Brackish Water Treatment titel1

Reverse Osmosis Systems titel1



Brackish water is water that is more saline than fresh water, but not as much as seawater. It can come from mixing of seawater with fresh water, as in estuaries, or it may occur in brackish fossil aquifers.


Technically, brackish water contains between 0.5 to 30 grams of salt per litre. Brackish water covers a range of salinity regimes and is not considered a precisely defined condition. It is characteristic of many brackish surface waters that their salinity can vary considerably over space and/or time.

Reverse Osmosis systems can be used to remove both salts and organic materials from brackish water, enabling communities with limited fresh water to increase potable water for their inhabitants. Long lasting, highly efficient membranes reduce demineralization and desalination costs

For the preservation of the effectiveness and life span of a Reverse Osmosis (RO) installation, a sufficient pre-treatment is required. A proper selection of pre-treatment methods for feed water will improve affectivity and extend the life span of the system by preventing or minimizing biofouling, scaling and membrane plugging.

To perform an uninterrupted and reliable pre-treatment of the feed water a special approach is used. A pre-treatment that is not geared to the installation may cause a system overload. When this occurs the system parts need cleaning much more often to restore productivity and salt retention. Cleaning costs, system performance and standstill time are very significant in that situation.

BIODOS specializes in the field of brackish water treatment equipments in GERMANY. Our brackish water purifiers are ideal solution for regions, where there is extremely highly contaminated water with very high TDS levels (Upto 10 000 TDS) is available. Our brackish water purifiers use latest directive and most innovative nano filtration technology (reverse osmosis-membrane technology) to yield a crystal clear and potable drinking water as per international norms and standards.


RO is based on the process of osmosis. Osmosis involves the selective movement of water from one side of a membrane (a plastic film that looks similar to cellophane) to the other. To make the process work, pressure is applied to the contaminated water, forcing water through the membrane. Since contaminants do not move with the water as it moves across the membrane, purer water collects on the other side of the membrane. The purified water that accumulates on one side of the membrane can then be used or stored. A specific amount of pressure is necessary to separate purified water and contaminants.

The levels of most dissolved compounds and suspended matter present in water can be reduced by RO treatment. The efficiency with which membranes reject the contaminant molecules depends on the pollutant concentration and chemical properties of the pollutant. Membrane type and operating conditions will also affect the degree of pollutant removal.

Efficiency of removal is often described using the term "rejection percentage," which is the percent of a particular contaminant that doesn't cross the membrane, i.e., is rejected by the membrane. It is important to know not only rejection percentages, but also incoming pollutant concentrations to effectively reduce contaminant concentrations in the drinking water to safe levels. Basic components of an RO system should include a prefilter to remove fouling agents such as rust and lime; an RO module containing the membrane; an activated carbon postfilter to remove residual taste, odor and some compounds from the purified water; a storage tank; and various valves, including a shut-off valve that stops the water flow when the storage tank is full. The system must also provide for waste flow to drains. Prefilters containing activated carbon are commonly used to protect chlorine-sensitive membranes.

We design and manufacture the Reverse Osmosis Plants according to the need for tap water, brackish water & sea water application. The production range starts from 100 LPH (Liter per hour) to 100 M3 per hour from 400 TDS to 45,000 TDS.
  • Produce high-quality demineralised water
  • Most modern membrane technology
  • Modular design
  • Low water-rejection rate
  • Low operational and maintenance costs
Range of RO units utilises the most modern membrane technology and consists of a modular design.