厌氧/特异性移动床生物膜反应器处理焦化废水

采用厌氧/特异性移动床生物膜反应器(AMBBR/SMBBR)工艺对焦化废水进行生物降解,在单因素实验基础上,通过基于Box-Behnken设计的响应面法对SMBBR实验参数进行优化,并采用气相色谱-质谱(GC/MS)检测各单元废水中有机组分变化,探究有机污染物降解机理。结果表明,工艺运行参数在DO的质量浓度为5 mg/L、pH为8、HRT为5 d时处理效能最高,COD去除率达84.51%。系统中污染物降解过程服从一级反应动力学关系,污染物降解效率明显优于传统活性污泥法。AMBBR可通过厌氧消化有效降解酚类、喹啉和吲哚等有机物;SMBBR中好氧曝气能够进一步降解2,2,4,4,6,8,8-七甲基壬烷、丁酸乙酯、苯甲酸乙酯和苯酚等有机污染物。A/SMBBR组合工艺为焦化废水的高效处理提供了新方案。

Treatment of Coking Wastewater by Anaerobic/Specific Moving Bed Biofilm Reactor

Anaerobic/specific moving bed biofilm reactor(A/SMBBR)process was used to biodegrade coking wastewater.On the basis of single factor test,the SMBBR test parameters were optimized by response surface method based on Box-Behnken design.The changes of organic components in wastewater of each unit were detected by gas chromatography/mass spectrum(GC/MS)to explore the degradation mechanism of organic pollutants.The results showed that,when the process operating parameters of DO mass concentration was 5 mg/L,pH was 8 and HRT was 5 d,the treatment efficiency was the highest and the COD removal rate was 84.51%.The pollutant degradation process in this system obeyed the first-order reaction kinetic relationship,and the pollutant degradation efficiency was significantly better than the traditional activated sludge method.AMBBR could effectively degrade organic substances such as phenols,quinolines and anthraquinones by anaerobic digestion;Aerobic aeration in SMBBR could further degrade organic pollutants such as 2,2,4,4,6,8,8-heptamethylnonane,ethyl butyrate,ethyl benzoate and phenol.The A/SMBBR combined process provided a new solution for the efficient treatment of coking wastewater.