Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), School of Environment, Tsinghua University, 100084, Beijing, People's Republic of China,
Appl Microbiol Biotechnol. 2014 Nov;98(22):9437-46. doi: 10.1007/s00253-014-5888-z. Epub 2014 Jul 9.
Biofilters treating high-concentration gaseous volatile organic compounds (VOC) can be subject to bed clogging induced by excess biomass accumulation. In this study, O3 was continuously injected into biofilters to control biomass. Its effects on the performance of the biofilters and on biomass accumulation were investigated. Four identical biofilters designed to treat gaseous toluene were operated for 70 days, and three of them were continuously injected with O3 at different concentrations (from 80 to 320 mg/m(3)). The results showed that continuous O3 injection could effectively keep the bed pressure drop stable and had no adverse effect on toluene removal when O3 concentrations were 180-220 mg/m(3). The maximum toluene elimination capacity of the four biofilters was 140 g-toluene/m(3)/h, and the bed pressure drop of the biofilter fed with 180-220 mg/m(3) O3 remained below 3 mmH2O/m throughout the operation period. The biomass accumulation rates of the three biofilters with O3 at 80-320 mg/m(3) were lowered by 0.15-0.25 g/L/day compared with the biofilter without O3. The decreases in biomass accumulation resulted in higher void fractions of the filter beds with O3 injection. Carbon balance analysis indicated that CO2 production had increased while biomass accumulation and leachate waste production decreased in response to O3 injection. Based on the experimental results, it was concluded here that continuous O3 injection can reduce increases in bed pressure effectively, preserve VOC removal capacity, and prevent production of extra leachate waste.
生物过滤器处理高浓度气态挥发性有机化合物（VOC）时，可能会因过量生物量积累而导致床层堵塞。本研究连续向生物过滤器中注入臭氧来控制生物量。考察了其对生物过滤器性能和生物量积累的影响。设计了四个相同的生物过滤器来处理气态甲苯，运行了 70 天，其中三个连续注入不同浓度的臭氧（80-320mg/m3）。结果表明，当臭氧浓度为 180-220mg/m3 时，连续臭氧注入可以有效地保持床层压降稳定，对甲苯去除没有不利影响。四个生物过滤器的最大甲苯去除容量为 140g-甲苯/m3/h，注入 180-220mg/m3 臭氧的生物过滤器的床层压降在整个运行期间保持在 3mmH2O/m 以下。与未注入臭氧的生物过滤器相比，注入臭氧（80-320mg/m3）的三个生物过滤器的生物量积累率降低了 0.15-0.25g/L/d。臭氧注入导致滤床的空隙率增加，从而减少了生物量的积累。碳平衡分析表明，随着臭氧的注入，CO2 的生成增加，而生物量的积累和渗滤液的产生减少。基于实验结果，得出结论：连续臭氧注入可以有效地降低床层压降，保持 VOC 去除能力，并防止产生额外的渗滤液废物。
