{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/114730"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/114730","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"The effect of operational parameters on the dewatering characteristics of municipal wastewater sludges","abstract":"This research study examined the effect operational parameters, dissolved oxygen (D.O.) and food to microorganism ratio (F:M ratio) had on the thickening and dewatering from laboratory-scale and full-scale activated sludge treatment processes. Differences observed in sludge thickening and dewatering at CWWTP and BWWTP were investigated. Data was collected and operational parameters at full-scale facilities monitored. A laboratory-scale activated sludge reactor was constructed and operated on line with the CWWTP, which experienced filamentous bulking conditions since startup and operational parameters of the reactor monitored. Laboratory-scale experiments involved varying mixed liquor D.O. concentration and mean cell residence time (MCRT) and observing the resultant sludge thickening and dewatering characteristics. Increase in mixed liquor D.O. concentration, F:M ratio and reduction of MCRT at CWWTP resulted in improved sludge thickening and dewatering performance. Results showed sludge thickening characteristics were enhanced at D.O. concentrations greater than 3.0 mg/1 and less favorable at D.O. concentrations less than 2.0 mg/1. No trend correlation existed between aeration basin D.O. concentration and sludge dewatering resistance in the range of 3.0 to 7.0 mg/1. Correlation between laboratory-scale and full-scale activated sludge systems demonstrated that laboratory-scale reactor units can be. utilized to predict plant operational changes in relation to sludge thickening and dewatering performance.","abstract_html":"This research study examined the effect operational parameters, dissolved oxygen (D.O.) and food to microorganism ratio (F:M ratio) had on the thickening and dewatering from laboratory-scale and full-scale activated sludge treatment processes. Differences observed in sludge thickening and dewatering at CWWTP and BWWTP were investigated. Data was collected and operational parameters at full-scale facilities monitored. A laboratory-scale activated sludge reactor was constructed and operated on line with the CWWTP, which experienced filamentous bulking conditions since startup and operational parameters of the reactor monitored. Laboratory-scale experiments involved varying mixed liquor D.O. concentration and mean cell residence time (MCRT) and observing the resultant sludge thickening and dewatering characteristics. Increase in mixed liquor D.O. concentration, F:M ratio and reduction of MCRT at CWWTP resulted in improved sludge thickening and dewatering performance. Results showed sludge thickening characteristics were enhanced at D.O. concentrations greater than 3.0 mg/1 and less favorable at D.O. concentrations less than 2.0 mg/1. No trend correlation existed between aeration basin D.O. concentration and sludge dewatering resistance in the range of 3.0 to 7.0 mg/1. Correlation between laboratory-scale and full-scale activated sludge systems demonstrated that laboratory-scale reactor units can be. utilized to predict plant operational changes in relation to sludge thickening and dewatering performance.","abstract_has_math":false,"creators":["Adam, Robert W. (Robert William)"],"institution":"Virginia Polytechnic Institute and State University","degree_name":"M. S.","degree_level":"masters","degree_discipline":"Sanitary Engineering","degree_department":"Sanitary Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1983,"date_issued":"1983","date_published":"1983","updated_at":"2026-07-22T22:19:53Z","subjects":[],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10919/114730","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.department","label":"Department","values":["Sanitary Engineering"]},{"key":"dc:creator","label":"Author","values":["Adam, Robert W. 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Differences observed in sludge thickening and dewatering at CWWTP and BWWTP were investigated. Data was collected and operational parameters at full-scale facilities monitored. A laboratory-scale activated sludge reactor was constructed and operated on line with the CWWTP, which experienced filamentous bulking conditions since startup and operational parameters of the reactor monitored. Laboratory-scale experiments involved varying mixed liquor D.O. concentration and mean cell residence time (MCRT) and observing the resultant sludge thickening and dewatering characteristics. Increase in mixed liquor D.O. concentration, F:M ratio and reduction of MCRT at CWWTP resulted in improved sludge thickening and dewatering performance. Results showed sludge thickening characteristics were enhanced at D.O. concentrations greater than 3.0 mg/1 and less favorable at D.O. concentrations less than 2.0 mg/1. No trend correlation existed between aeration basin D.O. concentration and sludge dewatering resistance in the range of 3.0 to 7.0 mg/1. Correlation between laboratory-scale and full-scale activated sludge systems demonstrated that laboratory-scale reactor units can be. utilized to predict plant operational changes in relation to sludge thickening and dewatering performance."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["M. S."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The effect of operational parameters on the dewatering characteristics of municipal wastewater sludges"]}]}],"canonical_facts":{"dc:contributor.department":["Sanitary Engineering"],"dc:creator":["Adam, Robert W. (Robert William)"],"dc:date.accessioned":["2023-04-20T14:53:55Z"],"dc:date.available":["2023-04-20T14:53:55Z"],"dc:date.issued":["1983"],"dc:description.abstract":["This research study examined the effect operational parameters, dissolved oxygen (D.O.) and food to microorganism ratio (F:M ratio) had on the thickening and dewatering from laboratory-scale and full-scale activated sludge treatment processes. Differences observed in sludge thickening and dewatering at CWWTP and BWWTP were investigated. Data was collected and operational parameters at full-scale facilities monitored. A laboratory-scale activated sludge reactor was constructed and operated on line with the CWWTP, which experienced filamentous bulking conditions since startup and operational parameters of the reactor monitored. Laboratory-scale experiments involved varying mixed liquor D.O. concentration and mean cell residence time (MCRT) and observing the resultant sludge thickening and dewatering characteristics. Increase in mixed liquor D.O. concentration, F:M ratio and reduction of MCRT at CWWTP resulted in improved sludge thickening and dewatering performance. Results showed sludge thickening characteristics were enhanced at D.O. concentrations greater than 3.0 mg/1 and less favorable at D.O. concentrations less than 2.0 mg/1. No trend correlation existed between aeration basin D.O. concentration and sludge dewatering resistance in the range of 3.0 to 7.0 mg/1. Correlation between laboratory-scale and full-scale activated sludge systems demonstrated that laboratory-scale reactor units can be. utilized to predict plant operational changes in relation to sludge thickening and dewatering performance."],"dc:description.degree":["M. 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