丝状真菌调理对柠檬酸污泥脱水性能的影响

中国环境科学2019,39(6)：2467~2474ChinaEnvironmentalScience丝状真菌调理对柠檬酸污泥脱水性能的影响董黎明1*,郑心愿1,胡修玉2,李影影1,李杨杨1(1.北京工商大学中国轻工业清洁生产和资源综合利用重点实验室,北京100048；2.中国生物发酵产业协会,北京100833)摘要：利用实验室分离的丝状真菌AspergillusnigerSS5对柠檬酸污泥进行了污泥脱水前的生物调理.结果表明,菌液浓度和调理时间是影响污泥脱水性能的主要因素,调理后污泥的脱水性能､沉降性能均有明显改善,调理后的污泥负电荷减少,粒径显著增大,结合水含量比未投加菌液的空白对照降低了近40%.同时,真菌调理显著降低了上清液COD及污泥各EPS层的蛋白质和多糖含量,EPS中蛋白质的降解与污泥结合水含量、D50和Zeta电位显著相关,是影响柠檬酸污泥脱水性能改善的重要因素,且有机物的降解并未导致污泥pH值的显著变化,这和柠檬酸污泥拥有较大的酸碱缓冲容量有关.采用20mL/gDS的AspergillusnigerSS5调理柠檬酸污泥,调理3d可使泥饼含水率降至71.98%,且调理过程无化学药剂加入,更有利于柠檬酸等食品发酵类工业污泥的后续资源化综合利用.关键词：柠檬酸污泥；丝状真菌；污泥调理；脱水性能中图分类号：X705文献标识码：A文章编号：1000-6923(2019)06-2467-08Theeffectsoncitricacidsludgedewateringwithfilamentousfungiconditioning.DONGLi-ming1*,ZHENGXin-yuan1,HUXiu-yu2,LIYing-ying1,LIYang-yang1(1.KeyLaboratoryofCleanerProductionandIntegratedResourceUtilizationofChinaNationalLightIndustry,BeijingTechnologyandBusinessUniversity,Beijing100048,China；2.ChinaBiotechFermentationIndustryAssociation,Beijing100833,China).ChinaEnvironmentalScience,2019,39(6)：2467~2474Abstract：ThecitricacidsludgewasconditionedbiologicallywiththeseparatedfilamentousfungiAspergillusnigerSS5beforedewateringinthepaper.Resultsshowedthatfungiconcentrationandconditioningtimebothhadstrongeffectsonthesludgedewaterability,andtheperformanceofsludgedewateringandsettlementwereimprovedsignificantly.CombinedwiththeanalysisofZeta,particledistributionandboundwaterconcentration,itwasobservedthatnegativechargeofsludgedecreasedaccompaniedbyobviouslyincreasingparticlesize.Theconcentrationofboundwaterhadareductionofapproximate40%tothecontrolsamplewithoutfungiconditioning.Meanwhile,theconcentrationsofCODinsupernatantandproteinandpolysaccharideineachEPSlayerwerealldecreasingduringthesludgeconditioningwithfungi.ThereweresignificantcorrelationsbetweenproteindegradationinEPSandboundwatercontent,D50andZetapotential,whichindicateditwastheimportantfactoraffectingcitricacidsludgedewaterability.DuetothelargepHbufferingcapacityofcitricacidsludge,thegreatpHchangewasnotobservedduringthedec