KR0160507B1 - Sewage and waste water treatment - Google Patents

Abstract

The present invention relates to a treatment method for biofilm treatment in high-rate anaerobic digestion tanks and aerobic aeration tanks in wastewater and manure treatment facilities.

Conventionally, in the case of wastewater and manure treatment, granular media were installed in the anaerobic digestion tank and aerobic aeration tank in order to shorten the treatment efficiency and treatment time, but there was a problem in that the treatment efficiency was reduced or the operation was impossible due to operational problems. .

Therefore, in the present invention, after the inflow water is mixed with the return liquid for mixing the sludge, it is adjusted to an appropriate temperature through the heat exchanger (7), and then injected into the primary digestion tank (1), which is primarily used by microorganisms attached to the biological medium (3). After the treatment is finally processed in the secondary digester (2) through the upper central pipe, the sludge produced at this time is collected by the RAKE (4, 5) to the central cone (CONE) area, which is The scum (SKUM), which is returned to the primary digester (1) by the broadcast pumps (6, 8) and floated on the upper part of the secondary digester (2), is scum hopper (HOPPER) by the skimmer (SKIMME) (10). In the anaerobic treatment process, granular media was used for both anaerobic digestion tanks and aerobic aeration tanks, and in the anaerobic treatment process, biological media were placed in wire meshes or threaded into supports to increase processing efficiency. Inside the aeration tank during aerobic treatment Since the biological media is installed with a specific gravity difference with the lower space, the treatment effect is somewhat different depending on the type of sewage, but the treatment efficiency is more than 50% compared to the conventional one, and the facility cost is also reduced by 30-50%. In this case, the power cost is also reduced to less than 1/3.

Description

Wastewater and Manure Treatment Methods

The present invention relates to a wastewater and manure treatment method for biofilm treatment in a high-rate anaerobic digester and aerobic aeration tank in wastewater and manure treatment facilities.

Conventionally, in the case of wastewater and manure treatment, granular media were installed in the anaerobic digestion tank and aerobic aeration tank in order to shorten the treatment efficiency and treatment time. There is a need for a way to complement the problem.

The problems of the prior art caused by the use of granular media in anaerobic digesters or aerobic aeration tanks are as follows.

1) When used in anaerobic digesters

end. In order to increase the contact efficiency between the attached microorganisms and the influent, an attempt was made to stir the digestive gas or the stirrer to fluidize the granular medium, but this was not smooth and the granular medium was immobilized in any part. The formation of zones) reduced the volume of the tank and shorted the inlet water (SHORT CIRCULT), resulting in a decrease in the treatment efficiency, which made the operation impossible.

I. If any part of the group causes an abnormal phenomenon, it is difficult to manage the maintenance because the whole media must be removed from the group.

All. The sludge attached to the medium is temporarily dropped due to shock due to instantaneous changes in operating conditions (pH, temperature, organic load, interferences (heavy metals, oils, phenols, etc.), agitation, etc.). It is hard to take action when it is done.

2) When used in aerobic digestion tanks or aerobic aeration tanks

end. The fluidized bed is not maintained when the granular medium is fluidized by the air injected from the lower part of the tank. Part of the tank is dead-dead, and the capacity of the tank is reduced and an anaerobic zone (ZONE) is formed.

I. Repair is difficult because the granular media must be removed for repair when a failure of the air diffuser installed at the bottom of the tank is caused.

All. When more than 40-50% of a single medium of the same size and specific gravity is injected into the bath, a normal fluidized bed cannot be maintained.

If the specific gravity of the medium is 1 or more, it is precipitated in the bottom of the tank and does not become a fluidized bed. If the specific gravity is less than 1, the ancestor is not a fluidized bed, and the media floats out of the tank.

la. Even when the medium is small and the injection rate is high, it is difficult to maintain a normal fluidized bed.

hemp. Most of the media that have been developed and used so far use the media used in gas absorption towers as they are. Conditions are inefficient.

Therefore, in the present invention, anaerobic digestion tanks or aerobic aeration tanks are complemented to avoid the deadening of some of the tanks caused by the problem of swallowing, and also easy to repair in case of failure, in the case of aerobic digestion tanks, the medium forms a normal fluidized bed. The purpose of the present invention is to provide wastewater and manure treatment methods to improve the size, specific gravity and installation method of the medium.

1 is a schematic process flow chart of a high rate anaerobic digester for small to medium capacity treatment using granular media according to the present invention.

2 is a schematic process flow chart of a high rate anaerobic digester for large capacity treatment using particulate media according to the present invention.

3 and 4 are a plan view and a front view for each type of schematically showing a granular medium installation method according to the present invention.

5 to 7 are schematic plan and front views showing the granular medium according to the present invention by type.

8 is an aerobic treatment process chart using granular media for biofilm treatment according to the present invention.

9 and 10 are two front and top views schematically showing a method of installing granular media in the aeration tank of FIG.

* Explanation of symbols for the main parts of the drawings

1: 1st digester 2: 2nd digester

3: biological media 4: primary digestive rake (RAKE)

5: 2nd digestion tank brake 6: 1st digestion tank conveying pump (PUMP)

7: heat exchanger 8: secondary digester conveying pump (PUMP)

9: gas discharge pipe 10: SKIMMER

11: Schimmer hopper (HOPPER) 12: Reducer

13: vacuum gas separator 14: vacuum circulation pump

15: ROLLER 16: RAIL

20: aeration tank 21: sedimentation tank

22: half-small pump 23: underwater underwater equipment

24: diffuser 25: working tool

26: grid

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 shows a process suitable for water treatment containing medium and small volumes of high concentration organic matter, in which the influent is adjusted to an appropriate temperature through a heat exchanger 7 after mixing with a return liquid for sludge mixing. It is injected into the primary digester (1) and is first processed by the microorganisms attached to the biological medium (3) and finally processed in the secondary digester (2) through the upper central pipe.

The sludge generated at this time is collected by the RAKE 4 and 5 to the central cone portion, which is conveyed to the primary digester 1 by the broadcast pumps 6 and 8.

And the scum SKUM which floats on the upper part of the secondary digester 2 is sent to the scum hopper HOPPER 11 by the SKIMMER 10, and is conveyed or removed.

Then, the brakes 4 and 5 and the biological medium 3 are rotated at an appropriate speed by the speed reducer 12 to prevent deadening of the inside of the tank.

The biological filter 3 in the primary digestion tank 1 is placed in the wire mesh cylinder 17 or threaded into a support to achieve a high rate anaerobic treatment process to increase the treatment efficiency.

After the high rate anaerobic treatment process, a lower space is placed inside the aeration tank 20 and the biological filter 3 is installed with a specific gravity difference (lower space) to achieve an aerobic treatment process consisting of a secondary treatment process in which a final treatment is performed.

FIG. 2 illustrates a method suitable for treating sewage containing a large amount of high concentration organic matter, and has the same basic principle as that of FIG. 1, except that the primary digester and the secondary digester are separately installed.

The biological filter (3) is installed in a wire mesh cylinder (CAGE) 17 as shown in FIG. 3 in a fixed manner, and the first is a wire mesh cylinder (17) having a plurality of biological media (3) built in the rotation shaft of the vacuum pump (4) It can be provided with the digester (1) to rotate the wire mesh 17 so that there is no dead portion.

In addition, a plurality of biological media 3 can be sewn on the iron rod 19 to be installed as shown in FIG.

The biological media shown in FIG. 6 is a modification of a representative medium that is mainly used at present, with a slightly larger surface area and a smaller space ratio.

That is, a plurality of circular members 3c are connected along the outer circumferential surface of the shaft flange 3b provided at the center to form the biological medium 3 as a granular medium.

In addition, the upper portion of the circular member (3c) may be formed a plurality of projections (3d) in the horizontal direction in both directions and has a form of forming a support plate (3e) in the interior of the circular member (3c).

The biological filter of FIG. 6 and the biological filter of FIG. 7 are excellent examples when installed in FIGS. 3, 4, and 10. It has been found that the surface area is large and robustly designed compared to the media currently used, so that the treatment efficiency is high and there is no fear of brittleness due to wear during handling and operation.

8 shows a method for treating aerobic biofilm using the granular medium 3. Inflow water flows into the aeration tank 20, and organic matter in the water is treated by microorganisms attached to the medium in the water, and then transferred to the settling tank 21. It is treated after solid-liquid separation.

9 and 10 show schematically two types of aeration tanks 20 suitable for the apparatus as in FIG. When the granular medium 3 is injected into this aeration tank, the structure and physical characteristics of the aeration tank 20 and the granular medium are determined in view of the above-described problems.

1) In order to prevent aeration of the aeration tank, as shown in the drawing, the grid 26 is installed at the bottom of the aeration tank, and a granular medium is installed at the top thereof.

2) Granular media is produced by injecting different specific gravity and size as follows.

end. In the lower part, the granular medium is large and its specific gravity is 1.01-1.03. The shape is considered to be bulky even if the surface is somewhat small, ie, to have a large media space ratio.

I. The middle part of the jaw should be medium in size and have a specific gravity of 0.99-1.01 so that it does not change or float in water. As shown in the paragraph A, use a medium with a small surface area but a large internal space rate (Fig. 5).

All. In the upper part of the jaw, the media is small and the specific gravity is 0.95-0.98, causing the upper part to float. Use at least a large surface area for the shape (Figures 6 and 7 apply media).

la. And all forms and structures of the media are not tangled with each other and do not break well.

The results of the biofilm treatment in anaerobic digestion tanks and aerobic aeration tanks have proven to improve the treatment efficiency.

As described above, however, the use has been restricted due to problems in use.

The present inventors have also used wastewater treatment to treat the wastewater, but it is confirmed that there are the above-mentioned problems, and the present invention has been created to improve such problems.

In the present invention, the media of FIGS. 1 and 7 may vary the shape and number of the attachment plates. For example, it should be noted that the attachment plate may be alternately the uneven plate and the flat plate, and only one side may be the uneven plate and the other side may be the flat plate.

The present inventors have used granular media in both anaerobic digestion tanks and aerobic aeration tanks. The treatment effect is somewhat different depending on the type of sewage, but the treatment efficiency is improved by 50% or more.

In addition, facility costs are reduced by 30-50%, and aerobic aeration tanks are expected to reduce power costs by less than one-third.

Claims (1)

In the process of treating wastewater (sewage) by high-rate anaerobic treatment process, after the inflow water is mixed with the return liquid for the sludge mixing, it is adjusted to an appropriate temperature through the heat exchanger (7) and then injected into the primary digester (1). After the first treatment by the microorganisms attached to the biological medium (3) and the final treatment in the secondary digestion tank (2) through the upper central pipe, the sludge (SLUDGE) generated at this time is Rake (4, 5) Collected by the center cone (C0NE), which is conveyed to the primary digester (1) by the conveying pumps (6, 8), and the skimm (SKUM) that floats on the secondary digester (2) In the wastewater treatment (sewage) treatment process through the wastewater treatment process, which is sent to the scum hopper (HOPPER) 11 by the SKIMMER 10 and returned or removed, the biological media in the primary digestion tank 1 are used. (3) a high rate anaerobic treatment process to increase the treatment efficiency by putting in the wire mesh (17) or threaded into the support; After the anaerobic treatment process, the lower space is placed inside the aeration tank 20, and the biological filter 3 is installed with a specific gravity difference (lower space). And manure treatment methods.

Images