A High-Performing Stormwater Polisher
Purus Polishing is a collection of industrial stormwater treatment technologies designed to remove small particulates, colloidal solids, dissolved metals, nitrate, toxic organics and bacteria to low levels. Purus requires relatively clear inlet water with a TSS concentration of less than 20 mg/L. To achieve this level of clarity, Purus systems are most often used downstream of Aquip filtration or another high-performing particulate-reduction technology.
The Purus technologies can be applied individually or in a series to reduce most pollutants to below benchmarks or numeric action levels. With this level of stormwater pollutant removal possible, the Purus system is ideal for industries where higher concentrations of specific pollutants are unavoidable or where more stringent or watershed-specific water quality standards apply.
Purus Features
- Flow matched to upstream treatment rates
- Slip-stream treatment configuration available
- Freeze protection available
- Targets individual site-specific parameters
- Removes trace pollutants in hard to treat applications
Purus Basic is a pressurized fine filtration technology that shaves particulate pollutants down to a nominal particle size of 10 microns, 5 microns or even 1 micron. (There are 25,400 microns in an inch.) For pollutants that are present predominantly in ultrafine or colloidal particulate form, Purus Basic may be sufficient polishing technology to get the target pollutants to below benchmarks or action levels. It is critical that Purus Basic technology include pretreatment if the TSS concentration is consistently greater than 20 mg/L. (Aquip is an ideal upstream technology to Purus Basic.)
Purus Metals is a pressurized media filtration process that targets specific ionized or dissolved metals, or specific categories of metals. Purus Metals is typically used downstream of Purus Basic or in certain cases can be used downstream of Aquip. Typically metal is reduced through Purus Metals to below the benchmarks or action levels, with a margin of safety. StormwateRx engineers will work with your staff to identify the best media for your particular application and needs.
Purus Organics is a pressurized media filtration process that targets specific types of organic compounds including chemical oxygen demand (COD), biochemical oxygen demand (BOD), volatile organic compounds (VOCs), light hydrocarbons such as gasoline, as well as certain toxic organics such as PCBs and PAHs. Purus Organics will also remove metals that are attached to organic compounds. Purus Organics is typically used downstream of Purus Basic and upstream of Purus Metals. StormwateRx engineers will work with your staff to identify the best media for your particular application and needs.
Purus Bacteria is a non-chemical gravity flow disinfection technology that kills bacteria, viruses and protozoa through a physical process. Stormwater bacteria disinfected by Purus Bacteria include e.coli and fecal coliform. Populations are normally disinfected to well below the benchmarks or action levels.
Typically installed after Aquip stormwater filtration technology in a “treatment train” configuration, Purus Nitrate targets particulate and soluble nitrite and nitrate in stormwater. Purus Nitrate is ideal for industries where nitrogen compounds are used or where organic materials are processed such as the aerospace, fabricated metal products, galvanizing, rubber & plastics, petroleum refining, food processing, solid waste & recycling, and fertilizer manufacturing.
Purus Performance
How Purus Works
Project Profiles
HOT DIP GALVANIZER, WA
Washington galvanizing site meets stormwater benchmarks for zinc with innovative stormwater design, Aquip basic filtration and Purus metals polishing.
COAL FIRED POWER PLANT WV
US electricity generator uses StormwateRx process for hotspot industrial stormwater runoff from the site preventing pollutants from reaching the Ohio River.