energy-efficient industrial and commercial Reverse Osmosis water desalination
Our energy-efficient Reverse Osmosis water desalination systems deliver the maximum treated water-flow with the minimum power consumption.
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Our energy-efficient Reverse Osmosis water desalination systems deliver the maximum treated water-flow with the minimum power consumption.
Salinity in water is the sum of all the disolved ions. The presence of these ions is the result of the dissolution of different salts (not just NaCl or common salt) while water is in contact with different types of mineral soil. This way, the terrain's geological features have a determining effect on the chemical composition of the water that circulates in it.
Water desalination consists in the removal of such dissolved salts.
A commonly used method to evaluate the salinity or total amount of dissolved minerals in water is the concentration of total dissolved solids (TDS). This parameter is the sum of all dissolved ions such as sodium, potassium, bromide, boron, calcium, magnesium, chloride, sulfate, bicarbonate, nitrate, metals, etc. TDS or salinity are usually expressed as mg/L or parts per million (ppm).
Typical salinity levels for water found in oceans, lakes and rivers are:
Watercore engineers have collaborated with industry leaders to design our SMART series of energy-efficient reverse osmosis water desalination systems.
The main benefit of these SMART energy-efficient reverse osmosis water desalination units is that, with a powerful PLC control, electronic pressure, flow and conductivity sensors and motorised valves are constantly optimising the operational settings to deliver the maximum treated water-flow with the minimum power consumption.
This game-changing technology is applicable to multiple industries such as irrigation or waste-water treatment and was conceived focusing on optimised energy costs and high water recovery.
Our RO desalination units are also equipped with an industrial MODBUS communication bus for integration in complex industrial environments, can be easily controlled locally or remotely by means of a powerful HMI interface and can be programmed to send alarms and notifications by email.
Dry contacts are provided for pretreatment units or storage tanks. When needed they can can also be controlled remotely with a TCP/IP interface and can be easily programmed to send alarms and notifications by email.
In order to achieve high recovery rates for our brackish reverse osmosis plants, we use three-stage configurations for large systems or concentrate recirculation for smaller systems and pilot units. This way we can reach up to an 80% overall recovery rate while each membrane still works under its standard 10% recovery rate. Recirculation allows membranes in small units simulate concentration conditions applicable to the final element in an industrial installation with low scale hydraulics.
| Standard Technical Data *(1) | BRO-15 | BRO-20 | BRO-25 | BRO-35 | BRO-50 | BRO-120 | BRO-250 | BRO-500 |
|---|---|---|---|---|---|---|---|---|
Permeate flow (m3/d) | 15 | 20 | 25 | 35 | 50 | 120 | 250 | 500 |
Feed TDS | < 6000 ppm | |||||||
Feed pressure | 2 bar (min) – 4 bar (max) | |||||||
Permeate TDS | < 200 ppm (screen-selected by user for irrigation units) | |||||||
Recovery | 65% – 80% | |||||||
Rejection | 97% – 99% | |||||||
Recirculation flow | Yes | |||||||
Membrane Type | Low Energy – 4″ | Low Energy – 8″ | ||||||
Array | 1/1/1 | 1/1/1/1 | 1/1/1/1/1 | 2/2/2/2 | 2/2/2/2/2 | 1/1 | 1/1 | 2/2 |
Hydraulic connections Feed | 1″ 3/4″ 3/4″ | 1″ 3/4″ 3/4″ | 1″ 3/4″ 3/4″ | 1″ 1″ 3/4″ | 1″ 1″ 3/4″ | 1 1/2″ 1 1/2″ 1″ | 2″ 2″ 1″ | 3″ 3″ 2″ |
Dimensions Width | 1400 mm 650 mm 1800mm | 2400 mm 650 mm 1800mm | 1400 mm 1000 mm 1800mm | |||||
Power (KW) | 2,2 | 7,5 | 15 | 30 | ||||
Power supply | 50Hz, 230V (1-Phase) or 400V (3-Phases) | 50Hz, 400V (3-Phases) | ||||||
| Qualified Feed Water Quality*(2) | |
|---|---|
Total dissolved solids (TDS) | < 6000 ppm |
PH value | 2-11 |
Iron | < 0.05 ppm |
Aluminium | < 0.05 ppm |
Manganese | < 0.05 ppm |
Free Chlorine | 0 ppm |
Oil and grease | 0 ppm |
Turbidity | < 1 NTU |
(TOC) Total Organic Carbon | < 2 ppm |
*(2) higher values of any of these parameters will require a pre-treatment. Contact us for a personalised solutions | |
| Features & Options | Standard | Option |
|---|---|---|
5 & 1 micron cartridge filters | Standard | |
High pressure pump | Standard | |
Low pressure pump | Optional | |
Stainless Steel 316 piping | Standard | |
Auto-flushing | Standard | |
Antiscalant dosing system | Standard | |
Chlorine Sterlization (pretreatment) | Optional | |
Iron, Aluminium, Manganese removal (pretreatment) | Optional | |
Turbidity removal (pretreatment) | Optional | |
Skid mounted | Standard | |
Containerised | Optional | |
VFD for high pressure pump | Optional |
Reverse Osmosis (RO) is a pressure-driven membrane separation technique used to separate dissolved solids from solutions. Semipermeable membranes allow water and some dissolved solids to pass through, retaining the majority of dissolved solids.
Rejection is defined as the degree to which dissolved solids are retained by the membrane. It is expressed in terms of percent of feed concentration and typical values for RO membranes are 98% or 99%. That means that 98% to 99% of dissolved solids are retained by the membrane.
The higher the concentration of dissolved solids, the greater the osmotic pressure of the solution and the driving pressure required to force the water flow inside the membrane in the reverse osmotic direction. As a consequence, typical working pressures for low salinity waters are 10-20 Bar, while typical working pressures for seawater RO are > 50 Bar.
Water salinity comes as a combination of concentrations of all the dissolved ions present in water. It is also called TDS (Total Dissolved Solids).
Measuring salinity or TDS involves collection and evaporation of a discrete water sample at 105°C followed by weighing of the solids remaining after evaporation. At the same time salinity is a critical value that requires continuos monitoring for many water treatment process and in particular for reverse osmosis.
Therefore, in practice, TDS concentration is often monitored continuously by measuring the electrical conductivity (EC) which reflects the water’s ability to conduct electricity. Conductivity is expressed in microsiemens per centimetre (μS/cm) or decisiemens per metre (dS/m).
The ratio between TDS and EC in water depends on the type of dissolved ions and the temperature and usually varies between 0.67 and 0.70.
No, reverse osmosis cannot remove dissolved gases in water. In fact that is the reason why reverse osmosis permeate is sometimes acidic, as dissolved CO2 in the feed water permeates as product and dissociates into carbonic acid.
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