Production of ultra-pure water involves passing water through biofilter followed by dosing with biostatic agent before passing through reverse osmosis membrane filter to reduce total organic carbon content efficiently without biofouling

摘要

To produce an ultra-pure water, the water inflow is passed to a bioreactor (2), followed by a non-oxidizing processing stage with a biostatic action, and a final membrane filter. To produce an ultra-pure water, the water inflow is passed to a bioreactor (2), followed by a non-oxidizing processing stage with a biostatic action, and a final membrane filter. The final membrane filter (8) has a reverse osmosis action. Heavy metal compounds are added to the water in the biostatic processing stage (6), preferably copper salts and/or zinc salts, fed in together. The biological matter turnover is registered between the biostatic processing and the final stages, to set the processing actions. The water is filtered at the bioreaction stage. The water from the bioreactor is passed through an adsorption stage (5) using active carbon, before or after the biostatic processing stage. Before the water is passed into the bioreactor, it passes through a flocking and sedimentation stage. An independent claim is included for a water purification assembly with a bioreactor and especially a multiple-layer filter (2), which is cleaned by back flushing. A following dosing unit (6) adds a heavy metal biostatic agent, with a final reverse osmosis membrane filter (8). Preferred Features: A biofouling monitor (9) in front of the membrane filter measures the level of infection in the water by a germ count, to set the working of the dosing stage (6). A monitor after the bioreactor measures the assimilable organic matter (AOC) in the water, to determine the back flushing cycles of the bioreactor. An adsorber (5) is downstream of the bioreactor. A flocking and sedimentation stage (1) is in front of the bioreactor (2).