JPH05309217A - Filter system in filter - Google Patents

Abstract

PURPOSE:To provide a filter system where chlorine compounds and wastes derived from inorganic and organic substances included in original liquid are adsorbed and simultaneously high precision and long filter life are obtained. CONSTITUTION:In a filter system, plural filter elements 1 consisting of a material, such as ceramics, resin, carbon, metal, etc., each of which is formed in the shape of a cylinder and has through-porosity, are arranged in parallel and connected in series. Fine powder and particles of active in parallel and concentrating tank 9 installed between an original liquid tank 7 and the filter elements to perform circulating filtration, causing the active carbon and fine powder to be deposited as the filter residue on the surface of the filter elements and forming a separate filter membrane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is generally used for filtration of liquids such as hot water, water or oil. It separates and purifies inorganic and organic substances contained in the undiluted solution, and By performing concentrated circulation, activated carbon fine powder as a filtration residue forms a new filtration film on the filtration membrane of the filter element, improves the accuracy of filtration, and solids in the liquid that are about to be deposited on the fine powder. The present invention relates to a filtration system of a filter that facilitates shearing of substances and that can adsorb waste substances of chlorine compounds, inorganic or organic origin in liquid.

[0002]

2. Description of the Related Art Conventionally, for filtering liquids containing high concentrations of inorganic and organic substances, avoiding the use of fibrous or porous resin-based hollow fiber pipes that are difficult to regenerate even if they are clogged, In many cases, an apparatus equipped with a plurality of filter elements made of resin and a through-hole porous ceramic formed into a cylindrical shape that can be backwashed with water and subjected to oxidation regeneration treatment with heat or liquid is often used.

However, in order to use the filter element stably for as long as possible until it is regenerated by backwashing, a high-speed parallel flow is made to flow inside or outside the filter element for use.
Shear the cake layer adhering to the filter element,
It is preferable to minimize the deposited layer of solids.

Further, even when backwashing is performed, it is desirable to keep a high-speed parallel flow on the backwashed side.
Normally, when using cylindrical through-porous ceramics and resin filter elements installed in multiple filtration tanks for use, the tank diameter in which the filter elements are installed in parallel is much larger than the piping that feeds liquid or gas. Therefore, the flow velocity decreases sharply, and a high-speed parallel flow effective for shearing the cake on the surface layer of the filter element cannot be obtained.
There is a drawback that clogging occurs early and the frequency of backwash regeneration increases.

Further, in order to concentrate the liquid to be continuously supplied to a predetermined degree of concentration without repeating the circulation, it is necessary to install a plurality of devices themselves, which is a considerable number.

Therefore, the applicant has arranged a plurality of single filter elements in series, and causes the liquid to be filtered to flow inside or outside the cylindrical filter element in parallel at a high speed to form a cake layer deposited on the side surface of the filter element. It was proposed that the ash be peeled off by shearing with a high-speed water stream and placed on running water and discharged.

It has also been proposed that, by flowing while filtering the inside or outside of the element, the element is concentrated every time the distance elapses, and the desired degree of concentration can be obtained depending on the number of installed elements.

[0008]

However, even if the deposited cake of the filter element is effectively sheared,
It was difficult to remove the bottommost cake remaining on the surface.

[0009]

Therefore, according to the present invention, a plurality of single porous filter elements having a through-hole formed by molding a material such as ceramics, resin, carbon, and metal into a cylindrical shape are arranged in series to obtain a fine powder of activated carbon. By flowing a parallel flow containing it and circulating filtration between it and the concentration tank, thin-film activated carbon in the form of a thin film that is difficult to be sheared and separated is deposited on the surface layer of the filter element as the filtration residue of the bottom layer, and new filtration is performed. The present invention provides a filtration system of a filter that can be used as a membrane and can improve filtration accuracy.

Another object of the present invention is to:
A high-speed parallel flow containing a plurality of single porous filter elements, which are made of ceramics, resin, metal, carbon, etc., formed in a cylindrical shape, arranged in parallel and connected in series, containing powder or granular activated carbon. It is intended to provide a filtration system of a filter capable of adsorbing and purifying organic matter, gas and the like in the stock solution by flowing and circulating and filtering between the concentrate and the concentration tank.

Furthermore, a plurality of single through-porous filter elements formed by cylindrically molding a material such as ceramics, resin, carbon or metal are arranged in parallel and connected in series, and powder is provided inside or outside the filter element. A high-speed parallel flow containing body or granular activated carbon is passed and circulated between the concentration tank and the impact force of the activated carbon and the shearing force of the high-speed parallel flow to efficiently and effectively maintain the constant self of the filtration membrane. It is intended to provide a filter system of a filter that can be regenerated.

That is, according to the present invention, a plurality of single filter elements made of a through-porous material such as ceramics, resin, carbon, and metal used for filtering a liquid are arranged in parallel, connected in series, and filtered. By creating a circulating flow of the filtrate between the concentration tank and the stock solution tank, the stock solution containing powdered or granular activated carbon is subjected to a cycle filtration process to increase the degree of concentration, and the activated carbon fine powder on the side of the filter. The body is deposited as a filter residue on the bottom layer to form a coating, which forms a new filtration membrane to improve the accuracy of filtration. Furthermore, the stock solution will form a high-speed parallel flow on the filter side surface and be deposited on the surface layer of the filter element. The cake due to the filter residue is subjected to shearing, and the impact force of the filter residue and activated carbon amplifies the peeling effect, and the film is constantly backwashed by constantly providing the self-regenerating function of the membrane. It is an Abstract that constitute the period as a feature that has considerably extendable.
A system for circulating and concentrating the filter element, the concentration tank, and the stock solution tank in series according to the present invention will be described below with reference to the illustrated embodiment.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an outline of a system for carrying out the present invention, in which 1 is a through-porous filter element formed by molding a carbon material into a cylinder, and a tank-shaped container 2 made of resin or metal It is inserted with an appropriate gap serving as a parallel-flow pressure-feeding passage, from the undiluted solution inlet 3 through the connection pipe 4 to the undiluted solution outlet 5.

The stock solution pumped through the gap between the tank-shaped container 2 and the filter element 1 is filtered toward the inner cylinder side of the filter element 1 and flows through the purified water passage 6 in series. Looking at the operation of the system, 7 is a stock solution tank such as a bath or pool, which is sucked up by a water level controllable pump-18 and discharged to a strainer 10 in a concentrating tank 9 to form a coarse solid solution of the stock solution. Scraped and moved to the concentration tank 9 containing powder and granular activated carbon.

The suction pipe 11 guides the stock solution containing the activated carbon in the concentrating tank 9 to the pump 212, the stock solution is pressurized and sent to the stock solution inlet 3 through the stock solution outlet 5, and the original concentrate tank 9 is again supplied. Returned inside. The shortage that has been filtered and returned to the stock solution tank 7 is replenished by the pump-18.

At this time, the high-speed parallel flow causes a shearing force, and the filtration residue and the activated carbon cause an impacting force, which produces the effect of minimizing the separation and accumulation of cake, but the pores and pores in the surface layer of the filter element 1 are generated. A fine film of activated carbon adheres to the periphery in the form of a thin film coated, and by controlling the particle size of the activated carbon fine powder, a new precise filtration membrane can be obtained.

Reference numeral 13 is a backwash water tank, which is branched from the purified water passage 6. When the filter membrane of the filter element 1 does not recover only by self-regeneration by shearing the cake due to high-speed parallel flow during daily operation, filtration residue, and cake separation due to the impact force of activated carbon particles, the water shutoff valves 14, 15 And 16 are closed, the water shutoff valve 17 is opened,
A backflow circuit is selected by the three-way valve 18, the purified water in the backwash water tank 13 is backflowed using the water intake pipe 19, and backwash is performed from the clean water passage 6.

At this time, in order to remove the solid matter separated from the filter element 1 by the backwash pressure feed water, the pump-212 is kept operating and the water shut-off valve 14,
It is effective to repeat the operation of opening 15 and returning the three-way valve 18 to the closed position.

It is still more effective to use high-pressure gas or steam for backwashing alone or in combination with purified water for backwashing.

FIG. 2 shows the change in the amount of filtered water in the circulating concentration system containing activated carbon of the embodiment compared with that of the circulating concentration only containing no activated carbon particles. Little change occurred during the 5 hour test.

[0021]

[Table 1]

After the test, when it was taken out from the tank-shaped container and inspected, almost no accumulation of cake was observed. The test liquid used was a graphite material having an average pore size of 2.17 μm (the particle size distribution is shown in Table 2) adjusted to 200 ppm and an average pore diameter of 2.8 μm, a porosity of 25.4%, and a thickness of 4.5 mm. 1000mm filter element consisting of 4
The book was placed and tested as in the example FIG. The activated carbon used was one in which a hard and granular palm shell was activated by carbonization, and the average particle size was 0.3 mm.
200 g per 5 liters was dispersed by stirring.

[0023]

[Table 2]

Table 1 is a comparison of the filtration accuracy between the case where the activated carbon fine powder was added and the case where it was not added in the examples. The filter element used has an average pore size of 5.0
A thin plate having a thickness of 1.5 mm and a porosity of 32.0% was used. The test solution had an alumina average particle size of 2.17 μm (particle size distribution is Table 2) of 200 ppm, as in the test of FIG.
What was adjusted to was used. In addition, the activated carbon used was different from the one in the test shown in FIG. 2 in which the original coconut shell activated carbon having an average particle size of 50 μm was micronized with an attritor for 5 hours to have an average particle size of 0.5 μm. With activated carbon,
In each of the examples, the undiluted stock solution was circulated and filtered for 30 minutes, sampled with water, filtered through a membrane filter having a precision of 0.1 μm and dried, and then the weight of permeated alumina particles was measured and compared.

As shown in Table 1, it was observed that a thin film of activated carbon fine powder which is not easily sheared and separated forms a new filtration membrane, the filtration accuracy is improved, and the one which is not put is greatly improved.

[0026]

As described above, according to the present invention, a circulating flow of the filtrate is provided between the cylindrical filter element made of a material having a porous structure such as ceramics, resin, carbon and metal, the filtration concentration tank and the stock solution tank. By making it, the undiluted solution containing fine powder of activated carbon adheres to the pores of the filter element surface layer and its periphery as a thin film-like filtration residue that is not easily sheared during the filtration process, and forms a new high-precision filtration membrane. Have the real benefit of being able to.

In addition, according to the present invention, a circulating flow of the filtered liquid is formed between the cylindrical filter element made of a through-porous material such as ceramics, resin, carbon, and metal, the filtration concentration tank, and the stock solution tank to make a powder flow. The stock solution containing the body and granular activated carbon increases the concentration as the circulation is repeated, and the high-speed parallel flow shears the cake of the filtration residue to be deposited on the surface layer of the filter element, and the activated carbon particles and powder are It has the practical advantage that the cake layer can be peeled off by impact, resulting in a constant self-regenerating force and minimizing the adherence of filtration residues.

Further, according to the present invention, a circulating flow of the filtrate is provided between a plurality of single cylindrical filter elements made of a porous material such as ceramics, resin, carbon and metal, a filtration concentrating tank and a stock solution tank. By making, the powdered and granular activated carbon exerts an adsorption action on the stock solution introduced in the long process from the concentration tank to the filtration and water permeation, and organic matter,
It has the practical benefit of adsorbing gas.

[Brief description of drawings]

FIG. 1 is a system diagram for performing filtration processing between a plurality of cylindrical single filter elements arranged in series and a concentration tank and a raw water tank.

FIG. 2 is a chart showing a comparison of the results of a time-dependent change test of the filtered water permeation amount with and without activated carbon particles.

[Explanation of symbols]

 1 Filter element 2 Tank-like container 3 Undiluted solution inlet 4 Connection pipe 5 Undiluted solution outlet 6 Clean water passage 7 Undiluted solution tank 8 Pump-1 9 Concentrating tank 10 Strainer 11 Suction pipe 12 Pump-2 13 Reverse wash water tank 14 15 16 17 Water stoppage Valve 18 3-way valve 19 Intake pipe 20 Return pipe

Claims (3)

[Claims] 1. A plurality of single filter elements made of a material such as a through-hole porous ceramics, resin, carbon or metal formed in a cylindrical shape are arranged in parallel and connected in series to form a stock solution tank and a filter element. By putting fine particles of activated carbon and particles in a concentration tank provided between them and performing circulation filtration,
A filtration system of a filter characterized in that activated carbon and fine powder are deposited as a filtration residue on the surface layer of a filter element to form a separate filtration membrane, which makes it possible to improve filtration accuracy. 2. A plurality of single filter elements made of the material of porous cylindrical ceramics, resin, carbon, metal or the like formed in the cylindrical shape of claim 1 are arranged in parallel and connected in series to form a stock solution tank. By adding fine particles and particles of activated carbon to a concentration tank provided between the filter element and circulating filtration, in addition to separation of solid matter in the filtration step,
A filtration system for a filter characterized by being able to adsorb chlorine compounds, organic and inorganic wastes, and ionized substances contained in the stock solution. 3. A concentrating tank provided between a stock solution tank and a plurality of single filter elements made of a through-porous ceramic, resin, carbon, and metal formed in a cylindrical shape, arranged in parallel and connected in series. Activated carbon powder is put into the tank, and is circulated and concentrated between the concentrating tank and the concentrated tank. The accumulated cake layer on the filter element surface is sheared and separated by the high-speed parallel flow and the activated carbon powder and particles in the concentrated filtrate. A filtration system of a filter characterized by constantly preventing clogging of the filter element and improving the life of filtration by putting it in the flow.