Comparison of Dairy Manure Anaerobic Digestion Performance in Gas-lift and Bubble Column Digesters

Simple item page
dc.contributor.authorTang, Jingen
dc.contributor.committeechairWen, Zhiyouen
dc.contributor.committeememberWu, Binxinen
dc.contributor.committeememberOgejo, Jactone Arogoen
dc.contributor.departmentBiological Systems Engineeringen
dc.date.accessioned2014-03-14T21:52:06Zen
dc.date.adate2010-01-07en
dc.date.available2014-03-14T21:52:06Zen
dc.date.issued2009-12-04en
dc.date.rdate2010-01-07en
dc.date.sdate2009-12-19en
dc.description.abstractAnaerobic digestion is one of the most promising management options for dairy manure treatment. Manure wastewater from dairy farms has been used for methane production for decades. However, performance failure due to inadequate mixing is routine. In general, the mixng of anaerobic digester is achived throguh mechnical stirring, liquid circulation, and gas circulation, among which the gas circulation proves to be the most effcient way. In this work, we studied the liquid flow pattern of two differetn type of gas-circualtion based anaerobic digesters, with the aim to understand the effects of hydrodynamic behavior of the digesting liquid on the anaerobic digestion performance, so a better mixing strategy can be provided. We used two 20-L gas circulation based anaerobic digesters with confined (gas-lift) and unconfined (bubble column) design. The anaerobic digestion performance and mixing behaviors were studied at different gas recirculation rate. It was found that the biogas production from the bubble column was constantly higher than that from gas-lift digester. However, the overall flow of the two digesters, which is indicated by residence time distribution (RTD), showed a similar pattern. Furhter investigation of local liquid flow behavior using Computational Fluid Dynamic (CFD) indicate that the bubble column accumulated higher portion of sludge in the bottom of the digester, which has a higher TS and VS, COD, and biomethane production potential than those from the gas-lift digester. This is the reason that the biogas production from the bubble column is higher than the gas-lift digester. Through this study, a thorough characterization of the flow behavior of the anaerobic digester were developed, and provided a deep insight of its influence on the anaerobic digestion performance.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-12192009-013745en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12192009-013745/en
dc.identifier.urihttp://hdl.handle.net/10919/46319en
dc.publisherVirginia Techen
dc.relation.haspartTang_J_T_2009.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectRTDen
dc.subjectComputational fluid dynamicsen
dc.subjectanaerobic digesteren
dc.subjectdairy manureen
dc.subjectgas recirculation mixingen
dc.titleComparison of Dairy Manure Anaerobic Digestion Performance in Gas-lift and Bubble Column Digestersen
dc.typeThesisen
thesis.degree.disciplineBiological Systems Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Tang_J_T_2009.pdf
Size:
1.27 MB
Format:
Adobe Portable Document Format
Download

Collections

Masters Theses