Using the latest High Effeciency membrane technology coupled withrobust and proven designs , Mark Controls provide you with a complete range of RO systems of all capacities ranging from 250 LPH to 50,000 LPH.
Reverse osmosis is an increasingly popular solution in water purification. In many cases it has replaced conventional chemical deionisers. RO is popular because it removes the requirement to hold aggressive regeneration chemicals at the clients premises. It also does not produce a chemical effluent discharge. To many industries the security of an RO membrane is attractive as is the ability to readily validate the performance of the membrane.
Our Reverse Osmosis systems are some of the best on the market and operate at a reliable 70% efficiency with low energy membranes. So in other words, for every 100ml of impure water you put through the system, you get 70ml of pure water to service.
You may find some companies promising you 80% efficiency, but you should be careful of these, as it simply means that their systems force the membranes to work harder. The result is that the membranes do not last as long and need to be replaced more frequently, thus reducing the overall cost effectiveness of the system. You should also be very careful of cheaply marketed Reverse Osmosis systems, as not all RO processes are created equal.
The osmosis process is a naturally-occurring phenomenon where less concentrated saline solution tends to migrate to a more concentrated solution. Osmosis occurs everywhere in nature, from our kidneys absorbing water from our blood, to plant roots absorbing water.
A semi-permeable membrane, usually made of thin film polyamide is used to clean water which is pumped past its input side under pressure of up to 15 bar and up to 220 psi in a cross-flow direction. From 15 to 70% of the water that passes through the membrane will do so as permeate, while the remainder leaves the membrane as a concentrate containing 99% + of the feed water TDS.
In general terms when used as a standalone filtration method reverse osmosis has the ability to remove an extremely high percentage of a vast spectrum of contaminants including Calcium, Magnesium, Nitrates, Lead and Sodium as well as bacteria and viruses such as Cryptosporidium, E. coli and Norovirus, in fact any particle larger than a water molecule won't have the ability to pass through an ro system.
For industrial applications and dependent on your water quality requirements reverse osmosis can be used in conjunction with additional filtration methods such as a water softeners or carbon filters to continuously deliver filtered water to any specific level of quality.
However, Reverse Osmosis does not work on its own. The purification process is only as good as the pre-treatment to the water that is feeding it. There are certain contaminants that will damage Reverse Osmosis, including free chlorine, calcium and magnesium.
So you have to pretreat the freed water with activated carbon to remove the free chlorine and then a water softener to strip out the calcium and magnesium, before it can be put through the RO system.
If you fail to do this, then the free chlorine in the water will degrade the membrane and let organic contaminants through, and the calcium and magnesium will scale the membrane up, reducing its efficiency and working life.
This is the reason many industries consider Reverse Osmosis to be wasteful, time consuming and expensive. The conventional alternative is deionisation.
All RO systems depend on good pre treatment to the feed water. This is achieved by the use of Organic Scavengers, Activated carbon media and base exchange Water Softeners. It is true to say that excellent pre treatment is a requirement for long, reliable and efficient Reverse Osmosis operation. Reverse Osmosis membranes will not tolerate any form of hydraulic shock. It is important that RO is installed in a carefully designed purified water system with all of the necessary safeguards and monitoring. This is where an ongoing partnership with the experts at Wychwood Water Systems will pay dividends.
Chemical attack happens when a membrane comes into contact with an oxidiser like chlorine, which will burn the membrane and effect performance. Activated carbon is a pre requisite for this purpose.
A Reverse Osmosis plant only works properly if three factors are taken into consideration:
a) Correct professional installation
b) Thorough pre-treatment of water to remove inorganic and chemical contaminants
c) Regular maintenance of the plant, including cleaning of membranes and replacement where necessary.
It goes without saying, therefore, that mistakes arise to the extent that these three factors are neglected or ignored. Problems arise in reverse osmosis systems in cases where the plant has been poorly designed or installed incorrectly or Input water has been insufficiently treated to remove chlorine, calcium and magnesium or membranes are not regularly cleaned or replaced, or the plant pumps are not sufficiently maintained.