摘要
针对煤气化废水毒性大、难处理等问题，提出了一种热降解的处理方法．采用携带流反应实验系统，研究了温度、气氛、氧体积分数、停留时间等因素对废水中污染物热降解特性的影响．实验结果表明，温度对废水中COD和NH3-N的降解最为显著，在400-600 ℃温度范围内，降解速率最大．COD和NH3-N在不同气氛下的降解率依次为：氧化性＞惰性＞还原性．随着氧体积分数的增大，降解率随之增加．除此以外，废水在炉内停留的时间越长，污染物的去除效果越明显．
Considering the problems of high toxicity and intractable thermal degradation of gasification wastewater,a novel approach was proposed based on pyrolysis and combustion. In an entrained flow reactor system,the effects of temperature,atmosphere,oxygen concentration and residence time on the thermal degradation characteristics of contaminants in wastewater were investigated. The analysis results show that temperature is the most sigificant factor in COD and NH3-N thermal degradation,and the maximum degrading rates is within the range of 400 ℃ to 600 ℃. COD and NH3-N thermal degradation rankings under different atmospheres are as follows：oxidative〉inert〉reductive. As the oxygen concentraiton increases,the thermal degradation effi-ciency is improved. The longer wastewater remains in the reactor,the better the effect of contaminants removal will be.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2015年第3期224-228,共5页
Journal of Combustion Science and Technology
关键词
煤气化废水
热解
燃烧
降解
gasification wastewater
pyrolysis
combustion
degradation
