Cu(NO_3)_2在亚甲蓝湿式氧化处理中的应用

Application of Cu(NO_3)_2 in course of WAO disposing methylthionine chloride

用CWAO技术处理COD为2 000 mg/L的亚甲蓝水溶液。以Cu(NO3)2为催化剂,考察了催化剂投加量、反应温度、压力及进水pH值对亚甲蓝水样COD去除率、脱色率、出水pH值的影响。实验表明,亚甲蓝的氧化效率随催化剂投加量的增加,反应温度及压力的升高而升高。然而,综合考虑亚甲蓝的氧化效率、试剂费用、设备成本及能量消耗,实验确定Cu(NO3)2的投加量以Cu2+计为150 mg/L,反应温度及压力分别为200℃和2.0 MPa。在酸性进水条件下,COD去除率随进水pH值的降低而升高;而在碱性进水条件下,COD去除率随进水pH值的升高而升高。pH值按COD去除率由高到低的排列顺序是:3.87、11.23、5.507、.25、9.47,实验确定最佳进水pH值是3.87。在以上最佳的操作条件下,反应150 min,水样COD去除率达97.4%,脱色率达99.97%,出水pH值3.63。

The present paper aims to introduce the authors＇ investigation of methylthionine chloride watery solution with the COD value 2 000 mg/L disposed by CWAO technology by using Cu（NO3）2 as a catalyst. As is known, catalyst dosage, reaction temperature, pressure, and inflow water pH value all influence water sample COD removing rate, color removal rate and outflow water pH value. The resuits show that the oxidation efficiency of methylthionine chloride can be enhanced with the increase of the catalyst dosage, reactive temperature and pressure. However, when oxidation efficiency, reagent expense, equipment cost and energy consume can be taken into integrated account, the experiments ascertain that Cu（NO3）2 dosage is 150 mg/L （according to Cu^2＋ ） , reactive temperature is 200℃ , and pressure is 2.0 MPa. However, on the condition of acidity inflow water, COD removal rate may increase with the decrease of inflow water pH value. Whereas at the conditions of alkalescence inflow water, COD removing rate increase with the increase of inflow water pH value, pH value are arranged in COD removal rate high-low order： 3.87, 11.23, 5.50, 7.25, 9.47, and the experiments indicate that the best inflow water pH value is 3.87. At the best operation conditions, 150 minutes of experiment later, the water sample COD removal rate would reach 97.4%, the color removal rate can reach 99.97% , and the outflow water pH value is 3,63.