Mr. Jochen Kallenberg

Jochen Kallenberg.jpg

Jochen Kallenberg has a technical degree in chemical and pharmaceutical production and a higher degree in marketing. He has 25 years of extensive experience in the water & wastewater treatment industry working for global leading membrane and mineral technology companies such as Toray Industries, Inge Membranes, and Omya International. He gained his filtration know-how in different technical, sales & marketing, and business development roles and has in-depth knowledge in the fields of reverse osmosis desalination, micro-and ultrafiltration membrane processes, remineralization (post-treatment) of desalinated water, as well as in coagulation & flocculation processes. In his current role as director water treatment, he is globally responsible for Dryden Aqua’s commercialization of Activated Filter Media - AFM® - in the water and wastewater treatment market with focus replacing sand (filters) with AFM® in pre-treatment before reverse osmosis desalination.

Improving filtration performance using activated filter media AFM

Silica sand and other filter media such as (but not limited to) garnet, zeolite and anthracite are relatively good filtration media, but they are perfect home for growing bacteria on their surfaces and pore structures. Bacteria are required in biofilters such as slow bed sand filters, but in rapid gravity or pressure filters, bacteria cause a biodynamic mechanical instability of performance. Bacteria stick themselves onto the surface of sand as well as other filter media by secreting an extracellular polymeric substance (EPS), an alginate jelly. EPS forms a biofilm that provides a home for bacteria and pathogens and even protects them from oxidation by disinfectants such as chlorine.  Bacteria can double in biomass every 30 minutes and increase the differential pressure in media filtration, thereby half the length of the filtration run phase, promoting the development of wormhole channeling altogether leading to an insufficient filtration performance.


Activated Filter Media - AFM® is based on green and brown up-cycled container glass and is manufactured in state-of-the-art fully automized factories in Scotland and Switzerland. AFM® contains metal oxide catalysts which together with the oxygen in the water generate free hydroxyl radicals leading to a high oxidation potential and thereby preventing bacteria growing on the surface of AFM®. During the 3-step chemical and heat activation process the AFM® surface is highly increased by generating a mesoporous surface structure. In the activation process a negative surface charge (AFM®-s) or neutral hydrophobic surface (AFM®-ng) is established providing for superior filtration performance including excellent removal of down to sub-micron particles, heavy metals and organic molecules such as hydrocarbons and microplastics. AFM® reduces the biological risk from bacteria and parasites and is an effective barrier against Cryptosporidium, Pseudomonas and Giardia.