Method for purifying effluent, particularly continuous purification of effluent in paper industry, involves utilizing aerobic reactor, which cleans supplied effluent by aerobic microorganisms

摘要

Effluent purification involves utilizing an aerobic reactor (12), which cleans supplied effluent by aerobic microorganisms. A part of the effluent is discharged to pressure dissolved air flotation step for partial decalcifying before and after supply in the aerobic reactor to reduce the effluent contaminants. The effluent in the pressure dissolved air flotation step is adjusted with a natural or alkaline pH value, gas offset and pressurized before exposed to a reduced pressure. One precipitating or flocculation agent is added during pressure dissolved air flotation step. Independent claims are also included for: (1) a device for purification of the effluent, which comprises an aerobic reactor with one supply line for supplying effluents in reactor for cleaning; and (2) a plant for elimination of calcium carbonate, which comprises water purification unit.