【摘要】 对太湖不同区域的水使用改性壳聚糖做混凝除藻实验。对于泵取水,投加量0.7 mg/L时,藻去除率可达89.6%,对于岸边高浓藻水,投加量4 mg/L,0.5 h内藻去除率即可达为85.77%。改性壳聚糖复配黏土可解决岸边高浓藻絮体的上浮问题,黏土投加0.8 g/L絮体可完全下沉,除藻率fe从85.77%提升到94.35%。但复配黏土造成UV254去除率下降。改性壳聚糖复配0.3 g/L PDMDAAC改性粉煤灰投加或复配0.4 g/L改性沸石时,絮体也可完全下沉,除藻率都可提升到98%以上。同时,两种药剂都加强了系统对有机物的去除,UV254去除率从56.94%提升到72%以上。更多还原

【Abstract】 Flocculation experiments were made using modified chitosan to remove algae in different regions of the Taihu Lake.For the high concentration algae in Taihu Lake shore,the removal rate of algae was 85.77% within half an hour when the dosage was 4 mg/L;for the water pumped,the removal rate was up to 89.6% when the dosage was 0.7 mg/L.The floating floc in Taihu Lake shore can sink by using modified chitosan assisted by clays.The dosage of clays was 0.8 g/L,the floc sunk completely.The removal rate can be raised to 94.35%.However,the use of clay can cause decrease of UV254 removal rate.The floating floc also can sink by using modified chitosan assisted by PDMDAAC-modified flyash when the dosage of it was 0.3 g/L or modified zeolite when the dosage was 0.4 g/L.The algae removal rate could be raised to more than 98%.Meanwhile,two kinds of agents can also strengthen the removal of organic matter in the water,the removal rate of UV254 56.94% can be up to more than 72%.更多还原