KR100989213B1 - Advanced treatment flotation method by dissolved nano air bubble water that do not need reaction, coagulation, neutralization tank (naf method) - Google Patents

Abstract

PURPOSE: An advanced treatment flotation method by dissolved a nano air bubble water that do not need reaction, coagulation, neutralization tank(NAF method) is provided to easily remove biologically recalcitrant substance, total nitrogen, total phosphorus. CONSTITUTION: A pressure pump(20) circulates processed water of a floating tank. A chemical injection pump discharges chemical from a chemical tank(52). A nano air bubble generator(100) expands and compress circulating water of an injector and supplies nano bubble to the inflowing water inlet of a division tank. A controller automatically control circulating water quantity, injected chemical quantity, and the level of the division tank and sludge rate.

Description

Advanced treatment flotation method by dissolved nano air bubble water that do not need reaction, coagulation, neutralization tank (NAF method)}

The present invention relates to a flotation separation apparatus and method for providing a low cost of facilities and a simple treatment device and process by combining advanced treatment (T-N, T-P removal) and sludge thickening equipment in sewage / wastewater generated in the sewage / wastewater treatment plant.

Advanced sewage / wastewater treatment (T-N, T-P removal) includes biological treatment, flocculation and sedimentation.

Among them, AO, A ₂ O, VIP, UCT, Bardenpho, SBR, NBR, Five Stage, etc. have been developed and used as biological treatment methods, but the limits of biological treatment (TN: 20mg / ℓ, TP: 1mg / less than or equal to ℓ), and the lumps of microorganisms in the Pin Floc state contain phosphorus (P), which is a component of the nucleus of the microorganisms, and soluble phosphorus (P) remains. Chemical treatment is indispensable for this. As such, biological treatment methods require sewage / wastewater to be reused by various processes such as filtration facilities and adsorption facilities, and thus require a wide treatment site and a long treatment time.

In the flocculation sedimentation method, various auxiliary facilities such as a reaction tank, a flocculation tank, a flocculation sedimentation tank, a sludge concentration tank, etc. are required, and the residence treatment time also takes 3 hours or more to precipitate and separate the formed floc.

In addition, examples of the flotation separation method for lifting and removing solids contained in the sewage / wastewater are known from Republic of Korea Patent Application Publication No. 2000-37345 and Utility Model No. 20-0252229. As it is formed into a large floc through the flocculation tank and the neutralization tank, a large amount of space is also required for installation, and it takes a long time for the chemical to penetrate into the solid to form the floc by the chemicals injected into the flocculation tank. In this case, the inflow water takes a long time because at least one hour is required to pass through the final flotation tank.

In addition, if the pressurized water tank (3 minutes residence time) required to supply bubbles to the flotation tank in the normal flotation separation method is more than 3kg / ㎠, regular inspection is required with two kinds of pressure vessels, which is cumbersome for maintenance. There was this.

Moreover, in the case of general pressure flotation method, the flocs are attached to the surface of the large flocs formed in the reaction and flocculation tanks, so that the flocs must be floated. Therefore, the flocs must be large. If it takes 3 minutes, the separation time is 30 minutes or more, so the total travel time was longer than 1 hour.

The present invention has been invented to solve the above problems, by using a nano-sized micro-bubbles (Nano Air Bubble number, diameter 50nm or less) to separate the inlet water to the Pin-Floc and Colloid state of a large floc is required Therefore, it is an object of the present invention to provide a flotation separation apparatus and method for shortening the treatment time while reducing the type and amount of chemicals and preventing the conventional reaction tank, the neutralization tank, the flocculation tank, and the like.

Features of the present invention for achieving the above object, in the flotation separation device for floating the floc formed in the inflow water introduced into the inflow water inlet to remove the skimmer by the advanced treatment and discharge the treated water to the outlet, the above-mentioned flotation separation A pressurized pump connected to the outlet side bottom of the tank by a pipe to circulate the treated water of the floating separation tank to the circulation water; Air compressors; A chemical infusion pump for discharging a chemical required for the influent treatment from the chemical tank according to a component of the influent; The pressurization pump is connected to the inlet side of the hollow portion which has an inner diameter narrowed from the inlet and widened to the outlet side, and a chemical inlet and an air inlet connected to the end of the portion where the inner diameter is narrowed through an air compressor, a chemical injection pump and a pipe line. Perforated injectors; Nano-bubble water generator for producing the nano-bubble water by repeating the expansion and compression of the circulating water discharged from the injector by the medicine and air is supplied to the inlet water inlet side of the flotation tank; Control unit to automatically control the operation of each part constituting the flotation separator through PLC programming to automatically control the water level and sludge water content of the flotation tank by the circulating water, the amount of injected chemicals and the treatment level according to the inflow water ( MCC); It is configured to include a conventional separation vessel, the flocculation tank, the neutralization tank is not necessary, and the floating separation device to complete the advanced treatment of the influent in one tank.

In the above-mentioned floatation separation tank, at least one partition wall lower than the appropriate water level inside the floating separation tank is formed at the front lower portion of the inflow water inlet, and the scum reservoir is installed at the treated water outlet side so that its outer peripheral surface is spaced apart from the inner peripheral surface of the floating separation tank. Due to the installation of the reservoir, the treatment tank is automatically formed so that only the treatment water is stored between the treatment water outlet and the scum storage tank.

In addition, the nano-bubble generating device is formed of a U-shaped, the center is connected to the outlet of the injector, has a wider inner diameter than the outlet of the injector and the first blocking plate is formed on one side connected to the injector to limit the flow of circulating water in one direction only A plurality of pressurized tubes connecting the both sides of the first expansion tube to the first expansion tube and having a smaller inner diameter than the first expansion tube to pressurize (shrink) the circulating water; A plurality of blocking plates for forming and blocking a flow path for circulating water to pass through the two pressure pipes and the first expansion pipe in a zigzag manner, and an inner diameter that is connected to the circulation water outlet of the first expansion pipe and is larger than the internal diameter of the first expansion pipe. And a second expansion tube having a pipe, and a pipe line connecting the circulating water outlet of the second expansion tube to the floating separation tank and having an inner diameter smaller than that of the second expansion tube.

In addition, another feature of the present invention is a flotation separation method in which the floc formed from the inflow water is floated and removed with a skimmer for advanced treatment, wherein the chemical and flotation treatment water and air according to the inflow water are included in the inflow water inlet side of the flotation tank. When the discharged circulating water is discharged, the circulating water is rapidly introduced at high pressure inside the floating separation tank at high pressure, and rapidly diffuses into nano bubble water including nano bubbles, and the upper portion reaches the pin floc and colloidal state of the influent by the nano bubble water. The floc floated to the top is removed with a skimmer and the treated water is discharged to the treated water outlet.

In the above, the nano-bubble water is pressurized by a pressurized pump with the treated water treated in the flotation tank as the circulating water, and the pressurized circulating water is introduced into the injector, and the necessary chemicals and air are injected when the injector is introduced again. After the pressurization and expansion of the pipe line are repeated many times, the air and chemicals are dissolved in the circulating water as much as possible and ejected into the flotation tank, whereby the volume is expanded to atmospheric pressure at high pressure to become nano air bubble water. .

When the nanobubble water is mixed with the influent by this apparatus and method, the chemical dissolved in the nanobubble water rapidly diffuses into the flotation tank, causing reaction / agglomeration to form Pin-Floc, thereby forming the flow rate of the flotation tank. By reacting with the non-degradable material including TN, TP while flowing in the flow direction of the flow of water to form a scum (Scum) is removed by the upper skimmer to process.

At this time, the number of the above-described nano-bubbles as ejected at a high pressure (3 ~ 20kg / ㎠) Water Flow ton (H ⁺⁾ and hydroxyl (OH ^-) are formed by hydroxyl (OH ^-) is to penetrate far inside the pin floc protein, etc. Destroys and releases carbon dioxide (CO ₂ ) to reduce the amount of sludge generated, and can be separated by a small amount of nano-bubble water.

This method is theoretically and theoretically different from the existing method of floating flotation by floating air bubbles on a large floc surface.

In addition, since nano bubble water is ejected at high pressure (3 ~ 20kg / ㎠) to atmospheric pressure, the volume is expanded tens of times according to Boyle-Shal's law, so that pin floc and colloidal particles can be produced even with a small amount of circulating water (5 ~ 20% of influent). Separate the float. Moreover, since the bubble size is nano size, the floating time takes longer than that of the conventional large bubble, so that the hydrolysis of the water is performed well and the treatment efficiency of the influent is improved.

Pin-Floc is a floc of particles that do not sink or float even when stagnant. Colloid refers to particles in which the positive and negative charges are balanced on the surface of the particles and are in a stable state. Say.

According to the present invention configured as described above can treat the hardly decomposable substances in sewage / waste water, total nitrogen (TN) is removed more than 30%, total phosphorus (TP) 99%, BOD, COD _Mn is removed more than 50% Therefore, it is possible to easily handle hardly decomposable substances, total nitrogen (TN) and total phosphorus (TP), which have been difficult to treat in various sewage / wastewater treatment plants so far, which can greatly help in preventing water pollution and improving the water environment. .

Moreover, the inflow water is directly put into the flotation tank without treatment such as flocculation, and the residence time within the flotation separation tank is within 5-20 minutes, so that no flocculation tank, neutralizing tank, reaction tank is required, and the size of the flotation tank is also reduced. As a result, facility costs and operating costs are greatly reduced.

In addition, the existing pressure flotation method causes stagnation (more than 30 minutes) in the floating tank and attaches air bubbles to the surface of the large floc, causing the flotation to take place, requiring a long time (more than 1.5 hours) to generate a large floe. However, the present invention serves to serve as a low-flow (flow rate: 0.1 ~ 0.001m / sec) pipe to the flotation tank to collect the injured scum in the upper flow direction, gathered while flowing from the inlet inlet Since only the scum needs to be removed by the skimmer, the size of the skimmer can be reduced, thereby reducing the facility cost.

1 is a view showing a flotation separator according to the present invention;
2 is a view showing the injector and nano-bubble generating device of the present invention

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Floating separation apparatus according to the present invention includes a floating separation tank 10, a pressure pump 20, an air compressor 60, a chemical injection pump 50, an injector 110, a nano bubble generator 100. It is configured by.

In the above-mentioned floatation separation tank 10 is an inlet water inlet 12 through which the inlet water is introduced by a certain amount by the flow meter, the outlet formed in the opposite side of the inlet water inlet 12, the discharged water is discharged by the automatic water quantity adjusting device ( 14), the plurality of partitions 16 are formed to protrude perpendicularly to the bottom of the inlet 12, the upper end is lower than the proper surface of the water separation tank 10, the treatment water outlet 14 The scum storage tank 30 is installed adjacent to the side and the outer peripheral surface of the floating separation tank and the outer peripheral surface is installed in the scum storage tank 30 and the upper portion of the scum storage tank 30 in front of the scum storage tank 30 scum storage tank 30 It comprises a skimmer 40 to move to.

In addition, the pressure pump 20 is connected to the bottom of the treated water outlet 14 side of the floating separation tank 10 by a pipe to circulate the treated water of the floating separation tank 10 to the circulating water.

In addition, the chemical injection pump 50 discharges the chemicals by a predetermined amount from the chemical storage tank 52 in which the chemicals necessary for the inflow water treatment are stored according to the components of the inflow water introduced into the flotation separation tank 10.

The injector 110 connected to the pressure pump 20, the air compressor 60, and the chemical injection pump 50 has an inlet side of the hollow part 112 formed to have an inner diameter narrowed from an inlet and widened to an outlet side again. The chemical inlet 114 and the air inlet 116 connected to the pressure pump 20 and connected to the air compressor 60 and the chemical infusion pump 50 are drilled at the end of the portion where the inner diameter is narrowed.

In addition, the nano-bubble generating device 100 is introduced into the inlet 12 and the inlet of the floating separation tank 10 by repeating the expansion and compression of the circulating water discharged from the injector 110 by the above-mentioned chemicals and air is injected many times. It serves to inject in the form of nano-sized bubbles to the bottom of the inlet 12 side, the configuration is as follows.

The nano-bubble generating device 100 is formed in a U-shape, the center 122 is connected to the outlet of the injector 110, one end of both sides 124 is blocked and the other end is open and the inner diameter is A first expansion tube formed wider than an outlet of the injector 110 and having a first blocking plate 126 formed on one side of a center connected to the injector 110 to restrict the flow of circulating water, and the first expansion tube 120 described above; A plurality of pressurizing pipes 130 connecting the two side portions 124 to each other and having a smaller inner diameter than the first expansion pipe 120 to pressurize (contract) the circulating water, and the plurality of pressurizing pipes 130 and the first A plurality of other blocking plates 140 installed inside the first expansion pipe 120 to discharge the expansion pipe 120 zigzag and discharge to the outlet, and the water outlet of the first expansion pipe 120 described above. And a second expansion tube 150 having an inner diameter greater than that of the first expansion tube 120 and the second expansion tube 150. Connecting the outlet and the water exchange floatation tank 10 and is configured to include a second expanded inner diameter of the tube is smaller than 150, the channel 160.

The closed end of the first expansion tube 120 may be integrally installed in the second expansion tube for shape stability and space reduction.

In the figure, PG, G1, G2, and G3 pressure gauges are shown, F1, F2, and F3 indicate flow meters, and V1, V2, V3, and V4 indicate valves.

And, using the above-mentioned flotation separation device and looks at the flotation separation method for advanced sewage / wastewater treatment.

The floating separation method according to the present invention discharges nanobubbles including circulating water circulated with the chemicals according to the inflow water and the treated water of the floating separation tank at the inflow inlet and the bottom of the inflow inlet of the floating separation tank, and the nanobubbles are instantaneously discharged through the ejector. At high pressure (3 ~ 20kg / ㎠) is introduced into the floating separation tank at atmospheric pressure (1kg / ㎠) state becomes nano bubble water.

And, this nano number of bubbles while being instantaneously diffused into flows tone (H ⁺⁾ and hydroxyl (OH ^-) is in a colloid positively charged is a hydroxy group (OH ^-) - combined with the flow-tone (H ⁺⁾ and coupled to the negative charge () As a result, a pin floc is formed, and nano-bubbles are contained in the pin floc itself, and the flotation is separated.

In addition, the biologically unprocessable hardly decomposable substance acts to stably process by destroying the Floton (H ⁺ ) and the hydroxyl group (OH ⁻ ) of the nano-bubble water.

In this way, the nanobubble water is floated upward to the pin floc and the colloid of the influent, and the floc floated upward is removed by the skimmer.

On the other hand, in the above chemicals, hydrated lime, iron salt, aluminum salt, etc. are selectively used according to the type of influent.

In addition, the nano-bubble water is first pressurized with a pressurized pump using the treated water treated in the floating separation tank as a circulating water, and the first pressurized air is introduced into the injector, and the necessary chemicals and air are injected again when the injector is introduced. After pressurization, pressurization and expansion of the pipe line are repeated many times, dissolving the air and chemicals in the circulating water as much as possible, and ejecting them to the floating separation tank. do.

At this time, the injection amount of the circulating water (Q1) and the chemicals (C1, C2) is adjusted according to the quantity of inflow water (Q) detected by the flow meter (F1), the circulating water (Q1) is a flow meter (F2) And through the valve (V1) chemicals (C1, C2) is automatically adjusted through the flow meter (F3) and the chemical injection pump 50 is injected into the injector 110. Then, the pressure of the air injected into the injector 110 is adjusted by the air compressor so that the pressure (G3) of the circulating water containing the nano-bubble and the drug injected into the flotation separation tank 10 is kept constant.

In addition, the amount of nano bubble water is circulated water (Q1) is determined according to the inlet water (Q) is distributed to the automatic valves (V2, V3, V4) at a constant ratio, the nano bubble water in the pressure pump (P1, P2) alternate operation It is then introduced into the floatation tank.

In addition, the amount of water discharged from the floating separation tank 10 is controlled by an automatic water level adjusting device V1. Through this process, the level of the floating water separation tank 10 and the thickness of the scum floating on the upper part are adjusted. .

In addition, such a series of control processes are programmed by the PLC to be automatically controlled by the controller (MCC), specifically, the water level and the sludge water content of the flotation tank by the circulating water, the injected chemical amount, and the treatment level control device according to the inflow water Automatically controlled by the controller MCC through programming.

The influent treatment process according to the flotation separation method of the present invention will be described in detail below.

First, when Al ⁺³ and nano bubble water are injected into the inlet inlet of the flotation tank, the nano bubble water is diffused (high pressure → 1atm), and the influent and the nano bubble water are agitated. In this process, AlPO ₄ floc, an insoluble salt, is formed. Deadlock.

The flocs formed as described above are attached to the nano-bubbles having a diameter of 50 nm or less included in the nano-bubble water, and thus the flocs are separated and separated by the nano-bubbles.

In this process, a hydroxyl group (OH ^-) of the nano-bubbles can penetrate the cell membrane of the microorganism contained in the effluent and reduce the sludge production sikimeuro oxidative degradation of proteins, thereby also separating portion colloidal state.

The flocculated sludge can obtain concentrated sludge with a water content of about 95%, so no separate sludge thickening tank is needed, and the flocculated sludge contains total phosphorus in the insoluble salt (AlPO ₄ ) state, and the total phosphorus as sludge treatment is 99%. Remove

Therefore, the floating separation method (NAF method) according to the nano-bubble water of the present invention uses a nano bubble (50 nm or less), so the floating separation time is 10 minutes, and when the Alum is injected into the injection nozzle inlet, the nano air bubble water As it is diffused, the chemical solution is also diffused and reacted at the same time, thereby eliminating the need for a reaction tank or agglomeration tank.

In addition, the upper cum can be concentrated in the sludge flotation tank to obtain the sludge, so the sludge thickening tank is not required, and the sludge moisture content can be adjusted.

Look at the embodiment by the flotation separation apparatus and method configured as described above.

In the Pilot Plant experiment, the circulation water pressure (G3) was 6 atm, the circulation water volume (Q1) was 10% of the influent water, and when aluminum was used as a chemical, 10 minutes of flotation separation time, 20 seconds of nano bubble water generation, and scum The moisture content is 95%, and the removal rate according to the amount of aluminum used is as follows.

In Tables 1 to 6 below the units are ppm.

-20 ppm injection of Alum

-25ml injection of Alum

-Alum 30ppm injection

-20 ppm injection of Alum

-25ml injection of Alum

-Alum 30ppm injection

In the above experiments, when T-P 2.0ppm (for example), the T-P 99% is removed at the time of injecting 25ppm of Alum 20% solution. This is 1.9: 1 with Al: P.

Floating separation by Nano Air Bubble water, Pin-Floc is advantageous for floating separation, large Floc is a detrimental factor to the present invention, facility cost, operation management costs only a lot.

Do not use other drugs such as polymer.

The present invention is not limited to the above embodiments, but can be modified and practiced in various ways within the scope of the claims and the detailed description of the invention and the accompanying drawings, which also belong to the invention.

10: flotation tank 20: pressure pump
30: air compressor 50: chemical injection pump
110: injector 100: nano bubble generator

Claims (5)

In the flotation device for flotation formed from inflow water flowing into the inflow water inlet, it is removed with a skimmer for advanced processing, and the treated water is discharged to the outlet.
A pressurized pump connected to the outlet side bottom of the floating separation tank by a pipe and circulating the treated water of the floating separation tank to circulating water;
Air compressors;
A chemical infusion pump for discharging a chemical required for the influent treatment from the chemical tank according to a component of the influent;
The pressurization pump is connected to the inlet side of the hollow portion which has an inner diameter narrowed from the inlet and widened to the outlet side, and a chemical inlet and an air inlet connected to the end of the portion where the inner diameter is narrowed through an air compressor, a chemical injection pump and a pipe line. Perforated injectors;
Nano-bubble water generator for producing the nano-bubble water by repeating the expansion and compression of the circulating water discharged from the injector by the medicine and air is supplied to the inlet water inlet side of the flotation tank;
Control unit to automatically control the operation of each part constituting the flotation separator through PLC programming to automatically control the water level and sludge water content of the flotation tank by the circulating water, the amount of injected chemicals and the treatment level according to the inflow water ( MCC); Characterized in that comprises a,
Flotation separation device to complete the advanced treatment of influent in one tank without the need for reaction / aggregation / neutralization tanks. The method of claim 1, wherein the flotation tank is formed at least one partition wall lower than the appropriate surface of the flotation tank in the front lower portion of the inlet inlet, the scum storage tank on the treated water outlet side so that its outer peripheral surface is spaced apart from the inner peripheral surface of the flotation tank And installing the scum storage tank so that the treatment water tank is automatically formed so that only the treated water is stored between the treated water outlet and the scum storage tank. According to claim 1, wherein the nano-bubble water generating device is formed in a U-shape, the center is connected to the outlet of the injector, and has a wider inner diameter than the outlet of the injector for limiting the circulating water flow in one direction connected to the injector in only one direction A first expansion pipe formed with a first blocking plate,
A plurality of pressure pipes connecting both sides of the first expansion pipe to each other and having a smaller inner diameter than the first expansion pipe to pressurize (shrink) the circulating water;
A plurality of blocking plates installed inside the first expansion pipe to form and block a flow path for circulating water to pass through the plurality of pressure pipes and the first expansion pipe in a zigzag manner;
A second expansion tube connected to the circulating water outlet of the first expansion tube and having an inner diameter larger than that of the first expansion tube;
Floating separator for connecting the circulating water outlet of the second expansion tube and the floating separation tank, and comprising a conduit having a smaller inner diameter than the second expansion tube. In the flotation separation method in which the floc formed from the influent is floated and removed with a skimmer to perform advanced processing.
When the circulating water containing the chemicals and the treated water and the air in the floating separation tank are discharged at the inlet water inlet of the floating separation tank, the circulating water is rapidly diffused from the high pressure into the atmospheric pressure inside the floating separation tank to contain nano bubbles. It becomes nano bubble water and floats up to the pin floc and colloidal state of the inflow water by the above-mentioned nano bubble water, so that the floc floating to the top is removed by skimmer and the treated water is discharged to the treated water outlet,
The nano-bubble water is pressurized first with a pressurized pump using the treated water treated in the floating separation tank as a circulating water, and the pressurized circulated water is introduced into the injector, and when the injector is introduced, the necessary chemicals and air are pressurized again. After the pressurization and expansion of the pipe line are repeated many times, the air and chemicals are dissolved in the circulating water as much as possible and spouted into the floating separation tank, and the volume is expanded to the atmospheric pressure at high pressure to become nano air bubble water. Characterized in that,
Flotation separation method that allows the advanced treatment of influent in one tank to be completed without the need for reaction / aggregation / neutralization tanks. delete

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