PAC-PDMDAAC复合混凝剂对混凝-超滤联用工艺的影响研究
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- 论文作者：沈雪 ; 高宝玉
- 年：2016
- 作者机构：山东省水环境污染控制与资源化重点实验室;山东大学环境科学与工程学院;
- 论文关键词：复合混凝剂 ; 腐殖酸和黄腐酸 ; 混凝-超滤联用工艺 ; 混凝效果 ; 絮体特性
- 会议召开时间：2016-10-25
- 会议录名称：2016中国水处理技术研讨会暨第36届年会论文集
- 语种：中文
- 分类号：TU991.22
- 学会代码：GSCL
- 会议名称：2016中国水处理技术研讨会暨第36届年会
- 会议地点：中国江苏南京
- 主办单位：中国化工学会工业水处理专业委员会、中国石油学会海洋石油分会
- 学会名称：中国化工学会工业水处理专业委员会
- 页数：9
- 文件大小：1119k
- 原文格式：D
- 会议级别：全国
摘要
随着对水质的要求越来越严格,超滤工艺被广泛应用于地表水处理,然后地表水中存在大量的腐殖酸(HA)和黄腐酸(FA),HA和FA在超滤过程中造成的膜污染则成为需要解决的难题。因此本研究深入探究在经过混凝预处理后的HA水样和FA水样对超滤过程中不同膜材料造成的膜污染机制。本实验将聚二甲基二烯丙基氯化铵(PDMDAAC)与聚合氯化铝(PAC)进行复合,采用PAC和不同复合比的PAC-PDMDAAC做混凝剂,探究其分别对混凝-超滤联用工艺中腐殖酸和黄腐酸的去除机理。采用Mastersizer 2000型激光粒度仪测定混凝过程中絮体粒径的变化情况并计算分形维数来探究混凝过程的絮体特性。通过超滤过程膜通量的变化探讨其膜污染程度并进行对比讨论。试验结果表明:在HA和FA混凝处理中,复合混凝剂PAC-PDMDAAC的最佳复合比为5:1,且PAC和PAC-PDMDAAC对HA的去除效果更好。絮体特性实验结果表明复合混凝剂PAC-PDMDAAC可显著改善絮体结构,增大絮体的粒径,使形成的絮体结构更疏松但强度大不易破碎。且超滤膜污染实验的结果与混凝效果和絮体特性部分的实验结果对应,PAC-PDMDAAC(5:1)可以明显减轻膜污染,对HA水样的膜污染程度改善更明显。FA分子因为其较小的分子量形成的絮体粒径较小,从而导致的膜污染较HA更重。而两种膜材料中使用聚醚砜膜时的膜污染更轻,但是反冲洗效果较差不能重复利用,使用再生纤维膜时的膜污染较重但反冲洗效果较好。
引文
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[6]E.E.Chang~',P.C.C.,S.H.Cha C,and C.H.Liang 2,
[7]Chang,E.E.;Chiang,P.C.;Chao,S.H.;Liang,C.H.,Endocrine Disrupting Chemicals and Human Health Effects of polydiallyldimethyl ammonium chloride coagulant on formation of chlorinated by products in drinking water.Chemosphere 1999,39,(8),1333-1346.
[8]Xu,W.;Yue,Q.;Gao,B.;Du,B.,Impacts of organic coagulant aid on purification performance and membrane fouling of coagulation/ultrafiltration hybrid process with different Al-based coagulants.Desalination 2015,363,126-133.
[9]Benjamin Pushparaj,E.P.,Giuseppe Torzillo&Riccardo Materassi*,
[10]Wang,J.-P.;Chen,Y.-Z.;Ge,X.-W.;Yu,H.-Q.,Optimization of coagulation–flocculation process for a paper-recycling wastewater treatment using response surface methodology.Colloids and Surfaces A:Physicochemical and Engineering Aspects 2007,302,(1-3),204-210.
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[12]Costa,A.;Depinho,M.,Effect of membrane pore size and solution chemistry on the ultrafiltration of humic substances solutions.Journal of Membrane Science 2005,255,(1-2),49-56.
[13]Jung,C.-W.;Son,H.-J.;Kang,L.-S.,Effects of membrane material and pretreatment coagulation on membrane fouling:fouling mechanism and NOM removal.Desalination 2006,197,(1),154-164.
[14]Huang,C.;Lin,J.-L.;Lee,W.-S.;Pan,J.R.;Zhao,B.,Effect of coagulation mechanism on membrane permeability in coagulation-assisted microfiltration for spent filter backwash water recycling.Colloids and Surfaces A:Physicochemical and Engineering Aspects 2011,378,(1–3),72-78.
[15]Lin,J.-L.;Huang,C.;Chin,C.-J.M.;Pan,J.R.,Coagulation dynamics of fractal flocs induced by enmeshment and electrostatic patch mechanisms.Water research 2008,42,(17),4457-4466.
[16]Sun,C.;Yue,Q.;Gao,B.;Cao,B.;Mu,R.;Zhang,Z.,Synthesis and floc properties of polymeric ferric aluminum chloride–polydimethyl diallylammonium chloride coagulant in coagulating humic acid–kaolin synthetic water.Chemical Engineering Journal 2012,185-186,29-34.
[17]Chaignon,V.;Lartiges,B.S.;El Samrani,A.;Mustin,C.,Evolution of size distribution and transfer of mineral particles between flocs in activated sludges:an insight into floc exchange dynamics.Water research 2002,36,(3),676-684.
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[19]Huang,X.;Gao,B.;Rong,H.;Yue,Q.;Zhang,Y.;Teng,P.,Effect of using polydimethyldiallylammonium chloride as coagulation aid on polytitanium salt coagulation performance,floc properties and sludge reuse.Separation and Purification Technology 2015,143,64-71.
[20]Cheng,W.P.;Chi,F.H.,A study of coagulation mechanisms of polyferric sulfate reacting with humic acid using a fluorescence-quenching method.Water research 2002,36,(18),4583-4591.