CN212713017U - Organic waste liquid filtering device and organic waste liquid treatment and recovery system - Google Patents

Abstract

The utility model provides an organic waste liquid filter equipment and organic waste liquid treatment recovery system, wherein organic waste liquid filter equipment includes: a housing; the upper die is positioned in the shell and communicated with the conveying pipeline; the lower die is positioned in the shell and is opposite to the upper die, and the lower die is communicated with the liquid outlet pipeline; and an endless belt-type support screen disposed around the lower mold, wherein a portion of the support screen located at a side of the lower mold facing the upper mold is configured to attach a filter aid in the organic waste liquid to be filtered. The organic waste liquid filtering and recycling device can achieve one or more purposes of filtering, processing and recycling the organic waste liquid.

Description

Organic waste liquid filtering device and organic waste liquid treatment and recovery system

Technical Field

The utility model relates to an industrial sewage treatment technical field especially relates to an organic waste liquid filter equipment and organic waste liquid treatment recovery system.

Background

With the national emphasis on environmental protection, the sewage discharge further improves the standards and limits, and each industrial enterprise faces unprecedented pressure in the aspects of sewage treatment and discharge. Firstly, most of the existing production and sewage treatment devices are built according to old standard specifications, and after the sewage discharge is upgraded, the treatment capacity of the existing production and sewage treatment devices can not meet the discharge limit requirement of COD (Chemical Oxygen Demand, parameter for representing organic matter pollution of water body) far, so that enterprises consider the expansion of the sewage treatment devices on one hand and consider the source treatment of pollutants on the other hand. However, the large land required for the expansion of the sewage treatment plant is obviously a major bottleneck for the expansion of the sewage treatment plant in the enterprise. Therefore, many enterprises aim at the source treatment of pollutants.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides an organic waste liquid filtering device and an organic waste liquid treatment and recovery system, so as to realize one or more purposes of filtering, treating and recycling organic waste liquid.

In one aspect, some embodiments of the present disclosure provide an organic waste liquid filtering device, including: a housing; the upper die is positioned in the shell and communicated with the conveying pipeline; the lower die is positioned in the shell and is opposite to the upper die, and the lower die is communicated with the liquid outlet pipeline; and an endless belt-type support screen disposed around the lower mold, wherein a portion of the support screen located at a side of the lower mold facing the upper mold is configured to attach a filter aid in the organic waste liquid to be filtered.

In at least one embodiment of the present disclosure, the upper die is further connected to a hydraulic cylinder, the upper die being configured to move in a vertical direction under the drive of the hydraulic cylinder; the upper die can move downwards under the driving of the hydraulic cylinder to be matched with the lower die to form a matched die cavity.

In at least one embodiment of the present disclosure, the organic waste liquid filtering apparatus further includes: the water distributor is arranged in the upper die and is communicated with the conveying pipeline.

In at least one embodiment of the present disclosure, the organic waste liquid filtering apparatus further includes: a chain connected with the support filter screen; and the motor is connected with the chain and is configured to drive the chain to drive the support filter screen to rotate.

In at least one embodiment of the present disclosure, a sludge discharge port is provided at a lower portion of the housing, and the sludge discharge port is provided at a position corresponding to the revolving portion supporting the filter screen.

In another aspect, some embodiments of the present disclosure provide an organic waste liquid treatment and recovery system, including the organic waste liquid filtering device according to any of the above embodiments, the organic waste liquid treatment and recovery system further including: the liquid outlet of the mixing tank is connected with the organic waste liquid filtering device; and the stirrer is arranged in the mixing tank and is configured to uniformly mix the organic waste liquid to be treated in the mixing tank with the filter aid added into the organic waste liquid to be treated.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: and the control cabinet is connected with the stirrer.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: a hydraulic cylinder connected with the upper die and configured to drive the upper die to move in a vertical direction; the hydraulic cylinder is connected with the control cabinet.

In at least one embodiment of the present disclosure, the organic waste liquid filtering apparatus further includes a chain connected to the support screen, and a motor connected to the chain; the control cabinet is connected with the motor.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: and the waste liquid lifting pump is arranged between the organic waste liquid source to be treated and the mixing tank and is connected with the control cabinet.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: the liquid level sensor is arranged at the upper part of the tank body of the mixing tank; the liquid level sensor is connected with the control cabinet and is configured to detect the liquid level of liquid in the mixing tank and transmit a liquid level detection signal to the control cabinet; the control cabinet is configured to receive the liquid level detection signal, judges whether the liquid level of liquid in the mixing tank exceeds a preset liquid level, and if so, controls the waste liquid lift pump to be closed.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: a first dosing tank connected to the mixing tank; the first dosing pump is arranged between the first dosing tank and the mixing tank and is connected with the control cabinet; a second dosing tank connected to the mixing tank; and the second dosing pump is arranged between the second dosing tank and the mixing tank and is connected with the control cabinet.

In at least one embodiment of this disclosure, the liquid outlet of blending tank passes through pipeline with organic waste liquid filter equipment and communicates, and organic waste liquid handles recovery system still includes: the liquid supply pump is arranged on the conveying pipeline and is connected with the control cabinet; and the liquid supply valve is arranged on the conveying pipeline and is connected with the control cabinet.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: a pressure sensor connected with the upper die; the pressure sensor is connected with the control cabinet and is configured to detect the pressure in a die closing cavity formed when the upper die and the lower die are closed and transmit a pressure signal to the control cabinet; the control cabinet is also configured to receive the pressure signal, judge whether the pressure in the compound die cavity exceeds a first preset pressure, and if so, control the liquid supply pump and the liquid supply valve to close.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: a compressed air tank connected with the upper die; the compressed air valve is arranged between the compressed air tank and the upper die and is connected with the control cabinet; the pressure release valve is arranged between the upper die and the liquid outlet pipeline and is connected with the control cabinet; the control cabinet is also configured to receive the pressure signal, judge whether the pressure in the die closing cavity exceeds a first preset pressure, and if so, control the compressed air valve to open; and judging whether the pressure in the die closing cavity is lower than a second preset pressure or not, if so, controlling the compression air valve to be closed and controlling the pressure release valve to be opened.

In at least one embodiment of the present disclosure, the liquid outlet pipe includes a purification branch and a secondary filtration branch, the secondary filtration branch is connected with the mixing tank; the organic waste liquid treatment and recovery system further comprises: the water purifying tank is connected with the purifying branch and is connected with the ozone sterilization device; the water purifying valve is arranged on the purifying branch and is connected with the control cabinet; and the secondary filter valve is arranged on the secondary filter branch and is connected with the control cabinet.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram of an organic waste liquid filtration apparatus according to some embodiments;

FIG. 2 is a schematic diagram of a system for treating and recovering organic waste liquid according to some embodiments;

FIG. 3 is a schematic diagram of another organic waste stream treatment and recovery system according to some embodiments;

FIG. 4 is a plan view of the organic waste liquid treatment and recovery system shown in FIG. 3.

Reference numerals:

1-organic waste liquid filtering device, 101-shell, 102-upper die, 103-lower die, 104-supporting filter screen, 105-water distributor, 106-sludge discharge port, 2-mixing tank, 3-stirrer, 4-control cabinet, 5-hydraulic cylinder, 6-waste liquid lifting pump, 7-liquid level sensor, 8-first dosing tank, 9-first dosing pump, 10-second dosing tank, 11-second dosing pump, 12-liquid supply pump, 13-liquid supply valve, 14-pressure sensor, 15-compressed air tank, 16-compressed air valve, 17-pressure relief valve, 18-purified water tank, 19-purified water valve, 20-secondary filtering valve, 21-conveying pipeline, 22-liquid outlet pipeline, 221-purifying branch, 222-secondary filtering branch, 23-ozone sterilizing device.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As described in the background, many enterprises aim to address the source of pollutants. Organic pollutants in sewage discharge of general industrial enterprises are mainly generated in the working procedures of casting, machining, surface treatment and the like, most of the organic pollutants belong to oils, cleaning agents, synthetic organic solutions and the like, and the components of the substances are not chemically changed except for partial loss in the production process, but are only mixed with impurities; if the impurities can be removed in a targeted manner, the problem of source zero emission is solved, a large amount of raw material purchasing cost can be saved, and huge economic and social benefits are brought to enterprises.

The separation and filtration technology in the related technology is mature, the product application range is very wide, and the method covers a plurality of fields. Among them are represented by the following technologies or products: filters (filter screens, bag filters, sand filters, ultrafiltration, membrane filtration, and the like), and filter press equipment (plate and frame filter presses, belt filter presses, and the like).

The filter technology is mostly applied to the fields of sewage, tap water, pure water and the like, wherein the filter screen and the filter bag type filter realize the filtering precision depending on the size of pores of the fabric, and the filtering precision is large and low, so that the requirement cannot be met; the pores are small and easy to block, so that the equipment investment amount is increased if high filtering benefit is realized, the blocked consumables are difficult to clean, and secondary pollution is generated when the consumables are cleaned; in addition, because most of filter media are organic matters, filter products generally need to be treated again according to hazardous wastes, and the existing filter cannot realize the weight reduction problems of dehydration, drying and the like of the filtered solid products.

The filter pressing equipment is mainly applied to sludge drying treatment and has filtering property. According to the components of the waste liquid and the diameter of the particles, the filter cloth with different specifications can be selected. However, the adoption of the filter pressing equipment needs more pretreatment devices, manual cleaning is needed after slag discharge of the filter pressing machine, and the device size is only inferior to the reconstruction of a sewage treatment plant, so the scheme also has greater limitation.

Based on the above, some embodiments of the present disclosure provide an organic waste liquid filtering device, an organic waste liquid treatment and recovery system, and a method for treating and recovering organic waste liquid using the device and system, so as to achieve one or more of filtering, treating, and recovering and reusing of organic waste liquid.

As shown in fig. 1, some embodiments of the present disclosure provide an organic waste liquid filtering apparatus 1 including: the device comprises a shell 101, an upper die 102 positioned in the shell 101, a lower die 103 positioned in the shell 101 and opposite to the upper die 102, and an annular conveyer belt type support screen 104 arranged around the lower die 103.

The upper die 102 is communicated with the conveying pipeline 21, and the size of the die cavity of the upper die 102 can be selected according to the amount of the organic waste liquid to be treated. The lower die 103 is communicated with the liquid outlet pipeline 22.

The support filter screen 104 is made of Polyethylene (PE) or polyvinyl chloride (PVC), and the support filter screen 104 with 100-300 meshes, for example, a PE support filter screen with 160 meshes, can be selected according to the condition of the organic waste liquid to be filtered. Of the endless belt-type support screens 104, a portion of the support screen 104 on the side of the lower die 103 toward the upper die 102 is configured to attach a filter aid to be filtered in the organic waste liquid.

As an example, the filter aid may be selected from grass fibers having a length of about 200 to 300 μm and a diameter of about 25 to 30 μm, which are measured by a microscope at a magnification of 100 times, and a specific surface area of about 200 to 300m, in which the fibers are stacked to form a microporous structure²Kg, has the characteristic of good air permeability. Grass fibers are used as a filter aid and quantitatively added into organic waste liquid to be filtered, the organic waste liquid to be filtered and the filter aid are uniformly stirred and then are introduced into the organic waste liquid filtering device 1, the grass fibers can be intercepted by the supporting filter screen 104 and attached to the surface of the supporting filter screen 104 through the supporting filter screen 104 positioned between the upper die 102 and the lower die 103 to form a filter bed, the thickness of the filter bed is gradually increased along with the passage of filtering time, the sludge capacity is gradually increased, the filtering area is gradually increased, fine filtering of the organic waste liquid is realized by the filter bed, and the filtered liquid is discharged through a liquid outlet pipeline 22 communicated with the lower die 103 to realize subsequent recycling.

Through this organic waste liquid filter equipment 1 of embodiment of disclosure to mixing the filter aid of waiting to worry in the organic waste liquid and intercepting, changed single filter screen or filter bag among the correlation technique and carried out filterable structural style to organic waste liquid, from the microcosmic analysis, the filtering process is the characteristics of multistage high accuracy filtration, therefore filter fineness is high, and the liquid turbidity after the lower mould 103 export filtration is less than 5 mg/L. While the common filter screen in the related art can only filter larger mechanical particles, and the turbidity of the liquid filtered by the filter bag and the sand filter is minimum 15 mg/L.

Based on this, the organic waste liquid filtering device 1 provided by the present disclosure has a larger liquid production amount per unit time than other forms of filtering apparatuses; at the same flow rate, the filtration time is shorter. The volume of the organic waste liquid filtering equipment can be obviously reduced by combining the addition of the filter aid with the organic waste liquid filtering device 1; and to the filtration equipment of the same volume, the filtration area of the organic waste liquid filter device 1 of the present disclosure can be promoted by nearly one hundred times, and the quality of the produced water is obviously improved.

In at least one embodiment of the present disclosure, the upper die 102 is further connected with the hydraulic cylinder 5, the upper die 102 is configured to move in the vertical direction under the driving of the hydraulic cylinder 5; the upper die 102 can move downwards under the driving of the hydraulic cylinder 5 to be matched with the lower die 103 to form a matched die cavity, so that the filter aid is limited in the matched die cavity to be accumulated into a filter bed, the organic waste liquid to be filtered and the filter aid are prevented from flowing to other positions in the organic waste liquid filtering device 1, and a foundation is provided for the subsequent modular treatment of the filter bed and sludge. Optionally, a circle of sealing rubber ring is arranged at the edge of one side, facing the lower die 103, of the upper die 102, and a circle of sealing rubber ring is arranged at the edge of one side, facing the upper die 102, of the lower die 103, so that a closed die closing cavity can be formed when the upper die 102 and the lower die 103 are closed, the tightness of the die closing cavity can be better ensured, and liquid leakage or gas leakage in the subsequent use process is prevented.

In at least one embodiment of the present disclosure, the organic waste liquid filtering apparatus 1 further includes: a water distributor 105 arranged in the upper die 102, wherein the water distributor 105 is communicated with the conveying pipeline 21.

The organic waste liquid to be filtered which enters the organic waste liquid filtering device 1 through the conveying pipeline 21 passes through the water distributor 105 and can be uniformly distributed on the supporting filter screen 104 in the die assembly cavity, so that the thickness of the formed filter bed is more uniform everywhere, and the organic waste liquid to be filtered is uniformly distributed and can be more fully filtered. The type and specification of the water distributor 105 can be selected according to actual needs, which is not limited in the embodiment of the disclosure.

In at least one embodiment of the present disclosure, the organic waste liquid filtering apparatus 1 further includes: a chain connected to the support screen 104, and a motor connected to the chain; the motor is configured to drive the chain to rotate the support screen 104.

In at least one embodiment of the present disclosure, the lower portion of the housing 101 is provided with a sludge discharge port 106, and the sludge discharge port 106 is disposed at a position corresponding to the revolving portion of the support screen 104.

Illustratively, the periphery of the support screen 104 is edge sealed and perforated, and a single-side-band side plate chain is selected to be bound with the support screen 104. After filtering a period of time, go up mould 102 and move up and accomplish the drawing of patterns with lower mould 103, drive through motor drive single side curb plate chain and support filter screen 104 and rotate, make the filter bed that has the mud along with supporting filter screen 104 and move together, when the filter bed that has the mud removes to the gyration part that supports filter screen 104, row mud mouth 106 is opened, the filter bed that has the mud passes through the action of gravity and falls into in the receipts mud car (not shown in the figure) of below by row mud mouth 106, is taken away by receipts mud car and is carried out subsequent processing.

As shown in fig. 2, some embodiments of the present disclosure further provide an organic waste liquid treatment and recovery system, including the organic waste liquid filtering device 1 according to any of the above embodiments, the organic waste liquid treatment and recovery system further includes: a mixing tank 2 and a stirrer 3 provided in the mixing tank 2. The liquid outlet of the mixing tank 2 is connected with the organic waste liquid filtering device 1; the agitator 3 is configured to uniformly mix the organic waste liquid to be treated in the mixing tank 2 with the filter aid added to the organic waste liquid to be treated.

The beneficial effects that the organic waste liquid treatment and recovery system provided in some embodiments of the present disclosure can achieve are the same as the beneficial effects that the organic waste liquid filtering device 1 provided above can achieve, and are not described herein again.

As shown in fig. 3 and 4, in at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: a control cabinet 4 connected with the stirrer 3. The control cabinet 4 is provided with, for example, an MCU (micro Controller Unit), a CPU (Central Processing Unit), a single chip microcomputer or a PLC (Programmable Logic Controller), and the like, and the control cabinet 4 is a control core of the organic waste liquid treatment and recovery system, executes a corresponding control flow and operation by reading signals or data of each component connected thereto, and then sends the instructions or data to the corresponding component, so as to realize automatic control of the organic waste liquid treatment and recovery process.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: a hydraulic cylinder 5 connected to the upper die 102 and configured to drive the upper die 102 to move in the vertical direction; the hydraulic cylinder 5 is connected with the control cabinet 4, so that the hydraulic cylinder 5 can be controlled by the control cabinet 4 to realize the upward movement or the downward movement of the upper die 102.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: set up waste liquid elevator pump 6 between pending organic waste liquid source and blending tank 2, waste liquid elevator pump 6 is connected with switch board 4, can carry the liquid of pending organic waste liquid source department to blending tank 2 under the control of switch board 4.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: a liquid level sensor 7 arranged at the upper part of the mixing tank 2; the liquid level sensor 7 is connected with the control cabinet 4, and the liquid level sensor 7 is configured to detect the liquid level of the liquid in the mixing tank 2 and transmit a liquid level detection signal to the control cabinet 4; the control cabinet 4 is configured to receive the liquid level detection signal, determine whether the liquid level of the liquid in the mixing tank 2 exceeds a preset liquid level, and if so, control the waste liquid lift pump 6 to be turned off.

That is, after the organic waste liquid to be treated is conveyed to the mixing tank 2 from the organic waste liquid source to be treated by the waste liquid lift pump 6, the liquid level in the mixing tank 2 changes, the liquid level sensor 7 detects the liquid level of the liquid in the mixing tank 2 in real time, and transmits a liquid level detection signal to the control cabinet 4; the switch board 4 receives the liquid level detection signal, judges in real time whether the liquid level of liquid surpasses and predetermines the liquid level in the blending tank 2, if yes, then explains that the liquid in the blending tank 2 has the risk of overflowing, can close through switch board 4 control waste liquid elevator pump 6. The preset liquid level can be set according to the capacity condition of the mixing tank.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: a first dosing tank 8 connected to the mixing tank 2; the first dosing pump 9 is arranged between the first dosing tank 8 and the mixing tank 2, and the first dosing pump 9 is connected with the control cabinet 4; a second dosing tank 10 connected to the mixing tank 2; and a second medicine adding pump 11 provided between the second medicine adding box 10 and the mixing tank 2, the second medicine adding pump 11 being connected to the control cabinet 4.

Can be used to hold the flocculating agent in first dosing tank 8 and the second dosing tank 10 to add the flocculating agent in to the organic waste liquid of pending through corresponding first dosing pump 9 and second dosing pump 11, in order to carry out flocculation pretreatment, be convenient for improve subsequent process's filtration efficiency to the organic waste liquid of pending.

Illustratively, the first dosing tank 8 is used for holding a polyaluminium chloride (PAC) solution with a mass concentration of 2%, and when the solution is conveyed to the mixing tank 2, the volume ratio of the polyaluminium chloride solution to the organic waste liquid to be treated is 3% -5%; the second dosing tank 10 is used for holding a Polyacrylamide (PAM) solution with a mass concentration of 5%, and when the solution is conveyed to the mixing tank 2, the volume ratio of the polyacrylamide solution to the organic waste liquid to be treated is 0.5% -1%.

It will be appreciated that the first and second dosing tanks 8, 10 may be connected to a pipeline of tap or fire water to facilitate the use of an external source of water to prepare the flocculant solution.

After filtering the organic waste liquid, the organic waste liquid treatment and recovery system provided by some embodiments of the present disclosure can also recover and reuse the filtered liquid (recovered liquid).

In at least one embodiment of the present disclosure, the liquid outlet pipe 22 includes a purification branch 221 and a secondary filtering branch 222, and the secondary filtering branch 222 is connected with the mixing tank 2. The organic waste liquid treatment and recovery system further comprises: a clean water tank 18 connected to the cleaning branch 221, a clean water valve 19 provided on the cleaning branch 221, and a secondary filter valve 20 provided on the secondary filter branch 222. The purified water tank 18 is connected to the ozone sterilization device 23, the purified water valve 19 is connected to the control cabinet 4, and the secondary filter valve 20 is connected to the control cabinet 4.

The control cabinet 4 controls the clean water valve 19 to open, and the recovered liquid flowing out through the liquid outlet pipe 22 communicated with the lower die 103 can enter the clean water tank 18 through the purification branch 221. Because this open organic waste liquid handles recovery system does not have the waste liquid to discharge, and the liquid in the whole process flow is constantly recycled and is easily multiplied the bacterium and produce foul gas, consequently utilizes ozone sterilizing equipment 23 (the ozone volume of taking place is 10g/min for example) to carry out the deodorization of disinfecting to the recovery liquid, can effectively purify the recovery liquid to be convenient for carry out recycle to the recovery liquid after the deodorization of disinfecting. The purified liquid flowing out of the purified water tank 18 can be conveyed to a raw liquid preparation pool, for example, to participate in raw material preparation, so that the residual raw materials in the purified liquid can be recycled, thereby saving a large amount of raw material purchasing cost and bringing great economic and social benefits to enterprises.

It can be understood that when the organic waste liquid filtering apparatus 1 is out of order or otherwise affects the filtering of the organic waste liquid, the recovered liquid flowing out of the liquid outlet pipe 22 may not meet the recovery standard, and therefore, the filtering quality of the recovered liquid can be detected by providing a detection port on the liquid outlet pipe 22. When the recovered liquid does not meet the recovery standard, the control cabinet 4 controls the purified water valve 19 to be closed and the secondary filtering valve 20 to be opened, the recovered liquid flows back to the mixing tank 2 through the secondary filtering branch 222, and the recovered liquid can be filtered again after the fault is eliminated.

In at least one embodiment of the present disclosure, the liquid outlet of the mixing tank 2 is communicated with the organic waste liquid filtering apparatus 1 through a conveying pipeline 21, and the organic waste liquid treatment and recovery system further includes: a liquid supply pump 12 provided on the conveying pipe 21 and a liquid supply valve 13 provided on the conveying pipe 21 to control the organic waste liquid to be conveyed from the mixing tank 2 to the organic waste liquid filtering apparatus 1. The liquid supply pump 12 is connected with the control cabinet 4, and the liquid supply valve 13 is connected with the control cabinet 4.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: a pressure sensor 14 connected to the upper die 102; the pressure sensor 14 is connected with the control cabinet 4, and the pressure sensor 14 is configured to detect pressure in a mold clamping cavity formed when the upper mold 102 and the lower mold 103 are clamped and transmit a pressure signal to the control cabinet 4; the control cabinet 4 is further configured to receive the pressure signal, determine whether the pressure in the mold clamping cavity exceeds a first preset pressure, and if so, control the liquid supply pump 12 and the liquid supply valve 13 to close.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: a compressed air tank 15 connected to the upper die 102; a compressed air valve 16 arranged between the compressed air tank 15 and the upper die 102, wherein the compressed air valve 16 is connected with the control cabinet 4; the pressure release valve 17 is arranged between the upper die 102 and the liquid outlet pipeline 22, and the pressure release valve 17 is connected with the control cabinet 4; the control cabinet 4 is also configured to receive the pressure signal, determine whether the pressure in the mold closing cavity exceeds a first preset pressure, and if so, control the compressed air valve 16 to open; and judging whether the pressure in the mold closing cavity is lower than a second preset pressure or not, if so, controlling the compression air valve 16 to be closed, and controlling the relief valve 17 to be opened.

In the filtering process, the sludge is continuously deposited along with the filtering of the filter bed to the sludge, and the filtering resistance is gradually increased. The pressure sensor 14 detects the pressure in a die closing cavity formed when the upper die 102 and the lower die 103 are closed in real time, and transmits a pressure signal to the control cabinet 4; the control cabinet 4 receives the pressure signal in real time, judges whether the pressure in the die closing cavity exceeds a first preset pressure, and the range of the first preset pressure is set to be 0.2-0.25 MPa for example, and the pressure exceeding the first preset pressure indicates that the organic waste liquid is no longer suitable for being continuously filtered; and if the pressure in the die closing cavity is judged to exceed the first preset pressure, the control cabinet 4 controls the liquid supply pump 12 and the liquid supply valve 13 to be closed, so that the organic waste liquid is stopped being conveyed into the die closing cavity.

When the liquid supply valve 13 is closed, the control cabinet 4 can also control the compressed air valve 16 to be opened, so that compressed air in the compressed air tank 15 enters the die closing cavity, and residual liquid in the die closing cavity is filtered by utilizing the compressed air (0.6-0.7 MPa)And blowing out the bed to filter the residual liquid. Then continuously carrying out dehydration and purging on the filter bed by using compressed air, wherein the purging time is 30-60 s, and the air volume is 1.5Nm³And/min. Because the filter bed formed by the filter aid has porosity and good air permeability, the water in the die closing cavity is quickly blown out, thereby completing the drying of the sludge. The dried product is a mixture of filter aid fibers and sludge, has small mass and water content not higher than 60 percent, and can be directly stored and transported to a solid waste treatment plant without further drying treatment.

In the blowing and drying process, the pressure sensor 14 detects the pressure in the die closing cavity in real time, and the pressure in the die closing cavity is gradually reduced along with the blowing of the moisture. After receiving the pressure signal, the control cabinet 4 determines whether the pressure in the mold closing cavity is lower than a second preset pressure, for example, the second preset pressure is set to 0.3MPa, and if the second preset pressure is lower than the second preset pressure, it indicates that the compressed air is no longer required to be continuously introduced, and at this time, the compressed air valve 16 can be controlled to be closed, and the pressure release valve 17 is controlled to be opened. After the purging and drying are finished, the residual pressure in the die closing cavity can be emptied to 0MPa by opening the pressure release valve 17.

In at least one embodiment of the present disclosure, the organic waste liquid filtering apparatus 1 further includes a chain connected to the support screen 104, and a motor connected to the chain; the control cabinet 4 is connected with the motor.

When the purging is finished, the die cavity is opened after the pressure in the die closing cavity is relieved, namely the hydraulic cylinder 5 drives the upper die 102 to move upwards to complete the demolding, the chain is driven by the motor to drive the support filter screen 104 to rotate, so that the dried product moves along with the support filter screen 104, when the dried product moves to the rotary part of the support filter screen 104, the sludge discharge port 106 is opened, and the dried product falls into a sludge collecting vehicle below through the sludge discharge port 106 under the action of gravity and is taken away by the sludge collecting vehicle for subsequent treatment.

By adopting the organic waste liquid treatment and recovery system provided by the disclosure, the generated sludge does not need to be dehydrated further due to the high air permeability of the filter aid fiber, so that the sludge and the fiber which are swept by compressed air are very easy to dehydrate, and the sludge is detected to be in a cake shape, and the water content is lower than 60%.

The organic waste liquid treatment recovery system provided by the disclosure has low maintenance cost, avoids secondary pollution caused by cleaning and maintenance, and is characterized in that the support filter screen 104 is directly contacted with fibers of the filter aid and is not contacted with sticky sludge, so that the filter screen is easily separated from the support filter screen 104 and is prevented from being manually cleaned, and therefore, the support filter screen 104 can be used for a long time, and the maintenance cost is very low.

The organic waste liquid treatment and recovery system provided by the disclosure has low operation cost and low total installed power of complete equipment, the operation equipment comprises a small stirrer 3, a chain motor, pump bodies and the like, and the total installed power is less than 4 KW; in the operation process, the stirrer 3, the motor, the pump body and the like are operated intermittently, and the operation time is short. In addition, the filter aid used is made of crop straws, such as grass fibers, and is low in cost and easy to process.

The organic waste liquid treatment recovery system provided by the disclosure adopts a mold working principle, so that the organic waste liquid filtering device 1 can realize mold closing and demolding of a mold cavity, conveying of a dried product and the like under the control of the control cabinet 4 in the processes of filtering and sludge discharging, thereby realizing the automation of organic waste liquid treatment.

The waste liquid lifting pump 6, the first dosing pump 9, the second dosing pump 11, the liquid feed pump 12 and the like in the embodiment of the disclosure can select a pump body with a proper model according to parameters such as the property, the flow and the like of fluid; the liquid supply valve 13, the compressed air valve 16, the pressure release valve 17, the purified water valve 19, the secondary filter valve 20 and other valves can be electromagnetic valves of proper types to realize the corresponding functions. The present disclosure is not limited to the above-described pump body and valve.

Some embodiments of the present disclosure further provide an organic waste liquid treatment and recovery method, in which the organic waste liquid filtering device 1 and the organic waste liquid treatment and recovery system described in any of the above embodiments are used in an implementation process of the method. The organic waste liquid treatment and recovery method comprises the following steps:

s1, stirring the organic waste liquid to be treated, and adding a filter aid into the organic waste liquid to be treated.

S2, filtering the organic waste liquid to be filtered mixed with the filter aid, comprising: and (3) introducing the organic waste liquid to be filtered into the organic waste liquid filtering device 1 in the organic waste liquid treatment and recovery system, and filtering. Wherein, organic waste liquid filter equipment 1 includes: the device comprises a shell 101, an upper die 102 positioned in the shell 101, a lower die 103 positioned in the shell 101 and opposite to the upper die 102, and an annular conveyer belt type support filter screen 104 arranged around the lower die 103; the upper die 102 communicates with the delivery duct 21, the lower die 103 communicates with the liquid outlet duct 22, and a portion of the support screen 104 located on a side of the lower die 103 facing the upper die 102 is configured to attach a filter aid in the organic waste liquid to be filtered.

And S3, recovering the filtered liquid.

In at least one embodiment of the present disclosure, the filter aid includes at least one of grass fibers, wood fibers, glass fibers, pulp fibers, and diatomaceous earth.

Because the solid waste of diatomaceous earth, glass fiber, paper pulp fiber needs secondary treatment, and the cost is higher, and glass fiber filtering precision is lower for the grass fiber in addition, under the condition of high purification efficiency requirement, can not satisfy the demand, consequently, in some embodiments of this disclosure, chooseing the grass fiber as the filter aid.

In at least one embodiment of the present disclosure, the mass ratio of the filter aid to the organic waste liquid to be treated is 1% to 3%. If the mass ratio of the filter aid to the organic waste liquid to be treated is too small, the filtering precision is poor, the liquid yield after filtering is low, and the demolding time is long; if the mass ratio is too large, waste of the filter aid is easily caused, the solid waste amount is increased, and the cost of subsequent treatment of the solid waste is increased. Illustratively, 5KG of a grass fiber filter aid with the model of TM300 is selected and added into 250KG of organic waste liquid.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes a mixing tank 2, a stirrer 3 disposed in the mixing tank 2, and a control cabinet 4 connected to the stirrer 3. In step S1, the organic waste liquid to be treated is stirred, and a filter aid is added to the organic waste liquid to be treated, including:

s11, adding the organic waste liquid to be treated into the mixing tank 2.

S12, controlling the stirrer 3 to rotate by the control cabinet 4, adding the filter aid into the mixing tank 2 under the stirring condition, and uniformly mixing the organic waste liquid to be treated in the mixing tank 2 with the filter aid. The filter aid is added into the mixing tank 2 under the condition of stirring, so that the filter aid can be prevented from settling, and the filter aid and the organic waste liquid to be treated can be fully and uniformly mixed.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: a waste liquid lift pump 6 arranged between the organic waste liquid source to be treated and the mixing tank 2, and a liquid level sensor 7 arranged at the upper part of the tank body of the mixing tank 2; the waste liquid lift pump 6 is connected with the control cabinet 4, and the liquid level sensor 7 is connected with the control cabinet 4. In step S11, the organic waste liquid to be treated is added to the mixing tank 2, including:

s111, conveying the organic waste liquid to be treated from the organic waste liquid source to be treated to the mixing tank 2 through the waste liquid lifting pump 6;

s112, the liquid level sensor 7 detects the liquid level of the liquid in the mixing tank 2 and transmits a liquid level detection signal to the control cabinet 4; the control cabinet 4 receives the liquid level detection signal, judges whether the liquid level of the liquid in the mixing tank 2 exceeds a preset liquid level, and controls the waste liquid lift pump 6 to be closed if the liquid level of the liquid in the mixing tank exceeds the preset liquid level.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes a hydraulic cylinder 5 connected to the upper mold 102, the hydraulic cylinder 5 being connected to the control cabinet 4; the mixing tank 2 communicates with the upper die 102 through the delivery pipe 21. In step S2, the filtering of the organic waste liquid to be filtered mixed with the filter aid includes:

s21, the control cabinet 4 controls the hydraulic cylinder 5 to drive the upper die 102 to move downwards, so that the upper die 102 and the lower die 103 are closed to form a die closing cavity;

s22, introducing the organic waste liquid to be filtered mixed with the filter aid into a die assembly cavity formed by die assembly through the conveying pipeline 21 by the mixing tank 2; the filter aid is attached to a support filter screen 104 between the upper die 102 and the lower die 103 to form a filter bed, the thickness of the filter bed is gradually increased along with the filtering time, the sludge capacity is gradually increased, and the filtering area is gradually increased;

s23, after the organic waste liquid is filtered by the filter bed, the sludge in the organic waste liquid to be filtered is left in the filter bed;

and S24, filtering the organic waste liquid to form a recovery liquid, and discharging the recovery liquid through a liquid outlet pipeline 22 communicated with the lower die 103.

In at least one embodiment of the present disclosure, the outlet pipe 22 comprises a purge branch 221; the organic waste liquid treatment and recovery system also comprises a purified water tank 18 connected with the purification branch 221, and a purified water valve 19 arranged on the purification branch 221, wherein the purified water valve 19 is connected with the control cabinet 4; the clean water tank 18 is connected to an ozone sterilization device 23. In step S3, the step of recovering the filtered liquid includes:

s31, the control cabinet 4 controls the clean water valve 19 to open, and the recovered liquid enters the clean water tank 18 through the purification branch 221;

s32, the ozone sterilization device 23 carries out sterilization and deodorization on the recovered liquid;

and S33, recycling the sterilized and deodorized recovered liquid.

In at least one embodiment of the present disclosure, the liquid outlet pipe 22 further includes a secondary filtering branch 222, and the secondary filtering branch 222 is connected to the mixing tank 2; the organic waste liquid treatment and recovery system further comprises a secondary filtering valve 20 arranged on the secondary filtering branch 222, and the secondary filtering valve 20 is connected with the control cabinet 4. In step S3, the step of recovering the filtered liquid further includes:

and S34, detecting the recovered liquid flowing out of the lower die 103, and when the recovered liquid does not meet the recovery standard, controlling the purified water valve 19 to close and the secondary filter valve 20 to open by the control cabinet 4, and enabling the recovered liquid to enter the mixing tank 2 through the secondary filter branch 222.

In at least one embodiment of the present disclosure, the organic waste liquid treatment and recovery system further includes: the device comprises a liquid supply device arranged on a conveying pipeline 21, a liquid supply valve 13 arranged on the conveying pipeline 21, a pressure sensor 14 connected with an upper die 102, a compressed air tank 15 connected with the upper die 102, a compressed air valve 16 arranged between the compressed air tank 15 and the upper die 102, and a pressure release valve 17 arranged between the upper die 102 and a liquid outlet pipeline 22; the liquid supply pump 12, the liquid supply valve 13, the pressure sensor 14, the compressed air valve 16 and the relief valve 17 are connected to the control cabinet 4. After the step S2 of filtering the organic waste liquid to be filtered mixed with the filter aid, the method for treating and recovering the organic waste liquid further comprises: and S4, performing dehydration and purging on the filter bed and the sludge. The method comprises the following steps:

s41, the pressure sensor 14 detects the pressure in the die closing cavity and transmits a pressure signal to the control cabinet 4;

s42, the control cabinet 4 receives the pressure signal, judges whether the pressure in the die closing cavity exceeds a first preset pressure, and if so, controls the liquid supply pump 12 and the liquid supply valve 13 to be closed and controls the compressed air valve 16 to be opened;

s43, blowing out the liquid remained in the die closing cavity through the filter bed by using the compressed air in the compressed air tank 15, and dehydrating and purging the filter bed and the sludge in the filter bed;

and S44, the control cabinet 4 continuously receives the pressure signal, judges whether the pressure in the mold closing cavity is lower than a second preset pressure, and controls the compression air valve 16 to close and controls the relief valve 17 to open if the pressure in the mold closing cavity is lower than the second preset pressure.

In at least one embodiment of the present disclosure, the organic waste liquid filtering apparatus 1 further includes: a chain connected to the support screen 104, and a motor connected to the chain; the motor is connected with the control cabinet 4; the lower part of the shell 101 is provided with a sludge discharge port 106, and the position of the sludge discharge port 106 corresponds to the rotary part of the support screen 104. After the filter bed and the sludge are subjected to dehydration purging in step S4, the organic waste liquid treatment and recovery method further includes:

s5, the control cabinet 4 controls the hydraulic cylinder 5 to drive the upper die 102 to move upwards, so that the upper die 102 and the lower die 103 are separated from each other;

s6, the control cabinet 4 controls the motor to drive the chain to drive the support filter screen 104 to rotate, and the filter bed and the sludge move along with the support filter screen 104; when the bed and sludge move to the turn section supporting the screen 104, they fall under gravity through the discharge port 106 into the hopper car.

In at least one embodiment of the present disclosure, before filtering the organic waste liquid to be filtered mixed with the filter aid in step S2, the organic waste liquid treatment and recovery method further includes: s7, adding a flocculating agent into the organic waste liquid to be treated.

In at least one embodiment of the present disclosure, the flocculant is selected from a polyaluminum chloride solution and/or a polyacrylamide solution; wherein the mass concentration of the polyaluminium chloride solution is 2 percent, and the volume ratio of the polyaluminium chloride solution to the organic waste liquid to be treated is 3 to 5 percent; the mass concentration of the polyacrylamide solution is 5 percent, and the volume ratio of the polyacrylamide solution to the organic waste liquid to be treated is 0.5 to 1 percent.

The product and the method provided by the embodiment of the disclosure can realize solid-liquid separation and recovery with high filtration precision in industrial production, such as solid-liquid separation and recovery of waste oil mixed with mechanical impurities or solid particles, solid-liquid separation and recovery of polishing grinding fluid, solid-liquid separation and recovery of cutting fluid and emulsion in a machining process, and solid-liquid separation and recovery of release agent in the casting industry; and the turbidity of the recovered liquid can be obviously reduced.

It should be noted that the steps of the organic waste liquid treatment and recovery method are optional exemplary methods, and the order of the steps can be adjusted according to actual production conditions.

The method for treating and recovering an organic waste liquid using the above-described organic waste liquid filtering apparatus 1 and organic waste liquid treatment and recovery system will be described in detail with reference to specific examples.

The organic waste liquid to be treated is lifted into the mixing tank 2 by the waste liquid lifting pump 6, the control cabinet 4 controls the stirrer 3 to work, and 5kg of grass fiber is added under the stirring condition.

The organic waste liquid filtering device 1 is driven by the hydraulic cylinder 5, and the upper die 102 descends to complete die assembly with the lower die 103.

After the organic waste liquid and the mixed liquid of the grass fibers are uniformly stirred, a liquid supply pump 12 is started, a liquid supply valve 13 is opened simultaneously, filtered liquid is introduced into the organic waste liquid filtering device 1, the filtered recovery liquid flows into a purified water tank 18, the purified water tank 18 is communicated with an ozone sterilization device 23, and the recovery liquid enters a production system after sterilization and deodorization to wait for recycling

The pressure sensor 14 detects the pressure in the die closing cavity in real time, when the pressure in the die closing cavity rises to 0.25MPa, the liquid supply pump 12 stops, the liquid supply valve 13 is closed, the compressed air valve 16 is opened at the moment, and compressed air (0.7MPa) is introduced into the die closing cavity.

The residual liquid in the die cavity is filtered by the filter bed by using compressed airBlowing out to filter the residual liquid. Then, the filter bed is continuously dehydrated and purged by utilizing compressed air, the purging time is 40s, and the air volume is 1.5Nm³/min。

And when the pressure in the die cavity is reduced to be below 0.3MPa, closing the compression air valve 16, opening the pressure release valve 17, and reducing the pressure in the die cavity to be 0 MPa.

The hydraulic cylinder 5 drives the upper die 102 to move upward, so that the upper die 102 and the lower die 103 are completely released. The motor is started, the drive chain drives the support filter screen 104 to move along the ring shape, the sludge and the fiber after blowing, dewatering and drying fall into the sludge collecting vehicle, the whole process of filtering and discharging sludge is completed, and the organic waste liquid treatment and recovery system automatically enters the next cycle.

It should be noted that, in the present specification, each embodiment is described in a progressive manner, and the same or similar parts in each embodiment may be referred to each other, and each embodiment focuses on differences from other embodiments. Particularly, as for the method embodiments related to the present disclosure, since the method embodiments are basically similar to the product embodiments, the method embodiments are described in simpler parts, and the related parts can be referred to the part descriptions of the product embodiments.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. "and/or" is simply an association that describes an associated object, meaning three relationships, e.g., A and/or B, expressed as: a exists alone, A and B exist simultaneously, and B exists alone. The terms "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present disclosure. Meanwhile, in the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection or electrical connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims (10)

1. An organic waste liquid filtering device, comprising:

a housing;

the upper die is positioned in the shell and communicated with the conveying pipeline;

the lower die is positioned in the shell and is opposite to the upper die, and the lower die is communicated with the liquid outlet pipeline; and the number of the first and second groups,

an endless belt-type support screen disposed around the lower mold, wherein a portion of the support screen located at a side of the lower mold facing the upper mold is configured to attach a filter aid in an organic waste liquid to be filtered.

2. The organic waste liquid filtering device according to claim 1, wherein the upper mold is further connected to a hydraulic cylinder, and the upper mold is configured to move in a vertical direction by being driven by the hydraulic cylinder;

the upper die can move downwards under the driving of the hydraulic cylinder to be matched with the lower die to form a matched die cavity.

3. The organic waste liquid filtering apparatus according to claim 1, further comprising: and the water distributor is arranged in the upper die and is communicated with the conveying pipeline.

4. The organic waste liquid filtering apparatus according to claim 1, further comprising:

a chain connected with the support screen; and

and the motor is connected with the chain and is configured to drive the chain to drive the supporting filter screen to rotate.

5. An organic waste liquid treatment and recovery system comprising the organic waste liquid filtering device according to any one of claims 1 to 4, wherein the organic waste liquid treatment and recovery system further comprises:

the liquid outlet of the mixing tank is connected with the organic waste liquid filtering device;

an agitator disposed in the mixing tank, the agitator configured to uniformly mix the organic waste liquid to be treated in the mixing tank with a filter aid added to the organic waste liquid to be treated.

6. The organic waste liquid treatment recovery system according to claim 5, further comprising: and the control cabinet is connected with the stirrer.

7. The organic waste liquid treatment recovery system according to claim 6, further comprising:

the waste liquid lifting pump is arranged between the organic waste liquid source to be treated and the mixing tank and is connected with the control cabinet;

the liquid level sensor is arranged at the upper part of the tank body of the mixing tank and is connected with the control cabinet;

the liquid level sensor is configured to detect a liquid level of the liquid in the mixing tank and transmit a liquid level detection signal to the control cabinet;

the control cabinet is configured to receive the liquid level detection signal, judge whether the liquid level of the liquid in the mixing tank exceeds a preset liquid level, and if so, control the waste liquid lift pump to be turned off.

8. The organic waste liquid treatment and recovery system according to claim 6, wherein the liquid outlet of the mixing tank is communicated with the organic waste liquid filtering device through the conveying pipeline, and the organic waste liquid treatment and recovery system further comprises:

the liquid supply pump is arranged on the conveying pipeline and is connected with the control cabinet;

the liquid supply valve is arranged on the conveying pipeline and connected with the control cabinet;

the pressure sensor is connected with the upper die and is connected with the control cabinet;

the pressure sensor is configured to detect pressure in a mold clamping cavity formed when the upper mold and the lower mold are clamped, and transmit a pressure signal to the control cabinet;

the control cabinet is further configured to receive the pressure signal, judge whether the pressure in the mold closing cavity exceeds a first preset pressure, and if so, control the liquid supply pump and the liquid supply valve to be closed.

9. The organic waste liquid treatment recovery system according to claim 8, further comprising:

the compressed air tank is connected with the upper die;

the compressed air valve is arranged between the compressed air tank and the upper die and is connected with the control cabinet; and the number of the first and second groups,

the pressure relief valve is arranged between the upper die and the liquid outlet pipeline and is connected with the control cabinet;

the control cabinet is also configured to receive the pressure signal and has the function of controlling the compressed air valve to be opened when the pressure in the mold closing cavity exceeds a first preset pressure; and when the pressure in the die closing cavity is lower than a second preset pressure, controlling the compression air valve to be closed and controlling the pressure release valve to be opened.

10. The organic waste liquid treatment and recovery system according to claim 6, wherein the liquid outlet pipeline comprises a purification branch and a secondary filtration branch, and the secondary filtration branch is connected with the mixing tank; the organic waste liquid treatment and recovery system further comprises:

the water purifying tank is connected with the purifying branch and is connected to the ozone sterilization device;

the water purifying valve is arranged on the purifying branch and is connected with the control cabinet; and the number of the first and second groups,

the secondary filter valve is arranged on the secondary filter branch and connected with the control cabinet.

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