CN201386041Y - An aerobic granular sludge membrane bioreactor system - Google Patents

Abstract

An aerobic granular sludge membrane bioreactor system for treating organic wastewater belongs to the technical field of wastewater treatment. The utility model is a water treatment system which effectively combines the aerobic granular sludge technology in the biological treatment method with the membrane bioreactor technology, and solves the most prominent membrane pollution problem in the operation of the membrane bioreactor. The water treatment system has high volume load, less land occupation, good liquid-solid separation effect, fast sedimentation of sludge in granular form, high reactivity, simultaneous nitrification and denitrification, light membrane pollution and long service life. It can be used for water reuse in residential areas and buildings, hospital wastewater treatment, fecal wastewater treatment, advanced treatment of various high-concentration organic industrial wastewater, landfill/compost leachate treatment, and purification of slightly polluted drinking water.

Description

An aerobic granular sludge membrane bioreactor system

technical field

An aerobic granular sludge membrane bioreactor system for treating organic wastewater belongs to the technical field of wastewater treatment. Specifically, it is a water treatment system that effectively combines aerobic granular sludge technology in biological treatment methods with membrane bioreactor technology. The water treatment system has high volume load, less land occupation, good liquid-solid separation effect, fast sedimentation of sludge in granular form, high reactivity, simultaneous nitrification and denitrification, light membrane pollution and long service life. It can be used for water reuse in residential areas and buildings, hospital wastewater treatment, fecal wastewater treatment, advanced treatment of various high-concentration organic industrial wastewater, landfill/compost leachate treatment, and purification of slightly polluted drinking water.

Background technique

Since the reform and opening up, my country's economy has achieved unprecedented sustained high-speed growth. However, due to the rapid expansion of resource development and the rapid growth of energy consumption, my country's ecological damage and environmental pollution have reached a very serious level. In order to realize the sustainable development of our country's economy and society, we must resolve the contradiction between development and environmental protection.

At present, due to the rapid increase of population and the continuous development of social economy, not only the demand for water is greatly increased, but also the discharge of sewage is also increasing day by day. Many places in my country (such as the Taihu Lake Basin) have increased the water quality requirements for wastewater discharge. The traditional activated sludge method has been difficult to meet the continuously improving requirements in terms of multifunctionality, high efficiency, stability and economical rationality. In order to alleviate this contradiction, the development, research and application of new high-efficiency wastewater biological treatment technology has become an important topic in the field of water pollution control engineering research in all countries in the world.

Sewage aerobic biological treatment is the most important method and the most commonly used means of wastewater treatment. It is widely used in the purification and treatment projects of urban sewage and industrial wastewater. These technologies have been compared in terms of design theory and actual operation management. However, these technologies still have serious defects in terms of mass transfer efficiency, operation management, operating load and energy consumption, and the quality of effluent water cannot meet the discharge standards of regions with higher water quality requirements.

Membrane bioreactor is a highly efficient activated sludge wastewater treatment reactor that has only come out in recent years. After the sewage is treated in the activated sludge reactor, the water is discharged through the separation membrane, and the sludge (microorganisms) is retained. The intercepted sludge remains in the reactor, and the high-quality effluent can be reused for green irrigation, toilet flushing and agricultural irrigation, etc., realizing the resource utilization of wastewater. Compared with the traditional activated sludge method, the characteristics of the membrane bioreactor in the treatment of domestic sewage are: (1) The removal efficiency of pollutants is high, and the quality of the treated water is good. Not only the removal efficiency of suspended solids and organic matter is high, but also bacteria and viruses can be removed, and the effluent can be directly reused; (2) The microorganisms can be completely trapped in the bioreactor, and the hydraulic retention time of the reactor and the sludge age can be achieved. Complete separation; (3) The concentration of microorganisms in the bioreactor is high, the volume load of the device is large, the sludge output is low, and the equipment occupies less land.

Membrane components in membrane bioreactors are prone to fouling and clogging, and frequent cleaning and replacement lead to increased operating costs, which is an important reason that limits the wide application of membrane bioreactors. The utility model combines aerobic granular sludge technology and membrane bioreactor technology to develop a new type of aerobic granular sludge membrane bioreactor system, which not only has all the advantages of membrane bioreactor, but also strengthens the nitrification reaction The nitrification and denitrification process, more importantly, greatly reduces membrane pollution and reduces operating costs. Because the larger the sludge particle size, the smaller the net migration rate to the membrane surface, and the harder it is for the particles to deposit on the membrane surface. Compared with ordinary activated sludge, the gel layer formed has a larger porosity and Poor compressibility, so the mass transfer resistance caused by it is smaller than that of ordinary activated sludge, and the particle size of aerobic granular sludge is much larger than the pore size of the membrane. Severe membrane fouling, so larger particles of sludge can effectively reduce the possibility of adsorption of pollutants on the inner wall of membrane pores and blockage of membrane pores.

Utility model content

The purpose of this utility model is to provide an aerobic granular sludge membrane bioreactor system, and to develop an aerobic granular sludge with high volume load, small footprint, light membrane pollution, long service life and wide application range Membrane Reactor (GMBR).

The technical scheme of the utility model: a fully automatic high-efficiency wastewater treatment device composed of a new type of aerobic granular sludge membrane bioreactor and a computer monitoring system. In conjunction with accompanying drawing 1, the utility model is described as follows:

The wastewater treatment device of the utility model is a fully automatic and efficient wastewater treatment device composed of an aerobic granular sludge membrane bioreactor and a computer monitoring system. The device consists of a control system 1, a water inlet 2, a grid 3, and a liquid level indicator. device 4, membrane module 5, guide tube 6, aeration pipe 7, pressure sensor 8, liquid flow meter 9, drain port 10, water outlet 11, suction pump 12, gas flow meter 13, blower 14, in the reaction The middle part of the reactor is provided with a guide cylinder 6, and the guide cylinder is suspended and fixedly connected with the reactor at the position of the central axis of the reactor through a bracket. An aeration tube 7 is installed under the guide tube, and the aeration tube 7 is connected to the peripheral blower 14 through a pipeline, and compressed air is blown in, and the pipeline connecting the aeration tube 7 and the blower 14 is provided with a gas flow meter 13 metering drum The amount of gas entering; the water inlet 2 is connected to the external water inlet pump and/or circulation pump, and the waste water and/or circulating water are pumped in, and the pumped waste water and/or circulating water are filtered through the grille 3 to remove larger solids After the material flows into the outside of the guide tube 6 in the reactor, the air exposed from the aeration tube 7 below the guide tube 6 pushes the liquid in the guide tube 6 to move upwards, so that the gas and liquid are mixed, and the transmission is strengthened. The inner liquid phase is upward, and after exiting the guide tube 6, it moves downward outside the guide tube 6 to form a circulation, and flows into the lower part of the guide tube 6 together with the wastewater filtered by the grid 3 . A membrane module 5 is installed inside the guide tube 6 . The top of the membrane module 5 is connected to the suction pump 12 by a pipeline, and the water extracted by the suction pump 12 is discharged from the water outlet 11. The pipeline connecting the membrane module 5 and the suction pump 12 is provided with a liquid flow meter 9 to measure the amount of water extracted. A pressure sensor 8 is also provided on the pipeline connecting the membrane module 5 and the suction pump 12 to measure the membrane pressure. Three drains 10 are provided at different heights on the side of the reactor for drainage, sampling and sludge discharge during aerobic granular sludge cultivation. A liquid level indicator 4 is provided in the reactor to control the liquid level in the reactor. The liquid level indicator 4, the pressure sensor 8, the suction pump 12, and the blower 14 are all connected to the control system 1 and controlled by the control system.

The volume of the reactor is 2L-2000m ³ , the height-to-diameter ratio (H/D) of the reactor is between 1:2-5:1; the ratio of the diameter of the draft tube to the diameter of the reactor (D _E /D) is 0.6-0.8 Between; the size of the guide tube from the bottom is within the range of 100-500mm.

The reactor of the utility model can be made of steel plate, glass or other materials. The main feature of the aerobic granular sludge membrane bioreactor is that the activated sludge in the reactor exists in granular form, the sludge settles quickly, the reaction activity is high, it can simultaneously nitrify and denitrify, the membrane pollution degree is light, and the service life of the membrane is long. There is a diversion tube in the reactor to make the liquid in the reactor form a circulation, so that the sludge with large particles and good settling properties can be kept in the guide tube, while the fine sludge with poor settling properties is carried by the circulation. to the outside of the draft tube and drained from the drain; these structures strengthen the mass transfer process of organic matter and granular sludge, so they have a higher organic load, the processing capacity of the reactor is improved, and the efficiency of the reactor is greatly improved; the reaction The impact resistance of the device against adverse conditions is enhanced.

At the same time, it is connected to the computer through the data line, and the liquid level, membrane pressure, suction pump and blower in the reactor are automatically controlled and detected by the computer system. The high degree of automation greatly reduces the labor intensity.

This device can be used not only for water reuse in residential areas and buildings, but also for hospital wastewater treatment, fecal wastewater treatment, advanced treatment of various high-concentration organic industrial wastewater, and landfill/compost leachate treatment, because it can Used for purification of slightly polluted drinking water.

Description of drawings

Figure 1 is a structural diagram of an aerobic granular sludge membrane bioreactor (GMBR).

1. Control system, 2. Water inlet, 3. Grille, 4. Liquid level indicator, 5. Membrane module, 6. Diversion barrel, 7. Aeration tube, 8. Pressure sensor, 9. Liquid flow meter, 10. Water outlet, 11. Water outlet, 12. Suction pump, 13. Gas flow meter, 14. Blower.

Detailed ways

Below by embodiment the utility model is given further detailed description.

Example 1: Granular sludge cultivation of GMBR

Add activated sludge into the reactor, control the pH between 7.0 and 8.5, change the system COD volume load between 0.5 and 2.0kg/m ³ .d, control the amount of aeration, and discharge fine sludge from the outlet intermittently. Aggregates with a relatively compact structure appeared after 3-4 days, and aerobic granular sludge gradually appeared after 8 days. On this basis, by controlling the aeration rate and sludge discharge, the flocculent sludge with poor settling performance is continuously washed out, and the reactor is dominated by granular sludge. It has been determined that the aerobic granular sludge in the reactor has a good treatment effect on COD and NH ₃ -N in wastewater.

Example 2: Comparison of GMBR effluent quality with relevant national standards

Using GMBR to treat domestic sewage, the effluent water quality is better than the standard for reuse water (toilet toilet flushing and vehicle flushing) formulated by the state and relevant departments.

Claims (3)

1. an aerobic granular sludge membrane bioreactor system for processing organic waste water is characterized in that the waste water treatment system is a fully automatic high-efficiency wastewater treatment device composed of an aerobic granular sludge membrane bioreactor and a computer monitoring system. The device is composed of control system (1), water inlet (2), grille (3), liquid level indicator (4), membrane module (5), guide tube (6), aeration tube (7), pressure Sensor (8), liquid flow meter (9), water outlet (10), water outlet (11), suction pump (12), gas flow meter (13), blower (14) constitute, in the middle of the reactor There is a guide tube (6), which is suspended and fixedly connected with the reactor at the central axis of the reactor through a bracket, and an aeration tube (7) is installed under the guide tube, and the aeration tube (7) passes through the pipe and the outer The provided blower (14) is connected to blow compressed air, and the pipeline connected to the aeration pipe (7) and the blower (14) is provided with a gas flow meter (13) to measure the amount of gas blown in, and the water inlet (2) and the outer The water inlet pump and/or circulating pump are connected to pump waste water and/or circulating water, and the pumped waste water and/or circulating water are filtered through the grille (3) to remove larger solids and then flow into the reactor for diversion The outside of the tube (6), the air exposed by the aeration tube (7) below the guide tube (6), pushes the liquid in the guide tube (6) to move upward, and the liquid in the guide tube (6) moves downward The movement forms a circulation, and flows into the lower part of the guide tube (6) together with the waste water filtered by the grid (3). The inside of the guide tube (6) is equipped with a membrane module (5), and the top of the membrane module (5) A pipeline is connected to the suction pump (12), and the water pumped by the suction pump (12) is discharged from the water outlet (11). A liquid flow meter ( 9) Measure the amount of water pumped out. A pressure sensor (8) is provided on the pipe connecting the membrane module (5) and the suction pump (12) to measure the membrane pressure. Three outlets (10) are provided at different heights on the side of the reactor. , used for drainage, sampling and sludge discharge during aerobic granular sludge cultivation, a liquid level indicator (4) is provided in the reactor to control the liquid level in the reactor, the liquid level indicator (4), pressure sensor (8), suction pump (12), air blower (14) all link to each other with control system (1), are controlled by control system (1). 2. The aerobic granular sludge membrane bioreactor according to claim 1, characterized in that the reactor is provided with a guide tube, and the liquid in the reactor forms a circulation inside and outside the guide tube. 3. The aerobic granular sludge membrane bioreactor according to claim 1, characterized in that the reactor volume is 2L-2000m ³ , and the height-to-diameter ratio (H/D) of the reactor is 1:2-5:1 Between; the ratio of the diameter of the draft tube to the diameter of the reactor (D _E /D) is between 0.6-0.8; the distance between the draft tube and the bottom is within the range of 100-500mm.

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