WO2019153744A1

WO2019153744A1 - Solid-liquid separation system

Info

Publication number: WO2019153744A1
Application number: PCT/CN2018/105808
Authority: WO
Inventors: 余章军
Original assignee: 福建希海环保科技有限公司
Priority date: 2018-02-08
Filing date: 2018-09-14
Publication date: 2019-08-15
Also published as: CN108043108A

Abstract

Disclosed in the present application is a solid-liquid separation system, comprising a waste acid storage tank, a clean water tank, a filter press, a thickening filtration device, and a collecting tank; both the waste acid storage tank and the clean water tank are communicated with the liquid inlet of the filter press by means of a first suction pump, the water outlet of the filter press is communicated with the liquid inlet of the thickening filtration device by means of a second suction pump, and the clean water outlet of the thickening filtration device is communicated with the collecting tank; the water outlet of the filter press is also communicated with a wastewater tank, and the inlet of the wastewater tank is provided with a fourth valve. According to the present solid-liquid separation system, blockage will not occur even if a filter element is not replaced, the costs are reduced, and the service life of the filter press is prolonged; both solid and liquid separated by the system can be recycled, zero-pollutant emission is implemented, the problem of resource waste is solved, and the production and treatment costs of enterprises are greatly reduced.

Description

Solid-liquid separation system

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 20110112608, the entire disclosure of which is incorporated herein by reference.

Technical field

The present application relates to the field of waste liquid processing technology, and in particular to a solid-liquid separation system.

Background technique

Stainless steel is widely used for its excellent corrosion resistance and good appearance. In the production process, stainless steel is inevitably subjected to annealing, normalizing, quenching, welding and other processes, and the surface often produces black scale. The scale not only affects the appearance quality of the stainless steel, but also adversely affects the subsequent processing of the product. Therefore, it must be removed by surface treatment such as pickling or polishing before subsequent processing.

In the existing stainless steel production process, the sulfuric acid pickling section and the mixed acid pickling section process generate a large amount of waste acid solution with high acid concentration and high content of solid impurities. Direct discharge into the lagoon creates high cost and load pressure for subsequent wastewater treatment.

The existing process also uses a filter for processing, but the following problems exist:

1. The filter is often clogged and the filter element must be replaced;

2. After cleaning, filter the filter, waste a lot of water resources and produce a lot of waste water;

3. Need special maintenance, manual operation and high risk;

4. The solid waste generated requires manual cleaning, which is difficult and has a high acid concentration and does not meet environmental requirements.

Summary of the invention

In view of this, the object of the present application includes providing a solid-liquid separation system capable of overcoming at least one of the problems of the prior art described above.

The solid-liquid separation system does not need to replace the filter element and does not cause clogging, which can save costs and prolong the service life of the filter press. The solids and liquids obtained by the separation of the system can be recycled, and not only zero pollutant emissions are realized, It effectively reduces the processing cost and load, and solves the problem of waste of resources, and greatly reduces the production and processing costs of the enterprise, and has great social and economic benefits.

This application uses the following technical solutions:

A solid-liquid separation system comprising a waste acid storage tank, a clean water tank, a filter press, a concentration filter device and a collection tank;

The waste acid storage tank and the clean water tank are both connected to the liquid inlet of the filter press through a first suction pump, and the water outlet of the waste acid storage tank is provided with a first valve, and the clear water tank a second valve is provided at the water outlet;

The water outlet of the filter press is connected to the liquid inlet of the concentrated filter device through a second suction pump, and the inlet of the second suction pump is provided with a third valve;

The water clearing port of the concentrated filtering device is in communication with the collecting pool;

The water outlet of the filter press is also connected to a wastewater tank, and the inlet of the wastewater tank is provided with a fourth valve.

Preferably, the solid-liquid separation system further includes a first compressed air generating device, wherein the first compressed air generating device communicates with a liquid inlet of the filter press through a first suction pump, the first compressed air The fifth valve is provided at the air outlet of the generating device.

Preferably, the solid-liquid separation system further includes a second compressed air generating device, the water outlet of the filter press is in communication with the second compressed air generating device, and the air outlet of the second compressed air generating device is provided Six valves.

Preferably, the liquid inlet of the filter press is provided with a seventh valve.

Preferably, the solid-liquid separation system further includes a third compressed air generating device, the water clearing port of the concentrated filtering device is in communication with the third compressed air generating device, and the air outlet of the third compressed air generating device is provided with Eight valves, the inlet of the collection tank is provided with a ninth valve.

Preferably, the liquid inlet of the concentrated filtering device is provided with a tenth valve.

Preferably, an intermediate pool is provided between the water outlet of the filter press and the inlet of the second suction pump, and the inlet of the intermediate tank is provided with an eleventh valve.

Preferably, a liquid level gauge is disposed in the intermediate tank.

Preferably, the solid-liquid separation system further includes a filter residue recovery treatment device, and the filter residue outlet of the filter press is in communication with the filter residue recovery treatment device.

Preferably, the filter residue recovery processing device comprises a filter residue collection cleaning pool and a filter residue storage pool;

a solid inlet is opened at a top of the filter collection and cleaning tank, and a solid outlet is opened on a sidewall of the filter collection and cleaning tank, and one end of the filter collection and cleaning tank is provided with a connection with the solid inlet, and another a sloped solid slide at one end in communication with the solids outlet;

The solid slide includes a frame portion and a sieve disposed on the frame portion;

a water spray device is disposed on the inner top of the filter residue collection and cleaning tank, the water spray device is configured to spray clean water to the solid slide, and a liquid outlet is opened at the bottom of the filter collection and cleaning pool;

The solids outlet is in communication with the filter residue storage tank.

Preferably, the liquid outlet is in communication with the liquid inlet of the concentrated filtration device through the second suction pump.

Preferably, the water inlet of the fresh water sprinkler device communicates with the water outlet of the clear water pool through a third suction pump, and a thirteenth valve is disposed on the water inlet of the fresh water sprinkler device.

Preferably, the filter residue storage tank has a drying device including a hot air blower disposed at the top of the filter residue storage tank and capable of blowing air to the inside of the filter residue storage tank.

Preferably, the filter residue collection wash tank further has a purge device capable of purging the filter residue on the solid slide.

Preferably, the purging device includes a gas source and a high pressure air gun connected to the gas source, the gas outlet of the high pressure air gun being aligned with the solid inlet.

Preferably, a funnel-shaped guiding device whose opening has a diameter which gradually decreases from the top to the bottom is provided on the solid inlet.

Preferably, the funnel-shaped guiding device is connected to the edge of the solid inlet through a soft connecting pipe, and a vibration motor is disposed on an outer side wall of the funnel-shaped guiding device.

Preferably, a plurality of sets of cushioning devices are further disposed between the funnel-shaped guiding device and the solid inlet.

Preferably, the cushioning device comprises an upper connecting block, a lower connecting block and a spring vertically disposed between the upper connecting block and the lower connecting block, the upper connecting block and an outer side of the funnel-shaped guiding device A wall connection, the lower connection block being connected to the top of the filter collection cleaning bath.

Preferably, the concentrated water outlet of the concentrated filtering device is provided with a twelfth valve, and the concentrated water outlet of the concentrated filtering device is in communication with the waste acid storage tank.

Compared with the prior art, the beneficial effects of the solid-liquid separation system of the present application are:

(1) The solid-liquid separation system of the present application is subjected to solid-liquid separation by a filter press and a concentration filter device, and after the solid-liquid separation of the waste acid liquid by the filter press, the filter residue in the filter press is rinsed with clean water. In the whole working process of the solid-liquid separation system, there is no need to replace the filter element or blockage, save cost and prolong the service life of the filter press. The solid and liquid obtained after separation by the system can be recycled, not only realize zero Pollutant emissions effectively reduce processing costs and loads, and solve the problem of waste of resources, and greatly reduce the production and processing costs of enterprises, with great social and economic benefits.

(2) The solid-liquid separation system of the present application has high automation degree, safe operation, stability, simple operation, convenient management and better treatment effect.

(3) Further, the solid-liquid separation system of the present application reduces the amount of waste water generated by the cleaning and further reduces the maintenance cost by using compressed air to ensure that the filter press and the concentrated filter device are not clogged.

The above described objects, features, and advantages of the present invention will become more apparent from the following description.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings to be used in the embodiments will be briefly described below. It should be understood that the following drawings show only certain embodiments of the present application, and therefore It should be seen as a limitation on the scope, and those skilled in the art can obtain other related drawings according to these drawings without any creative work.

1 is a schematic structural view of a solid-liquid separation system of the present application.

2 is a schematic structural view of a filter residue recovery processing apparatus of the solid-liquid separation system of the present application.

3 is a schematic view showing the specific structure of the filter residue collection and cleaning tank of FIG.

4 is a schematic view showing the specific structure of the solid slide in FIG. 3.

FIG. 5 is a schematic view showing the specific structure of the filter residue storage tank of FIG. 2.

Description of the reference numerals:

1-waste acid storage tank; 2-clean water tank; 3-filter press; 4-concentrated filter device; 5-collection tank; 6-first valve; 7-second valve; 8-first suction pump; - third valve; 10 - second suction pump; 11 - waste water tank; 12 - fourth valve; 13 - first compressed air generating device; 14 - fifth valve; 15 - second compressed air generating device; Sixth valve; 17-seventh valve; 18-third compressed air generating device; 19-eighth valve; 20-ninth valve; 21-th tenth valve; 22- eleventh valve; 23-intermediate pool; - level gauge; 25 - twelfth valve; 26 - filter residue recovery treatment device; 27 - filter residue collection cleaning tank; 271 - solid inlet; 272 - solids outlet; 273 - liquid outlet; 28 - filter residue storage tank; Slide; 291-frame; 292-filter; 30-water spray device; 301-thirteenth valve; 31-third suction pump; 32-hot air blower; 33-air source; 34-high pressure air gun; 35-Funnel-shaped guiding device; 36-soft connecting tube; 37-vibrating motor; 38-buffering device; 39-upper connecting block; 40-lower connecting block; 41-spring.

Detailed ways

The embodiments of the present application are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are exemplified and are not to be construed as limiting the invention.

In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Out, Clockwise, Counterclockwise, Axial The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present application and the simplified description, and does not indicate or imply the indicated device or The elements must have a particular orientation, are constructed and operated in a particular orientation, and are therefore not to be construed as limiting.

Moreover, the terms "first" and "second" are only used for descriptive purposes and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.

In the present application, the first feature "on" or "below" the second feature may be the direct contact of the first and second features, or the first and second features are indirectly through the intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the application. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

In the description of the present application, unless otherwise specified and limited, it should be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be, for example, mechanical or electrical, or both. The internal communication of the components may be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms may be understood according to specific circumstances. All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention are, unless otherwise defined. The term (such as a term defined in a commonly used dictionary) will be interpreted as having the same meaning as the contextual meaning in the related art and will not be interpreted as having an idealized meaning or an overly formal meaning, Unless clearly defined in the various embodiments of the present application.

Example

Referring to Figure 1, a solid-liquid separation system includes a spent acid storage tank 1, a clear water tank 2, a filter press 3, a concentration filtration unit 4, and a collection tank 5.

The waste acid storage tank 1 and the clean water tank 2 are both connected to the liquid inlet of the filter press 3 through the first suction pump 8, and the water outlet of the waste acid storage tank 1 is provided with a first valve 6, and the water outlet of the clear water tank 2 is provided. There is a second valve 7.

The water outlet of the filter press 3 is in communication with the inlet of the concentrated filter unit 4 via a second suction pump 10, and the third valve 9 is provided at the inlet of the second suction pump 10.

The water outlet of the concentrated filtration device 4 is in communication with the collection tank 5.

The water outlet of the filter press 3 is also connected to the wastewater tank 11, and the inlet of the wastewater tank 11 is provided with a fourth valve 12.

It should be noted that the above-mentioned concentrated filtration device 4 is preferably a microporous filter cartridge, and of course, may be listed as a high pressure reverse osmosis roll membrane or a high pressure reverse osmosis disc membrane, a vibrating membrane, a forward osmosis membrane, a nanofiltration membrane, and an ultrafiltration. Membrane, nanofiltration-microfiltration combination device or common filter element.

In the embodiment of the present application, after the waste acid solution is further filtered by providing the concentrated filter device 4, a trace amount of fine solid suspended matter in the waste acid solution can be more completely removed, and the filtered filtered water is discharged from the clean water port of the concentration filter device 4. Collect the pool 5 and recycle it.

Preferably, referring to FIG. 1 , in the embodiment of the present application, the solid-liquid separation system further includes a first compressed air generating device 13 , and the first compressed air generating device 13 passes through the first suction pump 8 and the liquid inlet of the filter press 3 . In communication, the air outlet of the first compressed air generating device 13 is provided with a fifth valve 14.

It should be noted that the first compressed air generating device 13 is configured to pass compressed air into the pipeline, the suction pump, and the waste acid solution in the filter press 3 after the waste acid is filtered by the filter press 3. After being pushed by the pressure difference, it is discharged to the subsequent concentrated filtering device 4 for further filtering treatment; and configured to flush the filter residue in the filter press 3 with the water in the clean water tank 2, and then introduce compressed air to make the pipe and pump The wastewater in the suction pump and in the filter press 3 is discharged into the wastewater tank 11 under the pressure difference.

Preferably, referring to FIG. 1 , in the embodiment of the present application, the solid-liquid separation system further includes a second compressed air generating device 15 , and the water outlet of the filter press 3 communicates with the second compressed air generating device 15 , and the second compressed air generating device The sixth valve 16 is provided at the air outlet of 15.

It should be noted that the second compressed air generating device 15 is configured to pass the compressed air backflushing after the wastewater in the pipeline, the suction pump and the filter press 3 is discharged into the wastewater tank 11, and the pressure filter is The filter residue in the machine 3 is discharged from the filter residue outlet of the filter press 3.

Preferably, referring to FIG. 1 , in the embodiment of the present application, the liquid inlet of the filter press 3 is provided with a seventh valve 17 .

Preferably, referring to FIG. 1, in the embodiment of the present application, the solid-liquid separation system further includes a third compressed air generating device 18, and the water clearing port of the concentrated filtering device 4 is in communication with the third compressed air generating device 18, and the third compressed air generating device 18 The gas outlet is provided with an eighth valve 19, and the inlet of the collection tank 5 is provided with a ninth valve 20.

It should be noted that the third compressed air generating device 18 is configured to perform the backwashing of the concentrated acid filtering device 4 after the waste acid liquid is further filtered and discharged into the collecting tank 5 through the concentrated filtering device 4, and then the compressed air is introduced. The concentrate is discharged and reused.

Preferably, referring to FIG. 1 , in the embodiment of the present application, the liquid inlet of the concentrated filtering device 4 is provided with a tenth valve 21 .

Preferably, referring to FIG. 1, in the embodiment of the present application, an intermediate pool 23 is disposed between the water outlet of the filter press 3 and the inlet of the second suction pump 10, and the eleventh valve 22 is provided at the inlet of the intermediate tank 23.

It should be noted that the intermediate tank 23 is configured to store the waste acid liquid discharged after the filter press 3 is filtered, and after being accumulated to a certain amount, it is sent to the subsequent concentrated filter device 4 for filtration, so as to avoid intermittently providing the waste acid solution. The concentrated filter device 4 affects the service life of the concentrated filter device 4.

Preferably, referring to FIG. 1 , in the embodiment of the present application, a liquid level gauge 24 is disposed in the intermediate pool 23 .

It can be understood that the above liquid level gauge 24 is configured to monitor the liquid level of the waste acid liquid in the intermediate pool 23 in real time, and when it reaches the set liquid level, discharge the waste acid liquid in the intermediate pool 23 to the subsequent concentrated filtration. Filtration processing is performed in the device 4.

Preferably, referring to FIG. 1 , in the embodiment of the present application, the solid-liquid separation system further includes a filter residue recovery processing device 26 , and the filter residue outlet of the filter press 3 is in communication with the filter residue recovery treatment device 26 .

The residue recovery processing device 26 is configured to treat the solid waste generated by the dewatering of the filter press 3 and recycle it. The filter residue recovery treatment device 26 can be exemplified as a calciner. When the main component of the solid waste residue is a metal hydroxide, the metal oxide is obtained by calcination to obtain a metal oxide having a higher purity; or further, hydrogen and nitrogen gas are introduced into the calciner. The metal oxide continues to be reduced to a purer metal element, and the resulting metal element or metal oxide can be recycled. Of course, the filter residue recovery processing device 26 can also be other drying devices, and the solid waste residue is dried and then subjected to other treatments.

Preferably, referring to FIG. 2, in the embodiment of the present application, the filter residue recovery processing device 26 includes a filter residue collection cleaning pool 27 and a filter residue storage pool 28;

Referring to Fig. 3, a solid inlet 271 is opened at the top of the residue collection cleaning tank 27, and a solid outlet 272 is opened on the side wall of the residue collection cleaning tank 27, and one end of the residue collection and cleaning tank 27 is provided with a solid inlet 271. a sloped solid slide 29 communicating with the solid outlet 272 at the other end;

Referring to Figure 4, the solid slide 29 includes a frame portion 291 and a screen 292 disposed on the frame portion 291;

Referring to Fig. 3, a fresh water sprinkler device 30 is disposed at the inner top of the filter residue collection cleaning tank 27, and the fresh water sprinkler device 30 is disposed to spray clean water to the solid chute 29, and a liquid outlet 273 is opened at the bottom of the dreg collection and cleaning tank 27. ;

The solids outlet 272 is in communication with the filter residue storage tank 28.

It can be understood that the above-mentioned filter residue enters the solid chute 29 from the filter residue outlet of the filter press 3, and rolls down or slides down to the solid outlet 272 along the solid chute 29 under the action of gravity and the flushing of the fresh water sprinkler device 30. After entering the filter residue storage tank 28, the filter residue is secondarily cleaned by the fresh water spray device 30 in the whole process to clean the filter residue and reduce the amount of acid liquid carried.

Preferably, referring to FIG. 2, in the embodiment of the present application, the liquid outlet 273 is in communication with the liquid inlet of the concentrated filtering device 4 through the second suction pump 10.

It can be understood that the above-mentioned cleaned water of the filter residue flows out into the concentrated filter device 4 to remove a trace amount of fine solid suspended matter which cannot be filtered out by the filter 292 of the solid chute 29, and the filtered filtered water is self-concentrated and filtered. The water outlet of the device 4 is discharged into the collection tank 5 and recycled.

Preferably, referring to FIG. 2, in the embodiment of the present application, the water inlet of the water spray device 30 communicates with the water outlet of the clear water tank 2 through the third suction pump 31, and the water inlet of the water spray device 30 is provided with a Thirteen valves 301.

It can be understood that the water in the clear water tank 2 is used as the water source for the secondary cleaning of the filter residue. Of course, the water source can also be separately provided with other clear water pools instead of sharing a clear water pool with the filter press.

Preferably, referring to FIG. 5, in the embodiment of the present application, the filter residue storage tank 28 has a drying device including a hot air blower 32 disposed at the top of the filter residue storage tank 28 and capable of blowing air into the interior of the filter residue storage tank 28.

It can be understood that after the filter residue is dried by the hot air blower 32 as a drying device, the continuous rust of the filter residue can be avoided, and the degree of corrosion of the filter residue can be reduced.

Preferably, referring to FIG. 3, in the embodiment of the present application, the filter residue collection cleaning tank 27 further has a purging device capable of purging the filter residue on the solid chute 29.

It can be understood that under the action of the purging device, the speed at which the filter residue rolls off or slides down to the solid outlet 272 along the solid chute 29 can be accelerated, and the efficiency of the filter residue treatment can be improved, and at the same time, the solid chute 29 can be prevented from being clogged.

Preferably, referring to FIG. 3, in the embodiment of the present application, the purging device includes a gas source 33 and a high pressure air gun 34 connected to the gas source 33, and an air outlet of the high pressure air gun 34 is aligned with the solid inlet 271.

It can be understood that the high-pressure air gun 34 has a high-pressure nozzle, and the air source thereof can be an air compressor.

Preferably, referring to FIG. 3, in the embodiment of the present application, the solid inlet 271 is provided with a funnel-shaped guiding device 35 whose opening diameter is gradually reduced from top to bottom.

It can be understood that the above-mentioned funnel-shaped guiding device 35 can increase the opening area of the solid inlet 271. Since the diameter of the opening gradually decreases from the top to the bottom, the filter residue can be slidably guided to make the filter residue smoothly fall into the filter. Solid inlet 271.

Preferably, referring to FIG. 3, in the embodiment of the present application, the funnel-shaped guiding device 35 is connected to the edge of the solid inlet 271 through the soft connecting pipe 36, and the vibration motor 37 is disposed on the outer side wall of the funnel-shaped guiding device 35.

It can be understood that, by the soft connecting tube 36 and the vibration motor 37, the funnel-shaped guiding device 35 can be driven by the vibration motor 37 to accelerate the falling speed of the filter residue and avoid clogging.

Preferably, referring to FIG. 3, in the embodiment of the present application, a plurality of sets of buffering devices 38 are further disposed between the funnel-shaped guiding device 35 and the solid inlet 271.

Preferably, referring to FIG. 3, in the embodiment of the present application, the buffer device 38 includes an upper connecting block 39, a lower connecting block 40, and a spring 41 vertically disposed between the upper connecting block 39 and the lower connecting block 40. The upper connecting block 39 Connected to the outer side wall of the funnel-shaped guiding device 35, the lower connecting block 40 is connected to the top of the filter collection washing pool 27.

It can be understood that, by using the above-mentioned buffer device, the vibration motor 37 can be effectively prevented from vibrating during the vibration of the funnel-shaped guiding device 35, and the vibration amplitude is too large to cause the soft connection to fall off, thereby ensuring that the filter residue smoothly enters the solid inside the filter residue collection cleaning tank 27. On the slide 29.

Preferably, referring to FIG. 1 , in the embodiment of the present application, the concentrated water filter port 4 is provided with a twelfth valve 25 . The concentrated water outlet of the concentrated filtration device 4 is in communication with the spent acid storage tank 1.

It can be understood that the filtered concentrate discharged through the concentrated water outlet of the concentrated filtering device 4 can be recycled to the waste acid storage tank 1 for secondary treatment to avoid waste of resources and direct discharge of polluted environment.

The above valve can be an electric control valve or a solenoid valve, so that the entire system is fully automatic controlled, no manual operation is required, and labor intensity and danger are reduced.

The specific process flow of the solid-liquid separation system is:

First opening the first valve 6, the seventh valve 17, and the eleventh valve 22, closing the second valve 7, the third valve 9, the fourth valve 12, the fifth valve 14, and the sixth valve 16, starting the first suction The pump 8 pumps the waste acid liquid in the spent acid storage tank 1 to the filter press 3 for pressure filtration, and the filtered filtrate is discharged into the intermediate tank 23.

After running for a period of time, the waste residue generated by the pressure filtration is saturated in the filter press 3, at which time the first valve 6 is closed and the first suction pump 8 is closed, the fifth valve 14 is opened, and compressed air is introduced to make the pipeline The spent acid solution in the suction pump 8 and in the filter press 3 is all discharged into the intermediate tank 23 under the action of the differential pressure.

Then, the fifth valve 14 and the eleventh valve 22 are closed, the second valve 7 and the fourth valve 12 are opened, and the first suction pump 8 is turned on, and the water pump in the clean water tank 2 is put into the filter press 3, and the flushing pressure is applied. The filter residue in the filter 3 is then discharged into the waste water tank 11 by flushing the waste water.

After the above flushing is completed, the second valve 7 is closed and the first suction pump 8 is closed, the fifth valve 14 is opened, and compressed air is introduced to make the waste water in the pipeline, the first suction pump 8 and the filter press 3 All of the discharge into the wastewater tank 11 is driven by the differential pressure.

Then, the fifth valve 14, the fourth valve 12 and the seventh valve 17 are closed, the sixth valve 16 is opened, compressed air is introduced, and the residual filter residue in the filter press 3 is completely discharged from the filter residue outlet of the filter press 3 to the filter residue recovery. In the processing device 26.

The above process is repeated. When the liquid level in the intermediate tank 23 reaches the set liquid level, the third valve 9, the tenth valve 21 and the ninth valve 20 are opened, the eighth valve 19 and the twelfth valve 25 are closed, and the second valve is opened. The suction pump 10 pumps the waste acid in the intermediate tank 23 into the concentration filter unit 4 for further filtration, and the filtered acidic water is discharged into the collection tank 5.

After running for a period of time, the third valve 9, the tenth valve 21 and the ninth valve 20 are closed, the second suction pump 10 is closed, the eighth valve 19 and the twelfth valve 25 are opened, and compressed air is introduced to concentrate the filtration. The concentrate in the apparatus is discharged from the concentrated water outlet of the filtration concentrating unit to the waste acid storage tank 1 for recycling.

In summary, the beneficial effects of the solid-liquid separation system of the present application are:

Although the term structure is used more often, such as "waste acid reservoir", "concentrated filtration device", "collection pool", etc., the possibility of using other terms is not excluded. These terms are only used to more easily describe and explain the nature of the application; any of these additional limitations are inconsistent with the spirit of the application.

The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, and should cover Within the scope of protection of this application.

Industrial applicability

The solid-liquid separation system provided by the embodiment of the present application does not need to replace the filter element and does not cause clogging, which can save cost and prolong the service life of the filter press. The solid and liquid obtained by the separation of the system can be recycled, not only realize The zero pollutant discharge effectively reduces the processing cost and load, and solves the problem of waste of resources, and greatly reduces the production and processing costs of the enterprise, and has industrial applicability.

Claims

A solid-liquid separation system, comprising: a waste acid storage tank, a clear water tank, a filter press, a concentrated filtering device and a collecting tank;

The waste acid storage tank and the clean water tank are both connected to the liquid inlet of the filter press through a first suction pump, and the water outlet of the waste acid storage tank is provided with a first valve, and the clear water tank a second valve is provided at the water outlet;

The water outlet of the filter press is connected to the liquid inlet of the concentrated filter device through a second suction pump, and the inlet of the second suction pump is provided with a third valve;

The water clearing port of the concentrated filtering device is in communication with the collecting pool;

The water outlet of the filter press is also connected to a wastewater tank, and the inlet of the wastewater tank is provided with a fourth valve.
A solid-liquid separation system according to claim 1, further comprising: a first compressed air generating device, said first compressed air generating device being connected to a liquid inlet of said filter press through a first suction pump The air outlet of the first compressed air generating device is provided with a fifth valve.
The solid-liquid separation system according to claim 1 or 2, further comprising a second compressed air generating device, wherein a water outlet of the filter press is in communication with the second compressed air generating device, the second A sixth valve is provided at the air outlet of the compressed air generating device.
The solid-liquid separation system according to any one of claims 1 to 3, characterized in that the liquid inlet of the filter press is provided with a seventh valve.
The solid-liquid separation system according to any one of claims 1 to 4, further comprising a third compressed air generating device, wherein the water clearing port of the concentrated filtering device is in communication with the third compressed air generating device The air outlet of the third compressed air generating device is provided with an eighth valve, and the inlet of the collecting pool is provided with a ninth valve.
The solid-liquid separation system according to any one of claims 1 to 5, characterized in that the liquid inlet of the concentrated filtration device is provided with a tenth valve.
The solid-liquid separation system according to any one of claims 1 to 6, wherein an intermediate pool is provided between the water outlet of the filter press and the inlet of the second suction pump, the middle The eleventh valve is located at the entrance of the pool.
The solid-liquid separation system according to claim 7, wherein a liquid level gauge is disposed in said intermediate tank.
The solid-liquid separation system according to any one of claims 1 to 8, further comprising a filter residue recovery processing device, wherein the filter residue outlet of the filter press is in communication with the filter residue recovery treatment device.
The solid-liquid separation system according to claim 9, wherein the filter residue recovery treatment device comprises a filter residue collection cleaning tank and a filter residue storage tank;

a solid inlet is opened at a top of the filter collection and cleaning tank, and a solid outlet is opened on a sidewall of the filter collection and cleaning tank, and one end of the filter collection and cleaning tank is provided with a connection with the solid inlet, and another a sloped solid slide at one end in communication with the solids outlet;

The solid slide includes a frame portion and a sieve disposed on the frame portion;

a water spray device is disposed on the inner top of the filter residue collection and cleaning tank, the water spray device is configured to spray clean water to the solid slide, and a liquid outlet is opened at the bottom of the filter collection and cleaning pool;

The solids outlet is in communication with the filter residue storage tank.
The solid-liquid separation system according to claim 10, wherein said liquid outlet is in communication with said liquid inlet of said concentrated filtration device through said second suction pump.
The solid-liquid separation system according to claim 10 or 11, wherein the water inlet of the fresh water sprinkler is connected to the water outlet of the clear water tank through a third suction pump, and the water spray device is The thirteenth valve is provided on the water inlet.
The solid-liquid separation system according to any one of claims 10 to 12, wherein the filter residue storage tank has a drying device, and the drying device includes a top portion disposed on the top of the filter residue storage tank A hot air blower inside the filter residue storage tank.
The solid-liquid separation system according to any one of claims 10 to 13, characterized in that the residue collection and cleaning tank further has a purging device capable of purging the filter residue on the solid slide.
The solid-liquid separation system according to claim 14, wherein said purging means comprises a gas source and a high-pressure air gun connected to said gas source, and an air outlet of said high-pressure air gun is aligned with said solid inlet.
The solid-liquid separation system according to any one of claims 10 to 15, characterized in that the solid inlet is provided with a funnel-shaped guiding means whose diameter gradually decreases from top to bottom.
The solid-liquid separation system according to claim 16, wherein said funnel-shaped guiding means is connected to a side of said solid inlet through a soft connecting pipe, and is disposed on an outer side wall of said funnel-shaped guiding means There is a vibration motor.
The solid-liquid separation system according to claim 17, wherein a plurality of sets of cushioning means are further disposed between said funnel-shaped guiding means and said solid inlet.
The solid-liquid separation system according to claim 18, wherein said buffering means comprises an upper connecting block, a lower connecting block, and a spring vertically disposed between said upper connecting block and said lower connecting block, The connecting block is connected to the outer side wall of the funnel-shaped guiding device, and the lower connecting block is connected to the top of the filter collecting and cleaning pool.
The solid-liquid separation system according to any one of claims 1 to 19, wherein the concentrated water filtering port of the concentrated filtering device is provided with a twelfth valve, the concentrated water port of the concentrated filtering device and the waste acid The pool is connected.