Z-MBBR

Z-MBBR

Adding a new dimension to biofilm technology

Z is a family of carriers that enables biofilm thickness control. Traditional MBBR designs focus on the area available for biofilm growth. Z, offers a new dimension: controlling biofilm thickness.

Together with AnoxK™Z-200 and AnoxK™Z-400 carriers, we now provide MBBRs where biofilm thickness remains below a pre-defined height of 200 and 400 µm, respectively. This facilitates engineered and controlled biofilms targeting challenging applications and/or processes where high stability and top performance are a priority.

The Z-carrier maintains biofilm thickness below a predefined grid height, where the carriers clean themselves in the process through constantly carrier scouring the MBBR reactor.

 

Biofilm control

Depending on the type of wastewater and operating conditions, MBBR carriers develop biofilms with different thicknesses. Although biofilm remains relatively thin, there are applications where carriers can clog up completely due to the overgrowth of biofilm. 

Carrier clogging also occurs due to inorganics precipitating on the carrier surface (i.e. “scaling”) or due to the physical entrapment of solids or foreign particles present in the wastewater.

In conventional MBBR carriers, biofilm clogging drastically reduces the available protected surface area of the biofilm. This affects process performance as well as the microbial community in the biofilm, where unwanted species may thrive and compete for valuable oxygen and substrates. 

Clogged carriers are heavier, especially if there is scaling, requiring higher intensity mixing and/or carrier cleaning by mechanical or chemical means to maintain the carriers in suspension. 

Uncontrolled biofilm growth, biomass entrapment and/or scaling in conventional MBBR carriers may result in reduced/less stable performance, higher mixing and/or aeration demands and the introduction of unwanted microbial species.

 

Providing high stability and top performance

Z-MBBR targets challenging applications and/or processes where high stability and top performance are a priority. In many cases, Z-MBBR is applied to replace conventional carriers in MBBRs with problems related to clogging and/or scaling. 

Our design experts help you with greenfield projects where Z-MBBR is more suitable than conventional MBBR solutions.

 

Z-carriers demonstrating a controlled biofilm thickness of anammox bacteria - top view (left) and cross section (right). © AnoxKaldnes, 2020
Z-carriers demonstrating a controlled biofilm thickness of anammox bacteria - top view (left) and cross section (right). © AnoxKaldnes, 2020

 

Benefits of the Z-MBBR versus uncontrolled biofilm growth includes:

Higher security and less maintenance

  • No need for carrier cleaning by mechanical and/or chemical means
  • Stable treatment performance
     

Lower OPEX

  • Less mixing demand for biofilm control and/or for maintaining carriers in suspension
  • Less oxygen demand by competing species/endogenous activity

 

Stable performance

  • Stable biofilm area = stable removal rates
  • Controlled and specialized microbial community, less microbial competition
     

References

AnoxKaldnes’ technologies are found in more than 1,200 treatment plants around the world. Contact us for references related to your specific needs.

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Z-MBBR - Adding a new dimension to biofilm technology (10.41 MB)