KR101750442B1 - Sewage advanced treatment system using ultrasonic device - Google Patents

Abstract

The present invention relates to an advanced treatment system for treating wastewater using an ultrasonic apparatus, and more particularly, to an advanced treatment system for treating wastewater by using an ultrasonic apparatus, more specifically, a wastewater treatment apparatus, (NO ₃ ) is denitrified with nitrogen (N ₂ ) gas by introducing treated water, treating anaerobic tank treated with phosphorus (PO ₄ ^-3 ) phosphorus (P) Anoxic tank, treated with phosphorus, phosphorus is phosphoric acid again, nitrite nitrogen is oxidized to nitrate nitrogen, then transported back to anoxic tank, denitrification process to remove nitrogen gas, and anaerobic tank, anoxic tank and aerobic tank The treated water discharged from the treatment process is introduced into the low-frequency ultrasonic wave part, and ultrasonic waves are applied to the treated water. The ultrasonic wave is discharged to the high-frequency ultrasonic wave part, And the chromaticity is removed. The ultrasonic wave is injected into the low frequency ultrasonic wave part and the high frequency ultrasonic wave part during the ultrasonic wave processing, and the air is injected through the air injection tube (not shown) And a second settling tank for removing final sludge from the sludge and removing the coagulant from the sludge and discharging the sludge from the treated sludge after final removal, The low efficiency of nitrogen removal due to the low C / N ratio generated in the A ² / O process, which is the sewage treatment process applied in Korea, is further denitrified by using ultrasonic waves, so that the denitrification effect is high and the sewage containing sludge Ultrasonic waves are irradiated, but denitrification effect and sludge amount reduction effect are enhanced by intensive irradiation of sewage at certain facilities. Sludge and contaminants with high particle size that are not decomposed by sediment are precipitated on the precipitation plate of ultrasonic device and the sludge treatment efficiency is high and the coagulant is added to filtration tank and secondary precipitation tank as well as advanced treatment (A ² / O) The purification efficiency of the treated sewage discharged is high.

Description

[0001] The present invention relates to an advanced treatment system for sewage,

The present invention relates to an advanced treatment system for treating wastewater using an ultrasonic apparatus, and more particularly, to an advanced treatment system for treating wastewater by using an ultrasonic apparatus, more specifically, a wastewater treatment apparatus, (NO ₃ ) is denitrified with nitrogen (N ₂ ) gas by introducing treated water, treating anaerobic tank treated with phosphorus (PO ₄ ^-3 ) phosphorus (P) Anoxic tank, treated with phosphorus, phosphorus is phosphoric acid again, nitrite nitrogen is oxidized to nitrate nitrogen, then transported back to anoxic tank, denitrification process to remove nitrogen gas, and anaerobic tank, anoxic tank and aerobic tank The treated water discharged from the treatment process is introduced into the low-frequency ultrasonic wave part, and ultrasonic waves are applied to the treated water. The ultrasonic wave is discharged to the high-frequency ultrasonic wave part, And the chromaticity is removed. The ultrasonic wave is injected into the low frequency ultrasonic wave part and the high frequency ultrasonic wave part during the ultrasonic wave processing, and the air is injected through the air injection tube (not shown) A filtration tank for introducing the treated water discharged from the tank to filter the sludge and contaminants composed of fine particles and discharging the treated sludge and the sludge in the treatment water to remove the sludge by ultimate sedimentation, The present invention relates to an advanced treatment system for sewage water using sewage water.

Although the amount of sewage generated by water pollution increases every year due to industrial development, population increase, and improvement of living standard, the sewage is not properly maintained and the sewage water treatment facility has a capacity shortage, The amount of sewage water is estimated to be considerably low, and the amount of sewage water is closely related to the amount of water supply. The quality of sewage water quality is closely related to the level of living.

In recent years, eutrophication-causing substances such as nitrogen and phosphorus contained in sewage are discharged to rivers, causing serious environmental problems such as destruction of ecological balance not only in the urban area but also in the urban area.

Most of the sewage treatment plants operated in Korea are applying the foreign construction method that does not have special treatment facilities to remove nutrients and the treatment of sewage in Korea with low BOD concentration Since most of the sewage treatment plants are designed with emphasis on organic matter removal, the removal of organic matter and the nitrification of the water quality are likely to be released, which is likely to cause bird waters.

Since the ratio of the organic matter to nitrogen (C / N ratio) of the influent water flowing into the sewage treatment plants in Korea is as low as 6 or less, it is difficult to apply and operate the biological nitrogen and phosphorus removal process. In order to improve the nitrogen removal efficiency It is necessary to supplement organic carbon sources. In general, methanol, ethanol, acetic acid, and the like have been proposed as external carbon sources for facilitating biological denitrification and de-phosphorusing of sewage, and recently, materials such as acetic acid produced in the anaerobic fermentation process are easily decomposed COD can be used as a carbon source in the biological denitrification process to improve the nitrogen removal efficiency.

However, since the denitrification process requires a new apparatus for sludge fermentation and the production of fermentation products is performed by microorganisms, it takes a long time and is not easy to operate. Therefore, It is necessary to develop a device capable of supplying organic material in a simple and stable manner.

In recent years, processes for treating degradation wastewater using ultrasound have been developed. In the case of a chemical reaction using ultrasonic irradiation, the reaction conditions are not rigid, the reaction rate is easily controlled, and the induction time in the exothermic reaction is very short , It has the advantage of using lower grade reagents than conventional techniques.

In addition, the sewage treatment method using ultrasonic waves has the potential to be usefully utilized as a technology for treating wastewater, waste, and waste gas, as well as technologies using ozone oxidation, ultraviolet rays, photocatalyst, radiation, electron beam, electromagnetic wave or plasma.

Prior art of the sewage treatment facility using ultrasound is Korean Patent No. 10-0457465 (November 26, 2004). The sewage treatment apparatus using ultrasound is used to disperse, precipitate, sediment, The present invention relates to a sewage treatment apparatus using ultrasonic waves capable of suppressing, coagulating, and polymerizing sewage so as to purify sewage. The apparatus includes an ultrasonic wave generating unit composed of a constant voltage generator, a power input regulator, a timer, and an ultrasonic generator, A sewage treatment tank in which the ultrasonic oscillation portion is arranged in a radial manner on the upper portion, a multi-stage sewage stabilization tank connected in series to precipitate minute foreign substances, a sediment discharged from the sewage treatment tank and the sewage treatment tank is compressed and dehydrated, A sediment compression tank and a water quality inspection tank, And an ultrasonic wastewater treatment unit having an upper part provided with a catalytic member and a lower part provided below the upper part and provided with an ultrasonic wave processing part for generating ultrasonic waves, The catalytic member is provided with titanium dioxide which chemically reacts with hydroxyl radicals generated by ultrasonic waves to enhance the decomposition efficiency of contaminants. The ultrasonic wave processing unit is provided with two ultrasonic generators, which are inclined so as to face each other, Thereby providing a sewage purifying apparatus.

However, the ultrasonic apparatuses of the prior arts have a problem in that they are expensive to be installed in a conventional wastewater treatment facility, have a complicated structure, and have an additional composition such as a catalyst member And the effect is high when the sludge is directly irradiated to a sludge settled in a facility such as a large-sized storage tank. Thus, there is a problem that it is unclear whether it is suitable for a conventional advanced treatment facility.

Korean Patent No. 10-0457465 (November 26, 2004) Korean Registered Patent No. 10-1178086 (2012.09.06.)

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 method of treating biological wastewater, Ultrasonic waves are applied to the sewage, and the momentary pressure, shear force, and high temperature in the process of microbubble infiltration by cavitation are used as an energy source to physically and chemically change the contaminants. In order to improve the denitrification effect during the irradiation and to reduce the amount of the sludge in the treated sewage, a process of intensively irradiating ultrasonic waves to the sewage containing the sludge is performed, and further, Of the present invention.

In order to solve the above problems and to achieve the object, an advanced treatment system for sewage using an ultrasonic apparatus according to an embodiment of the present invention includes a primary settling tank 10, an anaerobic tank 20, an anoxic tank 30, The first settling tank 10 is constructed of an ultrasonic tank 50, a filtration tank 80 and a second settling tank 90. In the first settling tank 10, sludge having a large particle size is introduced into the sewage treated by the screening facility, (PO ₄ ^-3 ) is treated with phosphorus (P), and the phosphorus acid (PO ₄ ^-3 ) is treated with phosphorus The anoxic tank 30 receives treated water discharged from the anaerobic tank 20 to denitrify nitrate nitrogen (NO ₃ ) by nitrogen (N ₂ ) gas and discharge the nitrate nitrogen, and the oxic tank 40 discharges nitrate The phosphorus is again phosphorus acid, nitrite nitrogen is oxidized to nitrate nitrogen, The ultrasound tank 50 is treated in an advanced treatment process including an anaerobic tank 20, an anoxic tank 30 and an oxic tank 40, and discharged therefrom. The process water is introduced into the low frequency ultrasound unit 60 to apply ultrasound waves to the ultrasound ultrasound unit 70. The ultrasound waves are applied to the high frequency ultrasound unit 70 to remove denitrification and chromaticity by applying ultrasound waves, And the air is injected through an air injection pipe (not shown). The filtration tank 80 is filled with a filter medium and waste concrete, and the ultrasound tank 50 is connected to the high- And the sludge and contaminants composed of fine particles are filtered and discharged. The sludge in the treatment water discharged from the filtration tank (80) is finally settled by the secondary settling tank (90) to remove the coagulant So Remove and discard.

A low frequency ultrasonic wave section 60 is provided on one side surface of the high frequency ultrasonic wave section 70 and a partition plate 64 is provided between the plurality of the precipitation plates 62 and the precipitation plate 62 Is installed.

The partition plate 64 is installed between the settling plates 62, and the settling plates 62 are installed in the same direction as the settling plates 62, 62 and the partition plate 64 are provided with a plurality of hollows through which the process water passes.

A plurality of low frequency ultrasonic wave irradiating means 66 are attached to the outer surface of the settling plates 62 provided next to the partition plate 64 to apply ultrasonic waves to the treated water for 120 minutes at an acoustic frequency of 40 kHz and an output of 600 W, (70).

A plurality of high frequency ultrasonic wave irradiating means 72 protrude inward at the lower end of the high frequency ultrasonic wave section 70 of the ultrasonic wave tank 50. When the amount of the processing water flowing in from the low frequency ultrasonic wave section 60 reaches a specified quantity, The ultrasonic wave is applied to the process water at a frequency of 158 kHz and the output is 600 W for 120 minutes, and then discharged to the filtration tank 80.

The filtration tank 80 is filled with a filter medium and waste concrete, and the treated water discharged from the ultrasonic tank 50 is filtered. The filter medium is washed and dried, and powdered calcium powder, polyethylene, poly The mixture is mixed with a selected one of propylene, polyurethane, silicone rubber and polyurethane rubber in a weight ratio of 1: 1 to 1.5 in a spherical form and heated. The prepared filter material is washed with distilled water, And the waste concrete produced by heating for 5 hours is filled in the filtration tank 80 at a volume ratio of 5: 5.

30 to 70 parts by weight of aluminum oxide (Al2O3) having a concentration of 30 to 55%, 30 to 40 parts by weight of limestone and 15 to 30 parts by weight of activated silica powder are mixed and then the sodium oxide (Na2O) 10 to 30 parts by weight of caustic soda (40 to 40%) and 30 to 50 parts by weight of Mg-sericite (magnesium-sericite) are mixed and reacted at 100 to 200 ° C for 5 to 10 hours, followed by cooling. A sludge advanced treatment system using an ultrasonic device for flocculating suspended particles is provided.

As described above, the advanced treatment system for sewage using the ultrasonic apparatus according to the present invention has the following effects.

(1) The present invention has a high denitrification effect due to the additional denitrification using ultrasonic waves due to the low C / N ratio resulting from the A ² / O process, which is a sewage treatment process applied in Korea.

(2) According to the present invention, the ultrasonic wave is irradiated to the sewage containing sludge, the denitrification effect and the reduction effect of the sludge amount are high by concentrating the sewage at a certain facility, and the sludge and the pollutant, The sludge treatment efficiency is high due to sedimentation on the apparatus precipitation plate.

(3) The present invention has high purification efficiency of treated wastewater discharged by injecting coagulant into filtration tank and secondary settling tank as well as advanced treatment (A ² / O) and ultrasonic device.

1 is a flow chart of an advanced sewage treatment system using an ultrasonic apparatus according to a preferred embodiment of the present invention.
2 is an exploded perspective view of a low frequency ultrasound unit according to a preferred embodiment of the present invention.
3 is a side view showing a sedimentation plate and a partition plate of a low frequency ultrasonic unit according to a preferred embodiment of the present invention.
4 is a partially enlarged view of a sedimentation plate and a partition plate of a low frequency ultrasonic unit according to a preferred embodiment of the present invention.
5 is a cross-sectional view of an ultrasonic bath according to a preferred embodiment of the present invention.

The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. 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 an advanced treatment system for sewage using an ultrasonic device according to a preferred embodiment of the present invention, FIG. 2 is an exploded perspective view of a low-frequency ultrasonic part according to a preferred embodiment of the present invention, 1 is a side view showing a sedimentation plate and a partition plate of a low-frequency ultrasonic section according to a preferred embodiment of the present invention.

An advanced treatment system for treating wastewater using an ultrasonic device,

The advanced treatment system is composed of a primary settling tank 10, an anaerobic tank 20, an anoxic tank 30, an aerobic tank 40, an ultrasonic tank 50, a filtration tank 80 and a secondary settler 90,

In the primary settling tank 10, sludge having a large particle size is introduced into the sewage treated by the screening facility, the sludge is settled by gravity,

In the anaerobic tank 20, the treated water discharged from the primary settling tank 10 is introduced to treat phosphorus acid (PO ₄ ^-3 ) as phosphorus (P)

The anoxic tank 30 introduces treated water discharged from the anaerobic tank 20 to denitrify nitrate nitrogen (NO ₃ ) with nitrogen (N ₂ )

In the aerobic tank 40, the treated water discharged from the anoxic tank 30 flows into the anaerobic tank 30, phosphorus is again phosphoric acid, the nitrite nitrogen is oxidized to nitrate nitrogen, and then the nitrate nitrogen is internally transported to the anoxic tank 30. Therefore,

The ultrasonic bath 50 is processed in an advanced treatment process including an anaerobic tank 20, an anoxic tank 30 and an oxic tank 40 and flows the treated water discharged into the low frequency ultrasound unit 60 to apply ultrasonic waves, (50), the oxidant is introduced into the low-frequency ultrasonic wave unit (60) and the high-frequency ultrasonic wave unit (70), and the air is injected into the air- The air is injected through the air inlet,

The filtration tank 80 is filled with a filter medium and waste concrete. Filtration water discharged from the ultrasound tank 50 flows into the filtration tank 80 to filter and discharge sludge and contaminants composed of fine particles.

The sludge in the treatment water discharged from the filtration tank 80 is finally settled by the secondary settling tank 90, but the flocculant is removed and then discharged to the water system.

The oxidizing agent to be fed into the ultrasonic bath 50 can be replaced by ferrous chloride (FeCl ₂ ), hydrogen peroxide (H ₂ O ₂ ), ferrous chloride and hydrogen peroxide And the ratio of H ₂ O ₂ / FeCl ₂ is set to 0.4.

When the ratio of H ₂ O ₂ / FeCl ₂ is 0.4, the removal efficiency of COD and chromaticity is 50% for low-frequency ultrasound and 54% for high-frequency ultrasound, but the removal efficiency tends to decrease when the ratio is 0.5 to 0.6. .

Meanwhile, the injection concentration of the ferrous chloride (FeCl ₂ ) is preferably 400 to 1000 ppm.

The air inlet tube (not shown) may be fixed to the side or bottom of the low-frequency ultrasonic wave unit 60 and the high-frequency ultrasonic wave unit 70.

A low frequency ultrasonic wave section 60 is installed on one side of the high frequency ultrasonic wave section 70 and a partition plate is provided between the plural settling plates 62 and the settling plate 62 in the ultrasonic wave tank 50.

The partition plate 64 is installed between the settling plates 62, and the settling plates 62 are installed in the same direction as the settling plates 62, 62 and the partition plate 64 are provided with a plurality of hollows through which the process water passes.

A plurality of low frequency ultrasonic wave irradiating means 66 are attached to the outer surface of the settling plates 62 provided next to the partition plate 64 to apply ultrasonic waves to the treated water for 120 minutes at an acoustic frequency of 40 kHz and an output of 600 W, (70).

A plurality of high frequency ultrasonic wave irradiating means 72 protrude inward at the inner lower end of the high frequency ultrasonic wave section 70 of the ultrasonic wave tank 50. When the number of the processing water flowing in from the low frequency ultrasonic wave section 70 reaches a specified quantity, The ultrasonic wave is applied to the process water at a frequency of 158 kHz and the output is 600 W for 120 minutes, and then discharged to the filtration tank 80.

FIG. 4 is a partially enlarged view of a sedimentation plate and a partition plate of a low-frequency ultrasound unit according to a preferred embodiment of the present invention, FIG. 5 is a cross-sectional view of an ultrasound system according to a preferred embodiment of the present invention, Will be described in more detail below.

In the movement of the treated water in the low frequency ultrasonic wave section 60, the treated water flowing into the low frequency ultrasonic wave section 60 through the pump flows through the hollow of the initial settler plate 62, and the sludge having a large mass or volume The treated water containing fine particles flows over the sedimentation plate 62 and is discharged to the sedimentation plate 62 provided in the vertical direction through the hollow of the partitioning plate 64. At this time, The ultrasonic wave is irradiated to the process water flowing over the hollow through the hollow of the partition plate 64 by the low frequency ultrasonic wave irradiating means 66 attached to the outer surface of the partition plate 64 and discharged to the high frequency ultrasonic wave portion 70 through the hollow , The ultrasonic wave process is repeated by repeating the above procedure to improve the sewage treatment efficiency by the ultrasonic wave.

The filtration tank 80 is filled with a filter medium and waste concrete, and the treated water discharged from the ultrasonic tank 50 is filtered. The filter medium is washed and dried, and powdered calcium powder, polyethylene, poly The mixture is mixed with a selected one of propylene, polyurethane, silicone rubber and polyurethane rubber in a weight ratio of 1: 1 to 1.5 in a spherical form and heated. The prepared filter material is washed with distilled water, And the waste concrete produced by heating for 5 hours is filled in the filtration tank 80 at a volume ratio of 5: 5.

30 to 70 parts by weight of aluminum oxide (Al2O3) having a concentration of 30 to 55%, 30 to 40 parts by weight of limestone and 15 to 30 parts by weight of activated silica powder are mixed and then the sodium oxide (Na2O) 10 to 30 parts by weight of caustic soda (40 to 40%) and 30 to 50 parts by weight of Mg-sericite (magnesium-sericite) are mixed and reacted at 100 to 200 ° C for 5 to 10 hours, followed by cooling. Floating particles are agglomerated.

Experimental Example  1: Reduction effect of oxidant injection concentration and ultrasonic output of low frequency and high frequency ultrasonic wave

The reaction tank was made of SUS material with an inner diameter of 300 mm. The acoustic frequency was 40 kHz at low frequency and 158 kHz at high frequency. Wastewater generated from the dyeing process was used as dyeing wastewater. And the output of high frequency was 600watt. The oxidizing agent concentration was changed to 200, 400, 600, 800 and 1000ppm, and the chromaticity removal rate was observed with time. An air diffuser was installed and the air supply was constantly supplied to the flow meter.

Table 1 shows the chromaticity removal efficiency at low frequency ultrasound (40 kHz) and Table 2 shows the chromaticity removal efficiency at high frequency (158 kHz).

The removal efficiencies of chromaticity were 75% at 120 min after the injection of ferrous chloride (FeCl ₂ ) at low frequency, and 82% when 200 ppm FeCl ₂ was injected , 86% at 400 ppm, 88% at 600 ppm, 89% at 800 ppm, and 91% at 1000 ppm.

At the high frequency, when the ferrous chloride (FeCl ₂ ) was not injected, the chromaticity removal efficiency was 80% after 120 minutes of irradiation, but 85% when 200 ppm of FeCl ₂ was injected, 87% when 400 ppm, %, The color removal efficiency was 93% at 800 ppm and 95% at 1000 ppm.

Experimental Example  2: COD, NH due to optimal conditions of low frequency and high frequency ultrasonic ₃  Removal efficiency

The reaction tank was made of SUS material with an inner diameter of 300 mm. The acoustic frequency was 40 kHz at a low frequency and 158 kHz at a high frequency. The treated wastewater was treated with wastewater generated from the dyeing process of the H satin towel and yarn, , And the NH ₃ -N was 64 ppm. The output of low frequency and high frequency was set to 600 watt, and the change rate with time was observed.

Table 3 shows the removal efficiencies for low frequency ultrasound (40 kHz) and Table 4 shows the removal efficiencies for high frequency (158 kHz).

In the COD removal efficiency, the removal efficiency was 58% at 120 minutes for the low frequency and 68% for 120 minutes at the high frequency. The removal efficiency of NH ₃ was 82% at low frequency and 91% at high frequency.

The sewage advanced treatment system using the ultrasonic device according to the present invention can be applied to the low efficiency of nitrogen removal due to the low C / N ratio generated in the A ² / O process, which is a sewage treatment process applied in Korea, Since the denitrification is performed, the denitrification effect is high, and the ultrasonic wave is irradiated to the sewage containing the sludge, the denitrification effect and the sludge amount reduction effect are enhanced by the concentrated irradiation of the sewage at certain facilities, and the sludge and contamination The material is precipitated on the precipitation plate of the ultrasonic device and the efficiency of the sludge treatment is high. The purification efficiency of the final discharged sewage is high by putting the coagulant into the filtration tank and the secondary settling tank as well as the advanced treatment (A ² / O) and the ultrasonic device.

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: primary sedimentation tank 64: partition plate
20: anaerobic tank 66: low frequency ultrasonic wave irradiation means
30: Anoxic tank 70: High frequency ultrasonic wave part
40: aerobic tank 72: high frequency ultrasonic wave irradiation means
50: ultrasonic bath 80: filtration tank
60: Low frequency ultrasonic section 90: Secondary settling tank
62: Precipitation plate

Claims (7)

An advanced treatment system for treating wastewater using an ultrasonic device,
The advanced treatment system includes a primary settling tank, an anaerobic tank, an anoxic tank, an aerobic tank, an ultrasonic tank, a filtration tank, and a secondary settler,
In the primary settling tank, sludge having a large particle size flows into the sewage treated by the screening facility, sludge is settled by gravity,
In the anaerobic tank, the treated water discharged from the primary settling tank is introduced to treat phosphorus acid (PO ₄ ^-3 ) with phosphorus (P)
In the anoxic tank, treated water discharged from an anaerobic tank is introduced to denitrify nitrate nitrogen (NO ₃ ) by nitrogen (N ₂ ) gas,
In the aerobic tank, the treated water discharged from the anoxic tank flows in, phosphorus is again phosphoric acid, nitrite nitrogen is oxidized to nitrate nitrogen, and then is internally transported to an anoxic tank,
The ultrasonic wave is processed in an advanced treatment process consisting of an anaerobic tank, anoxic tank and aerobic tank, and the treated water discharged into the low frequency ultrasound unit is introduced into the low frequency ultrasound unit, and the ultrasound waves are discharged to the high frequency ultrasound unit to remove the denitrification and chromaticity by applying ultrasonic waves. In the process, an oxidant is injected into the low-frequency ultrasonic wave portion and the high-frequency ultrasonic wave portion, air is injected through an air injection tube (not shown)
The filtration tank is filled with a filter medium, and the treated water discharged from the ultrasonic tank is introduced to filter the sludge and contaminants composed of fine particles,
The sludge in the treatment water discharged from the filtration tank is finally settled by the secondary settling tank,
In the ultrasonic bath, the low-frequency ultrasonic wave part is installed on one side of the high-frequency ultrasonic wave part, and a partition plate is installed between a plurality of the precipitation plate and the precipitation plate,
The sedimentation plate is formed in a shape of a saw-tooth when viewed from the side. The sedimentation plate and the partition plate are provided with a plurality of hollows through which the treated water is passed, Respectively,
The filtration tank is filled with a filter medium and a waste concrete, and the treated water discharged from the ultrasonic tank is filtered. The filter medium is washed and dried, and then powdered calcium powder and a mixture of polyethylene, polypropylene and polyurethane rubber And the mixture is mixed with the selected one in a weight ratio of 1: 1 to 1.5, and then heated. The prepared filter material is washed with distilled water and then heated to 100 to 500 ° C. for 12 hours, 5: 5 < / RTI >
The oxidizing agent to be added to the ultrasonic bath may be selected from ferric chloride (FeCl ₂ ), hydrogen peroxide (H ₂ O ₂ ), ferric chloride and hydrogen peroxide. And the ratio of H ₂ O ₂ / FeCl ₂ is 0.4. delete delete The method according to claim 1,
A plurality of low frequency ultrasonic wave irradiating means are attached to the outer surface of the settable plates provided next to the partition plate so that ultrasonic waves are applied to the treated water for 120 minutes at an acoustic frequency of 40 kHz and an output of 600 W for release to the inside of the high frequency ultrasonic wave unit Sewage advanced treatment system using device. The method according to claim 1,
The high frequency ultrasonic wave portion of the ultrasonic wave tank has a plurality of high frequency ultrasonic wave irradiation means protruded inward at an inner lower end thereof. When the number of the processing water introduced from the low frequency ultrasonic wave portion reaches the designated water volume, the ultrasonic wave is processed for 120 minutes at an acoustic frequency of 158 kHz and an output of 600 W And then discharged through a filtration tank. ≪ IMAGE > delete The method according to claim 1,
30 to 70 parts by weight of aluminum oxide (Al2O3) having a concentration of 30 to 55%, 30 to 40 parts by weight of limestone and 15 to 30 parts by weight of activated silica powder are mixed and then the sodium oxide (Na2O) 10 to 30 parts by weight of caustic soda (40 to 40%) and 30 to 50 parts by weight of Mg-sericite (magnesium-sericite) are mixed and reacted at 100 to 200 ° C for 5 to 10 hours, followed by cooling. Characterized in that the suspended particles are agglomerated.

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