The effects of pH on aerobic sludge digestion

dc.contributor.authorMoore, Herbert Randolphen
dc.contributor.departmentSanitary Engineeringen
dc.date.accessioned2016-04-21T15:35:14Zen
dc.date.available2016-04-21T15:35:14Zen
dc.date.issued1970en
dc.description.abstractBatch studies to determine the effects of pH on aerobic digestion of waste activated sludge were performed using a detention time of at least 20 days. Total and volatile solids reductions were not affected over a pH range from 3.5 to 9.5. Somewhat greater solids reductions were realized when pH was held constant rather than allowed to vary as occurs with normal aerobic digestion. High reductions in mixed liquor BOD were consistent among digesters over the pH range investigated, however, sludge digested 23 days at pH 9.5 developed a putrescible odor when aeration was discontinued for 24 hours. Cellular carbohydrate and cellular protein accumulated during digestion, but no distinct relation to pH 1 evel was obvious although cellular carbohydrate showed a slightly greater accumulation with lower pH. Striking improvement in the settleability, drainability and filterability of sludge digested at pH 3.5 occurred. This effect was attributed to the development of an - overwhelming protozoan population which caused observed improvement in the flocculation characteristics of the sludge.en
dc.description.degreeMaster of Scienceen
dc.format.extentvii, 72 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/70545en
dc.language.isoenen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 38532414en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1970.M6en
dc.titleThe effects of pH on aerobic sludge digestionen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineSanitary Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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