Modelling organic material in activated sludge systems

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dc.contributor.authorEkama, G A
dc.contributor.authorWentzel, M C
dc.date.accessioned2018-01-11T14:01:47Z
dc.date.available2018-01-11T14:01:47Z
dc.date.issued2004
dc.date.updated2017-11-13T14:00:46Z
dc.description.abstractA simple predictive model for the activated sludge reactor inorganic suspended solids (ISS) concentration is presented. It is based on the accumulation of influent ISS in the reactor and an ordinary heterotrophic organism (OHO) ISS content (fiOHO) of 0.15 mg ISS/mgOHOVSS and a variable phosphate accumulating organism (PAO) ISS content (fiPAO) proportional to their P content (fXBGP). The model is validated with data from 21 investigations conducted over the past 15 years on 30 aerobic and anoxic-aerobic nitrification denitrification (ND) systems and 18 anaerobic-anoxic-aerobic ND biological excess P removal (BEPR) systems variously fed artificial and real wastewater and operated from 3 to 20 d sludge age. The predicted reactor VSS/TSS ratio reflects the observed relative sensitivity to sludge age, which is low, and to BEPR, which is high. For effective use of the model for design, two significant issues require attention: measurement of the influent ISS concentration, which is not commonly done in wastewater characterisation analyses; and estimating a priori the P content of PAOs (fXBGP), which can vary considerably depending on the extent of anoxic P uptake BEPR that takes place in the system. Some guidance on selection of the mixed liquor VSS/TSS ratio for design is given.
dc.identifier.apacitationEkama, G. A., & Wentzel, M. C. (2004). Modelling organic material in activated sludge systems. <i>Water SA</i>, http://hdl.handle.net/11427/26807en_ZA
dc.identifier.chicagocitationEkama, G A, and M C Wentzel "Modelling organic material in activated sludge systems." <i>Water SA</i> (2004) http://hdl.handle.net/11427/26807en_ZA
dc.identifier.citationEkama, G. A., & Wentzel, M. C. (2004). Modelling inorganic material in activated sludge systems. Water SA, 30(2), 153-174.
dc.identifier.ris TY - Journal Article AU - Ekama, G A AU - Wentzel, M C AB - A simple predictive model for the activated sludge reactor inorganic suspended solids (ISS) concentration is presented. It is based on the accumulation of influent ISS in the reactor and an ordinary heterotrophic organism (OHO) ISS content (fiOHO) of 0.15 mg ISS/mgOHOVSS and a variable phosphate accumulating organism (PAO) ISS content (fiPAO) proportional to their P content (fXBGP). The model is validated with data from 21 investigations conducted over the past 15 years on 30 aerobic and anoxic-aerobic nitrification denitrification (ND) systems and 18 anaerobic-anoxic-aerobic ND biological excess P removal (BEPR) systems variously fed artificial and real wastewater and operated from 3 to 20 d sludge age. The predicted reactor VSS/TSS ratio reflects the observed relative sensitivity to sludge age, which is low, and to BEPR, which is high. For effective use of the model for design, two significant issues require attention: measurement of the influent ISS concentration, which is not commonly done in wastewater characterisation analyses; and estimating a priori the P content of PAOs (fXBGP), which can vary considerably depending on the extent of anoxic P uptake BEPR that takes place in the system. Some guidance on selection of the mixed liquor VSS/TSS ratio for design is given. DA - 2004 DB - OpenUCT DP - University of Cape Town J1 - Water SA LK - https://open.uct.ac.za PB - University of Cape Town PY - 2004 T1 - Modelling organic material in activated sludge systems TI - Modelling organic material in activated sludge systems UR - http://hdl.handle.net/11427/26807 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/26807
dc.identifier.vancouvercitationEkama GA, Wentzel MC. Modelling organic material in activated sludge systems. Water SA. 2004; http://hdl.handle.net/11427/26807.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Civil Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.sourceWater SA
dc.source.urihttps://www.ajol.info/index.php/wsa/index
dc.subject.otheractivated sludge
dc.subject.otherinorganic suspended solids
dc.subject.othermodelling
dc.subject.otherbiological nutrient removal
dc.titleModelling organic material in activated sludge systems
dc.typeJournal Article
uct.type.filetypeText
uct.type.filetypeImage
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