Engineering aspects of calcium carbonate and magnesium hydroxide precipitation in waste water reclamation

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dc.contributor.advisorMarais, Gerrit van Rooyenen_ZA
dc.contributor.authorWiechers, Hermannus Nikolaas Sybrandusen_ZA
dc.date.accessioned2016-03-21T19:05:10Z
dc.date.available2016-03-21T19:05:10Z
dc.date.issued1978en_ZA
dc.descriptionIncludes bibliography.en_ZA
dc.description.abstractThis thesis attempts to resolve some of the major problems associated with lime treatment in waste water reclamation. The contribution to knowledge is briefly outlined below. One of the major problems associated with lime treatment is the instability of lime-treated effluent, which may result in serious calcium carbonate scale formation problems. In the thesis this instability is attributed to two fundamental causes, (1) Incomplete precipitation, i.e. a kinetic problem. (2) The unintentional absorption of carbon dioxide from the air by the highly alkaline lime-treated effluent, i.e. a contamination problem. Calcium carbonate and magnesium hydroxide precipitation are time dependent. As a consequence of this time dependency unstable effluent may be produced under reaction conditions commonly encountered in practice. An exhaustive study identified the major factors affecting the precipitation kinetics. Reaction system conditions required for producing a stable effluent are, (1) Lime slurry and sludge, in that sequence, must be thoroughly mixed with the waste water, preferably by means of in-line static mixers, before discharge to a completely stirred tank reactor. (2) A completely stirred tank reactor with a minimum mean residence time of two minutes must be provided for the dissolution and precipitation reactions to go as near to completion as possible. (3) The reactor contents must have a sludge concentration of the order of 10 000 mg l⁻¹.en_ZA
dc.identifier.apacitationWiechers, H. N. S. (1978). <i>Engineering aspects of calcium carbonate and magnesium hydroxide precipitation in waste water reclamation</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Water Research Group. Retrieved from http://hdl.handle.net/11427/18033en_ZA
dc.identifier.chicagocitationWiechers, Hermannus Nikolaas Sybrandus. <i>"Engineering aspects of calcium carbonate and magnesium hydroxide precipitation in waste water reclamation."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Water Research Group, 1978. http://hdl.handle.net/11427/18033en_ZA
dc.identifier.citationWiechers, H. 1978. Engineering aspects of calcium carbonate and magnesium hydroxide precipitation in waste water reclamation. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Wiechers, Hermannus Nikolaas Sybrandus AB - This thesis attempts to resolve some of the major problems associated with lime treatment in waste water reclamation. The contribution to knowledge is briefly outlined below. One of the major problems associated with lime treatment is the instability of lime-treated effluent, which may result in serious calcium carbonate scale formation problems. In the thesis this instability is attributed to two fundamental causes, (1) Incomplete precipitation, i.e. a kinetic problem. (2) The unintentional absorption of carbon dioxide from the air by the highly alkaline lime-treated effluent, i.e. a contamination problem. Calcium carbonate and magnesium hydroxide precipitation are time dependent. As a consequence of this time dependency unstable effluent may be produced under reaction conditions commonly encountered in practice. An exhaustive study identified the major factors affecting the precipitation kinetics. Reaction system conditions required for producing a stable effluent are, (1) Lime slurry and sludge, in that sequence, must be thoroughly mixed with the waste water, preferably by means of in-line static mixers, before discharge to a completely stirred tank reactor. (2) A completely stirred tank reactor with a minimum mean residence time of two minutes must be provided for the dissolution and precipitation reactions to go as near to completion as possible. (3) The reactor contents must have a sludge concentration of the order of 10 000 mg l⁻¹. DA - 1978 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1978 T1 - Engineering aspects of calcium carbonate and magnesium hydroxide precipitation in waste water reclamation TI - Engineering aspects of calcium carbonate and magnesium hydroxide precipitation in waste water reclamation UR - http://hdl.handle.net/11427/18033 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18033
dc.identifier.vancouvercitationWiechers HNS. Engineering aspects of calcium carbonate and magnesium hydroxide precipitation in waste water reclamation. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Water Research Group, 1978 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18033en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentWater Research Groupen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherWaste water reclamationen_ZA
dc.titleEngineering aspects of calcium carbonate and magnesium hydroxide precipitation in waste water reclamationen_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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