间歇喷淋营养液对生物滴滤塔净化甲苯的影响

为探索间歇喷淋营养液对生物滴滤塔的影响,以净化甲苯为研究对象,应用FX1N-14MR-001型可编程逻辑控制器(PLC),实现生物滴滤塔的间歇喷淋营养液操作,研究了环境温度、ρ(TN)、营养液喷淋密度和喷/停时间对净化甲苯能力的影响,并对机理进行了分析. 结果表明:当生物滴滤塔系统的气体停留时间为40.70s时,营养液最佳喷淋密度为4.5L/(m2·min),最佳喷/停时间为2min/4min. 当甲苯系统进口负荷小于88.29g/(m3·h)时,甲苯的去除率可达95.0%以上；当进口负荷为186.04g/(m3·h)时,甲苯的去除率为87.6%,系统对甲苯的最大去除能力由连续喷淋时的169.63g/(m3·h)升至248.85g/(m3·h). 

Influence of Nutrient Solution Intermittent Spraying Pattern on Biotrickling Filters for Toluene Degradation

Toluene was selected as the target compound to study the influence of nutrient solution intermittent spraying on the biological trickling filter. The FX1N-14MR-001Programmable Logic Controller (PLC) was used to control the intermittent nutrient spraying pattern on the biotrickling filters. The operation conditions including ambient temperature, concentration of total nitrogen, spraying density, spray/stop time and mechanism of the intermittent spraying biological trickling filter was studied. When gas residence time was set as 40.70s, the results showed that the optimum condition was controlled at the spraying density of 4.5L/(m2·min) and the spray/stop time of 2min/4min. When the toluene inlet loading rate was less than 88.29g/(m3·h), the removal efficiency was higher than 95.0%. While the toluene inlet loading rate was 186.04g/(m3·h), the removal efficiency was about 87.6%；the maximum elimination capacity of toluene increased from 169.63g/(m3·h) to 248.85g/(m3·h) compared with continuous spraying pattern.