CN207645904U - Sludge zero discharge MBR sewage-treatment plants - Google Patents

Abstract

The utility model discloses a sludge zero-discharge MBR sewage treatment device, which comprises a sludge digestion tank, an anoxic tank, an MBR membrane tank and an equipment room connected in sequence; A plurality of excess sludge supernatant discharge pipes are installed in the lower parallel connection, and a sewage inlet pipe is provided at the bottom of the outer wall of the anoxic pool away from the MBR pool; agitators are installed in the sludge digestion tank and the anoxic pool; the anoxic pool and the anoxic pool The MBR membrane tanks are connected through anoxic overflow pipes; MBR membrane devices are installed in the MBR membrane tanks, and an air lift and reflux device is installed above the MBR membrane devices. , the bottom of the outer wall of the MBR membrane device near the equipment room is provided with an excess sludge discharge pipe, and the other end of the sludge discharge pipe is arranged at the bottom of the outer wall of the sludge digestion tank. The device has the advantages of good sewage treatment effect, energy saving and consumption reduction, and zero discharge of sludge.

Description

Sludge Zero Discharge MBR Sewage Treatment Plant

technical field

The utility model relates to the technical field of sewage treatment equipment, in particular to an MBR sewage treatment device with zero sludge discharge.

Background technique

Membrane Bioreactor (Membrane Bio-reactor, MBR) technology is an advanced water treatment technology with high effluent quality and mature technology. With the increasing localization rate and market application of key products - membrane products With popularization, the investment cost and operating cost of MBR membranes have gradually decreased. MBR membrane bioreactor is a process combining membrane and activated sludge. Microorganisms further degrade the pollutants retained by the membrane. MBR regularly discharges sludge to maintain the balance of sludge concentration inside the system. At present, MBR technology is widely used in the field of urban sewage treatment, and its effluent can reach the first-class A standard in the "Pollutant Discharge Standards for Urban Wastewater Treatment Plants" GB18918-2002, and meet the reuse water standard or surface water Class IV standard. It is widely used Applied to projects with high drainage standards or upgrading projects.

However, the existing integrated MBR sewage treatment system also has the following defects:

1. The effect of nitrogen and phosphorus removal is not good. Most of the existing integrated MBR sewage treatment equipment uses the AO+MBR process (anoxic, aerobic + MBR process) or AAO+MBR process (anaerobic, anoxic, aerobic + MBR process), and the AO+MBR process cannot be simultaneously Realize the effect of nitrogen and phosphorus removal; AAO+MBR process is compact because of the compact process. On the one hand, the mixed liquid flowing back to the anoxic zone often causes the dissolved oxygen concentration in the anoxic zone to be too high, which affects the denitrification effect. On the other hand, it flows back to the anoxic zone. The mixed solution contains nitrate, which affects the phosphorus removal effect;

2. High power consumption during operation. Due to the unreasonable selection of equipment and the large number of equipment, etc., the running power consumption remains high;

3. The equipment is not compact enough and occupies a large area.

4. The remaining sludge cannot be disposed of in time. The integrated MBR sewage treatment system achieves the purpose of removing phosphorus in sewage by discharging excess sludge. However, in general, the integrated MBR sewage treatment system has a small scale of treatment and is unattended, and the generated sludge cannot be treated in time, resulting in poor system operation.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a sludge zero discharge MBR sewage treatment device. The device has the advantages of good sewage treatment effect, energy saving and consumption reduction, and zero discharge of sludge.

In order to achieve the above-mentioned purpose, the utility model designs a kind of sludge zero-discharge MBR sewage treatment device, and it comprises the sludge digestion pond, anoxic pond, MBR film pond and equipment room that are connected successively; A plurality of residual sludge supernatant discharge pipes are installed in parallel on one side of the oxygen tank from top to bottom, and a digester aeration head assembly is arranged on the bottom surface of the sludge digestion tank, and the digestion tank aeration head assembly passes through The pipeline is connected with the blower in the equipment room, and the bottom of the outer wall of the anoxic pool is far away from the MBR membrane pool. The MBR membrane pools are connected through the anoxic overflow pipe; the bottom surface of the MBR membrane pool is provided with multiple sets of aeration head assemblies, and the aeration head assemblies are connected to the blower in the equipment room through pipelines.

An MBR membrane device is arranged in the MBR membrane pool, an air lift reflux device is arranged above the MBR membrane device, and a reflux pipe is arranged on the top of the air lift reflux device, and the reflux pipe extends into the bottom of the anoxic pool, close to the equipment room One side is provided with a water production pipe on the side wall of the MBR membrane device; a sludge discharge pipe is provided on the bottom of the outer wall of the MBR membrane device near the equipment room, and the other end of the sludge discharge pipe is provided at the bottom of the outer wall of the sludge digestion tank .

Further, the MBR membrane device includes an MBR membrane module, and a deflector is arranged around the MBR membrane module. The top of the flow plate is provided with an inclined flow guide plate inclined downward.

Still further, the inclination angle of the inclined deflector is 1-15°.

Still further, the aeration head assembly of the digestion tank and the pipeline connecting the aeration head assembly and the blower are correspondingly provided with electromagnetic valves for controlling the aeration head assembly and the aeration head assembly of the digestion tank.

Still further, the return pipe is also provided with a flow regulating valve.

Still further, a cleaning assembly is provided in the equipment room, and the cleaning assembly includes a clean water tank, a medicine adding box and a control solenoid valve arranged in parallel, and the clean water tank and the medicine adding box are both connected to the water production pipe.

Still further, a sludge pump is provided on the sludge discharge pipe.

Still further, the excess sludge supernatant discharge pipes are provided with clear liquid ball valves, and the other ends of the excess sludge supernatant liquid discharge pipes are connected to water supply pipes.

The beneficial effects of the utility model:

1) The sewage and the reflux mixture of the utility model enter the anoxic zone together and are fully mixed; the nitrate in the sludge undergoes denitrification reaction under the action of denitrifying bacteria, and the nitrate is converted into nitrogen to realize denitrification.

2) In the utility model, the remaining sludge supernatant is rich in phosphorus, which is collected for greening and realizes the recycling of phosphorus resources.

3) In the utility model, the remaining sludge enters the sludge digester, where anaerobic and aerobic digestion are performed, and zero discharge of sludge is realized.

4) The utility model utilizes the water head generated by membrane aeration to carry out internal backflow, which saves energy by eliminating the backflow pump.

Description of drawings

Fig. 1 is the top view of the utility model sludge zero discharge MBR sewage treatment device;

Fig. 2 is the front view of the utility model sludge zero discharge MBR sewage treatment device;

In the figure, sludge digestion tank 1, sludge supernatant discharge pipe 1.1, aeration head assembly 1.2, anoxic tank 2, anoxic overflow pipe 2.1, MBR membrane pool 3, aeration head assembly 3.1, equipment room 4 , blower 4.1, sewage inlet pipe 5, agitator 6, MBR membrane device 7, water production pipe 7.1, MBR membrane module 7.2, deflector 7.3, inclined deflector 7.4, air lift return device 8, return pipe 8.1, return adjustment Valve 8.2, sludge return pipe 9, sludge return pump 9.1, solenoid valve 10, cleaning assembly 11, clean water tank 11.1, dosing box 11.2, cleaning control solenoid valve 11.3, clear liquid ball valve 12.

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can understand.

The sludge zero-discharge MBR sewage treatment device shown in Figures 1-2 includes sludge digestion tank 1, anoxic tank 2, MBR membrane tank 3 and equipment room 4 connected in sequence; sludge digestion tank 1 is far away from anoxic On the outer wall of one side of the pool 2, there are seven excess sludge supernatant discharge pipes 1.1 installed in parallel from top to bottom, and each excess sludge supernatant liquid discharge pipe 1.1 is equipped with a clear liquid ball valve 12;

The bottom surface of the sludge digester 1 is provided with a digester aeration head assembly 1.2, which is connected to the blower 4.1 in the equipment room 4 through pipelines, and the pipeline connecting the digester aeration head assembly 1.2 and the blower 4.1 All are correspondingly provided with a solenoid valve 10 for controlling the aeration head assembly 1.2 of the digestion tank.

The bottom of the outer wall of the anoxic pool 2 away from the MBR membrane pool 3 is provided with a sewage inlet pipe 5; the sludge digester 1 and the anoxic pool 2 are equipped with agitators 6; the anoxic pool 2 and the MBR membrane pool 3 pass through The anoxic overflow pipe 2.1 is connected; two sets of aeration head assemblies 3.1 are arranged on the bottom surface of the MBR membrane pool 3, and the two sets of aeration head assemblies 3.1 are connected to the blower 4.1 in the equipment room 4 through pipelines, and each set of aeration head assemblies 3.1 The electromagnetic valve 10 of the aeration head assembly 3.1 is correspondingly arranged on the pipeline connected with the blower 4.1.

MBR membrane tank 3 is provided with MBR membrane device 7, MBR membrane device 7 includes MBR membrane module 7.2, MBR membrane module 7.2 is surrounded by deflector 7.3, and water production pipe 7.1 passes through deflector 7.3 to communicate with MBR membrane module 7.2, The top of the deflector 7.3 near the side of the anoxic pool 2 is provided with an inclined deflector 7.4 with a downward slope angle of 1-15°.

An air lift reflux device 8 is arranged above the MBR membrane device 7, a reflux pipe 8.1 is arranged on the top of the air lift reflux device 8, and a flow regulating valve 8.2 is also arranged on the reflux pipe 8.1;

The return pipe 8.1 extends into the bottom of the anoxic pool 2, and the side wall of the MBR membrane device 7 near the equipment room 4 is provided with a water production pipe 7.1; the bottom of the outer wall of the MBR membrane device 7 near the equipment room 4 is provided with sludge The discharge pipe 9 and the other end of the sludge discharge pipe 9 are arranged at the bottom of the outer wall of one side of the sludge digestion tank 1 . Sludge discharge pipe 9 is provided with sludge pump 9.1

A cleaning assembly 11 is also provided in the equipment room 4, and the cleaning assembly 11 includes a clean water tank 11.1, a dosing box 11.2 and a control solenoid valve 11.3 arranged in parallel, and the clean water tank 11.1 and the dosing box 11.2 are connected to the water production pipe 7.1.

The working process of the above sludge zero discharge MBR sewage treatment plant:

1) Sewage enters the anoxic pool 1 through the sewage inlet pipe 5, and mixes with the digestive liquid from the MBR membrane pool 3, and the denitrifying bacteria use the carbon source in the sewage to perform denitrification in the anoxic pool 1 to achieve denitrification; In the anoxic pool 2, the microbes convert the high-quality carbon source in the sewage into energy storage substances such as poly-β-hydroxybutyric acid, and release the phosphorus stored in the body; then the mixed solution enters the MBR membrane pool 3 through the anoxic overflow pipe 2.1, and in the Under the condition of aeration, the phosphorus accumulating bacteria absorb the phosphorus in the sewage and store it in the body, the nitrifying bacteria convert the organic nitrogen in the sewage into nitrate and nitrite nitrogen, and the remaining organic matter is further degraded by microorganisms; the remaining sludge is passed through The sludge pipe 9 is discharged into the sludge digester 1, and after standing for clarification, the phosphorus-rich supernatant is discharged through the sludge supernatant discharge pipe 1.1, and the residual liquid in the sludge digester 1 is realized by controlling the solenoid valve 10. The sludge realizes aerobic and anaerobic digestion, and digests the remaining sludge.

2) The purified sewage flows out with the water production pipe 7.1, and the reflux mixed liquid flows back to the anoxic pool 2 through the air lift reflux device 8 and the reflux pipe 8.1;

3) After the work is completed, the liquid in the clean water tank 11.1 and the dosing tank 11.2 passes through the water production pipe 7.1 to return to clean the MBR membrane device 7.

Other parts not specified in detail are prior art. Although the foregoing embodiments have described the utility model in detail, it is only a part of the embodiments of the utility model, rather than all embodiments, and people can also obtain other embodiments according to the present embodiment without inventive step, these The embodiments all belong to the protection scope of the present utility model.

Claims (8)

1. A kind of sludge zero-discharge MBR sewage treatment plant, it comprises sludge digester (1), anoxic pond (2), MBR film pond (3) and equipment room (4) connected successively; It is characterized in that: On the outer wall of the sludge digester (1) away from the anoxic tank (2), a plurality of remaining sludge supernatant discharge pipes (1.1) are installed in parallel from top to bottom, and the sludge digester (1) The digester aeration head assembly (1.2) is arranged on the bottom surface, and the digester aeration head assembly (1.2) is connected to the air blower (4.1) in the equipment room (4) through pipelines, and the anoxic pool (2) is far away from The bottom of the outer wall of one side of the MBR membrane tank (3) is provided with a sewage inlet pipe (5); the sludge digestion tank (1) and the anoxic tank (2) are all provided with an agitator (6); the anoxic tank (2) communicate with the MBR membrane tank (3) by anoxic overflow pipe (2.1); the bottom surface of the MBR membrane tank (3) is provided with multiple groups of aeration head assemblies (3.1), and the aeration head The components (3.1) are all connected to the blower (4.1) in the equipment room (4) through pipelines, An MBR membrane device (7) is arranged in the MBR membrane pool (3), an air lift reflux device (8) is arranged above the MBR membrane device (7), and a reflux device (8) is arranged on the top of the air lift reflux device (8). pipe (8.1), the return pipe (8.1) extends into the bottom of the anoxic tank (2), and a water production pipe (7.1) is arranged on the side wall of the MBR membrane device (7) near the equipment room (4); A sludge discharge pipe (9) is arranged on the bottom of the outer wall of the MBR membrane device (7) on one side of the equipment room (4), and the other end of the sludge discharge pipe (9) is arranged on the bottom of the outer wall on one side of the sludge digestion tank (1). 2. The sludge zero-discharge MBR sewage treatment device according to claim 1, characterized in that: the MBR membrane device (7) includes an MBR membrane module (7.2), and guides are arranged around the MBR membrane module (7.2). Flow plate (7.3), the water production pipe (7.1) passes through the flow deflector (7.3) and communicates with the MBR membrane module (7.2), and is set near the top of the flow deflector (7.3) on the side of the anoxic tank (2) There are inclined deflectors (7.4) that slope downwards. 3. The MBR sewage treatment device with zero sludge discharge according to claim 2, characterized in that: the inclined deflector (7.4) has an inclination angle of 1-15°. 4. The sludge zero-discharge MBR sewage treatment device according to claim 1, characterized in that: said digester aeration head assembly (1.2) and aeration head assembly (3.1) are connected with the blower (4.1) on the pipeline Both are correspondingly provided with electromagnetic valves (10) for controlling the aeration head assembly (1.2) and the aeration head assembly (3.1) of the digestion tank. 5. The sludge zero-discharge MBR sewage treatment device according to claim 1, characterized in that: the return pipe (8.1) is also provided with a flow regulating valve (8.2). 6. The sludge zero-discharge MBR sewage treatment device according to claim 1, characterized in that: a cleaning assembly (11) is also provided in the equipment room (4), and the cleaning assembly (11) includes a parallel set The clear water tank (11.1), the dosing box (11.2) and the control solenoid valve (11.3), the clear water tank (11.1) and the dosing box (11.2) are all connected with the water production pipe (7.1). 7. The MBR sewage treatment device with zero sludge discharge according to claim 1, characterized in that: the sludge discharge pipe (9) is provided with a sludge pump (9.1). 8. The sludge zero-discharge MBR sewage treatment device according to claim 1, characterized in that: the excess sludge supernatant discharge pipe (1.1) is provided with clear liquid ball valves (12), and the excess sludge The other end of the mud supernatant discharge pipe (1.1) is connected with a water supply pipe (13).