METHOD OF PURIFYING WATER FROM HYDROGEN SULPHIDE AND SULPHIDES Russian patent published in 2009 - IPC C02F1/74 B01D37/02 C02F103/02 

FIELD: chemistry.

SUBSTANCE: iron hydroxide and fine carbon material are put into a granular load layer with clean washing water before washing the load is completed. After the filtering cycle and washing the granular load layer the mixture of iron hydroxide, carbon material and iron sulphide formed in the load layer is extracted together with dirty washing water, aerated, separated from it, mixed again with clean washing water and filled together with the expanded granular load layer before completion of the next washing. Catalytic action of the carbon material increases the rate of oxidation of hydrogen sulphide and sulphides with atmospheric oxygen dissolved in the purified water before feeding it into the granular load layer. Carbon material is used as the granular load or its part. Part of fine carbon material and iron hydroxide, in the layer of granular material, including sulphide obtained from oxidation through aeration, is mixed with purified water before filtration through the granular load layer after separation from dirty washing water.

EFFECT: increased efficiency of filtering works and reduced cost of purifying water or sewage water.

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