KR20040001286A - A way and a device to purify sevage and waste water by using a bed biofilm - Google Patents

Abstract

PURPOSE: Provided is an advanced sewage and wastewater treatment apparatus having both of fixed biomedia and fluidized biomedia in a reactor to increase treatment efficiency and reduce cost. CONSTITUTION: The apparatus comprises a reactor(10) with a diffuser(20) and operating under aerobic condition, biomedia(30) fixed in the reactor(10) to be a fixed biofilm, and granular biomedia(40) arranged between the fixed biomedia(30) and fluidized in the reactor(10) by air diffused by the diffuser(20).

Description

Advanced method and apparatus for treating wastewater using biofilms {A way and a device to purify sevage and waste water by using a bed biofilm}

The present invention relates to a method and apparatus for treating sewage and wastewater using a fixed bed biofilm and a fluidized bed biofilm, and more specifically, by simultaneously immersing a fixed bed carrier and a fluid carrier in one reactor, It is a high-level treatment method that can combine the system and make up for the shortcomings and get high removal efficiency of organic matter, nitrogen and phosphorus.

In general, the wastewater treatment method using a biofilm (carrier) includes a treatment method using a fixed bed biofilm and a method using a fluid bed biofilm. As a conventional treatment method using a fixed bed biofilm, a filter bed on which a biofilm is formed is used. Spraying water treatment method to treat the treatment water by spraying the treated water using a rotating sprayer to the upper portion fixed to the rotating disk method (RBC; Rotating Biological Contactor) to immerse half the immersion of the rotating disk is formed biofilm on the surface of the treated water, Super-clean Biological Filters (SBF), in which the filtration membrane in which the biofilm is formed is immersed in the treated water to enable biological treatment by the biofilm and physical treatment by filtration. And fixed-phase Biological Aerated Filters (BAF), which are used to inject air into the air to increase processing efficiency.

That is, the carrier for forming the biofilm is fixed and treated at a predetermined position in the form of a filter phase, wherein the biofilm attached to a part of the carrier is grown in aerobic conditions and the biofilm attached to another part is anoxic to anaerobic. It provides a habitat for a variety of species that can be removed from nitrogen and phosphorus by proliferating in the presence of microorganisms. ), And it is easy to attach the sludge, which eliminates the need for the settling tank, which can reduce the area of land, and thus the maintenance and installation costs are low. On the other hand, the time required for the formation of the biofilm on the carrier is long, and the concentration of organic matter is high. If it is low, biofilm desorption proceeds and it is difficult to recover the detached biofilm. Due to the suspended suspended solids (SS) is a disadvantage that there is a factor that can reduce the treatment efficiency in which a partial blockage phenomenon occurs in the carrier.

On the other hand, the treatment method using a fluidized bed biofilm is a method of immersing the carrier in the form of particles in the reaction tank and pushing it up into the air or adjusting the water flow to contact the biofilm and the treated water in a state where the carrier is floating, which is highly processed. In contrast, it is difficult to attach suspended solids and sludge to the carrier, so that the adhesion and growth of pure nitrifying bacteria is relatively excellent, so that the ability to remove ammonia and nitrite is excellent even within a short time. By keeping the thickness of the biofilm constant, it is possible to suppress the overgrowth of the biofilm, and since the specific gravity is higher than the general sludge specific gravity, it flows with activated sludge and crushes the air by collision with air, thereby increasing the dissolved oxygen rate. There is an advantage that there are enough elements to increase the processing efficiency. On the other hand, there is a need for a separate treatment tank to remove suspended solids and sludge, there is a problem that the carrier is flowed out to the outside to supply the carrier periodically by a certain amount or to install a separate device to prevent the outflow of the carrier Due to the increase in the land area, installation and maintenance costs compared to the fixed type has the disadvantage that there is an economic burden.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is to complement the disadvantages of the fixed bed biofilm and fluidized bed biofilm with their respective advantages and advantages when treating the waste water using a biofilm In order to reduce the economic burden and maximize the processing efficiency.

To this end, fixed fixed media (carriers) are installed in one reactor at a predetermined interval to form a fixed biofilm, and a particulate fluid medium (carriers) is formed between the fixed fixed media (carriers) and air bubbles sprayed from the bottom. It forms a fluidized biofilm suspended by the particles, so that the suspended solids and sludge filtration function by the fixed bed biofilm, the collision phenomenon by the fluidized bed biofilm increases the suppression of overgrowth and dissolved oxygen of the fixed bed biofilm, fixed bed biofilm It is to prevent the outflow of fluidized bed biofilm by.

1 is a partial cutaway perspective view showing a configuration according to an embodiment of the present invention.

2 is a cross-sectional view of FIG.

3 is a partially cutaway perspective view of yet another embodiment of the present invention.

4 is a cross-sectional view of FIG.

5 is a partially cutaway perspective view showing a third embodiment of the present invention.

6 is a cross-sectional view of FIG.

Explanation of symbols on the main parts of the drawing

10: reactor 20: diffuser

30, 30a: filter bed carrier 40: particulate carrier

50: screen 60: floating body

The present invention relates to a wastewater treatment method using a biofilm, wherein the wastewater is treated using a treatment apparatus in which a fixed bed biofilm and a fluidized bed biofilm are simultaneously formed in one reactor.

Hereinafter, with reference to the accompanying drawings will be described in more detail the configuration and operation of the processing apparatus for carrying out the present invention.

As shown in FIG. 1 and FIG. 2, the present invention is provided with an acidic device 20 and is arranged in a state in which the filtration carrier 30 is fixed inside the reaction tank 10 operated in an aerobic state to form a stationary biofilm. The particulate carrier 40 is formed between the listed filtration carriers 30 so that the fluidized biofilm is formed by the air particles sprayed from the air diffuser 20.

At this time, the filter bed carrier 30 is installed to allow the flow of the particulate carrier 40 to the upper and lower portions of the filter bed carrier 30 by fixing the floating bed in the submerged state in the center of the reaction tank 10. The rear of the (10) is provided with a screen 50 for preventing the outflow of the particulate carrier 40, the central portion of the reaction tank 10 is provided with a stirring device 60 for preventing the stagnation of the treated water. .

At this time, the first filter bed carrier (30a) installed in the inlet of the reaction tank (10) of the filter bed carrier 30 to the largest form and gradually decreases toward the rear of the filter bed carrier (30b) (30c). By forming (30n) it is possible to simultaneously handle the suspended matter without passing through the settling tank in the front of the reaction tank (10).

At this time, when the last filter bed carrier (30n) installed in the outlet of the reaction tank 10 to cover the upper end and the lower end of the reaction tank 10, as shown in Figure 3 and 4, the particulate carrier 40 In order to prevent leakage, the screen 50 may be installed at the same time, so the separate installation of the screen 50 is not necessary.

In addition, the bottom of the reaction tank 10 has an inclined surface 11 on one side, so that the diffuser device 20 is provided on the inclined surface 11, even when the particulate carrier 40 sinks. The device 20 facilitates the flow.

On the other hand, Figure 5 and Figure 6 shows another embodiment of the present invention, the filter bed carrier 30 is suspended in the floating body 60, etc. installed in the semi-floating system in the reaction tank 10 to further add a semi-floating biofilm. It can be formed.

This is based on the principle of Rotating Biological Contact (RBC), and because the filtration carrier 30 is eccentric and rotates according to the fluid flow in the water and aeration caused by underwater flow and aeration without a separate power source. In addition to aerobic microorganisms as well as various anaerobic microorganisms inside the environment can be created to provide a habitat for a variety of microorganisms, it is resistant to the load fluctuations of the reaction tank (10) and when a large amount of desorption of the fixed-phase biofilm, There is a feature that can maintain the concentration of microorganisms by adding.

In addition, the present invention can be applied to both a continuous flow or a batch reaction tank, it is possible to vary the inflow and outflow direction of the treated water.

Therefore, the treatment apparatus of the present invention configured as described above is capable of simultaneously forming a fixed bed biofilm by the filter carrier 30 and a fluid bed biofilm by the particulate carrier 40 in one reactor 10. When the wastewater is treated by using, the particulate carrier 40 is formed between the filter carriers 30 so as to flow up, down, left, and right of the particulate carrier 40, so that the fluidized biofilms collide with each other and collide with the fixed bed biofilm. Not only can the MLSS concentration of the fluidized bed biofilm be kept constant, but also the overgrowth of the fixed bed biofilm can be suppressed, which can delay and prevent external clogging, and prevent the fluidized bed biofilm from flowing out by the fixed bed biofilm. It can be used to complement each disadvantage.

In addition, it is possible to filter the suspended solids and sludge by the fixed bed biofilm, the advantage of the fixed bed biofilm that does not require a separate treatment device, such as a sedimentation tank for processing it, the formation time of the biofilm is short, the air injected from the air diffuser 20 Since the collision with the particles can break up the air particles to increase the oxygen transfer efficiency, the advantages of the fluidized biofilm with short processing time can be combined to obtain the advantages of doubled.

As described above, the present invention can be solved by complementing each of the disadvantages by simultaneously using two different biofilms having different advantages and disadvantages in one reactor, and each advantage is doubled to reduce the economic burden while reducing the treatment efficiency. Wastewater treatment using biofilms that can be maximized is enabled.

Therefore, it secures the diversity of microbial species, so it is strong against the impact of hydraulics, organics and toxic substances, and the capacity of sedimentation tank is small due to the generation of small excess sludge, the structure of the device is simple, maintenance is easy, and sludge transportation is unnecessary. The composition of two biofilms enables denitrification under aerobic conditions, and the detachment and attachment of biofilms is easy due to the collision of fluid carriers, so that the MLSS concentration of the biofilms can be kept constant. Would be possible.

Claims (7)

A wastewater treatment method using a biofilm, comprising: a fixed biofilm and a fluidized biofilm formed inside a single reaction tank operated in an aerobic state to treat wastewater and wastewater. The advanced treatment method for wastewater and wastewater using a biofilm according to claim 1, wherein a semi-floating biofilm is further formed in a reaction tank in which the fixed bed biofilm and the fluidized bed biofilm are formed. The filter device carrier 30 is arranged in a fixed state inside the reaction tank 10 which is provided with an acidic device 20 to operate in an aerobic state to form a fixed bed biofilm, and the particulate carrier between the listed filter carriers 30. (40) is formed to form a fluidized biofilm by the air particles injected from the air diffuser (20), the advanced treatment device for wastewater and wastewater using a biofilm. 4. An advanced treatment apparatus for wastewater and wastewater using a biofilm according to claim 3, wherein a part of said filtration carrier (30) is fixed to a floating body to form a semi-floating system. The method of claim 3 or 4, wherein the first filtration carrier (30a) installed in the inlet of the reaction tank 10 is formed in the form of the largest and gradually decreases to the rear form using a biofilm Advanced Wastewater Treatment System. The method of claim 3 or 4, wherein the last filter bed carrier 30n provided in the outlet of the reaction tank 10 is formed so as to span the upper end and the lower end of the reaction tank 10. Advanced Wastewater Treatment System. 5. The biofilm using a biofilm according to claim 3 or 4, wherein the bottom of the reaction tank 10 is formed with an inclined surface 11 on one side, and an air diffuser 20 is provided on the inclined surface 11. Advanced Wastewater Treatment System.