WO2023124203A1 - Inverted a2/o-gdmbr integrated village and town sewage treatment apparatus with external electric field, and sewage treatment method thereof - Google Patents

Abstract

The present invention belongs to the technical field of village and town sewage treatment. Provided are an inverted A2/O-GDMBR integrated village and town sewage treatment apparatus with an external electric field, and a sewage treatment method thereof. The present invention aims to solve the problems of existing village and town sewage treatment, i.e. a low carbon-nitrogen ratio, high energy consumption, a large operation and maintenance amount, a poor water purification effect, and instability. The apparatus comprises an inverted A2/O tank housing, a cathode electrode, an anode electrode, a mechanical stirring and lifting mechanism, a first aeration component, an adjustable-angle baffle plate, an inclined flow guide plate, an arc-shaped flow guide plate, a GDMBR tank, a membrane component, a second aeration component, a water collection tank, an air pump, a return pump and a solar power supply apparatus. By means of the research and development of a new configuration, the present invention achieves the three purposes of aeration, i.e. the three functions of oxygenation, nitrification liquid circulation and sludge backflow achieved by aeration are integrated; a rotary microelectrode is used to achieve the function of three-phase quick separation of gas, liquid and solid while providing low-voltage regulation and control for microorganisms, thereby enhancing nitrogen and phosphorus removal; and the apparatus has the advantages of a high water purification efficiency, a low energy consumption and ease of operation.

Description

An inversion A of an applied electric field 2/O-GDMBR integrated village sewage treatment device and method technical field

The invention belongs to the technical field of village and town sewage treatment, and relates to an inverted A ² /O-GDMBR integrated village and town sewage treatment device and method with an external electric field.

Background technique

With economic development and the continuous advancement of new rural construction, rural living standards have been greatly improved, and the production of domestic sewage is also increasing. Rural domestic sewage has become an important factor affecting the safety of surface water environments. Compared with cities, sewage treatment in rural areas has significant regional differences and differences in water quality and quantity, and the construction of sewage treatment facilities is seriously lagging behind, and treatment is slow. Most areas have no sewage treatment facilities, and some of the built treatment facilities also have design problems. Unreasonable, low operating efficiency, high energy consumption, lack of professional operation and maintenance personnel and other common problems. Therefore, the current collection and treatment rate of rural sewage is extremely low, and most domestic sewage is directly discharged without any treatment, causing large-scale pollution of rivers and ponds, causing huge impact on the local ecological environment, causing inconvenience to the life and production of rural residents, and seriously Restricted the local economic development and the improvement of the quality of life. In view of the status quo of rural sewage treatment, the problems existing in the application of conventional centralized treatment technologies in rural areas, and the characteristics of rural areas and sewage water quality and water volume, rural sewage treatment must be collected and treated from the source of pollution, and cannot be treated in a centralized manner like cities. solve. The distribution of rural sewage has the characteristics of many points, small volume, high dispersion, complex water quality, and large coefficient of variation. Therefore, rural sewage treatment technology must be mobile, flexible, easy to operate, low energy consumption, low maintenance, no need for special supervision, and can realize unmanned The process characteristics such as long-term stable operation under on-duty conditions can effectively solve the problem of rural sewage treatment in my country.

The existing membrane bioreactor (MBR) is a new type of high-efficiency sewage treatment technology that combines sewage biological treatment with membrane separation. It has the advantages of good sewage treatment effect, small footprint, high degree of automation, and low sludge yield. And other advantages, it can be used as the preferred process for sewage treatment in villages and towns. However, the traditional single MBR process is unsatisfactory in terms of synchronous denitrification and phosphorus removal, and the membrane fouling is serious, requiring frequent cleaning; in the process of operation, long-term high-intensity aeration, frequent hydraulic backwashing and regular Chemical cleaning, which will bring greater energy consumption and higher operating costs. Therefore, it is necessary to design a novel sewage treatment device to solve the above problems.

Contents of the invention

In view of this, the present invention aims to propose an inverted A ² /O-GDMBR integrated village and town sewage treatment device and method with an external electric field. Through the research and development of a new configuration, one gas and three functions are realized, namely, aeration, oxygenation, and nitrification liquid circulation. It integrates the three functions of sludge reflux and adopts the rotary microelectrode to provide low-voltage regulation to microorganisms while realizing gas-liquid-solid three-phase rapid separation function to strengthen nitrogen and phosphorus removal. It has high water purification efficiency, low energy consumption, and easy operation. The advantage of simplicity is a reliable process for solving rural sewage treatment in the future.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

An inverted A ² /O-GDMBR integrated village and town sewage treatment device with an external electric field, including an inverted A ² /O box shell, cathode electrode, anode electrode, mechanical stirring and lifting mechanism, first aeration component, adjustable angle barrier plate, inclined deflector, curved deflector, GDMBR box, membrane module, second aeration module, water collection tank, air pump, return pump and solar power supply device, the inverted A ² /O box shell In order to seal the box shell, the GDMBR box is an open top box, and the air pump, return pump and solar power supply device are all arranged outside the inverted A ² /O box shell, and the water collection tank Set outside the GDMBR box, the air pump, anode electrode, cathode electrode, mechanical stirring lifting mechanism and return pump are all powered by solar power supply devices;

The interior of the inverted A ² /O box shell is divided into anoxic zone, anaerobic zone and aerobic zone sequentially by the first partition and the second partition arranged in parallel inside the inverted A ² /O box shell, said The upper end of the first partition is arranged higher than the upper end of the second partition, the anoxic zone communicates with the bottom of the anaerobic zone, the upper part of the anaerobic zone communicates with the aerobic zone, and the upper part of the anoxic zone passes through The water inlet is connected with the external water inlet pipe, the cathode electrode is arranged in the anoxic zone, the anode electrode is arranged in the cathode electrode, and the mechanical stirring lifting mechanism is arranged in the anaerobic zone;

The first aeration assembly is set in the aerobic zone, the upper end of the inclined deflector is fixedly connected to the upper end of the first partition, and the lower end of the inclined deflector extends into the aerobic zone and the adjustable angle baffle The upper end of the curved deflector is fixed on the top wall of the housing, and the lower end is a free end. Form a return channel;

The interior of the GDMBR box is divided into a conditioning area and a membrane filtration area by two partitions arranged staggered in the GDMBR box. The upper outlet of the aerobic area is connected to the upper part of the conditioning area through a connecting pipe, and the bottom of the conditioning area is through a return pipe. It communicates with the upper part of the anoxic zone, the second aeration module and the membrane module are arranged in the membrane filtration area, and the second aeration module is arranged under the membrane module, and the outlet pipe of the membrane module is connected to the water collection tank, and the membrane module An exhaust assembly and a water outlet valve are arranged on the water outlet pipe of the assembly, the air inlet pipe of the first aeration assembly and the air inlet pipe of the second aeration assembly are connected with an air pump, and an air inlet pipe is provided on the air inlet pipe. valve;

When the first aeration component is aerated, part of the sludge and liquid in the aerobic zone will flow back to the anoxic zone along the return channel, and the other part of the mixed liquid will enter the adjustment area through the connecting pipe after passing through the inclined fender, and the sediment in the adjustment area Part of the sludge returns to the upper part of the anoxic zone through the return pipe and the return pump, and part of it is discharged regularly; the mixed solution pre-sedimented in the adjustment zone enters the membrane filtration zone, driven by gravity, the mixed solution is filtered through the membrane module, and the water is discharged After entering the water collection tank, the second aeration component aerates and scours the membrane components.

Further, the return channel is connected to the return port of the anoxic area, and the return port is arranged directly opposite to the water inlet of the inverted A ² /O box shell; an exhaust port is provided on the top of the anoxic area, and the exhaust port is higher than the top of the pool 30-200cm.

Further, inclined fenders are provided at the bottom of the anoxic zone, the bottom of the anaerobic zone, the bottom of the aerobic zone, the bottom of the regulating zone and the bottom of the membrane filtration zone.

Further, the lower end of the inclined deflector is hinged to the upper end of the adjustable angle baffle, and the circulation and reflux ratio is controlled by adjusting the opening and closing angle of the adjustable angle baffle.

Further, the distance between the cathode electrode and the anode electrode is 0.3-10cm; the material of the cathode electrode is carbon cloth, carbon felt or graphite plate carbon-based material and stainless steel mesh, nickel foam or titanium plate non-precious metal material; the anode electrode The material is graphite carbon brush, graphite rod, graphite plate or carbon felt carbon-based material; the electrode adopts a rotary structure, and the cylindrical shape formed by the cathode electrode maintains a fixed distance from the anode electrode.

Further, the solar power supply device is electrically connected to a controller, and the controller is electrically connected to the cathode electrode and the anode electrode, and the applied voltage is controlled to be 0.1-5.0V.

Further, when the mechanical agitation and lifting mechanism in the anaerobic zone strengthens the push flow, it is opened, and the first aeration component is installed at the bottom of the aerobic zone, and the aeration provides the driving force of the airflow while controlling the dissolved oxygen at 2-4mg/L; The bottom of the membrane filtration area is equipped with a second aeration component, which is programmed to aerate and form microbubbles to oxygenate and flush the membrane components.

Further, a perforated sludge discharge pipe is respectively provided at the bottom of the aerobic zone, the bottom of the adjustment zone and the bottom of the membrane filtration zone, and a vent valve is provided on each perforated sludge discharge pipe; the perforated sludge discharge pipe And the vent valve is used to discharge the sedimented mud in the device; part of the sludge in the conditioning area is periodically returned to the anoxic area.

Further, the GDMBR adopts a submerged membrane module, which can be a flat membrane or a hollow fiber membrane, and the material can be cellulose acetate, cellulose acetate, polyethylene, polysulfone or polyamide; the membrane module adopts Driven by low-pressure gravity flow, the working pressure is 5-100KPa, without hydraulic cleaning and chemical cleaning devices, and the water is continuously discharged.

A sewage treatment method of an inverted A ² /O-GDMBR integrated village sewage treatment device with an external electric field, specifically comprising the following steps:

Initially, the raw water to be treated enters the anoxic zone of the device from the water inlet, flows through the low-voltage electric field formed by the cathode electrode and the anode electrode, and then enters the anaerobic zone from the bottom of the first partition, and then the water is lifted by the mechanical agitation lifting mechanism. Lifting from the top of the second partition into the aerobic zone, under the return flow force provided by the first aeration component in the aerobic zone, a part of the sludge and return liquid are guided by the arc-shaped deflector and returned from the return channel to the Anoxic zone; the other part of the mixed liquid enters the GDMBR tank through the connecting pipe after passing through the large-angle inclined fender, and part of the sludge settled in the adjustment zone returns to the upper part of the anoxic zone through the return pipe and the return pump, and the other part is discharged regularly The mixed solution pre-sedimented in the conditioning area enters the membrane filtration area, the second aeration component oxygenates and flushes the membrane module, and the water entering the membrane filtration area is filtered by the membrane module and then enters the water collection tank through the outlet pipe;

During operation, the raw water to be treated and the return sludge deposited in the conditioning area enter the anoxic area of the device from the water inlet, and the sludge and return liquid returned from the aerobic area through the return channel pass through the cathode stainless steel mesh and the anode carbon brush together. The effect of the low-voltage electric field, the mixed water after the action of the low-voltage electric field enters the anaerobic zone from the bottom of the first partition, and then is lifted by the mechanical stirring lifting mechanism to lift the mixed water from the top of the second partition into the aerobic zone. Under the reflux power provided by the first aeration component, a part of the sludge and reflux liquid is returned to the anoxic zone through the reflux channel to rejoin the raw water to be treated newly entering the device; another part of the sludge and reflux liquid is again passed through The large-angle inclined fender enters the GDMBR tank through the connecting pipe, and the sludge deposited in the adjustment area flows back to the upper part of the anoxic area through the return pipe and the return pump to rejoin the raw water to be treated in the newly entered device; The pre-sedimented mixed solution in the conditioning area is filtered through the membrane module and then enters the water collection tank from the outlet pipe; such a circulation backflow finally completes the treatment of sewage;

During normal operation, when the mud discharge period is reached, the aeration of the first aeration assembly and the second aeration assembly is stopped for a period of time, and the perforated mud discharge pipe is opened to discharge the mud, and the device restarts after the mud discharge is completed.

Compared with the prior art, the inverted A ² /O-GDMBR integrated village sewage treatment device with external electric field described in the present invention has the following advantages:

(1) The device applies a low-intensity electric field (0.1-5.0V) in the anoxic area to realize the mutual conversion between biological energy, chemical energy and electrical energy, and regulate the metabolic behavior, physiological function, cell morphology and surface characteristics of microorganisms. Thereby increasing the diversity of microbial populations, changing the properties of the sludge mixture, and accelerating the activation reaction intensity of enzymes. From a macro perspective, it is manifested in the enhancement of the absorption of organic nutrients by microorganisms, promoting the degradation of pollutants, improving the effect of denitrification and strengthening microorganisms. removal of pollutants. Compared with general electric bioreactors, the power consumption is small.

(2) The cathode and anode of the device can be made of a variety of electrode materials, and have a wide range of applications. Different from traditional common electrodes, this device adopts a rotary structure electrode, so that the anode electrode can not only transfer electrons but also have a large contact area with the mixed solution, and also It can play the function of quick separation of gas-liquid-solid three-phase, degas quickly, reduce dissolved oxygen, promote the denitrification process, and the gas is discharged from the exhaust port; the cylindrical shape formed by the cathode electrode maintains a fixed small distance from the anode , improve electron transfer efficiency.

(3) In the anaerobic zone, the device can use a mechanical stirring lifting mechanism or a push-flow device to mix and lift the mixed liquid in the anaerobic zone to promote anaerobic denitrification and phosphorus release.

(4) The device arranges aeration facilities in the aerobic area, and the tiny air bubbles produced oxygenate the aerobic area, providing sufficient dissolved oxygen of about 2-4 mg/L for microorganisms, and promoting microbial nitrification and phosphorus absorption; The gas also provides power for the nitrifying liquid and the return flow of the sludge.

(5) The reflux of nitrification liquid and sludge in this device relies on aeration at the bottom of the device, and only a mechanical stirring lifting mechanism or a push-flow device is installed in the anaerobic area (open when it needs to strengthen reflux) to save energy consumption, and at the same time adjust the opening of the baffle The flow state and flow field of the fluid can be changed by combining angles, so as to change the different cycle-reflux ratios, so as to cope with the impact of changes in water quality, water quantity, and temperature on denitrification, and maintain the best operating state.

(6) The device is equipped with an arc-shaped deflector on the upper part of the aerobic area to realize the adjustment of the movement law of water and gas, and achieve the purpose of one gas with three functions (oxygenation, sludge return, and digestive liquid circulation). The mixture escapes from the outlet, and the mixed liquid is smoothly returned to the anoxic zone under the push of the airflow to mix with the raw water and the return sludge.

(7) The device is equipped with an inclined deflector in the middle and upper part of the anaerobic zone, and the nitrifying liquid flows back to the anoxic zone through the internal return channel. The high flow rate and the disturbance of air bubbles make the influent quickly and evenly distributed; at the same time, the high concentration of organic matter in the influent can quickly consume the dissolved oxygen in the water and promote the rapid formation of an anaerobic environment.

(8) The device is equipped with an inclined fender with a slightly larger angle at the lower part of the aerobic zone. The large angle can effectively prevent the sludge from floating up, realize good sedimentation conditions, minimize the sludge entering the GDMBR tank with the effluent, and ensure the inverted A ² /O The sludge concentration in the tank is stable and the subsequent membrane fouling is reduced.

(9) The device is equipped with a regulating area in the GDMBR, and the influent water is pre-sedimented first to reduce the amount of sludge entering the membrane filtration area to reduce membrane pollution.

(10) The device adopts submerged membrane modules, which can be used in various types such as flat membranes and hollow fiber membranes, and various materials such as cellulose acetate, cellulose acetate ester, polyethylene, polysulfone or polyamide. The membrane has a wide range of applications, and the device is compact and small in size; the high-efficiency interception effect of the membrane enables microbial interception in the reactor to achieve complete separation of hydraulic retention time (HRT) 6-8h and sludge age (SRT) 5-15d , so that the operation control is more flexible and stable; the concentration of microorganisms in the device is high, and the impact load resistance is strong.

(11) The membrane module of the device is driven by low-pressure gravity flow, the working pressure is 5-100KPa, the power consumption of the outlet water is low, the energy consumption is saved, and the requirements for the inlet water pressure of equipment, pipelines and accessories are reduced.

(12) The device adopts a filtration mode without hydraulic cleaning and chemical cleaning. Compared with the traditional MBR process, which requires regular cleaning and complicated operation and maintenance, it greatly reduces operating costs and workload; at the same time, it does not inhibit the growth of microorganisms on the surface of the membrane module. And use the action of microorganisms to strengthen the removal effect of pollutants, improve the quality of effluent water, alleviate membrane fouling, and increase water production.

(13) The device uses procedural aeration measures to clean the membrane modules, sustainable, intermittent or pulse aeration, which can effectively control membrane fouling while saving aeration energy consumption; and adopts a microbubble aeration device to obtain Higher cross flow velocity and lower rising resistance, good cleaning effect on the membrane components without damaging the membrane components.

(14) The device adopts a special exhaust device to remove the gas accumulated in the pipeline, which can be manually or automatically exhausted to ensure smooth water outlet. The exhaust device can directly observe and detect the gas accumulation in the pipeline, has a good exhaust effect, is more intuitive than ordinary exhaust valves, reduces the number of exhausts, and simplifies the operation process.

(15) The device uses a solar battery integrated power supply system to provide the electric energy required by the external electric field, aeration device, and mechanical stirring and lifting mechanism, which is green and environmentally friendly. not functioning properly.

Description of drawings

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a schematic structural diagram of an inverted A ² /O-GDMBR integrated village sewage treatment device with applied electric field according to an embodiment of the present invention.

Explanation of reference signs:

A-anoxic zone, B-anaerobic zone, C-aerobic zone, D-regulation zone, E-membrane filter zone;

1- check valve, 2- water inlet valve, 3- cathode electrode, 4- anode electrode, 5- first partition, 6- fender, 7- mechanical stirring lifting mechanism, 8- second partition, 9 -The first aeration component, 10-perforated mud discharge pipe, 11-adjustable angle baffle, 12-inclined deflector, 13-return channel, 14-return port, 15-water inlet, 16-arc guide Board, 17-inverted A ² /O box shell, 18-exhaust port, 19-controller, 20-solar power supply device, 21-air pump, 22-air valve, 23-gas flow meter, 24-connecting pipe , 25-return pump, 26-return pipe, 27-membrane assembly, 28-liquid flow meter, 29-exhaust assembly, 30-water outlet valve, 31-water collection tank, 32-overflow pipe, 33-vent valve, 34 - GDMBR box, 35 - second aeration assembly.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in Figure 1, an inverted A ² /O-GDMBR integrated village sewage treatment device with an external electric field, the device adds sewage to be treated in the device during sewage treatment, including an inverted A ² /O box shell 17, a cathode Electrode 3, anode electrode 4, mechanical stirring lifting mechanism 7, first aeration assembly 9, adjustable angle baffle 11, inclined deflector 12, arc deflector 16, GDMBR box 34, membrane module 27, the second Two aeration components 35, water collection tank 31, air pump 21, return pump 25 and solar power supply device 20, the inverted A ² /O box shell 17 is a sealed box shell, in a micro-pressure state, which can strengthen oxygen Solubility and the mass transfer efficiency of pollutants strengthen the removal efficiency of pollutants; the GDMBR box 34 is an open box at the top, and the air pump 21, the return pump 25 and the solar power supply device 20 are all arranged on the inverted A ² /O outside the box shell 17, the water collection tank 31 is arranged on the outside of the GDMBR box 34, the air pump 21, the anode electrode 4, the cathode electrode 3, the mechanical stirring lifting mechanism 7 and the return pump 25 are all powered by solar energy The power supply device 20 supplies power;

The inside of the inverted A ² /O box shell 17 ^is sequentially divided into anoxic zone A, anaerobic zone B and In the aerobic zone C, the upper end of the first partition 5 is arranged higher than the upper end of the second partition 8, the anoxic zone A communicates with the bottom of the anaerobic zone B, and the upper part of the anaerobic zone B is connected to the aerobic zone B. The oxygen zone C is connected, the upper part of the anoxic zone A is communicated with the external water inlet pipe through the water inlet 15, the cathode electrode 3 is set in the anoxic zone A, and the anode electrode 4 is set in the cathode electrode 3 , the mechanical stirring lifting mechanism 7 is set in the anaerobic zone B;

The first aeration assembly 9 is set in the aerobic zone C, the inclined deflector 12 is arranged at an angle of 30° with the horizontal direction, and the upper end of the inclined deflector 12 is in contact with the first separator 5 The upper end of the inclined deflector 12 is fixedly connected, the lower end of the inclined deflector 12 extends into the aerobic zone C and is connected with the upper end of the adjustable angle baffle 11, the upper end of the arc deflector is fixed on the top wall of the housing, and the lower end is a free end , the return channel 13 is formed between the inclined deflector 12, the adjustable angle baffle 11, the top wall of the housing and the arc deflector 16;

The inside of the GDMBR box 34 is divided into a conditioning area D and a membrane filtration area E by two partitions staggered in the GDMBR box 34, and the upper water outlet of the aerobic area C communicates with the upper part of the conditioning area D through a connecting pipe 24 , the bottom of the adjustment zone D communicates with the upper part of the anoxic zone A through the return pipe, the second aeration assembly 35 and the membrane assembly 27 are all arranged in the membrane filtration area E, and the second aeration assembly 35 is arranged in the membrane assembly 27, the water outlet pipe of the membrane module 27 communicates with the water collection tank 31, and the exhaust assembly 29 and the water outlet valve 30 are arranged on the water outlet pipe of the membrane module 27. The air inlet pipe of the first aeration assembly 9 and the second The air inlet pipes of the aeration module 35 are all connected to the air pump 21, and an air valve 22 is arranged on the air inlet pipe; the membrane module 27, namely GDMBR, adopts a submerged membrane module, which is a flat membrane or a hollow fiber membrane, and the material can be: acetic acid The working pressure of cellulose, cellulose acetate, polyethylene, polysulfone or polyamide is provided by the gravity head of water, about 5-100kPa, and the membrane module 27 is not provided with hydraulic cleaning and chemical cleaning devices, and continuous water (also It can run intermittently); the exhaust assembly 29 can be a manual exhaust valve or an exhaust valve for timing exhaust, and the exhaust valve can be opened manually (once every 8-12 hours) or automatically to remove the accumulated gas in the pipeline to ensure smooth water outlet;

When the first aeration component 9 aerates, part of the sludge and liquid in the aerobic zone C flows back to the anoxic zone A along the return channel 13, and the other part of the mixed liquid enters the adjustment zone D through the connecting pipe 24 after passing through the inclined fender , part of the sedimented sludge in the adjustment area D is returned to the upper part of the anoxic area A through the return pipe 26 and the return pump 25, and part of it is discharged regularly; the mixed solution pre-settled in the adjustment area D enters the membrane filtration area E, and is Driven by the driving force, the mixed liquid is filtered through the membrane module 27, and the effluent enters the water collection tank 31, and the second aeration module 35 aerates and scours the membrane module 27.

The shell 17 of the inverted A ² /O box is sealed and opened when the mechanical agitation lifting mechanism in the anaerobic zone B strengthens the push flow, and the first aeration component is installed at the bottom of the aerobic zone C to control the dissolved oxygen at 2-4mg/L At the same time, the aeration provides the driving force of the airflow; a second aeration component is installed at the bottom of the membrane filtration area E, and the program aerates to form microbubbles to oxygenate and flush the membrane components.

This application adopts the inverted A ² /O coupled GDMBR process, and through the research and development of a new configuration, it realizes three functions of one gas and three functions, that is, integrates three functions of aeration and oxygenation, nitrification liquid circulation and sludge return, saving energy consumption; building an external source of weak electricity Field-mediated, the negative and positive poles are built in a rotary structure, the outer cylinder is the cathode, and the anode is placed in the center of the cathode. The cylinder placement increases the contact area between microorganisms and electrodes, and increases the utilization efficiency of electrons, thereby promoting denitrification speed, Improve denitrification efficiency; microorganisms in low-voltage electric field have metabolic behavior, physiological functions, cell morphology and surface characteristics change, increase the diversity of microbial communities, change the properties of sludge mixture, thereby reducing membrane pollution; adopt gravity flow membrane filtration System (Gravity Driven Membrane system, GDM), the filtration head is much smaller than the filtration head required by traditional membrane filtration equipment, the pressure is only provided by the gravity of the water, and no pump is needed for suction, so the energy consumption is low during operation; no hydraulic reaction is required Flushing and chemical cleaning, so the operation is simple, and the operation and maintenance management is convenient.

The backflow channel 13 is connected to the backflow port 14 of the anoxic zone A, and the backflow port 14 is arranged directly opposite to the water inlet 15 of the inverted A ² /O box shell 17, and the flow rate of the backflow liquid and the disturbance of the air bubbles are used to quickly and evenly distribute the water inflow ; At the same time, the high concentration of organic matter in the influent can quickly consume the dissolved oxygen in the water and promote the rapid formation of an anaerobic environment.

Inclined fenders are provided at the bottom of the anoxic zone A, the bottom of the anaerobic zone B, the bottom of the aerobic zone C, the bottom of the regulating zone D and the bottom of the membrane filtration zone E. Specifically: an inclined fender 6 is respectively provided at the bottom of the anoxic area A and the bottom of the anaerobic area B, and the inclined fenders in the two areas are arranged facing each other; at the bottom of the aerobic area C, two A slanted fender facing to each other, and the fender at the bottom of the aerobic zone C is vertically arranged with the space of the fender in the anoxic zone A, and on the side wall of the aerobic zone C, there is a Fenders, for water flow to the GDMBR box 34, two inclined fenders are symmetrically arranged at the bottom of the adjustment area D, and two inclined fenders are symmetrically arranged at the bottom of the membrane filtration area E; the adjustment area D and the membrane filter The fender space in area E is arranged vertically; this arrangement prevents mud from accumulating at the dead corner of the device. When the device is running, the mud on the inclined fender slides down from the inclined plate and falls into anaerobic area B or aerobic area C , Regulating area D, and membrane filtration area E, slowly deposit and accumulate, and finally collect and discharge through the perforated mud discharge pipe.

The lower end of the inclined deflector 12 is hinged to the upper end of the adjustable angle baffle 11, and the circulation and reflux ratio is controlled by adjusting the opening and closing angle of the adjustable angle baffle 11; the fluid flow is changed by adjusting the opening and closing angle of the baffle. State and flow field, so as to change different circulating reflux ratios. Generally, the reflux ratio is controlled at a circulating reflux ratio of 0.5:1-3:1; in order to cope with the impact of changes in water quality, water quantity and temperature on denitrification, and maintain optimal operation state.

A water inlet valve 2 and a check valve 1 are respectively arranged on the external water inlet pipe, the connecting pipe 24 and the return pipe 26 , and a liquid flow meter 28 is also arranged on the water outlet pipe of the membrane module 27 . A gas flow meter 23 is also provided on the air intake pipe of the aeration assembly. An exhaust port 18 is provided on the top of the anoxic zone A, and the exhaust port is 30-200 cm higher than the pool top; an overflow pipe 32 is connected to the upper part of the GDMBR box body 34 . At the bottom of the aerobic zone C, the bottom of the conditioning zone D and the bottom of the membrane filtration zone E are respectively provided with a perforated mud discharge pipe 10, and a vent valve 33 is provided on each perforated mud discharge pipe 10; the perforated The mud discharge pipe 10 and the vent valve 33 are used to discharge the settled mud in the device.

The solar power supply device 20 is electrically connected to the controller 19, and the controller 19 is electrically connected to the cathode electrode 3 and the anode electrode 4; the electric energy is provided by the solar power supply device, and the electrode volume occupies the space of the anaerobic zone as much as possible, and the material of the cathode electrode adopts Carbon cloth, carbon felt or graphite plate carbon-based material and stainless steel mesh, nickel foam or titanium plate are non-precious metal materials; the anode electrode material is graphite carbon brush, graphite rod, graphite plate or carbon felt carbon-based material; the electrode adopts a rotary structure , the cylindrical shape formed by the cathode electrode keeps a fixed distance from the anode electrode; and the distance between the stainless steel mesh cathode and the graphite carbon brush anode is 0.3-10cm.

A sewage treatment method of an inverted A ² /O-GDMBR integrated village sewage treatment device with an external electric field, specifically comprising the following steps:

Initially, adjust the angle of the adjustable angle baffle 11, apply a low pressure of 0.1-5.0V to the cathode stainless steel mesh and the anode carbon brush in the anoxic zone, and the raw water to be treated enters the anoxic zone A of the device from the water inlet 15, After the flow passes through the low-voltage electric field formed by the cathode electrode 3 and the anode electrode 4, it enters the anaerobic zone B from the bottom of the first separator 5, and the anode electrode also functions as a gas-liquid-solid three-phase rapid separation, degassing quickly and reducing dissolution Oxygen, to promote the denitrification process, the gas is discharged from the exhaust port; then the mechanical agitation lifting mechanism 7 lifts the water from the top of the second partition 10 into the aerobic zone C, and the tiny air bubbles generated by the first aeration component 9 Oxygenation is carried out in the aerobic zone to provide microorganisms with sufficient dissolved oxygen concentration of 2-4mg/L, which promotes microbial nitrification and phosphorus absorption, and also provides power for the return flow of nitrification liquid and sludge; the gas passes through the arc deflector It is quickly discharged from the exhaust port to provide powerful hydraulic conditions for the reflux of the nitrifying liquid. Under the reflux power provided by the first aeration component 9 in the aerobic zone C, a part of the sludge and reflux liquid pass through the curved deflector 16 The diversion flows back to the anoxic zone A through the return channel 13; the other part of the mixed liquid enters the GDMBR box 34 through the connecting pipe 24 after passing through the large-angle inclined fender 6, and the large-angle inclined fender (with the horizontal line The included angle is 70°) can effectively prevent the sludge from floating up, achieve good sedimentation conditions, minimize the sludge entering the GDMBR tank with the effluent, ensure the stability of the sludge concentration in the inverted A ² /O tank and reduce subsequent membrane fouling; sedimentation in the adjustment area D Part of the sludge is returned to the upper part of the anoxic zone A through the return pipe 26 and the return pump 25, and the other part is discharged regularly; the mixed solution pre-sedimented in the adjustment zone D enters the membrane filtration zone E, and the second aeration module 35 is used for membrane filtration. The module 27 performs oxygenation and flushing, and the water entering the membrane filtration area E is filtered by the membrane module 27 and then enters the water collection tank 31 through the outlet pipe; the sludge reflux is carried out in the adjustment area D during normal operation, and is returned to the inverted A ² /O pool Anoxic zone A; when the mud discharge period (5-15d) is reached, the backflow is closed, the emptying pipe is opened, and the mud is discharged; the working pressure in the membrane filtration zone E is provided by the gravity head of water, which is 5-100kPa, The membrane module is not equipped with hydraulic cleaning and chemical cleaning devices, and the water is discharged continuously (intermittent operation is also possible);

During operation, the raw water to be treated and the reflux sludge settled in the conditioning zone D enter the anoxic zone A of the device from the water inlet 15, and the sludge and reflux liquid returned from the aerobic zone C through the reflux channel 13 pass through the cathode electrode 3 together. With the action of the low-voltage electric field formed by the anode electrode 4, the mixed water after the action of the low-voltage electric field enters the anaerobic zone B from the bottom of the first partition 5, and then is lifted by the mechanical stirring lifting mechanism 7 to lift the mixed water from the second partition The top of 8 is lifted into the aerobic zone C, and under the backflow force provided by the first aeration component 9, a part of the sludge and reflux liquid are returned to the anoxic zone A again through the backflow channel 13 to reconnect with the newly entered device to be treated The raw water of the water confluence; the other part of the mixed solution enters the GDMBR box 34 through the connecting pipe 24 through the large-angle inclined fender 6 again, and part of the sludge deposited in the adjustment area D is returned to the gap through the return pipe 26 and the return pump 25 again. The upper part of the oxygen zone A rejoins the raw water to be treated newly entering the device; the mixed solution pre-settled in the conditioning zone D is filtered through the membrane module 27 and then enters the water collection tank 31 through the outlet pipe; thus, the circulation backflow is finally completed. Sewage treatment: regularly manually (every 8-12 hours, can be 10 hours) or automatically open the exhaust valve to remove the gas accumulation in the pipeline, and keep the water out of the pipeline smooth;

During normal operation, when the mud discharge cycle is reached (once every 5-15 days, which can be once every 10 days), stop the aeration of the first aeration component 9 and the second aeration component 35 for 5-60 minutes, and open the perforated mud discharge The pipe 10 is used for mud discharge, and the device is restarted after the mud discharge is completed.

The quality of treated raw water is: COD: 200mg/L; ammonia nitrogen: 30±5mg/L; TP: 4±0.5mg/L; pH 7.0-7.5.

The quality of the effluent treated by the sewage treatment device of this application is: COD: 20.02±3.95mg/L; ammonia nitrogen: 4.3±0.5mg/L; TP: 0.32±0.05mg/L; the device of this application removes organic matter and denitrification The phosphorus removal effect is good, and the effluent water quality meets the first-class A standard in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants". At the same time, it can remove pathogenic bacteria and has a good ability to resist shock loads.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

An inverted A ² /O-GDMBR integrated village and town sewage treatment device with applied electric field, characterized in that it includes an inverted A ² /O box shell (17), cathode electrode (3), anode electrode (4), mechanical stirring Lifting mechanism (7), first aeration assembly (9), adjustable angle baffle (11), inclined deflector (12), arc deflector (16), GDMBR box (34), membrane module (27), second aeration assembly (35), water collection tank (31), air pump (21), return pump (25) and solar power supply device (20), described inverted A ² /O box shell ( 17) is a sealed box shell, the GDMBR box (34) is an open box at the top, and the air pump (21), the return pump (25) and the solar power supply device (20) are all arranged in an inverted A ² /O the outside of the box shell (17), the water collection tank (31) is arranged on the outside of the GDMBR box (34), the air pump (21), the anode electrode (4), the cathode electrode (3) , the mechanical stirring lifting mechanism (7) and the return pump (25) are powered by the solar power supply device (20); The inside of the inverted A ² /O box shell (17) is sequentially ^divided into hypoxic Zone (A), anaerobic zone (B) and aerobic zone (C), the upper end of the first partition (5) is arranged higher than the upper end of the second partition (8), and the anoxic zone ( A) communicates with the bottom of the anaerobic zone (B), the upper part of the anaerobic zone (B) communicates with the aerobic zone (C), and the upper part of the anoxic zone (A) communicates with the outside through the water inlet (15) The water pipeline is connected, the cathode electrode (3) is arranged in the anoxic zone (A), the anode electrode (4) is arranged in the cathode electrode (3), and the mechanical stirring lifting mechanism (7) is arranged in the anaerobic zone (B); The first aeration assembly (9) is arranged in the aerobic zone (C), the upper end of the inclined deflector (12) is fixedly connected with the upper end of the first partition (5), and the inclined deflector ( The lower end of 12) extends into the aerobic zone (C) and is connected with the upper end of the adjustable angle baffle (11). A return channel (13) is formed between the deflector (12), the adjustable angle baffle (11), the top wall of the casing and the curved deflector (16); The interior of the GDMBR box (34) is divided into a conditioning area (D) and a membrane filtration area (E) by two partitions staggered in the GDMBR box (34), and the upper water outlet of the aerobic area (C) passes through The connecting pipe (24) is communicated with the top of the adjustment area (D), and the bottom of the adjustment area (D) is communicated with the top of the anoxic area (A) through a return pipe, and the second aeration assembly (35) and the membrane assembly ( 27) are all arranged in the membrane filtration area (E), and the second aeration module (35) is arranged below the membrane module (27), and the outlet pipe of the membrane module (27) is connected to the water collection tank (31), and the membrane module The outlet pipe of (27) is provided with an exhaust assembly (29) and a water outlet valve (30), and the air inlet pipe of the first aeration assembly (9) and the air inlet pipe of the second aeration assembly (35) All are connected with the air pump (21), and an air valve (22) is provided on the air intake pipe; When the first aeration component (9) aerates, part of the sludge and liquid in the aerobic zone (C) flows back to the anoxic zone (A) along the return channel (13), and the other part of the mixed solution passes through the inclined fender The connecting pipe (24) enters the adjustment area (D), and the settled sludge in the adjustment area (D) is partially returned to the upper part of the anoxic area (A) through the return pipe (26) and the return pump (25), and part of it is regularly Discharge; the mixed solution pre-settled in the conditioning area (D) enters the membrane filtration area (E), driven by gravity, the mixed solution is filtered through the membrane module (27), and the effluent enters the water collection tank (31), and the second aeration The module (35) aerates and scours the membrane module (27). An inverted A ² /O-GDMBR integrated village and town sewage treatment device with an applied electric field according to claim 1, characterized in that: the backflow channel (13) is connected to the backflow port (14) of the anoxic zone (A), and the backflow The port (14) is arranged opposite to the water inlet (15) of the inverted A ² /O box shell (17); an exhaust port (18) is provided on the top of the anoxic zone (A), and the exhaust port is higher than the pool Top 30-200cm. An inverted A ² /O-GDMBR integrated village sewage treatment device with an external electric field according to claim 1, characterized in that: at the bottom of the anoxic zone (A), the bottom of the anaerobic zone (B), and The bottom of the oxygen zone (C), the bottom of the conditioning zone (D) and the bottom of the membrane filtration zone (E) are all provided with inclined fenders. An inverted A ² /O-GDMBR integrated village and town sewage treatment device with an applied electric field according to claim 1, characterized in that: the lower end of the inclined deflector (12) and the adjustable angle baffle (11) The upper end is hinged, and the circulating reflux ratio is controlled by adjusting the opening and closing angle of the adjustable angle baffle (11). An inverted A ² /O-GDMBR integrated village sewage treatment device with an applied electric field according to claim 1, characterized in that: the distance between the cathode electrode (3) and the anode electrode (4) is 0.3- 10cm; the cathode electrode material is made of carbon cloth, carbon felt or graphite plate carbon-based material and stainless steel mesh, nickel foam or titanium plate non-precious metal material; the anode electrode material is made of graphite carbon brush, graphite rod, graphite plate or carbon felt carbon-based material ; The electrode adopts a rotary structure, and the cylindrical shape formed by the cathode electrode maintains a fixed distance from the anode electrode. An inverted A ² /O-GDMBR integrated village and town sewage treatment device with an applied electric field according to claim 1, characterized in that: the solar power supply device (20) is electrically connected to the controller (19), and the control The device (19) is electrically connected with the cathode electrode (3) and the anode electrode (4), and the applied voltage is controlled at 0.1-5.0V. An inverted A ² /O-GDMBR integrated village sewage treatment device with an external electric field according to claim 1, characterized in that: the inverted A ² /O box shell (17) is sealed, and in the anaerobic zone (B) The mechanical stirring and lifting mechanism is opened when the push flow is strengthened, and the first aeration component is installed at the bottom of the aerobic area (C), which controls the dissolved oxygen at 2-4 mg/L and aerates to provide airflow driving force; in the membrane filtration area ( E) There is a second aeration component at the bottom for programmed aeration to form microbubbles to oxygenate and flush the membrane components. An inverted A ² /O-GDMBR integrated village sewage treatment device with an applied electric field according to claim 1, characterized in that: at the bottom of the aerobic zone (C), the bottom of the conditioning zone (D) and the membrane filter The bottom of the zone (E) is provided with a perforated mud discharge pipe (10) respectively, and a vent valve (33) is all provided on each perforated mud discharge pipe (10); the perforated mud discharge pipe (10) and the vent The valve (33) is used to discharge the settled mud in the device; part of the sludge in the conditioning zone (D) is periodically returned to the anoxic zone (A). According to claim 1, an inverted A ² /O-GDMBR integrated village sewage treatment device with external electric field is characterized in that: GDMBR adopts submerged membrane modules, which can be flat membranes or hollow fiber membranes; the material can be: Cellulose acetate, cellulose acetate, polyethylene, polysulfone or polyamide; the membrane module is driven by low-pressure gravity flow, the working pressure is 5-100KPa, there is no hydraulic cleaning and chemical cleaning device, and the water is discharged continuously. The sewage treatment method of an inverted A ² /O-GDMBR integrated village and town sewage treatment device with an applied electric field according to any one of claims 1-9, characterized in that it specifically comprises the following steps: At the beginning, the raw water to be treated enters the anoxic zone (A) of the device from the water inlet (15), flows through the low-voltage electric field formed by the cathode electrode (3) and the anode electrode (4), and is passed by the first separator (5) The bottom enters the anaerobic zone (B), and then is lifted by the mechanical agitation lifting mechanism (7) to lift the water from the top of the second partition (8) into the aerobic zone (C). Under the reflux power provided by an aeration component (9), a part of the sludge and reflux liquid are diverted through the curved deflector (16) and returned to the anoxic zone (A) from the reflux channel (13); the other part of the mixed liquid After entering the GDMBR box (34) through the large-angle inclined fender (6), the connecting pipe (24) enters the GDMBR box (34), and the sludge settled in the adjustment area (D) is returned through the return pipe (26) and the return pump (25) To the top of the anoxic zone (A), the other part is discharged regularly; the mixed solution pre-sedimented in the conditioning zone (D) enters the membrane filtration zone (E), and the second aeration component (35) carries out the process on the membrane component (27). Oxygenation and flushing, the water entering the membrane filtration area (E) enters the water collection tank (31) from the outlet pipe after being filtered by the membrane module (27); During operation, the raw water to be treated and the return sludge deposited in the conditioning area (D) enter the anoxic area (A) of the device from the water inlet (15) and return from the aerobic area (C) through the return channel (13). The sludge and the reflux liquid pass through the low-voltage electric field formed by the cathode electrode (3) and the anode electrode (4), and the mixed water after the low-voltage electric field enters the anaerobic zone (B) from the bottom of the first separator (5) , and then lift the mixed water from the top of the second partition (8) into the aerobic zone (C) through the mechanical agitation lifting mechanism (7), under the backflow power provided by the first aeration component (9), so that Part of the sludge and return liquid flows back through the return channel (13) to the anoxic zone (A) and rejoins the raw water to be treated newly entering the device; the other part of the sludge and return liquid passes through the large-angle inclined fender again (6) After entering the GDMBR box (34) by the connecting pipe (24), the sludge deposited in the conditioning area (D) is returned to the anoxic area (A) through the return pipe (26) and the return pump (25) again. The upper part rejoins the raw water to be treated newly entering the device; the mixed solution pre-settled in the conditioning area (D) is filtered through the membrane module (27) and enters the water collection tank (31) from the outlet pipe; thus, the circulation returns to the final Complete the treatment of sewage; During normal operation, when the sludge discharge cycle is reached, stop the aeration of the first aeration assembly (9) and the second aeration assembly (35) for 5-60 minutes, open the perforated sludge discharge pipe (10) to discharge sludge, discharge The unit is restarted after the mud is complete.

Images