用石灰和肥皂泡沫浮选处理含重金属离子废水的探讨 Ⅰ.含CO^(2+)、Pb^(2+)、Cd^(2+)、Cu^(2+)、Zn^(2+)废水

Study on the Separation of Heavy Metal Ions in Wastewater by Floatation Method Using Lime and Soap Ⅰ.For the Wastewater Containg Co^(2+),Pb^(2+),Cd^(2+),Cu^(2+),Zn^(2+)

目前,系统分析和系统工程已成为当前环境保护领域中的重要研究课题之一.在各种环境污染中,重金属污染对人类健康造成的危害是很大的.为此,国内外对治理重金属废水做了大量的研究工作.到目前为止,已经提出了许多种对重金属废水处理的方法和技术,如:沉淀法、铁氧体法、浮选法、隔膜电解法以及反渗透、电渗析和离子交换法等.这些方法虽然各有其优点,但也都程度不同地存在一些缺点。

A new method has been established for the separation of heavy metal ions(Co^(2+),Pb^(2+),Cd^(2+),Cu^(2+),Zn^(2+))from wastewater by floatation method using a smallquantity of lime and soap.In this floatation process,numerous bubbles carryingthe precipitate have thus been formed the upper layer.The precipitates havebeen found to contain heavy metal ions as expected.Various factors whetherphysical or chemical which affect the floatation mentioned above have also beenstudied.The optimun condition of such separation method for test solutiou of differentconcentration from 1,10 or 30 ppm of a single ion or mixed ions respectivelyhave been obtained,such condition are:The acidity of test solution is pH>3;a sintered—glass disc(№5)is used for gas dispenser;air flow rate is 100ml/min;the bubbling time is 5 min.;200～250 mg or 400mg of lime and 20ml or 40ml of 1%soap solution.In this way,the maximum quantity of heavy metal ions have beenrecovered.Ionic strength little effect on the process.