NEW: MOFIX biofilm process for biological sewage treatment

What does MOFIX mean?

MOFIX (MOving bed + FIXed bed) is a process combining both biofilm technologies.

A special feature of this application is the denitrification in a moving bed as first process step. Here random media is used as biofilm carrier. In the second step the final BOD reduction is carried out by a submerged fixed bed, followed by an intermediate clarifier which eliminates excess sludge. Now the nitrification reactor follows, consisting of a 2-3-stage cascade equipped with BIOdek® fixed beds. A final clarifier removes solids before the water exits.

The MOFIX process is based on biofilm technology and has been developed and tested in a joint research project of GEA 2H Water Technologies and the Martin-Luther University Halle-Wittenberg. A pilot plant was operated and tested in Halle (Saale), before being transferred and built up in Tunisia. Since 2008 a village of 200 inhabitants has been using the plant for full biological treatment. The concept has meanwhile been implemented in several plants in Germany including a large oil processing site in Germany.

MOFIX Sewage Treatment Plant

GEA 2H fills and lamella clarifier in the MOFIX process

The MOFIX process is run with GEA 2H fills BIOdek® and lamella clarifiers TUBEdek®

Moving Bed

The denitrification reactor is equipped with GEA 2H Random Media BCN. A special agitator mixes the water and the random media. Although moving slowly, the agitator develops a high stirring power with only low shearing forces, thus conserving the biofilm on the carriers.

Fixed bed

In the aerated zones only fixed bed consisting of BIOdek® structured packing is installed, because of the advantages of fixed beds. For the carbonaceous oxidation step BIOdek® KVP vertical flow fills provides optimum features for discharge of the excess sludge. For nitrification after intermediate clarification high specific surfaces of BIOdek® provide high efficiency.
	Nitrification in fixed bed

Sedimentation

Intermediate and final clarification are equipped with GEA 2H TUBEdek® tube settlers. An efficient sludge removal is achieved by the chevron shaped equidistant TUBEdek® channels giving a multiplication of sedimentation area in a small volume even with high recirculation rates.

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