Seawater Desalination pp 41-75 | Cite as
Membranes for Desalination
Abstract
This chapter provides a general overview of the fundamentals of membrane processes currently under operation in desalination plants, including Microfiltration (MF), Ultrafiltration (UF), Nanofiltration (NF), Reverse Osmosis (RO) and Electrodialysis (ED). The first part provides a description of the preparation techniques for porous, dense or thin film composite membranes made from polymeric materials, along with a technical comparison of the different membrane modules used in filtration processes. The basic transport phenomena relating to mass transfer for the different membrane separation units are also illustrated. In the second part, attention is focussed on analysis of the critical operational issues, with emphasis on fouling and related actions to prevent or control it by appropriate cleaning methods or suitable pretreatment (conventional or membrane-based).
Keywords
Reverse Osmosis Natural Organic Matter Feed Water Thin Film Composite Desalination PlantAbbreviations
- BOD
biochemical oxygen demand
- CA
cellulose acetate
- COD
chemical oxygen demand
- DIPS
diffusion-induced phase separation
- DMF
dual media filtration
- DOC
dissolved organic carbon
- DOM
dissolved organic matter
- ED
electrodialysis
- LSI
Langelier saturation index
- MCr
membrane crystallisation
- MD
membrane distillation
- MF
microfiltration
- MFI
modified fouling index
- MW
molecular weight
- NF
nanofiltration
- NOM
natural organic matter
- NTU
nephelometric turbidity units
- PA
polyamide
- PAN
polyacrylonitrile
- PCA
polycarbonate
- PES
polyethersulfone
- PET
polyethyleneterephtalate
- PI
polyimide
- PP
polypropylene
- PSU
polysulfone
- PTFE
polytetrafluoroethylene
- PVDF
polyvinylidenefluoride
- RO
reverse osmosis
- S&DSI
Stiff and Davis stability index
- SDI
Silt Density Index
- SHMP
sodiumhexametaphosphate
- SWM
spiral-wound modules
- SWRO
seawater reverse osmosis
- TDS
total dissolved solids
- TFC
thin film composite
- TIPS
temperature-induced phase separation technique
- TSS
total suspended solids
- UF
ultrafiltration
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