太湖水源地水质净化的生态工程试验研究

Ecological engineering experiment on water purification in drinking water source in Meiliang Bay, Lake Taihu

基于生物净化技术与工程措施相结合的思想，在太湖北部的梅梁湾牵龙口水厂水源地实施了净化水质的生态工程试验．该水域位于太湖梅梁湾的东北岸．调查发现，由于这个地区夏季盛行偏南风，吹程长，风浪较大，导致沉积物易于悬浮，且蓝藻也易于在此堆积；同时该水域水较深、透明度较低．为了能够净化水质，在氮磷营养盐浓度依然很高、恢复沉水植物难以奏效的情况下，选择漂浮植物和浮叶植物为主要内容的水生植物恢复手段，结合消浪、挡藻和控藻等技术措施，使得示范区的环境条件得到改善。并达到了净化水源地水质的目的．同时，在试验区内布设大量用于附着生物富集的人工介质，如渔网．结果显示，试验区的水质得到了显著的改善．与示范区外的参照点相比，各项水质参数改善的程度达30％-60％．说明这种新的方法和思路是有效的．

Based on the biological purification and engineering measures, an ecological engineering experiment for water purification had been conducted in the drinking water source place of Qiardongkou water factory in Meiliang Bay, Lake Taihu. This drinking water source place is located in northeastern Meiliang Bay. Because there prevails southeast or southwest wind, onshore wind flow with long fetch results in high waves, sediment resuspension and algal bloom piled up in experimental area. Because of the deep water and low transparency and high nutrient concentration, the submerged macrophytes couldnt be restored. Thus the floating - leaf and floating macrophytes were selected to be planted, combined with wave attenuating, algal bloom blocking to improve the water quality. At same time, large amount of fish net were placed in the experimental zone with which massive periphytes adhere to. The experimental result suggests that this ecological engineering for water purification is effective.