Dissolved air (pressure) flotation
| dc.contributor.advisor | Marais, G.v. R. | |
| dc.contributor.author | Bratby, John Raymond | |
| dc.date.accessioned | 2023-10-02T11:24:58Z | |
| dc.date.available | 2023-10-02T11:24:58Z | |
| dc.date.issued | 1973 | |
| dc.date.updated | 2023-10-02T11:24:34Z | |
| dc.description.abstract | It appears that, in the past, little attempt has been made to establish the basic parameters influencing the flotation process, or their inter-relationships, on a quantitative basis for the purpose of developing rational design procedures. This thesis investigates those parameters influencing solids removal and thickening by dissolved-air (pressure) flotation and the criteria pertaining to the design of flotation tanks for solids removal and thickening. A review of pertinent literature on flotation is presented. The historical development of flotation is given together with the theory of bubble-particle adhesion. Four common methods of flotation are compared and their inherent advantages and disadvantages are discussed. Dissolved-air (pressure) flotation, the method used in this investigation, is considered in greater detail by presenting established practical considerations for design. A pressure-saturation unit was developed in which all the compressed air supplied is dissolved into the saturator feed by continously recycling the air through a sparger, i.e. there is no air wastage. The air circulating pump operates within the pressurized circuit so that it pumps only against the hydrostatic head of water in the saturator. A vertical flow type flotation unit was developed which provides a counter current flow regime and a stable interface between the clear liquid and rising agglomerates. The accumulated agglomerates discharge freely and without mechanical assistance at the top of the unit. | |
| dc.identifier.apacitation | Bratby, J. R. (1973). <i>Dissolved air (pressure) flotation</i>. (). ,Faculty of Engineering and the Built Environment ,Department of Civil Engineering. Retrieved from http://hdl.handle.net/11427/39008 | en_ZA |
| dc.identifier.chicagocitation | Bratby, John Raymond. <i>"Dissolved air (pressure) flotation."</i> ., ,Faculty of Engineering and the Built Environment ,Department of Civil Engineering, 1973. http://hdl.handle.net/11427/39008 | en_ZA |
| dc.identifier.citation | Bratby, J.R. 1973. Dissolved air (pressure) flotation. . ,Faculty of Engineering and the Built Environment ,Department of Civil Engineering. http://hdl.handle.net/11427/39008 | en_ZA |
| dc.identifier.ris | TY - Master Thesis AU - Bratby, John Raymond AB - It appears that, in the past, little attempt has been made to establish the basic parameters influencing the flotation process, or their inter-relationships, on a quantitative basis for the purpose of developing rational design procedures. This thesis investigates those parameters influencing solids removal and thickening by dissolved-air (pressure) flotation and the criteria pertaining to the design of flotation tanks for solids removal and thickening. A review of pertinent literature on flotation is presented. The historical development of flotation is given together with the theory of bubble-particle adhesion. Four common methods of flotation are compared and their inherent advantages and disadvantages are discussed. Dissolved-air (pressure) flotation, the method used in this investigation, is considered in greater detail by presenting established practical considerations for design. A pressure-saturation unit was developed in which all the compressed air supplied is dissolved into the saturator feed by continously recycling the air through a sparger, i.e. there is no air wastage. The air circulating pump operates within the pressurized circuit so that it pumps only against the hydrostatic head of water in the saturator. A vertical flow type flotation unit was developed which provides a counter current flow regime and a stable interface between the clear liquid and rising agglomerates. The accumulated agglomerates discharge freely and without mechanical assistance at the top of the unit. DA - 1973 DB - OpenUCT DP - University of Cape Town KW - civil engineering LK - https://open.uct.ac.za PY - 1973 T1 - Dissolved air (pressure) flotation TI - Dissolved air (pressure) flotation UR - http://hdl.handle.net/11427/39008 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/39008 | |
| dc.identifier.vancouvercitation | Bratby JR. Dissolved air (pressure) flotation. []. ,Faculty of Engineering and the Built Environment ,Department of Civil Engineering, 1973 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/39008 | en_ZA |
| dc.language.rfc3066 | eng | |
| dc.publisher.department | Department of Civil Engineering | |
| dc.publisher.faculty | Faculty of Engineering and the Built Environment | |
| dc.subject | civil engineering | |
| dc.title | Dissolved air (pressure) flotation | |
| dc.type | Master Thesis | |
| dc.type.qualificationlevel | Masters | |
| dc.type.qualificationlevel | MSc |