10 mg·L-1. The demand of coagulant for turbidity control was proved to be unequal to that for phosphorus removal. The coagulant dosages of about 3-5 mg·L-1 achieved the best turbidity removal in the experiment;while much higher dosage was needed to get desired phosphorus removal. The amount of AAP (algal available phosphorus) in the sediments changed according to coagulant (PACl0) dosages. AAP increased with the increase of coagulant dosage when the dosage was less than 5 mg·L-1，then it decreased with further addition of coagulant above 5 mg·L-1. It was proved that release of phosphorus in sediments would be controlled effectively by addition of coagulant overdosed compared to the need for turbidity removal，which is important to long-term control of phosphorus. It was indicated that the dosage of coagulant used for phosphorus removal can not use the sole criterion for turbidity removal;the need for total phosphorus removal，sediment release of available phosphorus (such as AAP) and other phosphorus control requirements should be considered;and a larger dosage would be needed. |
