Fluidized Bed Reactor (FBR)

The Technology

The team at Envirogen has a long history of harnessing the science of microbiology to produce high-performance fluidized bed bioreactor systems engineered to eliminate even the most difficult chemicals from aqueous streams, providing high-quality, potentially recyclable water and potable water. In fact, we successfully installed an FBR system to provide potable water by treating perchlorate contaminated wells in Southern California. We have obtained the regulatory approvals to produce potable water with our FBR technology. Using non-pathogenic, naturally occurring bacteria, and nutrients to facilitate bacteria growth, the FBR delivers a green solution to address difficult contaminants.

Our Product

For a broad range of influent flow rates and contaminant concentration levels, our fluidized bed reactor (FBR) system is often the most economical treatment choice. With aerobic, anaerobic and anoxic designs available, systems have been successfully operated at ranges from 5 to 6,000 GPM, yielding high performance paired with low capital and operating costs.


Small footprint/Efficient – High concentration of biomass, plug-flow characteristics and tall beds minimize bioreactor footprint. High biomass concentration means long Solid Retention Time (SRT) and short Hydraulic Retention Time (HRT) and a high-quality effluent

Steady-state performance – FBRs run continuously without backwashing or cleaning operations.

Proven design – Envirogen’s FBRs have been improved and refined based on lessons learned over 30+ years of design and operating experiences.

Robust – Does not plug up or channel. Tolerant of high feed Total Suspended Solids (TSS) and metals. Proven robust performance and ability to quickly recover from upsets such as power outages or loss of chemical feeds. Capable of handling both hydraulic and organic shock loads

Flexible – Operates effectively over a wide range of feed flow and qualities. Actual treatment technology (“green”), not just a phase transfer treatment for most contaminants.

Cost effective – across a variety of contaminants treated


Whatever the problem – chemicals, aromatics, alcohols, ketones, chlorinated solvents, Polycyclic aromatic hydrocarbons (PAH), 1,4-Dioxane, chromium hydrocarbons, BTEX (Benzene, Toluene, Ethylbenzene and Xylene), selenium, perchlorates or nitrates – the FBR system handles high flows at low cost with typical treatment efficiencies of 99 percent or higher.

Additionally, this is one of the most efficient denitrification processes available today. Our FBR denitrification process lowers discharge levels of nitrogen in wastewater to less than 0.1 mg/l NO3-N. This simple end-of-pipe solution can use different carbon sources, does not require backwashing, produces minimal biosolids, and does not have filter upsets due to accumulating nitrogen bubbles.

Envirogen Experience