Simultaneous minimisation of water and energy within a water and membrane network superstructure

Simple item page
dc.contributor.authorBuabeng-Baidoo, Esther
dc.date.accessioned2016-10-03T08:53:42Z
dc.date.available2016-10-03T08:53:42Z
dc.date.issued2016
dc.descriptionA dissertation submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering, 2015
dc.description.abstractThe scarcity of water and strict environmental regulations have made sustainable engineering a prime concern in the process and manufacturing industries. Water minimisation involves the reduction of freshwater use and effluent discharge in chemical plants. This is achieved through water reuse, water recycle and water regeneration. Optimisation of the water network (WN) superstructure considers all possible interconnections between water sources, water sinks and regenerator units (membrane systems). In most published works, membrane systems have been represented using the “black-box” approach, which uses a simplified linear model to represent the membrane systems. This approach does not give an accurate representation of the energy consumption and associated costs of the membrane systems. The work presented in this dissertation therefore looks at the incorporation of a detailed reverse osmosis network (RON) superstructure within a water network superstructure in order to simultaneously minimise water, energy, operating and capital costs. The WN consists of water sources, water sinks and reverse osmosis (RO) units for the partial treatment of the contaminated water. An overall mixed-integer nonlinear programming (MINLP) framework is developed, that simultaneously evaluates both water recycle/reuse and regeneration reuse/recycle opportunities. The solution obtained from optimisation provides the optimal connections between various units in the network arrangement, size and number of RO units, booster pumps as well as energy recovery turbines. The work looks at four cases in order to highlight the importance of including a detailed regeneration network within the water network instead of the traditional “black-box’’ model. The importance of using a variable removal ratio in the model is also highlighted by applying the work to a literature case study, which leads to a 28% reduction in freshwater consumption and 80% reduction in wastewater generation.en_ZA
dc.description.librarianGR2016en_ZA
dc.format.extentOnline resource (118 leaves)
dc.identifier.citationBuabeng-Baidoo, Esther (2016) Simultaneous minimisation of water and energy within a water and membrane network superstructure, University of Witwatersrand, Johannesburg, <http://wiredspace.wits.ac.za/handle/10539/21108>
dc.identifier.urihttp://hdl.handle.net/10539/21108
dc.language.isoenen_ZA
dc.subject.lcshWater--Distribution--Mathematical models
dc.subject.lcshWater-supply--Management
dc.subject.lcshMathematical optimization
dc.subject.lcshReverse osmosis
dc.subject.lcshMembrane filters
dc.subject.lcshWater reuse
dc.titleSimultaneous minimisation of water and energy within a water and membrane network superstructureen_ZA
dc.typeThesisen_ZA
Files
Original bundle
Now showing 1 - 2 of 2
No Thumbnail Available
Name:
Abstract.pdf
Size:
146.32 KB
Format:
Adobe Portable Document Format
Description:
Download
No Thumbnail Available
Name:
Dissertation (Esther).pdf
Size:
1.9 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
ETD Collection