中文摘要：

研究了壳聚糖改性硅藻土对太湖含藻水体中浊度和蓝藻的去除效果。结果表明：（1）在室内模拟实验中，综合叶绿素a的去除率和去除速率来看，较适宜的改性硅藻土投加量为50mg／L。在此投加量下，室内模拟实验中浊度去除率达到91．50％，叶绿素a去除率达到98．10％；（2）在原位实验中，投加改性硅藻土也能有效去除浊度和叶绿素a，表、中、下层3层水体的最终浊度去除率分别达到82．41％、79．09％、72．82％，叶绿素a去除率分别为92．43％、87．17％、65．62％。（3）无论在室内模拟实验还是原位实验中，投加改性硅藻土后水体的浊度去除和叶绿素a去除均呈现出显著的相关性（p〈0．01），即两者的去除具有一定的同步性。

英文摘要：

Pot and in-situ experiments were carried out to verify the performance of chitosan-modified diatomite on turbidity and chlorophyll a removal from algae-containing waters of Taihu Lake. Considering the removal rate and speed of chlorophyll a, the appropriate chitosan-modified diatomite dosage in pot experiments was 50 mg/L. Under this condition,the removal rate of water turbidity and chlorophyll a was 91.50% and 98.10% respectively. In the in-situ experiments, chitosan-modified diatomite could also remove the turbidity and chlorophyll a effectively. For the surface, middle and bottom layers of Taihu Lake, the turbidity removal rate was 82. 41%, 79.09 %, 72.82 %, and chlorophyll a removal rate was 92.43% ,87.17% ,65.62% respectively. The removal rates of water turbidity was significantly posi- tive correlated with that of chlorophyll a （p〈0.01） both in pot and in-situ experiment,implicating a synchronized de- creasing trend of water turbidity and algae content.