METHOD OF PURIFICATION OF A LIQUID FROM IMPURITIES BY FILTRATION Russian patent published in 2005 - IPC

FIELD: methods of purification of liquids from impurities by filtration.

SUBSTANCE: the invention is pertaining to the field of purification of liquids from impurities by filtration and may find application in the processing technique of purification of the natural, recirculated and waste waters, preparation and purification of various liquid mediums in some processes of a chemical technology. The method of purification of liquids from impurities by filtration consists that the coagulant or the products of its hydrolysis are partially or completely introduced into the main part of the layer of the granular charge before beginning of the filtration process. At that as a coagulant to be introduced into the granular charge use salts of metals or their hydroxides with a low-level rate of oxidation, and in the subjected to purification liquid before its feeding into the granular charge or during filtration process dissolve oxygen and-or introduce other stronger oxidizing agent into it. After a mudding of the first along the run of the filtration layers of the granular charge a unit of the stream of the being purified liquid together with reactants are directed to the following little polluted layers omitting first layers. As a coagulant it is recommended to apply a green vitriol, and in the capacity of the oxidizing agent introduced together with oxygen - hydrogen peroxide. The offered method allows to improve efficiency of purification of a liquid from the dissolved impurities and to reduce expenditures for its purification.

EFFECT: the invention ensures improved efficiency of purification of a liquid from the dissolved impurities and reduced expenditures for its purification.

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