CN202610021U - External anaerobic membrane bioreactor - Google Patents

Abstract

The utility model discloses an external anaerobic membrane bioreactor, which comprises an adjusting tank, an anaerobic bioreactor and a membrane box. A water distribution pipe is arranged at the bottom of the anaerobic bioreactor, and a three-phase separator is arranged on the upper part of the anaerobic bioreactor. A sludge circulating pump communicated with the anaerobic bioreactor is arranged outside the anaerobic bioreactor. A microporous exposure device is arranged at the bottom of the membrane box, and an ultrafiltration bundle membrane component is arranged in the membrane box. The adjusting tank is connected with the water distribution pipe of the anaerobic bioreactor through a suction pump. A water outlet pipe of the anaerobic bioreactor is connected with a water inlet pipe on the upper part of the membrane box. A sewage pipe on the lower part of the membrane box is communicated with the water distribution pipe of the anaerobic bioreactor through a circulating pump. According to the bioreactor, sludge loss can be effectively prevented, sludge age can be prolonged, and microorganisms can be easily enriched. The polluted condition of a membrane can be effectively alleviated by nitrogen flushing, the life cycle of the membrane component can be prolonged, the cleaning cost of the membrane component can be saved, and secondary pollution in a cleaning process can be reduced. The bioreactor is simple in structure, easy to operate and applicable to the treatment of high-concentration organic wastewater.

Description

An external anaerobic membrane bioreactor

technical field

The utility model relates to an external anaerobic membrane bioreactor, which is suitable for the treatment of high-concentration organic waste water.

Background technique

Membrane bioreactor (MBR) combines membrane separation technology with biological treatment technology. While effectively removing pollutants, it also traps biomass in the reactor, overcoming the phenomenon of biomass loss in traditional biological treatment technologies. . According to different types of bioreactors, MBR can be divided into aerobic MBR and anaerobic MBR. Among them, aerobic MBR is mainly used in municipal wastewater and other wastewater with low organic load and high biodegradability, while for industrial wastewater with high organic load Waste water is difficult to use due to the high cost of its aeration process. In contrast, anaerobic MBR is more suitable for the treatment of high-concentration organic wastewater due to its lower energy consumption. Generally speaking, an anaerobic MBR reactor is composed of a bioreactor and an external membrane module. Due to the high concentration of sludge in the anaerobic bioreactor, the surface of the membrane module is easy to accumulate sludge during long-term operation, resulting in membrane fouling. , so that the MBR treatment effect is reduced. At the same time, chemicals are often used in the process of cleaning membrane fouling, which is easy to cause secondary pollution.

Contents of the invention

The purpose of the utility model is to provide an external anaerobic membrane bioreactor which occupies a small area, saves equipment operating costs, can treat high-concentration organic wastewater, and can effectively reduce membrane pollution.

The external anaerobic membrane bioreactor of the utility model includes a regulating tank, an anaerobic bioreactor and a membrane box. The bottom of the anaerobic bioreactor is provided with a water distribution pipe, the upper part is equipped with a three-phase separator, and the top is provided with an air outlet. , there is a sludge circulation pump outside the anaerobic bioreactor, and the inlet and outlet of the sludge circulation pump are connected with the anaerobic bioreactor. The bottom of the membrane box has a microporous aeration device, and the top is equipped with an exhaust port. Equipped with an ultrafiltration bundle membrane module, the top of the ultrafiltration bundle membrane module is connected with the second suction pump, the regulating tank is connected with the water distribution pipe of the anaerobic bioreactor through the first suction pump, and the anaerobic bioreactor The outlet pipe is connected with the water inlet pipe at the upper part of the membrane box, and the sewage pipe at the lower part of the membrane box is connected with the water distribution pipe of the anaerobic bioreactor through the circulating pump.

The bundled ultrafiltration membrane module mentioned in the utility model can adopt a bundled ultrafiltration hollow fiber membrane, and the surface area of the membrane is 0.07m ² .

The anaerobic bioreactor is equipped with a three-phase separator, which can effectively separate the liquid phase, gas phase and solid phase in the anaerobic bioreactor, reduce the sludge concentration in the effluent of the anaerobic bioreactor, and slow down the phenomenon of membrane fouling .

A sludge circulation pump is connected to the outside of the anaerobic bioreactor, and the mud and water are fully mixed through the hydraulic turbulence in the circulation process.

With the progress of the membrane filtration process, the organic concentration of the wastewater in the membrane box gradually increases. In order to control the organic concentration of the wastewater in the membrane box, the sewage pipe at the bottom of the membrane box is connected to the water distribution pipe of the anaerobic bioreactor through the circulation pump, so that the membrane The high-concentration wastewater and sludge in the tank are returned to the anaerobic bioreactor for circular reaction.

During the membrane filtration process, nitrogen gas is continuously fed through the microporous aeration device at the bottom of the membrane box to wash away the sludge accumulated on the ultrafiltration bundle membrane modules and reduce membrane fouling.

The advantage of device of the present invention is:

The reactor can effectively prevent sludge loss, increase the sludge age, and facilitate the enrichment of microorganisms. Nitrogen flushing can effectively reduce membrane pollution, increase the service life of membrane modules, save the cost of cleaning membrane modules and secondary pollution caused during the cleaning process. The reaction device has a simple structure, is easy to operate, and is suitable for the treatment of high-concentration organic wastewater.

Description of drawings

Fig. 1 is a schematic structural diagram of an external anaerobic membrane bioreactor.

Detailed ways

Below in conjunction with accompanying drawing and embodiment further illustrate the utility model.

With reference to Fig. 1, the external anaerobic membrane bioreactor of the present utility model comprises regulating pool 1, anaerobic bioreactor 3 and membrane box 7, and the bottom of anaerobic bioreactor is provided with water distribution pipe 4, and three-phase The separator 5 has an air outlet on the top, and there is a sludge circulation pump 6 outside the anaerobic bioreactor. The inlet and outlet of the sludge circulation pump 6 are connected to the anaerobic bioreactor. The bottom of the membrane box 7 has micropore The aeration device 8 has an exhaust port 11 on the top, and an ultrafiltration bundle membrane module 9 is installed inside. The top of the ultrafiltration bundle membrane module 9 is connected to the second suction pump 10, and the regulating tank 1 is pumped through the first suction pump. The pump 2 is connected to the water distribution pipe 4 of the anaerobic bioreactor 3, the outlet pipe of the anaerobic bioreactor 3 is connected to the water inlet pipe at the upper part of the membrane box 7, and the sewage pipe at the lower part of the membrane box 7 passes through the circulating pump 12 to react with the anaerobic organism The water distribution pipe 4 of the device is connected.

The high-concentration organic wastewater in the regulating tank 1 enters the anaerobic bioreactor 3 through the first suction pump 2, and after the influent water is evenly distributed by the water distributor 4, it flows upward through flocculent or granular sludge. sludge bed. The muddy water is fully mixed by the hydraulic turbulence generated by the sludge circulation pump 6, and the hydraulic retention time of the entire anaerobic bioreactor is 4 days. The rising mud-water mixture passes through the three-phase separator 5, and the sludge settles under the action of gravity, and the generated biogas is discharged from the top of the three-phase separator 5 through the gas outlet of the anaerobic bioreactor, and the supernatant enters the membrane box 7 through the pipeline In the process, after the membrane module 9 is completely submerged, water is drawn from the top of the membrane module by the second suction pump 10 . During the water pumping process, nitrogen gas is introduced from the microporous aeration device 8 at the bottom of the membrane box 7 to flush the membrane module 9 and slow down the membrane fouling through the cross-flow formed on the membrane surface. The concentrated liquid and sludge in the membrane box enter the anaerobic bioreactor 3 through the circulation pump 12 to carry out circulation reaction. The working cycle of the suction pump was 8 minutes on and 2 minutes off. During the pumping period, the membrane flux was maintained at 60 KPa at the transmembrane pressure difference, the nitrogen feeding frequency was 1 h/d, and the flow rate was controlled at 0.1 m ^{3 /} h. During the operation, the COD removal rate of the effluent was stable at more than 85%. In addition, because the membrane module can effectively prevent the loss of sludge, the sludge concentration in the anaerobic bioreactor increased from 7000 mg/L at the time of inoculation to 12000 mg/L. Under the action of nitrogen flushing, the membrane fouling phenomenon is greatly reduced, and the flux of the effluent membrane remains at 65% of the initial flux during long-term operation, which is about 20 L/m ² .h, which effectively improves the membrane flux. The life cycle of the components has a good application prospect in the treatment of high-concentration organic wastewater such as bamboo product wastewater and beer wastewater.

Claims (2)

1. An external anaerobic membrane bioreactor, which is characterized in that it includes a regulating tank (1), an anaerobic bioreactor (3) and a membrane box (7), and the bottom of the anaerobic bioreactor is provided with a water distribution pipe ( 4), the upper part is equipped with a three-phase separator (5), and the top is provided with an air outlet. There is a sludge circulation pump (6) outside the anaerobic bioreactor. The inlet and outlet of the sludge circulation pump (6) are connected to the anaerobic The bioreactors are connected, the bottom of the membrane box (7) has a microporous aeration device (8), the top is equipped with an exhaust port (11), and the ultrafiltration bundle membrane module (9) is installed inside, and the ultrafiltration bundle membrane The top of the component (9) is connected to the second suction pump (10), and the regulating tank (1) is connected to the water distribution pipe (4) of the anaerobic bioreactor (3) through the first suction pump (2). The outlet pipe of the bioreactor (3) is connected with the water inlet pipe at the upper part of the membrane box (7), and the sewage pipe at the lower part of the membrane box (7) is connected with the water distribution pipe (4) of the anaerobic bioreactor through the circulating pump (12). 2. The external anaerobic membrane bioreactor according to claim 1, characterized in that the ultrafiltration bundle membrane module (9) is a bundle ultrafiltration hollow fiber membrane with a membrane surface area of 0.07m ² .

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