臭氧催化氧化处理造纸厂二级生物处理出水

Ozone Catalytic Advanced Oxidation Technology for Secondary Effluent of Paper-making Mill

中文关键词:  臭氧  催化氧化  造纸废水  COD_Cr

Key Words:ozone  catalytic oxidation  papermaking wastewater  COD_Cr

中文摘要:

      利用臭氧氧化法对造纸厂二级生物处理出水进行深度处理，考察了臭氧发生量、反应时间、反应温度、废水pH值、废水循环速率对造纸废水色度和COD_Cr去除率的影响，得出最优的臭氧氧化工艺；在此基础上，采用以不同金属盐为前驱体、掺氮活性炭（AC）为载体的催化剂对废水进行臭氧催化氧化处理。结果表明，在臭氧发生量为3 g/h、反应时间40 min、反应温度为40℃、pH值为原废水pH值、废水循环速率为500 mL/min的条件下，臭氧氧化法可将废水色度降至5 C.U.以下，COD_Cr去除率为86.9%；在多种催化剂中，镍基催化剂（Ni@AC）协同臭氧催化氧化可使废水COD_Cr去除率达91.7%。

Abstract:

      The secondary effluent from paper-making mill was sufficiently treated by ozone oxidation method. The effects of ozone intake， reaction time， reaction temperature， and pH value and circulation speed of wastewater on colority and COD_Cr removal rate of wastewater were investigated and the optimum process conditions were obtained. Based on which， a series of catalysts with different metal salts as precursors and N-doped activated carbon as carriers were used in the ozone catalytic oxidation. The results showed that under the optimal process conditions （ozone intake 3 g/h， reaction time 40 min， reaction temperature 40°C， initial pH value， and cycle speed 500 mL/min）， the colority of wastewater was reduced to <5 C.U.， COD_Cr removal rate was 86.9%. Of all the above-mentioned catalysts， COD_Cr removal rate of Ni@AC reached 91.7% due to its synergistic effect with ozone oxidation during wastewater treatment.