CN111204866A

CN111204866A - Domestic sewage treatment upgrading process and device

Info

Publication number: CN111204866A
Application number: CN202010104263.2A
Authority: CN
Inventors: 高根树
Original assignee: Guangxi Guangyu Water Resources Technology Development Co ltd
Current assignee: Guangxi Guangyu Water Resources Technology Development Co ltd
Priority date: 2020-02-18
Filing date: 2020-02-18
Publication date: 2020-05-29

Abstract

The invention provides a domestic sewage treatment upgrading process and device, belongs to the field of sewage treatment, and mainly solves the problems that an existing sewage treatment process is too high in ammonia nitrogen discharge index, too low in anaerobic stirring efficiency and high in MBR cost. The stirring of the fluid is carried out by swinging a flexible pipe to form a cooking state, so that the stirring efficiency is greatly improved, and the anoxic nitrification is accelerated; sintered metal microporous filtration is added at the rear end of the aerobic treatment, so that the problems of membrane replacement, chemical cleaning and the like are solved; carrying out near long-term filter pressing on the residual sludge; the system has the capability of realizing technical support for upgrading and transforming the existing sewage treatment plants and rural sewage treatment facilities, the integrated equipment is compact, and the investment and operation cost is obviously reduced. The invention is used for sewage treatment.

Description

Domestic sewage treatment upgrading process and device

Technical Field

The invention relates to a domestic sewage treatment process technology and a device, in particular to a domestic sewage treatment upgrading process and a device applying the process.

Background

With the stricter environmental protection policy in China, the requirement on the quality of river (lake) water environment is improved, the discharge standards of urban sewage plants and rural domestic sewage treatment facilities are continuously improved, the increasingly strict requirements on effluent quality indexes are met, and a lot of areas continue to produce effluent close to surface water IV type sewage plants.

Water quality COD and BOD of inlet water of sewage treatment facilities in urban sewage plant and rural area₅The concentration is generally low, the concentration of ammonia nitrogen and total nitrogen is relatively high, and the insufficient denitrification rate increasingly becomes the process bottleneck of sewage treatment, particularly rural sewage treatment.

The sewage denitrification is mainly performed in an anaerobic/anoxic tank, and anaerobic ammonia oxidation is increasingly becoming a breakthrough point of denitrification processes, such as Chinese patent 'an urban sewage treatment upgrading and modifying process based on anaerobic ammonia oxidation' (publication No. CN 110436704A). The stirring technology of anaerobic ammoxidation has not been broken through for a long time.

Secondly, for the effluent turbidity reaching the standard, the MBR membrane bioreactor is used to realize filtration. Backwashing and chemical cleaning of the MBR membrane, and 3-5 years of membrane life, the replacement cost is high, and the MBR membrane is often the root cause of high operation and maintenance cost.

Thirdly, the treatment of the sludge in the secondary sedimentation tank generally faces complicated procedures such as large-area sludge spreading and collection (large-scale sludge scraper), sludge concentration (concentration tank), sludge pressure filtration or centrifugation, the total amount of the sludge is very small, the treatment line is very long, and the matched facilities and equipment are very large.

After decades of development, domestic sewage treatment tends to be formulaic, and the process technology is lack of efficient and low-cost support under the requirement of high emission standards.

Disclosure of Invention

The invention aims to provide a domestic sewage treatment process and complete equipment which are economical, practical, efficient and small in occupied area.

In order to achieve the aim, the invention provides a domestic sewage treatment upgrading process, which is used for sewage treatment, and the process system sequentially comprises a regulating tank, a lifting pump, an anaerobic/anoxic tank, an aeration tank with an aeration system and a sludge reflux pump, and is characterized in that:

the sewage is lifted to the anaerobic/anoxic tank by the lifting pump.

Intermittently stirring the sewage in the anaerobic/anoxic tank.

The slurry after the anaerobic biochemical reaction enters an aeration tank, and aerobic biochemical reaction is carried out under the oxygen supply of an aeration system.

After aeration, the sewage is pumped by a pump from the metal microporous filter to obtain filtrate, or is conveyed by a pump to the metal microporous filter to obtain pressure digestion turbid liquid, and the filtered waste water is discharged out.

And closing the reclaimed water output valve A, reversely conveying fluid to the metal microporous filter through the valve B by a bypass connected with an independent pump or a pump in the system, realizing filter hole backwashing regeneration, synchronously enabling a mud membrane coated on the surface of the filter element to fall off, and sinking to form sludge concentration. The backwash fluid is either water or gas.

And after the regeneration of the filter holes is finished, closing the filter hole regeneration fluid pipeline valve B, opening the reclaimed water output valve A again, and entering a normal flow.

The reflux pump sucks sludge from a sludge concentration area and conveys aged sludge slurry to the anaerobic/anoxic tank for reflux.

And another pipeline is opened behind the reflux pump and communicated with the pressure filter through a valve C. Opening a valve C according to a set time interval, collecting slurry by the filter press, closing an incoming path valve C after the bin is full, carrying out filter pressing on slurry in the filter press by using air pressure or repeatedly collecting slurry for multiple times until slurry cakes are formed in an accumulated mode, discharging the air pressure and discharging the slurry cakes. The excess sludge is treated in batches according to the sequence.

Further preferably, the filter press is a vertical single-bin filter press tank with an inner interlayer formed by metal microporous filter membranes, and the tank bottom is discharged by a valve.

The intermittent stirring of the sewage in the anaerobic/anoxic tank is realized by the following method:

a swinging fluid stirring device is arranged in the anaerobic/anoxic tank. The pendulum fluid stirring device comprises a group of flexible pipes submerged into the slurry, and a pipe head is connected with a pendulum bob with certain mass.

The oscillating fluid stirring device receives the pressurized slurry from the reflux pump. The slurry passes through the flexible pipe, the pressure fluctuation is inherent, the combination with the irregular bending of the flexible pipe pushes the pipeline to shake and swing, and the slurry outlet of the flexible pipe randomly jumps in a certain area under the limitation of the swing of the pendulum bob, so that the sludge slurry is distributed to the predetermined area of the reactor, and the slurry in the reactor is pushed to be disturbed and flow upwards.

And controlling the operation of the reflux pump by a program, stopping stirring after the oscillating fluid stirring device continuously stirs for a certain time, and repeatedly starting the reflux pump after the serous fluid in the anaerobic/anoxic tank is calmed for a certain time to enter the next stirring cycle.

Alternatively, the first and second electrodes may be,

a planetary stirring device is arranged in the anaerobic/anoxic tank.

The planet stirring device comprises a transmission device, at least 2 end discs, a radiation arm plate, a double-end hanging arm plate, a fixed star blade paddle and a movable star blade paddle.

The transmission device is fixed on the top cover of the anaerobic/anoxic tank. The chain is connected with the driving gear and the driven gear. The driven gear is connected to the central shaft through a key. The end disc is strung on the central shaft.

The fixed star blade paddle is formed by radially arranging and welding plates with a certain amount of holes or grooves or seams, two ends of the fixed star blade paddle are connected with 2 shaft heads in an inserting welding or bolting mode and fixed on a certain radius of the end plate to form a cage-shaped frame.

The end disc is a circular plate, the middle of the end disc is provided with a shaft hole, the periphery of the end disc is also provided with uniform distribution holes, and at least 2 pieces of the end disc are strung on the central shaft. The periphery of the end disc radially extends out of the radial arm plate. One end of the radiation arm plate is fixed on the end disc through a bolt, and one end of the radiation arm plate orthogonally extends out of a shaft shoulder. The end disc and the radiation arm plate can be combined into a whole.

The movable star blade paddle is formed by radially arranging and welding plates provided with a certain amount of holes or grooves or seams, two ends of the movable star blade paddle are connected with 2 shaft heads in an inserting welding or bolting mode, and the length of the movable star blade paddle is slightly larger than that of the fixed star blade paddle.

The double-end wall hanging plate is provided with holes at two ends, one end is hung on the shaft shoulder of the radiation wall hanging plate, a shaft sleeve or a bearing is arranged between the two ends for transition, and the other end is hung on the movable star blade paddle in a pivot mode.

And controlling the operation of the planetary stirring device by a program, stopping stirring after the planetary stirring device continuously stirs for a certain time, and repeatedly starting the planetary stirring device after the slurry in the anaerobic/anoxic tank is calmed for a certain time to enter the next stirring cycle.

The utility model provides a mark device is carried in domestic sewage treatment for domestic sewage treatment, including equalizing basin, elevator pump, area stirring anaerobism/oxygen deficiency pond, good oxygen pond, roots's fan, well water pump, backwash pump, its characterized in that:

a filtering tank is arranged behind the aerobic tank, and a sludge reflux pump extracts sludge from the filtering tank and conveys the sludge to the anaerobic/anoxic tank. The filter tank is internally embedded with a metal microporous filter, the lower part of the filter is opened to receive slurry, the slurry passes through the vertical metal microporous filter element group and enters the overflow area, at least one joint is led out from the overflow area at the upper part of the filter, and the slurry passes through the filter tank after being sealed and is connected with a reclaimed water pump through a valve A.

An aeration head and biological filler are arranged in the aerobic tank, and an aeration pipeline is communicated with the Roots blower.

The aeration pipeline is provided with a bypass and is communicated with the filter overflow cavity through a valve B.

And a pipeline behind the reflux pump is provided with a bypass and is communicated with the pressure filter through a valve C.

Or in addition to that, the system may further include,

the anaerobic/anoxic tank with stirring function, the aerobic tank and the filter tank are sequentially separated and connected into a box body, the metal microporous filter is embedded into the filter tank, and the filter press is integrated outside the box body.

Or still further in that,

the anaerobic/anoxic tank, the aerobic tank, the filter tank and the equipment room are sequentially connected into a box body in a separating way, the metal microporous filter is embedded into the filter tank, and the Roots blower, the reflux pump, the reclaimed water pump, the electrical cabinet and the control cabinet are all integrated in the equipment room. The filter press is integrated outside the box body.

The stirring device arranged in the anaerobic/anoxic tank is a pendulum fluid stirrer.

The pendulum fluid stirrer comprises at least one inlet joint, a set of pipelines for distributing fluid, a plurality of orthogonal interfaces and a flat cloth pipe, wherein the pipelines are fixedly hung on the upper cover of the anaerobic/anoxic tank, the orthogonal interfaces are arranged in a radial or annular or rectangular array mode and have the same direction, one end of the flat cloth pipe is blind, a set of vertical pipes are respectively communicated with the orthogonal interfaces of the flat cloth pipe through a loose joint or a pivot mechanism, a pendulum with certain mass is hung at the lower end of each vertical pipe, the vertical pipes are properly pulled and dropped into the anaerobic/anoxic tank to a certain distance from the bottom, and meanwhile, the free swing range of the lower end of each vertical pipe is limited. The vertical pipe is either a hard pipe or a flexible pipe. The movable joint is a quick-connection joint, or a rotatable quick-connection joint, or a quick-connection joint, preferably a rotatable quick-connection joint.

The pendulum is bolted or screwed or cabled with the vertical pipe, and preferably, the pendulum is provided with a pipe thread through hole and is connected with the flexible pipe through a quick connector.

Alternatively, the first and second electrodes may be,

the stirring device arranged in the anaerobic/anoxic tank is a planetary stirrer.

The planetary mixer comprises a transmission device, an end disc, a radiation arm plate, a double-end hanging arm plate, a fixed star blade paddle and a movable star blade paddle.

The transmission device comprises a motor speed reducer, a driving gear, a chain, a driven gear, a base, a suspension arm, a bearing seat and a central shaft. And two ends of the central shaft are provided with shaft shoulders connected with bearing seats, and the bearing seats are hung by the suspension arms and fixed on the base. The motor reducer is also fixed on the base. The chain is connected with the driving gear and the driven gear. The driven gear is connected to the central shaft through a key.

The fixed star blade paddle is formed by radially arranging and welding plates provided with a certain amount of holes or grooves or seams, and two ends of the fixed star blade paddle are connected with 2 shaft heads in an inserting welding or bolting mode.

At least 2 fixed star blade thick liquid group bolts are fixed in the end plate periphery, form cage frame.

Drawings

FIG. 1 is a flow chart of a domestic sewage treatment and upgrading process using pendulum fluid stirring according to the present invention.

FIG. 2 is a flow chart of a domestic sewage treatment and upgrading process with planetary stirring according to the invention.

Fig. 3 is a schematic diagram of the general structure of an integrated pendulum-jet fluid stirring domestic sewage treatment and upgrading device according to the invention.

FIG. 4 is a schematic diagram of a filter structure in a filtering tank of an integrated domestic sewage treatment and upgrading device according to the invention.

FIG. 5 is a schematic top view of a domestic sewage treatment apparatus with an integrated pendulum-jet fluid stirring according to the present invention.

FIG. 6 is a schematic diagram of the equipment layout of the domestic sewage treatment and upgrading device equipment room with integrated pendulum fluid stirring according to the invention.

FIG. 7 is a schematic view of a filtration tank of an integrated pendulum-jet fluid stirring domestic sewage treatment upgrading device according to the present invention.

FIG. 8 is a schematic diagram of the general structure of an integrated planetary stirring domestic sewage treatment and upgrading device according to the invention.

FIG. 9 is a schematic structural view of an integrated planetary mixer of an anoxic tank for domestic sewage treatment and upgrading device according to the invention.

Description of the reference numerals

100a 1-pendulum fluid stirring device:

101a 1-hose, 102a 1-pendulum;

100-planetary mixer:

101-motor reducer, 102-driving gear, 103-chain, 104-base, 105-fixed star blade, 106-double-head hanging arm plate, 107-movable star blade, 108-hanging arm, 109-central shaft, 110-bearing seat, 111-driven gear, 112-end disc and 113-radial arm plate;

200-an aerobic tank;

300-a filtering tank:

301-air inlet interface, 302-intermediate water overflow outlet, 303-overflow cavity, 304-nut, 305-guide cylinder, 306-filter element;

400-filter-press tank:

401-compressed air inlet, 402-tank shell, 403-jacket, 404-filter disc, 405-filtrate outlet;

500-reflux pump;

600-a reclaimed water pump;

700-roots blower.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and are not to be construed as limiting the present invention.

The first embodiment is as follows:

the domestic sewage treatment upgrading process according to an embodiment of the present invention is described below with reference to the accompanying drawings, as shown in fig. 1.

The process comprises a regulating tank, a lift pump, an anaerobic/anoxic tank, a swinging fluid stirring device, an aeration tank, an aeration system, a filter tank, a sintered metal microporous filter element filter and a sludge filter-pressing tank. The filter outputs medium water. The compressed air from the Roots blower intermittently backflushes a mud film on the surface of the filter element through valve control, the mud is concentrated at the bottom of the filter tank, and then is conveyed to the inlet of the random swinging fluid stirrer through the reflux pump and is submerged to a certain depth to form fluid stirring. The reflux pump is stopped when the stirring is continued for a period of time, and the stirring is carried out again at certain intervals.

The sludge is intermittently conveyed to the sludge filter-pressing tank through valve control, the valve is closed, compressed air is used for switching on, the slurry in the filter-pressing tank is compressed, and the slurry is repeatedly received and compressed until a mud cake is formed.

The technical principle of the process is as follows:

1) the treatment capacity of anaerobic fermentation is enhanced by random pendulum fluid stirring, and particularly anaerobic ammonia oxidation is promoted.

2) The turbidity of the reclaimed water outlet is reduced by sintering the metal microporous filter element filter. The rigidity, durability and corrosion resistance of the micropore pores of the metal micropore filter element are utilized, the investment and maintenance cost of the membrane is reduced, the side effect of chemical cleaning is eliminated, and the service life of the membrane is greatly prolonged.

3) The characteristics of low sludge yield and small sludge discharge amount are utilized, and a small filter-pressing tank is adopted to compress a sludge cake, so that the filter-pressing effect is changed by time.

Example two:

another domestic sewage treatment upgrading process according to an embodiment of the present invention is described below with reference to the accompanying drawings. As shown in fig. 2.

Different from the second embodiment, the return pump conveys the sludge into the anoxic tank, and the planetary stirrer stirs the slurry in the anaerobic/anoxic tank.

Example three:

a domestic sewage treatment upgrading device according to an embodiment of the present invention is described with reference to the accompanying drawings. As shown in fig. 3, 4, 5, 6, 7.

The device integrates an anoxic tank, a swinging fluid stirring device, an aeration tank, an aeration system, a filter tank, a sintered metal microporous filter element filter, a sludge filter-pressing tank, an electrical cabinet and a control cabinet.

A set of swinging fluid stirring device 100A1 is arranged on the upper cover of the anoxic tank, and is movably connected with a group of hoses 101A1 which go deep into the bottom of the tank through a pipeline arrangement and are connected with a swinging hammer 102A 1.

A set of filters 300 is embedded and fixed in the filter tank. The upper part of the filter tank is provided with an air inlet 301 communicated with the Roots blower 700, the side wall of the upper part is provided with a reclaimed water overflow port 302, and the reclaimed water overflow port is fixed on the end wall of the filter tank by a pipe thread pair and a plastic gasket. The upper part of the filter 300 is a closed overflow cavity 303, the lower part is an open guide cylinder 305, the inside is a group of metal microporous filter elements 306, and the filter elements are sealed and fixed on the bottom plate of the overflow cavity 303 through nuts 304. The filter 300 has lugs on both sides for bolting to the wall of the filter tank.

The overflow chamber 303 of the filter 300 is divided into two chambers, each chamber is provided with corresponding air inlet and reclaimed water output pipelines and is provided with an electromagnetic valve which is communicated with a Roots blower to carry out staggered operation to carry out back flushing on the filter element 306.

The sludge reflux pump 500 is connected with the pressure filter 400 through a controllable valve. The filter press 400 is provided with a compressed air inlet 401, a tank shell 402 with flanges at the upper part and the lower part, a pyramid jacket 403 is arranged in the shell, a group of metal microporous filter discs 404 with different sizes are welded on the pyramid jacket 403, and a filtrate outlet 405 is communicated with the interlayer.

The equipment room is opened with a door, and the reflux pump 500, the reclaimed water pump 600, the Roots blower 700, the electrical cabinet and the control cabinet are installed and fixed.

The working principle of the device is as follows:

1) principle of anoxic reaction

The slurry of the reflux pump 500 enters the four-way pipe joint of the oscillating fluid stirring device 100A1, is distributed on each laying pipe, and is injected into each hose 101A1 under pressure. Due to the fluctuation of the pressure source, the vector impact of the pressure flow and the asymmetry of the outlet of the hose 101A1, the hose 101A1 vibrates and swings, the swinging is limited by the pendulum 102A1, and the moving range is limited to a certain area. The twisting torque generated in the swinging process of the hose is transmitted to the rotatable quick-connection plug above the liquid level of the upper slurry, and then the quick-connection plug spontaneously rotates to digest the twisting torque of the hose.

The swinging and serial jumping of the hose form disturbance on the vertical surface of the slurry in the field; the random oscillation of the hose outlet spreads the point of entry of the foreign fluid into a zone, causing the slurry in the zone to be turbulently staggered, which is a vortical, slowly staggered upflow. If the gas outside the fluid is injected, the injected gas quickly blows out large bubbles to flow upwards and pass through along the way, and the cooking state turbulent mixing is formed. The fine particles and biological bacteria in the slurry are difficult to settle, and a good suspension state is maintained.

In the cooking state, the new fluid and the old fluid are quickly and fully inoculated, the organic matters and the anaerobic microorganisms are uniformly mixed, and the oil content is dispersed and difficult to aggregate and float. The more sufficient the stirring is, the shorter the duration is, the longer the calm time interval can be left to allow anaerobic microorganisms to decompose organic matters, ammonia nitrogen and oil fed to the mouth.

2) Working principle of filter

The aperture of the metal microporous filter element can be as small as 0.47 micron, and the filtering pressure is as low as 2kg/cm²The water outlet capacity is very strong. By grouping the filter elements, the valves of the air inlet pipeline and the overflow pipeline are opened in a staggered way, and the filter elements can be alternately openedThe filter element performs back flushing, so that the whole operation of the filter is stable.

3) Working principle of filter press

The metal microporous filter disc has the same filtering performance as a filter element, and is embedded on the interlayer by utilizing the weldability, so that a filtering channel is fully provided, and the surface is kept smooth to facilitate discharging. The solid content of the mud is low, so the mud cake can be discharged after the mud cake is accumulated and pressed for many times.

Example four:

referring to the drawings, another integrated domestic sewage treatment upgrading device according to an embodiment of the invention is described, and fig. 8 and 9 show the same.

In contrast to the third embodiment, a planetary mixer 100 is disposed in the anoxic tank, and a reflux pump 500 transfers sludge into the anoxic tank, and the planetary mixer stirs slurry in the anaerobic/anoxic tank.

The planetary mixer 100 is composed of a transmission device, an end disc 112, a radiation arm plate 113, a double-head hanging arm plate 106, a fixed star blade paddle 105 and a movable star blade paddle 107.

The transmission device includes a motor reducer 101, a drive gear 102, a chain 103, a driven gear 111, a center shaft 109, a base 104, a pair of suspension arms 108, and a pair of bearing blocks 110.

The fixed star blade paddle 105 and the movable star blade paddle 107 are both comb-shaped openings. The 12 fixed star blade paddles 105 are divided into two groups, are connected with four end discs 112, are connected in series with a central shaft 109, and are driven by a driven gear 111 in the center.

6 radial arm plates 113 are respectively extended from the end disc 112, and a double-end hanging arm plate 106 is hung, and 6 movable star blade paddles 107 are hung on the double-end hanging arm plate in a pairwise opposite mode.

The base 104 fixes the motor reducer 1001 and the suspension arm 108, and is connected with the upper cover of the anoxic tank.

It should be noted that:

1) the reflux pump may be a submersible sewage pump installed in the filtration tank.

2) The filtering tank can be separated from the aerobic tank, and the reclaimed water pump can be arranged in front of the filter. The filter is now in a closed configuration.

3) The control valve arranged on the pipeline is an electric valve or a pneumatic valve. And automation is realized through program control.

Advantageous effects

Compared with the prior art, the domestic sewage treatment upgrading process and device have the following beneficial effects:

1) the domestic sewage treatment upgrading process adopts fluid stirring in an anaerobic section, the homogenization level in the anaerobic process is greatly improved, and under the conditions of sewage environment temperature fluctuation and low organic matter content, organic matters can be transferred to the mouth side of hungry microorganisms to the maximum extent, the survival rate of the microorganisms is maintained, so that the lean organic matters and trace components can be removed efficiently, and the ammonia nitrogen treatment and phosphorus removal capability of the whole process is greatly improved.

2) The domestic sewage treatment upgrading process adopts high-efficiency stirring to eliminate the chance of floating oil on the surface of sewage, so that oil can penetrate into the sewage to widely contact microorganisms, and the oil degrading capability of the system is greatly improved.

3) The domestic sewage treatment upgrading process of the invention adds a sintered metal microporous filter element for filtration after the aerobic section. The sintered metal microporous filter element can provide the following advantages for the process compared with an MBR membrane:

◆ the filtration pore size is already as small as 0.5 microns and the filtration capacity is already very close to the conventional MBR membrane pore size order;

◆ the engineering operation pressure is as low as 0.2 MPa;

◆ the water yield per unit pressure far exceeds that of MBR membranes;

◆ the investment cost of the relative film can be reduced by more than 60%;

◆ eliminates the need for chemical cleaning of the filter membrane, avoiding the risk and cost of management of users in exchange for hazardous chemicals;

◆ the service life can reach more than decades, and the total operation cost is reduced by more than 90%.

4) The invention adopts a filter press to treat sludge nearby and output sludge cakes. The secondary slurry conveying of the traditional process is omitted, and a slurry tank for evaporation is omitted for small-sized sewage treatment projects.

5) The process system solves the technical support problem of sewage treatment upgrading transformation, especially the standard-reaching discharge of ammonia nitrogen in rural domestic sewage treatment.

Claims

1. The utility model provides a standard technology is carried in domestic sewage treatment for sewage treatment, this process systems include equalizing basin, elevator pump, anaerobism/oxygen deficiency pond, have aeration tank, the sludge reflux pump of aeration system in proper order, its characterized in that:

the sewage is lifted to an anaerobic/anoxic tank by a lifting pump;

intermittently stirring the sewage in the anaerobic/anoxic tank;

the slurry after the anaerobic biochemical reaction enters an aeration tank, and aerobic biochemical reaction is carried out under the oxygen supply of an aeration system;

after aeration, pumping filtrate from the metal microporous filter through a pump, or conveying pressure digestion turbid liquid to the metal microporous filter through the pump, and discharging reclaimed water after filtration;

closing the reclaimed water output valve A, reversely conveying fluid to the metal microporous filter through the valve B by an independent pump or a bypass connected with a pump in the system, realizing filter hole backwashing regeneration, synchronously leading a mud membrane coated on the surface of the filter element to fall off, and sinking to form sludge concentration; the backwash fluid is either water or gas;

after the regeneration of the filter holes is finished, closing a filter hole regeneration fluid pipeline valve B, opening a reclaimed water output valve A again, and entering a normal flow;

the reflux pump sucks sludge from a sludge concentration area and conveys aged sludge slurry to the anaerobic/anoxic tank for reflux;

another pipeline is opened behind the reflux pump and communicated with the pressure filter through a valve C; opening a valve C according to a set time interval, allowing the filter press to receive slurry, closing an incoming path valve C after the bin is full, performing pressure filtration on slurry in the filter press by using air pressure, or repeatedly allowing slurry to be received for multiple times until slurry cakes are accumulated, discharging the air pressure, and discharging the slurry cakes; treating the excess sludge in batches according to the sequence;

further preferably, the filter press is a vertical single-bin filter press tank with an inner interlayer formed by metal microporous filter membranes, and the tank bottom is discharged by a valve;

a swinging fluid stirring device is arranged in the anaerobic/anoxic tank; the pendulum fluid stirring device comprises a group of flexible pipes submerged into the slurry, and a pipe head is connected with a pendulum bob with certain mass;

the oscillating fluid stirring device receives the pressurized slurry from the reflux pump; the slurry passes through the flexible pipe, and is combined with the irregular bending of the flexible pipe by means of the internal pressure fluctuation to push the pipeline to shake and swing, and the slurry outlet of the flexible pipe randomly jumps in a certain area under the rotation and swing limitation of the pendulum bob, so that sludge slurry is distributed to the predetermined area of the reactor to push the slurry in the reactor to be disturbed and flow upwards;

2. The domestic sewage treatment upgrading process according to claim 1, characterized in that:

a planetary stirring device is arranged in the anaerobic/anoxic tank;

the planetary stirring device comprises a transmission device, at least 2 end discs, a radiation arm plate, a double-end hanging arm plate, a fixed star blade paddle and a movable star blade paddle;

the transmission device is fixed on the top cover of the anaerobic/anoxic tank; the chain is connected with the driving gear and the driven gear; the driven gear is connected to the central shaft through a key; the end disc is strung on the central shaft;

the fixed star blade paddle is formed by radially arranging and welding plates provided with a certain amount of holes or grooves or seams, two ends of the fixed star blade paddle are connected with 2 shaft heads in an insertion welding or bolting mode and fixed on a certain radius of the end plate to form a cage-shaped frame;

the end disc is a circular plate, the middle of the end disc is provided with a shaft hole, the periphery of the end disc is also provided with uniform distribution holes, and at least 2 end discs are strung on the central shaft; the periphery of the end disc radially extends out of the radial arm plate; one end of the radiation arm plate is fixed on the end disc through a bolt, and a shaft shoulder orthogonally extends out of one end of the radiation arm plate; the end disc and the radiation arm plate can be combined into a whole;

the movable star blade paddle is formed by radially arranging and welding plates provided with a certain amount of holes or grooves or seams, two ends of the movable star blade paddle are connected with 2 shaft heads in an inserting welding or bolting mode, and the length of the movable star blade paddle is slightly larger than that of the fixed star blade paddle;

the two ends of the double-end wall hanging plate are provided with holes, one end of the double-end wall hanging plate is hung on the shaft shoulders of the radiation wall hanging plate, shaft sleeves or bearings are arranged between the two ends of the double-end wall hanging plate for transition, and the other end of the double-end wall hanging plate is hung on the movable star blade slurry in a pivot mode;

3. The utility model provides a mark device is carried in domestic sewage treatment for domestic sewage treatment, including equalizing basin, elevator pump, area stirring anaerobism/oxygen deficiency pond, good oxygen pond, roots's fan, well water pump, backwash pump, its characterized in that:

a filtering tank is arranged behind the aerobic tank, and a sludge reflux pump extracts sludge from the filtering tank and conveys the sludge to the anaerobic/anoxic tank; a metal microporous filter is embedded in the filter tank, the lower part of the filter is opened to receive slurry, the slurry passes through the vertical metal microporous filter element group and enters an overflow area, at least one joint is led out from the overflow area at the upper part of the filter, and the slurry passes through the filter tank after being sealed and is connected with a reclaimed water pump through a valve A;

an aeration head and biological filler are arranged in the aerobic tank, and an aeration pipeline is communicated with the Roots blower;

the aeration pipeline is provided with a bypass and is communicated with the filter overflow cavity through a valve B;

a pipeline behind the reflux pump is provided with a bypass and is communicated with the pressure filter through a valve C;

or in addition to that, the system may further include,

the anaerobic/anoxic tank with stirring function, the aerobic tank and the filtering tank are connected into a whole, the metal microporous filter is embedded into the filtering tank, and the filter press is integrated outside the body;

or still further in that,

the anaerobic/anoxic tank, the aerobic tank, the filter tank and the equipment room are sequentially connected into a box body in a separated mode, the metal microporous filter is embedded into the filter tank, and the Roots blower, the reflux pump, the reclaimed water pump, the electrical cabinet and the control cabinet are integrated in the equipment room; the filter press is integrated outside the box body;

the stirring device arranged in the anaerobic/anoxic tank is a pendulum fluid stirrer;

the pendulum fluid stirrer comprises at least one inlet joint, a set of pipelines for distributing fluid, a plurality of orthogonal interfaces and a flat cloth pipe, wherein the pipelines are fixedly hung on the upper cover of the anaerobic/anoxic tank, the plurality of orthogonal interfaces are arranged in a radial or annular or rectangular array and have consistent directions, and one end of the flat cloth pipe is blind; the vertical pipe is either a hard pipe or a flexible pipe; the adjustable joint is a quick-connection joint, or a rotatable quick-connection joint, or a quick-adjustable joint, preferably a rotatable quick-connection joint;

4. The domestic sewage treatment upgrading device of claim 3, characterized in that:

the stirring device arranged in the anaerobic/anoxic tank is a planetary stirrer;

the planetary stirrer comprises a transmission device, an end disc, a radiation arm plate, a double-end hanging arm plate, a fixed star blade paddle and a movable star blade paddle;

the transmission device comprises a motor speed reducer, a driving gear, a chain, a driven gear, a base, a suspension arm, a bearing seat and a central shaft; shaft shoulders are arranged at two ends of the central shaft and connected with a bearing seat, and the bearing seat is hung by the suspension arm and fixed on the base; the motor speed reducer is also fixed on the base; the chain is connected with the driving gear and the driven gear; the driven gear is connected to the central shaft through a key;

the fixed star blade paddle is formed by radially arranging and welding plates provided with a certain amount of holes or grooves or seams, and two ends of the fixed star blade paddle are connected with 2 shaft heads in an insertion welding or bolting mode;

at least 2 fixed star blade paddles are fixed on the periphery of the end disc through a group of bolts to form a cage-shaped frame;