FIELD: chemistry.
SUBSTANCE: invention can be used to treat household waste water or waste water with similar composition to household waste water, concentrated with organic contaminants. In order to realise the method, initial waste water undergoes mechanical treatment with extraction of dispersed mechanical impurities. The obtained water undergoes anaerobic treatment with content of dissolved oxygen not higher than 1 mg/l, followed by aerobic treatment using free-flowing sludge with concentration of 4-6 g/l with content of dissolve oxygen of 2-4 mg/l. After intermediate settling, the formed water-sludge mixture undergoes floatation in the presence of a bioreagent containing a culture of Zoogloea bacteria and Chlorella algae, immobilised on a metal support, followed by final settling. The obtained treated water is taken for decontamination. The residue after intermediate and final settling, which contains active sludge, is recirculated for anaerobic treatment. The excess active sludge undergoes aerobic stabilisation, followed by mechanical drying. The method is realised in a single block-modular structure, fitted with aeration, airlifting and recirculation systems.
EFFECT: invention enables to cut treatment time and volume of the formed residues, increase degree of purification of waste water from contaminants to the maximum allowable concentration set for water bodies for fishing purposes.
1 dwg, 2 ex
