Design and performance of BNR activated sludge systems with flat sheet membranes for solid-liquid separation

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dc.contributor.advisorEkama, George Aen_ZA
dc.contributor.advisorWentzel,Mark C,en_ZA
dc.contributor.authorDu Toit, Geoff J Gen_ZA
dc.date.accessioned2014-07-31T10:29:44Z
dc.date.available2014-07-31T10:29:44Z
dc.date.issued2006en_ZA
dc.descriptionIncludes bibliographical references.
dc.description.abstractWastewater treatment technologies have developed out of the need to protect receiving water bodies from the increasingly concentrated municipal and industrial waste streams generated through human activity. Of the methods available to clean wastewaters, biological nutrient removal (BNR) activated sludge (AS) is applied throughout South Africa and internationally as it has many advantages, notably it is cheaper to operate, does not introduce salinity into the water and is a simple and robust process. One of the key steps in the BNR AS process is the separation of biomass from the water. This is traditionally achieved by means of secondary settling tanks (SSTs), however recently the use of membranes for solid-liquid separation has gained popularity for the following reasons: Membranes are able to retain all solids and thus are insensitive to the settling characteristics of sludges, • they can be run at high concentrations and hence smaller reactor volumes are required, • membranes can produce a guaranteed high quality effluent free of pathogens and in some cases viruses too. • Additionally smaller reactor volumes and the obviation of SSTs allow a substantial wastewater treatment plant footprint reduction. Hence the combination of membranes in BNR AS is being increasingly applied. where much research has been conducted on the performance of membranes. The majority of the research has focused on the physical membrane performance, investigating the mechanisms of fouling, or on the membrane biological reactor (MBR) performance in removing organic compounds or nitrogen compounds from wastewater. There are however few case studies investigating BNR using membranes despite speculation that the inclusion of membranes may indeed affect the nature of the activated sludge biomass (Witzig et al., 2002).en_ZA
dc.identifier.apacitationDu Toit, G. J. G. (2006). <i>Design and performance of BNR activated sludge systems with flat sheet membranes for solid-liquid separation</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering. Retrieved from http://hdl.handle.net/11427/5061en_ZA
dc.identifier.chicagocitationDu Toit, Geoff J G. <i>"Design and performance of BNR activated sludge systems with flat sheet membranes for solid-liquid separation."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 2006. http://hdl.handle.net/11427/5061en_ZA
dc.identifier.citationDu Toit, G. 2006. Design and performance of BNR activated sludge systems with flat sheet membranes for solid-liquid separation. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Du Toit, Geoff J G AB - Wastewater treatment technologies have developed out of the need to protect receiving water bodies from the increasingly concentrated municipal and industrial waste streams generated through human activity. Of the methods available to clean wastewaters, biological nutrient removal (BNR) activated sludge (AS) is applied throughout South Africa and internationally as it has many advantages, notably it is cheaper to operate, does not introduce salinity into the water and is a simple and robust process. One of the key steps in the BNR AS process is the separation of biomass from the water. This is traditionally achieved by means of secondary settling tanks (SSTs), however recently the use of membranes for solid-liquid separation has gained popularity for the following reasons: Membranes are able to retain all solids and thus are insensitive to the settling characteristics of sludges, • they can be run at high concentrations and hence smaller reactor volumes are required, • membranes can produce a guaranteed high quality effluent free of pathogens and in some cases viruses too. • Additionally smaller reactor volumes and the obviation of SSTs allow a substantial wastewater treatment plant footprint reduction. Hence the combination of membranes in BNR AS is being increasingly applied. where much research has been conducted on the performance of membranes. The majority of the research has focused on the physical membrane performance, investigating the mechanisms of fouling, or on the membrane biological reactor (MBR) performance in removing organic compounds or nitrogen compounds from wastewater. There are however few case studies investigating BNR using membranes despite speculation that the inclusion of membranes may indeed affect the nature of the activated sludge biomass (Witzig et al., 2002). DA - 2006 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2006 T1 - Design and performance of BNR activated sludge systems with flat sheet membranes for solid-liquid separation TI - Design and performance of BNR activated sludge systems with flat sheet membranes for solid-liquid separation UR - http://hdl.handle.net/11427/5061 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/5061
dc.identifier.vancouvercitationDu Toit GJG. Design and performance of BNR activated sludge systems with flat sheet membranes for solid-liquid separation. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 2006 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/5061en_ZA
dc.language.isoengen_ZA
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.titleDesign and performance of BNR activated sludge systems with flat sheet membranes for solid-liquid separationen_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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