METHOD OF PROCESSING SEWAGE WATERS Russian patent published in 2014 - IPC C02F9/04 C02F1/72 C02F1/74 C02F101/38 C02F103/36 

FIELD: chemistry.

SUBSTANCE: invention can be used for processing sewage waters of the production of nitroaromatic or nitrohydroxyaromatic compounds, for instance, nitrobenzene or dinitrotoluene. To realise the method two-stage processing, including a stage of preliminary reduction and a stage of wet oxidation, is carried out. At the first stage alkaline sewage water is mixed with an organic reducing agent, which does not form salts in the sewage water, selected from peat, brown coal and/or hard coal. Processing in reducing conditions is carried out with heating to a temperature from 80 to 200°C and exposure at the said temperature for the time period from 5 min to 5 hours. At the second stage the sewage water obtained at the first stage is acidified and subjected to oxidation with oxygen-containing gas, for instance oxygen.

EFFECT: method suggests a technically safe, simple and economic technology of processing and purification of sewage waters, providing the reduction of harmful admixture to the level, acceptable for the supply of processed sewage waters to biological purification.

4 cl, 5 tbl, 6 ex