CN216764448U

CN216764448U - Peripheral-inlet middle-outlet aerobic reaction tank for BFM-MBBR sewage treatment process

Info

Publication number: CN216764448U
Application number: CN202220234798.6U
Authority: CN
Inventors: 周家中; 吴迪; 韩文杰; 杨忠启; 周浩然; 程丽洁
Original assignee: Qingdao Spring Water Treatment Co ltd
Current assignee: Qingdao Spring Water Treatment Co ltd
Priority date: 2022-01-28
Filing date: 2022-01-28
Publication date: 2022-06-17
Anticipated expiration: 2032-01-28

Abstract

The utility model discloses a peripheral-in and central-out aerobic reaction tank for a BFM-MBBR sewage treatment process, and relates to the technical field of sewage treatment equipment. The reaction tank comprises a reaction tank body, wherein the reaction tank body is cylindrical, a water inlet channel is arranged on the periphery of the top of the reaction tank body, the water inlet channel is connected with a water inlet pipe, water is introduced into the water inlet channel through the water inlet pipe, and the water inlet channel feeds water into the reaction tank body in a multi-point water inlet mode; an interception screen is arranged in the reaction tank body, the interception screen is cylindrical in overall shape, and the height of the interception screen is the same as that of the reaction tank body; a suspension carrier is filled between the outer wall of the interception screen and the inner wall of the reaction tank body; the bottom of the reaction tank body is provided with an aeration pipe which is positioned outside the interception screen. The reaction tank of the utility model does not need a plug flow stirrer, can realize the uniform fluidization of the suspended carrier, and reduces the operation cost while ensuring the high standard of the effluent quality.

Description

Peripheral-inlet middle-outlet aerobic reaction tank for BFM-MBBR sewage treatment process

Technical Field

The utility model relates to the technical field of sewage treatment equipment, in particular to a peripheral-in and central-out aerobic reaction tank for a BFM-MBBR sewage treatment process.

Background

In recent years, with the continuous increase of sewage treatment capacity and the continuous strictness of discharge standards in China, the requirements of new construction of sewage plants in land saving and standard improvement, capacity expansion and transformation of original pools are continuously increased. The Moving Bed Biofilm Reactor (MBBR) has the advantages of in-situ inlaying and high-efficiency intensive performance, and effectively solves the problem of land shortage in new construction and modification of sewage plants. The core difficulty of the application of the MBBR technology is to maintain good fluidization of the suspended carrier, and in order to achieve the purpose, the MBBR technology is mainly solved from the aspects of MBBR pool type arrangement, equipment arrangement and the like.

The current research reports related to the prior art mainly include:

CN213950724U discloses an aerobic moving bed biofilm reactor, which realizes the circulation flow of suspended carriers by the arrangement of aeration direction and diversion and flow pushing plate. But the aeration air outlet direction at the bottom of the water outlet end is not vertical, and the traditional stirrer is replaced by an aeration mode, so that the oxygenation efficiency of the area is low, the anoxic condition is suitable to occur, and the risk that the outlet water does not reach the standard is caused.

CN209468174U discloses an MBBR micro-power mixing tank for aerobic treatment, which promotes a suspended carrier to form a circular flow by arranging an aeration system on one side and adding a guide plate, so that an aerobic area is indirectly shortened, an anoxic environment exists in a reaction tank, and the stability of effluent quality is influenced.

In the above prior art, fluidization of the suspended carrier is promoted by external force such as aeration. However, in actual operation, part of aeration quantity is only for realizing fluidization of the suspended carrier, but not oxygenation, so that the actual aeration quantity is higher than the normal design value, and further, the energy consumption is increased. In fact, the fluidization of the suspended carrier in water is influenced by the flow velocity of the water flow and the external power (such as aeration and the like). The traditional mode is that water inflow generally adopts single-point water inflow, the flow velocity of water flow is large, the aeration air velocity is easily weakened, and the fluidization of a suspended carrier is influenced. At this time, in order to satisfy fluidization of the suspended carrier, external power needs to be increased, such as local aeration or a mode of adding a plug flow stirrer, so that energy consumption is high and stability of effluent quality is affected.

It can be seen that the prior art is subject to further improvement.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a peripheral-inlet middle-outlet aerobic reaction tank for a BFM-MBBR sewage treatment process, which does not need a plug flow stirrer, can realize uniform fluidization of a suspended carrier, ensures high effluent quality standard and reduces operation cost.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a peripheral inlet and outlet aerobic reaction tank for a BFM-MBBR sewage treatment process comprises a reaction tank body, wherein the reaction tank body is cylindrical, an inlet channel is arranged on the periphery of the top of the reaction tank body, the inlet channel is connected with an inlet pipe, water is introduced into the inlet channel through the inlet pipe, and the inlet channel feeds water into the reaction tank body in a multi-point water inlet mode;

the reaction tank body is internally provided with an interception screen, the interception screen is cylindrical in overall shape, and the height of the interception screen is the same as that of the reaction tank body;

a suspension carrier is filled between the outer wall of the interception screen and the inner wall of the reaction tank body;

an aerator pipe is arranged at the bottom of the reaction tank body and is positioned outside the intercepting screen;

the center of the bottom of the reaction tank body is provided with a water outlet which is also positioned at the bottom of the interception screen.

As a preferred scheme of the utility model, the cylindrical interception screen and the cylindrical reaction tank body are designed coaxially.

In another preferred embodiment of the present invention, the specific gravity of the suspension vehicle is 0.94 to 0.97g/cm³The void ratio is not less than 90 percent, and the filling ratio is not more than 67 percent.

Preferably, a plurality of through holes are uniformly distributed in the circumferential direction of the intercepting screen, the through holes are circular or square, the diameter of the circular through holes is smaller than that of the suspension carrier, and the side length of the square through holes is smaller than that of the suspension carrier.

Preferably, the water inlet channel feeds water into the reaction tank body in a drop-out manner.

Preferably, the drop-down type water inlet is realized by an inlet channel which is higher than the effective liquid level in the reaction tank body through a triangular weir.

Preferably, the ratio of the height to the diameter of the reaction tank body is 0.3-1.0: 1, and the ratio of the interception screen mesh to the reaction tank body is 0.05-0.20: 1.

Preferably, the ratio of the diameter of the circular through hole to the diameter of the suspension carrier is 0.70-0.85: 1, the ratio of the side length of the square through hole to the diameter of the suspension carrier is 0.50-0.70: 1.

compared with the prior art, the utility model has the following beneficial technical effects:

(1) the utility model provides a peripheral in-and-out aerobic reaction tank for a BFM-MBBR sewage treatment process, which realizes peripheral multi-point water inlet by arranging a reaction tank body into a cylinder and arranging a water inlet channel on the periphery of the reaction tank body, reduces the water inlet flow rate by increasing the water inlet section, weakens the influence of the water inlet flow rate on the air velocity, and further realizes uniform fluidization of a suspended carrier under normal aeration quantity.

(2) The reaction tank has a large water inlet section, and further has strong water impact resistance.

(3) The reaction tank of the utility model does not need to be provided with a stirrer, thereby saving the investment and the operation cost.

In conclusion, the aerobic reaction tank with the functions of circumferential inlet, middle outlet and sewage treatment for the BFM-MBBR sewage treatment process can realize uniform fluidization of a suspension carrier under low consumption and obtain stable effluent quality.

Drawings

The utility model is further described below with reference to the accompanying drawings:

FIG. 1 is a top view of a week-in, middle-out aerobic reaction tank for a BFM-MBBR sewage treatment process of the present invention;

FIG. 2 is a sectional view of a circumferential inlet, a central outlet and an aerobic reaction tank for a BFM-MBBR sewage treatment process of the present invention;

in the figure:

1. the device comprises a water inlet pipe, 2 a water inlet channel, 3 a reaction tank body, 4 an interception screen, 5 a water outlet pipe, 6 a suspension carrier, 7 and an aeration pipe.

Detailed Description

The utility model provides a peripheral in-and-out aerobic reaction tank for a BFM-MBBR sewage treatment process, and the utility model is described in detail with reference to specific embodiments in order to make the advantages and technical scheme of the utility model clearer and more clear.

Referring to fig. 1 and 2, the aerobic reaction tank for the BFM-MBBR sewage treatment process of the present invention comprises a reaction tank body 3, and unlike the prior art, the reaction tank body 3 is designed as a cylinder, and the cylinder is hollow, i.e., the reaction is performed inside the cylinder. Specifically, with reaction tank body complex inlet channel 2, it is located the periphery at reaction tank body top, is equivalent to, and around a week at the outer wall at reaction tank body top, promptly for the inlet channel, and the inlet channel is intake to wherein through the inlet tube 1 of being connected with it, guarantees that the effective liquid level of inlet channel 2 is higher than the effective liquid level of reaction tank body 3, then adopts triangle weir to this internal water inflow of reaction tank.

Because the inlet channel is matched with the cylindrical reaction tank body, the shape of the reaction tank body is also circular, so that peripheral water inlet can be realized, namely, the mode of single-point water inlet in the prior art is changed, the utility model is designed to be multi-point water inlet, and the purpose of the design is as follows: the cross section of the water flow is large, the flow velocity of the cross section is low, the water impact resistance is excellent, and the influence of the flow velocity of the water flow on the aeration gas velocity is small.

The intercepting screen 4 is matched with the reaction tank body, the shape of the intercepting screen is designed to be a cylinder, the cylindrical reactor body and the intercepting screen are designed to be concentric with each other and have the same height, a plurality of through holes are uniformly distributed in the circumferential direction of the intercepting screen, the through holes can be circular or square, and when the through holes are circular, the diameter of each through hole is smaller than that of the suspended carrier; when the through holes are square, the side length of each through hole is smaller than the diameter of the suspension carrier, and the intercepting screen is preferably made of stainless steel.

A suspension carrier 6 is filled between the outer wall of the interception screen and the inner wall of the reaction tank body, and preferably, the specific gravity of the suspension carrier 6 is 0.94-0.97 g/cm³The void ratio is not less than 90 percent, and the filling ratio is not more than 67 percent.

The bottom of the reaction tank body is provided with an aeration pipe 7 which is positioned outside the interception screen 4, and the structure of the aeration pipe is the same as that of the prior art, and the detailed description is omitted.

The center of the bottom of the reaction tank body is provided with a water outlet, and the position of the water outlet is just positioned at the bottom in the intercepting screen, so that the design aims to prevent the suspended carriers from being flushed out, increase the hydraulic retention time and prevent short flow.

Further preferably, the ratio of the diameter of the circular through hole to the diameter of the suspension carrier is 0.70-0.85: 1; the ratio of the side length of the square through hole to the diameter of the suspension carrier is 0.50-0.70: 1.

preferably, the above-mentioned inlet channel is to the internal through drop-out type intaking of reaction tank, if realize drop-out type intaking through the inlet channel that is higher than this internal effective liquid level of reaction tank through the triangle weir, adopt drop-out type intaking's aim at: the water is more uniformly fed in a drop-down water feeding mode.

Preferably, the ratio of the height to the diameter of the reaction tank body is 0.3-1.0: 1, the ratio of the height to the diameter is not too large, the bottom area occupied by the intercepting screen is mainly considered, and the small diameter of the reaction tank means that the gas distribution area is small, so that the installation of aeration equipment is not facilitated, and the oxygenation by an aerobic system is not utilized.

The diameter ratio of the interception screen mesh to the reaction tank body is 0.05-0.20: 1.

The operation method of the aerobic reaction tank for the sewage treatment process of BFM-MBBR in the circumferential inlet and the middle outlet is explained in detail below.

The method specifically comprises the following steps:

firstly, introducing water to be treated into a water inlet channel through a water inlet pipe;

secondly, after the water inlet channel is full of water, the water enters the reaction tank body in a drop mode and a multipoint water inlet mode through a triangular weir;

thirdly, in the reaction tank body, the fluidization of the suspended carrier is realized through the aeration effect, and the removal of pollutants is completed at the same time;

fourthly, blocking the suspended carrier between the interception screen and the wall of the reaction tank body through the interception screen, and enabling the treated sewage to pass through the interception screen;

fifthly, in the intercepting sieve net, sewage flows out of the reactor body through a water outlet.

In conclusion, compared with the square tank body (the water flow velocity is large, and the aeration air velocity is weakened, so that the fluidization of a suspension carrier is influenced, and the aeration amount is improved) in the prior art, the aerobic reaction tank for BFM-MBBR sewage treatment process has the advantages that the reaction tank body is designed to be circular, and the fluidization of the suspension carrier can be realized by combining with multi-point water inlet, so that the meaningless aeration amount is reduced.

Parts which are not described in the utility model can be realized by adopting or referring to the prior art.

Although terms such as inlet pipe 1, inlet channel 2, reaction cell body 3, interception screen 4 are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

It is further understood that the specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Claims

1. A week advances well aerobic reaction pond that goes out for BFM-MBBR sewage treatment process, it includes the reaction tank body, its characterized in that: the reaction tank body is cylindrical, a water inlet channel is arranged on the periphery of the top of the reaction tank body and connected with a water inlet pipe, water is introduced into the water inlet channel through the water inlet pipe, and the water inlet channel feeds water into the reaction tank body in a multi-point water feeding mode;

the reaction tank comprises a reaction tank body, and is characterized in that an interception screen is arranged in the reaction tank body, the interception screen is cylindrical in overall shape, and the height of the interception screen is the same as that of the reaction tank body;

an aerator pipe is arranged at the bottom of the reaction tank body and is positioned outside the interception screen;

2. The aerobic reaction tank with the inlet and the outlet for BFM-MBBR sewage treatment process of claim 1, wherein: the intercepting screen which is a cylinder and the reaction tank body which is a cylinder are designed coaxially.

3. The aerobic reaction tank with the inlet and the outlet for BFM-MBBR sewage treatment process of claim 1, wherein: the specific gravity of the suspension carrier is 0.94-0.97 g/cm³The void ratio is not less than 90 percent, and the filling ratio is not more than 67 percent.

4. The aerobic reaction tank with the cycle inlet and the cycle outlet for the BFM-MBBR sewage treatment process according to claim 1, wherein: a plurality of through holes are uniformly distributed in the circumferential direction of the intercepting screen, the through holes are circular or square, the diameter of the circular through holes is smaller than that of the suspension carrier, and the side length of the square through holes is smaller than that of the suspension carrier.

5. The aerobic reaction tank with the inlet and the outlet for BFM-MBBR sewage treatment process of claim 1, wherein: the water inlet channel feeds water into the reaction tank body in a drop-out manner.

6. The aerobic reaction tank with the inlet and the outlet for BFM-MBBR sewage treatment process of claim 5, wherein: the drop-out type water inlet is realized by an inlet channel which is higher than the effective liquid level in the reaction tank body through a triangular weir.

7. The aerobic reaction tank with the inlet and the outlet for BFM-MBBR sewage treatment process of claim 1, wherein: the ratio of the height to the diameter of the reaction tank body is 0.3-1.0: 1, and the ratio of the interception screen to the reaction tank body is 0.05-0.20: 1.

8. The aerobic reaction tank with week inlet and middle outlet for BFM-MBBR sewage treatment process according to claim 4, wherein: the diameter ratio of the circular through hole to the suspension carrier is 0.70-0.85: 1, the ratio of the side length of the square through hole to the diameter of the suspension carrier is 0.50-0.70: 1.