Commercial Reverse Osmosis Systems

Commercial Reverse OsmosisCommercial Reverse Osmosis water purifier with Sediment reduction, Carbon and Water Softener pre- treatment units

Commercial Reverse Osmosis water purifier with Sediment reduction, Carbon and Water Softener pre- treatment units.

Sue Kelly Water Systems Ltd is one of NZ’s most experienced suppliers of pre-engineered and custom built reverse osmosis systems for the treatment of residential, commercial and industrial water supplies.

For very high quality water for a complete household, for cleaning and rinsing procedures or product manufacturing, Reverse Osmosis water purifiers are recognized by many companies, internationally, to provide long-term savings in improved water quality entering their equipment and processes.

What is Reverse Osmosis (RO)

All water contains Total Dissolved Solids (TDS). TDS is the measurement by weight of the dissolved materials in a given volume of water. If a material will completely dissolve and is not visible in the water, it is part of the TDS of the water.

Reverse Osmosis helps to lower the TDS content of water, by passing it through a semi-permeable membrane with a pore size of less than 0.0005 microns in diameter. The purified (permeate) water produced by a Reverse Osmosis system is amongst the purest form of treated water available.

Reverse Osmosis can be effectively used for the reduction of Total Dissolved Solids in groundwater, surface water and sea water applications – desalination.

Desalination is the process of reducing the salt content in sea water to render it usable for domestic and commercial use

How Reverse Osmosis Works

Commercial Reverse Osmosis SystemsReverse Osmosis is a membrane process that acts as a molecular filter to remove over 99% of all dissolved minerals. Water passes through the membrane while the dissolved and particulate matter is left behind.

As pressure is applied to the concentrated solution, the flow is reversed and water is passed through the membrane from the concentrated side to the dilute side.

Water molecules penetrate the thin layer of the membrane and diffuse through it molecule by molecule. Dissolved salt ions would also diffuse through this layer, except that the solubility of the salt ions in the feed is much less than that of the water. This results in water passing through the membrane more rapidly than salts, causing separation.

The driving force of the reverse osmosis process is driven by both the feed water pressure and the concentration differentials across the membrane surface. For water, the pressure effect is the most important, and for the dissolved ions in the water, the concentration difference is the most important. Therefore, increases in pressure increase the amount of treated water without causing a corresponding increase in waste flow.

The RO process removes most of the dissolved mineral salts, almost all of the particulate matter and most of the dissolved organic compounds.

Reverse Osmosis Applications

Drinking Water-Reduces scaling; improves taste and clarity. Removes excess dissolved salts including Nitrates in ground water, cysts and bacteria.

  • Food & Beverage – Superior taste to be enjoyed by the clients & increased cost savings by the producer
  • Ice Production-Reduces scaling to reduce production costs and improves taste and clarity.
  • Laboratories, Pharmaceutical and Photographic applications.
  • Toiletries, Cosmetics, Shampoo and Cleaning products are all improved.
  • Humidification-Reduces scaling and dusting.
  • Grocery Stores-Prevents scaling in vegetable misters.
  • Pretreatment-For use in deionisation systems.
  • Boilers and Autoclaves -Improves energy efficiency.
  • Vehicle Wash-Provides spot-free rinses.
  • Water Jet Cutting-Improves operating efficiency; extends orifice life.

Contaminants Removed By Reverse Osmosis

Reverse Osmosis systems remove substantial amounts of most dissolved minerals (such as salts, metals and other minerals). Most bacteria and other microbiological contaminants are also removed due to their size in relation to the size of a membrane pore. Any particulate matter remaining after pre-treatment will also be removed, although RO is not recommended as a filtration process.

The following commonly found minerals are actively reduced by Reverse Osmosis:

Cat ions Anions
Calcium Carbonate
Magnesium Bicarbonate
Sodium Sulphates
Potassium Chlorides
Ammonium Fluoride
Barium Nitrates
Strontium Boron

Reverse Osmosis Specifications

SKWSL present a broad range of Reverse Osmosis systems for almost any application. Specifications can be provided from our pre-engineered equipment range. For information on larger Reverse Osmosis systems or on our Seawater Desalinates, please contact us.

Productivity will vary depending on the feed water conditions.

Reverse osmosis System technical parameters:

Inlet Pressure 200-400 kPa
Operating Pressure 600-1200 kPa
Power 220VAC or 380 V 3-phase
Operating Temperature 1-38°C
Maximum Turbidity 1 NTU
pH range 3-11
Maximum feed chlorine 0 ppm
Maximum feed TDS 1000 ppm
Maximum iron in feed 0.1 ppm

Reverse Osmosis – Standard Features

  • Low pressure switch – protects the pump during low pressure operation.
  • Connection for liquid level controls – allows for simple integration and operation.
  • Electrical control panel – all controls housed in an IP55 steel enclosure.
  • Free standing frame – durable, compact epoxy coated steel frame. No mounting necessary.
  • TDS indicator – monitor the purity of the treated water.
  • Accurate flow measurement and system control.
  • Recycle valve – reduce waste and increase system recoveries.
  • Pre-filter – 1-micron cartridge filter for particulate matter removal.
  • RO feed pump – multistage centrifugal feed pump.
  • RO membranes – Highest quality membrane elements incorporated.
  • Pressure gauges – allows for accurate measurement of system performance.

Reverse Osmosis Pre-treatment

On all pre-engineered RO systems, SKWSL offers pre-treatment equipment as indicated by a current water analysis. The pre-treatment plant can be mounted on the stainless steel frame with the RO unit or be free standing, and consists of the following components:

  • Sediment reduction filter-removes suspended solids and turbidity to between 3 and 5 micron
  • Activated carbon filter – removes chlorine, tastes, odours and organic colour.
  • Water softener – reduces feed water hardness to protect RO membranes from fouling.
  • System feed pump.

In addition to the pre-treatment system, SKWSL can add the following pre-treatment and post treatment items to all reverse osmosis systems in the pre-engineered equipment range:

  • UV sterilizer.
  • Chlorine dosing system.
  • Anti-scalant dosing system.
  • pH control system.
  • Ultra filtration pre-treatment unit for high turbidity feed water supplies.
  • Cleaning in place system.

Reverse Osmosis Design Considerations

To accurately size a reverse osmosis system for commercial or industrial applications, the following should be taken into consideration:

  • The amount of water you expect to use per 24-hour period.
  • Your peak water demand.
  • Operating hours per day.
  • Your in-coming water pressure.
  • The quality of your water – as determined by water analysis.
  • What you plan to use the purified water for.
  • Your site layout.

We can help you calculate your purified water needs, and can arrange for a professional water analysis to be taken and processed by an international recognised and accredited laboratory. For more information about reverse osmosis water purifying systems and how the RO process can help you in your home or business, contact us today.

For your New Zealand water purification, contact us today.

“New Zealand water purification from Sue Kelly, the New Zealand water specialists.”