CN114835344A

CN114835344A - Efficient and energy-saving sewage treatment system and treatment method

Info

Publication number: CN114835344A
Application number: CN202210581247.1A
Authority: CN
Inventors: 黄培勋; 张海洋; 黄文博; 姚曼; 黄文华; 黄立伟; 李彦春; 赵东原
Original assignee: Zhengzhou Bixing Environmental Protection Technology Co ltd
Current assignee: Zhengzhou Bixing Environmental Protection Technology Co ltd
Priority date: 2022-05-26
Filing date: 2022-05-26
Publication date: 2022-08-02
Anticipated expiration: 2042-05-26
Also published as: CN114835344B

Abstract

The invention discloses a high-efficiency energy-saving sewage treatment system, which comprises a pre-filtering system, a first-stage microfiltration device, a double-micro generator, a denitrification tank, a regulating tank, a potential energy biological sewage purifier, a denitrification backflow system, a second-stage microfiltration device, a sludge recycling system and a disinfection sedimentation tank which are sequentially arranged along the flow direction of sewage. The effluent of the pre-filtering system flows into a first-stage microfiltration device, and impurities such as micro particles and the like which cannot be removed in the oil separation sedimentation tank are removed in the first-stage microfiltration device; the double micro generators realize effective anaerobic and micron-grade filtration; the potential energy biological sewage purifier realizes a multi-stage A/O process. The invention has the characteristics of good effluent index and low power consumption, and the sewage can reach the main standards of class III water in the environmental quality standards of surface water after being treated.

Description

Efficient and energy-saving sewage treatment system and treatment method

Technical Field

The invention relates to a sewage treatment system, in particular to a high-efficiency and energy-saving sewage treatment system.

Background

The sewage treatment system is used for treating sewage generated in daily activities by using professional sewage treatment equipment so as to reach the discharge standard. The existing sewage treatment mode generally deposits the impurities of the sewage through a sewage sedimentation tank, removes organic matters in the water through anaerobic and aerobic treatment, and has long treatment period.

Chinese patent: 201720857431.9 discloses an efficient treatment system for urban sewage, which adopts multi-stage treatment equipment to treat sewage, degrades micromolecular pollutants in the sewage, and simultaneously, a membrane module carries out deep filtration on the sewage, but the sewage treatment system needs to consume a large amount of electric energy, has high purification treatment cost, and is not in line with the environmental protection concept of low carbon and energy saving.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides an efficient and energy-saving sewage treatment system, which improves the sewage purification effect.

The technical scheme adopted for achieving the purpose is as follows:

an efficient and energy-saving sewage treatment system comprises a pre-filtering system, a first-stage microfiltration device, a double-micro generator, a denitrification tank, a regulating tank, a potential energy biological sewage purifier, a denitrification reflux system, a second-stage microfiltration device, a sludge recycling system and a disinfection sedimentation tank which are sequentially arranged along the flow direction of sewage;

the effluent of the pre-filtering system flows into the microfiltration equipment of the first stage, and the microfiltration equipment of the first stage removes impurities such as tiny particles and the like which cannot be removed in the pre-filtering system.

The pre-filtering system comprises a grid and an oil separation sedimentation tank, wherein a water outlet of the grid is communicated with the oil separation sedimentation tank, an outlet of the oil separation sedimentation tank is communicated with a first-stage microfiltration device, the grid preliminarily intercepts large-particle undegraded organic matters in sewage, the intercepted sewage flows into the oil separation sedimentation tank, low-density substances float on the water surface in the oil separation sedimentation tank, high-density substances are settled at the bottom of the tank, and supernatant flows into the first-stage microfiltration device through the outlet;

a water outlet pump is arranged in the regulating tank, a water inlet is arranged at one end of the regulating tank, the water inlet is connected with the denitrification tank, the water outlet pump is connected with a potential energy biological sewage purifier, and the regulating tank is used for storing sewage purified by the denitrification tank, regulating water quantity and homogenizing water quality;

the potential energy biological sewage purifier realizes atmosphere reoxygenation, improves dissolved oxygen in water and removes nitrogen and phosphorus.

The denitrification backflow system comprises a purification tank, one end of the purification tank is communicated with a potential energy biological sewage purifier, the other end of the purification tank is communicated with a second-stage microfiltration device, a water outlet pump is arranged in the purification tank and connected with a denitrification tank, and the denitrification tank is returned to the denitrification tank in a necessary proportion by adjusting the flow of the water outlet pump according to the detection index of the water quality condition;

the sludge recycling system comprises an activated sludge tank, the microfiltration equipment of the second stage is communicated with the activated sludge tank, water filtered by the microfiltration equipment of the second stage is discharged into the disinfection sedimentation tank, intercepted activated sludge and suspended matters are discharged into the activated sludge tank by the microfiltration equipment of the second stage, the mixed liquid in the activated sludge tank is used as a carbon source part to flow back to the denitrification tank according to the water quality condition, and the rest part is transported and treated after being statically precipitated.

The water purification microfiltration equipment comprises a water storage tank, wherein a first water inlet and a first water outlet are respectively arranged on the water storage tank, a filter screen unit is arranged in the water storage tank, the lower part of the water storage tank is fixedly connected with a bottom plate, a through hole is formed in the bottom plate, the filter screen unit is arranged on the periphery of the through hole, a bottom plate water outlet is formed in the side part of the bottom plate, the bottom plate water outlet is communicated with the first water outlet, and a cleaning mechanism is arranged in the filter screen unit.

The upper part of the bottom plate is provided with a water outlet which is positioned at the outer side of the filter screen unit, the side part of the water storage tank is provided with a second water outlet, the side part of the bottom plate is provided with a sewage port which is communicated with the second water outlet, and the water outlet is provided with a water draining mechanism;

the number of the filter screen units is multiple, and through holes corresponding to the number of the filter screen units are formed in the bottom plate;

the filter screen unit comprises a frame and a filter screen, the frame is formed by welding metal pipes, the frame is fixedly connected to the periphery of the through hole, the filter screen is fixedly connected to the side part of the frame, and a cleaning mechanism is arranged in the frame;

the range of the filter screen is 800-1200 meshes.

The cleaning mechanism comprises a first mounting pipe and a second mounting pipe, the first mounting pipe is arranged at the upper part of the frame, the second mounting pipe is arranged at the lower part of the frame, the first mounting pipe and the second mounting pipe are arranged in the same plane, a spray pipe is rotatably connected between the first mounting pipe and the second mounting pipe, the length of the spray pipe is matched with the height of the filter screen, a plurality of spray heads are arranged on the spray pipe and uniformly arranged on the spray pipe, a water flow pipe is fixedly connected to the upper part of the spray pipe, and the water flow pipe is connected with a second high-pressure water pump;

the water drainage mechanism comprises a water storage plate, the lower part of the water storage plate is fixedly connected with a water storage bin, the bottom of the water storage bin is provided with a drainage pipe and a flow inlet pipe, the diameter of the drainage pipe is smaller than that of the flow inlet pipe, the flow inlet pipe is connected with a first high-pressure water pump, the upper part of the water storage plate is provided with a water bag, guide columns are respectively arranged on two sides of the water storage plate in a penetrating manner, one end of each guide column is fixedly connected with a first sealing plate, the top of each guide column is fixedly connected with a second sealing plate, the first sealing plate is arranged above the water drainage opening, and the water storage plate is fixedly connected with a bottom plate through a stand column;

the upper portion of water tank is equipped with level sensor, and level sensor is connected with the controller, first high pressure water pump and second high pressure water pump are connected respectively to the controller, and the controller is connected with control panel, is equipped with the warning light on the control panel.

The potential energy biological sewage purifier comprises an upper water tank component and a standard layer component, wherein a bacterial bed is arranged in the standard layer component, the upper water tank component comprises a fifth water storage tank, the upper part of the fifth water storage tank is provided with a first water storage tank, the fifth water storage tank is communicated with the first water storage tank, the first water storage tank is communicated with a second tank body component through a first tank body water drainage mechanism, the fifth water storage tank is communicated with the standard layer component through a second tank body component, the bottom of the fifth water storage tank is provided with a fourth tank body component, and the fourth tank body component is arranged in the standard layer component of the upper stage between the adjacent standard layers.

The first box body water discharging mechanism comprises a communicating pipe and a first floating shaft, a first sealing ball is arranged at one end of the first floating shaft, a floating body is arranged at the other end of the first floating shaft, a first water inlet is arranged at one end of the communicating pipe, a through hole is formed in the other end of the communicating pipe, the first floating shaft respectively penetrates through the first water inlet at one end of the communicating pipe and the through hole at the other end of the communicating pipe, and the first sealing ball is positioned above the first water inlet;

one side of the communicating pipe is connected with a bent pipe, and the other end of the bent pipe is connected with a second box body assembly;

the second tank body assembly comprises a second water storage tank and a second water outlet mechanism, the second water storage tank is connected with a fifth water storage tank through a supporting leg, one side of the second water storage tank is connected with the other end of the bent pipe, the bottom of the fifth water storage tank is provided with a water outlet, a first-stage standard layer is arranged below the water outlet, the second water outlet mechanism is arranged between the water outlet and the fifth water storage tank, the upper edge of the second water storage tank is in a non-closed state, the bottom of the second water storage tank is provided with a second water outlet, and the outer side of the second water outlet is provided with a second water discharging mechanism;

the second water outlet mechanism comprises a second floating shaft, a second float and a second sealing plate, the bottom of the second water storage tank is provided with a through hole, the second floating shaft is arranged in the through hole, one end of the second floating shaft is fixedly connected with the second float, the second float is arranged in the second water storage tank, the other end of the second floating shaft is fixedly connected with the second sealing plate, and the second sealing plate is arranged above the water outlet;

the second water discharging mechanism comprises a second floating shaft support, a second floating shaft and a second sealing float, the second floating shaft support is fixedly connected with the bottom of the second water storage tank, a through hole is formed in the second floating shaft support, the second floating shaft is arranged in the through hole, the end part of the second floating shaft is fixedly connected with the second sealing float, and the second sealing float is arranged on the outer side of the second water discharging opening;

the fourth tank body assembly comprises a fourth water storage tank, a fourth water discharging mechanism and a fourth water discharging mechanism, a water inlet pipe is arranged at the bottom of the fourth water storage tank, the fourth water discharging mechanism is arranged at the bottom of the fourth water storage tank, and the two fourth water storage tanks are connected through the fourth water discharging mechanism;

the fourth water outlet mechanism comprises a connecting rod, a pull shaft and a fourth sealing plate, the two fourth water storage tanks are fixedly connected through the connecting rod, one end of the pull shaft penetrates through the pull rod to enter the standard layer, the end part of the pull shaft is fixedly connected with the fourth sealing plate, and the fourth sealing plate is arranged at the position of a water outlet on the standard layer;

the fourth water discharging mechanism comprises a fourth floating shaft and a fourth floating seal, a floating shaft hole is formed in the middle of the fourth water storage tank, water discharging holes are formed in the periphery of the floating shaft hole, the fourth floating shaft is arranged in the floating shaft hole, and the fourth floating seal is arranged at the bottom of the fourth floating shaft;

the bottom of the fourth water storage tank is provided with supporting legs.

A third box body is arranged in the fifth water storage tank, the third box body comprises a third water storage tank and a third water outlet mechanism, a third water outlet is formed in the bottom of the third water storage tank and is communicated with the fifth water storage tank, the third water outlet mechanism is arranged above the third water outlet and comprises a third water dividing tank, the third water dividing tank and the third water storage tank are fixedly connected through supporting legs, a through hole is formed in the middle of the bottom of the third water dividing tank, a third connecting rod is arranged in the through hole, one end of the third connecting rod is fixedly connected with a third sealing plate, and the other end of the third connecting rod is fixedly connected with a third float;

a third water discharge outlet is arranged at the bottom of the third sub-water tank and communicated with a third water storage tank, and a third water discharge mechanism is arranged on the outer side of the third water discharge outlet;

the third drainage mechanism comprises a third floating shaft and a third floating seal, a track hole is formed in the inner side of a third drainage outlet in the bottom of the third sub-water tank, the third floating shaft is arranged in the track hole, and one end of the third floating shaft is fixedly connected with the third floating seal.

The invention also discloses a sewage treatment method for treating sewage by the sewage treatment system, which comprises the following steps:

s0: the sewage primarily intercepts large-particle undegraded organic matters of the sewage through a grid, the intercepted sewage flows into an oil separation sedimentation tank, low-density substances float to the water surface in the oil separation sedimentation tank, high-density substances sink to the bottom of the tank, and supernatant flows into a first-stage microfiltration device through an outlet;

s1: a filter screen unit in the microfiltration equipment filters to remove impurities such as micro particles and the like which cannot be removed in the oil separation sedimentation tank, and effluent flows into the double-micro generator to adsorb and degrade pollutant particles to be degraded in sewage, so that high-efficiency anaerobic reaction is realized;

s3: the effluent of the double micro generators enters a denitrification tank for biochemical reaction to realize denitrification and dephosphorization;

s4: the effluent of the denitrification tank enters an adjusting tank for storing filtered sewage, adjusting water quantity and homogenizing water quality, extracting the sewage in the adjusting tank, sending the sewage into a potential energy biological sewage purifier, realizing automatic repeated A/O among standard layer components by means of potential energy, and reducing COD (chemical oxygen demand), BOD (biochemical oxygen demand), ammonia nitrogen and total nitrogen indexes in the sewage;

s5: the effluent of the potential energy biological sewage purifier enters a purifying tank, and water with a certain proportion flows back to S3 according to the water quality detection index condition;

s6: the effluent of the purification tank flows into a second-stage microfiltration device, the water filtered by the second-stage microfiltration device is discharged into a disinfection sedimentation tank, and pathogenic microorganisms, such as bacteria, viruses and the like, residual in the water, odor and phosphorus are removed in the disinfection sedimentation tank through chemical adding, sedimentation and disinfection, and the effluent is discharged after reaching the standard;

s7: the micro-filtration equipment discharges the intercepted activated sludge and suspended matters into an activated sludge tank, and the mixed liquid which flows back to the activated sludge tank in a certain proportion enters S3 according to the detection condition of water quality.

The invention has the following beneficial effects:

1. the invention has the characteristics of good effluent index and low power consumption, large-particle undegraded organic matters of sewage are initially intercepted by a grating, then low-density substances float to the water surface by utilizing oil separation precipitation, high-density substances are settled at the bottom of a tank, supernatant fluid flows into a microfiltration device, impurities such as tiny particles and the like which cannot be removed in an oil separation sedimentation tank are removed, micron-grade filtration is carried out by double micro generators to remove fine impurities and carry out anaerobic treatment, denitrification and dephosphorization are realized by biochemical reaction in a denitrification tank, potential energy biological sewage purifier reduces COD, BOD, ammonia nitrogen and total nitrogen indexes in sewage, the sewage flows into a second-stage microfiltration device after passing through a purification tank, and the sewage is discharged after being filtered and disinfected and precipitated;

according to the water quality condition detection index, the water in the purification tank is refluxed to the denitrification tank by a certain proportion by using a denitrification reflux system to be purified again;

and the activated sludge and suspended matters intercepted by the second stage are discharged into an activated sludge tank by using a sludge recycling system, the mixed liquid in the activated sludge tank is partially returned to the denitrification tank as a carbon source according to the water quality condition, and the rest part is transported out after being settled, so that the production cost can be further saved, and the green development concept of recycling is met.

In particular, sewage is filtered layer by layer in different specifications through a grating, an oil separation sedimentation tank, a microfiltration device and a double-micro generator, so that the permeation and filtration efficiency is enhanced, the blockage of impurities on a filter material is reduced, and the anaerobic property is facilitated.

2. The micro-filtration equipment adopted in the invention increases the area of the filter screen by arranging a plurality of groups of filter screen mechanisms in the water tank, improves the purification efficiency, solves the problem that the filter screen is easy to block by designing the cleaning mechanism and washing the filter screen by using high-pressure water, and designs the water drainage mechanism to discharge the water in the water tank before washing the filter screen, thereby further improving the cleaning effect of the filter screen.

3. The potential energy biological sewage purifier adopted by the invention has the advantages that the upper water tank realizes uninterrupted continuous water supply, the intellectualization is realized, and the failure rate is reduced; the atmospheric reoxygenation is realized by the multi-layer standard layer component through potential energy, and the energy consumption is low; the multi-layer automatic repeated A/O has good treatment effect, and effectively reduces COD, BOD, ammonia nitrogen and total nitrogen indexes in the sewage.

The device can realize atmospheric reoxygenation rapidly and repeatedly, does not need blast aeration, only improves the dissolved oxygen in water by water potential energy, has low energy consumption, synchronously realizes dephosphorization, and has the characteristics of high efficiency and energy saving.

Drawings

FIG. 1 is a schematic view of the structure of a sewage treatment system according to the present invention;

FIG. 2 is a schematic view of the microfiltration apparatus;

FIG. 3 is a top view of the microfiltration device;

FIG. 4 is a schematic diagram of the bottom plate structure of the microfiltration device;

FIG. 5 is a schematic structural diagram of a potential energy biological sewage purifier;

FIG. 6 is a schematic view of the structure at A in FIG. 5;

FIG. 7 is a top view of the potential energy biological sewage purifier;

FIG. 8 is a cross-sectional view taken along line B-B of FIG. 5;

fig. 9 is a schematic view of the structure at B in fig. 8.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1-7, a high-efficiency energy-saving sewage treatment system comprises a pre-filtration system, a first-stage microfiltration device, a double-micro generator, a denitrification tank, a regulating tank, a potential energy biological sewage purifier, a denitrification reflux system, a second-stage microfiltration device, a sludge recycling system and a disinfection sedimentation tank which are sequentially arranged along the flow direction of sewage;

the effluent of the pre-filtering system flows into the micro-filtering equipment of the first stage, and the pre-filtering system removes impurities such as micro-particles and the like which cannot be removed in the oil separation sedimentation tank.

The pre-filtering system comprises a grating and an oil separation sedimentation tank, the water outlet of the grating is communicated with the oil separation sedimentation tank, and the outlet of the oil separation sedimentation tank is communicated with the first-stage microfiltration equipment. The oil separation sedimentation tank is used for settling larger waste particles to the bottom of the tank by utilizing the principle of density and specific gravity difference of different substances, and removing lighter waste particles floating on the oil surface. One end of the oil separation sedimentation tank is provided with an inlet, the other end of the oil separation sedimentation tank is provided with an outlet, and the inlet and the outlet are used for the inlet and the outlet of sewage. The upper part of the outlet is provided with an upper opening, the upper opening is used for discharging grease formed in the oil separation sedimentation tank, the lower part of the outlet is provided with a lower opening, and the lower opening is used for removing sediments. And a valve is arranged at the inlet of the oil separation sedimentation tank and used for opening and closing the inflow of sewage and regulating the flow rate. The prior art is adopted for the grating and the oil separation sedimentation tank.

During work, the grating primarily intercepts large-particle undegraded organic matters in sewage, the intercepted sewage flows into the oil separation sedimentation tank, low-density substances float to the water surface in the oil separation sedimentation tank, high-density substances sink to the bottom of the tank, and supernatant flows into the first-stage microfiltration equipment through the outlet;

the micro-filtration equipment of first order effectively gets rid of in separating oil sedimentation tank impurity such as tiny particle that can not get rid of, goes out water inflow two micro-generators, two micro-generators belong to the filter from the broad sense, filter screen in the filter sets up along the horizontal direction, and sewage is from up flowing through two micro-generators down, anaerobic microorganism has been added to the lower part of two micro-generators, the filter screen of two micro-generators is the micron order. The double-micro generator is used for filtering in a micron level and performing long-time microbial anaerobic treatment to enable effluent to be cleaner. The double micro-generator adopts the prior art.

And sewage discharged by the double micro generators flows into a denitrification tank for denitrification to realize denitrification and dephosphorization. The denitrification pool adopts the conventional technical means.

The regulating tank is used for storing the sewage purified by the denitrification tank, regulating the water quantity and homogenizing the water quality, so that the subsequent process works under relatively stable conditions, and the sewage is treated by the regulating tank and then supplied to the potential energy biological sewage purifier. Be equipped with out the water pump in the equalizing basin, the one end of equalizing basin is equipped with the water inlet, water inlet and denitrification pond intercommunication, the drinking-water pipe connection potential energy biological sewage purification ware on the play water pump. During work, sewage in the regulating reservoir is pumped by a water pump, and water is input into the potential energy biological sewage purifier through a water pumping pipe.

The denitrification backflow system comprises a purification tank, a water outlet pump is arranged in the purification tank, the purification tank is communicated with a second-stage microfiltration device, the water outlet pump is connected with a denitrification tank, and the required proportion is realized by adjusting the flow of the water outlet pump to flow back to the denitrification tank according to the detection index of the water quality condition;

the sewage discharged from the purification tank flows into the microfiltration equipment of the second stage, the first water outlet of the microfiltration equipment of the second stage is communicated with the disinfection sedimentation tank, and the second water outlet of the microfiltration equipment is connected with the sludge recycling system. In the work, the water filtered by the microfiltration equipment is discharged into the disinfection sedimentation tank, and the microfiltration equipment discharges the intercepted activated sludge and suspended matters into the sludge recycling system.

The water filtered by the microfiltration equipment is discharged into a disinfection sedimentation tank, pathogenic microorganisms such as bacteria and viruses, odor and phosphorus remained in the water are removed in the disinfection sedimentation tank through dosing, sedimentation and disinfection, and the discharged water reaches the standard and is discharged.

As shown in the figure 2-4, the first-stage microfiltration device adopted in the invention has the same structure as the second-stage filtration device, and comprises a water storage tank 6-1, the side part of the water storage tank 6-1 is respectively provided with a first water outlet 6-3 and a first water inlet 6-2, four groups of rectangular filter screen units are arranged in the water storage tank 6-1, the filter screen units are utilized to accurately and efficiently filter impurities contained in sewage, the bottom of the water storage tank is fixedly connected with a bottom plate 6-4, the bottom plate 6-4 is of a hollow structure, four groups of rectangular through holes 6-5 are arranged at the upper part of the bottom plate 6-4, the positions and the number of the through holes 6-5 correspond to those of the filter screen units, the side part of the bottom plate 6-4 is provided with a bottom plate water outlet 6-6, and the bottom plate water outlet 6-6 is communicated with the first water outlet 6-3. When the water storage tank works, sewage enters the water storage tank 6-1 through the first water inlet 6-2, the filter screen unit filters the sewage, and the filtered sewage enters the bottom plate 6-4 through the through hole 6-5 and is discharged through the bottom plate water outlet 6-6 and the first water outlet 6-3.

The filter screen unit comprises a rectangular frame 6-7, the frame 6-7 is formed by welding metal pipes, the frame 6-7 is fixedly connected to the periphery of the through hole 6-5, the side part of the frame 6-7 is fixedly connected with a filter screen 6-8, the range of the filter screen 6-8 is 800-1200 meshes, and the filter screen 6-8 with a smaller specification is selected to improve the sewage purification effect.

In order to further realize the recycling of the filter screen, a cleaning mechanism is arranged in the filter screen unit and comprises a first mounting pipe 6-9 and a second mounting pipe, the first mounting pipe 6-9 is fixedly connected to the upper part of the frame 6-7 in the horizontal direction, the second mounting pipe is fixedly connected to the lower part of the frame 6-7 in the horizontal direction, the first mounting pipe 6-9 and the second mounting pipe are positioned in the same plane vertical to the bottom plate, a water spray pipe 6-10 is rotatably connected between the first mounting pipe 6-9 and the second mounting pipe, the length of the water spray pipe 6-10 is matched with the height of the filter screen 6-8, a plurality of water spray heads 6-11 are arranged on the water spray pipe 6-10 in the vertical direction, the water spray heads 6-11 are equidistantly distributed on two symmetrical sides of the water spray pipes 6-10, the number of one side is odd, the number of the other side is even, and the water spray heads 6-11 on each side are uniformly distributed. The water spraying direction of the water spraying heads 6-11 is the same-direction bending, and an included angle is formed between the water spraying direction and the water spraying pipes 6-10. And the upper parts of the water spraying pipes 6 to 10 are fixedly connected with water flow pipes, and the water flow pipes are connected with a second high-pressure water pump.

When the cleaning device works, high-pressure water in the water flow pipe enters the water spray pipe 6-10 and is filled in the inner cavity, the high-pressure water is sprayed out from the water spray head 6-11 to clean the filter screen, and the sprayed high-pressure water generates reaction force on the water spray pipe 6-10 due to the fact that the water spray direction of the water spray head 6-11 is bent in the same direction, so that the water spray pipe 6-10 rotates to do circular motion to drive the water spray head 6-11 to clean the filter screen from multiple angles.

In order to clean the filter screen, water in the water storage tank 6-1 needs to be discharged, and the impact force on the filter screen is increased. The upper end face of the bottom plate 6-4 is provided with a water drainage opening 6-22, the side part of the water storage tank 6-1 is provided with a second water outlet 6-20, the side part of the bottom plate 6-4 is provided with a sewage opening 6-23 at a position corresponding to the second water outlet 6-20, the sewage opening 6-23 is communicated with the second water outlet 6-20, and the upper part of the water drainage opening 6-22 is sealed with a water drainage mechanism.

The water draining mechanism comprises water storage plates 6-12, the lower parts of the water storage plates 6-12 are fixedly connected with water storage bins 6-13, the bottoms of the water storage bins 6-13 are provided with drain pipes 6-14 and inlet pipes 6-15, the diameters of the drain pipes 6-14 are smaller than those of the inlet pipes 6-15, the inlet pipes 6-15 are connected with a first high-pressure water pump, the water storage plates 6-12 are provided with water storage ports which are communicated with the water storage bins 6-13, the water storage ports are sealed with water bags 6-16, two sides of the water storage plates 6-12 are movably connected with guide columns 6-17, the bottoms of the guide columns 6-17 are fixedly connected with first sealing plates 6-18, the upper parts of the guide columns 6-17 are fixedly connected with second sealing plates 6-19, the first sealing plates 6-18 are arranged above the water draining ports 6-22, the water storage plate 6-12 is fixedly connected with the bottom plate 6-4 through an upright post.

When the water storage tank works, high-pressure water enters the water storage bin through the flow inlet pipe 6-15, the water bags 6-16 are gradually supported by the high-pressure water in the water storage bin 6-13, the second sealing plate 6-19 is jacked up along with the increase of the volume of the water bags 6-16, so that the guide column 6-17 drives the first sealing plate 6-18 to move upwards, the water outlet 6-22 is opened, water in the water storage bin 6-1 is discharged, and the filter screen is convenient to clean by a cleaning mechanism; the first high-pressure water pump continuously supplies water to the water bags 6-16, the water in the water bags 6-16 is discharged through the drain pipes 6-14, and the drain openings are always in an open state because the diameter of the drain pipes 6-14 is smaller than that of the inlet pipes 6-15.

The upper portion of the water storage tank 6-1 is provided with a liquid level sensor 6-21, the liquid level sensor 6-21 is connected with a controller, the controller is respectively connected with a first high-pressure water pump and a second high-pressure water pump, the controller is arranged in a control panel, a warning device is arranged on the control panel, the first high-pressure water pump is connected with a flow inlet pipe 6-15, the water bag is propped up by high-pressure water, so that a water drainage opening 6-22 is opened, the second high-pressure water pump is connected with a water flow pipe, and the high-pressure water is sprayed out through a water spray head 6-11, so that a filter screen is cleaned.

When the water storage tank works, after water in the water storage tank 6-1 reaches the warning line, the liquid level sensor 6-21 sends an electric signal to the controller, the warning device gives an alarm, an operator closes the first water outlet 6-3 and opens the second water outlet 6-20, the first high-pressure water pump is started through the control panel, so that the water outlet 6-22 is opened, sewage in the water storage tank 6-1 is discharged through the second water outlet 6-20, the second high-pressure water pump is started through the control panel, high-pressure water of the second high-pressure water pump enters the water spray pipe 6-10, and the high-pressure water is sprayed out from the water spray head 6-11, so that the filter screen is cleaned.

As shown in figures 5-7, the invention is a potential energy biological sewage purifier, which comprises an upper water tank part and standard layer parts, wherein the upper water tank part comprises a fifth water storage tank 5, the upper part of the fifth water storage tank 5 is provided with a first water storage tank 1, the lower part of the first water storage tank 1 is provided with a second tank body component 2, the fifth water storage tank 5 is communicated with the first water storage tank 1, the first water storage tank 1 is communicated with the second tank body component 2 through a first tank body water discharging mechanism, the bottom of the fifth water storage tank 5 is fixedly connected with the first-stage standard layer part, the fifth water storage tank 5 is communicated with the first-stage standard layer part through a second tank body component 2, the bottom of the fifth water storage tank 5 is provided with a fourth tank body component for controlling the water discharging of the first-stage standard layer part, and a fourth tank body component is arranged in the upper-stage standard layer part between the adjacent standard layers, used for controlling the water discharge of the standard layer component of the next level.

The first water storage tank 1 and the fifth water storage tank 5 are fixedly connected through supporting legs, one side of the first water storage tank 1 is provided with a water outlet pipe 1-4, and the water outlet pipe 1-4 is used for communicating the first water storage tank 1 and the fifth water storage tank 5.

The first box body water discharging mechanism comprises a communicating pipe 1-1 and a first floating shaft 1-8, one end of the communicating pipe 1-1 is provided with a first water inlet 1-3, the other end of the communicating pipe 1-1 is provided with a through hole, the through hole is internally provided with the first floating shaft 1-8, one end of the first floating shaft 1-8 is provided with a first sealing ball 1-2, the other end of the first floating shaft 1-8 is provided with a floating body 1-6, the first floating shaft 1-8 respectively penetrates through the first water inlet at one end of the communicating pipe 1-1 and the through hole at the other end, and the first sealing ball 1-2 is positioned above the first water inlet 1-3.

The side part of the other end of the communicating pipe 1-1 is connected with an elbow pipe 1-5, and the other end of the elbow pipe 1-5 is connected with a second box body component 2.

When the water-saving water tank works, sewage is injected into the first water storage tank 1, the sewage in the first water storage tank 1 enters the fifth water storage tank 5 through the water outlet pipe 1-4, the floating body 1-6 drives the first floating shaft 1-8 and the first sealing ball 1-2 to move upwards along with the rising of the water level in the fifth water storage tank 5, so that the first water inlet 1-3 is opened, and the sewage in the first water storage tank 1 enters the second tank body component 2 through the first water inlet 1-3 and the bent pipe 1-5.

The second tank body assembly 2 is arranged in the fifth water storage tank 5, the second tank body assembly 2 comprises a second water storage tank 2-1 and a second water outlet mechanism, the second water storage tank 2-1 is fixedly connected with the fifth water storage tank 5 through supporting legs, a water outlet 2-5 is formed in the bottom of the fifth water storage tank 5, a first-level standard layer is connected to the lower portion of the water outlet 2-5, the second water outlet mechanism is arranged between the water outlet 2-5 and the second water storage tank 2-1, and the second water outlet mechanism is used for controlling the opening and closing of the water outlet 2-5. One side of the second water storage tank 2-1 is connected with the other end of the elbow pipe 1-5 and is a water inlet of the second water storage tank 2-1.

The second water outlet mechanism comprises a second floating shaft 2-3, a second floating shaft 2-2 and a second sealing plate 2-4, a through hole is formed in the middle of the bottom of the second water storage tank 2-1, the second floating shaft 2-3 is arranged in the through hole, one end of the second floating shaft 2-3 is fixedly connected with the second floating shaft 2-2, the second floating shaft 2-2 is arranged in the second water storage tank, the other end of the second floating shaft 2-3 is fixedly connected with the second sealing plate 2-4, and the second sealing plate 2-4 is arranged above the water outlet 2-5.

The upper edge of the second water storage tank 2-1 is in a non-closed state, the bottom of the second water storage tank 2-1 is provided with a second water discharge opening 2-6, water in the second water storage tank 2-1 is discharged into a fifth water storage tank 5 through the second water discharge opening 2-6, and a second water discharge mechanism is arranged on the outer side of the second water discharge opening 2-6 and used for controlling the opening and closing of the second water discharge opening 2-6 and discharging sewage in the second water storage tank 2-1 completely.

When the water-saving device works, sewage enters the second water storage tank 2-1 through the bent pipe 1-5, water in the fifth water storage tank 5 overflows into the second water storage tank 2 through the upper edge of the second water storage tank 2-1, and when the buoyancy force of the second float 2-2 is larger than the load of the second float, the second float 2-2 drives the second float shaft 2-3 and the second sealing plate 2-4 to move upwards, so that the water outlet 2-5 is opened.

The second water discharging mechanism comprises a second floating shaft support 2-9, a second sealed floating shaft 2-8 and a second sealed floating shaft 2-7, the second floating shaft support 2-9 is fixedly connected with the bottom of the second water storage tank 2, a through hole is formed in the second floating shaft support 2-9, the second sealed floating shaft 2-8 is arranged in the through hole, the second sealed floating shaft 2-8 moves up and down along the through hole, the end part of the second sealed floating shaft 2-8 is fixedly connected with the second sealed floating shaft 2-7, and the second sealed floating shaft 2-7 is arranged on the outer side of the second water outlet 2-6.

When the water-saving water storage tank works, the water level line in the fifth water storage tank 5 descends along with the water discharge of the water outlets 2-5, the second sealing float 2-7 moves downwards along with the descending of the water level line, so that the second water outlet 2-6 is opened, water in the second water storage tank 2-1 flows out through the second water discharge outlet 2-6, and meanwhile, the second float 2-2 drives the second sealing plate 2-4 to move downwards along with the descending of the water level in the second water storage tank 2, so that the water outlets 2-5 are closed.

The fourth box body assembly comprises a fourth water storage tank 4, a fourth water discharging mechanism and a fourth water discharging mechanism, a water inlet pipe 4-3 is arranged at the bottom of the fourth water storage tank 4 and used for discharging water from a fifth water storage tank 5 into the fourth water storage tank 4, the fourth water discharging mechanism is arranged at the bottom of the fourth water storage tank 4, the two fourth water storage tanks 4 are connected through the fourth water discharging mechanism, the fourth water storage tank 4 provides power for the fourth water discharging mechanism, and the fourth water discharging mechanism 4 is used for controlling the opening and closing of a water outlet on a standard layer of the next stage.

The fourth water outlet mechanism comprises a connecting rod, a pull shaft 4-8 and a fourth sealing plate 4-9, the two fourth water storage tanks are fixedly connected through the connecting rod, shaft holes 4-6 are formed in the connecting rod and the fifth water storage tank 5, one end of the pull shaft 4-8 penetrates through the pull rod and the shaft holes 4-6 in the fifth water storage tank to enter the first-stage standard layer part, one end of the pull shaft 4-8 is fixedly connected with a horizontal baffle, the other end of the pull shaft 4-8 is connected with the fourth sealing plate 4-9, and the fourth sealing plate 4-9 is arranged at the position of a water outlet 2-5 in the first-stage standard layer.

The fourth water discharging mechanism comprises a fourth floating shaft 4-4 and a fourth floating seal 4-7, a floating shaft hole 4-5 is formed in the middle of the fourth water storage tank, water discharging holes are formed in the periphery of the floating shaft hole 4-5, a plurality of water discharging holes are evenly distributed around the floating shaft hole 4-5, the fourth floating shaft 4-4 is arranged in the floating shaft hole 4-5, the fourth floating seal 4-7 is arranged at the bottom of the fourth floating shaft 4-4, and the fourth floating shaft 4-4 is matched with the fourth floating seal 4-7 and used for discharging water from the water discharging holes.

The four sides of the bottom of the fourth water storage tank 4 are provided with support legs, and the height of the fourth water storage tank is increased through the support legs, so that the fourth floating shaft 4-4 and the fourth floating seal 4-7 can move conveniently.

The upper part of the fourth water storage tank 4 is provided with a vent hole 4-2, and the vent hole 4-2 is convenient for water in the fourth water storage tank 4 to be discharged quickly through the water outlet.

When the water discharging device works, the fourth water storage tank 4 floats upwards along with the rising of the water amount in the fifth water storage tank 5, and the pull shaft 4-8 and the fourth sealing plate 4-9 move upwards along with the fourth water storage tank 4, so that the water outlet 2-5 of the standard layer component of the first stage is opened for water discharging; a fourth floating shaft 4-4 and a fourth floating seal 4-7 at the lower part of the fourth water storage tank 4 also move upwards, so that water drainage holes are formed in the periphery of the floating shaft hole 4-5; along with the rising of the water level in the fifth water storage tank 5, sewage enters the fourth water storage tank 4 through the water inlet pipe 4-3, the water level in the fourth water storage tank 4 reaches a certain height, and the fourth water storage tank 4 sinks, so that the fourth sealing plate 4-9 seals the water outlet 2-5 of the standard layer.

Along with the reduction of the water level in the fifth water storage tank 5, the fourth floating shaft 4-4 sinks, so that the water discharge hole is opened to discharge the water in the fourth water storage tank 4, which is lower than the water inlet pipe 4-3.

The third water storage tank 3 is arranged in the fifth water storage tank 5, the third tank 3 comprises a third water storage tank 3-1 and a third water outlet mechanism, the bottom of the third water storage tank 3-1 is provided with a third water outlet 3-6, the third water outlet 3-6 is communicated with the fifth water storage tank 5, the third water outlet mechanism is arranged above the third water outlet 3-6 and used for controlling the opening and closing of the third water outlet 3-6 and discharging sewage in the third water storage tank 3-1 completely.

The third water outlet mechanism comprises a third water dividing tank 3-2, the third water dividing tank 3-2 is fixedly connected with the third water storage tank 3 through a support leg, a through hole is formed in the middle of the bottom of the third water dividing tank 3-2, a third connecting rod 3-4 is arranged in the through hole, the third connecting rod 3-4 moves up and down in the through hole, a third sealing plate 3-5 is fixedly connected to one end 3-4 of the third connecting rod, the third sealing plate 3-5 is arranged above a third water outlet 3-6, and a third floater 3-3 is fixedly connected to the other end of the third connecting rod 3-4. When the water outlet device works, when the third float 3-3 bears buoyancy larger than the load of the third float, the third float 3-3 drives the third connecting rod 3-4 and the third sealing plate 3-5 to move upwards, so that the third water outlet 3-6 is opened.

The bottom of the third water dividing tank 3-2 is provided with a track hole, the outer side of the track hole is uniformly provided with third water discharge ports 3-8, the inner side of the track hole is provided with a third water discharge mechanism for controlling the opening and closing of the third water discharge ports 3-8, and sewage of the third water dividing tank 3-2 flows into the third water storage tank 3 by controlling the third water discharge ports 3-8.

The third water discharging mechanism comprises a third floating shaft 3-9 and a third floating seal 3-7, the third floating shaft 3-9 is arranged in the track hole, and one end of the third floating shaft 3-9 is fixedly connected with the third floating seal 3-7.

When the water-saving device works, sewage overflows into the third water storage tank 3 along with the rising of the water level in the fifth water storage tank 5, and floats upwards the third floating seal 3-7 to plug the third water outlet 3-8 along with the gradual rising of the water level in the third water storage tank; along with the rising of the water level in the third water storage tank 3-1, sewage enters the tank body from the upper part of the third sub-water tank 3-2, the third float 3-3 floats upwards to open the third water outlet 3-6, and the fifth water storage tank 5 is communicated with the third water storage tank 3.

When water is discharged, the sewage in the fifth water storage tank 5 and the third water storage tank 3 gradually descends, when the water level of the sewage in the third water storage tank 3 is lower than that of the third floating seal 3-7, the third floating seal 3-7 sinks to open the third water discharge outlet 3-8, the water level of the third sub water storage tank 3-2 gradually descends, and the third floating seal 3-3 descends to close the third water discharge outlet 3-6.

Standard layer part from the top down arranges in proper order, and the overlap joint each other, be equipped with the fungus bed in the standard layer part, the fourth box subassembly control of intaking between every layer of standard layer part by the one deck standard layer part, the upper water tank part makes sewage intermittent type nature pass through the fungus bed, the fungus bed is biological fungus's substitution, a COD for reducing in the sewage, BOD, ammonia nitrogen and total nitrogen index, utilize the compound oxygen cycle of water buoyancy control, can be accurate, the quick regulation compound oxygen cycle, further improvement deoxidation dephosphorization efficiency. The connecting structure between the adjacent standard layer components and the installation mode of the fungus bed are not limited, and the traditional structure in the mechanical field is adopted, so that the supporting and fixing functions can be realized.

In the work, sewage in the regulating reservoir enters an upper water tank of the potential energy biological sewage purifier, automatic repeated A/O of multi-standard layer parts is realized by means of potential energy, COD, BOD, ammonia nitrogen and total nitrogen indexes in the sewage are rapidly reduced, and phosphorus removal is synchronously realized.

The sewage treatment method for treating sewage by adopting the sewage treatment system comprises the following steps:

The invention has the characteristics of good effluent index and low power consumption, large-particle undegraded organic matters in the sewage are initially intercepted by a grating, then low-density substances float to the water surface by using oil separation precipitation, high-density substances are settled at the bottom of a tank, supernatant fluid flows into a microfiltration device to remove impurities such as micro-particles which cannot be removed in an oil separation sedimentation tank, then micron-grade filtration is carried out by double micro-generators to remove fine impurities and carry out anaerobic treatment, denitrification dephosphorization is realized by biochemical reaction in a denitrification tank, potential energy biological sewage purifier reduces COD, BOD, ammonia nitrogen and total nitrogen indexes in the sewage, the sewage flows into a second-stage microfiltration device after passing through a purification tank, and the sewage is discharged after being filtered, disinfected and precipitated.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.

If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the use of "first" and "second" is merely for convenience in describing the invention and to simplify the description, and unless otherwise stated the above words are not intended to have a special meaning.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides an energy-efficient sewage treatment system which characterized in that: the device comprises a pre-filtering system, a first-stage microfiltration device, a double-micro generator, a denitrification tank, a regulating tank, a potential energy biological sewage purifier, a denitrification reflux system, a second-stage microfiltration device, a sludge recycling system and a disinfection sedimentation tank which are sequentially arranged along the flowing direction of sewage;

2. The sewage treatment system of claim 1, wherein the pre-filtering system comprises a grid and an oil separation sedimentation tank, a water outlet of the grid is communicated with the oil separation sedimentation tank, an outlet of the oil separation sedimentation tank is communicated with the microfiltration equipment of the first stage, the grid primarily intercepts large-particle undegraded organic matters of sewage, the intercepted sewage flows into the oil separation sedimentation tank, low-density substances float on the water surface in the oil separation sedimentation tank, high-density substances settle at the bottom of the tank, and supernatant flows into the microfiltration equipment of the first stage through the outlet;

3. The sewage treatment system of claim 2, wherein the denitrification return system comprises a purification tank, one end of the purification tank is communicated with the potential energy biological sewage purifier, the other end of the purification tank is communicated with the second-stage microfiltration equipment, a water outlet pump is arranged in the purification tank and connected with the denitrification tank, and the denitrification tank is returned in a necessary proportion by adjusting the flow of the water outlet pump according to the detection index of the water quality condition;

4. The sewage treatment system of claim 3, wherein the water purification micro-filtration device comprises a water storage tank, the water storage tank is provided with a first water inlet and a first water outlet, a filter screen unit is arranged in the water storage tank, a bottom plate is fixedly connected to the lower portion of the water storage tank, a through hole is formed in the bottom plate, the filter screen unit is arranged at the periphery of the through hole, a bottom plate water outlet is formed in the side portion of the bottom plate, the bottom plate water outlet is communicated with the first water outlet, and a cleaning mechanism is arranged in the filter screen unit.

5. The sewage treatment system of claim 4, wherein the upper part of the bottom plate is provided with a water discharge opening, the water discharge opening is positioned outside the filter screen unit, the side part of the water storage tank is provided with a second water outlet, the side part of the bottom plate is provided with a sewage opening, the sewage opening is communicated with the second water outlet, and the water discharge opening is provided with a water discharge mechanism;

the range of the filter screen is 800-1200 meshes.

6. The sewage treatment system of claim 5, wherein the cleaning mechanism comprises a first mounting pipe and a second mounting pipe, the first mounting pipe is arranged at the upper part of the frame, the second mounting pipe is arranged at the lower part of the frame, the first mounting pipe and the second mounting pipe are arranged in the same plane, a spray pipe is rotatably connected between the first mounting pipe and the second mounting pipe, the length of the spray pipe is matched with the height of the filter screen, a plurality of spray heads are arranged on the spray pipe, the spray heads are uniformly arranged on the spray pipe, a water flow pipe is fixedly connected at the upper part of the spray pipe, and the water flow pipe is connected with a second high-pressure water pump;

the water drainage mechanism comprises a water storage plate, the lower part of the water storage plate is fixedly connected with a water storage bin, the bottom of the water storage bin is provided with a drainage pipe and a flow inlet pipe, the diameter of the drainage pipe is smaller than that of the flow inlet pipe, the flow inlet pipe is connected with a first high-pressure water pump, the upper part of the water storage plate is provided with a water bag, guide columns are respectively arranged on two sides of the water storage plate in a penetrating manner, one end of each guide column is fixedly connected with a first sealing plate, the other end of each guide column is fixedly connected with a second sealing plate, the first sealing plate is arranged above the water drainage opening, and the water storage plate is fixedly connected with the bottom plate through a stand column;

7. The sewage treatment system of claim 2, wherein the potential energy biological sewage purifier comprises a water feeding tank component and a standard layer component, a bacterial bed is arranged in the standard layer component, the water feeding tank component comprises a fifth water storage tank, a first water storage tank is arranged at the upper part of the fifth water storage tank, the fifth water storage tank is communicated with the first water storage tank, the first water storage tank is communicated with the second tank body component through a first tank body water discharging mechanism, the fifth water storage tank is communicated with the standard layer component through a second tank body component, a fourth tank body component is arranged at the bottom of the fifth water storage tank, and a fourth tank body component is arranged in the standard layer component at the upper stage between the adjacent standard layers.

8. The sewage treatment system of claim 7, wherein the first tank body water discharging mechanism comprises a communicating pipe and a first floating shaft, a first sealing ball is arranged at one end of the first floating shaft, a floating body is arranged at the other end of the first floating shaft, a first water inlet is arranged at one end of the communicating pipe, a through hole is arranged at the other end of the communicating pipe, the first floating shaft respectively passes through the first water inlet at one end of the communicating pipe and the through hole at the other end of the communicating pipe, and the first sealing ball is positioned above the first water inlet;

the fourth water outlet mechanism comprises a connecting rod, a pull shaft and a fourth sealing plate, the two fourth water storage tanks are fixedly connected through the connecting rod, one end of the pull shaft penetrates through the connecting rod to enter the standard layer, the end part of the pull shaft is fixedly connected with the fourth sealing plate, and the fourth sealing plate is arranged at the position of a water outlet on the standard layer;

the bottom of the fourth water storage tank is provided with supporting legs.

9. The sewage treatment system of claim 8, wherein a third tank is arranged in the fifth water storage tank, the third tank comprises a third water storage tank and a third water outlet mechanism, a third water outlet is arranged at the bottom of the third water storage tank, the third water outlet is communicated with the fifth water storage tank, the third water outlet mechanism is arranged above the third water outlet, the third water outlet mechanism comprises a third water dividing tank, the third water dividing tank and the third water storage tank are fixedly connected through a support leg, a through hole is arranged in the middle of the bottom of the third water dividing tank, a third connecting rod is arranged in the through hole, a third sealing plate is fixedly connected to one end of the third connecting rod, and a third float is fixedly connected to the other end of the third connecting rod;

10. A method for treating sewage by using the sewage treatment system according to any one of claims 3 to 9, comprising the steps of: