MBBR, Filtration & Lagoons

Find Nexom at IFAT 2022 in Hall A3, Stand 315!

Find us in Hall A3

Planning to attend IFAT 2022 in Munich? RSVP to let us know you’re planning to stop by our booth!


Biological Technologies for Cleaner Water:

Filtration Technologies for Cleaner Water:

Intensify Your Ammonia, BOD, OR NITRATE REMOVAL

BioPorts MBBR treatment intensification offers:

  • More treatment capacity in a small footprint
  • The ability to handle variable loading
  • Media size optimized for huge surface area while allowing for more coarse screening
  • Operational simplicity

Reliable, simple, intense.

BioPorts MBBRs work based on a series of basic principles, offering them three key advantages:

BioPorts MBBRs are reliable.

When flows increase quickly, it can overwhelm an activated sludge system’s capacity and cause biological washout.

With BioPorts, your biology is fixed where you need it: in your treatment basin, fixed to the surface of BioPorts media which themselves are retained using coarse screens. No more biology washout.

BioPorts MBBRs are simple.

Balancing return activated sludge is a challenging part of managing an activated sludge plant, and although the improvements in oxygen transfer make it well worth it, managing membrane-based or, more challenging yet, fixed-pore fine-bubble aeration adds to an operator’s workload.

With BioPorts MBBR, you don’t need to return your activated sludge because, again, your active biology is fixed directly to the media retained in the basin using coarse screens. And because moving media both impedes the rise and breaks up the aeration bubbles, lower-maintenance membrane-free diffusers can be used while achieving the same oxygen transfer.

BioPorts MBBRs are intense.

When your facility was first designed, it probably wasn’t being asked to handle the high strength or variability as you’re seeing now, and that was when it was brand new!

Create and retain the density of treatment to better handle today (and tomorrows’s) loading levels and their fluctuations, all thanks to your BioPorts MBBR.

BioPorts Media 600-14 900-09
Outer diameter 18mm 17-20mm
Cylinder length 14mm 9mm
Biologically-active surface area 589m2m3 942m2m3
Material HDPE with carbon black added for UV protection
Specific gravity 0.96 0.96
Max fill capacity
  • Aerobic
67% 67%
  • Anoxic/anaerobic
50% 50%
Download the BioPorts 600 & 900 media spec sheet


Blue PRO reactive filtration is the simple, powerful tool for meeting ultra-low phosphorus (or metals) limits like North America’s lowest municipal limit at Citronelle (right). It uses a patented reactive filtration process within our CA Title 22 reuse-ready Centra-flo® continuous-backwash media filter while: 

  • Reducing plant chemical usage, 
  • Eliminating high-rate media backwashes, and 
  • Eliminating replacement/loss of media. 

Citronelle, Alabama meets North America’s lowest municipal phosphorus limit

A 0.1 mg/L limit has historically been considered an ultra-low target. But in Citronelle, they faced an even steeper challenge from regulators with a new ultra-low phosphorus target of <0.02 mg/L, which is among the lowest requirements in North America. 

In collaboration with the engineer, Nexom created an upgraded system for Citronelle by adding Blue PRO® reactive filtration for enhanced treatment efficiency and cost minimization. The reactive filtration phosphorus compliance upgrade was sized for a peak daily flow of 0.76 MGD, and its implementation has allowed the WWTP to meet its discharge permit cost effectively. 

Download a printable version of the Citronelle, AL Blue PRO case study:


Creating the perfect environment for nitrification

Using the patented Step-Feed process, the SAGR overcomes each of the four factors that would otherwise prevent nitrification: 

  1. Oxygen: The stone bed is fully aerated, meaning there is plenty of dissolved oxygen for the nitrifying bacteria even in the dead of winter. 
  2. Surface area: The clean stone is sized to optimize hydraulic conductivity as well provide ample surface area for the nitrifying bacteria to grow on. 
  3. Competition from cBOD: SAGR beds are sized to provide cBOD polishing in addition to nitrification. 
  4. Cold water temperatures: Because nitrifying bacteria grows much more slowly in cold water, the SAGR process prebuilds and stores nitrifying bacteria while the water is warm so that it is already in place once metabolism and reproduction slow in cold water, setting it apart from other attached growth nitrifying technologies. 


  1. HDPE linerprevents infiltration while sacrificial walls help the SAGR maintain its shape during construction. 
  2. Influent distribution chamberensures influent is spread across the width of the bed. 
  3. Clean stone provides surface area for bacteria while preventing temperature shock. Mulch-covered for insulation. 
  4. Linear aeration covers the base for fully-aerobic conditions. 
  5. Effluent collection chamber is gravity fed to minimize O&M. 

SAGR Cold Weather Nitrification Cut Sheet



with competitive pricing and quick turnaround!

Diffuser Express is your source for quality aftermarket aeration parts.

Whether you are shopping for a full system upgrade or a few membrane replacements, Diffuser Express is here to help get you back up and running quickly. 

Start your aftermarket parts order, right here and now: