CN201842738U - Integrated AO sewage treatment device - Google Patents

Abstract

The utility model discloses an integrated AO sewage treatment device, which is formed by connecting an anaerobic pond, a contact oxidation tank and a sedimentation basin together. The anaerobic pond and the contact oxidation tank are arranged longitudinally, thus a small floor space is occupied; and the sedimentation basin combines vertical flow sedimentation with inclined plate sedimentation, therefore the efficiency of sedimentation is high. The device can use upward current and hydrostatic pressure which are generated by aeration at aerobic stage to reflux sewage and sludge; by a sludge display tube arranged in front of a mud valve, the device can intuitively control reflux of the sludge, maintain a special micro ecological environment, thereby having perfect impact resistance.

Description

Integrated AO sewage treatment device

technical field

The utility model relates to an integrated AO sewage treatment device.

Background technique

At present, the well-known AO process, that is, anaerobic aerobic process, A (Anacrobic) is an anaerobic stage, used for nitrogen and phosphorus removal; O (Oxic) is an aerobic stage, used to remove organic matter in water. The process is simple, no additional carbon source and post-aeration tank are required, raw sewage is used as the carbon source, and the construction and operation costs are relatively low. Generally, the AO process adopts a horizontal flow arrangement, so the facility occupies a large area. In addition, since there is no independent sludge return system, sludge with unique functions cannot be cultivated, and the degradation rate of refractory substances is low. If the sludge in the subsequent sedimentation tank is returned, a sludge return pump must be installed. Thus increasing operating costs.

Contents of the invention

In order to overcome the shortcomings of the existing AO process using sludge pumps for reflux and the large area of the facility, the utility model provides an integrated AO sewage treatment device. The anaerobic tank and the contact oxidation tank of the device are vertically arranged, occupying an area The area is small, and it has the methane production function of the UASB process. The sedimentation tank adopts the combination of vertical flow sedimentation and inclined plate sedimentation, and the sedimentation efficiency is high. At the same time, the upflow and hydrostatic pressure generated by the aerobic stage aeration can be used to return the sludge. .

An integrated AO sewage treatment device provided by the utility model is composed of an anaerobic tank 1, a contact oxidation tank 2 and a sedimentation tank 3; Installed in the middle of the anaerobic tank 1, the gas collecting pipe 6 and the water inlet pipe 5 below it are respectively installed on the anaerobic tank 1 wall near the sedimentation tank 3 side; the contact oxidation tank 2 is located above the anaerobic tank 1, and the two Those are separated by gas collecting plate 8, the aeration tube 9 equipped with ceramic microporous aeration head 10 is installed above the gas collecting plate 8, elastic packing 11 is installed above the aeration tube 9 in the contact oxidation tank 2; The water outlet side of the pool 2 is connected to the sedimentation tank 3, the water inlet of the sedimentation tank 3 is installed with a diversion baffle 12 and a reflector 13, the inclined pipe 14 is installed in the upper part of the sedimentation tank 3, and the outlet of the sedimentation tank 3 is an overflow tank 15. The position of the overflow tank 15 is lower than the water inlet of the sedimentation tank 3, and the display pipe 16, the sludge discharge valve 17 and the return pipe 18 connected to the bottom of the sedimentation tank 3 in sequence are connected to the anaerobic tank 1.

The effective volume ratio of the above-mentioned anaerobic tank 1 and the contact oxidation tank 2 is about 1:3.

The above-mentioned gas collecting plate 8 is simultaneously a mud collecting bucket contacting the oxidation tank 2, and the inclination angle of its surface relative to the horizontal plane is 5°.

The distance between the above-mentioned aeration pipe 9 and the surface of the gas collecting plate 8 is ≥0.3m.

The elastic filler 11 is made of high molecular weight polyethylene.

The gap between the lower end of the above-mentioned guide baffle 12 and the surface of the reflection plate 13 is 0.25-0.5m.

The inclination angle of the upper surface of the above-mentioned reflection plate 13 relative to the horizontal plane is 17°, the bottom surface of the reflection plate 13 is ≥0.3m away from the mud surface of the sedimentation tank, and its width is 1.35 times of the distance between the diversion baffle plate 12 and the wall surface of the sedimentation tank.

The above-mentioned sludge display tube 16 is made of transparent glass fiber reinforced plastic, which can control the sludge backflow more intuitively.

The above-mentioned return pipe 18 utilizes the upflow and hydrostatic pressure generated by the aeration of the contact oxidation tank 2 to realize the sludge return.

The technical solution adopted by the utility model is an integrated AO sewage treatment device including an anaerobic tank, a contact oxidation tank and a sedimentation tank. The anaerobic tank and the contact oxidation tank are vertically arranged, with the anaerobic tank on the bottom and the contact oxidation tank on the top. In order to reasonably control the hydraulic retention time, the effective volume ratio of the anaerobic tank and the contact oxidation tank is about 1:3. At the initial stage of device start-up, an appropriate amount of fly ash is first added to the contact oxidation tank, and the fly ash can enter the anaerobic tank through the sludge outlet (also the water inlet) of the contact oxidation tank, as a growth carrier for anaerobic bacteria, and promote For the formation of initial granular sludge, the agitator can promote the separation of sewage and activated sludge; when each pool is full of water for operation and commissioning, open the sludge discharge valve of the sedimentation tank, and contact the oxidation tank for aeration to drive water flow, and at the same time due to contact oxidation There is a density difference between the gas-water mixed waste liquid in the pool and the treated water in the sedimentation tank, and the waste water can be circulated in the three pools under the hydrostatic pressure. When the device is running normally, because the biofilm in the contact oxidation tank starts to be replaced, a large number of aging biofilms continue to fall off, and the ones with a larger proportion directly fall back to the anaerobic tank through the sludge outlet (also the water inlet). This process has a great impact on the influent Pollutants have the function of interception and filtration, and bring them back to the anaerobic tank; those with smaller specific gravity enter the sedimentation tank with the water flow and settle into the mud bucket. When the aged biofilm in the mud bucket accumulates to a certain extent, due to long-term In the oxygen state, the aging biofilm begins to turn black, and anaerobic sludge is gradually formed. At this time, the sludge can be refluxed. When the sludge returns, first stop the water intake, and then open the sludge discharge valve. Also under the action of the aeration upflow and hydrostatic pressure in the contact oxidation tank, the sludge can be pressed back to the anaerobic tank, and the sludge can be observed through the transparent sludge display tube. The sludge backflow can be controlled more intuitively according to the sludge color. When the organic load is too high, the amount of water inflow can be reduced, and the sludge discharge valve of the sedimentation tank can be continuously opened to realize the return of sewage and improve the speed of returning to normal operation of the system. After long-term operation, the anaerobic pond begins to produce methane, which can be used when the biogas in the gas collection chamber accumulates to a certain extent.

The beneficial effects of the utility model are:

1. The anaerobic tank of the utility model is vertically connected with the contact oxidation tank, and the sedimentation tank is vertical flow combined with inclined tube sedimentation, which has good treatment effect and less floor space;

2. The anaerobic tank can form a fairly stable biological phase and maintain a specific micro-ecological environment. The flocs have good sedimentation performance, thereby increasing the sludge concentration in the tank, and at the same time play an anaerobic filtering role for sewage, so it is suitable for high The decomposition effect of molecular refractory substances is remarkable.

3. It has a gas collection chamber, which can use the produced biogas. Since the gas collection chamber is located in the lower part of the whole pool, the pressure is high and it is not easy to generate foam;

4. The gas collecting plate is also the mud bucket of the contact oxidation tank. When the system is in normal operation, the aging biofilm with good settlement performance can be used as sludge to return to the anaerobic tank, and at the same time, it can filter the rising water;

5. When the sludge in the sedimentation tank returns, first stop the water inlet, and then open the sludge discharge valve. Under the action of the aeration upflow and hydrostatic pressure in the contact oxidation tank, the sludge can be pressed back to the anaerobic tank, so there is no need to install sludge The reflux pump can realize sludge reflux, save energy, and at the same time, can cultivate sludge with unique functions. The reflux sludge can be further decomposed, which can reduce the amount of remaining sludge and improve the degradation rate of refractory substances.

6. The sludge display tube is made of transparent glass fiber reinforced plastic, which can more intuitively understand the sludge return situation and is easy to operate.

Description of drawings

Fig. 1 is the structural representation of the utility model device.

Detailed ways

Below, the utility model is further described in conjunction with accompanying drawing:

Figure 1 shows an integrated AO sewage treatment device, including anaerobic tank 1, contact oxidation tank 2 and sedimentation tank 3. The anaerobic tank 1 and the contact oxidation tank 2 are vertically arranged, the anaerobic tank is on the bottom, and the contact oxidation tank is on the top. The effective volume ratio is about 1:3, separated by a gas collecting plate 8 in the middle, and the surface of the gas collecting plate 8 faces the horizontal plane The inclination angle is 5°. The mud discharge pipe 4 is installed at the bottom of the anaerobic tank 1, the agitator 7 is installed in the middle, and the water inlet pipe 5 and the gas collecting pipe 6 are arranged on the side of the anaerobic tank 1 close to the sedimentation tank 3. Elastic packing 11 is housed in contact oxidation tank 2, and elastic packing 11 is high molecular polyethylene material, and aeration pipe 9 equipped with ceramic microporous aeration head 10 is installed above gas collecting plate 8. The outlet side of the contact oxidation tank 2 is connected to the sedimentation tank 3. The sedimentation tank 3 adopts the combination of vertical flow sedimentation and inclined tube sedimentation, and the inclined pipe 14 is installed inside. The height of the gap between the lower end of the plate 12 and the surface of the reflector is 0.25-0.5m, the distance between the bottom of the reflector 13 and the mud surface is ≥0.3m, the width is 1.35 times the distance between the diversion baffle 12 and the wall, and the water outlet is an overflow tank 15. The mud hopper of the sedimentation tank 3 is connected to the anaerobic tank 1 through the sludge display pipe 16, the sludge discharge valve 17 and the return pipe 18 in sequence, wherein the sludge display pipe 16 is made of transparent glass fiber reinforced plastic.

Claims (6)

1. integrated A/O waste disposal plant, it is characterized in that: this device is interconnected by anaerobic pond (1), contact-oxidation pool (2) and settling tank (3) to be formed; The bottom extreme lower position of described anaerobic pond (1) is installed shore pipe (4), and agitator (7) is installed in the centre of anaerobic pond (1), and the water inlet pipe (5) of effuser (6) and below thereof is installed in anaerobic pond (1) the wall limit near settling tank (3) one sides respectively; Described contact-oxidation pool (2) is positioned at anaerobic pond (1) top, both separate with gas collection plate (8), the aeration tube (9) that ceramic capillary aeration head (10) are housed is installed in gas collection plate (8) top, and aeration tube (9) top in the contact-oxidation pool (2) is equipped with elastic filler (11); One side of contact-oxidation pool (2) water outlet connects settling tank (3), flow apron (12) and reflector (13) are installed in the water inlet of settling tank (3), inclined tube (14) is installed in the top in the settling tank (3), settling tank (3) water outlet place is overflow groove (15), the position of overflow groove (15) is lower than the water-in of settling tank (3), and the typotron (16) that the bottom extreme lower position of settling tank (3) connects successively, mud valve (17) and return line (18) link to each other with anaerobic pond (1).

2. device according to claim 1 is characterized in that: above-mentioned anaerobic pond (1) is 1: 3 with the useful volume ratio of contact-oxidation pool (2).

3. device according to claim 1 is characterized in that: above-mentioned gas collection plate (8) is the sludge hopper of contact-oxidation pool (2) simultaneously, and its surface inclination angle of horizontal plane relatively is 5 °.

4. device according to claim 1 is characterized in that: the surface distance 〉=0.3m of above-mentioned aeration tube (9) and gas collection plate (8).

5. device according to claim 1 is characterized in that: the slit between the lower end of above-mentioned flow apron (12) to reflector (13) surface is 0.25～0.5m.

6. device according to claim 1, it is characterized in that: the inclination angle of the relative horizontal plane of upper surface of said reflection plate (13) is 17 °, the bottom surface of reflector (13) is apart from settling tank mud face 〉=0.3m, and its width is flow apron (12) and settling tank wall distance 1.35 times.

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