METHOD FOR BIOCATALYTIC TREATMENT OF WASTE WATERS (OPTIONS) Russian patent published in 2005 - IPC

FIELD: waste water treatment.

SUBSTANCE: invention relates to biological waste water treatment methods that can be used at enterprises of power, petroleum processing, petrochemical, chemical, paper-and-pulp, food processing, and other industries as well as for treatment of household sewage. Biocatalytic waste water treatment is performed by oxidation in air tanks or on biofilters in presence of catalytically acting substance and activated sludge. In case of air tanks, catalytically acting substance consists of one (multifunctional) or three (one multifunctional and two selective) heterogeneous catalysts for oxidation of inorganic and/or organic compounds and containing active component: variable-valence metal oxides and/or hydroxides, or spinels, and, additionally, modifying additive, in particular organic bases and/or heteropolyacids, active component being deposited on polymer carrier (polyethylene or polypropylene). Content of active component is 15-20% and that of modifying additive 0.5-20%. For oxidation of organic, sulfur, and nitrogen compounds, multifunctional catalyst is used containing active component consisting of variable-valence metal oxides and hydroxides. For nitrification process (ammonium nitrogen oxidation), selective catalyst is used containing active component consisting of variable-valence metal spinels and oxides. In case of denitrification process (reducing nitrites and nitrates into molecular nitrogen), selective catalyst is used containing active component consisting of variable-valence metal spinels and hydroxides. Oxidation process is accomplished at catalyst-to-water ratio 1:75 at consumption of air not higher than 9.0 m³/m³. Invention also discloses biocatalytic treatment of waste waters via oxidation on biofilters in presence of activated sludge and catalytically acting substance consisting of active component (15-50%): one or several variable-valence metal compounds, flux (50-10%): silicon-containing compound, modifying additive (0.5-20%): carbon-containing material, and carrier: clay.

EFFECT: increased productivity and reduced power consumption on existing treatment plants, reduced investment and operational expenses, and deepened waste water treatment.

8 cl, 5 tbl, 10 ex