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Sergio Pino-Jelcic
Senior Technical Sales Manager

The BioMag® System for Increased Performance and Capacity in Existing Footprint

Ballasted activated sludge dramatically increases biological treatment capacity and helps meet ENR limits
The innovative BioMag®​ system​ uses magnetite -- fully inert iron ore particles -- to enhance the clarification process. The system uses the world's fastest proven settling clarification technology for biological floc -- allowing capacity expansion and performance improvement with minimal plant modifications at the lowest cost possible. In fact, it consistently achieves a sludge volume index (SVI) of less than 50!

The BioMag system is primarily used to improve secondary wastewater treatment. It allows operators to control the sludge blanket, achieve high contaminant removal, and manage loads and flows.

Wastewater treatment facilities upgrade with the BioMag system to reduce the cost of complying with stringent new nutrient removal limits. In fact, Washington County, Maryland, recently decided to upgrade three of its facilities with the BioMag system.

To learn more about the BioMag system in Maryland, visit:

Visit Our Richardson, Texas, Pilot: Now Through Dec. 15: ​The North Texas Municipal Water District's Floyd Branch WWTP is piloting the BioMag system to achieve a 50 percent capacity expansion. Contact Technical Sales Manager Nathan Antonneau​ to schedule a tour.



  • Enable capacity increases up to 300% without new tankage
  • Manage wet weather flows without bypassing the biological process
  • Free up existing tankage to meet tougher ENR standards
  • Manage high organic industrial waste
  • Enable the conversion of single-stage bioreactors to higher performing multistage systems
  • Find a cost effective alternative to MBR, MBBR, IFAS technologies and conventional clarifier expansion solutions


  • Easy to incorporate in virtually any type of activated sludge treatment…biological process operation remains unchanged
  • BioMag equipment is located in sidestream location (WAS stream) without impacting main liquid stream in the WWTP
  • Magnetite is readily available (iron ore commodity), fully inert, non-abrasive (particle size is 10-15 microns), and magnetically retrievable (high recovery rates).
  • BioMag equipment is easy/simple to operate. The key peice of operating equipment has been successfully applied for dec​ades in other industries.
  • Evoqua has two mobile units that can help in challenging staged constructions, or temporarily alleviate issues related to poor settling sludge
  • Fully automated

 key benefits

  • Simplicity and reliability - Ballasting biological floc with magnetite dramatically increases secondary settling rates eliminating bottlenecks to process greater loads, flows or both.
  • Up to triple the capacity - Rapid and reliable settling enables a 2 – 3x increase in MLSS concentrations without the risk of upset, and an equivalent increase in treatment capacity — all within existing bioreactors and clarifiers.
  • Low-cost ENR - Increased capacity and superior solids removal enable existing activated sludge systems to free up reactor capacity for multi-stage treatment processes, thereby enabling the removal of TN to ≤ 3.0 mg/L and TP to ≤ 0.2 mg/L without tertiary filters.
  • Lower life-cycle costs - The BioMag System continuously recovers and reuses up to 95% of the injected magnetite offering a cost-effective, sustainable process.
  • Dedication and experience—Evoqua has 40 years of experience in biological processes, offering a holistic view when upgrading a plant, and maximizing synergies between BioMag and secondary treatment equipment.

 Video: See the BioMag System in action


The enhanced settling capabilities of the BioMag System has been proven at municipal and industrial facilities to deliver the following results:

BOD5 < 5.0 mg/L
TSS < 10 mg/L
NH3-N < 0.2 mg/L
TP < 0.2 mg/L without filters
TN < 3.0 mg/L without filters
SVI < 50 mL/gram
Clarifier SLR up to 100 lb/day-ft2
Clarifier SOR up to 2,500 gpd/ft2
MLSS up to 10,000 mg/L
MLVSS up to 8,000 mg/L The BioMag® System for Increased Performance and Capacity in Existing Footprint