Loading patent…
AssigneeMicrodyn-Nadir GmbH
InventorsStefan Krause, Reinhard Voigt, Peter Cornel
Estimating the term…
A method of cleaning filtration modules for the treatment of raw water, or wastewater, or activated sludge, is provided by circulating particles in untreated water. The deposits located on the filter membrane outer surfaces are removed by the mechanical action of the particles, without significantly damaging the membrane. Initially, untreated water, wastewater, or activated sludge is chemically-mechanically pretreated. Then the untreated water or wastewater polluted with biologically active material is discharged into a membrane bioreactor system having a filtration unit including at least one filtration tank. At least one submerged filtration membrane module is present in the filtration tank. The untreated water or wastewater in this filtration tank is filled with particles and circulates inside the filtration tank. The particles are non-porous, biologically resistant polymer particles. Alternatively, a cleaning tank including a circulating fluid containing particles may be provided for the temporary accommodation of the filtration module.
A method for cleaning raw water or wastewater or activated sludge filtration membrane modules, comprising
A membrane bioreactor system for treating raw water or wastewater or activated sludge having a filtration tank in which at least one submerged filtration membrane module is situated in the filtration tank, wherein the raw water or wastewater or the activated sludge in the filtration tank contains non-porous, biologically resistant particles,
A cleaning container for cleaning filtration membrane modules of membrane bioreactor systems, said cleaning container comprising particles consisting of inert polymeric material having a density of 1.0 to 1.5 kg/dm3 circulating at a concentration of 1 to 10 kg/m3 in water with air injection, said particles having a median surface roughness Rtm of less than 40 μm.
A membrane bioreactor system for treating raw water or wastewater or activated sludge having a filtration tank in which at least one submerged filtration membrane module is situated in the filtration tank, wherein the raw water or wastewater or the activated sludge in the filtration tank contains non-porous, biologically resistant particles, a feed device for gas is provided for the bottom end of the filtration membrane module, the gas streaming moves the particles upward between the membranes, and the gas is compressed air.
Dependencies are inferred from the claim text.