富营养化湖泊水中藻毒素的降解技术与机理

Microcystins released from cyanobacterial blooms in eutrophic water have been proved poisonous. However such toxins have been found to have a concentration of over 1.0μg/L for times in some water plants near Taihu Lake. The concentration, separation and detection technology of microcystin are developed in this program. The removal of microcystin has researched by several water treatment processes including biological pretreatment, traditional water treatment, UV- microO3 and BAC. Results show that over 95% microcystins are intracellular during eugonic periods. Aerobic reaction is more efficient than anoxic one in microcystin degradation. Conventional water treatment processes can't remove extracellular microcystins effectively. Three-step biofilm process, better than one-step biofilm process, is able to get rid of over 85%(HRT=2h) extracellular microcystins. Both UV-microO3 and BAC are efficient in removing microcystins from drinking water and can achieve respective removals of over 80%(HRT=1.5h ) and over 85%(HRT=2h). Effective treatment of eutrophic water can be obtained respectively by such combining processes as biofilm pretreatment -traditional processes, traditional processes-UV- microO3 and traditional processes-BAC-disinfection. These research results play a significant role in choosing treatment processes for eutrophic water with microcystins and guiding drinking water plants having eutrophic water sources to offer high quality tap water.

针对我国富营养化水源藻毒素污染现状，研究蓝藻及其毒素的实用水处理方法，藻毒素在不同水处理工艺过程中的性态和降解机理。研究内容还包括完善水中藻毒素测定和评价方法。本研究既具有内容新颖、先进性好的特点，又因直接服务于保护人民健康的目的，有较好的理论意义和实用价值。研究成果将填补我国藻毒素处理方法的空白。