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时间:2020-04-20
《连续在线滤袋式淤泥脱水技术.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第7卷第11期环境工程学报V01.7.No.112013年11月ChineseJournalofEnvironmenta1EngineeringNOV.2013连续在线滤袋式淤泥脱水技术王辰刘宏波符波祖叶品刘和(江南大学环境与土木工程学院环境生物技术研究室,无锡214122)摘要以太湖淤泥为研究对象,研究了絮凝剂和滤袋性质对淤泥脱水性能的影响,并进行了滤袋脱水中试研究。结果表明,淤泥的含水率为90%时,在PAM和PAC最佳添加量55mg/L和1000mg/L条件下,淤泥比阻从8.7×1082/g降低到2.0×
2、1082/g,Zeta电位从一28.77mV变成一4.68mV,滤袋平均过滤速度提高了137.9%,脱水性能显著提升。不同含水率下的实验得出了淤泥的最佳絮凝剂添加曲线;特殊材料滤袋相比于普通材料滤袋,滤袋的脱水综合能力大幅度提升,平均过滤速度达到0.479in/(in·h),淤泥回收率为98.7%,泥饼含水率为71.6%;中试实验表明,淤泥经过4h过滤后,淤泥的含水率降到较低的65%,最终回收率可达到98.6%,滤液中污染物浓度满足国家排放标准。与传统技术相比,本技术具有脱水周期短、成本低、操作简单、安全性强
3、等优点。关键词淤泥滤袋脱水比阻Zeta电位絮凝剂中试中图分类号X705文献标识码A文章编号1673—9108(2013)114547-06Continuouson-lineoperationforsiltdewateringbyfilterbagWangChenLiuHongboFuBoZuYepinLiuHe(LaboratoryofEnvironmentalBiotechnology,SchoolofEnvironmentalandCivilEngineering,JiangnanUniversity,W
4、uxi214122,China)AbstractEffectsofflocculantsadditionandfiherbagpropertiesonthedewateringperformanceofthesiltfromTaihuLakewereinvestigatedandpilot—scaletestswerecarriedout.Whenthemoisturecontentofsiltwas90%,themostappropriatedosagesofPAMandPACwere55and1000mg
5、/L,respectively.Thespecificresist—anceofsiltreducedfrom8.7×10to2.0×10s2/gandZetapotentialshiftedfrom一28.77to一4.68mV.Meanwhile.theaveragefiltrationvelocityoffilterbagwasimprovedby137.9%anddewateringabilityofslitwasalsoobviouslyimproved.Theoptimumflocculantdo
6、singcurvewasobtainedbyaseriesofdewateringtestsbyU-singsiltswithdifferentmoisturecontents.Thecomprehensivedewateringabilityofthisspecialfilterbagshowedadvantagesovertheordinaryfilterbagswiththeaveragefiltrationrateof0.479m/(m·h),siltrecoveryrateof98.7%andslu
7、dgecakemoisturecontentof71.6%.Furthermore.pilot-scaletestsshowedthatthemoisturecontentofsiltcouldbedechnedtolessthan65%afterfilteredforfourhours.Thesiltrecoveryratecouldreach98.6%andthequantityoftheefluentcouldmeetthenationaldischargingstandards.Comparedwit
8、htraditionaltechnologies,thisnewtechnologypresentedtheadvantagesofeasyoperation,reliableperformance,lowcostandshort-timeoperationperiod.Keywordssilt;filterbagdewatering;specificresistance;Zetapotential
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