摘要
以活性炭和焦化废水为例,将吸附废水尾水的粉末活性炭(PAC)分离,再吸附原水,从吸附过程和投加量考察COD的去除,运用GC/MS对吸附过程的微观组分进行解析,再进行燃烧热值测定.研究结果表明,针对尾水选择合适粉末活性炭,少量投加即可使出水COD达标排放;吸附尾水时主要去除生物系统难以降解的有机组分,再吸附原水时,对酚类物质、氮杂环化合物以及多环芳烃类都具有显著的效果,表现出非选择性,吸附过程完全受控于高浓度组分;单位废水可提供的热值Qw=(45.990±3.521)×Cm,吸附原水有机物的活性炭,其燃烧热值有显著提高,增量ΔQ由ΔQ=(45.990±3.521)×(Cm-Ce)×V决定.针对高浓度难降解的工业有机废水,上述工艺通过能源回收的方式可实现工程造价与运行费用的显著降低.
The application of activated carbon（AC） served as both adsorbent and fuel in the treatment of coking wastewater was investigated in this work.Powdered activated carbon（PAC） was firstly used for the adsorption of tail effluent,and then it was reused to treat the influent of coking wastewater.The adsorption processes were investigated by GC/MS,and the calorific value of saturated PAC was tested after the secondary adsorption.The results indicated that the effluent can meet the COD discharge standard with a small dose of PAC.The refractory compounds and long chain hydrocarbon compounds in tail effluent can be removed by adsorption.Moreover,phenols in coking wastewater were removed during the second adsorption process,suggesting that the removal efficiency of PAC was not affected.The calorific value of coking wastewater per unit mass can be calculated by equation of Qw=（45.990±3.521）×Cm.After adsorption,the calorific value of PAC increased and it was determined by：ΔQ=（45.990±3.521）×（Cm-Ce）×V.The energy recovery process can reduce the cost on project and operation for coking wastewater treatment.
出处
《环境化学》
CAS
CSCD
北大核心
2012年第10期1510-1517,共8页
Environmental Chemistry
基金
国家自然科学基金重点项目(21037001)
"十一五"国家科技支撑计划重点项目(2008BAC32B06-1)
国家高技术研究发展计划项目(2009AA06Z319)
华南理工大学中央高校基本科研业务经费(2011ZP0006)资助
关键词
活性炭
焦化废水
吸附
燃烧热
activated carbon
coking wastewater
adsorption
calorific value
