Removal of microorganisms and proteins from sewage and industrial waste with chlorinated solvents

dc.contributor.authorDawson, Herbert Maxwellen
dc.contributor.committeechairBungay, Henry R. IIIen
dc.contributor.committeememberParsons, William A.en
dc.contributor.departmentSanitary Engineeringen
dc.date.accessioned2014-03-14T21:33:09Zen
dc.date.adate2010-04-07en
dc.date.available2014-03-14T21:33:09Zen
dc.date.issued1962-08-15en
dc.date.rdate2010-04-07en
dc.date.sdate2010-04-07en
dc.description.abstractVery few sewage and industrial waste treatment effluents are free from microorganisms and proteins. Such discharges require further treatment by the receiving stream and consequently lower stream quality. The object of this investigation was to evaluate chlorinated solvent processes for the removal of microorganisms, proteins, and other substances from sewage and other wastes. Six different chlorinated solvents were added to different waste samples in the ratio (by volume) of five percent solvent and 95 percent waste, mixed and allowed to settle for a specified period of time. The efficiency of the solvent extraction process was evaluated in terms of reduction of suspended solids, biochemical oxygen demand, and by increased weight of residue separable by sedimentation. The results showed that the process produced the following effects on settled sewage. Suspended solids were reduced by 85 percent, the weight of residue separable by sedimentation was increased 33 percent, and the biochemical oxygen demand was reduced 49 percent. The process was less effective for the treatment of raw sewage, trickling filter effluent, sewage lagoon effluent, or for separation of activated sludge. The variables investigated were temperature, pH and the solvent waste system. Temperature and pH appeared to have negligible effects on the extraction efficiency. The solvents employed were; chloroform, ethylene dichloride, chlorobenzene, carbon tetrachloride, trichloroethane, and dichloroisopropyl ether. Solvents with low vapor pressures and wastes with low concentrations of suspended solids appeared to be the most efficient system. The addition of 20 percent of butanol (by weight) to trichloroethane appeared to increase the extraction efficiency of trichloroethane. Bacterial counts made indicated that the solvent extraction process was affecting better than 90 percent removal of microorganisms from the waste samples. More research will be needed to completely evaluate chlorinated solvent processes for the removal of microorganisms, proteins, and other substances from sewage and other wastes.en
dc.description.degreeMaster of Scienceen
dc.format.extent59 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-04072010-020048en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04072010-020048/en
dc.identifier.urihttp://hdl.handle.net/10919/41958en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1962.D387.pdfen
dc.relation.isformatofOCLC# 22246349en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1962.D387en
dc.subject.lcshSewage disposalen
dc.subject.lcshSewage -- Purification -- Chlorinationen
dc.titleRemoval of microorganisms and proteins from sewage and industrial waste with chlorinated solventsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineSanitary Engineeringen
thesis.degree.grantorVirginia Polytechnic Instituteen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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