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COMMERCIAL RO SYSTEMS

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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.

Premium Quality RO Systems

Mark Controls RO Systems are Premium Quality machines which are designed, customised and manufactured under stringent conditions as per clients requirement without making any compromise on quality.

Control Panel - Fully automatic control is managed either through a local control panel or a PLC depending on customer requirements.

Microfilteration Protection

The RO membranes are protected by 5 micron cartridges contained in a 316 stainless steel housing.

Skid Mounted

Skid mounted for ease of transport and simple installation. Frames are corrosion resistant thanks to a galvanised painted steel construction.

High Effeciency Membranes

High Efficiency membranes are used with 98.5% salt rejection to ensure the highest quality water is produced.

High Pressure Pumps

High pressure Grundfos pumps in 316 stainless steel to ensure absolute reliability and corrosion resistance. No need of extra pump for flushing operations.

Standard Pipe work

Standard pipework is 316 stainless steel on high pressure side and pvc on low pressure side. All pipework is food grade standard.

Advanced Monitoring Technology

Digital flow meters and conductivity probes monitor all aspects of the operation.

Advantages of RO Systems

  • Substantial cost savings
  • Improved energy efficiency
  • Enhanced total system performance
  • Scale reduction
  • Superior taste and clarity
  • Spot-free rinses
  • Applications of RO Water

Applications of RO Water

  • Food & Beverage Production
  • Boiler and Cooling Tower Pre-treatment
  • Pretreatment for high-purity water systems
  • Bio-pharmaceutical Manufacturing
  • Water Jet Cutting
  • Steam Production & Humidification
  • Power Generation

How Reverse Osmosis Works

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.

What does Reverse Osmosis remove

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.

Pretreatment

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.

Vulnerabilities

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.

Common Mistakes Made With Reverse Osmosis Systems

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.

Early Warning SIgnals

The following should be seen as an early warning sign that something is not completely right with your RO plant. If you notice anything like this through routine monitoring or inspection, get on the phone to one of our engineers right away, before a serious issue occurs.

a) Reverse osmosis recovery rate is less than 70%:

For any well-designed RO system, 70% recovery of permeate should be the golden standard you should look for. Should it drop below this figure, it should be treated as a 'Canary in the cage' that some maintenance is required. It may be that your membranes need cleaning or replacing, or that you need to get someone in to have a look at the workings of your system.

b) Membranes are becoming clogged and/or scaled up:

Membranes should be regularly cleaned in order to prevent buildup of organic material or calcium deposits. However, they do also need to be periodically replaced. With a well-designed and operated unit you can realistically expect a three-year life span for your membranes before they should be monitored closely for signs they need replacing. A common (and costly) mistake some businesses make is to replace membranes when a simple cleaning would suffice to improve performance. The inclusion of a CIP rig in your reverse osmosis installation will help extend the active life of your membranes and save money in operating costs.

Ways to maintain Peak Performance RO Systems

There are a number of best practices you can adopt to help sustain your RO plant at peak efficiency.

Granular Activated Carbon (GAC) can be installed in an automatic backwashing unit for the removal of free chlorine and organic matter.

Install 5-micron absolute rated depth filters for particle and fouling index reduction.

Ensure you have adequately sized feed pumps and pipework installation.

Install a CIP (clean in place) and disinfection rig for periodic maintenance of the RO membranes.

Thin film composite (TFC) RO membranes will provide high flow and low energy consumption.

A constant softened feed water will help prevent RO membrane scaling