Nowadays, Sea Water Desalination has become a very affordable solution to cope with freshwater shortage typically in tropical as well as of off-shore areas. The desalination core process is based on Reverse Osmosis Membrane technology.
The pretreatment includes all the necessary treatment step ahead of the reverse osmosis plant.
It is determining the plant's lifetime and to minimize chemical cleaning and membrane replacement.
It has a direct impact on the plant performance.
There are as many membrane types as applications. They range from "high rejection" to "ultra-low energy" or "high boron rejection".
The reverse osmosis process can also be built with one or two passes, depending on the product water requirements and the seawater salinity and temperature. In most cases, 1 pass is sufficient to reach the USA/EU drinking water standards, especially regarding the boron content (1 mg/L). To reach WHO boron guideline (0.5mg/L), a second pass might be necessary (Boron removal process)
The energy recoverydevice is the key factor that determines the plant electrical costs. It must be chosen carefully based on the local energy costs and environment policies.
Post-treatment and /or polishing steps are required to condition the water after the reverse osmosis membrane process to make it suitable for your application.
Brine disposalcan be an environmental and economic issue in some areas where the fauna and flora are sensitive to local seawater salinity increase. Brine disposal should be studied and engineered case by case.
The art of desalination is to determine and combine available technologies to optimize water production costs and quality. To adapt our Desalination Plants to your local needs, we offer even containerizedmobile units from Intake to Distribution up to a production capacity of 100 m3/h of desalinated water (modular system).
All type of water can be produced from a desalination plant:
- WHO or EU drinking water
- Irrigation water
- Process water: boiler feed water, cooling water
- Demineralization or Ultrapure water
All type of natural seawater source can be treated:
- Shallow Surface seawater
- Deep seawater
- Brackish river water
- Beach well seawater
All essential process steps in desalination plants: