RU2220914C1 - Water deferrization process - Google Patents

Abstract

FIELD: water treatment. SUBSTANCE: deferrization of water under domestic conditions consists in forcing water-air mix through dry rotary film in radial direction relative to its axis of rotation. Implementation of the method involves domestic water deferrizator having air turbine with axially- mounted impeller and fine-fiber filter in the form of nonwoven polyester fiber fixed in turbine outside of blades. EFFECT: improved water treatment efficiency without periodical cleaning of filter and without changes in temperature and atmosphere pressure in water.

Description

 The invention relates to the field of water purification from iron and may find application in the water supply of garden plots when using household deferrizers.

 Known methods for deferrization of water by passing a water-air mixture through a dry stationary filter / 1-3 /. The disadvantage of such methods is the siltation of the filter with insoluble salts of iron and the need for frequent washing it.

 The closest in technical essence is the method described in a. from. 732211.

 The aim of the invention is to provide a more efficient method that does not require washing the filter. For this purpose, the water-air mixture created by the de-ironing agent is passed in a direction radial with respect to the axis of rotation through a dry rotating filter. The use of a rotating filter increases the efficiency of the method by increasing the filtration rate and the reaction rate. The filtration rate increases due to the action of the centrifugal force on the air-water mixture passing through the filter. The reaction rate also increases. Filter fibers coated with a film of catalyst formed during the dehydration of Fe salts are washed with water with a maximum concentration of dissolved Fe salts, and water after contact with a catalyst with a lower concentration of dissolved Fe salts is discarded by centrifugal force. The magnitude of the centrifugal force is proportional to the mass of the substance, so the flakes of iron dehydrate are discarded faster than the purified water and do not silt the rotating filter. Purified water constantly wets the surface of the fibers coated with a catalyst film. This allows you to use the filter without washing it, which is an additional advantage of the method.

 To implement the method, you can use a household water de-ironing machine having an air turbine with a centrifugal pump on its axis and a fine fiber filter in the form of a non-woven polyester fabric, mounted in the turbine outside its blades. The filter may be two-layer, with an inner layer of fiberglass or other material.

 The centrifugal deferrization pump is immersed in a vessel with purified water and the device is connected to the mains. A centrifugal pump connected to the air turbine picks up water and sprays it inside the air turbine. At the same time, the horizontal blades of the turbine create a powerful air pressure. Vertical turbine blades hit water sprays and give them acceleration in a direction radial to the axis of rotation. Thus, the water-air mixture is passed under pressure through a rotating filter. It is essential that the fibers or granules of the filter give the air-air mixture additional radial acceleration during its passage through the filter.

 Strong and repeated crushing of the purified water droplets in the air stream leads to the effective interaction of the Fe salts dissolved in it with atmospheric oxygen and the dehydration reaction that occurs inside the filter on the surface of fibers or granules coated with a catalytic film of iron oxides. Salts of Fe turn into an insoluble form in the form of flakes. In addition, crystallization nuclei are formed on the surface of the catalytic film, on which grains of iron oxide grow in a powerful air stream. Centrifugal forces drop them together with dehydrate flakes from the filter onto the inner wall of the device body and they flow down with water and settle to the bottom of the vessel. However, the flakes of insoluble salts of iron remain in suspension when the iron is removed, and together with water they are again and again lifted by a centrifugal pump and sprayed inside the turbine.

 The presence of dehydrate flakes in the water does not interfere with the reaction, but rather accelerates it, since the flakes do not cover the catalytic film and again become larger when the air-water mixture passes through the filter.

 At the first use, preliminary preparation of the device is required, in which the device passes the purified water through the filter for two to three days, until a noticeable brown catalytic film forms on the fiber filter.

 The proposed method of water deferrization was implemented to purify water from an artesian well 75 m deep in the Shakhovsky district of the Moscow Region. The initial content of dissolved iron salts in water was 2.59 mg / L. As an indicator of the concentration of dissolved iron salts, a solution of potassium iron-hydrogen sulfide in pure well water containing no dissolved iron salts was used at home. The weak solution had a pale pink color. A weak solution of potassium iron-hydrogen sulfide in Moscow tap water has the same color, with a concentration of dissolved iron salts of not more than 0.3 mg / l. When artesian water was added to it, it immediately acquired a bright purple color. The cyclic deferrization operation continued until the sample of purified water stopped changing the pale pink color of the control indicator. After settling, the purified water was filtered through activated carbon.

 The proposed method does not require changes in temperature and atmospheric pressure of the treated water.

Sources of information
1. Zolotova E.F. Water purification from iron. M., Stroyizdat, 1975.

 2. Copyright certificate 814884, 25.03.81.

 3. Copyright certificate 732211, 07/14/77, prototype.

Claims (1)

A method of iron removal of water, including creating a water-air mixture, followed by passing a water-air mixture through a dry filter, characterized in that the water-air mixture is passed through a dry rotating filter in a radial direction.