生物质秸秆静态与动态厌氧消化产甲烷潜能对比研究_宁桂兴

环境工程2011年第29卷增刊生物质秸秆静态与动态厌氧消化产甲烷潜能对比研究宁桂兴1申欢2文一波1王凯1姜安平1李天增1(1北京桑德国际有限公司设计研究院,北京101102;2北京朗新明环保科技有限公司,北京100088)摘要:中温(32～35℃)环境下,通过对固含率为15%三种不同粒径的发酵物料(0.5cm以下、1～2cm、3～5cm)的厌氧消化过程分析,并且对固含率20%、25%、30%与带消化液回流的厌氧发酵实验研究,结果表明:三种不同粒径发酵物料产气量最大的是<0.5cm,其次依次为1～2cm,3～5cm,考虑到粒径小容易酸化的原因,选择秸秆厌氧消化的粒径范围0.5～2.0cm;小麦秸秆无回流间歇发酵的产气率可达到每立方米发酵物料2～3m3/d,带消化液回流的厌氧发酵产气率达到2.2m3/(m3·d);初始固含率8%的发酵物料经过消化液回流、排剩,最终发酵物的固含率为16.4%;小麦秸秆无回流间歇发酵产甲烷潜能最大达249.0m3/t,对应的固含率为25%,带消化液回流的厌氧发酵产甲烷潜能达223.06m3/t。关键词:厌氧发酵;固含率;粒径COMPARISONOFMETHANOGENESISPOTENTIALWITHSTATICANDDYNAMICANAEROBICDIGESTIONOFBIOMASSSTRAWSTALKNingGuixing1ShenHuan2WenYibo1WangKai1JiangAnping1LiTianzeng1(1.ResearchandDesignInstitute,BeijingSoundInternationGroupCo.,Ltd,Beijing101102,China;2.BeijingLucencyEnviro-Tech.Co.,Ltd.,Beijing100088,China)Abstract:Inthispaper,anaerobicdigestionstatesofwheatstrawstalkwithdifferentsolidholdupsunderther-mophilictemperature(32～35℃)werestudied,andanaerobicdigestionprocessesofafermentedmatterwithasolidholdupof15%havingdifferentparticlesizes(<0.5cm,1～2cm,3～5cm)wereanalyzed,andthreedif-ferentsolidholdups(20%,25%,30%)anddigestfluidbackflowofanaerobicfermentationwerestudiedbytheexperiment.Theresultsshowedthatthehighestgasproductionofthefermentematterwithasolidholdupof15%hadtheparticlesizeofbelow0.5cm,followedby1～2cmand3～5cm.Basedontheconsiderationofacidification,particlesizeof0.5～2cmwaschosenforanaerobicdigestion.Gasyieldofthefermentedmatter/m3couldreach2～3m3/dwithnoreflowintermittentanaerobicfermentation,andgasyieldoftheonewithdi-gestivebackflowofanaerobicfermentationofthefermentedmattarwasas2.2m3/d.Afterdigestedfluidbackflow,thesolidcontentratehangedfrom8%to16.4%.Maximummethanogenesispotentialoftheferme-atedmatterwithsolidcontentrateof25%was249.0m3/twithnoreflowintermittentfermentation,andmax-imummethanogenesispotentialoftheonewithdigestedfluidbackflowofanaerobicfermentationwas223.06m3/t.Keywords:anaerobicfermentation;solidholdups;size0引言近年来,国外出现了一种采用厌氧消化处理城市生物质垃圾的新技术。厌氧发酵技术分为湿法厌氧发酵和干法厌氧发酵技术两种,与湿法发酵技术[1]相比,干法具有运行