College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China.
College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China.
Bioresour Technol. 2019 Oct;289:121754. doi: 10.1016/j.biortech.2019.121754. Epub 2019 Jul 3.
Acetonitrile (ACN) is a very volatile, toxic and nitrogen-rich organic compound. To enhance ACN wastewater treatment, a novel hybrid membrane-aerated bioreactor (MAB) containing aerated and non-aerated zones was established. A polypropylene hollow fiber membrane module (HF) and a silicone rubber membrane module (SR) were separately used as the bubble-free aeration diffuser and the biofilm carrier, and the non-aerated zones of these two types of reactors were packed with ceramsite. When the influent ACN loading was 1.200 kg/m·d, under aeration pressures of 20 kPa in the HF-MAB and 40 kPa in the SR-MAB, ACN removal loadings of 1.116 kg/m·d and 1.004 kg/m·d, respectively, were achieved, and the TN (total nitrogen) removal loadings were 0.267 kg/m·d and 0.246 kg/m·d, respectively. In the MABs, different stratified biofilm structures of the two zones and the diffusion and counter-diffusion of oxygen synergistically promoted ACN degradation, nitrification and denitrification.
乙腈（ACN）是一种挥发性很强、毒性很大且富含氮的有机化合物。为了增强乙腈废水处理效果，构建了一种新型的含曝气区和非曝气区的混合膜曝气生物反应器（MAB）。分别使用聚丙烯中空纤维膜组件（HF）和硅橡胶膜组件（SR）作为无泡曝气扩散器和生物膜载体，这两种类型的反应器的非曝气区均填充陶粒。当进水 ACN 负荷为 1.200kg/m·d 时，在 HF-MAB 中曝气压力为 20kPa 和在 SR-MAB 中曝气压力为 40kPa 的条件下，分别实现了 1.116kg/m·d 和 1.004kg/m·d 的 ACN 去除负荷，以及 0.267kg/m·d 和 0.246kg/m·d 的总氮（TN）去除负荷。在 MAB 中，两个区的不同分层生物膜结构以及氧气的扩散和反扩散协同促进了 ACN 的降解、硝化和反硝化。
