光催化与生物技术联用工艺处理油漆废气中试研究

Pilot-scale study of removal of paint waste gas by combined technique of photocatalysis with biotechnology

光催化与生物技术联用工艺用于油漆生产、加工过程有机废气的现场处理,中试实验结果表明:油漆生产、加工过程现场的主要污染物是甲苯、乙苯、间/对二甲苯和邻二甲苯等苯系物,浓度在27～55 mg/m3之间。单独使用光催化和微生物技术现场处理这些苯系物,其去除效率都不很高。虽然在中试开始阶段光催化对苯系物的平均去除效率达到了86.2%,在中试稳定期,光催化技术对苯系物的平均去除效率却只有67.6%,而生物滴滤床在成功挂膜之后对现场有机废气的平均去除效率也仅为67.5%。但是将这两种工艺联合使用之后,在中试稳定期该组合工艺对苯系物的平均去除效率可以达到99.2%。

Combined technique of photocatalysis with biotechnology was used for the on-site control of organic waste gas emitted from paint production and processing factory.The results showed that the main components of the waste gas were toluene,ethyl-benzene,m/p-xylene and o-xylene.The concentration of the waste gas was in the range of 27～55 mg/m3.The removal efficiencies of these waste gases were relatively low and not satisfied if photocatalytical technology or biotechnology alone was applied to pilot-scale treatment of the emission gases.The average removal efficiencies of VOCs for photocatalysis and biotechnology were only 67.6% and 67.5% respectively at the steady stage,although the average removal efficiency of VOCs on photocatalysis was about 86.2% at the initial stage.However,the average removal efficiency was 99.2% when two single technologies of photocatalysis and biotechnology were combined together.