KR101699682B1 - The wastewater treatment system by electrolysis and filtration sponge - Google Patents

Abstract

The present invention relates to a wastewater treatment system using electrolysis and filter media made of a sponge material. The wastewater treatment system according to the present invention comprises: a sedimentation tank which stores wastewater entering via a screen, and which sediments sludge by using gravity; a plurality of injection conduits which distribute predetermined amounts of treated water so that impurities contained in the treated water obtained in the sedimentation tank can be removed in an electrolysis cell including a full-bridge converter power means and the treated water obtained in the electrolysis cell is introduced and filtrated; a compression plate which compresses sponge filter media below the injection conduit; the sponge filter media which remove fine floating materials in the treated water by using porous materials; a filtration tank which includes a porous plate configured to discharge the treated water in a downward direction when the sponge filter media is compressed and a discharge conduit configured to discharge the filtrated treated water out of the filtration tank; and a filtration tank which stores the treated water discharged from the former filtration tank, and which discharges the treated water to the outside. A power conversion means including a full-bridge converter is installed in the electrolysis cell, and thus output voltage can be kept stable, thereby minimizing power consumption and reducing maintenance costs accordingly. A water treatment effect can be increased by using multiple sponge filter media. When target treated water is injected into the sponge filter media, the sponge filter media is compressed, and thus process time is reduced, thereby reducing process time required for water treatment. Bio-cellulose having desirable absorption and adsorption performance may be added to the sponge filter media, and thus an organic material and metal adsorption effect may be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment system using electrolysis and a sponge filtration apparatus,

The present invention relates to a wastewater treatment system using an electrolysis and a sponge-made filter medium. More particularly, the present invention relates to a wastewater treatment system using a filtration material, A plurality of injection pipes for removing impurities contained in the treatment water in an electrolysis tank provided with electric power means, for introducing the treated water treated in the electrolysis tank and filtering the treated water, and distributing the treated water to the inside of the electrolysis tank; A sponge filter material for removing fine suspended matters in the treatment water by a porous material, a perforated plate for discharging the treated water downward when the sponge filter material is compressed, and a discharge pipe for discharging the filtered treated water to the outside of the filtration tank A filtration tank for storing the treated water discharged from the filtration tank, It relates to a waste water treatment system using a sponge made of electrolysis and filtering device.

Since the activated sludge process, which is generally used in public sewage treatment facilities, mainly removes organic matter and solids, untreated nutrients in the effluent are present at a high concentration and discharged into the water system. Recently, In addition, it is evolving into an advanced sewage treatment method that treats even toxicity.

In order to remove the organic matter and nutrients remaining in the effluent discharged into the water system, a method applicable to the existing public sewage treatment facilities is being added and improved. The additional methods are implemented by physicochemical methods and biological methods, The physico-chemical methods include ammonia stripping, coagulation and precipitation, and reverse osmosis. The biological nutrient removal methods include A / O (Anoxic / Oxic) h A ₂ / O (Anaerobic, Anoxic, Oxic) method.

On the other hand, physicochemical methods and biological methods added to remove organic matter and solids that can not be treated by the activated sludge process require additional costs due to the use of chemicals, increase in sludge generation and sedimentation, The biological treatment method requires a hydraulic retention time of 5 hours or more in order to meet the discharged water quality standard and has a disadvantage that it is difficult to apply to domestic sewage having a low BOD / TN ratio have.

In addition, the investment cost of the initial facility is increased due to the enlargement of the processing size and range by the additional methods, and in particular, the biological method is excellent in adapting to external physical changes, but the process is complicated, And the power consumption of the sewage treatment plant is 0.5% of the total power consumption in Korea, which causes a problem that the power consumption due to the addition of the construction method is further increased.

In order to solve the above-mentioned problems, a water treatment technique using an electrolysis process and a sponge filter material has been developed. The prior arts include Korean Patent No. 10-1306980 (Feb. And electrolytic means for electrolyzing the water to be treated so as to supply iron ions to the water to be treated flowing into the oxic tank, wherein the electrolytic means is a device And an electric power supply unit for supplying electric power to the electrode unit. The steel plate of the electrode is heat-treated for 3 hours, and is heat-treated for 3 hours. The electrolytic cell is disposed in the detoxification tank, Technology, and Korean Patent No. 10-1488965 (Feb. 02, 2015), a wastewater treatment water filtration using sponge filter media It provides the value of suspended solids and dissolved matter and bacteria to the treated wastewater using a sponge filter material enough to use filtration as a possible water quality water for over a sponge filter material, such as filter system contained in the treated water treated in wastewater treatment facilities.

However, the above-mentioned prior arts also have a problem of a high initial investment cost, a problem of power increase due to the pressing operation of the electrolytic device and sponge filter media, and a long time in the water treatment process.

Korean Registered Patent No. 10-1306980 (Mar. Korean Patent No. 10-1488965 (Feb.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a sewage treatment method and a sewage treatment method, And to provide a wastewater treatment system using an electrolysis and a sponge filtration apparatus that completes a water treatment process within a short time in an efficient manner by reducing power consumption and simplifying the process and consuming problems and long time required for water treatment.

In order to solve the above problems and to achieve the object, the wastewater treatment system using the electrolysis and sponge filtration apparatus according to an embodiment of the present invention comprises a settling tank, an electrolysis tank, a filtration tank and a discharge tank, The electrolytic bath in which the incoming wastewater is stored, the sludge is settled by gravity, and the treated water treated in the settling tank is removed from the electrolytic bath equipped with the full-bridge converter power means, A plurality of injection pipes 10 for distributing the treated water to the inside of the filtration tank in the upper part, a sponge filter medium 30 in the lower part of the injection pipe 10, A sponge filter medium 30 for removing fine suspended particles in the treatment water by a porous material, a sponge filter medium 30 for filtering the sponge filter medium 3 And a discharge pipe 50 for discharging the filtered treated water to the outside of the filtration tank. The compression plate 20, the sponge filter media 30, A plurality of layers are formed in the filtration tank, and the discharge tank stores the treated water discharged from the filtration tank and discharges the treated water to the outside.

The sedimentation tank is filled with a flocculant mixed with acetic acid, shell powder or coral powder at a weight ratio of 1: 0.1 to 0.9: 0.3 to 0.5, with a selected one of aluminum sulfate and aluminum chloride containing aluminum oxide at a concentration of 7 to 10% .

Wherein the electrolytic bath comprises an aluminum or iron electrode and the full-bridge power means comprises a converter stage consisting of four diode current stages and four switches, two for each leg, and an output filter stage for sending current to the electrodes, : 1, and one of PQ, RM, EFD, and EPC is used as a core. In order to prevent saturation of the core using a Litz wire, a gap of 1 mm is formed in the center of the core, .

In the filtration tank, the sponge filter medium 30 is prepared by cultivating a bacterial strain and then washing it, followed by lyophilizing and pulverizing, 4 to 10% by weight of bio-cellulose, and 69 to 82 weight percent of a selected one of polyethylene, polystyrene and polyurethane rubber % And 10 to 25% by weight of shell powder are mixed and made porous.

The pressing plate 20 has a plurality of perforations for discharging the process water flowing downward from the upper portion and includes opening and closing means 22 hinged to one side of the lower perforation so that the sponge filter medium 30 30 are prevented from overflowing.

The pressing plate 20 is connected to a pressing motor 60 which is located at the upper part of the outside of the filtration tank, and is subjected to a pressing process by the pressing motor 60.

The sponge filter medium 30 and the perforated plate 40 provided at the bottom of the filtration tank are provided with hollows having the same diameter as the shaft 62 except for the sponge filter medium 30 and the perforated plate 40 located at the lowermost part .

The sponge filter medium 30 is used for removing electrolytic water contaminated by contaminants in the treated water originally introduced into the filtration tank, electrolyzing the sponge filter media 30 located at the bottom and replacing the spongy filter medium 30, .

As described above, the wastewater treatment system using the electrolysis and sponge filtration apparatus according to the present invention has the following effects.

(1) According to the present invention, a power changing means including a full-bridge converter is installed in an electrolysis tank to stably maintain an output voltage to minimize power consumption, thereby reducing maintenance cost.

(2) According to the present invention, the water treatment effect is improved through the sponge filter material having a plurality of sponges, and the process time is shortened by reducing the time required for the water treatment by pressing the target treated water into the sponge filter material.

(3) In the present invention, bio-cellulose having high absorption and adsorption performance is added to a sponge filter material to enhance the effects of adsorption of organic matter and adsorption of metal.

1 is a flow chart of a wastewater treatment system using an electrolysis and sponge filtration apparatus according to a preferred embodiment of the present invention.
2 is a cross-sectional perspective view of a filtration tank according to a preferred embodiment of the present invention.
3 is a cross-sectional perspective view illustrating an outer frame and a porous plate of a filtration tank according to a preferred embodiment of the present invention.
4 is a perspective view of a compression plate of a filtration tank according to a preferred embodiment of the present invention.

The present invention will be described in detail with reference to the accompanying drawings, in which: FIG. 1 is a perspective view of a sponge filter apparatus according to an embodiment of the present invention; FIG. . In addition, terms defined in the present specification and claims are not to be interpreted as limiting, and may be changed according to the intention or custom of the operator, and should be construed in a meaning and a concept consistent with the technical idea of the present invention.

In one aspect of the present invention,

FIG. 1 is a flow chart of a wastewater treatment system by electrolysis and sponge filtration according to a preferred embodiment of the present invention, FIG. 2 is a perspective view of a cross section of a filtration tank according to a preferred embodiment of the present invention, FIG. 4 is a perspective view of a compression plate of a filtration tank according to a preferred embodiment of the present invention. Referring to FIGS. 1 to 4, .

In a wastewater treatment system,

The wastewater treatment system is composed of a settling tank, an electrolysis tank, a filtration tank and a discharge tank

The settling tank stores wastewater flowing through the screen, deposits sludge by gravity, removes impurities contained in the treated water in an electrolytic bath provided with a full-bridge converter power means, , The filtration tank has a plurality of injection pipes (10) for inflowing and filtering the treated water treated in the electrolysis tank, the outer frame having a rectangular parallelepiped shape, and an upper part for distributing the treated water to the inside of the filtration tank, A sponge filter medium 30 for removing microporous materials in the process water with a porous material and a perforated plate 30 for discharging process water downward when the sponge filter medium 30 is compressed And a discharge pipe 50 for discharging the treated water to the outside of the filtration tank. The compression plate 20, the sponge filter media 30 and the perforated plate 40 are formed in a single layer , Constitutes a plurality of layers within the filtration tank, and stores the treated water discharged from the filtration tank and discharged out of the discharge Joe.

The sedimentation tank is filled with a flocculant mixed with acetic acid, shell powder or coral powder at a weight ratio of 1: 0.1 to 0.9: 0.3 to 0.5, with a selected one of aluminum sulfate and aluminum chloride containing aluminum oxide at a concentration of 7 to 10% .

The shell powder was washed three times with alkaline water having a pH of 7.5 to 9.0 and then baked at 1100 to 1200 ° C. and pulverized to 3 to 8 μm and then surface-treated with an agent to be interfaced to obtain a surface polarity .

Wherein the electrolytic bath comprises an aluminum or iron electrode and the full-bridge power means comprises a converter stage consisting of four diode current stages, two each for each leg, two switches for each leg, and an output filter stage for sending current to the electrodes , The number of transformer turns is 3: 1, 110 ~ 130: 55 ~ 65, and the core uses one of PQ, RM, EFD and EPC, , A gap of 1 mm is formed in the center of the core, and one or more capton tapes are attached to the pores.

Also, since the current increases exponentially according to the voltage applied to the electrode by the full-bridge converter stage, the voltage applied to the electrode is controlled in the initial stage of control, and when the current becomes larger than the command value, It is possible to prevent an excessive current from being generated in the electrode.

In the filtration tank, the sponge filter medium 30 is prepared by cultivating a bacterial strain and then washing it, followed by lyophilizing and pulverizing, 4 to 10% by weight of bio-cellulose, and 69 to 82 weight percent of a selected one of polyethylene, polystyrene and polyurethane rubber % And 10 to 25% by weight of shell powder are mixed and made porous.

The above-mentioned bio-cellulose was cultured for 14 days at 28 to 30 ° C by straining a strain (Acetobacter xvlinum) in a medium containing yeast extract, peptone, Na2HPO4, citric acid and glucose, sterilized by irradiation with gamma rays at 10 to 30 kGy wavelength Freeze-dried, and then pulverized into 200 to 300 mu m.

The pressing plate 20 has a plurality of perforations for discharging the process water flowing downward from the upper portion and includes opening and closing means 22 hinged to one side of the lower perforation so that the sponge filter medium 30 30 are prevented from overflowing.

The compression plate 20 has a space at a position where the compression plate 20 is coupled to the plurality of the opening and closing means 22 in the same shape as the thickness depth of the opening and closing means 22, When the press plate 20 is lifted after the pressing process, the opening / closing means 22 is opened around the hinge axis to be injected into the upper portion of the press plate 20 The treated water is passed downward.

The pressing plate 20 is connected to a pressing motor 60 which is located at the upper part of the outside of the filtration tank, and is subjected to a pressing process by the pressing motor 60.

The sponge filter medium 30 and the perforated plate 40 provided at the bottom of the filtration tank are provided with hollows having the same diameter as the shaft 62 except for the sponge filter medium 30 and the perforated plate 40 located at the lowermost part .

The sponge filter material 30 is removed when it is contaminated by contaminants in the treated water initially introduced into the filtration tank, and the sponge filter materials 30 located below are removed and replaced.

The flow of the treatment water during the water treatment of the filtration tank will be described in detail. The treatment water is injected into the plurality of injection pipes 10 in the electrolysis tank using a dispenser or the like, and a plurality of holes The sponge filter medium 30 is injected into the sponge filter medium 30 through the hollow portion of the compression plate 20 in a wide range and when a certain amount of the process water is injected into the sponge filter medium 30, And the sponge filter medium 30 is pressed by the sponge filter medium 30 to send the treated water downward. The sponge filter medium 30 has a space at the lowermost part thereof with the lowermost perforated plate 40 at the bottom of the filtration tank, The waste water discharged from the sponge filter medium 30 is stored and discharged to the discharge tank.

Experimental Example  1: Escherichia coli experiment of coagulant

In order to carry out an antimicrobial test for the coagulant containing the shell powder, 40 parts by weight of polyaluminum chloride having a concentration of aluminum oxide of 10% and 15 parts by weight of acetic acid having a purity of 70% were mixed and the oyster shell washed three times And 20 parts by weight of crushed powder of 150 mesh was added to the mixture. The mixture was heated at 100 DEG C under a pressure of 100 kgf / cm < 2 >, cooled at 10 DEG C, and a coagulant prepared by adding a conventional flocculant ) Was used as a comparative group, and the prepared coagulant of the present invention and a comparative group coagulant were added thereto using an inoculated Escherichia coli ATCC 25922 (initial concentration: 4.5 x 10 ^ 4 CFU / ml) After the coagulation reaction, the results are shown in Table 1 below.

Test Items Test result Initial concentration (CFU / ml) Concentration after 24 hours
(CFU / ml) Bacterial reduction rate (%)
By E. coli
Antibacterial test
Invention
Coagulant 4.5 x 10 ^ 4 4.5 x 10 ^ 2 50.1 Normally
Coagulant 4.5 x 10 ^ 4 4.5 x 10 ^ 2 50.3

As shown in Table 1, the bacterial reduction rate of the conventional coagulant and the coagulant of the present invention was about 50%. The amount of aluminum used as a main raw material of the flocculant is small, so that the flocculant of the present invention is small. Therefore, the amount of aluminum used can be reduced due to the flocculant of the present invention, thereby preventing secondary contamination due to the aluminum flocculant, Can reduce ecosystem breakdown and release of toxic buildup.

Test Example  2: Sewage treatment by the sewage treatment system of the present invention

In the wastewater treatment system using the electrolysis and sponge filtration apparatus according to the present invention, wastewater collected from the sewage end treatment plant of Gwangju Metropolitan City is introduced and stored in a sedimentation tank. Then, coagulant is added to sediment the sludge, Electrolysis was carried out in a decomposition tank, the solution was injected into a filtration tank, passed through a sponge filter medium 30 and discharged into a discharge tank to measure COD, BOD, n-Hexan and turbidity.

division COD BOD n-hexane Turbidity Raw water source 2598.5 3919.6 49 1.297 Treated water 5.1 2.3 3.2 0.261

Table 2 shows that more than 90% of COD, BOD, and n-hexane were removed, and the turbidity was clarified by more than 80%. In the same way as in the sedimentation tank after storage in the discharge tank, the coagulant and gravity- It was expected that tea sedimentation would be more effective.

In a further aspect,

The material constituting the outer frame of the settling tank, electrolytic tank, filtration tank and discharge tank of the wastewater treatment system of the present invention may be a mixture of general synthetic resin and shell powder, and a shaft 62 And the perforated plate 40 are made of stainless steel so as to give rigidity.

The sludge generated in the sedimentation tank may be stored in a recovery tank, and the stored sludge and hydrochloric acid having a concentration of 10% may be supplied at a 1: 2 ratio for 1 to 2 hours And 5% of Al ₂ O ₃ can be recovered and reused in the coagulant under pH 2.

Also, the pressing process of the filtration tank is performed by a specified amount of the treatment water injected into the filtration tank or by placing a weighing device between the perforated plate 40 and the filtration sponge to inject a certain amount of treatment water into the sponge filtering material 30, And a structure (not shown) capable of opening and closing the inlet so that the sponge filter element 30 can be inserted into or removed from the inside of the filtration tank can be provided on the outer surface side of the filtration tank.

As described above, the following effects of the electrolysis and sponge filtration system according to the present invention are that the power changing means including the full-bridge converter is installed in the electrolysis tank to stably maintain the output voltage, So that the water treatment effect is enhanced through the plurality of sponge filter materials 30 and the process time is shortened by pressing when the target treatment water is injected into the sponge filter material 30, And the sponge filter medium 30 is improved in the effect of adsorption of organic matter and adsorption of metal by adding bio-cellulose having high absorption and adsorption performance.

While the present invention has been described in connection with certain exemplary embodiments and drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various modifications and variations are possible.

10: Injection tube 40: Perforated plate
20: compression plate 50: discharge pipe
22: opening / closing means 60:
30: sponge filter medium 62: shaft

Claims (8)

In a wastewater treatment system,
The wastewater treatment system is composed of a settling tank, an electrolysis tank, a filtration tank and a discharge tank
The settling tank stores wastewater flowing through the screen, sedimentes sludge by gravity,
The treated water treated in the settling tank is removed from the electrolytic bath equipped with the full-bridge converter power means to remove the impurities contained in the treated water,
Wherein the filtration tank has a plurality of injection pipes for introducing treated water treated in the electrolytic bath and filtering the water, wherein the outer frame has a rectangular parallelepiped shape and the upper part is for distributing the treated water to the inside of the filtration tank, A sponge filter medium for removing fine suspended particles in the treatment water by using a porous material, a perforated plate for discharging treated water downward when the sponge filter medium is compressed, and a discharge pipe for discharging the filtered treatment water to the outside of the filtration tank,
Wherein the pressure plate, the sponge filter material, and the perforated plate are formed in a single layer,
The discharge tank stores the treated water discharged from the filtration tank and discharges the treated water to the outside,
In the filtration tank, the sponge filter medium is prepared by culturing a bacterial strain, washing it, lyophilizing and then pulverizing it to obtain 4 to 10% by weight of bio-cellulose, 69 to 82% by weight of a selected one of polyethylene, polystyrene and polyurethane rubber, 10 to 25% by weight of shell powder are mixed and made porous,
The pressing plate is connected to a pressing motor which is located at the upper part of the outside of the filtration tank, and a pressing process is performed by a pressing motor.
Wherein the sponge filter medium and the perforated plate provided in the filtration tank are provided with a hollow having the same diameter as the shaft except for the sponge filter medium and the perforated plate located at the lowermost part. . The method according to claim 1,
The sedimentation tank is filled with a flocculant mixed with acetic acid, shell powder or coral reef powder in a weight ratio of 1: 0.1 to 0.9: 0.3 to 0.5, selected from aluminum sulfate and aluminum chloride containing aluminum oxide at a concentration of 7 to 10% Wherein the sponge filter is disposed in the vicinity of the sponge. The method according to claim 1,
Wherein the electrolytic bath comprises an aluminum or iron electrode and the full-bridge power means comprises a converter stage consisting of four diode current stages and four switches, two for each leg, and an output filter stage for sending current to the electrodes, : 1, and one of PQ, RM, EFD, and EPC is used as a core. In order to prevent saturation of the core using a Litz wire, a gap of 1 mm is formed in the center of the core, And the electrolytic water and the sponge filtration apparatus. delete The method according to claim 1,
The press plate has a plurality of perforations for discharging the process water flowing downward from the upper portion and includes opening and closing means connected to the lower side of the perforation by a hinge so that the process water discharged from the sponge filter material during the compression of the sponge filter material flows Wherein the sponge filtration system comprises: delete delete The method according to claim 1,
Wherein the sponge filter medium is removed when it is contaminated by contaminants in the treated water initially introduced into the filtration tank, and the sponge filter media located downward are moved upward to replace the waste water.

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