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Pretreatment for Reverse Osmosis

ZeeWeed ultrafiltration membranes are the preferred pretreatment choice for reverse osmosis systems. They produce a reliable, superior quality feed water that ensures stable, long-term reverse osmosis performance - even if the quality of the raw water changes.

Compare that to conventional pretreatment systems that are typically complex, use large quantities of chemicals, and produce highly variable water quality. ZeeWeed systems are compact, highly automated, simple to maintain and use significantly fewer chemicals.

Silt Density Index

Typical Treated Water Results

  • Turbidity < 0.1 NTU
  • Bacteria > 4 log removal
  • Giardia Cysts > 4 log removal
  • Cryptosporidium Oocysts > 4 log removal
  • Virus Rejection - ZeeWeed 1000 > 4 log
  • Virus Rejection - ZeeWeed 500 > 2.5 log
  • SDI < 2

ZeeWeed Pretreatment Features & Benefits

  • Supplies high quality feed water to RO system regardless of raw water turbidity
    Ensures the RO system continuously operates at peak performance
  • Extends the life of the RO membranes
    Reduces maintenance and replacement frequency
  • Increases the efficiency of the RO membranes
    Minimizes RO system size and reduces capital construction costs due to higher RO flux
  • Lowers chemical requirements
    Pretreatment and cleaning chemical usage can be dramatically reduced
  • Modular design enables simple and efficient sand filter retrofits
    Lower capital costs by reusing existing infrastructure

Featured Articles

» UF Membranes for RO Pretreatment - The Ideal Partnership
Long life and efficient operation of reverse osmosis (RO) membranes largely depends on the quality of the feedwater that a pretreatment system can provide. Whether RO membranes are desalting seawater, producing ultrapure water for industrial processes, or removing impurities from drinking water, pretreatment systems must provide a consistent supply of high quality feedwater to ensure trouble-free RO operation.

» Chinese Power Plant Chooses UF Membranes for Seawater RO Pretreatment
Recent industrial and urban growth in China has led to an explosive increase in energy demand. While this is good news for the country's power producers, a continual decline in freshwater supply has put undue pressure on the industry. ZENON ZeeWeed immersed ultrafiltration (UF) membranes will be used in the Yuhuan Power Plant, opening in 2007.

Feature Profiles
Bedok NEWater Factory
Bedok NEWater Factory

Water reclamation allows communities to reuse a portion of wastewater effluent, thereby reducing the amount of potable water consumed for non-potable applications. The Public Utilities Board (PUB), the sole water authority of Singapore, commissioned the Bedok NEWater factory, with the end product to be used as influent for industrial applications. The Bedok plant is among the first of four reuse plants initiated by the PUB.

» Read more...
IWVA Water Treatment Plant
IWVA Water Treatment Plant

Seawater infiltration makes drinking water production difficult in the costal area of Belgium. To combat this problem, The Belgian Intermunicipal Water Company of the Veurne Region (IWVA) wanted to design a plant that could produce water suitable for aquifer recharge.

Surface water is typically used to recharge the aquifers, but since these water sources tend to experience reduced flows during the summer months, an alternate supply of continuous high quality water was required to protect the aquifers from seawater infiltration and to reduce demand on potable surface water.

» Read more...