KR20110047453A - The method and apparatus to treat municipal and industrial wastewater - Google Patents

Abstract

PURPOSE: Treatment method and apparatus for sewage and wastewater are provided to effectively treating the sewage and wastewater by discharging reactor-treated water with the minimum pollutant concentration. CONSTITUTION: A treatment apparatus for sewage and wastewater comprises a reactor lower part(4), a reactor upper part(8), and a reactor processed water outlet(9). A surfactant inside the sewage and wastewater flowing into a reactor, is attached to air bubbles and oxygen bubbles generated from the reactor lower part. The bubbles attached to the surfactant are elevated to the reactor upper part by the density difference of air and the sewage and wastewater, to be re-dissolved to the surface of water.

Description

The method and apparatus to treat municipal and industrial wastewater

Representative cases of sewage and wastewater containing surfactants are synthetic dye wastewater discharged from the dyeing complex. The textile / dye processing industry is a labor-intensive industry compared to other industries, and the unit workplace is relatively small and medium. Therefore, there are many places where the basic infrastructure and wastewater treatment facilities of the unit workplace are very poor to support the production. To solve this problem, most dyeing and processing sites form one industrial complex and comprehensively treat the wastewater in the industrial complex. Therefore, in general, synthetic dyeing wastewater is a wastewater mixed with all kinds of wastewater discharged from the dyeing process. In other words, it is a mixed wastewater such as dyeing wastewater, weight loss wastewater, decanting, refining wastewater, etc. It contains not only various dyes but also surfactants, bleaches, salts, PVA, alkali, TPA (Terephthalic acid) -2Na salt and EG ( Ethylene Glycol) is contained in a large amount, and among them, surfactants make up a large part of BOD and COD of synthetic dye wastewater.

The present invention is to charge sludge and fluidized bed carrier in the reactor and to treat sludge or fluidized bed fluidized bed, such as synthetic dyeing wastewater, and to form sludge or biofilm fluidized bed by aeration from the bottom of the reactor. And discharge the reactor treated water at the upper and lower boundary of the reactor to perform advanced treatment such as the removal of inorganic and inorganic matter from the wastewater and the removal of nitrogen, and the surfactant dissolved in the wastewater or present in the micelle form is air or oxygen bubble. As a transition to the interface between the wastewater and the sewage, and also the dissolved pollutant and the like rises together with the bubble, the interface without separation and separation of bubbles generated on the upper surface of the reactor required by the prior art at the reactor top and separate secondary processing for the separated collected bubbles Active and dissolved contaminants are oxidized or decomposed The lower part relates to a method and reactor apparatus for carrying out oxidation or decomposition treatment of residual organics and inorganics.

Korean Patent Registration No. 163659 is a mixture of a surface active agent and a catcher, which artificially generates fine micro bubbles in a bubble generator, and continuously supplies these micro bubbles to a sewage treatment system, so that impurities and micro bubbles in the sewage water It is a technology that treats solids in sewage water by physically and chemically ionizing and forcibly separating them from the surface of sewage water in a single flotation tank. Similarly, U.S. Patent No. 4,203,837 discloses a method for removing suspended solids and dissolved substances in sewage using microbubbles prepared by using artificially surfactants.

On the other hand, Published Patent Publication No. 2003-0024455 is similar to Korean Patent Registration No. 163659, which generates microbubbles with only surfactant and supplies them to the wastewater, and passes the wastewater and microbubbles in a continuous process sequentially through several independent floating tanks and discards them. The present invention relates to a technology for treating sewage water by collecting it as a collecting device. In addition, Patent Publication No. 2002-0005864 discloses bubbles in contaminated water systems such as contaminated lakes and streams, and separates bubbles into U-shaped waterways or baffles, and transfers the separated bubbles to sewage treatment plants. The present invention relates to a method and apparatus for purifying a contaminated water system such as a contaminated lake and a river by a biofilm. The prior arts enumerated so far separate the bubbles containing the surfactants and separate them into a waste collecting device, a U-water channel or a baffle, but there is a possibility of secondary pollution due to the separated collected waste papers. Additional equipment for treatment is required .

On the other hand , conventionally installed aeration reactors by the activated sludge method of microbial aeration, which has been traditionally adopted in sewage treatment plants, generally use surfactants in the water because surfactants dissolved in the wastewater due to aeration are concentrated in bubbles and float to the surface. Wastewater treatment efficiency is inefficient because the pollutant concentrations included are larger than underwater and the treated water is transferred to the next process due to overflow from the surface .

The prior art separates and collects bubbles containing surfactants with a waste trap collecting device, a U-water canal or a baffle, but there is a possibility of secondary pollution due to the collected waste waste. Equipment is required . On the other hand , conventionally installed aeration reactors by the activated sludge method of microbial aeration, which has been traditionally adopted in sewage treatment plants, generally use surfactants in the water because surfactants dissolved in the wastewater due to aeration are concentrated in bubbles and float to the surface. Wastewater treatment efficiency is inefficient because the pollutant concentrations included are larger than underwater and the treated water is transferred to the next process due to overflow from the surface . In addition, traditional aeration reaction tank surfactant for capture of bubbles additional facility is not only required for a collecting device and a secondary treatment of the surface active agent foam, conventional aeration tank occurs on the surface on an existing installation is a bubble portion vertically within the reaction tank On the other hand, the wastewater stream is treated horizontally, so the water surface occupies a large area. Therefore, the installation cost is high and it is very difficult to collect and treat the surfactant foam of the surfactant foam generated on the water surface.

The present invention is to treat sewage and wastewater that contains or does not contain a surfactant that occupies a part of sewage BOD and COD, and when surfactant is not contained , a surfactant is added to the sewage raw water, and the sewage raw water is Reactor treated water is discharged from the upper and lower boundary of the reactor as it enters the bottom and the wastewater stream is treated as an upflow. Surfactant bubbles are generated and accumulated on the surface of the reactor top as air or oxygen bubbles rise from the bottom of the reactor, and these accumulated bubbles are broken up by a plurality of screens having small openings, and the resulting liquid containing the surfactant is repeated. As the enemy descends due to the self-surfacing surfactant bubble weight and descends to the upper surface of the reactor, the redissolved surfactant is oxidized or decomposed at the top of the reactor. Therefore , the concentration of the reactor treated water at the upper and lower boundary of the reactor from which the reactor treated water is discharged is smaller than the concentration of the upper surface of the reactor. As described above, the present invention oxidizes the dissolved pollutant floating with the re-dissolved surfactant and the bubble at the top of the reactor , without separate secondary treatment of the bubbles generated on the upper surface of the reactor and the separate collected bubbles required in the prior art. Or at the bottom of the reactor, while performing the oxidation or decomposition treatment of residual organic and inorganic materials at the bottom of the reactor, at the reactor treatment water outlet located at the boundary of the upper and lower portions of the reactor, the reactor having the minimum source concentration in the wastewater source concentration distribution for the reactor height. The present invention relates to an efficient wastewater treatment method and a reactor apparatus for discharging treated water and discharging it through a mooring tank.

The effect of the present invention is to treat the sewage waste water using the surfactant , without the separate collection of the bubbles generated on the water surface of the reactor required in the prior art and separate secondary treatment for the separated collected bubbles, floating together with the surfactant and bubbles One dissolved source is oxidized or decomposed at the top of the reactor, while the bottom of the reactor is subjected to the oxidation or decomposition of residual organics and inorganics, so that the concentration of sewage contaminants with respect to the height of the reactor at the reactor treated water outlet located at the upper and lower boundary of the reactor. The wastewater can be treated efficiently by discharging the reactor treated water of the minimum pollution concentration in the distribution .

In addition, the present invention is a reactor in which raw sewage water is introduced from the bottom of the reactor and treated in an upflow manner, 1) the land area occupied by the reactor is much smaller than that of the conventional aeration reactor in a wastewater treatment plant where the flow of wastewater in the reactor is horizontal; 2) The surface of the upper part of the reactor has a plurality of screens having a body opening hole of 5mm x 5mm or less, the surfactant bubbles generated on the surface of the upper part of the reactor passes through the plurality of screens, the bubbles break or become small, The droplets containing the surfactants are lowered by the weight of the surfactant bubbles accumulated on them and recovered to the upper surface of the reactor, thereby oxidizing or decomposing the re-dissolved surfactants at the top of the reactor .

According to the present invention, when the wastewater to be treated does not contain a surfactant, the surfactant is injected into the reactor from the outside of the reactor or artificially injected into the wastewater to be treated with the appropriate amount of the surfactant. In the case of sewage and wastewater containing surfactants, which occupy part of the waste water BOD and COD, sludge and fluidized bed flow is filled with sludge and fluidized bed carrier in the reactor for sewage treatment, without artificial injection of surfactant and by aeration from the bottom of the reactor. At the reactor treatment water outlet formed at the phase and located at the upper and lower boundary of the reactor , the reactor treatment water of minimum source concentration is discharged from the wastewater source concentration distribution to the reactor height and discharged through the mooring tank to remove organic matter and waste nitrogen from the wastewater. Efficient altitude treatment, such as removal And perform;

Surfactant bubbles dissolved or present in micelle form in the sewage water transition to the interface between the air of the air or oxygen bubble and the waste water, and the bubbles rise from the bottom of the reaction vessel to form surfactant bubbles on the water surface above the reaction vessel;

The surface of the upper part of the reactor has a plurality of screens having a body opening hole of 5mm x 5mm or less, so that the resulting surfactant bubbles are broken or small as the bubbles pass through the plurality of screens, including the generated surfactant The present invention relates to a method and a reactor apparatus for oxidizing or decomposing a re-dissolved surfactant at the top of a reactor while the droplets are dropped and recovered to the top of the reactor, and at the bottom of the reactor, for oxidizing or decomposing residual organics and inorganics. Therefore, the present invention is significantly different from the prior art using a surfactant in that sewage treatment is performed without separate secondary treatment of the bubbles generated on the upper surface of the reactor and the separated and collected bubbles .

The apparatus of the present invention, as shown in Figure 1 and 2 for the treatment of wastewater 1) the wastewater raw water 19 inlet (1), the air diffuser (2) and the fluid carrier to produce the air or oxygen fine bubble (20) can not pass through A reactor bottom 4 composed of perforated partitions 3; 2) a reactor top 8 composed of a plurality of screens 5, screen supports 24, air outlets 6, sludge outlets 7 and perforated partitions 3 through which the fluid carrier cannot pass; 3) A reactor 26 consisting of a reactor treated water outlet 9 located at the boundary between the reactor lower part 4 and the reactor upper part 8, wherein the mooring tank inlet 11 is located above the reactor treated water outlet 9 position. Mooring tank 10, mooring tank sludge pump 12, conveying tank 13, conveying tank sludge pump 14, wastewater raw water injection pump 15, blower 16 for supplying air or oxygen to the diffuser , A surfactant injection tank 17 and a vacuum suction device 18 connected to the air outlet. Instead of the installation method of the screen 5 as in FIG. 1, FIG. 2 shows that the droplet 22 descends on the screen support inclined surface 27 and the upper surface of the reactor 8 through the droplet lower hole 25. The screen support 24 provided in the reactor 26 which is redissolved and collect | recovered is shown.

The process of the present invention 1) in the case of raw wastewater that is introduced into the reactor does not contain a surfactant, the surfactant is injected into the reactor from the outside of the reactor, or the surfactant is added to the raw wastewater introduced into the reactor fair; 2) The surfactant dissolved in the sewage water introduced into the reactor from the bottom of the reactor or in the form of micelle is adsorbed and concentrated by mass transfer to the interface between the air bubble or oxygen bubble generated in the bottom of the reactor and the waste water, Surfactant-adsorbed bubbles rise to the top of the reactor due to the density difference between the wastewater and sewage; 3) a process in which the surfactant bubbles generated on the surface of the reactor at the top of the reactor are redissolved on the surface of the water, or the surfactant in dissolved or micelle form is oxidized or decomposed; 4) oxidizing or decomposing the remaining organics and inorganics at the bottom of the reactor; 5) discharging the reactor treated water of the minimum pollution concentration in the pollutant concentration distribution of the wastewater to the reactor height at the reactor treated water outlet installed at the boundary between the upper and lower portions of the reactor; 6) separating the microbial sludge into the lower part of the reactor by separating the suspended particles consisting of external discharge water and microbial sludge in the mooring tank connected to the reactor; 7) the air outlet of the reactor is intermittently connected with vacuum suction to intermittently remove the surfactant bubbles on the reactor top; 8) The upper surface of the reactor forms a plurality of empty stages, each separated by a screen, so that the bubbles are broken or small as the surfactant bubbles pass through the plurality of screens, and the droplets containing the surfactants generated at this time are lowered. Recovering above the surface of the reactor; 9) The sludge is discharged from the upper surface of the reactor or below the reactor, and is returned to the lower part of the reactor or flows into the tank inlet connected to the reactor and returns the sludge to the bottom of the reactor.

Meanwhile, the process and apparatus of the present invention are characterized in that 1) the reactor treated water is introduced using a water head into the mooring tank inlet connected to the reactor, which is above the height of the reactor treated water outlet; 2) the reactor comprises MLSS at a concentration of 100 to 30,000 mg / L MLSS or is charged with a fluidized bed microbial carrier; 3) the reactor consists of each stage separated by a perforated partition through which the packed fluidized bed microbial carrier cannot pass; 4) The screen is a screen having an opening of a size of 5mm x 5mm or less and the intermittent vibration movement is performed by manual or automatic vibration device.

1 shows a process and apparatus for sewage treatment containing surfactants

2 is a view showing a screen support installed in the reactor

* Explanation of symbols on the main parts of the drawings

1. Sewage raw water inlet

2. Air or oxygen bubble generating diffuser

3. Perforated divider that fluid carrier cannot pass through

4. Reactor bottom

5. Screen

6. Air outlet

7. Sludge Outlet

8. Reactor Top

9. Reactor treated water outlet

10. Mooring tanks

11. Mooring Inlet

12. Mooring Sludge Pump

13. Return tank

14. Carrier tank sludge pump

15. Sewage water supply pump

16. Blur

17. Surfactant injection device

18. vacuum suction device

19. Wastewater Source

20. Air or oxygen bubble

21. Surfactant Foam

22. Drops

23. Fluidized Bed Microbial Carriers

24. Screen Support

25. Droplet Downhole

26. Reactor

27. Screen support slope

28. Reactor top water surface

29. Effluents

Claims (19)

The surfactant contained in the wastewater introduced into the reactor is adsorbed by mass transfer to the interface between the air bubble or oxygen bubble generated in the lower part of the reactor and the wastewater; Due to the density difference between the air and the wastewater, the bubble adsorbed to the surfactant floats to the top of the reactor, Surfactant bubbles generated on the water surface at the top of the reactor are redissolved on the water, or dissolved or decomposed surfactants in the form of dissolved or micelle; At the bottom of the reactor, oxidation or decomposition treatment of residual organics and inorganics is carried out; Discharging the reactor treated water of the minimum source concentration in the source concentration distribution of the wastewater to the reactor height at the reactor treated water outlet installed at the upper and lower boundary of the reactor; Wastewater treatment method characterized in that. The method of claim 1, wherein the reactor treated water is introduced using a water head difference into a mooring tank inlet connected to the reactor above the height of the reactor treated water outlet; Wastewater treatment method characterized in that. 3. The method of claim 2, further comprising: separating the suspended particles consisting of external discharge water and microbial sludge in the mooring tank connected to the reactor; Wastewater treatment method characterized in that. 4. The method of claim 3, wherein the suspended particles composed of the microbial sludge are returned to the bottom of the reactor; Wastewater treatment method characterized in that. The reactor according to any one of claims 1 to 4, wherein the reactor comprises MLSS at a concentration of 100 to 30,000 mg / L MLSS or is filled with a fluidized bed microbial carrier; Wastewater treatment method characterized in that. The reactor according to any one of claims 1 to 4, wherein the reactor consists of each stage separated by a perforated partition through which the packed fluidized bed microbial carrier cannot pass; Wastewater treatment method characterized in that. The method according to any one of claims 1 to 4, wherein the surfactant bubbles break or become small as they pass through the plurality of screens, and the droplets containing the surfactant generated therefrom are lowered and recovered above the surface of the reactor. ; Wastewater treatment method characterized in that. The reactor of claim 1, wherein the air outlet of the reactor is intermittently connected with a vacuum suction device to remove surfactant bubbles on the top of the reactor; Wastewater treatment method characterized in that. 8. The screen of claim 7, wherein the plurality of screens are installed horizontally on a screen support for lowering the droplets down the inclined surface of the screen support and re-dissolving and recovering the liquid through the drop downhole to the upper surface of the reactor; Installed to form a plurality of empty stages each horizontally separated by a screen on the upper surface of the reactor; Wastewater treatment method characterized in that. 8. The method of claim 7, wherein the screen is a screen having a body opening of a size of 5mm x 5mm or less; Wastewater treatment method characterized in that. 8. The method of claim 7, wherein the screen is a screen on which the intermittent vibration movement is performed by a manual or automatic vibration device; Wastewater treatment method characterized in that. The sludge according to any one of claims 1 to 4, wherein sludge is discharged from or below the upper surface of the reactor, Being returned to the bottom of the reactor or introduced into a vessel inlet connected to the reactor; Wastewater treatment method characterized in that. 13. The method of claim 12, wherein the conveying tank conveys the sludge to the lower portion of the reactor; Wastewater treatment method characterized in that. 5. The process of any one of claims 1 to 4, wherein raw wastewater for sewage treatment is introduced into the reactor from below the reactor; Wastewater treatment method characterized in that. The wastewater raw water according to any one of claims 1 to 4, wherein the raw wastewater introduced into the reactor does not contain a surfactant; Injecting a surfactant from outside the reactor into the reactor or adding a surfactant to the sewage raw water introduced into the reactor; Wastewater treatment method characterized in that. A lower part of the reactor including a sewage raw water inlet, an air or oxygen bubble diffuser, and a perforated partition through which the fluid carrier cannot pass; A reactor top composed of a plurality of screens, air outlets, sludge outlets and perforated partitions through which the fluid carrier cannot pass, or wherein screen support is added; The reactor is made to the reactor treated water outlet, The reactor treated water outlet is located at a boundary between a lower part and an upper part of the reactor; Sewage water treatment device In addition to the reactor of claim 16; Mooring tank, mooring tank sludge pump, conveying tank, conveying tank sludge pump, sewage water feed pump, blower and vacuum suction device connected to air outlet or surfactant injection The device is additionally configured; Sewage water treatment device 17. The method of claim 16, wherein the screen support is composed of the screen support inclined surface and the drop down hole, the upper hole area is narrower than the lower hole area; Sewage water treatment device 19. The screen according to any one of claims 16 and 18, wherein the screen is installed so as to horizontally separate a plurality of empty stages on the upper surface of the reactor, respectively, or a plurality of horizontally installed on the screen support; Sewage water treatment device

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