Bioremediation of Pcb Contaminated Surface Soil: A Microcosm Study

dc.contributor.authorDas, Swati Jr.en
dc.contributor.committeechairBerry, Duane F.en
dc.contributor.committeememberZelazny, Lucian W.en
dc.contributor.committeememberLove, Nancy G.en
dc.contributor.departmentCrop and Soil Environmental Sciencesen
dc.date.accessioned2014-03-14T20:50:56Zen
dc.date.adate1998-02-26en
dc.date.available2014-03-14T20:50:56Zen
dc.date.issued1997-02-12en
dc.date.rdate1999-02-26en
dc.date.sdate1997-02-12en
dc.description.abstractThis feasibility study was performed at Virginia Polytechnic Institute and State University (Blacksburg, VA) in collaboration with BioSystems Technology, Inc. (Blacksburg, VA). In this study, degradability of PCBs (Aroclor 1242) from an aged surface soil was evaluated using serum bottle microcosms containing aceticlastic methanogenic consortium, enriched from a municipal anaerobic digester. Two different experiments, "intermediate feed" and "starve and feed" were conducted by manipulating the methanogenic consortium with different amounts of acetate feeding, during 30 days of incubation. Disappearance of Aroclor 1242 in the microcosms was quantified using gas chromatography (GC). Significant differences in Aroclor 1242 removal between inoculated and uninoculated (control) microcosms were observed suggesting that the methanogenic consortium was responsible for Aroclor 1242 disappearance. However, GC-mass spectrometry (GC-MS) results could not confirm that disappearance of Aroclor 1242 was due to anaerobic dehalogenation. From another experiment, it was confirmed that removal of Aroclor 1242 was not due to evaporation losses during sample extraction. Toxicity of an aged Aroclor 1242 contaminated surface soil was evaluated on an aceticlastic methanogenic consortium, enriched from a municipal anaerobic digester. Microcosms were set up using different amounts of soil and inoculum. Total gas production in the microcosms was monitored during 30 days of incubation, using a glass syringe. Total methane production in the microcosms was quantitated using GC. Toxicity of the soil on the methanogenic inoculum was determined based on the decreased rate of methane production in the microcosms relative to non- soil containing controls. Compared to the control, there was reduction in total methane production in soil containing microcosms. Between 3-27% reduction in total methane production was noticed in microcosms containing different amounts of soil and consortium. Reduction in methane production seemed to increase with increasing amount of soil. Whether this decrease in methane production was due to toxicity of Aroclor 1242 on the methanogenic consortium or due possibly to the toxicity of trapped oxygen in the soil could not be determined. The rate of gas production in the soil microcosm was linear.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-12498-13011en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12498-13011/en
dc.identifier.urihttp://hdl.handle.net/10919/36501en
dc.publisherVirginia Techen
dc.relation.haspartSwatietd.PDFen
dc.relation.haspartcpt1.pdfen
dc.relation.haspartcpt2.pdfen
dc.relation.haspartcpt3.pdfen
dc.relation.haspartcpt4.pdfen
dc.relation.haspartcpt5.pdfen
dc.relation.haspartcpt6.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectPCBsen
dc.subjectbioremediationen
dc.subjectcontaminated surface soilen
dc.subjectmethanogenic consortium.en
dc.titleBioremediation of Pcb Contaminated Surface Soil: A Microcosm Studyen
dc.typeThesisen
thesis.degree.disciplineCrop and Soil Environmental Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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