磁性壳聚糖改善污泥脱水性能的研究

中国环境科学2019,39(7)：2944~2952ChinaEnvironmentalScience磁性壳聚糖改善污泥脱水性能的研究郭俊元∗,文小英,贾晓娟,郭子豪,许家劲(成都信息工程大学资源环境学院,四川成都610225)摘要：采用天然壳聚糖为原料,戊二醛为交联剂,Fe3O4为磁核制备磁性壳聚糖,以改善污泥脱水性能.考察了磁性壳聚糖投加量、污泥pH值、调理时间对磁性壳聚糖改善污泥脱水性能的影响,探讨了磁性壳聚糖的作用机理,并通过响应面法研究了磁性壳聚糖和CPAM复配处理污泥对污泥脱水性能的影响.结果表明,保持污泥pH值为6.8时,经20mg/L的磁性壳聚糖调理30min后,污泥比阻(SRF)和含水率(MC)分别由原污泥的13.8×1012m/kg和98.7%降低至4.8×1012m/kg和75.5%,说明磁性壳聚糖明显改善了污泥脱水性能.响应面实验所拟合的响应值为污泥SRF的二次模型P(Prob>F)<0.05、R2=0.98>0.90,响应值为污泥MC的二次模型P(Prob>F)<0.05、R2=0.95>0.90,表明模型显著,且实验设定变量之间的相关性较好.根据响应值的分布情况,确定污泥脱水的最佳条件为磁性壳聚糖18mg/L、CPAM26mg/L、调理时间27min,相应SRF和MC分别为3.3×1012m/kg和59.5%,污泥脱水效果较单独采用磁性壳聚糖或CPAM时得到了明显的提高.关键词：活性污泥；污泥脱水；磁性壳聚糖；响应面分析中图分类号：X703文献标识码：A文章编号：1000-6923(2019)07-2944-09Preparationofmagneticchitosanandimprovementofdewateringperformanceofsludge.GUOJun-yuan∗,WENXiao-ying,JIAXiao-juan,GUOZi-hao,XUJia-jing(CollegeofResourcesandEnvironment,ChengduUniversityofInformationTechnology,Chengdu610225,China).ChinaEnvironmentalScience,2019,39(7)：2944~2952Abstract：NaturalchitosanwasusedasrawmaterialtopreparemagneticchitosanbycrosslinkingwithglutaraldehydeandFe3O4forenhancementofthesludgedewatering.Theeffectsofmagneticchitosandosage,sludgepHandconditioningtimeontheperformanceofmagneticchitosanforsludgedewateringwereinvestigated,andtheenhancementmechanismwasdiscussed.Subsequently,responsesurfacemethodology(RSM)wasemployedtooptimizetheprocessofsludgedewateringbythecomplexofCPAMandmagneticchitosan.WhensludgepHvaluewas6.8,afterconditionedby20mg/Lofmagneticchitosanfor30min,SRFandMCweredecreasedfrom13.8×1012m/kgand98.7%oftheoriginalsludgeto4.8×1012m/kgand75.5%,respectively,indicatedthatthesludgedewateringwassignificantlyenhanced.SRFandMCweresettledasthetargetresponsesintheexperimentsdesignedbyRSM,asthedeterminationcoefficients(R2)of0.98and0.95,thetwoquadraticmodelscouldagreewithexperimentaldatawell.Theoptimalconditionsforsludgedewateringweremagneticchitosandosageof18mg/L,CPAMdosageof26mg/L,andconditioningtimeof27min,underthisoptimalcondition,SRFandMCappearedas3.3×1012m/kgand59.5%,respe