Method for treating wastewater of oleaginous fruits- and grain processing, comprises purifying the wastewater by separation of solid materials and oil droplets, and then concentrating in a reverse osmosis plant

摘要

The method comprises purifying wastewater of oleaginous fruits- and grain processing by separation of solid materials and oil droplets, and then concentrating in a reverse osmosis plant (28). The wastewater passes to two microflotation plants (18, 26) that produce gas bubbles with an average diameter of 20-70 mu m. The purified wastewater after passing to the microflotation plant has a blocking index of 5 min 1and is brought without interconnection of nanofiltration and/or an ultrafiltration and/or microflotation of the reverse osmosis plant. The method comprises purifying wastewater of oleaginous fruits- and grain processing by separation of solid materials and oil droplets, and then concentrating in a reverse osmosis plant (28). The wastewater passes to two microflotation plants (18, 26) that produce gas bubbles with an average diameter of 20-70 mu m. The purified wastewater after passing to the microflotation plant has a blocking index of 5 min 1and is brought without interconnection of nanofiltration and/or an ultrafiltration and/or microflotation of the reverse osmosis plant and further cleaning section of the reverse osmosis plant. The wastewater before passing to the microflotation plant passes to a pre-separator (14) or a tube flocculator (16). A flocculant is added to the wastewater before passing the wastewater to the microflotation plant and/or to the tube flocculator. An independent claim is included for a plant for treating wastewater of oleaginous fruits- and grain processing.