CN111135718B

CN111135718B - Sewage filtering device and filtering method

Info

Publication number: CN111135718B
Application number: CN201910330815.9A
Authority: CN
Inventors: 刘开琪; 孙广超; 刘永启; 叶根喜; 熊瑞; 陈运法
Original assignee: Nanjing Bilan Environmental Technology Co ltd; Institute of Process Engineering of CAS
Current assignee: Nanjing Bilan Environmental Technology Co ltd; Institute of Process Engineering of CAS
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2021-05-25
Anticipated expiration: 2039-04-23
Also published as: CN111135718A

Abstract

The invention relates to the technical field of filtration, and discloses a sewage filtering device and a filtering method, wherein the sewage filtering device comprises a clear liquid chamber for placing purified water formed after filtration, and the sewage filtering device also comprises: the filter units are arranged in parallel; the sewage inlet of each filtering unit is provided with a water inlet valve; and the water outlet valve is arranged at the water purification outlet of each filtering unit so as to communicate the water purification outlet with the clear liquid chamber. According to the invention, by arranging the plurality of filtering units which are arranged in parallel, the number of the filtering units for executing the filtering operation can be selected according to the requirement, the sewage filtering capacity is strong, and the occupied area is small. And when the filter unit needs to wash, can close the inlet valve and the outlet valve that correspond with this filter unit, wash this filter unit, filter sewage through other filter unit simultaneously, realize the filterable continuity of operation of sewage to improve sewage purification efficiency, reduced the running cost.

Description

Sewage filtering device and filtering method

Technical Field

The invention relates to the technical field of filtration, in particular to a sewage filtering device and a filtering method.

Background

During the processes of mineral resource collection, screening, transportation, application and the like, a large amount of sewage is generated, such as washing wastewater, coal washing sewage and the like of a conveying corridor of a coal preparation plant, the water quantity of the sewage is large, the pollution is serious, and meanwhile, the sewage contains high-content suspended matters, so that if the sewage is directly discharged, the natural environment is polluted, and the mineral resources are wasted. Therefore, it is very important to effectively treat and purify mine sewage.

At present, the treatment process of mine sewage mainly comprises the following steps: coagulation, clarification or sedimentation, filtration and disinfection. But the sewage containing silt is very stable, the natural settling period is longer, and the treatment effect is poorer. Various sedimentation tanks used in the conventional process have the problems of large occupied area, high civil engineering cost, incapability of meeting the standard of direct reuse of sewage treatment, discharge standard and the like.

In order to solve the above technical problems, a ceramic membrane filtration technology is generally used for filtering sewage in the prior art, and although the ceramic membrane has the advantages of high temperature resistance, high mechanical strength, good chemical stability, acid and alkali resistance, high efficiency in removing turbidity and the like, the ceramic membrane is widely applied to industrial sewage treatment. However, as the filtering time is prolonged, part of fine particle suspended matters can be attached to the outer surface of the ceramic membrane to form a filter cake layer, so that the membrane resistance is increased, and the membrane flux is reduced. Therefore, the ceramic membrane needs to be washed regularly, and the normal filtering process of sewage is influenced by washing the ceramic membrane, so that the filtering efficiency is reduced, and the operation cost is increased.

Therefore, there is a need for a sewage filtering apparatus and a filtering method to solve the above problems.

Disclosure of Invention

The invention aims to provide a sewage filtering device and a filtering method, which can realize continuous operation of sewage filtering so as to improve the sewage purification efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme:

a sewage filtering apparatus includes a clear liquid chamber for placing purified water formed after filtering, and further includes:

a plurality of filter units arranged in parallel;

the sewage inlet of each filtering unit is provided with the water inlet valve;

and the water outlet valve is arranged at the water purification outlet of each filtering unit so as to communicate the water purification outlet with the clear liquid chamber.

As an optimal technical scheme of the sewage filtering device, each sewage inlet is provided with a first pressure detection unit, and each purified water outlet is provided with a second pressure detection unit.

As a preferable technical scheme of the above sewage filtering apparatus, the sewage filtering apparatus further comprises a filtering chamber divided into a plurality of filtering chambers, and each filtering unit comprises one filtering chamber, a plurality of filtering pipes arranged in the filtering chamber, and a water inlet branch pipe;

one end of each water inlet branch pipe is communicated with the corresponding sewage inlet, and the other end of each water inlet branch pipe extends into the corresponding filtering cavity; the sewage end of each filter pipe is arranged in the filter cavity, and the water purification end of each filter pipe is communicated with the corresponding water purification outlet;

be equipped with a plurality of flushing holes on the water inlet branch pipe, water inlet branch pipe is configured as by the rivers that the flushing hole flows out can drive water inlet branch pipe is rotatory.

As a preferable technical solution of the above sewage filtering apparatus, a plurality of the filtering pipes of each of the filtering units are circumferentially distributed along the water inlet branch pipe.

As a preferable technical solution of the above sewage filtering apparatus, the filtering pipe includes a ceramic membrane filtering pipe.

As a preferable technical solution of the above sewage filtering apparatus, the sewage filtering apparatus further comprises a mechanical brush assembly, wherein the mechanical brush assembly comprises a cleaning brush for cleaning suspended matters attached to the peripheral wall of each of the filtering pipes, and a lifting unit capable of driving the cleaning brush to move up and down.

As a preferred technical scheme of above-mentioned sewage filter equipment, still include blowdown subassembly, the blowdown subassembly includes:

the filter chamber is arranged below the filter chamber and communicated with the filter chamber through a sewage draining outlet, and each filter chamber is communicated with the slag settling chamber through at least one sewage draining outlet;

and each sewage draining outlet is provided with one sewage draining valve.

As an optimal technical scheme of the sewage filtering device, the sewage filtering device further comprises a sewage booster pump, and an outlet of the sewage booster pump is communicated with the corresponding sewage inlet through the water inlet valve.

As a preferable technical scheme of the above sewage filtering apparatus, the apparatus further comprises a backwashing assembly, and the backwashing assembly comprises:

each filtering unit is provided with a back washing port communicated with the water purifying end of the filtering pipe, and the back washing port of each filtering unit is communicated with the back washing pipeline;

each back washing port is provided with the back washing valve;

and a water inlet of the backwashing booster pump is communicated with the clear liquid chamber, and a water outlet of the backwashing booster pump is communicated with the backwashing pipeline.

As an optimal technical scheme of the sewage filtering device, the sewage filtering device further comprises a dosing assembly, wherein the dosing assembly comprises a dosing cavity and a dosing valve, the dosing cavity is used for containing a medicament and is communicated with the backwashing pipeline, and the dosing valve is arranged on a pipeline which is communicated with the dosing cavity and the backwashing pipeline.

The invention also provides a sewage filtering method which is applied to the sewage filtering device, and in the sewage filtering process, the water inlet valve and the water outlet valve of at least one filtering unit are always in an open state so as to filter sewage.

As a preferred technical solution of the above sewage filtering method, when the pressure difference between the sewage inlet and the purified water outlet of the filtering unit exceeds a preset pressure difference, the water inlet valve and the water outlet valve of the filtering unit are closed, and the suspended matter attached to the outer peripheral wall of the filtering pipe of the filtering unit is cleaned by using the corresponding mechanical brush assembly;

and opening the corresponding backwashing valve, conveying the purified water in the clear liquid chamber into the filter pipe through the backwashing booster pump, and backwashing the filter unit.

The invention has the beneficial effects that: according to the invention, by arranging the plurality of filtering units which are arranged in parallel, the number of the filtering units for executing the filtering operation can be selected according to the requirement, the sewage filtering capacity is strong, and the occupied area is small. And when the filter unit needs to wash, can close the inlet valve and the outlet valve that correspond with this filter unit, wash this filter unit, filter sewage through other filter unit simultaneously, realize the filterable continuity of operation of sewage to improve sewage purification efficiency, reduced the running cost.

The invention also provides a sewage filtering method, which can realize that the water inlet valve and the water outlet valve of at least one filtering unit are always in an open state to filter sewage in the sewage filtering process. When one or more filter units need to be cleaned, other filter units can be used for filtering, and the filter units do not interfere with each other, so that continuous operation of sewage filtration is realized, and the sewage purification efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a sewage filtering apparatus provided in an embodiment of the present invention;

fig. 2 is a horizontal sectional view of one of the filter units shown in fig. 1.

In the figure:

1. a clear liquid chamber; 2. a filtering chamber; 3. a slag settling chamber; 4. a purified water main outlet; 5. a medicine adding cavity; 6. backwashing the booster pump; 7. a back-flushing valve; 8. a water outlet valve; 9. sealing the fixed plate; 10. a filter chamber; 11. a filter tube; 12. cleaning brushes; 13. a water inlet branch pipe; 14. a sewage main inlet; 15. a blowdown valve; 16. a main sewage discharge port; 17. a support frame; 18. a water inlet valve.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

Fig. 1 is a schematic structural diagram of a sewage filtering apparatus provided in this embodiment, and as shown in fig. 1, the sewage filtering apparatus provided in this embodiment is used for filtering industrial sewage, reducing solid substances contained in the industrial sewage, and simultaneously implementing continuous operation of sewage filtering to improve sewage purification efficiency.

The sewage filtering device comprises a clear liquid chamber 1, a plurality of filtering units, a water inlet valve 18 and a water outlet valve 8, wherein the clear liquid chamber 1 is used for placing purified water formed after filtering by the filtering units; the filtering units are used for filtering sewage to filter out solid substances contained in the sewage, the filtering units are arranged in parallel, a sewage inlet of each filtering unit is provided with a water inlet valve 18, a purified water outlet of each filtering unit is provided with a water outlet valve 8, and the purified water outlet of the corresponding filtering unit is controlled to be communicated or disconnected with the clear liquid chamber 1 through the water outlet valve 8.

Through setting up the filter unit of a plurality of parallelly connected settings, can select the number of the filter unit who carries out filtering operation according to the demand, sewage filtering capacity is strong, and area is little. And when one or more of the filter units need to be cleaned, the water inlet valve 18 and the water outlet valve 8 corresponding to the filter unit can be closed to clean the filter unit, and simultaneously, sewage is filtered through other filter units, so that continuous operation of sewage filtration is realized, the sewage purification efficiency is improved, and the operation cost is reduced.

The sewage filtering device also comprises a filtering chamber 2, wherein the filtering chamber 2 is divided into a plurality of filtering cavities 10, and each filtering unit comprises one filtering cavity 10, a water inlet branch pipe 13 and a plurality of filtering pipes 11. The sewage filter device that this embodiment provided is a malleation device, and clear liquid chamber 1's below is located to filter chamber 2, and this sewage filter device still includes sewage booster pump (not shown in the figure), and the export of sewage booster pump passes through inlet valve 18 and the sewage entry intercommunication that corresponds, sends external sewage into in filter chamber 2 through sewage booster pump and filters. Specifically, be equipped with into water and be responsible for in filter chamber 2, be equipped with the sewage total entrance 14 with the export intercommunication of sewage booster pump in the person in charge of intaking, the person in charge of intaking is laid horizontally, and it passes every filter chamber 10 in proper order, is equipped with a plurality of sewage inlets in the person in charge of intaking, every filter chamber 10 corresponds a sewage inlet at least, the branch pipe 13 of intaking in every filter chamber 10 all is responsible for the intercommunication with intaking through the sewage inlet that corresponds, through adjusting the intercommunication or the disconnection that intake valve 18 made the branch pipe 13 of intaking in every filter chamber 10 and intake be responsible for. It should be noted that the water inlet main pipe is not limited to be horizontally arranged, and may be obliquely arranged. The number of the water inlet branch pipes 13 in each filter chamber 10 is not limited to one, and may be plural.

The sewage end of each filter pipe 11 is arranged in the filter cavity 10, and the water purification end of each filter pipe is communicated with the corresponding water purification outlet; the water inlet branch pipe 13 is provided with a plurality of flushing holes. In sewage was responsible for through intaking and is got into water branch pipe 13, in injecting into filter chamber 10 through the wash port on the branch pipe 13 of intaking, sewage in the filter chamber 10 filtered the suspended solid in the sewage through the micropore on the filter tube 11, and the suspended solid is detained in filter chamber 10, and water gets into in the filter tube 11 through the micropore on the filter tube 11 to export the clear water that gets into clear liquid chamber 1 through the water purification that corresponds and form the water purification. The clear liquid chamber 1 is provided with a purified water main outlet 4, and the purified water in the clear liquid chamber 1 can be discharged through the purified water main outlet 4. The filter tube 11 in this embodiment is preferably, but not exclusively, a ceramic membrane filter tube which is an asymmetric ceramic tube using a silicon carbide support and coated with a corundum-based microfiltration membrane. The ceramic membrane filter tube has good strength and porosity, and has the advantages of high strength, corrosion resistance, high temperature resistance, good regeneration performance and the like, and the service life is usually longer than 3 years. In the service cycle, when the regeneration performance of the ceramic membrane filter tube is deteriorated,the ceramic membrane filter tube can also be taken down for high-temperature firing, so that the filtering regeneration performance of the ceramic membrane filter tube is further improved, and the service life is prolonged. In the embodiment, the ceramic membrane filter tube has the length of 500mm-2000mm, the inner diameter of 40mm-100mm and the filtering precision of 0.1 μm-3 μm. In the sewage filtering device formed by connecting a plurality of filtering units in parallel in the embodiment, the number of the filtering pipes 11 reaches 50-1000, and the average sewage treatment capacity is 4500-²h。

Further, every filter chamber 10 all is equipped with the manhole, and the detachable access panel is installed to the manhole, when needs examine and repair the structure of filter chamber 10 inside, can dismantle the access panel, makes things convenient for the maintenance personal to get into inside examining and repairing and changing filter tube 11 of filter chamber 10 through the manhole.

Clear water chamber 1 and filter chamber 2 keep apart through sealed fixed plate 9, be equipped with in the sealed fixed plate 9 with filter chamber 10 one-to-one assemble the chamber (not shown in the figure), filter chamber 10 is all arranged in to the sewage end of every filter tube 11, sealed fixed plate 9's diapire is equipped with the mounting hole with a plurality of filter tube 11 one-to-one, the water purification end of every filter tube 11 stretches into in the mounting hole that corresponds and with mounting hole sealing connection, in order to send into the water purification in the filter tube 11 and assemble the intracavity, the upper surface of sealed fixed plate 9 is located to the water purification export, water outlet valve 8 locates the water purification export, assemble in the interior water purification of intracavity get into clear water chamber 1 through corresponding water purification export.

Further, water inlet branch pipe 13 is configured such that a flow of water flowing out of the flush hole can drive water inlet branch pipe 13 to rotate. Specifically, since the sewage filtering apparatus provided in this embodiment is a positive pressure apparatus, the sewage is supplied to the water inlet branch pipe 13 by the sewage pressurizing pump, and preferably, the water pressure supplied by the sewage pressurizing pump is about 0.2 Mpa. Under the prerequisite that intake branch pipe 13 can be responsible for the rotation for intaking, a plurality of flushing holes are divided into the multiunit, multiunit flushing hole is along intake branch pipe 13 axial distribution, every group flushing hole includes a plurality of flushing holes, a plurality of flushing holes of every group distribute along intake branch pipe 13 circumference, the axis of every flushing hole is crossing with intake branch pipe 13's the central axis space, the distance between the central axis of every flushing hole to the central axis of intake branch pipe 13 is crescent from bottom to top, the horizontal cross-section of every flushing hole is oval. The wash port of arranging according to above-mentioned mode, water in the branch pipe 13 of intaking flows out the back through the wash port, there is a reverse effort to drive branch pipe 13 high-speed rotatory of intaking, and the high-pressure rivers that jet out from the wash port will wash the periphery wall that encircles a plurality of filter tubes 11 that branch pipe 13 set up of intaking, make the suspended solid be difficult for adhering to on the 11 periphery walls of filter tubes, thereby slow down 11 pollution velocity of filter tubes, the filter capacity of filter tubes 11 has been increased, the cleaning frequency of filter tubes 11 has been reduced, the life of filter tubes 11 has been prolonged, the running cost is reduced. It should be noted that the distribution pattern of the flushing holes is not limited to the above pattern, and a plurality of flushing holes may be spirally distributed.

When the mode is adopted for filtration, water entering the filter pipe 11 forms purified water and is pushed into the clear liquid chamber 1 under the action of pressure difference, suspended matters such as coal slime particles and oil stains are intercepted on the outer surface of the filter pipe 11 and are continuously concentrated, and the suspended matters are gradually settled at the bottom of the filter chamber 10 under the action of gravity. The content of suspended substances in the filtered purified water is 1mg/L-10mg/L, the content of the suspended substances in the sewage sent into the filtering unit is 100mg/L-800mg/L, the removal rate reaches more than 98 percent, the oil removal rate is 50 percent-90 percent, the purified water can be directly recycled or discharged, the resource waste and the environmental pollution are avoided, and the operation cost is reduced.

Further, every sewage entry all is equipped with first pressure measurement unit, and every water purification export all is equipped with second pressure measurement unit. With the extension of the filtering time, the suspended matters are continuously attached to the surface of the filtering pipe 11 to form a filter cake layer, so that the filtering resistance is increased, the filtering capacity of the filtering pipe 11 is reduced, and the pressure difference between the sewage inlet and the purified water outlet of the filtering unit is continuously increased, so that whether the filtering pipe 11 of the filtering unit needs to be cleaned or not can be determined by judging whether the pressure difference between the sewage inlet and the purified water outlet of the filtering unit exceeds the preset pressure difference or not. Preferably, the first pressure detection unit and the second pressure detection unit both use pressure sensors, and both pressure sensors are connected to a controller (not shown in the figure) of the sewage filtering device.

In order to facilitate cleaning of the filter tubes 11 of the filter unit, the sewage filtering apparatus provided in this embodiment further includes a mechanical brush assembly including a cleaning brush 12 for cleaning suspended matters attached to the outer circumferential wall of each filter tube 11, and a lifting unit capable of driving the cleaning brush 12 to move up and down. The mechanical brush components and the filtering units are arranged in one-to-one correspondence. Fig. 2 is a horizontal sectional view of fig. 1, and as shown in fig. 2, in this embodiment, a water inlet branch pipe 13 and six filter pipes 11 are arranged in each filter chamber 10, and the six filter pipes 11 are uniformly distributed along the circumferential direction of the water inlet branch pipe 13. In order to further improve the cleaning capacity of the mechanical brush assembly, one cleaning brush 12 is sleeved on the peripheral wall of each filtering pipe 11, and the six cleaning brushes 12 of each filtering unit are driven by the same lifting unit to synchronously move up and down. In the present embodiment, the distance in which the cleaning brush 12 moves up and down is related to the length of the filter tube 11, and it is preferable that the distance in which the cleaning brush 12 moves up and down is slightly smaller than the length of the filter tube 11, so that the cleaning brush 12 does not come off the filter tube 11, and the entire outer peripheral wall of the filter tube 11 is mechanically brushed by the entire tube by the cleaning brush 12 assembly as much as possible, and suspended matters adhering to the outer peripheral wall of the filter tube 11 are removed.

Further, the washing brush 12 is preferably made of nylon wire, and is fine, soft, wear-resistant, and elastic, and does not damage the filter tube 11 during brushing.

Because a small amount of suspended matters are attached to the inner wall of the pore passage of the filter pipe 11 during the filtering process, the mechanical brush assembly can only clean the suspended matters attached to the outer wall of the filter pipe 11. Therefore, the sewage filtering device provided by the embodiment further comprises a backwashing component, wherein the backwashing component comprises a backwashing pipeline, backwashing valves 7 and a backwashing booster pump 6, the backwashing pipeline is provided with branch ports which correspond to the convergence cavities one by one, a backwashing port is arranged on the sealing and fixing plate 9 and is communicated with the corresponding branch port, and each backwashing port is provided with one backwashing valve 7; the back washing pipeline is communicated with an outlet of the back washing booster pump 6, and an inlet of the back washing booster pump 6 is communicated with the clear liquid chamber 1. When any one filtering unit needs to be cleaned, the corresponding back washing valve 7 can be opened, the corresponding water inlet valve 18 and the corresponding water outlet valve 8 are closed, and the plurality of filtering pipes 11 of the filtering unit are back washed by using the purified water in the clear water chamber 1, so that suspended matters attached to the inner walls of the pore passages of the filtering pipes 11 can be removed, and the suspended matters blocked on the micropores of the filtering pipes 11 can be washed away. It is particularly emphasized that the backwash booster pump 6 may also be provided outside the clear liquid chamber 1, with the filter unit being backwashed by introducing clean water or other clear water discharged from the clear liquid chamber 1 from the outside.

Most of the suspension that fails to pass through the filter pipe 11 will gradually sink to the bottom of the filter chamber 10, and the main inlet pipe is located at a distance from the bottom of the filter chamber 10 so that the main inlet pipe is not submerged by the suspension that has settled to the bottom of the filter chamber 10. The sewage filtering device provided by the embodiment further comprises a sewage discharging assembly, and the sewage discharging assembly comprises a sediment chamber 3 and a sewage discharging valve 15. Wherein, set up sediment room 3 in the below of filter chamber 2, sediment room 3 separates through the baffle with filter chamber 2, is equipped with a plurality of drain on the baffle, and every filter chamber 10 communicates with sediment room 3 through at least one drain, and every drain all is equipped with blowdown valve 15. When the suspended matters deposited in the filter cavity 10 need to be cleaned, the corresponding water inlet valve 18, the corresponding water outlet valve 8 and the corresponding back flush valve 7 are closed, the corresponding sewage discharge valve 15 is opened at the same time, and the suspended matters deposited at the bottom of the filter cavity 10 can enter the lower sediment chamber 3 through the sewage discharge outlet under the action of the self gravity. During the back flushing process, the sewage discharge valve 15 corresponding to the filtering unit for back flushing is in an open state, so that sewage generated by back flushing can be discharged in time.

Furthermore, a sewage discharge main port 16 is arranged on the bottom wall of the slag settling chamber 3, the sewage discharge main port 16 is communicated with an inlet of the filter press, suspended matters entering the slag settling chamber 3 are discharged through the sewage discharge main port 16 and are sent into the filter press to be pressed into a filter cake, and the obtained filter cake can be recycled according to components of the filter cake; the filtrate of the filter press is reintroduced into the filtration unit through the booster pump for secondary filtration.

In order to further improve the cleaning effect of the filter tube 11, the sewage filtering apparatus provided by the embodiment further comprises a dosing assembly, wherein the dosing assembly comprises a dosing cavity 5 used for containing a medicament and communicated with the backwashing pipeline, and a dosing valve arranged on a pipeline communicating the dosing cavity 5 with the backwashing pipeline. Specifically, a medicament outlet of the medicament adding cavity 5 is communicated with an inlet of the backwashing booster pump 6, the medicament adding valve is arranged at the medicament outlet, if the medicament adding valve is opened in the backwashing process, the backwashing booster pump 6 simultaneously sends purified water and the medicament in the medicament adding cavity 5 into a backwashing pipeline, the medicament enters the filter pipe 11 through the backwashing pipeline, and the medicament chemically reacts with suspended matters attached to the filter pipe 11 and suspended matters attached to the inner wall of the filter cavity 10 and difficult to remove, so that the cleaning effect is enhanced. The type of the agent is determined according to the type of the suspended matter so that the agent can chemically react with the suspended matter to remove the suspended matter attached to the inner wall or the outer peripheral wall of the filter tube 11. It can be understood that a dosing pump can also be separately provided for the dosing cavity 5, and during the back flushing process, the dosing pump feeds the medicament in the dosing cavity 5 into the back flushing pipeline, but the operation cost is increased compared with the common back flushing booster pump 6.

Further, in the present embodiment, the clear liquid chamber 1, the filter chamber 2 and the sediment chamber 3 form a vertical tubular housing, and the housing is formed by welding stainless steel. The bottom of the sediment chamber 3 is provided with a plurality of support frames 17 to support the shell and ensure the stability of the shell.

The embodiment also provides a sewage filtering method applied to the sewage filtering device, which specifically comprises the following steps:

s1, selecting the number of the filter units according to the filtering requirements, and opening the water inlet valve 18 and the water outlet valve 8 of the filter units to filter the sewage.

And S2, when the pressure difference between the sewage inlet and the clean water outlet of the filter unit exceeds the preset pressure difference, closing the water inlet valve 18 and the water outlet valve 8 of the filter unit.

To meet the filtration demand, the inlet valve 18 and the outlet valve 8 of a previously non-operating filtration unit are opened simultaneously. If all the filtering units are in the filtering process, the other filtering units can continue to work.

S3, the suspended matter adhered to the outer peripheral wall of the filter tube 11 of the filter unit is cleaned by using a corresponding mechanical brush assembly.

S4, opening the corresponding back washing valve 7 and the corresponding sewage discharge valve 15, sending the clean water in the clean water chamber 1 into the filter pipe 11 through the back washing booster pump 6, back washing the filter unit, sending the sewage generated by back washing into the sediment chamber 3 through the corresponding sewage discharge port, and discharging the sewage through the sewage discharge main port 16.

The pressure difference corresponding to the pressure difference in the normal filtering process is generally 0.1MPa-0.3MPa, and the pressure difference corresponding to the preset pressure difference is 0.3 MPa. Typically, 2-6 backflushing times are carried out within 24 hours, each time 5-10 backflushing times, and the flushing time lasts 1-5 minutes.

And determining whether a medicine adding unit is needed to add the medicine into the backwashing pipeline according to the requirement.

This embodiment brushes 11 peripheral wall adnexed suspended solids of filter tube through mechanical brush subassembly earlier, and the rethread back flush washes filter tube 11, has solved the poor problem of back flush effect, has increased substantially the regeneration efficiency and the life of filter tube 11.

In the above process, each filter unit needs to periodically open the corresponding sewage valve 15 to discharge the suspended matter deposited at the bottom of the filter chamber 10 into the slag settling chamber 3. The suspended matters sent into the slag settling chamber 3 can be pressed into filter cakes through a filter press, and the obtained filter cakes can be recycled according to the components of the filter cakes; the filtrate of the filter press is reintroduced into the filtration unit by the sewage booster pump for secondary filtration.

By adopting the method, the water inlet valve 18 and the water outlet valve 8 of at least one filtering unit are always in an open state to filter the sewage in the sewage filtering process. That is, when one or more filter units need to be cleaned, other filter units can be used for filtering, and the filter units do not interfere with each other, so that continuous operation of sewage filtration is realized, and the sewage purification efficiency is improved.

The suspended matter on the filter pipe 11 in this embodiment refers to sludge, colloid, oil stain, and the like. The water inlet valve 18, the water outlet valve 8, the sewage discharge valve 15, the back flush valve 7 and the dosing valve in the embodiment are all electromagnetic valves and are electrically connected to the controller, and the controller controls the state adjustment of the water inlet valve 18, the water outlet valve 8, the sewage discharge valve 15, the back flush valve 7 and the dosing valve. The backwashing booster pump 6, the sewage booster pump and the lifting unit are electrically connected to the controller to control the backwashing booster pump 6, the sewage booster pump and the lifting unit to work. In this embodiment, the controller may be a centralized or distributed controller, for example, the controller may be a single-chip microcomputer or may be composed of a plurality of distributed single-chip microcomputers, and the single-chip microcomputers may run a control program to control the state adjustment of the valves, such as the water inlet valve 18, the water outlet valve 8, the sewage discharge valve 15, the backwash valve 7, the dosing valve, and the like, and control the pressure sensor, the backwash booster pump 6, the sewage booster pump, and the lifting unit to implement their corresponding functions.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Claims

1. A sewage filtration method, characterized by being applied to a sewage filtration apparatus including a clear liquid chamber (1) for placing purified water formed after filtration, further comprising:

a plurality of filter units arranged in parallel;

the sewage inlet of each filtering unit is provided with the water inlet valve (18);

the water outlet valve (8) is arranged at the purified water outlet of each filtering unit, so that the purified water outlet is communicated with the clear liquid chamber (1);

a filtering chamber (2) divided into a plurality of filtering chambers (10), each filtering unit comprising one filtering chamber (10), a plurality of filtering pipes (11) arranged in the filtering chamber (10), and a water inlet branch pipe (13);

one end of each water inlet branch pipe (13) is communicated with the corresponding sewage inlet, and the other end of each water inlet branch pipe extends into the filter cavity (10); the sewage end of each filter pipe (11) is arranged in the filter cavity (10), and the water purification end of each filter pipe is communicated with the corresponding water purification outlet;

a plurality of flushing holes are formed in the water inlet branch pipe (13), and the water inlet branch pipe (13) is configured in such a way that the water flow flowing out of the flushing holes can drive the water inlet branch pipe (13) to rotate;

the device also comprises a mechanical brush assembly, wherein the mechanical brush assembly comprises a cleaning brush (12) for cleaning suspended matters attached to the peripheral wall of each filter pipe (11), and a lifting unit capable of driving the cleaning brush (12) to move up and down;

the sewage filtering method further comprises the following steps: in the sewage filtering process, at least one water inlet valve (18) and one water outlet valve (8) of the filtering unit are always in an open state to filter sewage.

2. The wastewater filtering method according to claim 1, wherein each of the wastewater inlets is provided with a first pressure detecting unit, and each of the purified water outlets is provided with a second pressure detecting unit.

3. The wastewater filtering method according to claim 1, characterized in that a plurality of said filtering pipes (11) of each said filtering unit are circumferentially distributed along said inlet branch pipe (13).

4. The wastewater filtration method according to claim 1, wherein the filtration tubes (11) comprise ceramic membrane filtration tubes.

5. The method of filtering wastewater of claim 1, wherein the wastewater filtering device further comprises a blowdown assembly comprising:

the sediment chambers (3) are arranged below the filtering chambers (2) and are communicated with the filtering chambers (2) through sewage outlets, and each filtering cavity (10) is communicated with the sediment chambers (3) through at least one sewage outlet;

and each sewage draining outlet is provided with one sewage draining valve (15).

6. The sewage filtering method according to claim 1, wherein said sewage filtering apparatus further comprises a sewage booster pump, an outlet of said sewage booster pump being communicated with a corresponding said sewage inlet through said water inlet valve (18).

7. The wastewater filtration method of claim 1, wherein the wastewater filtration apparatus further comprises a backwash assembly, the backwash assembly comprising:

each filtering unit is provided with a back flushing port communicated with the water purifying end of the filtering pipe (11), and the back flushing port of each filtering unit is communicated with the back flushing pipeline;

each backwashing port is provided with the backwashing valve (7);

the water inlet of the backwashing booster pump (6) is communicated with the clear liquid chamber (1), and the water outlet of the backwashing booster pump is communicated with the backwashing pipeline.

8. The sewage filtering method according to claim 7, wherein the sewage filtering apparatus further comprises a dosing assembly, the dosing assembly comprises a dosing cavity (5) for containing a medicament and communicating with the backwashing pipeline, and a dosing valve arranged on a pipeline communicating the dosing cavity (5) with the backwashing pipeline.

9. The wastewater filtering method according to claim 1, wherein when the pressure difference between the wastewater inlet and the purified water outlet of the filtering unit exceeds a predetermined pressure difference, the inlet valve (18) and the outlet valve (8) of the filtering unit are closed, and suspended matter attached to the outer peripheral wall of the filtering pipe (11) of the filtering unit is cleaned by using the corresponding mechanical brush assembly;

and (3) opening a corresponding back washing valve (7), and conveying the purified water in the clear liquid chamber (1) into a filter pipe (11) through a back washing booster pump (6) to carry out back washing on the filter unit.