Effects of Substrate Concentrations on the Growth of Heterotrophic Bacteria and Algae in Secondary Facultative Ponds

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dc.contributor.authorKayombo, S.
dc.contributor.authorMbwette, T. S. A.
dc.contributor.authorKatima, Jamidu H. Y.
dc.contributor.authorJørgensen, S. E.
dc.date.accessioned2016-05-27T13:32:59Z
dc.date.available2016-05-27T13:32:59Z
dc.date.issued2003
dc.description.abstractThis paper presents the effect of substrate concentration on the growth of a mixed culture of algae and heterotrophic bacteria in secondary facultative ponds (SFPs) utilizing settled domestic sewage as a sole source of organic carbon. The growth of the mixed culture was studied at the concentrations ranging between 200 and 800 mg COD/l in a series of batch chemostat reactors. From the laboratory data, the specific growth rate (m) was determined using the modified Gompertz model. The maximum specific growth rate (mmax) and half saturation coefficients (Ks) were calculated using the Monod kinetic equation. The maximum observed growth rate (mmax) for heterotrophic bacteria was 3.8 day 1 with Ks of 200 mg COD/l. The mmax for algal biomass based on suspended volatile solids was 2.7 day 1 with Ks of 110 mg COD/l. The mmax of algae based on the chlorophyll-a was 3.5 day 1 at Ks of 50 mg COD/l. The observed specific substrate removal by heterotrophic bacteria varied between the concentrations of substrate used and the average value was 0.82 (mg COD/mg biomass). The specific substrate utilization rate in the bioreactors was direct proportional to the specific growth rate. Hence, the determined Monod kinetic parameters are useful for the definition of the operation of SFPs.en_US
dc.identifier.citationKayombo, S., Mbwette, T.S.A., Katima, J.H.Y. and Jorgensen, S.E., 2003. Effects of substrate concentrations on the growth of heterotrophic bacteria and algae in secondary facultative ponds. Water Research, 37(12), pp.2937-2943.en_US
dc.identifier.doi10.1016/S0043-1354(03)00014-9
dc.identifier.urihttp://hdl.handle.net/20.500.11810/2296
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectHeterotrophic bacteriaen_US
dc.subjectHalf saturation coefficienten_US
dc.subjectMaximum growth rateen_US
dc.subjectSecondary facultative ponden_US
dc.subjectSpecific substrate removalen_US
dc.titleEffects of Substrate Concentrations on the Growth of Heterotrophic Bacteria and Algae in Secondary Facultative Pondsen_US
dc.typeJournal Article, Peer Revieweden_US
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