Brackish water contains more dissolved salts than freshwater but significantly less than seawater. It commonly occurs in coastal regions where groundwater is influenced by seawater or in transition zones between fresh and marine waters. Elevated salinity may affect taste, cause corrosion and impact certain industrial or agricultural applications.
Common Challenges
- Elevated Salinity
- High Conductivity
- Taste Issues
- Corrosion
- Impact on Irrigation and Processes
Common Treatment Methods
- Particle Filtration
- Fine Filtration
- Reverse Osmosis (RO)
- Activated Carbon (if required)
- UV Disinfection
Advantages
- Typically lower pressure than seawater RO
- Can provide excellent drinking water quality
- Well-established technology
Limitations
- Requires energy and pressure
- Produces a concentrate stream
- Pretreatment is often required
Example Treatment Trains
Brackish Water
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Particle Filtration
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Fine Filtration
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RO
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UV Disinfection
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Drinking Water
Brackish Water
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Sand Filtration
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Activated Carbon
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RO
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UV Disinfection
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Drinking Water
Brackish water is highly variable and does not always resemble seawater. Water composition can differ significantly between locations and seasons, making water analysis critical before selecting a treatment solution. In many cases, reverse osmosis is the most effective method for reducing salinity.