EPA Presentation Link:
Loprest has a system to remove selenium, arsenic, mercury, nitrates and other heavy metal as required by Federal EPA regulation 423. This new legislation controls the contaminants in the discharge of many industrial clients, especially coal fired power plants.
Loprest Brochure: Radium Removal Brochure Download
SMI Technical Selenium Removal Article: SMI Article Download
EPA Link: EPA Regulation 423 Link
Selenium Removal Systems
Loprest Water Treatment Company is privately owned corporation that manufactures water and process purification systems for municipal, industrial, food and beverage processing and utility markets.
Loprest has systems to remove selenium in either potable water or waste water discharge applications. The Loprest system uses ion exchange resin or Sulfur Modified Iron (SMI) for the removal of selenium to the parts per trillion (ppt) level.
In ion exchange systems the selenium is oxidized to selenate and removed by strong base anion exchange resins. Regeneration of the resin with brine is required to make the systems economical. Further recycling and reuse of the brine spent brine often done in the process.
SMI-III is a reactive media that removes selenium via a chemical reaction and adsorption of the reacted selenium compounds into the media’s structure. Because SMI-III is a reactive media it has much higher capacities for selenium removal than other processes. Leakage levels are much lower as well. Pilot testing with SMI on Coal storage runoff water has shown incoming Se levels of > 20ppb can be reduced to <0.06ppb. These results are achieved even in high TDS waters after the suspended solids have been removed. For over 80 years Loprest has kept pace with water treatment and food and beverage needs as dictated by local. state and federal regulations. Every system is designed and manufactured in our facilities in Rodeo, CA.. Loprest continues to provide ongoing service and dependability to all its customers.
Standard Water Treatment Systems Designed And Fabricated By Loprest Include:
- Multi-Media Filters
- Iron & Manganese Removal Filters
- Granular Activated Carbon Filters
- Arsenic Removal
- Multi-Cell Pressure Filters
- MTBE Clean-Up
- Perchlorate and Nitrate Removal Systems
- Groundwater Clean-Up
- Air Stripping Towers
- Pressure Contact Clarifiers
- Dual Stage Pressure Filters
- Packaged Water and Wastewater Treatment Systems
- Filter Media Replacement