School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316004, China; College of Environment, Zhejiang University of Technology, Hangzhou 310032, China.
School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316004, China; Zhejiang Provincial Key Laboratory of Petrochemical Pollution Control, School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316004, China; National-Local Joint Engineering Laboratory of Harbor Oil & Gas Storage and Transportation Technology, School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan, 316022, China.
J Environ Manage. 2022 Oct 1;319:115610. doi: 10.1016/j.jenvman.2022.115610. Epub 2022 Jul 4.
Solid non-aqueous phases (NAPs), such as silicone rubber, have been used extensively to improve the removal of volatile organic compounds (VOCs). However, the removal of VOCs is difficult to be further improved because the poor understanding of the mass transfer and reaction processes. Further, the conventional reactors were either complicated or uneconomical. In view of this, herein, an airlift bioreactor with silicone rubber was designed and investigated for dichloromethane (DCM) treatment. The removal efficiency of Reactor 1 (with silicone rubber) was significantly higher than that of Reactor 2 (without silicone rubber), with corresponding higher chloride ion and CO production. It was found that Reactor 1 achieved a much better DCM shock tolerance capability and biomass stability than Reactor 2. Silicone rubber not only enhanced the mass transfer in terms of both gas/liquid and gas/microbial phases, but also decreased the toxicity of DCM to microorganisms. Noteworthily, despite the identical inoculum used, the relative abundance of potential DCM-degrading bacteria in Reactor 1 (91.2%) was much higher than that in Reactor 2 (24.3%) at 216 h. Additionally, the silicone rubber could be automatically circulated in the airlift bioreactor due to the driven effect of the airflow, resulting in a significant reduction of energy consumption.
固态非水相（NAPs），如硅橡胶，已被广泛用于提高挥发性有机化合物（VOCs）的去除率。然而，由于对传质和反应过程的理解不足，VOCs 的去除率难以进一步提高。此外，传统的反应器要么复杂，要么不经济。鉴于此，本文设计并研究了一种带有硅橡胶的气升式生物反应器，用于处理二氯甲烷（DCM）。装有硅橡胶的反应器 1 的去除效率明显高于未装硅橡胶的反应器 2，相应的氯离子和 CO 产量也更高。结果发现，反应器 1 比反应器 2 具有更好的 DCM 抗冲击能力和生物量稳定性。硅橡胶不仅增强了气/液和气/微生物相的传质，而且降低了 DCM 对微生物的毒性。值得注意的是，尽管使用了相同的接种物，但在 216 小时时，反应器 1 中潜在的 DCM 降解菌的相对丰度（91.2%）明显高于反应器 2（24.3%）。此外，由于气流的驱动作用，硅橡胶可以在气升式生物反应器中自动循环，从而显著降低了能耗。
