Sea Water Desalination by Reverse Osmosis (Ro)
System
Drinking water production in Singapore, capacity: 136,000 m³/day. GEMÜ supplied more than 760 valves in nominal sizes from DN 15 - DN 1400 for this project. To offer the customer a package solution, valves were also purchased from partner companies and GEMÜ supplied everything as a single source supplier.
Valves Used In the System
Sea Water Inlet, Filtration/Flotation, Supply (Tanks and Pump Stations)
- Butterfly valves DN 65 - DN 1400
- Disc materials 1.4408, bronze or ECTFE coated,
- Operating pressure depending on process area 2.5 - 18 bar.
- Pneumatic and motorized operators as well as manual operators with hand levers and gears
Water Pre-Treatment and Post Treatment, Dosing of FeCl3, H2SO4, HCl, NaOH
- Diaphragm valves DN 15 - DN 40
- Valve bodies PVC-U, PVDF
- Operating pressure approx. 3 - 5 bar
- All valves with pneumatic operators, fully automated.
- Variable area flowmeters DN 20 - DN 40 were also installed
Pump Stations in Front of the Osmosis Modules
- High pressure valves and non-return valves in DN 300
- Valves made of special materials e.g. Super Duplex A890
- Operating pressure 5 - 84 bar
- Differential pressure up to 59 bar
- All valves are pneumatically operated and equipped with intelligent positioners
Particle Filtration – Pre-Stage Water Treatment
System
Particle filtration for separating water from solid matter such as sand, mud, precipitation, iron, manganese, plant residues and very small living things or other suspended matter and particles. For water taken from rivers, lakes, wells or contaminated systems as well as for mechanical cleaning of waste water.
Valves Used In the System
- Diaphragm valves DN 15 - DN 300 for highly contaminated water
- Butterfly valves DN 65 - DN 600 for water with a low degree of contamination and large nominal sizes
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Valve material: PVC-U, PP, PA, steel, occasionally stainless steel Manual, pneumatic or motorized operators
Filter Monitoring
Pressure or differential pressure measuring instruments GEMÜ 3120 for operating pressures 0-10 bar
Cooling Circuit for Industrial Water
Production system for special microchips and test wafers for the electronics industry. All the facilities are hermetically separated from the outside world in order to prevent contamination in semi- conductor production. The cooling water must not cause contamination of the cooling installation and the cleanrooms. DI water is used as the heat transfer medium /coolant.
Valves Used In the System
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Butterfly valves DN 65 - DN 200
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Rilsan coated cast iron bodies (LUG),
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EPDM liner and stainless steel disc
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Manually gear operated; in the process control system the butterfly valves are equipped with a motorized operator
Treatment of Leachate from Rubbish Dumps
Treatment /detoxication of leachate from rubbish dumps. The pretreated raw water is treated in a three-stage reverse osmosis process to keep the filtration residues as low as possible. The system is PLC controlled and operates fully automatically under constant monitoring. If the limiting values are exceeded by scaling or fouling, the system is automatically turned off and cleaned by CIP equipment to reduce biofouling.
Valves in the normal pressure area of the system
Brackish Water Treatment and Boron Decontamination
System:
Sea water treatment in a region of the Eastern Mediterranean. The amount of drinking water to be treated daily is 6,500 cubic metres. The boron content in the raw water is available as boric acid at an amount of 1.0 - 2.5 mg/per litre. The boron content is reduced to less than 0.25 mg/per litre. The system includes various filtration stages, several ion exchangers with an additional stage for boron as well as a final reverse osmosis process.
Valves used in the system
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Diaphragm valves in polypropylene (PP), DN 25 - DN 100
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Diaphragm valves with PP-lined S.G. iron bodies,
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DN 25 - DN 100
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Pneumatic operators, fully automated
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GEMÜ 1435 EPos® positioners for control circuits mounted to diaphragm valves
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In the water inlet and outlet manually operated butterfly valves are used which are only rarely operated.
Sewage Clarification Plant, Water Activating Basin
System:
It is a domestic sewage cleaning with presettling basin, activating basin and final sedimentation basin. The compressed air for activation is generated in a compressor house and fed to the settling basin at 4 to 6 bar. At the border of the basin the collecting main opens into a manifold from where it discharges into the sewage along the basin. Under the surface the compressed air is distributed in the whole basin by nozzles.
Valves used in the system
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GEMÜ wafer type butterfly valves, DN 80 - DN 1000
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Valve body: cast iron, epoxy coated (400 µm), with stainless steel discs and LUG design DN 65 - DN 400, in sizes larger than DN 400 in double flange design, nitrile liner (NBR / Perbunan)
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Butterfly valves up to DN 125 are manually operated, the larger sizes are motorized
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GEMÜ plastic solenoid valves are used for dosing ferric chloride
Special Features
The sewage inlet and outlet is controlled by butterfly valves installed under water. Their gear is flooded and the motorized operator is mounted outside the basin.
Click Here to View Valves for Water Treatment Plant
