中文摘要：

对利用当地粘土治理水华蓝藻的原位除藻技术进行了研究．实验表明，经壳聚糖改性的当地不同类型粘土都能有效地絮凝除藻，改性粘土的矿物组成和有机质成分对絮凝除藻没有明显的影响．溶液中有机质（TOC≤40mg／L）的存在对壳聚糖改性粘土絮凝除藻有一定的负面影响．在太湖梅梁湾水域围隔中进行的原位除藻试验表明，采用经壳聚糖改性的当地粘土除藻效果明显，在用量仅为0．025g／L（53g／m^2）时，除藻后SD透明度由15cm提高至90cm，叶绿素a的去除率达到98．6％．

英文摘要：

Removal of algal blooms using modified local soils and sediments was studied. It was found that the local soils and sediments modified by chitosan removed algae effectively. The component of local soils and sediments, the organic matter in local soils and sediments had no effect on algae removal. Organic matter content （TOC ≤40 mg/L） in water had a little negative effect on removal of algal cells. Field experimental results suggested that chitosan-modified local soils could be highly effective and quick for emergency needs to clear up harmful cyanobacterial blooms in fresh waters. In enclosures in Meiliang Bay of Taihu Lake, a loading of 0. 025 g/L or 53 g/m^2 chitosan-modified local soils removed 98.6% chlorophyll-a while secchi depth increased from 15 cm to 90 cm.