Causes and control of low F/M bulking in long sludge age nutrient removal activated sludge systems

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dc.contributor.authorCasey, Timothy Gervaseen_ZA
dc.date.accessioned2014-10-11T11:57:41Z
dc.date.available2014-10-11T11:57:41Z
dc.date.issued1993en_ZA
dc.descriptionIncludes bibliography.en_ZA
dc.description.abstractA problem plaguing the greater proportion of nutrient removal activated sludge systems treating municipal sewage, is the prolific growth of :filamentous organisms (bulking), which inhibits the rate of sludge settling in the clarifier (secondary settling) stage of treatment and reduces plant throughput. To find the causes of :filament proliferation, a four-stage investigation was conducted: (1) A review of literature indicated that the promoted method for control of bulking in carbonaceous removal systems (the selector reactor) does not control bulking in nutrient removal systems. (2) From a laboratory-scale experimental programme it was concluded that low F /M filaments proliferate when sludge is subjected to alternating anoxic-aerobic conditions with nitrite present. (3) A review of the biochemistry of respiration led to the formulation of a biochemical model for facultative organism respiration, an important aspect of which is a series of mechanisms that give rise to inhibition of aerobic respiration following anoxic conditions. Inhibition of respiration was measured in activated sludge with aerobic batch test procedures. ( 4) Application of the biochemical model to filaments and floe-formers allowed the formulation of a biochemical/microbiological (bulking) model to describe the prolific growth of filamentous organisms. The model was tested and verified at laboratory-scale.en_ZA
dc.identifier.apacitationCasey, T. G. (1993). <i>Causes and control of low F/M bulking in long sludge age nutrient removal activated sludge systems</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering. Retrieved from http://hdl.handle.net/11427/8305en_ZA
dc.identifier.chicagocitationCasey, Timothy Gervase. <i>"Causes and control of low F/M bulking in long sludge age nutrient removal activated sludge systems."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1993. http://hdl.handle.net/11427/8305en_ZA
dc.identifier.citationCasey, T. 1993. Causes and control of low F/M bulking in long sludge age nutrient removal activated sludge systems. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Casey, Timothy Gervase AB - A problem plaguing the greater proportion of nutrient removal activated sludge systems treating municipal sewage, is the prolific growth of :filamentous organisms (bulking), which inhibits the rate of sludge settling in the clarifier (secondary settling) stage of treatment and reduces plant throughput. To find the causes of :filament proliferation, a four-stage investigation was conducted: (1) A review of literature indicated that the promoted method for control of bulking in carbonaceous removal systems (the selector reactor) does not control bulking in nutrient removal systems. (2) From a laboratory-scale experimental programme it was concluded that low F /M filaments proliferate when sludge is subjected to alternating anoxic-aerobic conditions with nitrite present. (3) A review of the biochemistry of respiration led to the formulation of a biochemical model for facultative organism respiration, an important aspect of which is a series of mechanisms that give rise to inhibition of aerobic respiration following anoxic conditions. Inhibition of respiration was measured in activated sludge with aerobic batch test procedures. ( 4) Application of the biochemical model to filaments and floe-formers allowed the formulation of a biochemical/microbiological (bulking) model to describe the prolific growth of filamentous organisms. The model was tested and verified at laboratory-scale. DA - 1993 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1993 T1 - Causes and control of low F/M bulking in long sludge age nutrient removal activated sludge systems TI - Causes and control of low F/M bulking in long sludge age nutrient removal activated sludge systems UR - http://hdl.handle.net/11427/8305 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/8305
dc.identifier.vancouvercitationCasey TG. Causes and control of low F/M bulking in long sludge age nutrient removal activated sludge systems. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1993 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/8305en_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.subject.otherCivil Engineeringen_ZA
dc.titleCauses and control of low F/M bulking in long sludge age nutrient removal activated sludge systemsen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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