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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。
Experiment on coagulation and algae removal using modified chitosan for water in different areas of Taihu Lake. For the pump water, dosage of 0.7 mg / L, algae removal rate of up to 89.6%, for shore high concentration of algae water dosage 4 mg / L, 0.5 h within the algae removal rate up to 85.77%. Modified chitosan compound clay can solve the floating problem of shore algae flocs. When the clay is added 0.8 g / L flocs can completely sink, algae removal rate fe increased from 85.77% to 94.35%. However, with clay caused UV254 removal rate decreased. Modified chitosan mixed with 0.3 g / L PDMDAAC modified fly ash or added 0.4 g / L modified zeolite, the floc can also be completely sink, algae removal rate can be increased to more than 98%. At the same time, both agents enhanced the removal of organic matter from the system, and the UV254 removal rate increased from 56.94% to over 72%.