[{"key":"dc.contributor.author","value":"Huang, Jifei","language":null},{"key":"dc.date.accessioned","value":"2009-02-24T19:57:57Z","language":null},{"key":"dc.date.available","value":"2009-02-24T19:57:57Z","language":null},{"key":"dc.date.issued","value":"1994","language":null},{"key":"dc.identifier.uri","value":"http:\/\/hdl.handle.net\/2429\/5004","language":null},{"key":"dc.description.abstract","value":"Calcium has been found to be involved in formation and development of the\r\nbioflims for many species of bacteria, but effects of calcium on anaerobic bioflims for\r\nindustrial application have rarely been reported. In this study, a mixed-culture of anaerobic\r\nbacterial bioflims were grown in lactose cultural medium with various calcium\r\nconcentrations -- 1.2, 80, 100, 120, 170 and 230 mg\/I. Specially designed CSTR reactors\r\nwere used. The temperature and pH in the reactors were controlled at 35 \u00b0C and pH 4.5\r\nfor optimal growth of acidogenic bacteria. The influence of calcium on biofllm dry mass,\r\ntotal organic carbon, immobilized calcium concentration and bioflim specific activity were\r\nmeasured.\r\nThe biofllm mass accumulation was increased by the presence of calcium in the\r\ngrowth medium when calcium concentration was not higher than 120 mg\/I. Calcium\r\naccumulated in the bioflims increased in proportion to the calcium level in the feed. The\r\nbioflims for an increased input calcium concentration showed a trend of decrease in\r\nspecific activity. The biofllms with a thickness of less than 0.5 mm had the highest specific\r\nactivity. The optimum calcium concentration for the substrate consumption by the biofilms\r\nwas 100 -120 mg\/i.\r\nThe bioflims transferred from higher calcium medium to lower calcium medium\r\nwere more susceptible to sioughing from their support surfaces, indicating calcium\u2019s role\r\nin the stability of the bioflim structure.","language":"en"},{"key":"dc.format.extent","value":"1807665 bytes","language":null},{"key":"dc.format.mimetype","value":"application\/pdf","language":null},{"key":"dc.language.iso","value":"eng","language":"en"},{"key":"dc.publisher","value":"University of British Columbia","language":null},{"key":"dc.rights","value":"For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https:\/\/open.library.ubc.ca\/terms_of_use.","language":null},{"key":"dc.title","value":"Effects of calcium on anaerobic acidogenic biofilms","language":"en"},{"key":"dc.type","value":"Text","language":null},{"key":"dc.degree.name","value":"Master of Applied Science - MASc","language":"en"},{"key":"dc.degree.discipline","value":"Chemical and Biological Engineering","language":"en"},{"key":"dc.degree.grantor","value":"University of British Columbia","language":null},{"key":"dc.date.graduation","value":"1994-05","language":"en"},{"key":"dc.type.text","value":"Thesis\/Dissertation","language":"en"},{"key":"dc.description.affiliation","value":"Applied Science, Faculty of","language":null},{"key":"dc.description.affiliation","value":"Chemical and Biological Engineering, Department of","language":null},{"key":"dc.degree.campus","value":"UBCV","language":"en"},{"key":"dc.description.scholarlevel","value":"Graduate","language":"en"}]