基于阳离子淀粉的富藻水絮凝处理及藻渣脱水OA

Addressing the challenges of low efficiency,poor dewatering of algal residues,and difficulties in resource utilization during cyanobacterial bloom control,this study introduced 3-chloro-2-hydroxypropyltrimethyl ammonium chloride(CTA)to prepare cationic starch-based flocculants St-CTA(starch-grafted CTA)with different degrees of substitution.These flocculants were characterized using techniques such as FTIR,1H NMR,and Zeta potential.Using cyanobacterial water from Taihu Lake as a model,the flocculation performance and dewatering efficiency of algal residues were systematically evaluated for both standalone St-CTA and its combinations with inorganic coagulants(e.g.,CaO,AlCl3,CaCl2).The results showed that St-CTA3,with a cationic substitution degree of 39.67％,achieved removal rates of 95.6％,81.2％,and 67.31％for algal cells,turbidity,and A254,respectively,at a dosage of 100 mg·L-1,outperforming traditional flocculants.When combined with CaO,a synergistic effect was observed,achieving an A254 removal rate of 81.2％and significantly improving nutrient removal.The flocculants notably enhanced the dewatering performance of algal residues,achieving a dewatering rate of 36.7％,while maintaining good short-term stability in the environment and demonstrating favorable biodegradability under enzymatic action.Economic analysis indicated a treatment cost of only 0.82～1.23 RMB per ton of water,highlighting strong application potential.This study verifies the high efficiency,safety,and sustainability of cationic starch-based flocculants in cyanobacterial bloom control,offering a green and resource-oriented solution for water pollution management.