CN211946680U - Biodegradation tank for sewage treatment - Google Patents

Abstract

The utility model provides a biodegradation tank for sewage treatment, which comprises a grid well, an adjusting tank and an integrated sewage treatment device which are connected in sequence, wherein the integrated sewage treatment device mainly comprises a sedimentation tank, an anaerobic tank, an anoxic tank and an aerobic membrane tank which are connected in sequence, a plurality of MBR membrane groups are arranged in the aerobic membrane tank, a mixed liquid return pipeline is arranged between the anoxic tank and the anaerobic tank, and a mixed liquid return pipeline is arranged between the aerobic membrane tank and the anoxic tank; the rear part of the aerobic membrane tank is connected with a clean water tank and a sludge storage tank, and the upper part of the sludge storage tank is communicated with a deoxidizing tank. The biodegradation tank for sewage treatment adopts a combined process of an anaerobic tank, an anoxic tank and an aerobic membrane tank, strengthens the denitrification function, optimizes and adjusts the process flow, and sets reflux between the aerobic membrane tank and the anoxic tank as well as between the anoxic tank and the anaerobic tank, so that the system nitrification efficiency is high; the biological treatment capacity of the process is enhanced by the arrangement of the aerobic membrane tank.

Description

Biodegradation tank for sewage treatment

Technical Field

The utility model relates to a degradation pond especially relates to a biological degradation pond for sewage treatment.

Background

With the rise of ultrafiltration membrane technology, the ultrafiltration membrane is rapidly applied to the field of sewage treatment due to stable product performance, good mechanical strength and high filtering precision, for example, a common A/O + MBR process is adopted, namely, a membrane tank is additionally arranged at the downstream of an A/O reaction tank consisting of a traditional anoxic tank and an aerobic tank, and an MBR membrane group is arranged in the membrane tank to enhance the sewage treatment effect, but the MBR membrane group cannot be fully utilized by simply adding the membrane tank, and the sewage treatment gain effect is limited.

Disclosure of Invention

In view of this, the utility model aims at overcoming the defect that exists among the above-mentioned prior art, provides a biodegradable tank for sewage treatment, has carried out optimization and adjustment to process flow, improves sewage treatment's efficiency.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a biodegradation tank for sewage treatment comprises a grid well, an adjusting tank and integrated sewage treatment equipment which are sequentially connected, wherein the integrated sewage treatment equipment mainly comprises a sedimentation tank, an anaerobic tank, an anoxic tank and an aerobic membrane tank which are sequentially connected, a deoxidizing tank is arranged beside the sedimentation tank, a plurality of MBR membrane groups are arranged in the aerobic membrane tank, a mixed liquid backflow pipeline is arranged between the anoxic tank and the anaerobic tank, and a mixed liquid backflow pipeline is arranged between the aerobic membrane tank and the anoxic tank;

connect clean water basin and storage mud pond behind the good oxygen membrane cisterna, the clean water basin is linked together with the product water pipe of MBR membrane group, it is linked together with the sludge pipe of good oxygen membrane cisterna bottom to store up the mud pond, it is equipped with supernatant return line to store up between the supernatant part of mud pond and deoxidation tank.

Furthermore, a coarse grating and a fine grating are sequentially arranged in the grating well.

Further, the bottom of the grid well is provided with a sand setting area.

Further, the bottom of sedimentation tank is equipped with two square hopper-shaped mud buckets that sink, two it has logical mud pipe to sink the intercommunication between the bottom of mud bucket.

Further, the middle part of sedimentation tank is equipped with vertical draft tube, the draft tube hangs in two heavy mud fill junctures, the inside cavity of draft tube, its lower extreme opening part is equipped with vertical flow distribution plate along the diameter.

Furthermore, water distribution pipes are uniformly distributed at the bottoms of the deoxidation tank and the anaerobic tank, and aeration pipes are uniformly distributed at the bottoms of the anoxic tank and the aerobic membrane tank.

Furthermore, a plurality of water distribution holes are formed in the lower side of the water distribution pipe, and the water distribution holes are staggered along the vertical direction at an included angle of 45 degrees;

aeration holes are formed in the lower side of the aeration pipe, and the aeration holes are arranged in a staggered mode along an included angle of 45 degrees with the vertical direction.

Further, the upper end opening part of sedimentation tank is equipped with the triangle weir plate, the triangle weir plate is the square frame shape and encloses and locate the sedimentation tank inner periphery, the one end intercommunication that the triangle weir plate is close to the anaerobism pond has the overflow pipe, the end of overflow pipe lets in the oxygen deficiency pond.

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

(1) according to the biodegradation tank for sewage treatment, the anaerobic tank is added on the basis of A/O + MBR, the combined process of the anaerobic tank, the anoxic tank and the aerobic membrane tank is adopted, the denitrification function is enhanced, the process flow is optimized and adjusted, backflow is arranged between the aerobic membrane tank and the anoxic tank and between the anoxic tank and the anaerobic tank, the interception, growth and propagation of nitrobacteria with slow proliferation are facilitated, and the system nitrification efficiency is high.

(2) The biological degradation tank for sewage treatment provides an environment for microorganisms to absorb organic matters through the arrangement of the aerobic membrane tank, and the biological treatment capacity of the process is enhanced.

(3) According to the biodegradation tank for sewage treatment, microorganisms are completely intercepted in the membrane reactor by the efficient interception effect of the MBR membrane, so that the complete separation of Hydraulic Retention Time (HRT) and Sludge Retention Time (SRT) in the reactor is realized, and the operation control is more flexible and stable.

(4) The biodegradation tank for sewage treatment has the advantages that the concentration of microorganisms in the MBR membrane reactor is high, the impact load resistance is high, the biodegradation tank can operate under high volume load, low sludge load and long sludge age, and the shutdown cost is reduced.

(5) The biodegradation tank for sewage treatment can effectively carry out solid-liquid separation, has good effluent quality, can be directly recycled, realizes sewage recycling, and has the characteristics of low construction and operation cost, standard water quality, convenient management and the like.

(6) The biological degradation tank for sewage treatment has the advantages of high equipment treatment efficiency, small occupied area, simple supporting facilities and low operation and maintenance cost.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

FIG. 1 is a schematic view of the overall structure of a biodegradation tank for sewage treatment according to the present invention;

fig. 2 is a schematic top view of the biodegradation tank for sewage treatment according to the present invention;

FIG. 3 is a schematic view of a cross-sectional structure of a biodegradation tank for sewage treatment in the direction of A-A according to the present invention;

FIG. 4 is a schematic view of a pipeline structure of a biodegradation tank for sewage treatment according to the present invention;

FIG. 5 is an enlarged view of portion A of FIG. 4;

FIG. 6 is a schematic structural view of an aerobic membrane tank of a biodegradation tank for sewage treatment according to the present invention;

fig. 7 is an enlarged view of a portion a in fig. 6.

Description of reference numerals:

1-a septic tank; 2-a grid well; 21-a sand setting area; 22-coarse grating; 23-fine grating; 3-a sedimentation tank; 311-triangular weir plates; 312-an overflow tube; 313-a guide shell; 3131-a splitter plate; 314-mud settling hopper; 315-dredge pipe; 32-a deoxidation tank; 4-an anaerobic tank; 5-anoxic pond; 6-aerobic membrane tank; 61-MBR membrane group; 62-a dosing box; 7-a mud storage pool; 8-a clean water tank; 9-a regulating reservoir; 101-water distribution pipe; 102-an aerator pipe; 103-a medicine feeding pipe; 106-medicine inlet pipe; 108-aeration holes.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The invention will be described in detail with reference to the following examples with reference to the accompanying drawings:

as shown in fig. 1-7, a biodegradation tank for sewage treatment comprises a grid well 2, an adjusting tank 9 and an integrated sewage treatment device which are connected in sequence, the integrated sewage treatment device mainly comprises a sedimentation tank 3, an anaerobic tank 4, an anoxic tank 5 and an aerobic membrane tank 6 which are connected in sequence, so that supernatant of the sedimentation tank 3 flows into the anaerobic tank 3, produced water of the anaerobic tank 4 can enter the anoxic tank 5, produced water of the anoxic tank 5 flows into the aerobic membrane tank 6, a mixed liquid backflow pipeline is arranged between the anoxic tank 5 and the anaerobic tank 4, a mixed liquid backflow pipeline is arranged between the aerobic membrane tank 6 and the anoxic tank 5, a clear water tank 8 and a sludge storage tank 7 are connected behind the aerobic membrane tank 6, the clear water tank 8 is used for storing produced water in a membrane group 61 and has a function of back-cleaning the MBR membrane group 61, the sludge storage tank 7 is used for collecting sludge deposited in the aerobic membrane tank 6, the supernatant after the sludge tank is static flows back to a deoxidation tank 32 area which is separated from the deoxidation tank 32, after the dissolved oxygen amount is reduced to a certain standard, the dissolved oxygen amount and the sewage in the adjusting tank 31 flow into the anoxic tank 5 together, and the sludge in the sludge storage tank 7 is periodically pumped out and then is transported away;

domestic sewage flows into a grid well 2 after being collected, a thick grid and a thin grid are arranged in the grid well 2 and are used for removing thick and large impurities in the sewage in a grading manner, and a sand setting area 21 is arranged at the bottom of the grid well 2 so as to reduce the operation load of subsequent treatment facilities;

after the primary treatment is carried out on the grid well 2, sewage above the sand setting area 21 in the grid well 2 is conveyed into the regulating tank 31, the water quantity of a sewage treatment system is regulated through the stored water in the regulating tank 31, and the continuous operation of the sedimentation tank 3 at the downstream of the regulating tank 31 is ensured;

the bottom of the sedimentation tank 3 is provided with two square funnel-shaped mud settling hoppers 314 for enhancing the sludge deposition effect of the sedimentation tank 3, in order to reduce the vertical height of the mud settling hoppers 314 and achieve the convenience of mud suction, a steel mud through pipe 315 is communicated between the bottoms of the two mud settling hoppers 314, a submersible pump is arranged in the bottom of one mud settling hopper 314, in order to balance the sand settling amount of the two mud settling hoppers 314, the middle part of the adjusting tank 31 is provided with a vertical guide cylinder 313, the guide cylinder 313 is suspended at the junction of the two mud settling hoppers 314, the inside of the guide cylinder 313 is hollow, and a vertical splitter 3131 is arranged at the opening at the lower end of the guide cylinder 313 along the diameter and is used for uniformly guiding the equal division of the silt in the guide cylinder 313 into two mud settling hoppers 314;

in order to prevent sludge deposition, water distribution pipes 101 are uniformly distributed at the bottoms of the deoxidation tank 32 and the anaerobic tank 4, aeration pipes 102 are uniformly distributed at the bottoms of the anoxic tank 5 and the aerobic membrane tank 6, the water distribution pipes 101 are laid in the deoxidation tank 32 to keep low dissolved oxygen in the two tanks and prevent oxygen in the sewage from increasing due to oxygen dissolution in the aeration process, the aeration pipes 102 in the anoxic tank 5 and the aerobic membrane tank 6 are used for stirring the sewage and regulating and controlling the oxygen content through aeration quantity, in order to prevent dead angles which cannot be stirred at the tank bottom and prevent the water distribution holes or the aeration holes 108 from being blocked, the water distribution holes formed in the water distribution holes and the aeration holes 108 formed in the aeration pipes 102 are respectively positioned at the lower sides of the water distribution pipes 101 and the aeration pipes 102 and are staggered and arranged along the vertical direction at an included angle of 45 degrees, and the stirring area is enlarged;

the opening at the upper end of the sedimentation tank 3 is provided with a triangular weir plate 311, the triangular weir plate 311 is arranged on the inner periphery of the sedimentation tank 3 in a square frame shape and is used for ensuring the uniform water outlet of the sedimentation tank 3 and preventing short flow, one end of the triangular weir plate 311 close to the anaerobic tank 4 is communicated with an overflow pipe 312, in order to prevent overflowing sewage from causing the fluctuation of the dissolved oxygen in the anaerobic tank 4 to be overlarge, the tail end of the overflow pipe 312 is led into the anoxic tank 5, the triangular weir plate 311 is the prior art, and the installation mode and the specific structure are not described again;

in order to improve the biological treatment capacity of the aerobic tank, an MBR membrane group 61 is arranged in the aerobic membrane tank 6, the MBR membrane group 61 adopts a flat ultrafiltration membrane group so that the MBR membrane group 61 can keep strong anti-cleaning strength, a dosing tank 62 is arranged above the corner of the aerobic membrane tank 6, drugs are added into the aerobic membrane tank through a dosing pipe 106, then phosphorous removal drugs are uniformly sprinkled into the aerobic membrane tank 6 through a plurality of dosing pipes 103, in order to reduce the pressure of the dosing pipes 103, the starting sections of the dosing pipes 103 are vertically disconnected, and the lower disconnected part is funnel-shaped in order to prevent the drugs from splashing out;

the working principle is as follows: domestic sewage firstly enters a septic tank 1 for pretreatment, supernatant of the septic tank 1 enters a biodegradation tank through a sewage pipe network, the sewage is firstly intercepted and separated from large-particle solid impurities (such as leaves, weeds, wood blocks, waste plastics and the like) in water through a grating well 2, and is subjected to sediment settlement treatment through a sand settlement area 21, so that normal work of a subsequent water pump and treatment equipment is protected;

the sewage enters an adjusting tank 9 after being subjected to slag settling and primary impurity removal by a grid well 2, the water quantity of the system is adjusted by the adjusting tank 9, macromolecular organic matters in the sewage are decomposed into micromolecular organic matters through an anaerobic reaction in the adjusting tank 9, the subsequent degradation reaction is facilitated, and the sewage in the adjusting tank 9 is sent into the integrated sewage treatment equipment through a lifting pump;

sewage firstly enters a sedimentation tank 3, suspended matters in the sewage are removed through sedimentation in the sedimentation tank 3, the primary purification of water quality is completed, supernatant in the sedimentation tank 3 is conveyed to an anaerobic tank 4, the dephosphorization step is completed, then the sewage enters an anoxic tank 5, meanwhile, reflux mixed liquor of an aerobic membrane tank 6 is also fed, the primary function of the anoxic tank 5 is denitrification, denitrifying bacteria use organic matters in the sewage as a carbon source to reduce a large amount of NO3 & lt- & gt and NO2 & lt- & gt carried in the reflux sludge in the aerobic membrane tank 6 into N2 and release the N2 into air, BOD concentration is continuously reduced, NO3 & lt- & gt concentration is also greatly reduced, the sewage in the tank is stirred by aeration to prevent bottom sludge from depositing, the sewage in the anoxic tank 5 flows back to the anaerobic tank 4, the hydraulic retention time of the sewage is increased under the same volume, and the denitrification efficiency is improved;

the produced water of the anoxic tank 5 flows into an aerobic tank, the aeration pipe 102 is laid at the bottom of the tank, the aeration pipe 102 is connected with an MBR membrane group 61, the sewage is subjected to biochemical degradation of organic matters therein and is oxidized into harmless substances, the BOD and COD in the water are reduced, meanwhile, the air-water oscillation cleaning of the MBR membrane is carried out, the surface of the membrane is kept clean, the biodegradation is carried out continuously in the section, NH3-N is effectively removed, macromolecular organic matters which are difficult to degrade can be intercepted, the retention time of the macromolecular organic matters in the reactor is prolonged, the degradation is carried out to the maximum extent, a sludge pump returns the mixed liquid containing NO 3-and NO 2-to the front-end anoxic mixed liquid tank 5 for denitrification, and meanwhile, the sludge pump has the sludge discharge function, the residual sludge is discharged periodically, and the concentration of active sludge in the system can be controlled;

water in the aerobic membrane pool 6 enters the MBR membrane group 61, membrane separation filtration and biodegradation are carried out, water produced by the MBR membrane group 61 is pumped into the clean water pool 8 by a pump, and the water is discharged after reaching the standard after being sterilized in the clean water pool 8; when the total phosphorus concentration of inlet water is higher and the biological phosphorus removal can not reach the standard, a medicine adding box 62 and a medicine adding pipe 103 are additionally arranged in the aerobic membrane pool 6, and the mixed liquid of the polyaluminium chloride and the ferric chloride is injected into the aerobic membrane pool 6 to realize chemical phosphorus removal;

most pollutants are intercepted by an aerobic membrane tank 6 of the integrated equipment, the sludge concentration in the aerobic membrane tank 6 is at a higher level, in order to balance the sludge concentration of the whole sewage treatment system, the sludge in the aerobic membrane tank 6 needs to flow back to a front-section anoxic tank 5, nitrate generated by nitrification reaction of the aerobic membrane tank 6 is subjected to denitrification in the anoxic tank 5, meanwhile, the sludge has a certain dilution effect on the water pollutants, residual sludge (including phosphorus-containing sludge generated by chemical phosphorus removal) in the membrane tank needs to be discharged to the sludge tank, the sludge tank is desilted regularly, and supernatant in the sludge tank flows back to a deoxidizing tank 32.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The utility model provides a biodegradable tank for sewage treatment, its characterized in that, includes grid well (2), equalizing basin (9) and the integration sewage treatment device that connects in order, integration sewage treatment device mainly comprises sedimentation tank (3), anaerobism pond (4), oxygen deficiency pond (5) and aerobic membrane pond (6) that connect in order, sedimentation tank (3) side is equipped with deoxidation tank (32), be equipped with a plurality of MBR membrane group (61) in aerobic membrane pond (6), be equipped with mixed liquid backflow pipeline between oxygen deficiency pond (5) and anaerobism pond (4), be equipped with mixed liquid backflow pipeline between aerobic membrane pond (6) and oxygen deficiency pond (5);

connect clean water basin (8) and storage mud pit (7) behind good oxygen membrane cisterna (6), clean water basin (8) are linked together with production water pipe (104) of MBR membrane group (61), store up mud pit (7) and be linked together with sludge pipe (64) of good oxygen membrane cisterna (6) bottom, it is equipped with supernatant return line to store up between the supernatant part of mud pit (7) and deoxidation pond (32).

2. The biodegradation tank for sewage treatment according to claim 1, wherein: a coarse grating (22) and a fine grating (23) are sequentially arranged in the grating well (2).

3. The biodegradation tank for sewage treatment according to claim 1, wherein: and a sand setting area (21) is arranged at the bottom of the grating well (2).

4. The biodegradation tank for sewage treatment according to claim 1, wherein: the bottom of sedimentation tank (3) is equipped with two square hopper-shaped mud buckets (314), two it has logical mud pipe (315) to sink the intercommunication between the bottom of mud bucket (314).

5. The biodegradation tank for sewage treatment according to claim 4, wherein: the sedimentation tank is characterized in that a vertical guide cylinder (313) is arranged in the middle of the sedimentation tank (3), the guide cylinder (313) is suspended at the junction of the two mud settling hoppers (314), the guide cylinder (313) is hollow inside, and a vertical flow distribution plate (3131) is arranged at the opening at the lower end of the guide cylinder along the diameter.

6. The biodegradation tank for sewage treatment according to claim 1, wherein: the bottom of the deoxidation tank (32) and the bottom of the anaerobic tank (4) are uniformly provided with water distribution pipes (101), and the bottom of the anoxic tank (5) and the bottom of the aerobic membrane tank (6) are uniformly provided with aeration pipes (102).

7. The biodegradation tank for sewage treatment according to claim 6, wherein: a plurality of water distribution holes are formed in the lower side of the water distribution pipe (101), and the water distribution holes are staggered along an included angle of 45 degrees with the vertical direction;

aeration holes (108) are formed in the lower side of the aeration pipe (102), and the aeration holes (108) are arranged in a staggered mode along the direction which forms an included angle of 45 degrees with the vertical direction.

8. The biodegradation tank for sewage treatment according to claim 1, wherein: the upper end opening part of sedimentation tank (3) is equipped with triangle weir plate (311), triangle weir plate (311) are the square frame shape and enclose and locate sedimentation tank (3) interior week, the one end intercommunication that triangle weir plate (311) are close to anaerobism pond (4) has overflow pipe (312), the end of overflow pipe (312) lets in oxygen deficiency pond (5).

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