Aqwise Wise Water Technologies

- Model IFAS - Integrated Fixed-film Activated Sludge


Aerobic treatment for water and wastewater is highly effective and widely in use worldwide. Aqwise AGAR® (Attached Growth Airlift Reactor) technology is a proprieatry process that utilizes biofilm grown on carrier media which aerobically degrade soluble organic pollutants in wastewater.

The AGAR IFAS (Integrated Fixed-film Activated Sludge) process combines conventional activated sludge technology and biofilm systems into a single reactor. In general an IFAS configuration is similar to an activated sludge plant, with biomass carriers utilized in specific stages of the process. This creates a synergy between two distinct biological processes: the MLSS degrades most of the organic load (BOD), and the biofilm creates a strong nitrifying population for oxidation of the nitrogenous load. IFAS is typically used to upgrade existing plants to enhance nitrogen removal, or in the design of new plants to enable extensive BOD and nitrogen removal.


The heart of the IFAS process lies in the competition between microorganisms growing in the liquid sludge, and those growing on the Carriers. As the suspended biomass has an absolute advantage over the fixed biomass in soluble BOD assimilation, the biomass developing on the Carriers consists almost entirely of nitrifying bacteria. As a result, the same tank contains two different microbiological populations executing completely different functions, thereby greatly increasing the treatment potential within the same volume. By using advanced modeling and in-depth process design tools, the size, location and quantity of biomass carriers in each of the process stage can be accurately determined to achieve extremely precise nutrient removal.

The AGAR IFAS process is the perfect solution for upgrading existing plants to Biological Nutrient Removal, without adding reactor volume. In addition, the IFAS process can be used to increase plant treatment capacity with no addition of tankage.

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