Department of Environmental Engineering, College of Life and Environmental Science, Shanghai Normal University, Shanghai, 200234, People's Republic of China.
Appl Microbiol Biotechnol. 2010 May;86(6):1977-85. doi: 10.1007/s00253-010-2458-x. Epub 2010 Feb 23.
An integrated photocatalytic-biological reactor (IPBR) was developed for accelerated phenol degradation and mineralization. In the IPBR, photodegradation and biodegradation occurred simultaneously, but in two separated zones: a piece of mat-glass plate coated with TiO(2) film and illuminated by UV light was connected by internal circulation to a honeycomb ceramic that was the biofilm carrier for biodegradation. This arrangement was designed to give intimate coupling of photocatalysis and biodegradation. Phenol degradation was investigated by following three protocols: photocatlysis with TiO(2) film under ultraviolet light, but no biofilm (photodegradation); biofilm biodegradation with no UV light (biodegradation); and simultaneous photodegradation and biodegradation (intimately coupled photobiodegradation). Photodegradation alone could partly degrade phenol, but was not able to achieve significant mineralization, even with an HRT of 10 h. Biodegradation alone could completely degrade phenol, but it did not mineralize the COD by more than 74%. Photobiodegradation allowed continuous rapid degradation of phenol, but it also led to more complete mineralization of phenol (up to 92%) than the other protocols. The results demonstrate that intimate coupling was achieved by protecting the biofilm from UV and free-radical inhibition. With phenol as the target compound, the main advantage of intimate coupling in the IPBR was increased mineralization, presumably because photocatalysis made soluble microbial products more rapidly biodegradable.
开发了一种集成光催化-生物反应器（IPBR）以加速苯酚的降解和矿化。在 IPBR 中，光降解和生物降解同时发生，但在两个分离的区域中进行：涂有 TiO(2)膜的一块毡玻璃板与被紫外线照射的光进行内部循环连接，与蜂窝陶瓷连接，蜂窝陶瓷是生物膜的生物降解载体。这种布置旨在实现光催化和生物降解的紧密耦合。通过以下三种方案研究了苯酚的降解：在紫外光下使用 TiO(2)膜进行光催化，但没有生物膜（光降解）；没有紫外线的生物膜生物降解（生物降解）；以及同时的光降解和生物降解（紧密偶联的光生物降解）。单独的光降解可以部分降解苯酚，但不能实现显著的矿化，即使 HRT 为 10 小时。单独的生物降解可以完全降解苯酚，但不能将 COD 矿化超过 74%。光生物降解可以连续快速降解苯酚，但也导致苯酚的矿化程度比其他方案更高（高达 92%）。结果表明，通过保护生物膜免受紫外线和自由基抑制来实现紧密偶联。以苯酚为目标化合物，IPBR 中紧密偶联的主要优势是增加了矿化程度，这可能是因为光催化使可溶性微生物产物更快地生物降解。
