State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, P.O. Box 2606, 202 Haihe Road, Harbin 150090, China.
Bioresour Technol. 2011 Nov;102(21):9838-42. doi: 10.1016/j.biortech.2011.07.043. Epub 2011 Jul 29.
Ballast water poses a biological threat to the world's waterways by transferring aquatic species from one body of water to another. This study investigates the use of combined ultraviolet (UV)/Ag-TiO(2)+ozone (O(3)) processes for treating ballast water using Amphidinium sp. as an indicator microorganism. Sufficient Amphidinium sp. cells in ballast waters can be inactivated using O(3) alone, UV irradiation alone (with or without an Ag-TiO(2) coating), and combined treatments. For the low inactivation ratio (<40%) regime, the effects of ozonation and photocatalysis were observed to be cumulative. The combined UV/Ag-TiO(2)+O(3) treatment produced excess hydroxyl radicals and total residual oxidants (TROs), and readily damaged cell membranes to release intracellular substances. The comparison tests revealed that the combined treatments synergistically inactivate Escherichia coli in ballast waters. However, the combined process did not synergistically inactivate Amphidinium sp. cells. Inactivating different aqua species in ballast waters needs distinct treatment methods and dosages.
压载水通过将水生生物从一个水体转移到另一个水体，对世界水道构成生物威胁。本研究使用指示微生物角毛藻（Amphidinium sp.），调查了紫外线（UV）/Ag-TiO(2)+臭氧（O(3)）联合工艺处理压载水的应用。使用臭氧（O(3)）、单独紫外线照射（带或不带 Ag-TiO(2)涂层）和联合处理，足以灭活压载水中的足够数量的角毛藻细胞。对于低灭活率（<40%）的情况，观察到臭氧和光催化的作用是累积的。UV/Ag-TiO(2)+O(3)联合处理产生了过量的羟基自由基和总残留氧化剂（TROs），并轻易破坏细胞膜以释放细胞内物质。比较测试表明，联合处理在压载水中协同灭活大肠杆菌。然而，联合工艺并没有协同灭活角毛藻细胞。在压载水中灭活不同的水生生物需要不同的处理方法和剂量。
