KR101181800B1 - The method and apparatus to treat municipal and industrial wastewater - Google Patents

Abstract

The present invention provides sludge and fluidized bed carriers in a reactor for treatment of sewage or wastewater containing or without surfactants, and sludge or biofilm fluidized beds are formed by aeration from the bottom of the reactor and the reactor treated water is discharged. High-level treatment such as removal of waste and organic matter and nitrogen removal, and the surfactant dissolved in the waste water or in the form of micelles are transferred to the interface between the air and the waste water of air or oxygen bubbles. As the dissolved pollutant and the like rise together with the bubble, the surfactant and the dissolved pollutant are separated from the upper part of the reactor without the separate secondary treatment of the separated and collected bubbles of the foam generated on the upper surface of the reactor required in the prior art. Oxidized or decomposed and at the bottom of the reactor residual organics and inorganics Oxidation or decomposition treatments are carried out, and in the aeration tanks of conventional sewage treatment plants, the concentration of pollutants including surfactants on the water surface is larger than that in the water, and the waste water treatment is carried over to the next process due to overflow from the water surface. The present invention relates to a wastewater treatment method and a reactor apparatus for improving the inefficiency .

Sewage water, surfactant, air or oxygen bubble, oxidation

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.

In the present invention, sludge and fluidized bed carriers are filled with sludge and fluidized bed carriers and aeration from the bottom of the reactor for the treatment of wastewater containing surfactants or wastewater containing no surfactants or surfactants, such as synthetic dyeing wastewater. The reactor treated water is discharged to perform advanced treatment such as removal of organic wastes and nitrogen from the wastewater, and surfactants dissolved in the wastewater or present in the form of micelles are treated with air or oxygen bubbles of air and wastewater. As the transition to the interface and the rise of dissolved pollutants and the like together with the bubbles, the interface without separation and separation of the bubbles generated on the surface of the reactor upper surface required in the prior art in the reactor and separate secondary processing for the separated collected bubbles The active agent and dissolved pollutant are oxidized or decomposed and It relates to a method for performing oxidation or decomposition process of organic and inorganic substances and the reactor apparatus.

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. The wastewater treatment efficiency is inefficient because the concentration of the pollutant contained is larger than that in the water and the treated water is transferred to the next process due to overflow from the water 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 , the existing aeration reactor installed by the activated sludge process by microbial aeration conventionally adopted in sewage water treatment plants is generally suspended in the water because the surfactant dissolved in the waste water due to aeration is concentrated in the bubble . Wastewater treatment efficiency is inefficient because the concentration of pollutants including surfactants is larger than in water and the reaction tank treated water is transferred to the next process due to overflow from the water surface . In addition, traditional aeration reaction tank interface additional facility is not only required for a collecting device and a secondary treatment of the surface active agent foam surfactants for absorption of foam, conventional aeration tank occurs on the surface on an existing installation is that the bubbles (bubble) within the reaction tank While rising vertically, 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 The reactor treated water is discharged as it enters the bottom and the wastewater stream is treated in an upflow. Surfactant produced by creating and stacking surfactant bubbles on the top surface of the reactor as air or oxygen bubbles rise from the bottom of the reactor, and the accumulated bubbles are broken and generated by a plurality of screens with small openings. Dropped by the surfactant bubble self-weight accumulated above the droplets, and lowered to the upper surface of the reactor is recovered, while the re-dissolved surfactant is oxidized or decomposition treatment at the top of the reactor. Therefore, the concentration of the reactor treated water from which the reactor treated water is discharged is smaller than that of the upper surface of the reactor. As described above, the present invention provides a reactor for dissolving the dissolved pollutant with the re-dissolved surfactant and bubbles without separate secondary treatment of the bubbles generated on the upper surface of the reactor required for the prior art and the separate collected bubbles. Oxidation or decomposition treatment in the upper part, while oxidation or decomposition treatment of residual organic and inorganic substances in the lower part of the reactor are carried out to discharge and treat reactor treated water of the minimum pollution concentration in the wastewater pollutant concentration distribution with respect to the reactor height from the reactor treated water outlet. The present invention relates to an efficient wastewater treatment method and a reactor apparatus discharged through a tank.

The effect of the present invention is that in sewage treatment using surfactants, surfactants and bubbles (bubble) without separate secondary treatment of the bubbles and segregation of the bubbles generated on the upper surface of the reactor required in the prior art, and separately collected bubbles Oxidized or decomposed treatment of the dissolved pollutant which floated together at the upper part of the reactor, while oxidation or decomposition treatment of residual organic and inorganic materials were carried out at the lower part of the reactor, so that the minimum source concentration was The wastewater can be treated efficiently by discharging the reactor treated water .

In addition, the present invention is a reactor in which raw sewage water is introduced from the bottom of the reactor to be treated in an upflow manner. 1) The land area occupied by the reactor is much higher than that of the conventional aeration reactor in a wastewater treatment plant where the flow of wastewater in the reactor is horizontal. Small and economical ; 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 are broken or 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. A phase is formed and the reactor treated water outlet discharges the reactor treated water with the minimum pollutant concentration from the wastewater contaminant concentration distribution to the reactor height and discharges it through the mooring tank to perform the efficient advanced treatment such as the removal of organic matter and nitrogen removal of the wastewater. ;

Surfactant dissolved in sewage water or in the form of micelles transfers to the interface between air or oxygen in air or oxygen bubbles and the bubble rises from the bottom of the reactor, while the bubbles rise from the bottom of the reactor Bubbles are produced;

Above the surface of the reactor there are 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 they 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 Figures 1 and 2 for the treatment of wastewater 1) the wastewater raw water 19 inlet (1), the air diffuser (2) to generate air or oxygen microbubble (20) and flow consultation A reactor lower part 4 composed of perforated partitions 3 through which the sieve cannot pass; 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, a mooring tank 10, a mooring tank sludge pump 12, and a conveying tank located at a mooring tank inlet 11 above the reactor treated water outlet 9 position. Tank 13, conveying tank sludge pump 14, sewage water feed pump 15, blower 16 for supplying air or oxygen to the diffuser, surfactant injector 17 and air outlet 6, It consists of a connected vacuum suction device 18. 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) A surfactant dissolved in the sewage water introduced into the reactor from the bottom of the reactor or present in the form of micelles is formed at the interface between the air bubble or oxygen bubble generated from the bottom of the reactor and the waste water. Adsorption and concentration by mass transfer, a bubble in which a surfactant is adsorbed due to the density difference between air and wastewater rises to the top of the reactor; 3) a process in which the surfactant foam generated on the surface of the reactor at the top of the reactor is 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) at the reactor treated water outlet, discharging the reactor treated water of the minimum source concentration in the pollutant concentration distribution of the wastewater to the reactor height; 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 a vacuum suction device 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
30. Air or gas containing oxygen

Claims (19)

Raw wastewater for sewage treatment is introduced into the reactor from below the bottom of the reactor; Surfactant contained in the wastewater introduced into the reactor is adsorbed by mass transfer of air bubbles or oxygen bubbles generated at the bottom of the reactor by mass transfer; Due to the density difference between air and sewage water, bubbles adsorbed on the surface of the reactor rise to the top of the reactor, and the surfactant bubbles generated on the surface at the top of the reactor are redissolved on the surface, or dissolved or micelle type surfactants. And the floating dissolved material is oxidized or decomposed; As the surfactant bubbles pass through the plurality of screens, the bubbles break or become smaller and droplets containing the surfactant produced therein are lowered and recovered above the surface of the reactor; At the bottom of the reactor, oxidation or decomposition treatment of residual organic and inorganic materials is carried out so that the reactor treated water having the minimum source concentration is discharged from the reactor treated water outlet in the pollutant concentration distribution of the wastewater with respect to the reactor height; The reactor treated water is introduced using water head to the mooring tank inlet connected to the reactor above the height of the reactor treated water outlet; Separated into suspended particles consisting of external effluent and microbial sludge in the mooring tank connected to the reactor; Sewage water treatment method characterized in that the suspended particles composed of the microbial sludge is returned to the lower portion of the reactor. delete delete delete The process of claim 1 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. The method of claim 1, wherein the reactor is composed of each stage separated by a perforated partition through which the packed fluidized bed microbial carrier cannot pass. delete delete According to claim 1, wherein the screen, a plurality of horizontally installed on the screen support for lowering the liquid drop down the inclined surface of the screen support and re-dissolved to the upper surface of the reactor through the drop down hole, or horizontally each of the screen on the upper surface of the reactor Wastewater treatment method characterized in that it is installed to form a plurality of empty stages separated by. The wastewater treatment method according to claim 1, wherein the screen is a screen having a body opening of a size of 5 mm x 5 mm or less. The wastewater treatment method according to claim 1, wherein the screen is a screen on which intermittent vibration movement is performed by a manual or automatic vibration device. The method of claim 1, wherein the sludge is discharged from the upper surface of the reactor or below the reactor, the sludge is discharged to the lower portion of the reactor or introduced into the tank inlet connected to the reactor. 13. The wastewater treatment method according to claim 12, wherein the sludge is returned from the conveying tank to the lower part of the reactor. delete According to claim 1, In the case of sewage raw water 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 sewage raw water introduced into the reactor Wastewater treatment method, characterized in that. delete delete delete delete

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