石灰沉淀—浮选分离法回收废水中磷的研究

用模拟废水进行了石灰沉淀-浮选分离法回收废水中磷的研究。包括沉淀和浮选试验。沉淀试验的目的是确定用CaO调节pH值去除磷的最佳用量、氨氮和Mg^2＋的存在对磷沉淀效果的影响。通过添加CaO调节pH值沉淀废水中的磷，去除率可高达99．88％，再通过浮选的方法回收磷。浮选试验部分包括捕收剂种类、用量及调整pH值的试验，浮选的最佳条件是采用癸酸为捕收剂，浮出沉淀中磷的含量为11-16％、磷的浮选回收率为94．93％。

Recovery of Phosphorus from Wastewater by Using Lime Precipitation-air Flotation

The factors influencing the recovery of phosphorus from simulated wastewater by using lime precipitation-air floatation was studied.The experiments include precipitation test and flotation test.The aim of the precipitation test is to discover the best dosages of CaO which is used to remove phosphorus by changing the pH,the influence of NH_4~+ and Mg~(2+) present in the wastewater.The removal rate of phosphorus was up to 99.88%.The test of flotation included changing the kinds of collector,the dosages of collector and pH.The results of flotation experiments showed that there were some differences among the floatation process with different collectors.The flotation results by using capric acid as collector is the best.The grade of phosphorus in the floated precipitate is 11.16% and its recovery is up to 94.93%.