富含活性氯与Al13水处理药剂对铜氰络合物去除效能

含重金属铜离子与氰离子（CN）的络合物广泛存在于电镀、冶金等工业废水中，是一种较难处理的污染物。富含活性氯和Al13聚合体的水处理药剂（PACC）兼具氧化和絮凝效能，在处理含重金属氰络合物（Cu（CN）3]2-）废水方面具有良好的应用前景。研究PACC与Cu（CN）3]2-的反应计量学、动力学，考察了pH、反应时间和投药量等影响因素，确定PACC的最佳工作参数。结果表明，PACC可同时实现对CN的氧化和对Cu2＋的絮凝，有效去除水中cu（CN）3]2-使用PACC对Cu（CN）3]2-的无害化处置过程分为2个阶段：CN-首先被氧化成氰酸根（OCN）；然后OCN-被进一步氧化并生成碳酸氢根和氮气，同时所释放的游离态铜离子被絮凝去除。这2个阶段反应的最佳pH分别为11和8，去除1toolCu（CN）3]2-的最佳投药量为9．35molCl2的PACC；在此条件下反应43min后，其出水中CN-和Cu2＋的浓度均达到排放标准（GB21900—2008）要求。

Effective treatment of copper-cyanide complex by a novel water treatment reagent

Copper cyanide complexes （ Cu（CN） 3 ] 2- ） are produced in several types of industry that in- clude electroplating, mining, and they are difficult to be removed from wastewater. A novel water treatment reagent containing high content of active chlorine and All3 polymer （PACC） was prepared by electrochemical method. PACC has shown a promising potential for the removal of metal-cyanide complex due to the combined functions of oxidation and coagulation. In order to determine the optimal working conditions of PACC, stoichiometry and kinet- ics of the reaction between PACC and Cu （CN） 312- were investigated, and a series of experiments about pH value,reaction time and dosage effect were carried out. The results indicate that PACC is effective for the treat- ment of Cu（CN）3 ]2- through the oxidation of CN- by active chloride and the subsequent removal of Cu2＋ by coagulation with Al13 polymer. Two stages were carried out for the complete treatment of Cu （CN） 3 ] 2-. CN - was oxidized to OCN- in the first stage,then OCN- was further converted into carbonate and nitrogen and the liber- ated Cu2 ＋ was removed by coagulation in the second stage. The optimal pH values of these two-stages are pH 11. 0and pH 8.0,respectively. The optimal dosage is 9.35 mol C12PACC for the treatment of 1 mol Cu（CN）3 ]2-. The reaction time is about 43 minutes under these conditions and the concentration of cyanide and copper both meet the requirement of GB21900-2008.