Adsorption process with granulated activated carbon (GAC)
Adsorption with granulated activated carbon (GAC, German GAK) is a simple, reliable and, above all, low-maintenance process. This makes it ideal as a fourth treatment stage, especially for smaller wastewater treatment plants.
The core component of the process is the HUBER Active Carbon Filter CONTIFLOW® GAK, which is filled with granulated activated carbon and acts as an adsorber for the micropollutants. The particle size of granulated activated carbon (GAC) is usually between 0.5 mm to 4 mm.
GAC
Granulated Activated Carbon
The HUBER Active Carbon Filter CONTIFLOW® GAK is installed downstream of the biological treatment stage. The wastewater flows through the carbon bed and the trace substances are adsorbed onto the activated carbon. An additional separation stage downstream of the HUBER Active Carbon Filter CONTIFLOW® GAK is not required. After reaching the adsorption capacity, the loaded activated carbon is replaced by fresh carbon. The loaded activated carbon can be reactivated and then used again for adsorption.
One way of optimizing the process, depending on the requirements and boundary conditions, is to use ozone. In this case, an ozonation stage is provided upstream of the adsorption stage.
Ozone (O3) is a strong oxidizing agent and is therefore able to oxidize at least some of the organic trace substances that are difficult to degrade. This significantly increases the broadband effect and also extends the service life of the activated carbon.
In practice, the use of a filter stage before the elimination of trace substances has proven successful. This allows dirt and impurities to be reliably separated and thus do not reach the activated carbon bed or the ozone system. In addition to being easier to maintain, the filtration stage can also be used as a flocculation filter for phosphorus elimination at the same time, resulting in a valuable synergy effect.
For this application, both the HUBER Rotafilt® cloth filter and the HUBER CONTIFLOW® sand filter are ideal key components.
Products
HUBER Products for Granulated Activated Carbon Process
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