阴阳离子有机絮凝剂对污泥脱水效果的研究

为研究阴阳离子有机絮凝剂对污泥的脱水效果,在不同条件下分别向污泥中投加聚二甲基二烯丙基氯化铵(HCA)和聚丙烯酰胺(APAM)。结果表明:絮凝剂浓度、过滤时间、p H显著影响污泥的脱水性能;污泥脱水最佳的絮凝反应条件为絮凝剂投加量为30 mg/L,污泥p H为5,真空抽滤时间为4 min;投加HCA和APAM的污泥都能取得良好的脱水效果,但HCA污泥脱水效果优于APAM。另外,吸附架桥是离子型有机絮凝剂高效絮凝的主要机理,电中和起辅助作用。

RESEARCH OF THE POSITIVE AND NEGATIVE OF IONIC ORGANIC FLOCCULANT ON SLUDGE DEWATERING

To research the behavior of the ionic organic flocculant on sludge dewatering，under different conditons， the paper added the flocculant of poly diallyl dimethyl ammonium chloride ( HCA) and polyacrylamide ( APAM) to the sludge． The results showed that pH，flocculation time and the dosage of flocculant significantly affected the performance of sludge dewatering． The optimal reaction conditions of sludge dewatering was the flocculant dosage of 30 mg /L，the pH of 5，the vacuum filtration time of 4min． HCA and APAM could achieve better performance of sludge dewatering，but the behaviour of HCA was better than APAM． Besides，adsorption bridging was the main mechanism of flocculation reaction，charge neutralization played a supporting role．