HOW DOES H2L WORK?
The H2L is an submerged membrane module made from UF-SBs – Ultrafiltration Single Blocks – which are equipped with a permeate collection piping system and an air diffusor system for cross-flow aeration. The water is filtered through the membrane with a pressure difference on the permeate side. During this, colloidally dissolved substances, solids, viruses and bacteria are retained on the membrane. The water and the dissolved elements pass the membrane, collect in the drainage layer of the membrane pockets and are led via four suction points of the UF-SBs into the permeate pipework.
The substances retained on the membrane surface are depositeded and form a cake layer. As this process limits performance, it is necessary to monitor the cake layer thickness. The cross-air flow helps in removing and minimising this cake layer.
The air supply system installed below the UF-SBs in the H2L module frame uniformly distributes the required air amount as fine bubbles via several tube diffusors. The air supply system is impinged with compressed air by a blower. The tube diffusors emit the air uniformly in the form of fine air bubbles. Then the air bubbles rise and causing a water flow followed by a circulation of the water body. The flow thereby generated creates a shear force on the cake layer. This reduces or completely removes the cake layer. Aeration is carried out intermittently or continuously according to the application.