摘要
采用X射线衍射、激光粒度仪及微电泳仪对废弃桩基工程泥浆进行了性质分析。以阴离子型聚丙烯酰胺(APAM)对其进行絮凝分离实验。分析了泥浆浓度对APAM最少投加用量的影响;研究了APAM投加量、分子量、泥浆pH值等因素及聚合氯化铝(PAC)与APAM复合使用对絮凝效果的影响。结果表明:泥浆为呈负电性、微米级硅铝酸盐类矿物微粒所形成的分散悬浮体系;泥浆含泥率低于20%时,APAM对其有较好的絮凝分离效果,APAM投加量及分子量的提升均会使絮团增大;PAC与APAM的复合使用可以降低上清液浊度,但形成的絮团会略有减小;泥浆pH值对上清液浊度影响明显,pH值为6.20时,浊度为76.0 NTU,而在pH值为9.03时,浊度值高达345 NTU。
Characteristics of the waste pile engineering slurry were analyzed with X-ray diffraction, laser particle size analyzer and micro-electrophoresis apparatus. Anionic polyaerylamide （APAM） was used to separate the slurry. Effect of the concentration of slurry on APAM dosing was studied. Effects of the APAM dosage, molecular weight, pH and the combined use of PAC and APAM on the flocculation were discussed. The results showed that the slun7 was a suspension system consists of negatively charged and micron-graded aluminosilicates particles. APAM had a good separation effect of flocculation when the mud containing rate was below 20%. The volume of flocs increased with the rise of APAM dosing quantity and molecular weight. The supernatant turbidity decreased with the combined use of APAM and PAC, but the volume of flocs was slightly reduced. The supernatant turbidity was also affected by the pH of the slurry evidently with values 76.0 NTU at pH 6,20, and high turbidity of 345 NTU at 9.03.
出处
《环境科技》
2012年第1期33-37,共5页
Environmental Science and Technology
