不同混凝剂对污泥回流效果和絮体特性影响研究  

Study on Effect of Different Coagulants for Sludge Reflux Efficiency and Floc Characteristics

作　　者：柯水洲[1] 涂家勇 朱佳[2] 韦伟[3] 高静思 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]深圳职业技术学院建筑与环境工程学院,广东深圳518055 [3]哈尔滨工业大学市政与环境工程学院,黑龙江哈尔滨150090 [4]深圳市清淼环保科技有限公司,广东深圳518055

出　　处：《水处理技术》2016年第2期19-22,共4页Technology of Water Treatment

基　　金：国家自然科学基金(51478274);2013深圳科技创新(CYZZ20130319145027392)

摘　　要：以氯化铁、聚合氯化铝(PAC_(20)、PAC_(25))为混凝剂处理低浊微污染水,对比考察了不同混凝剂对常规工艺和污泥回流工艺絮体的ζ电位、沉后水质、絮体形成及破碎再絮凝的影响。结果表明,与常规工艺相比,当混凝剂以吸附架桥为主要混凝机理时,采用污泥回流工艺后,出水浊度明显降低,而以电中和为主要混凝机理时会导致出水浊度升高,污泥回流工艺不能提高溶解性有机物的去除率,聚合氯化铝中的Al_c有助于促进污泥回流对浊度的去除,污泥回流后,絮体的强度因子降低。另外,絮体的恢复因子与污泥回流对浊度的去除效果有较好的相关性。In treatment of low turbidity and micro-polluted water,multiple parameters of the conventional process and sludge reflux process includingζ potential,settled water quality,as well as formation,breakage and re-growth of floc were investigated with Ferric chloride and polyaluminum chloride（PAC_（20）/PAC_（25）） as coagulant.Compared with conventional process,coagulant with ability of adsorption bridging can promote removal efficiency of turbidity,whereas coagulant with ability of the charge neutrality will lead to the turbidity of effluent increased,the removal of the dissolved organic substance by the sludge reflux is not obvious;the Al_c of polyaluminum chloride can improve the sludge reflux efficiency.In addition,sludge reflux will decrease the flocs strength and there is a good correlation between the floc recovery factor and sludge reflux for the removal efficiency of turbidity.

关 键 词：混凝剂 氯化铁 聚合氯化铝 污泥回流 混凝效能 强度因子 恢复因子 

分 类 号：X703.1[环境科学与工程—环境工程]