催化超临界水氧化对吡虫啉废水的脱氮效果研究

Removal of TN from Imidacloprid Wastewater by Catalytic Supercritical Water Oxidation Process

采用催化超临界水氧化(CSCWO)技术处理高氮、高有机物浓度的吡虫啉废水,考察了催化脱氮效果的影响因素以及催化剂流失情况。结果表明:升高温度能明显提高脱氮效率,当温度升至550℃时,对TN的去除率高达99.97%,出水TN值仅为3.08 mg/L;当分别以Cu(NO3)2、MnSO4、CuSO4作为均相催化剂时,CuSO4的催化脱氮效果最好;当以CuSO4为催化剂时,在14次的连续运行中,出水中均可检测到Cu2+,其中有6次出水中的Cu2+浓度超标,且Cu2+流失速率最高可达2.593 2 mg/s。

Catalytic supercritical water oxidation process was used to treat imidacloprid wastewater containing high nitrogen and high organic matter concentration. The factors influencing catalytic denitrification as well as the loss rate of catalyst and acceptable heavy metal concentrations were investigated. The results showed that high temperature could significantly improve the nitrogen removal rate. When temperature was 550℃, the removal rate of TN was 99.97% and the effluent TN concentration was only 3.08 mg/L. CuSO4 acted as a better catalyst than Cu （ NO3 ） 2 and MnSO4 for catalytic denitrifieation. When using CuSOg, copper iota was detected in all 14 effluent samples, and 6 of them exceeded the standards with the maximum loss rate of effluent copper ion as high as 2. 593 2 mg/s.