过氧化钙的常温水相法合成及其在废水处理中的应用试验研究(英文)

Synthesis of CaO_2 in Aqueous at Room Temperature and Its Application in Waste water Treatment

以Ca(OH)_2和H_2O_2为原料,通过添加稳定剂,实现了过氧化钙的常温水相合成。在此基础上,研究了其在废水处理中的应用。采用硫酸亚铁催化—过氧化钙氧化法对染料废水进行了处理实验研究。结果表明:染料的脱色率与CaO_2用量、FeSO_4·7H_2O用量、反应时间均有关系。在本试验确定的最佳处理条件下,染料的脱色率均能达到100％,且COD去除率达90％以上。利用过氧化钙的碱性及氧化性,对Cd^(2+)、Pb^(2+)、Cu^(2+)、Mn^(2+)、AsO_2^-等重金属废水进行处理,结果表明:通过控制过氧化钙的加入量及pH值,这几种重金属离子的去除率均达到99.9％以上,残留浓度均低于国家排放标准。由此可见,过氧化钙是一种有效、安全、无毒的“环境友好型”绿色水处理剂。

In this paper, peroxide calcium (CaQ2) was synthesized at room temperature from industrial Ca(OH)2 and H2O2 with the addition of stabilizer, the purity of the product is over 70%. On this basement, the application of CaO2 in the treatment of wastewater was studied. (1) The treatment of dye wastewater by FeSO4 catalysis-CaO2 oxidation process. The results show that this process is effective to the decolorization of some kinds of dyes. Moreover, the decolorizing rate is related to the quantity of CaO2, the quantity of FeSO4 and the reaction time. At the optimum condition decided by the experiment, the decolorizing rate can reach to about 100%, CODcr removal efficiency is more than 90% . (2) The treatment of wastewater containing heavy metals Cd2+, Pb2+ , Cu2+ , Mn2+ , AsO2- using alkalescence and oxidation of CaO2. The results show that the residual concentration of Cd2+ , Pb2+, Cu2+ , Mn2+ , AsO2- is less than the emission standard set down by country, and removal efficiency of heavy metals is more than 99.9% . Therefore, CaO2 is an effective, safe, nontoxic, environmental friendly green water-treatment reagent.