多核聚合形态Al_(30)混凝控制水中腐殖酸与残留铝的研究  

Ways to control humic acid and residual aluminum in water by means of coagulation with polynuclear species Al_(30)

作　　者：肖辉煌[1] 张盼月[1] 曾光明[1] 吴珍[1] 李明[1] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082

出　　处：《安全与环境学报》2007年第4期16-19,共4页Journal of Safety and Environment

基　　金：中国博士后科学基金项目(2004036127);教育部留学回国人员基金项目(757210005)

摘　　要：制备了优势形态为Al30的聚合铝PAC-Al30,与优势形态为Al13的常用聚合铝PAC-Al13及AlCl3作对比实验,考察了不同铝系混凝剂强化混凝控制水中腐殖酸(HumicAcid,HA)和残留铝的差异。结果表明,PAC-Al30具有足够的稳定性,与PAC-Al13和AlCl3相比,PAC-Al30可以更好地控制出水腐殖酸和残留铝浓度,且以碱化度B为2.4的PAC-Al30效果最好。PAC-Al30和PAC-Al13比AlCl3有更宽的有效投量范围,可以提高实际应用中的稳定性。Ca2+和高岭土的存在均有利于PAC-Al30混凝去除HA。低温对PAC-Al30混凝去除HA有不利影响。研究表明,Al30是一种可用于控制水中腐殖酸和残留铝的新型混凝/絮凝活性成分。The present article introduces the method for preparing polyaluminum chlorides PAC-Al30 with a high Al30 content. We have examined the coagulation behaviors and effects of PAC-Al30 in controlling humic acid and residual aluminum in water. The results show that PAC-Al30 enjoys sufficient stability in 90 d. In comparing AlCl3 and polyaluminum chloride PAC-Al13 with a high Al13 content, PAC- Al30 has obvious advantages in controlling hulnic acid and residual aluminum in water with a coagulant dosage lower than 0.04 mmol/L. In addition, PAC-Al30 and PAC-Al13 have a broader dosage range for efficient coagulation than AlCl3 , which helps them to better their own feasibility in practice. The behaviors and coagulation effect of PAC- Al30 can be improved with the increase of B value; However, the restabilization dosage would probably be reduced with the increase of B value. Furthemlore, the effluence of coagulation with PAC-Al30 on pH of samples is weaker than that with PAC-Al13 and stronger than that with AlCl3. The presence of 1 mmol/L Ca^2＋ in water actually benefits HA removal and residual aluminum decrease due to the PAC- Al30 coagulation, especially when the PAC-Al30 dosages were lower than 0.02 mmol/L. With a kaolin concentration of 100 mg/L, PAC- Al30 would display a significant improvement for HA removal and residual aluminum reduction. However, low temperatures are disadvantageous to the HA removal by PAC-Al30 coagulation. Last of all, Al30 is proved to be a new active species for eoagulation-floeculation to remove HA from water.

关 键 词：环境化学 Al30 AL13 强化混凝 腐殖酸 残留铝 

分 类 号：X703.5[环境科学与工程—环境工程]