壳聚糖助凝对三氯化铁絮体形态和强度的影响

采用三氯化铁(FeCl3)为混凝剂、壳聚糖(CTS)为助凝剂进行给水混凝处理,研究了CTS助凝对FeCl3絮体形态和强度的影响.结果表明,在FeCl3投加量为29mg/L(以Fe计)、CTS投加量为0.1mg/L条件下,CTS助凝对絮体形态和强度有明显影响,分形维数由单独投加FeCl3时的1.1855增加到CTS助凝后的1.3028,絮体强度因子(SF)由50~60变为60~70,CTS助凝后形成的絮体密实、易沉降,絮体强度大且不易破碎.另外,添加CTS助凝后,TOC、色度、UV254、浊度的去除均明显提高.

Influence of chitosan coagulation aid on floe form and strength

With FeCl3 used as coagulating agent, and CTS as coagulant aid, the influence of chitosan coagulation aid on floc form and strength was studied. Under the FeCl3 dosage was 29mg/L, CTS dosage was 0.1mg/L, the effect of chitosan coagulation aid on floc form and strength was obvious. The fratal dimension and SF increased from 1.1855 and 50~60 when FeCl3 was dosed only, to 1.3028 and 60~70 when chitosan was used as coagulation aid. Chitosan coagulation aid had marked influences on floc form and floc strength, chitosan coagulation aid helped to make the floc dense and easy settlement, to make the floc strength and not easily broken. In addition, the removal efficiency of TOC, chroma, UV254 and turbidity were improved obviously.