扩散控制条件下铝基混凝剂除低浓度磷的效果研究

Removal effect of low concentration phosphorus with Al-based coagulant under diffusion control

该研究比较了不同浓度AlCl_(3)和Al_(13)铝基混凝剂在深度不同的情况下对不同磷形态的去除特征。结果表明:AlCl_(3)表现出优异的控磷能力,AlCl_(3)能够在2 h静沉后使总磷(TP)下降至9μg/L,并可在较短时间内降低溶解态磷,而Al_(13)对吸附态磷的去除效果更好;AlCl_(3)和Al_(13)都有助于表层水中颗粒态磷的去除,在pH=7.5的条件下,磷以Al-P沉淀的形式得以去除;AlCl_(3)具有更优的有机物去除能力,能够在0.5 h时使DOC浓度快速降低。研究结果可为选择合适的控磷药剂和投药量提供参考,有助于制定原位磷污染控制策略及维护生态健康。

The study compared the removal characteristics of different phosphorus forms at different depths with different concentrations of AlCl3 and Al13 aluminium-based coagulants.AlCl3 showed excellent phosphorus control,with AlCl3 reducing total phosphorus(TP)to 9μg/L after 2 h of sedimentation and reducing dissolved phosphorus in a shorter period of time.Both AlCl3 and Al13 contributed to the removal of particulate phosphorus from the surface water.At pH=7.5,phosphorus was removed in the form of Al-P precipitation.AlCl3 had a better ability to remove organic matter and was able to reduce the DOC concentration rapidly at 0.5 h.The results of the study can provide a reference for the selection of suitable phosphorus control agents and dosage,and help to develop in-situ phosphorus pollution control strategies and maintain ecological health.