RU2230708C1 - Method and apparatus for active demanganation of liquid - Google Patents

Abstract

FIELD: purification of underground water from iron and manganese.

SUBSTANCE: method involves vacuumizing and mixing liquid flow by dispersing with oxidizer; feeding resultant gas-liquid mixture into casing with unflooded filtering charge; providing separate discharge of purified liquid and gas, with liquid flow being divided before vacuumizing process and directed through respective vacuum dispersing heads having vacuum zones communicated with one another. Oxidizer is supplied into communicated vacuum zone by self-suction followed by intensive mixing or reacting with liquid under purification process. Supplying of ozone-air mixture as oxidizer provides for oxidation of organic and inorganic difficult-to-oxidize substances in short-cycle mass exchange process. Apparatus has casing with filtering charge, liquid supplying branch pipe equipped with venturi nozzle, and mixer arranged concentrically at outer side of nozzle and made in the form of cylinders attached to nozzle and provided with gauged openings. Cylinders have gradually increasing diameter and length. Apparatus is further equipped with purified water and gas discharge branch pipes. Liquid feeding branch pipe has liquid flow distributor with outlet portions, each connected to venturi nozzle. Mixers are arranged in closed zones communicated with one another via vacuum line, which is connected to auxiliary oxidizer supplying branch pipe. Method and apparatus provide for effective joint removal from liquid of inorganic difficult-to-oxidize substances, such as manganese, and organic substances, such as phenol, humic compounds, fulvic acids. Method and apparatus may be used in systems for supplying water to populated areas, individual objects and agricultural complexes.

EFFECT: increased efficiency in water purification and wider range of use.

3 cl, 1 dwg, 2 tbl

Description

The invention relates to the purification of ground and surface waters from iron and manganese, can be used for water supply of cities, towns, individual facilities and agricultural complexes.

There is a known aeration method for purifying groundwater from iron, which is in the form of iron oxide bicarbonate in water, which consists in introducing oxygen into the water to be deferred in the form of a water-air emulsion (Copyright certificate No. 232147, class C 02 F 1/58, 1960) .

The same copyright certificate describes a device consisting of one or more sand filters, a vortex (self-priming) pump or ejector, an aerator tank with valves and a mixing unit.

The disadvantage of this method and device is the technological complexity and the inability to remove iron from water when its content is up to 30 mg / L and the presence of carbon dioxide in water over 20 mg / L.

A known method of purifying water from iron, comprising mixing the flow of purified water with air by supplying air to the mixer under pressure, spraying the air-water mixture into an unburied charge located in the filter housing with a ratio of 1: 2-1: 5 and subsequent separate removal of purified water and air (Nikolaev G.N. Iron removal from natural and circulating waters. - M.: Stroyizdat, 1978, p.25).

A device for purifying water from iron is also described therein, comprising a housing with a filter charge, a nozzle for supplying purified water, a mixer connected to it with means for supplying pressurized air to it, and outlet pipes.

A disadvantage of the known method and device is the inability to use them for water purification with a high content of iron and dissolved gases. When the iron content in water is up to 30 mg / l, CO ₂ - 100 mg / l, H ₂ S - 10 mg / l and O ₂ oxidation - 9 mg / l, the installation is inoperative.

Closest to the proposed method is a method of purifying water from iron, comprising mixing a stream of purified water with air, supplying a water-air mixture to a housing with an unburied filter load and subsequent separate removal of purified water and air. To increase the degree of purification and intensification of the process before mixing, the water stream is vacuumized and mixing is carried out by dispersing the water stream with air (copyright certificate No. 1161480, class 02 F 1/64, publ. 06/15/1985).

The same copyright certificate describes a device for water purification from iron, comprising a housing with filter loading, a pipe for supplying filter water, an attached mixer for water and air, and a pipe for removing purified water and air. The nozzle is equipped with a nozzle with a Venturi nozzle and a cylinder located concentrically on the outside of the nozzle, and the mixer is made in the form of cylinders connected to the latter with a successively increasing diameter and length and with a nozzle for supplying air.

The disadvantage of this method and device is that they are designed only for the removal of easily oxidized substances (for example, ferrous iron and hydrogen sulfide).

The proposed inventions solve the problem of removing from a liquid inorganic difficultly oxidized substances (manganese) and organic (phenol, humane compounds, fulvic acids).

To obtain such a technical result in the proposed method, which includes evacuating and mixing the liquid stream by dispersing with an oxidizing agent, supplying a gas-liquid mixture to the housing with an unburied filter load and subsequent separate removal of the purified liquid and gas, the liquid stream is separated and sent before vacuuming through the corresponding vacuum spray heads . The vacuum zones of the spray heads communicate with each other. Thus, the self-evacuation of the liquid by the liquid is ensured, which creates the conditions for volume-vacuum crushing of the jet into droplets and the instantaneous, i.e. spontaneous, release of dissolved gases from the liquid. The oxidizer is supplied to the communicating vacuum zone by self-absorption, and then there is a process of intensive mixing or reaction with the liquid being cleaned, which allows using the physical value of the process - the rate of passage of liquid through the vacuum chamber of the ejector: the higher the speed, the higher the degree of chemisorption.

The supply of an azo-air mixture as an oxidizing agent ensures the oxidation of inorganic hardly oxidizable substances (manganese) and organic (phenol, humic compounds, fulvic acids) in short-cycle mass transfer.

To achieve the above technical result, a device is proposed comprising a filter loading housing, a liquid supply pipe, equipped with a nozzle with a Venturi nozzle and a mixer arranged concentrically on the outside of the nozzle, made in the form of cylinders connected to the latter with calibration holes and with a gradually increasing diameter and length , and a branch pipe for removal of the purified water and gas. The fluid supply pipe is equipped with a liquid flow distributor with outlet sections, each of which is connected to the nozzle with a Venturi nozzle, and the mixers are placed in closed zones, interconnected by a vacuum line, which is connected to an additional oxidant supply pipe.

The proposed design allows for self-absorption of the oxidizing agent due to the rarefaction created by the initial fluid entering the pipe for supplying fluid. Due to the excess pressure of the initial liquid, a powerful rarefaction is created, as a result of which the oxidizer undergoes intense crushing and mixing along the ejection stages, which leads to a deeper oxidation of inorganic sparingly soluble substances (manganese) and organic (phenol, humane compounds, fulvic acids).

The invention is illustrated in the drawing.

The device consists of an inlet pipe 1 with a distributor 2 of a fluid flow with outlet sections, a mixer 3, a housing with a filter load 4, chippers 5, pipes 6 for exhausting evolved gases and a pipe 7 for removing purified liquid. The output sections of the liquid flow distributor 2 are equipped with a corresponding nozzle with a Venturi nozzle 8, to which mixers 3 are connected, consisting of vacuum-ejector stages 9-11, made in the form of cylinders with successively increasing diameters and lengths with calibration holes 12. Mixers 3 are placed in closed zone 13, which are interconnected by a vacuum line 14, to which is connected an additional pipe 15 for supplying an oxidizing agent. The vacuum ejector stage 11 is connected to the chippers 5 for the separation of liquid and gas.

The proposed method is carried out in the following sequence.

The fluid flow under pressure not lower than 0.35 MPa is supplied through pipe 1, is divided into flow distributor 2 and sent to the reduced pressure zone through the corresponding confusers with Venturi nozzles 8. As a result, there is an increase in the flow rate of the fluid, which leads to an increase in the pressure head and a decrease pressure in the jet, and a spherical vacuum annular zone is created around the jet with a deep vacuum of up to 0.1 MPa due to the energy of the jet itself and the process of volume boiling of gases dissolved in the jet and in a rarefied space (in particular CO ₂ , H ₂ S), which inhibit the oxidation process. From the confuser with Venturi nozzles 8, the jet enters sequentially into the ejection stages 9-11, where, due to the energy of the jet, vacuum-ring zones are formed in which the process of volume boiling of gases in the jet and the destruction of the integrity of the jet continue. In this case, the jet turns into a gas-liquid flow, filling the entire cross-sectional area of the stages of ejection 9-11 in the direction of flow. The released gases (CO ₂ , H ₂ S, ammonia, methane) contribute to an increase in pH, which creates favorable conditions for a more complete oxidation of the harmful substances present in water. Due to the rarefaction created by the initial liquid entering the inlet pipe 1, self-absorption of the oxidizer (ozone) through the calibration holes 12 is ensured, followed by an accelerated adsorption-desorption process and the final effect of desorption. From the ejection stage 11, the gas-liquid flow enters the chippers 5, hitting them, the released gases are reflected upward and discharged into the atmosphere through the nozzles 6, and the fluid moves freely through the charge 4 to the consumer through the nozzle 7.

Passing through the housing with filter loading 4, the liquid is freed from ferric iron, tetravalent manganese, etc., as well as from organic substances (phenol, etc.), previously oxidized by the ozone-air mixture for the deposited values.

Tables 1, 2 show the experimental results.

The data in table 1 show that a sufficient effect on the removal of iron and manganese of 0.3 and 0.1 mg / l is achieved at a pressure of 0.35 MPa.

The data in table 2 show the effect of cleaning to normalized values for color and turbidity.

The positive effect of the proposed method and device is that it is possible to simultaneously reduce the content of not only iron, but also manganese, as well as organic substances contaminating it in the initial liquid to normalized values according to sanitary norms and SanPiN rules.

Claims (2)

1. A method of actively demanganizing a liquid stream, including evacuating and mixing the liquid stream by dispersing with an oxidizing agent, supplying a gas-liquid mixture to a housing with an unfilled filter charge, and then separately discharging the purified liquid and gas, characterized in that the liquid stream is separated and sent before evacuation through the appropriate vacuum spray heads, the vacuum zones of which communicate with each other, and ozone-air mixture is introduced into the communicating vacuum zone as an oxidizing agent with the possibility of mixing it with the main fluid stream. 2. Device for active demanganization of a liquid, comprising a housing with filter loading, a nozzle for supplying liquid, equipped with a nozzle with a Venturi nozzle and a mixer arranged concentrically on the outside of the nozzle, made in the form of cylinders connected to the latter with calibration holes and with a gradually increasing diameter and length as well as a pipe for removing purified water and gas, characterized in that the pipe for supplying liquid is equipped with a liquid flow distributor with outlet sections, each of which toryh connected to a nozzle with a venturi nozzle, and the mixers are placed in a closed area, communicating with each other vacuum line which is connected with an additional conduit for supplying oxidant.