CN210915499U

CN210915499U - Activated sludge screening device for sewage treatment

Info

Publication number: CN210915499U
Application number: CN201921437883.7U
Authority: CN
Inventors: 郭庆
Original assignee: Chengdu Taizhiyuan Environmental Science And Technology Co ltd
Current assignee: Chengdu Taizhiyuan Environmental Science And Technology Co ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-07-03
Anticipated expiration: 2029-08-30

Abstract

The utility model relates to the field of sewage treatment, and discloses an activated sludge screening device for sewage treatment, which comprises a water inlet, a water retaining device, a sedimentation tank, a water outlet weir and a water outlet, wherein the bottom of the sedimentation tank is sequentially provided with a plurality of mud hoppers, and the outer side of the sedimentation tank is provided with a sludge discharge pipeline; the two ends of the sludge discharge pipeline are respectively provided with a sludge reflux pump and a sludge discharge pump, a plurality of sludge discharge branch pipes which are respectively communicated with the bottoms of the sludge hoppers are butted on the sludge discharge pipeline between the sludge reflux pump and the sludge discharge pump, and valves are arranged on the sludge discharge branch pipes. The utility model provides a current sedimentation tank lack activated sludge screening device, lead to ageing mud to flow back to the aeration tank along with activated sludge together to cause the increase of mud backward flow volume, the energy consumption increases, the problem that sewage treatment of sewage system efficiency reduces.

Description

Activated sludge screening device for sewage treatment

Technical Field

The utility model relates to a sewage treatment field specifically indicates an activated sludge screening device for sewage treatment.

Background

The activated sludge process is an aerobic biological treatment method for sewage, and nowadays, the activated sludge process and a derivative improved process thereof are the most widely used methods for treating urban sewage. It can remove soluble and colloidal biochemical organic substances, suspended solids and other substances adsorbed by activated sludge from sewage, and can remove a part of phosphorus and nitrogen, and is a general name of various methods for biologically treating microorganisms suspended in water by wastewater.

The typical activated sludge process consists of an aeration tank, a sedimentation tank, a sludge recirculation system and a surplus sludge removal system. The sewage and the returned activated sludge enter an aeration tank together to form mixed liquor. The aeration tank is a bioreactor, compressed air sent by an air compressor station is introduced into sewage in the form of fine bubbles through an air diffusion device paved at the bottom of the aeration tank, so that the content of dissolved oxygen in the sewage is increased, and mixed liquid is in a state of violent stirring and is in a suspension state. The dissolved oxygen, the activated sludge and the sewage are mixed and fully contacted with each other, so that the activated sludge reaction can be normally carried out.

In the first stage, organic pollutants in the sewage are adsorbed on the surfaces of zooglea by activated sludge particles due to the huge specific surface area of the zooglea and the action of polysaccharide viscous substances, and meanwhile, some active macromolecular organic matters are decomposed into micromolecular organic matters under the action of bacterial extracellular enzymes. In the second stage, the microorganisms absorb the organic matters under the condition of sufficient oxygen, and the organic matters are oxidized and decomposed to form carbon dioxide and water, and part of the carbon dioxide and water are supplied to the microorganisms for self proliferation and multiplication.

As a result of the activated sludge reaction, organic pollutants in the sewage are degraded and removed, the activated sludge itself is multiplied and increased, and the sewage is purified. The mixed liquid after the purification action of the activated sludge enters a secondary sedimentation tank, the suspended activated sludge and other solid matters in the mixed liquid are precipitated and separated from water, and the clarified sewage is discharged out of the system as treated water. And the sludge concentrated by sedimentation is discharged from the bottom of the sedimentation tank, and most of the sludge is taken as inoculation sludge and flows back to the aeration tank so as to ensure the concentration of suspended solids and the concentration of microorganisms in the aeration tank. The proliferated microorganisms are discharged from the system and are called "excess sludge", and in fact, the contaminants are largely transferred from the sewage to these excess sludge.

However, the sludge which is returned after sedimentation in the sedimentation tank, in addition to the activated sludge, is partially aged and aged sludge lacking active microorganisms, and enters the aeration tank together with the activated sludge. Therefore, in order to ensure the concentration of suspended solids and the concentration of microorganisms in the aeration tank, the amount of sludge return flow must be increased, thereby increasing energy consumption. And the sewage treatment efficiency of the whole sewage system is reduced due to the interference of aged sludge.

SUMMERY OF THE UTILITY MODEL

Based on above technical problem, the utility model provides an activated sludge screening device for sewage treatment has solved current sedimentation tank and has lacked activated sludge screening device, leads to ageing mud to flow back to aeration tank along with activated sludge together to cause the increase of mud backward flow volume, the energy consumption increases, the problem that sewage treatment of sewage system efficiency reduces.

For solving the above technical problem, the utility model discloses a technical scheme as follows:

an activated sludge screening device for sewage treatment comprises a water inlet, a water retaining device, a sedimentation tank, a water outlet weir and a water outlet, wherein a plurality of mud hoppers are sequentially arranged at the bottom of the sedimentation tank, and a sludge discharge pipeline is arranged outside the sedimentation tank; the two ends of the sludge discharge pipeline are respectively provided with a sludge reflux pump and a sludge discharge pump, a plurality of sludge discharge branch pipes which are respectively communicated with the bottoms of the sludge hoppers are butted on the sludge discharge pipeline between the sludge reflux pump and the sludge discharge pump, and valves are arranged on the sludge discharge branch pipes.

The utility model discloses in, the principle of carrying out the mud screening is: bacteria in the activated sludge secrete polysaccharide substances to coat the bacteria into sticky masses, so that the zoogloea is formed. The zoogloea is the main component of the activated sludge flocculating constituent and has good coagulation and sedimentation performance. And after the muddy water mixed liquid enters the sedimentation tank from the water inlet assembly, sludge in the muddy water mixed liquid performs free falling motion. The sedimentation performance is good, and the activated sludge with younger mud age can be more easily settled down because the activated sludge contains more zoogloea, and is settled near the first mud bucket close to the water inlet. Similarly, along with the gradual reduction of the content of zoogloea of the sludge, the sedimentation performance of the sludge is continuously deteriorated, the sludge can be settled into different mud hoppers according to the content of the zoogloea, and the aged sludge with the least content of the zoogloea and the worst sedimentation performance can be settled into the mud hopper at the tail end far away from the water inlet.

When activated sludge is required to flow back, the valve of the sludge discharge branch pipe of the first sludge hopper is opened, the valves of the other sludge discharge branch pipes are closed, and the sludge reflux pump is started to reflux the activated sludge settled in the first sludge hopper into the aeration tank. Since the active microorganism content in the active sludge in the first hopper is the highest, the amount of sludge required to reach the suspended solids concentration and microorganism concentration in the aeration tank can be reduced. Thereby reducing the sludge reflux amount, reducing the energy consumption and improving the sewage treatment efficiency of the whole sewage system.

When sludge in the sedimentation tank needs to be discharged, the valves of the sludge discharge branch pipes of the sludge buckets at the tail ends are opened, the valves of the other sludge discharge branch pipes are closed, the sludge discharge pump is started, and aged sludge settled in the sludge buckets at the tail ends is discharged preferentially. Therefore, the sedimentation and collection of the activated sludge are not influenced, and the aged sludge which is easy to float upwards can be discharged preferentially, so that the water quality in the sedimentation tank becomes better.

Except the above situation, when needing to flow back or discharge more mud, because the microorganism content of subsiding mud in the bagger reduces from right to left in proper order, can flow back mud from right to left in proper order according to required mud backward flow volume, arrange mud outward in proper order from left to right according to required mud outer discharge capacity, thereby utilize the segmentation to arrange mud and optimize the processing and the use to subsiding mud.

Preferably, the water retaining device is of a plate-shaped structure, and is hung above the mud bucket and extends into the sedimentation tank.

Preferably, the effluent weir comprises an effluent weir plate and an effluent groove formed by the effluent weir plate and the inner wall of the sedimentation tank in a surrounding manner, and the water outlet is communicated with the effluent groove.

In a preferred mode, the effluent weir plate is a sawtooth-shaped triangular weir.

As a preferable mode, a scum baffle is arranged in front of the effluent weir.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model provides a current sedimentation tank lack activated sludge screening device, lead to ageing mud to flow back to the aeration tank along with activated sludge together to cause the increase of mud backward flow volume, the energy consumption increases, the problem that sewage treatment of sewage system efficiency reduces.

(2) The utility model discloses a water retaining device is platelike structure, and water retaining device hangs inside the mud bucket top and stretch into the sedimentation tank. The water retaining device can guide the water inlet into the water tank, so that the water inlet can stably enter the sedimentation tank.

(3) The utility model discloses an play mill weir includes the play mill weir board and goes out the mill weir board and encloses the play basin that forms with the inner wall of sedimentation tank, delivery port and play basin intercommunication. The effluent weir can ensure that the effluent is uniform, and can intercept sludge and reduce effluent impurities.

(4) The utility model discloses a go out the water weir plate and be zigzag triangle weir plate, zigzag triangle weir plate is the most general play water weir plate of application, has simple structure, the steady characteristics of effect.

(5) The utility model discloses a be equipped with the dross baffle before going out the water weir, the dross baffle can prevent that surface dross is discharged along with the play water, guarantees out water quality of water, also can assemble the dross, is convenient for unified the processing.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic side view of the present invention.

The system comprises a water outlet 1, a scum baffle 2, a sedimentation tank 3, a mud bucket 4, a water retaining device 5, a water inlet 6, a sludge reflux pump 7, a valve 8, a mud discharge branch pipe 9, a sludge discharge pipeline 10, a sludge discharge pump 11, a water outlet weir plate 12 and a water outlet groove 13.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Example 1:

referring to fig. 1-2, an activated sludge screening device for sewage treatment comprises a water inlet 6, a water retaining device 5, a sedimentation tank 3, a water outlet weir and a water outlet 1, wherein a plurality of mud hoppers 4 are sequentially arranged at the bottom of the sedimentation tank 3, and a sludge discharge pipeline 10 is arranged outside the sedimentation tank 3; the two ends of the sludge discharge pipeline 10 are respectively provided with a sludge reflux pump 7 and a sludge discharge pump 11, the sludge discharge pipeline 10 between the sludge reflux pump 7 and the sludge discharge pump 11 is butted with a plurality of sludge discharge branch pipes 9 respectively communicated with the bottoms of the sludge hoppers 4, and the sludge discharge branch pipes 9 are respectively provided with a valve 8.

In this embodiment, the principle of sludge screening is as follows: bacteria in the activated sludge secrete polysaccharide substances to coat the bacteria into sticky masses, so that the zoogloea is formed. The zoogloea is the main component of the activated sludge flocculating constituent and has good coagulation and sedimentation performance. After the muddy water mixed liquid enters the sedimentation tank 3 from the water inlet assembly, sludge in the muddy water mixed liquid makes free falling body movement. The sedimentation performance is good, and the activated sludge with younger age sludge is easier to settle down because the activated sludge contains more zoogloea and settles near the first mud bucket 4 close to the water inlet 6. Similarly, as the content of zoogloea of the sludge is gradually reduced, the sedimentation performance of the sludge is continuously deteriorated, the sludge can be settled into different mud hoppers 4 according to the content of the zoogloea, and the aged sludge with the least zoogloea content and the worst sedimentation performance can be settled into the mud hopper 4 at the tail end far away from the water inlet 6.

When activated sludge is required to flow back, the valve 8 of the sludge discharge branch pipe 9 of the first sludge hopper 4 is opened, the valves 8 of the other sludge discharge branch pipes 9 are closed, and the sludge return pump 7 is started to return the activated sludge settled in the first sludge hopper 4 to the aeration tank. Since the activated sludge in the first hopper 4 has the highest content of active microorganisms, the amount of sludge required to reach the concentration of suspended solids and the concentration of microorganisms in the aeration tank can be reduced. Thereby reducing the sludge reflux amount, reducing the energy consumption and improving the sewage treatment efficiency of the whole sewage system.

When sludge in the sedimentation tank 3 needs to be discharged, the valves 8 of the sludge discharge branch pipes 9 of the sludge bucket 4 at the tail end are opened, the valves 8 of the other sludge discharge branch pipes 9 are closed, the sludge discharge pump 11 is started, and aged sludge settled in the sludge bucket 4 at the tail end is preferentially discharged. Therefore, the sedimentation and collection of the activated sludge are not influenced, and aged sludge which is easy to float upwards can be discharged preferentially, so that the water quality in the sedimentation tank 3 is better.

Except the above situation, when more sludge needs to be returned or discharged, because the microbial content of the settled sludge in the hopper 4 is reduced from right to left in sequence, the sludge can be returned from right to left in sequence according to the required sludge return flow, the sludge is discharged from left to right in sequence according to the required sludge external discharge capacity, and thus the treatment and the use of the settled sludge are optimized by utilizing the sectional sludge discharge.

Example 2:

Further, the water retaining device 5 is of a plate-shaped structure, and the water retaining device 5 is hung above the mud bucket 4 and extends into the sedimentation tank 3. The water retaining device 5 can guide the water entering from the water inlet 6 to enable the water to stably enter the sedimentation tank 3.

Further, the water outlet weir comprises a water outlet weir plate 12 and a water outlet groove 13 formed by the water outlet weir plate 12 and the inner wall of the sedimentation tank 3 in a surrounding manner, and the water outlet 1 is communicated with the water outlet groove 13. The effluent weir can ensure that the effluent is uniform, and can intercept sludge and reduce effluent impurities.

Furthermore, the water outlet weir plate 12 is a saw-tooth triangular weir plate, which is the most commonly used water outlet weir plate 12, and has the characteristics of simple structure and stable effect.

Furthermore, a scum baffle 2 is arranged in front of the effluent weir, and the scum baffle 2 can prevent surface scum from being discharged along with effluent, so that the effluent quality is ensured, scum can be gathered, and uniform treatment is facilitated.

The other parts of this embodiment are the same as embodiment 1, and are not described herein again.

The embodiment of the present invention is the above. The above embodiments and the specific parameters in the embodiments are only for the purpose of clearly showing the verification process of the utility model, and are not used to limit the patent protection scope of the utility model, the patent protection scope of the utility model is still subject to the claims, all the equivalent structural changes made by using the contents of the specification and the drawings of the utility model are included in the protection scope of the utility model.

Claims

1. The utility model provides an activated sludge sieving mechanism for sewage treatment, includes water inlet (6), water retaining device (5), sedimentation tank (3), play mill weir and delivery port (1), its characterized in that: a plurality of mud hoppers (4) are sequentially arranged at the bottom of the sedimentation tank (3), and a sludge discharge pipeline (10) is arranged outside the sedimentation tank (3); the sludge discharge device is characterized in that two ends of the sludge discharge pipeline (10) are respectively provided with a sludge reflux pump (7) and a sludge discharge pump (11), a plurality of sludge discharge branch pipes (9) which are respectively communicated with the bottoms of the mud hoppers (4) are butted on the sludge discharge pipeline (10) between the sludge reflux pump (7) and the sludge discharge pump (11), and valves (8) are arranged on the sludge discharge branch pipes (9).

2. The activated sludge screening apparatus for wastewater treatment according to claim 1, wherein: the water retaining device (5) is of a plate-shaped structure, and the water retaining device (5) is hung above the mud bucket (4) and extends into the sedimentation tank (3).

3. The activated sludge screening apparatus for wastewater treatment according to claim 1, wherein: the water outlet weir comprises a water outlet weir plate (12) and a water outlet groove (13) formed by the water outlet weir plate (12) and the inner wall of the sedimentation tank (3) in a surrounding manner, and the water outlet (1) is communicated with the water outlet groove (13).

4. The activated sludge screening apparatus for wastewater treatment as set forth in claim 3, wherein: the water outlet weir plate (12) is a sawtooth-shaped triangular weir.

5. The activated sludge screening apparatus for wastewater treatment as set forth in claim 3, wherein: a scum baffle (2) is arranged in front of the water outlet weir (12).