Desalination from Pump Engineers

Product/Service Name

Pump Engineers offering Energy recovery devices and pumps for desalination and Brackish Water Reverse Osmosis Desalination.

Pump Engineering Inc Energy recovery turbochargers and high pressure feed pumps for desalination

Sea Water Reverse Osmosis Desalination

• Turbochargers can be used in single stage SWRO plants to reduce high pressure pump discharge pressure or in two stage plants (Brine Conversion) as an interstage pressure booster.

Brackish Water Reverse Osmosis Desalination 

• PEI LPT Turbocharger is the only energy recovery device specifically designed for low pressure BWRO service.
• It is used primarily as an interstage pressure booster in two stage system.
• The LPT has provided dozens of municipal drinking water plants the best possible energy rate plus the advantages of flux balancing and reduced membrane fouling. It is the only practical energy recovery for BWRO plants.

Feed Pumps 

• The Advanced Variable Speed pump, or AVS, is a high speed single stage end suction pump designed for continuous service in high pressure applications such as seawater and brackish water reverse osmosis and boiler feed service.
• Like the AT and HALO Turbochargers, the AVS pump has a custom designed pump impeller and hydraulic flow passage.

Fybroc Non-Metallic Process Pumps

• FRP has been the material of choice for horizontal and vertical pumps performing various functions throughout RO plants.
• Specifically:
• Seawater intake
• Filter feed
• Intermediate booster or raw water transfer
• Filter backwash
• Cleaning recirculation
• Flushing
• Permeate water pumps
• Neutralisation pumps

Statiflo Static Mixers
Where static mixers are required in desalination plants:

Pre Desalination:

• At the inlet to the Desalination works chlorine is dosed to prevent seaweed and shellfish growth
• Upstream of the DAF or gravity filters, sea water is then treated using dosed sulphuric acid for pH Correction to about 6.8 and dosed ferric chloride for coagulation

During Desalination Treatment:

• Before the first pass dosed sodium bisulphite needs to be thoroughly mixed to prevent concentrated chlorine entering and damaging the delicate membranes
• Next an antiscalant is mixed to prevent the precipitation of salts and scaling of the membranes
• Further dosed ferric chloride for coagulation
• Caustic soda for further pH control may be required as RO permeate is slightly acidic

Post Treatment:

• CO2 gas for re-carbonating of the permeate water
• Lime water for pH control and for re-mineralizing of the permeate water.
• Sodium Fluorosilicate is dosed prior to supply for improvement of dental health

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