Abstract：
Quaternary-ammonium chitosan (CT-CTA) is a popular water treatment agent, and its electropositivity and cation strength are improved compared with chitosan. The use of CT-CTA is widely advocated to remove suspended particles and organic matter from wastewater. However, the solubility of CT-CTA is an important factor affecting the performance of CT-CTA, which is a neglected problem in previous studies. In the study, CT-CTA with different solubilities were prepared by adjusting pH from 2 to 7 in preparation, and their applications were explored in wastewater. When the pH was 2, 2.5, or 3, the obtained CT-CTA was a dissolved state. The turbidity and color removal were 95 % - 98 % and 60 % - 74 %, respectively. When the pH was 4, 5, 6, or 7, the obtained CT-CTA was a solid state. The turbidity and color removal were 30 % - 63 % and 90 % - 97 %, respectively. For domestic-wastewater treatment, CT-CTA in a dissolved state removed 92 % of turbidity and 50 % of chemical oxygen demand (COD). CT-CTA in a solid state removed 86 % of turbidity and 64 % of COD with poly aluminum chloride (PAC). The results illustrated the performance of CT-CTA with different solubilities, which can broaden its application in wastewater treatment.
摘要：
壳聚糖季铵盐(CT-CTA)是一种常用的水处理剂,与壳聚糖相比，其正电性和阳离子强度均有所提高。广泛提倡使用CT-CTA去除废水中的悬浮颗粒和有机物。然而,CT-CTA的溶解度是影响CT-CTA性能的重要因素,这是以往研究中一个被忽视的问题。在研究中,通过在制备中调节pH从2到7制备具有不同溶解度的CT-CTA,并探讨了它们在废水中的应用。当pH为2、2.5或3时,获得的CT-CTA为溶解状态。浊度和色度去除率分别为95%-98%和60%-74%,分别。当pH为4、5、6或7时,获得的CT-CTA为固态。浊度和色度去除率分别为30%-63%和90%-97%，分别。对于生活污水处理，处于溶解状态的CT-CTA去除92%的浊度和50%的化学需氧量(COD)。固态CT-CTA用聚氯化铝(PAC)去除86%的浊度和64%的COD。结果表明，CT-CTA具有不同的溶解度，可以拓宽其在废水处理中的应用。
