生物滴滤塔净化苯乙烯废气的性能研究

Study on Performance of Biotrickling Filter on Purification of Styrene Waste Gas

针对生物滴滤塔降解苯乙烯废气停留时间过长、去除负荷较低等问题,采用立式生物滴滤塔对苯乙烯废气进行降解,主要探究气体进口浓度、停留时间(EBRT)、营养液温度、停滞期等因素对生物滴滤塔净化苯乙烯废气性能的影响。实验结果表明:苯乙烯气体入口浓度为450mg/m^3,营养液每小时喷淋量为90mL,停留时间超过23s的条件下,生物滴滤塔的总去除效率可达到90%以上;入口浓度为1 000mg/m^3以下,停留时间为47.70s的条件下,降解效率可达100%,去除负荷最高达101.51g/m^3·h。微生物群落分析表明:塔内上下两段微生物优势菌群类同,且各个优势菌群所占比例相差不大,塔内主要门水平优势菌群为Proteobacteria。此外,生物滴滤塔稳定运行223d,塔内生物量逐渐增高,pH值和压降没有明显变化,反应器运行性能良好。本次研究表明,采用生物滴滤塔降解苯乙烯废气有较好的效果,且可为工业上生物法降解苯乙烯废气提供基础数据参考。

In view of the problems of long empty bed residence time(EBRT) and low removal load of styrene waste gas by biotrickling filter,a vertical biotrickling filter was used to degrade styrene in this paper.The effects of gas inlet concentration,EBRT,nutrient solution temperature,stagnation period and other factors on the performance of styrene purification by biotrickling filter were studied.The results showed that the removal efficiency(RE) of the biotrickling filter could reach more than 90% when the inlet concentration of styrene was 450 mg/m^3,the spray volume of nutrient solution was 90 mL per hour and the EBRT was more than 23 s.When the inlet concentration was less than 1 000 mg/m^3 and EBRT was 47.70 s,the RE reached 100% and the maximum removal load reached 101.51 g/m^3·h.Microbial community structure analysis showed that the main bacterial strains were similar in the upper and bottom layers of the reactor,and the proportion of each dominant strain was not much different.The most dominant strain was Proteobacteria on the phylum level in the reactor.In addition,the reactor runned steadily for 223 d,the biomass in the reactor increased gradually,and the p H and pressure drop did not change significantly.This work showed that the biotrickling filter has a good effect on the degradation of styrene,and can provide basic data reference for industrial biodegradation of styrene.