CN109865325A - A kind of sewage disposal system and its working method - Google Patents
A kind of sewage disposal system and its working method Download PDFInfo
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- CN109865325A CN109865325A CN201711269336.8A CN201711269336A CN109865325A CN 109865325 A CN109865325 A CN 109865325A CN 201711269336 A CN201711269336 A CN 201711269336A CN 109865325 A CN109865325 A CN 109865325A
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Abstract
The present invention relates to a kind of sewage disposal system and its working method, the sewage disposal system includes: control module, the first water quality detection subsystem and filter subsystem being connected with the control module；Wherein the first water quality detection subsystem is adapted to detect for the water quality parameter of source of sewage, and the water quality parameter that will test is sent to control module；If the water quality parameter detected determines that water quality is normal, otherwise source of sewage is connected with filter subsystem, so that sewage is filtered processing through filter subsystem better than the water standard of setting；Sewage disposal system of the invention detects the water quality situation of source of sewage by the first water quality detection subsystem, according to the water quality situation of source of sewage, judge that the source of sewage need to not need not only save cost of sewage disposal by filter subsystem filtration treatment, sewage treating efficiency can also be improved.
Description
Technical field
The present invention relates to environmental technology fields, and in particular to a kind of sewage disposal system and its working method.
Background technique
With the development of science and technology, sewage disposal technology is more and more mature, wherein filter press as a kind of ideal sewage at
Equipment is managed, is more and more widely used in field of industrial production.
Currently, in most cases, source of sewage is directly connected with filter press, it is filtered processing, not to source of sewage
Water quality is detected, if source of sewage water quality is good, does not need to be filtered it processing, can direct recycling and reusing, this
Sample has not only saved cost of sewage disposal, also improves sewage treating efficiency；Sewage disposal system can not be to filters pressing at present simultaneously
The effluent quality of machine is effectively detected, and can not judge whether filters pressing water can be used to recycle, and if underproof
Drainage is by direct emission, it will very big influence is caused to environment.
Summary of the invention
The object of the present invention is to provide a kind of sewage disposal system and its working methods.
In order to solve the above-mentioned technical problems, the present invention provides a kind of sewage disposal systems, comprising: control module, with this
The first connected water quality detection subsystem of control module and filter subsystem；Wherein the first water quality detection subsystem is suitable for inspection
The water quality parameter of source of sewage is surveyed, and the water quality parameter that will test is sent to control module；If the water quality parameter detected is better than
The water standard of setting then determines that water quality is normal, otherwise source of sewage is connected with filter subsystem, so that sewage passes through filter system
System is filtered processing.
Further, the sewage disposal system further include the second water quality detection subsystem being connected with the control module and
Alarm module；Wherein the second water quality detection subsystem is adapted to detect for sewage through the filtered water quality parameter of filter subsystem；
If the water quality parameter detected is worse than the water standard of setting, alarm module issues alarm.
Further, the filter subsystem includes filter press；The filter press includes: bracket, and on the bracket
One driving device, filter device and limiting device；Wherein the filter device includes: drainage channel and the two sides that are oppositely arranged
Plate；The both side plate is equipped with filter cloth, to form filtering chamber；Extendible knockout pin is wherein additionally provided on side plate and can with this
The second connected driving device of flexible mandril；First, second driving device is controlled by the control module；And when dirt
After water enters filtering chamber, the first driving device drives the filter device mobile towards limiting device, to compress filtering
Device penetrates into drainage to drainage channel through filter cloth；If filter cloth blocks, second driving device drives retractable top
Bar is stretched out towards another side plate direction, to increase the spacing of both side plate, makes the drainage in drainage channel through filter cloth by resorption to mistake
When in filter chamber room, the attachment on filter cloth is washed away.
Further, the upper end of each side plate is equipped with upward extension, and lower end is equipped with downward extension；The retractable top
Bar is four, is located at four vertex of side plate.
Further, wherein side plate be equipped with water inlet, another side plate be equipped with water outlet, the sewage from it is described enter water
Mouth enters filtering chamber.
Further, the pressure sensor being connected with the control module is equipped in the filtering chamber；The pressure sensing
Device is located at the top of the water inlet, and is suitable for the indoor pressure value of real-time detection filter chamber；When the indoor pressure value of filter chamber
When pressure threshold beyond setting, the control module controls the second driving device and drives Extendible knockout pin towards another side plate side
To stretching, to increase the spacing of both side plate, when making the drainage in drainage channel through filter cloth by resorption to filtering chamber, wash away
Attachment on filter cloth.
Further, the water inlet is equipped with a check valve, to prevent the sewage in filtering chamber from flowing backwards from water inlet
It goes out.
Further, the filtering chamber is several；The filtering chamber is connected by a connecting rod between any two, and
The water outlet of one filtering chamber is connected with the water inlet of another filtering chamber；When sewage enters water from first filtering chamber
After mouth enters in first filtering chamber, when sewage highly is more than water outlet, the sewage is flowed into down from the water outlet
In one filtering chamber, and so on, until being marked with sewage in all filtering chamber.
Further, the drainage channel includes the drip chamber between Liang Ge filtering chamber；The drip chamber is equipped with row
The mouth of a river, the discharge outlet are connected by a drainage pipeline with collecting-tank；After water sewage enters filtering chamber, the first driving dress
It is mobile towards limiting device to set the driving filter device, to compress filter device, penetrates into drainage to drip chamber through filter cloth,
It is flowed into collecting-tank from discharge outlet through drainage pipeline again.
Another aspect, the present invention also provides a kind of working methods of sewage disposal system, comprising: control module, with this
The first connected water quality detection subsystem of control module and filter subsystem；Wherein the first water quality detection subsystem is suitable for inspection
The water quality parameter of source of sewage is surveyed, and the water quality parameter that will test is sent to control module；If the water quality parameter detected is better than
The water standard of setting then determines that water quality is normal, otherwise source of sewage is connected with filter subsystem, so that sewage passes through filter system
System is filtered processing.
The invention has the advantages that sewage disposal system of the invention detects sewage by the first water quality detection subsystem
The water quality situation in source judges that the source of sewage need to not needed through filter subsystem filtration treatment according to the water quality situation of source of sewage,
Cost of sewage disposal can be not only saved, sewage treating efficiency can also be improved.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the functional block diagram of sewage disposal system of the invention；
Fig. 2 is the structural schematic diagram of the filter press in sewage disposal system of the invention；
Fig. 3 is the structural schematic diagram of the two of them filtering chamber of the filter press in sewage disposal system of the invention.
Wherein:
Bracket 1, filter device 3, filtering chamber 31, filter cloth 32, the first side plate 331, the first side plate 332, enters water at driving device 2
Mouth 341, water outlet 342, drip chamber 35, discharge outlet 350, check valve 36, pressure sensor 37, Extendible knockout pin 38, second drive
Dynamic device 39, limiting device 4, water inlet line 5, drainage pipeline 6, collecting-tank 7.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
Embodiment 1
Fig. 1 is the functional block diagram of sewage disposal system of the invention；
Fig. 2 is the structural schematic diagram of the filter press in sewage disposal system of the invention；
Fig. 3 is the structural schematic diagram of the two of them filtering chamber of the filter press in sewage disposal system of the invention.
As shown in Figure 1, Figure 2 and Figure 3, the present embodiment 1 provides a kind of sewage disposal system, comprising: control module, with this
The first connected water quality detection subsystem of control module and filter subsystem；Wherein the first water quality detection subsystem is suitable for inspection
The water quality parameter of source of sewage is surveyed, and the water quality parameter that will test is sent to control module；If the water quality parameter detected is better than
The water standard of setting then determines that water quality is normal, if being worse than the water standard of setting, by source of sewage and filter subsystem phase
Even, so that sewage is filtered processing through filter subsystem.
Optionally, the water quality parameter of the source of sewage is such as, but not limited to the pH value of sewage, the turbidity of sewage, sewage
COD value etc.；The water standard can be set according to national related environmental requirement, can also be according to the need of those skilled in the art
It is set, and the water standard of those skilled in the art's setting is not higher than the water standard of national requirements；First water
Quality detection subsystem is such as, but not limited to include COD sensor, turbidity of sewage sensor, PH sensor.
Optionally, the COD sensor such as, but not limited to uses H5B-2F type COD sensor；The turbidity of sewage passes
Sensor such as, but not limited to uses BZ-1Z type turbidity of sewage sensor；The PH sensor such as, but not limited to uses JG-PH-
485 type PH sensors.
The sewage disposal system of the present embodiment can detect the pollution condition of source of sewage in advance, if the water quality of source of sewage is good
It is good, then filter system filtration treatment is needed not move through, directly can recycle or discharge；If the water quality of source of sewage is poor, then
By filter subsystem filtration treatment, cost of sewage disposal not only can be saved, and then can be improved sewage treating efficiency.
The sewage disposal system further includes the second water quality detection subsystem being connected with the control module and alarm mould
Block；Wherein the second water quality detection subsystem is adapted to detect for sewage through the filtered water quality parameter of filter subsystem；If detection
To water quality parameter be worse than the water standard of setting, then alarm module issues alarm.
Optionally, the second water quality detection subsystem such as, but not limited to includes COD sensor, turbidity of sewage sensing
Device, PH sensor；The alarm module is such as, but not limited to combined aural and visual alarm, in order to remind the people of surrounding；Pass through second
Water quality detection subsystem detects the water quality parameter after filter subsystem filtration treatment, to judge through filter subsystem filtration treatment
Whether sewage afterwards can be with direct emission, it is desired nonetheless to which subsequent processing prevents sewage not up to standard from misprinting and runs out, influences ring
Border.
Filter press has obtained more and more extensive as a kind of ideal suspension solid-liquid separating equipment in field of industrial production
Application.Therefore, the filter subsystem of the present embodiment includes filter press.
But in practical applications, the filter cloth of filter press is easy blocking, and filter cloth gradually blocks, when filter cloth blocks one
When part, although water still can be discharged, need to waste a large amount of energy；Currently used Conventional cleaning method is:
It is thoroughly cleaned using the automatic high pressure cleaning device that filter press is subsidiary due to the difference of filter medium after filter press has worked
Period and the complexity of cleaning will be different, need the artificial stopping state to filter cloth to be monitored, take time and effort,
And it is once completely plugged during the work time, then it is very troublesome.
Therefore, in order to solve the problems, such as that filter cloth is easy to happen blocking to filter press at work, the filter press includes: bracket
1, first driving device 2, filter device 3 and limiting device 4 on the bracket 1；Wherein the filter device 3 includes: row
Aquaporin and the both side plate being oppositely arranged；The both side plate is equipped with filter cloth 32, to form filtering chamber 31；Wherein on side plate
The second driving device 39 for being additionally provided with Extendible knockout pin 38 and being connected with the Extendible knockout pin；First, second driving device
It is controlled by the control module；And after sewage enters filtering chamber, the first driving device 2 drives the filtering to fill
3 are set towards the movement of limiting device 4, to compress filter device 3, penetrates into drainage to drainage channel through filter cloth 32；If filter cloth 32
It blocks, second driving device 39 drives Extendible knockout pin 38 to stretch out towards another side plate direction, to increase both side plate
Spacing wash away the attachment on filter cloth 32 when making the drainage in drainage channel through filter cloth 32 by resorption to filtering chamber 31
Object.
Specifically, the first driving device 2 such as, but not limited to uses hydraulic pump；The limiting device 4 is for example but not
It is limited to the limit plate being vertically arranged；Both side plate is the first side plate 331 and the second side plate 332, and the Extendible knockout pin 38 can be with
It is located on the first side plate 331, can also be located on the second side plate 332, the present embodiment is arranged with Extendible knockout pin 38 in the first side
For on plate 331.
The upper end of each side plate is equipped with upward extension, and lower end is equipped with downward extension；The Extendible knockout pin is four
It is a, it is located at four vertex of side plate.
Specifically, Extendible knockout pin 38 is corroded in sewage in order to prevent, the upper end of each side plate is equipped with prolongs upwards
Long portion, lower end are equipped with downward extension, so that the Extendible knockout pin 38 is arranged on extension.
Specifically, the Extendible knockout pin 38 is such as, but not limited to four, and it is separately positioned on the four of the first side plate 331
A vertex；The Extendible knockout pin 38 can resist the second side plate 332, with the increasing of extension elongation during stretching
Add, the second side plate 332 can be pushed mobile, to increase the distance between the first side plate 331 and the second side plate 332, pass through setting
Four mandrils, can be such that second side plate 332 is more uniformly stressed, to prevent 332 discontinuity of second side plate and run-off the straight,
It causes to move unsmooth.
Wherein side plate is equipped with water inlet, and another side plate is equipped with water outlet, and the sewage enters from the water inlet
Filtering chamber.
Specifically, in the present embodiment, the water inlet 341 is located on the first side plate 331, the water outlet 342 is located at
On second side plate 332；The sewage enters in filtering chamber 31 through water inlet line 5 from the water inlet 341.
The pressure sensor 37 being connected with the control module is equipped in the filtering chamber 31；The pressure sensor 37
Positioned at the top of the water inlet 341, and the pressure value being suitable in real-time detection filtering chamber 31；Pressure in filtering chamber 31
Force value beyond setting pressure threshold when, the control module controls the second driving device 39 and drives Extendible knockout pin 38 towards another
Side plate direction is stretched out, and to increase the spacing of both side plate, makes the drainage in drainage channel through filter cloth 32 by resorption to filtering chamber
When interior, the attachment on filter cloth 32 is washed away.
Specifically, the pressure sensor 37 is located at the top of the water inlet 341, the sludge etc. in sewage can be prevented
Impurity adheres to the surface of pressure sensor, and pressure value can not accurately be detected by causing stress sensor；The pressure threshold of the setting
Value is such as, but not limited to 0.3MPA-3MPA, and those skilled in the art can be according to the pressure of the actual state appropriate adjustment setting
Force threshold.
In the present embodiment, the indoor pressure value of filter chamber detected in order to ensure pressure sensor is accurate, described
A check valve 36 is equipped at the water inlet 341 of filtering chamber 31, to prevent the sewage in filtering chamber 31 from falling from water inlet 341
Stream outflow, and cause the pressure value inaccuracy in filtering chamber 31.
The filtering chamber 31 is several；The filtering chamber is connected by a connecting rod between any two, and one
The water outlet of filtering chamber is connected with the water inlet of another filtering chamber；When sewage from the water inlet of first filtering chamber into
After entering in first filtering chamber, when sewage highly is more than water outlet, the sewage flows into from the water outlet next
In filtering chamber, and so on, until being marked with sewage in all filtering chamber.
Specifically, the filtering chamber of water inlet line 5 will be positioned close to as first filtering chamber, the sewage pass through into
Waterpipe 5 enters first filtering chamber from the water inlet of first filtering chamber, when the sewage highly of injection is more than water outlet
When, continue to inject sewage, sewage is made to flow into next filtering chamber from water outlet, and so on, until in the filtering chamber
It is marked with sewage, then stops injecting sewage.
Optionally, the water outlet of a filtering chamber and the water inlet of another filtering chamber such as, but not limited to pass through soft
Pipe is connected.
The drainage channel includes the drip chamber 35 between Liang Ge filtering chamber；The drip chamber 35 is equipped with discharge outlet
350, which is connected by a drainage pipeline 6 with collecting-tank 7；After sewage enters filtering chamber 31, described first is driven
Dynamic device 2 drives the filter device 3 mobile towards limiting device 4, to compress filter device 3, penetrates into drainage through filter cloth 32
It is flowed into collecting-tank 7 to drip chamber 35, then from discharge outlet 350 through drainage pipeline 6.
The high point of the drainage pipeline 6 is higher than the top of filter device 3；It is previously provided with water in the collecting-tank 7, and makes institute
The outlet for stating drainage pipeline 6 is located at underwater, to drive corresponding Extendible knockout pin 38 to stretch out in the second driving device 2, to increase
When the spacing of big first side plate 331 and the second side plate 332, there is enough water that can be back to through drainage pipeline 6 in collecting-tank 7
In filter chamber room, to wash away the attachment on filter cloth 32.
The working principle of the filter press of the present embodiment is as follows:
Sewage is pumped into first filtering chamber by water inlet line 5, and continues to inject, until all filtering chamber infuse
There is sewage；Then controlling first driving device 2 by control module drives filter device 3 mobile towards limiting device 4, to compress
Filter device 3 penetrates into drainage to drip chamber 35 through filter cloth 32, then flows into collecting-tank 7 from discharge outlet 350 through drainage pipeline 6
Interior, filter residue is then stopped by filter cloth 32 and stays in filtering chamber；If the filter cloth of any filtering chamber blocks, with the first drive
Dynamic device 2 constantly compresses filter device 3, and the indoor drainage of the filter chamber blocked can not be oozed out or be oozed out very slowly, makes the mistake
The indoor pressure of filter chamber constantly increases, when the indoor pressure sensor of the filter chamber detects that pressure increases to the pressure beyond setting
When force threshold, then control module controls the second driving device 39 and drives the corresponding stretching of Extendible knockout pin 38, to increase the first side
The spacing of plate 331 and the second side plate 332 makes the filtering chamber generate negative pressure, by the water in collecting-tank 7 successively through drainpipe
Road, drip chamber, filter cloth are sucked into filtering chamber, and during water reflux, water can wash away attached on filter cloth from the negative
Enter in filtering chamber after object, that is, solve the blockage problem of filter cloth, during water reflux, make corresponding retractable top
Bar keeps stretching state for a period of time (such as 5-30s), then drives corresponding Extendible knockout pin contracting by the second driving device again
It returns, so that first driving device 2 continues to drive filter device 3 mobile towards limiting device 4, until all drainages are discharged.
The filter press of the present embodiment can be stretched when the filter cloth of any filtering chamber is blocked by driving accordingly
Contracting mandril stretches out, and increases the spacing of both side plate, so that the filtering chamber blocked is generated negative pressure, so that the water in collecting-tank be made to fall
Stream, the water of refluence enters in filtering chamber after washing away the attachment on filter cloth from the negative, to solve asking for filter cloth blocking
Topic, while during solving blockage problem, it will not influence other filtering chamber not blocked, substantially increase work
Efficiency；The filter press of the present embodiment can ensure that filter cloth remains logical by simple anti-blockage structure during the work time
Smooth state, further improves working efficiency.
The working condition of filter press can be judged by the second water quality detection module, and it is repeated can effectively to prevent filter cloth
Use the technical issues of causing the filter effect of filter press to decline.
Embodiment 2
On the basis of embodiment 1, the present embodiment 2 provides a kind of working method of sewage disposal system, comprising: control mould
Block, the first water quality detection subsystem and filter subsystem being connected with the control module；Wherein the first water quality detection subsystem
System is adapted to detect for the water quality parameter of source of sewage, and the water quality parameter that will test is sent to control module；If the water quality detected
Parameter then determines that water quality is normal, otherwise source of sewage is connected with filter subsystem better than the water standard of setting, so that sewage passes through
Filter subsystem is filtered processing.
Sewage disposal system has been described in detail in embodiment 1 in the present embodiment, is not repeating herein.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (10)
1. a kind of sewage disposal system characterized by comprising
Control module, the first water quality detection subsystem and filter subsystem being connected with the control module；Wherein
The first water quality detection subsystem is adapted to detect for the water quality parameter of source of sewage, and the water quality parameter that will test is sent to
Control module；
If the water quality parameter detected determines that water quality is normal better than the water standard of setting, otherwise by source of sewage and filter excessively
System is connected, so that sewage is filtered processing through filter subsystem.
2. sewage disposal system according to claim 1, which is characterized in that
The sewage disposal system further includes the second water quality detection subsystem and alarm module being connected with the control module；Its
In
The second water quality detection subsystem is adapted to detect for sewage through the filtered water quality parameter of filter subsystem；
If the water quality parameter detected is worse than the water standard of setting, alarm module issues alarm.
3. sewage disposal system according to claim 1 or 2, which is characterized in that
The filter subsystem includes filter press；
The filter press includes:
Bracket, first driving device, filter device and limiting device on the bracket；Wherein
The filter device includes: drainage channel and the both side plate that is oppositely arranged；
The both side plate is equipped with filter cloth, to form filtering chamber；
The second driving device for being wherein additionally provided with Extendible knockout pin on side plate and being connected with the Extendible knockout pin；
First, second driving device is controlled by the control module；And
After sewage enters filtering chamber, the first driving device drives the filter device mobile towards limiting device, with
Filter device is compressed, penetrates into drainage to drainage channel through filter cloth；
If filter cloth blocks, the second driving device driving Extendible knockout pin is stretched out towards another side plate direction, to increase
The spacing of both side plate washes away the attachment on filter cloth when making the drainage in drainage channel through filter cloth by resorption to filtering chamber
Object.
4. sewage disposal system according to claim 3, which is characterized in that
The upper end of each side plate is equipped with upward extension, and lower end is equipped with downward extension；
The Extendible knockout pin is four, is located at four vertex of side plate.
5. sewage disposal system according to claim 4, which is characterized in that
Wherein side plate is equipped with water inlet, and another side plate is equipped with water outlet, and the sewage enters filtering from the water inlet
Chamber.
6. sewage disposal system according to claim 5, which is characterized in that
The pressure sensor being connected with the control module is equipped in the filtering chamber；
The pressure sensor is located at the top of the water inlet, and is suitable for the indoor pressure value of real-time detection filter chamber；
When pressure threshold of the indoor pressure value of filter chamber beyond setting, the control module controls the driving of the second driving device
Extendible knockout pin is stretched out towards another side plate direction, to increase the spacing of both side plate, makes the drainage in drainage channel through filter cloth quilt
When in resorption to filtering chamber, the attachment on filter cloth is washed away.
7. sewage disposal system according to claim 6, which is characterized in that
The water inlet is equipped with a check valve, to prevent the sewage in filtering chamber from flowing backwards away from water inlet.
8. sewage disposal system according to claim 7, which is characterized in that
The filtering chamber is several；
The filtering chamber is connected by a connecting rod between any two, and the water outlet of a filtering chamber and another filtering
The water inlet of chamber is connected；
It is more than water outlet in sewage highly after sewage enters in first filtering chamber from the water inlet of first filtering chamber
When, the sewage flows into next filtering chamber from the water outlet, and so on, until being infused in all filtering chamber
There is sewage.
9. sewage disposal system according to claim 8, which is characterized in that
The drainage channel includes the drip chamber between Liang Ge filtering chamber；
The drip chamber is equipped with discharge outlet, which is connected by a drainage pipeline with collecting-tank；
After water sewage enters filtering chamber, the first driving device drives the filter device mobile towards limiting device,
It to compress filter device, penetrates into drainage to drip chamber through filter cloth, then is flowed into collecting-tank from discharge outlet through drainage pipeline.
10. a kind of working method of sewage disposal system characterized by comprising
Control module, the first water quality detection subsystem and filter subsystem being connected with the control module；Wherein
The first water quality detection subsystem is adapted to detect for the water quality parameter of source of sewage, and the water quality parameter that will test is sent to
Control module；
If the water quality parameter detected determines that water quality is normal better than the water standard of setting, otherwise by source of sewage and filter excessively
System is connected, so that sewage is filtered processing through filter subsystem.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711269336.8A CN109865325A (en) | 2017-12-05 | 2017-12-05 | A kind of sewage disposal system and its working method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711269336.8A CN109865325A (en) | 2017-12-05 | 2017-12-05 | A kind of sewage disposal system and its working method |
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| Publication Number | Publication Date |
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| CN109865325A true CN109865325A (en) | 2019-06-11 |
Family
ID=66916602
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711269336.8A Withdrawn CN109865325A (en) | 2017-12-05 | 2017-12-05 | A kind of sewage disposal system and its working method |
Country Status (1)
| Country | Link |
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| CN (1) | CN109865325A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113877306A (en) * | 2021-11-17 | 2022-01-04 | 东营天润石化科技有限公司 | Cleaning method of filter cloth of filter press for chemical sludge treatment |
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Application publication date: 20190611 |
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| WW01 | Invention patent application withdrawn after publication |