湿式空气氧化法处理TNT红水的影响因素

Research on influencing factors of TNT wastewater treatment by wet air oxidation

使用湿式空气氧化技术与生物技术联合处理TNT精制阶段所产生的红水,研究了湿式空气氧化过程中反应温度、反应时间、初始压强和pH值对流出物的COD值与流出物可生化性的影响规律。研究结果表明,随着反应温度和反应初始压强的升高、反应时间的延长、催化剂投加量的增加和反应pH值的降低,出水COD值均有所下降。在温度为300℃、初始压强为14 MPa、反应时间为2 h、pH值为5.3、铁盐催化剂添加量为2 g的条件下,出水COD值为498 mg/L,COD去除率可达到99.27%。在温度为300℃、初始压强为11 MPa、反应时间为1 h、pH值为3、添加1 g铁盐催化剂的条件下:反应流出物的BOD5/COD值为0.301,此时可生化性已经得到很好改善。通过生物方法对反应流出物后续处理发现,湿式空气氧化技术处理TNT红水在反应温度300℃以上,反应流出物均可生物降解。

The wet air oxidation integrated with bio-treatment processes was used to treat the TNT redwater from the TNT purifying stage. WAO experiments were carried out under different temperatures, initial pressures, pH and reaction times, in order to optimize reaction conditions for the COD and biodegradability of the effluent. The results show that, the COD removal rate significantly increased with higher temperature, longer reaction time, higher initial pressure and lower pH. The COD of effluent is 498 mg/L and the removal of COD can achieve 99.27% when the reaction temperature, initial pressure, reaction time, pH, and quantity of ferric salt are 300℃ , 14 MPa, 2 h, 5.3, and 2 g, respectively. When the temperature, initial pressure, reaction time, pH, and quantity of ferric salt are chosen to be 300℃, 11 MPa, 1 h, 3, and 1 g, respectively, the BOD5/COD of effluent is 0. 301 , indicating that the biodegradability of the effluent is improved. According to the biological experiment, the WAO effluent of the TNT redwater treated with the reaction temperature higher than 300℃ is available for the secondary treatment using the biological method.