The effect of the type, size, position and recycle ratio of the anoxic zone on low F/M filament bulking in nitrogen removal activated sludge systems

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dc.contributor.advisorEkama, George Aen_ZA
dc.contributor.authorHulsman, Andrew Charlesen_ZA
dc.date.accessioned2014-10-11T11:56:46Z
dc.date.available2014-10-11T11:56:46Z
dc.date.issued1992en_ZA
dc.descriptionIncludes bibliography.en_ZA
dc.description.abstractFilamentous bulking, which causes deterioration in sludge settleability has been shown, in two nation-wide surveys to be a problem of considerable proportions. Poor sludge settleability in the secondary clarifier limits the daily flow and load that can be treated in activated sludge wastewater treatment plants. Controlling sludge settleability to relatively low levels i.e. Diluted Sludge Volume Index (DSVI < 100 rnl/g) by controlling filamentous organism proliferation would allow increased daily flow and loads by up to 100 on existing activated sludge wastewater treatment plants. From the two surveys, Blackbeard et al. (1986,1988) found that mainly six filamentous organisms tended to dominate in activated sludges in N and N&P removal plants i.e. types 0092, 0041, 0675, 1851, 0914 and Microthrix parvicella. Four of these six filaments are classified by Jenkins et al (1984) as low Food/Micro-organism (low F/M) filaments. At the University of Cape Town and in a 4 year research programme (1986 to 1989) Gabb et al (1989a) investigated specific methods to control low F /M filament proliferation. Traditionally the promoted specific bulking control method was inclusion of either an anoxic or aerobic selector at the head of the wastewater treatment plant. Gabb et al (1989a) found that selectors did not control low F/M filament proliferation but that continuous aeration did. They concluded that the presence of anoxic and aerobic zones in a treatment plant was an important factor in low F/M filament proliferation. In 1989 a second research programme was initiated at the University of Cape Town to identify the factors that influence low F/M filament proliferation. Completed research thus far has established inter alia that fully anoxic and fully aerobic conditions successfully control low F/M filament proliferation but that alternating anoxic-aerobic conditions in single reactor intermittent aeration systems promoted proliferation. The research presented in this thesis focuses on the interchange between anoxic and aerobic conditions in nitrogen removal systems and its effect on low F/M filament proliferation.en_ZA
dc.identifier.apacitationHulsman, A. C. (1992). <i>The effect of the type, size, position and recycle ratio of the anoxic zone on low F/M filament bulking in nitrogen 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/11427/8302en_ZA
dc.identifier.chicagocitationHulsman, Andrew Charles. <i>"The effect of the type, size, position and recycle ratio of the anoxic zone on low F/M filament bulking in nitrogen removal activated sludge systems."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1992. http://hdl.handle.net/11427/8302en_ZA
dc.identifier.citationHulsman, A. 1992. The effect of the type, size, position and recycle ratio of the anoxic zone on low F/M filament bulking in nitrogen removal activated sludge systems. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Hulsman, Andrew Charles AB - Filamentous bulking, which causes deterioration in sludge settleability has been shown, in two nation-wide surveys to be a problem of considerable proportions. Poor sludge settleability in the secondary clarifier limits the daily flow and load that can be treated in activated sludge wastewater treatment plants. Controlling sludge settleability to relatively low levels i.e. Diluted Sludge Volume Index (DSVI < 100 rnl/g) by controlling filamentous organism proliferation would allow increased daily flow and loads by up to 100 on existing activated sludge wastewater treatment plants. From the two surveys, Blackbeard et al. (1986,1988) found that mainly six filamentous organisms tended to dominate in activated sludges in N and N&P removal plants i.e. types 0092, 0041, 0675, 1851, 0914 and Microthrix parvicella. Four of these six filaments are classified by Jenkins et al (1984) as low Food/Micro-organism (low F/M) filaments. At the University of Cape Town and in a 4 year research programme (1986 to 1989) Gabb et al (1989a) investigated specific methods to control low F /M filament proliferation. Traditionally the promoted specific bulking control method was inclusion of either an anoxic or aerobic selector at the head of the wastewater treatment plant. Gabb et al (1989a) found that selectors did not control low F/M filament proliferation but that continuous aeration did. They concluded that the presence of anoxic and aerobic zones in a treatment plant was an important factor in low F/M filament proliferation. In 1989 a second research programme was initiated at the University of Cape Town to identify the factors that influence low F/M filament proliferation. Completed research thus far has established inter alia that fully anoxic and fully aerobic conditions successfully control low F/M filament proliferation but that alternating anoxic-aerobic conditions in single reactor intermittent aeration systems promoted proliferation. The research presented in this thesis focuses on the interchange between anoxic and aerobic conditions in nitrogen removal systems and its effect on low F/M filament proliferation. DA - 1992 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1992 T1 - The effect of the type, size, position and recycle ratio of the anoxic zone on low F/M filament bulking in nitrogen removal activated sludge systems TI - The effect of the type, size, position and recycle ratio of the anoxic zone on low F/M filament bulking in nitrogen removal activated sludge systems UR - http://hdl.handle.net/11427/8302 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/8302
dc.identifier.vancouvercitationHulsman AC. The effect of the type, size, position and recycle ratio of the anoxic zone on low F/M filament bulking in nitrogen removal activated sludge systems. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1992 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/8302en_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.titleThe effect of the type, size, position and recycle ratio of the anoxic zone on low F/M filament bulking in nitrogen removal activated sludge systemsen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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