复合调理剂对城市污泥过滤压榨特性的影响
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2020-03-04 08:01:59
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第28卷第4期高校化学工程学报No.4Vol.282014年8月JournalofChemicalEngineeringofChineseUniversitiesAug.2014文章编号:1003-9015(2014)04-0876-06复合调理剂对城市污泥过滤压榨特性的影响冯国红1,2,谭蔚1,陈晓楠1,刘颖1,贺仲宪3,刘丽艳1(1.天津大学化工学院,天津300072;2.太原科技大学环境与安全学院,山西太原030024;3.浙江金鸟压滤机有限公司,浙江杭州310031)摘要:采用连续进料的实验装置进行城市污泥脱水试验,深入研究了聚合氯化铝和生石灰的添加对城市污泥过滤和压榨特性的影响。结果表明聚合氯化铝的添加有利于形成更大的絮体,生石灰的添加提高了滤饼的渗透性,当聚合氯化铝和生石灰的添加剂量分别为6%和20%(与污泥中干固相的质量比)时,过滤比阻由6.5×1013降至7.9×1012m⋅kg−1,压缩系数由1.4降至0.9。压榨理论分析表明聚合氯化铝和生石灰的添加降低了滤饼的黏性和弹性,提高了滤饼中粒子的蠕变性能,导致主压榨阶段的作用减小(从0.098降至0.017),而第三压榨阶段的作用增加(从0.159增至0.298)。另外,较高的压榨压力有利于滤饼中粒子的蠕变、结合水的去除以及滤饼固含量增加,但由于结合水的去除速率较慢,较高压榨压力对应于较长的压榨时间。关键词:聚合氯化铝;生石灰;城市污泥;过滤;压榨中图分类号:X705;TQ028.55文献标识码:ADOI:10.3969/j.issn.1003-9015.2014.04.029EffectofCompositeFlocculantsonFiltrationandExpressionofMunicipalSludgeFENGGuo-hong1,2,TANWei1,CHENXiao-nan1,LIUYing1,HEZhong-xian3,LIULi-yan1(1.SchoolofChemicalEngineering&Technology,TianjinUniversity,Tianjin300072,China;2.SchoolofEnvironment&Safety,TaiyuanUniversityofScience&Technology,Taiyuan030024,China;3.ZhejiangGoldenBirdFilterCO.,LTD,Hangzhou310031,China)Abstract:Aseriesofdewateringexperimentswerecarriedoutusinganexperimentalfiltrationdevicewithcontinuousfeedingsystemstostudytheeffectsofaddingaluminumpolychloridandlimeonfiltrationandexpressionofmunicipalsludge.Theresultsindicatethataluminumpolychloridhasadvantageinforminglargerflocs,andlimecanincreasethepermeabilityoffiltercake.When6%and20%(weightpercentage:flocculants/drysolidmassinsludge)ofthetwoflocculantswereusedrespectively,specificresistancestofiltrationandcompressioncoefficientdecreasefrom6.5×1013to7.9×1012m⋅kg−1and1.4to0.9,respectively.Resultsanalysisindicatesthattheelasticityandviscosityofthecakedecreaseafterconditioningandcreepofparticlesincakesbecomesmucheasier,whichleadstolessimportantoftheprimaryexpressionstage(from0.098to0.017)andmoreimportantofthethirdexpressionstage(from0.159to0.298).Withtheincreaseofexpressionpressure,creepofparticlesincakesbecomesmucheasierandmoreboundwatercanberemoved,whichresultsinadriercake.Howevertheboun
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