Process designs for novel pervaporation-based hybrid-processes to recover organic compounds from waste water
Lipnizki, Frank LU
; Hausmanns, Stephan
; Field, Robert W.
and Ten, Po Kiong
(1998)
DECHEMA-Jahrestagung 1998
p.298-298
- Abstract
- Introduction
An overview of the different hybrid-processes combining pervaporation with a conventional separation as a tool to recover organic compounds from waste water will be given. Analysing potential applications shows that pervaporation alone will rarely be economical due to the purity required nowadays in waste water treatment. The limitation on flux owing to the activity being the driving force of the pervaporation process, is a severe limitation at low contaminant concentrations. This limitation restricts the purity achievable with pervaporation. One solution to overcome these limitations is to integrate pervaporation into a package of different processes to form a range of ‘hybrid processes’.... (More) - Introduction
An overview of the different hybrid-processes combining pervaporation with a conventional separation as a tool to recover organic compounds from waste water will be given. Analysing potential applications shows that pervaporation alone will rarely be economical due to the purity required nowadays in waste water treatment. The limitation on flux owing to the activity being the driving force of the pervaporation process, is a severe limitation at low contaminant concentrations. This limitation restricts the purity achievable with pervaporation. One solution to overcome these limitations is to integrate pervaporation into a package of different processes to form a range of ‘hybrid processes’.
Aims
Virtually every separation process can be combined with a pervaporation process to form a hybrid process as long as it is capable of achieving a predefined task under optimised processes conditions. In waste water treatment, pervaporation will be, generally, applied as a pre-treatment before a final polishing step due to its driving force limitations. In cases where membranes with an appropriate selectivity are available the permeate can be treated by liquid-liquid phase separation and the recovered organic compound can be recycled, see Figure 1. Otherwise, the concentrated, and therefore volumetric reduced, waste stream has to be treated by less favourite alternatives such as incineration. In both cases the retentate is further treated by a polishing process. In this study the potentials of the following processes as polishing step within a pervaporation-based hybrid process will be analysed:
• Oxidation
• Electro-Chemical Destruction
Furthermore, a special case of hybrid processes combining two pervaporation units, one with ‘high-selectivity/low flux’ membranes and the other with ‘low-selectivity/high flux’ membranes is presented.
Methods and Results
The pervaporation unit is analysed using a simulation package developed at the University of Bath. In this simulation a ‘Finite Elements in Succession Method’ is applied to divide the membrane area of the pervaporation unit into small segments and to solve the mass, concentration and energy balance for each of these elements. In a parameter study the influence of different process parameters like e.g. temperatures, pressures and change over concentrations between the processes on the hybrid process will be discussed. The influence of different process parameters on the economics of the hybrid process is analysed in a sensitivity analysis using spreadsheet simulations.
Conclusion
The different hybrid processes analysed have the potential to be integrated into waste treatment systems to meet future environmental targets. Design procedure taking techno-economic aspects into account have been established to provide case-specific solutions.
(Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/95f35128-774d-4871-90ca-8e50a5007686
- author
- Lipnizki, Frank
LU
; Hausmanns, Stephan
; Field, Robert W.
and Ten, Po Kiong
- publishing date
- 1998-05-26
- type
- Contribution to conference
- publication status
- published
- subject
- keywords
- Membranes, Pervaporation, Hybrid processes
- pages
- 1 pages
- conference name
- DECHEMA-Jahrestagung 1998
- conference location
- Wiesbaden, Germany
- conference dates
- 1998-05-26 - 1998-05-28
- language
- English
- LU publication?
- no
- id
- 95f35128-774d-4871-90ca-8e50a5007686
- date added to LUP
- 2020-01-10 10:14:35
- date last changed
- 2020-10-24 02:19:56
@misc{95f35128-774d-4871-90ca-8e50a5007686,
abstract = {{Introduction<br/><br/>An overview of the different hybrid-processes combining pervaporation with a conventional separation as a tool to recover organic compounds from waste water will be given. Analysing potential applications shows that pervaporation alone will rarely be economical due to the purity required nowadays in waste water treatment. The limitation on flux owing to the activity being the driving force of the pervaporation process, is a severe limitation at low contaminant concentrations. This limitation restricts the purity achievable with pervaporation. One solution to overcome these limitations is to integrate pervaporation into a package of different processes to form a range of ‘hybrid processes’. <br/><br/>Aims<br/>Virtually every separation process can be combined with a pervaporation process to form a hybrid process as long as it is capable of achieving a predefined task under optimised processes conditions. In waste water treatment, pervaporation will be, generally, applied as a pre-treatment before a final polishing step due to its driving force limitations. In cases where membranes with an appropriate selectivity are available the permeate can be treated by liquid-liquid phase separation and the recovered organic compound can be recycled, see Figure 1. Otherwise, the concentrated, and therefore volumetric reduced, waste stream has to be treated by less favourite alternatives such as incineration. In both cases the retentate is further treated by a polishing process. In this study the potentials of the following processes as polishing step within a pervaporation-based hybrid process will be analysed:<br/>• Oxidation<br/>• Electro-Chemical Destruction<br/><br/>Furthermore, a special case of hybrid processes combining two pervaporation units, one with ‘high-selectivity/low flux’ membranes and the other with ‘low-selectivity/high flux’ membranes is presented.<br/><br/>Methods and Results<br/>The pervaporation unit is analysed using a simulation package developed at the University of Bath. In this simulation a ‘Finite Elements in Succession Method’ is applied to divide the membrane area of the pervaporation unit into small segments and to solve the mass, concentration and energy balance for each of these elements. In a parameter study the influence of different process parameters like e.g. temperatures, pressures and change over concentrations between the processes on the hybrid process will be discussed. The influence of different process parameters on the economics of the hybrid process is analysed in a sensitivity analysis using spreadsheet simulations. <br/><br/>Conclusion<br/>The different hybrid processes analysed have the potential to be integrated into waste treatment systems to meet future environmental targets. Design procedure taking techno-economic aspects into account have been established to provide case-specific solutions. <br/>}},
author = {{Lipnizki, Frank and Hausmanns, Stephan and Field, Robert W. and Ten, Po Kiong}},
keywords = {{Membranes; Pervaporation; Hybrid processes}},
language = {{eng}},
month = {{05}},
pages = {{298--298}},
title = {{Process designs for novel pervaporation-based hybrid-processes to recover organic compounds from waste water}},
year = {{1998}},
}