阳澄湖水源地水质调查及微污染原因浅析

阳澄湖属于典型的淡水养殖水源,微污染问题长期存在,这对饮用水厂的水质安全存在威胁。因此,对阳澄湖开展微污染因子筛查十分必要。根据长期的水质数据,确定了基本微污染因子为高链酸盐指数(CODMn)、总磷、总氮和氨氮,特征微污染因子为藻类、土臭素和2-甲基异莰醇(2-MIB)。另外,对水源地、周边水域及养殖区同步采样,利用德国BBE公司提供的三维荧光检测分析仪FluoSens进行腐殖质(HS)、生物聚合物和SAK255检测,结合藻类等其他常规指标,多层面分析发现养殖业带来的有机污染是主要污染源,且浓度水平较高;养殖区内富营养化程度也比周边水域高。微污染因子是动态变化的,缺乏预见性,因此微污染因子的确定势必是长期、细致和艰巨的工作。

Water Quality Investigation and Micro-pollution Analysis of Yangcheng Lake Water Source

Yangcheng Lake is a typical water source of freshwater aquaculture, and the micropollution problem exists for a long time, which has the potential hazard to water quality safety of drinking water plants. Therefore, it is necessary to screen the micro-polluted factors in Yangcheng Lake. According to analysis of long-term water quality data, the basic micro-polluted factors, including the permanganate index, total phosphorus, total nitrogen and ammonia nitrogen, were determined, and the characteristic micro-polluted factors were algae, geosmin and 2-methylisodecyl alcohol ( 2-MIB ). Besides, simultaneous sampling of water source areas, surrounding water areas and culture areas was carried out. The humus (HS), biopolymer and SAK255 were tested by using a three-dimensional fluorescence detection analyzer provided by BBE in Germany. Combined with other conventional items such as algae, it was found that organic pollution brought by aquaculture industry was the main pollution source and the concentration level was higher through multi-level analysis. The eutrophication level in the culture area was also higher than that of the suiTounding water. The micro?polluted factors are dynamic and lack of predictability, so the determination of micro-polluted factors is bound to be a long-term, meticulous and arduous work.