The amount of wastewater produced by municipalities and industry is substantial and, if left untreated, poses a significant threat to aquifers, rivers, lakes, and watersheds. Recycled wastewater and secondary effluent, on the other hand, are potential resources. These resources are especially needed where water is scarce from drought or high population density.
When you use the Pall Aria™ system to process wastewater and secondary effluent, the product is of such integrity that you can safely use it for agriculture and industry. This enables you to conserve the scarce fresh water for drinking or to reduce purchases from the municipal drinking water supply.
Secondary effluent recycling utilizes microfiltration with or without downstream reverse osmosis treatment. When a Pall Aria system is used, the effluent meets the US EPA’s National Pollutant Discharge Elimination System requirements for reducing Cryptosporidium and Giardia. Based on this criterion, the high-quality discharge can be used for irrigation, aquifer injection, recharging of watersheds, and industrial processes. In addition, secondary effluent can be treated for use as boiler feed water and cooling tower water.
In recent years, membranes have been used in conjunction with biological treatment, without a secondary clarification step. The Aqua MB Process couples Pall Corporation’s membrane technology with the biological treatment expertise of Aqua Aerobic Systems Inc. to deliver a cost-effective alternative to membrane bioreactor systems.
The Pall Aria system is ideally suited to this application since it is pressure-driven and uses membranes that are extremely robust and chemically resistant. If you’re installing a new wastewater treatment facility, it will be more efficient and have a smaller footprint, higher-quality effluent, and greater throughput. If you have an existing facility, you’ll benefit from greater throughput without altering the current footprint of the plant.
Water treatment at oil production wells
To maintain high output at production wells, water used for oil field injection is filtered through Septra™ elements. The filters strip suspended solids and oil from the water to protect the oil-bearing formation during enhanced recovery (water injection) operations.
Extending coolant life in metal working plants
To extend the useful life of coolants employed in metal-working applications such as rolling, grinding, etching, and machining, Septra filters installed on coolant recycle flows have reduced counts of particles 5 μm and larger to within manufacturing plant specifications.
Drill water treatment at refineries
Membrane technology is saving hundreds of thousands of dollars per year in the treatment of drill water at refineries. At one petroleum refinery, about two million gallons of nickel-laden water is generated per year. This water requires treatment to meet the refinery's National Pollutant Discharge Elimination System (NPDES) permit conditions. A Disc Tube™ system was installed to eliminate nickel from the effluent stream, producing condensate-quality permeate water that can be used as boiler feedwater. The nickel concentrate stream is recycled for use as drilling water.
Other wastewater applications
Process wastewater treatment and recycling:
- In chemical and polymer production
- In power generation
- In semiconductor manufacturing