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Turning sea water (salt water) or salt containing fresh water (brackish water) into fresh drinking water is desirable only when there are no other sources available. Membrane separation (RO) or thermal distillation are possible but costly and complex.
A short summary about the technology behind our sea water solutions.
The type of water extraction is particularly important. Our preferred method, which guarantees sterilization, is to extract downstream, pre-filter the sea water by running it through rocks and with an appropriate well depth of >50 meters.
There are basically only two methods that can be used in this step: using gravel filters or an ultrafiltration (UF). Since surface water contains many microorganisms, water sterilization is needed. Most manufacturers use UF, which necessitates use of chemical additives and more elaborate technology.
This step requires usage of candle filters < 5µ as well as, antiscalants to soften the water.
Feed water is forced through a RO membrane with remaining salt particles removed. Apart from the membrane durability, other factors, such as the energy consumption and feedwater characteristics impact system quality and performance.
Considering that feedwater was treated with antiscalants, an adjustment of permeate pH levels, as well as, remineralization or addition of depleted minerals (filtered out together with salt particles) is required.
Minimal space requirement
Chemically enhanced backwash
High maintenance requirement
Easy to operate (backwashing)
Large space requirement
Retention up to 80 µm only