Chen Zhaoyang, Fan Bin, Peng Xianjia, Zhang Zhongguo, Fan Jinghua, Luan Zhaokun
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
Chemosphere. 2006 Aug;64(6):912-8. doi: 10.1016/j.chemosphere.2006.01.038. Epub 2006 Feb 28.
Polyaluminum coagulant with a content of 76.8% of Al30 (PACAl30) was prepared. Its coagulation behaviors were compared with high Al13 content polyaluminum coagulant (PACAl13) and AlCl3. The species stability was studied using Al-Ferron method and 27Al NMR. The coagulation performances were investigated by studying the rate of flocs development, the turbidity removal efficiency and charge neutralization capacity under fixed pH conditions and uncontrolled pH conditions. The effect of pH on coagulation was also studied. The results show that PACAl30 are stable for using as coagulant. PACAl30 causes less pH depression than PACAl13. The charge neutralization capacity of PACAl30 is slightly lower than that of PACAl13 at pH6.8 and higher at pH 6.5. PACAl30 achieves the most effective turbidity removal in these three coagulants. And it acts effectively within a much broader dosage range and a wider pH range when compared with PACAl13. PACAl30 achieves the highest turbidity removal due to its strong flocs formation capacity. The results verify that Al30 is another highly active coagulation/flocculation species for turbidity removal.
制备了Al30含量为76.8%的聚铝混凝剂（PACAl30）。将其混凝行为与高Al13含量聚铝混凝剂（PACAl13）和AlCl3进行了比较。采用Al-Ferron法和27Al NMR研究了其形态稳定性。通过研究在固定pH条件和非控制pH条件下絮体的生长速率、浊度去除效率和电荷中和能力，考察了混凝性能。还研究了pH对混凝的影响。结果表明，PACAl30作为混凝剂使用时具有稳定性。PACAl30引起的pH降低比PACAl13小。在pH6.8时，PACAl30的电荷中和能力略低于PACAl13，在pH6.5时则高于PACAl13。在这三种混凝剂中，PACAl30的浊度去除效果最为显著。与PACAl13相比，它在更宽的投加量范围和更宽的pH范围内都能有效发挥作用。由于其强大的絮体形成能力，PACAl30实现了最高的浊度去除率。结果证实，Al30是另一种用于去除浊度的高活性混凝/絮凝形态。
