CN203360118U - Improved bio-augmentation membrane bioreactor - Google Patents

Abstract

The utility model relates to the technical field of water treatment, in particular to an improved bio-enhanced membrane bioreactor, which is characterized in that a membrane module is arranged in the center of the shell, and a number of fluidized light filler particles are filled around the membrane module, and the fluidized light weight An aerobic bacteria layer is formed outside the filler particles, and an anaerobic or facultative bacteria layer is formed inside the fluidized lightweight filler particles. The top side of the casing is connected to the raw water pump outlet outside the casing through the first diversion tube. The top of the aeration tube is connected to the inlet of the produced water pump through the second diversion tube, and a horizontal aeration tube is provided under the fluidized light filler particles, and the inlet end of one side of the aeration tube is connected to the reaction pump through the third diversion tube. There is a fan outside the housing of the device, and a mud discharge hole is also provided on the side wall of the housing corresponding to the other side of the aeration pipe. The utility model has high volume load and small occupied area. Oxygen has high mass transfer efficiency, low energy consumption, low membrane fouling rate, good denitrification effect, high degree of automation, and online cleaning and maintenance.

Description

An Improved Bio-augmented Membrane Bioreactor

[technical field]

The utility model relates to the technical field of water treatment, in particular to a biological reaction device using an improved bio-enhanced membrane bioreactor to process and recycle sewage.

[Background technique]

Membrane bioreactor (MBR) technology combines the biodegradation function of the traditional activated sludge method and the efficient separation function of the membrane. It has many advantages such as good effluent quality, stable process operation, high volume load, and small footprint. and reuse fields have been widely used. However, in long-term practice, membrane fouling has become the biggest obstacle in the application of MBR:

1. Increase infrastructure investment. Membrane fouling leads to serious flux attenuation, requiring a larger membrane area, resulting in increased infrastructure investment.

2. High energy consumption. Membrane interception maintains a high sludge concentration in the reactor and can provide volume load, but it also leads to a decrease in mass transfer efficiency and increased membrane fouling. In order to meet microbial growth and slow down membrane fouling, higher aeration intensity and energy consumption are required. Increase.

3. Membrane module maintenance and cleaning trouble. Membrane fouling leads to rapid attenuation of the membrane flux, requiring frequent cleaning and maintenance, cumbersome operation, long system shutdown time, affecting the normal production of the enterprise, and increasing operating costs.

Moreover, the deep denitrification effect of the traditional membrane bioreactor is not ideal, and after being discharged into the environmental water body, it is easy to cause eutrophication of the water body.

[Content of the invention]

The utility model is just to overcome the deficiencies and defects of the prior art, combining fluidized bed technology, immobilized microorganism technology, membrane interception technology and online cleaning technology, to improve the flow state in the reactor and increase the concentration of effective microorganisms in the reactor , enrich the number of nitrifying bacteria with a long generation cycle, enrich the microbial phase of the system, reduce the concentration of membrane fouling substances in the system, and delay the process of membrane fouling. To provide a bio-enhanced membrane water treatment device with good pollutant removal effect, low energy consumption and light membrane pollution.

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the utility model is realized through the following technical solutions:

Design an improved bio-augmented membrane bioreactor, including a shell, a water pump, a fan, and a draft tube, characterized in that a membrane module is arranged in the center of the inside of the housing, and a number of fluidized lightweight fillers are filled around the membrane module Particles make the microorganisms in the system attach to the fluidized filler as much as possible, reduce the concentration of suspended sludge in the system, reduce the contact probability between sludge particles and the membrane surface, and at the same time, the fluidized lightweight filler and the membrane surface repeatedly collide Contact with the membrane surface is beneficial to reduce the fouling degree of the membrane surface and significantly reduce the membrane fouling rate; an aerobic bacteria layer is formed outside the fluidized lightweight filler particles, and an anaerobic or facultative bacteria layer is formed inside the fluidized lightweight filler particles, There are different types of organisms inside and outside, so that each carrier is a micro-reactor, so that nitrification and denitrification can exist at the same time, so as to realize synchronous nitrification and denitrification in the aerobic zone; the top side of the shell passes through the first The diversion pipe is connected to the outlet of the raw water pump outside the housing, the top of the membrane module is connected to the inlet of the product water pump through the second diversion pipe, and a horizontal aeration pipe is arranged below the several fluidized light filler particles. The inlet end of one side of the aeration pipe is connected to the fan outside the reactor shell through the third guide pipe, which can improve the flow state in the reactor, and make the air bubbles Smaller, which increases the utilization rate of oxygen and reduces energy consumption. A mud discharge hole is also provided on the corresponding shell side wall on the other side of the aeration pipe.

One end of the tap of the second diversion pipe is connected to the backwash pump through the fourth diversion pipe to form a backwash device inside the membrane module, which can realize automatic online water washing and online chemical washing of the membrane module, reduce the labor intensity of system maintenance, and prolong the life of the membrane module. operating cycle.

The outlet of the produced water pump is connected to the reservoir or the return pipe, and the first diversion pipe, the second diversion pipe and the return pipe constitute the outlet water return structure. The concentration of ammonia nitrogen in the water eliminates the inhibition of high ammonia nitrogen on the microorganisms in the system, and can treat high ammonia nitrogen wastewater without pretreatment.

The aeration pipe is provided with a number of vertically upward perforations at equal intervals along the horizontal direction. Since the aeration pipe is placed horizontally, the vertical distance between the perforations and the membrane module is the same to achieve uniform aeration.

In order to control the vacuum degree and the flow rate in the second guide tube and the third guide tube, a vacuum gauge is provided on the second guide tube, and an air flow meter is provided on the third guide tube.

The beneficial effects of the utility model are:

1. High volume load, small footprint. The improved bio-augmented membrane bioreactor integrates membrane interception and biofilm immobilization technology, the number of effective microorganisms in the system is significantly increased, the volume load is high, and the occupied area can be significantly reduced. Simply modify the existing facilities, the sewage treatment capacity can be increased by 2-3 times, and the effluent water quality can be improved.

2. Oxygen has high mass transfer efficiency and low energy consumption. The improved bio-enhanced membrane bioreactor utilizes the collision and shear action of the fluidized filler in water to make air bubbles finer, increase the utilization rate of oxygen, and reduce energy consumption.

3. Membrane fouling rate is low. The improved bio-enhanced membrane bioreactor, combined with fluidized bed technology, immobilized microorganism technology, and online cleaning technology, improves the flow state in the reactor, reduces the concentration of membrane fouling substances in the system, delays the process of membrane fouling, and simultaneously fluidizes The repeated collision and contact between the suspended filler and the membrane surface is beneficial to reduce the fouling degree of the membrane surface and significantly reduce the membrane fouling rate.

4. Good denitrification effect. In the improved bio-enhanced membrane bioreactor, each fluidized filler has different biological species inside and outside, some anaerobic or facultative bacteria grow inside, and good bacteria grow outside, so that each carrier is a micro-reaction The device makes the nitrification and denitrification reactions exist at the same time, and the membrane interception and biofilm enrich the nitrifying bacteria, and the system has a good denitrification effect.

5. High degree of automation. The improved bio-enhanced membrane bioreactor has an automatic detection and alarm device for membrane filament breakage, an automatic sludge discharge device, and an automatic adjustment device for an aeration system, and has a high degree of automation, simple operation and maintenance, and low operating costs.

6. Can be cleaned and maintained online. The bio-enhanced membrane bioreactor has an online cleaning function, which can realize automatic online water washing, online chemical washing and online backwashing of the membrane module, significantly reduce the membrane fouling rate, and prolong the operating cycle of the membrane module.

[Description of drawings]

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

1. Shell; 2. Membrane module; 3. Fluidized lightweight filler particles; 4. First diversion pipe; 5. Raw water pump; 6. Second diversion pipe; 7. Produced water pump; 8. Exposure Air pipe; 9. The third diversion pipe; 10. Fan; 11. Mud discharge hole; 12. Vacuum gauge; 13. Air flow meter; 14. Backwash pump; 15. The fourth diversion pipe.

[Detailed ways]

Now with reference to the accompanying drawings and examples, the technical solution of the present utility model will be further elaborated, and it is believed that the bioreactor will be clear to those skilled in the art.

Example 1

Bioreactor in the utility model as shown in Figure 1:

First, a horizontal aeration pipe 8 is installed at the bottom of the housing 1, and several perforations on the aeration pipe 8 are vertically set up at equal intervals along the horizontal direction;

Secondly, the membrane module 2 is installed above the aeration pipe 8;

Then, a number of fluidized lightweight filler particles 3 are filled around the membrane module 2, and an aerobic bacteria layer is coated on the outside of the fluidized lightweight filler particles 3, and anaerobic bacteria or facultative bacteria are embedded in the fluidized lightweight filler particles 3. bacteria layer;

Finally, a takeover operation takes place. Connect the top side of the housing 1 to the outlet of the raw water pump 5 outside the housing through the first guide tube 4; connect the top of the membrane module 2 to the inlet of the produced water pump 7 through the second guide tube 6; The inlet end on one side is connected to the fan 10 outside the reactor shell through the third guide pipe 9, and a mud discharge hole 11 is opened on the corresponding shell side wall on the other side of the aeration pipe.

When using the above-mentioned bioreactor to treat wastewater in a certain factory’s living area, through the fluidized light biofilm filler installed in the MBR reactor, the microorganisms in the system can be attached to the fluidized filler as much as possible, reducing the system pressure. The concentration of suspended sludge in the medium reduces the contact probability between sludge particles and the membrane surface. At the same time, the repeated collision and contact between the fluidized light filler and the membrane surface is beneficial to reduce the degree of membrane surface pollution and reduce the membrane fouling rate.

And with the help of the collision and shearing of the fluidized filler in the water, the air bubbles are made smaller, the utilization rate of oxygen is improved, and the nitrification process is facilitated. When the concentration of NH ₃ -N in the water is 10-50mg/L, The effluent NH ₃ -N was maintained below 1.0 mg/L. At the same time, because each fluidized packing has different biological species inside and outside, some anaerobic or facultative bacteria grow inside, and good bacteria grow outside, so that each carrier is a micro-reactor, thus realizing Synchronous nitrification and denitrification, when the dissolved oxygen in the reactor is controlled between 1.0-1.5 mg/L, the total nitrogen can be removed by 50%-80%. It can be seen from the above examples that the utility model has low membrane fouling rate, low energy consumption and good denitrification effect.

As an optimization, a backwashing device inside the membrane module can also be added, that is, the backwash pump 14 is connected to the fourth guide pipe 15 at the tap end of the second guide pipe 6, so that automatic online water washing, online medicine washing and online cleaning of the membrane module can be realized. Backwashing reduces the membrane fouling rate and prolongs the operating cycle of the membrane module; a vacuum gauge 12 is added to the second diversion pipe 6, and an air flow meter 13 is installed on the third diversion pipe 9 to realize automatic sludge discharge and aeration system Automatic adjustment and other automatic operations.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (6)

1. An improved bio-augmented membrane bioreactor, comprising a housing, a water pump, a blower fan and a draft tube, characterized in that a membrane module is provided in the center of the housing, and a number of fluidized light weights are filled around the membrane module. The filler particles form an aerobic bacteria layer on the outside of the fluidized lightweight filler particles, and form an anaerobic or facultative bacteria layer on the inside of the fluidized lightweight filler particles, and the top side of the shell passes through the first diversion tube Connect to the outlet of the raw water pump outside the shell, the top of the membrane module is connected to the inlet of the product water pump through the second guide pipe, and a horizontal aeration pipe is arranged under the several fluidized light filler particles. One side inlet end of the air pipe is connected to the fan outside the reactor shell through the third guide pipe, and the other side of the aeration pipe corresponds to a mud discharge hole on the shell side wall. 2. A kind of improved bio-enhanced membrane bioreactor as claimed in claim 1, characterized in that one end of the tap of the second guide pipe is connected to the backwash pump through the fourth guide pipe to form a backwash device inside the membrane module . 3. A kind of improved bio-augmented membrane bioreactor as claimed in claim 1, it is characterized in that the outlet of the water production pump is connected to a reservoir or a return pipe, and the first flow guide pipe and the second flow guide pipe And the return pipe constitutes the water outlet return flow structure. 4. An improved bio-augmented membrane bioreactor as claimed in claim 1, characterized in that said aeration pipe is provided with several vertically upward perforations at equal intervals along the horizontal direction. 5. An improved bio-augmented membrane bioreactor as claimed in claim 1, characterized in that a vacuum gauge is provided on the second draft tube. 6. The improved bio-augmented membrane bioreactor according to claim 1, characterized in that an air flow meter is provided on the third guide pipe.

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