絮凝剂对工程废弃泥浆脱水性能的影响  

Effect of flocculants on dehydration properties of construction waste slurry

作　　者：高宇[1] 周普玉 杨霞[1] 李阳[1] GAO Yu ZHOU Puyu YANG Xia LI Yang(Shanghai Research Institute of Building Science, Shanghai 201108, China)

机构地区：[1]上海市建筑科学研究院,上海201108

出　　处：《环境工程学报》2017年第10期5597-5602,共6页Chinese Journal of Environmental Engineering

基　　金：上海市科学技术委员会应用技术开发专项资金项目(2015-111)

摘　　要：为了提高工程废弃泥浆的脱水效率,以毛细吸水时间(CST)为评价指标,研究了添加不同种类及不同用量的絮凝剂对废弃泥浆脱水性能的影响。结果表明,絮凝剂存在最适添加量,添加不足或过量的絮凝剂均会使絮凝效果下降。阴离子聚丙烯酰胺(APAM)具有较强的吸附架桥能力,脱水效果最好,絮体粒径大,脱水效果改善明显且添加量最少。原泥浆稀释至80%含水率后,APAM的最适添加量为60 mg·L^(-1),对应的CST值为23.4 s。CST法可作为泥浆调理沉降快速筛选絮凝剂的分析方法。To improve the dehydration efficiency of construction waste slurry,capillary suction time（ CST） was evaluated as an indicator to investigate the influence of different type and amount of flocculants on the dehydration properties.The results indicated that the addition of insufficient or excessive amounts of flocculants resulted in worse effect of flocculation and therefore the flocculant dosage can be optimized.Among all the flocculants tested,the anionic polyacrylamide（ APAM） presented large floc particle size,obvious improvement of dehydration properties and less dosage,which was due to the strong adsorption and bridging capabilities and the best dehydration effect.The optimized dosage of APAM was 60 mg·L^-1 when the slurry was diluted to 80% water content,and the corresponding CST value was 23.4 s after slurry conditioning.The CST could be used as an efficient analytical method to select flocculants.

关 键 词：聚丙烯酰胺 毛细吸水时间 泥浆脱水 含水率 絮凝剂 

分 类 号：X705[环境科学与工程—环境工程]