Zhang Kaisong, Zhou Qixing, Wei Shuhe, Ren Liping
Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
Ying Yong Sheng Tai Xue Bao. 2003 May;14(5):789-93.
Combined flocculants with higher environmental safety and lower ecological risk are urgently required in the process of water and wastewater treatment. HECES, a kind of flocculants with high effect and high ecological safety was synthesized by natural and biodegradable polysaccharide starch of corn and inorganic aluminium salt. Flocculent performance includes sediment character and turbidity removal rate. The jar test results showed that the flocculent performance of HECES with the dose of 3.0 mg.L-1 was prior to the combined adding 4.5 mg.L-1 PAC and 1.0 mg.L-1 PAM in treating kaolin suspensions. The optimal concentration of HECES was 8.0 mg.L-1 and 4.0 mg.L-1 in treating domestic wastewater and municipal effluent respectively, with the comparison to 50% an 40% of PAC, the removal rate of turbidity reached 95% and 99%, respectively. It was also identified that the optimal concentration required to effect flocculation depended on kaolin concentration, and on the character of the wastewater within the range examined. It could be more effective to treat wastewater with higher concentration of HECES. The flocculating performance would be better at pH 4.0-9.5. The superior ecological safety of HECES was due to its lower dosage and its lower concentration of residual activated aluminium.
在水和废水处理过程中，迫切需要具有更高环境安全性和更低生态风险的复合絮凝剂。HECES是一种高效且生态安全性高的絮凝剂，由玉米天然可生物降解的多糖淀粉和无机铝盐合成。絮凝性能包括沉降特性和浊度去除率。烧杯试验结果表明，在处理高岭土悬浮液时，投加量为3.0mg.L-1的HECES的絮凝性能优于投加4.5mg.L-1聚合氯化铝（PAC）和1.0mg.L-1聚丙烯酰胺（PAM）的组合。在处理生活污水和城市污水时，HECES的最佳浓度分别为8.0mg.L-1和4.0mg.L-1，与PAC投加量的50%和40%相比，浊度去除率分别达到95%和99%。还确定了实现絮凝所需的最佳浓度取决于高岭土浓度以及在所研究范围内废水的特性。使用更高浓度的HECES处理废水可能更有效。在pH值为4.0 - 9.5时絮凝性能会更好。HECES卓越的生态安全性归因于其较低的投加量和较低的残余活性铝浓度。
