Four ways to save money with Hybas™

AnoxKaldnes Hybas™ is a cost-effective way to remove nitrogen and improve the capacity of your existing nitrogen-removal process. Here’s how you’ll save money.

Four ways to save money while removing nitrogen with Hybas™

Without nitrogen, there would be no life, but too much of it in wastewater is a danger to both human health and our whole ecosystem. Here are four ways AnoxKaldnes Hybas™ provides a cost-effective way to remove nitrogen and improve the capacity of your existing nitrogen-removal process. 


Energy efficient

AnoxKaldnes Hybas™ is equipped with carriers that improve oxygen transfer into the biofilm. The Hubgrade online control system optimizes performance and prevents over-aeration. Being an activated sludge, only a smaller part of sludge volumes utilizes carriers. That means the same energy efficiency numbers apply to all other volumes. Biogas potential from sludge is approximately 30% higher than the biogas yield obtained from an activated sludge designed for extended nitrogen removal without carriers.

Higher biomass activity through shorter sludge age

The denitrification rate in Hybas™ can be several times higher than rates found in activated sludge processes with long sludge age. The anoxic fraction of the total volume is also higher, keeping denitrifiers working for a larger percentage of the time. 

Better removal of micropollutants

By combining activated sludge and biofilm in Hybas™ you can expect a 20% improvement in micropollutant removal. Combining Hybas with post-treatment for further micropollutant removal can decrease operating costs downstream compared to treatment after activated sludge only.

Chemical-free phosphorus removal 

You can apply all different types of Enhanced Biological Phosphorus Removal (EBPR) in AS-systems in Hybas™.



Marquette-lez-Lille, France, WWTP
Hybas™ is a solution for nitrogen removal based on Integrated Fixed Film Activated sludge (IFAS) technology, where the best properties of MBBR and Activated Sludge (AS) are merged into one compact, energy-efficient system.

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