CN215439974U - Pharmaceutical chemical wastewater comprehensive pretreatment system - Google Patents
Pharmaceutical chemical wastewater comprehensive pretreatment system Download PDFInfo
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- CN215439974U CN215439974U CN202121573085.4U CN202121573085U CN215439974U CN 215439974 U CN215439974 U CN 215439974U CN 202121573085 U CN202121573085 U CN 202121573085U CN 215439974 U CN215439974 U CN 215439974U
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- 239000000126 substance Substances 0.000 title claims abstract description 51
- 239000002351 wastewater Substances 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
- 239000012528 membrane Substances 0.000 claims abstract description 77
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 72
- 238000006243 chemical reaction Methods 0.000 claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 claims abstract description 35
- 239000006228 supernatant Substances 0.000 claims abstract description 32
- 238000011001 backwashing Methods 0.000 claims description 22
- 238000004140 cleaning Methods 0.000 claims description 22
- 238000001556 precipitation Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 239000004005 microsphere Substances 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 description 9
- 239000010802 sludge Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 6
- 239000003814 drug Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000002289 effect on microbe Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000012736 patent blue V Nutrition 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000011268 retreatment Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000003403 water pollutant Substances 0.000 description 1
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Abstract
The utility model discloses a comprehensive pretreatment system for pharmaceutical and chemical wastewater, which comprises a first reaction tank, a second reaction tank, a concentration tank, a filter, a tubular ultrafiltration membrane component and a water production tank, wherein a supernatant outlet at the upper part of the first reaction tank is communicated with an inlet of the second reaction tank, a supernatant outlet at the upper part of the second reaction tank is communicated with an inlet of the concentration tank, a supernatant outlet at the upper part of the concentration tank is communicated with the filter, an outlet of the filter is communicated with a water inlet of the tubular ultrafiltration membrane component, a concentrated water outlet of the tubular ultrafiltration membrane component returns to the concentration tank through a concentrated water return pipe, and a water production port is communicated with the water production tank through a water production pipe. The comprehensive pretreatment system for pharmaceutical and chemical wastewater is characterized in that the first reaction tank, the second reaction tank, the concentration tank, the filter and the tubular ultrafiltration membrane component are cooperatively used, so that the membrane blockage phenomenon is not easy to occur, the production efficiency is greatly improved, and the quality of produced water is stable.
Description
Technical Field
The utility model relates to the technical field of water treatment, in particular to a comprehensive pretreatment system for pharmaceutical and chemical wastewater.
Background
The environmental protection is a common concern of people at present, enhances the environmental awareness, places the environmental protection at the top priority to promote the construction of a good ecological environment, and has a beautiful home with sky blue, earth green and water purification.
In recent years, due to rapid development of industrialization, various pollutions are brought to the environment. Among various pollution, industrial wastewater is also important because industrial wastewater contains various substances harmful to the environment and human body and is difficult to treat, and therefore, it is necessary to reduce the emission of pollutants.
The pharmaceutical chemical wastewater has the characteristics of large amount, high salinity, complex organic components and the like, and the damage to the water environment is great, so that the pharmaceutical chemical wastewater is treated, and the water quality reaches the standard and then is discharged, thereby being beneficial to the ecological environment, indirectly influencing the living environment of people and realizing the green ecological environment.
For the pretreatment of pharmaceutical and chemical wastewater, the traditional process adopts a ceramic membrane method for filtration, namely, the pharmaceutical and chemical wastewater, the chemical dosing, the flocculation and the precipitation and the ceramic membrane filtration, and the process has the disadvantages of large occupied area, high power consumption and inconvenient operation and maintenance.
The ultrafiltration membrane is a filtration technology between microfiltration and nanofiltration, and can separate substances with different characteristics in a solution so as to achieve the aim of purifying water quality. The ultrafiltration technology can effectively isolate colloid substances, fine suspended particles and the like, has a certain removing effect on microorganisms, bacteria and other substances in water, and effectively purifies water quality. Ultrafiltration techniques have many advantages over traditional point-of-care techniques, such as: the process has the advantages of convenient operation, low energy consumption, good purification effect, recoverability and the like, and is widely applied to sewage treatment and purification at present.
The existing wastewater ultrafiltration treatment device generally comprises a softened water tank, a tubular ultrafiltration membrane component and a water production water tank, wherein a medicament is added into wastewater in the softened water tank, the wastewater enters the ultrafiltration membrane component for ultrafiltration treatment after flocculation and sedimentation, concentrated water flows back to the softened water tank, and purified water enters the water production water tank. Due to the complexity of the components of the pharmaceutical and chemical wastewater, membrane blockage and pollution are easily caused in the treatment process, so that frequent shutdown is caused to perform cleaning work such as backwashing, chemical cleaning and the like on the ultrafiltration membrane, and the production efficiency is greatly reduced, so that a more effective pharmaceutical and chemical wastewater comprehensive pretreatment system needs to be developed.
SUMMERY OF THE UTILITY MODEL
In order to more effectively treat the pharmaceutical and chemical wastewater to meet the discharge requirement or further treat the pharmaceutical and chemical wastewater subsequently to achieve the purpose of recycling, the utility model aims to provide a pharmaceutical and chemical wastewater comprehensive pretreatment system with high production efficiency, stable water quality of produced water and low cost.
The above purpose of the utility model is realized by the following technical scheme:
the utility model provides a pharmaceutical chemical wastewater comprehensive pretreatment system, which comprises a first reaction tank, a second reaction tank, a concentration tank, a filter, a tubular ultrafiltration membrane component and a water production tank, wherein:
the first reaction tank comprises a raw water inlet, an upper supernatant outlet and a bottom concentrated water outlet;
the second reaction tank comprises an inlet, an upper supernatant outlet and a bottom concentrated water outlet, and the inlet of the second reaction tank is communicated with the upper supernatant outlet of the first reaction tank;
the concentration tank comprises an inlet, an upper supernatant outlet and a bottom concentrated water outlet, the inlet of the concentration tank is communicated with the upper supernatant outlet of the second reaction tank, and the upper supernatant outlet of the concentration tank is communicated with the filter through a circulating pump;
the outlet of the filter is communicated with the water inlet of the tubular ultrafiltration membrane component, the concentrated water outlet of the tubular ultrafiltration membrane component returns to the concentration tank through a concentrated water return pipe, and the water production port of the tubular ultrafiltration membrane component is communicated with the water production tank through a water production pipe;
and the bottom concentrated water outlet of the first reaction tank, the bottom concentrated water outlet of the second reaction tank and the bottom concentrated water outlet of the concentration tank are converged to a precipitation mud tank through connecting pipes, and the precipitation mud tank is communicated to a plate-and-frame filter press.
Advantageous effects
The comprehensive pretreatment system for pharmaceutical and chemical wastewater provided by the utility model can more effectively carry out comprehensive pretreatment on the pharmaceutical and chemical wastewater, and is mainly shown in the following steps: the comprehensive pretreatment system for pharmaceutical and chemical wastewater comprises a first reaction tank, a second reaction tank and a concentration tank, wherein different medicaments are added into the first reaction tank and the second reaction tank for reaction, so that the generation of precipitates is promoted more fully; after the three-step sedimentation, when the sludge passes through the filter, the filter comprises an upper layer of filtering screen and a lower layer of filtering screen and a porous activated carbon microsphere layer arranged between the filtering screens, so that a part of sludge can be filtered out and some organic matters can be adsorbed, and the treatment load of a next step tubular ultrafiltration membrane component is reduced; and the produced water is stable in quality and is not easy to have membrane blockage through a tubular ultrafiltration membrane component, so that the times of backwashing and cleaning are reduced, and the production efficiency is effectively improved.
Drawings
FIG. 1 is a schematic structural diagram of a comprehensive pretreatment system for pharmaceutical and chemical wastewater according to the present invention;
FIG. 2 is a schematic structural diagram of a comprehensive pretreatment system for pharmaceutical and chemical wastewater, which comprises an ultrafiltration membrane backwashing unit and an ultrafiltration membrane cleaning unit.
Description of the main reference numerals:
a first reaction tank: 1 second reaction tank: 2, a concentration tank: 3
A filter: 4, a tubular ultrafiltration membrane component: 5, a water producing pool: 6
A sedimentation mud tank: 7, plate and frame filter press: 8, cleaning the water tank: 9
Circulating pump: 10, cleaning a pump: 11, backwashing pump: 12
Detailed Description
The integrated pretreatment system for pharmaceutical and chemical wastewater according to the present invention will be described in more detail with reference to the accompanying drawings.
Fig. 1 schematically shows the structure of the integrated pretreatment system for pharmaceutical and chemical wastewater of the present invention, and fig. 1 is only a schematic structural view and does not reflect the precise dimensions of the components thereof. The utility model provides a comprehensive pretreatment system for pharmaceutical and chemical wastewater, which comprises a first reaction tank 1, a second reaction tank 2, a concentration tank 3, a filter 4, a tubular ultrafiltration membrane component 5 and a water production tank 6, wherein:
the first reaction tank 1 comprises a raw water inlet, an upper supernatant outlet and a bottom concentrated water outlet;
the second reaction tank 2 comprises an inlet, an upper supernatant outlet and a bottom concentrated water outlet, and the inlet of the second reaction tank 2 is communicated with the upper supernatant outlet of the first reaction tank 1;
the concentration tank 3 comprises an inlet, an upper supernatant outlet and a bottom concentrated water outlet, the inlet of the concentration tank 3 is communicated with the upper supernatant outlet of the second reaction tank 2, and the upper supernatant outlet of the concentration tank 3 is communicated with the filter 4 through a circulating pump 10;
an outlet of the filter 4 is communicated with a water inlet of the tubular ultrafiltration membrane component 5, a concentrated water outlet of the tubular ultrafiltration membrane component 5 returns to the concentration tank 3 through a concentrated water return pipe, and a water production port of the tubular ultrafiltration membrane component 5 is communicated with the water production tank 6 through a water production pipe;
the bottom concentrated water outlet of the first reaction tank 1, the bottom concentrated water outlet of the second reaction tank 2 and the bottom concentrated water outlet of the concentration tank 3 are converged to a precipitation slurry tank 7 through connecting pipes, and the precipitation slurry tank 7 is communicated to a plate-and-frame filter press 8.
The first reaction tank 1, the second reaction tank 2, the concentration tank 3, the water production tank 6, the precipitation slurry tank 7 and the plate-and-frame filter press 8 are not limited and are common devices in the chemical field.
The filter 4 is used for pretreating the supernatant overflowing from the supernatant outlet at the upper part of the concentration tank 3, and the filter 4 comprises an upper layer of filter screen, a lower layer of filter screen and a porous activated carbon microsphere layer arranged between the filter screens, so that a part of sludge can be filtered out, some organic matters can be adsorbed, and the treatment load of the next tubular ultrafiltration membrane component 5 is reduced.
The ultrafiltration membrane in the tubular ultrafiltration membrane component 5 is a polyvinylidene fluoride (PVDF) ultrafiltration membrane, and can isolate substances such as colloidal substances, fine suspended matters, microorganisms, bacteria and macromolecules in water. With the development of membrane preparation technology, ultrafiltration membranes with various pore diameters can be accurately prepared, and specifically, the average diameter of more than 95% of pores of the ultrafiltration membrane is 0.03 μm, so as to achieve oil-water separation. The tubular ultrafiltration membrane component 5 can be connected with 2 groups, 3 groups or more groups in parallel according to the treatment capacity, and 4-6 branch type ultrafiltration membranes can be connected in series in each group.
As shown in fig. 1, a valve 13 is disposed on a connection pipeline between a first reaction tank 1 and a second reaction tank 2, when the wastewater chemical adding reaction and sedimentation are completed in the first reaction tank 1, the valve 13 is opened, and the supernatant of the first reaction tank 1 enters the second reaction tank 2 through the supernatant outlet at the upper part thereof; a valve 14 is arranged on a connecting pipeline between the second reaction tank 2 and the concentration tank 3, when the wastewater in the second reaction tank 2 is subjected to dosing reaction and sedimentation, the valve 14 is opened, and the supernatant of the second reaction tank 2 enters the concentration tank 3 through a supernatant outlet at the upper part of the second reaction tank; a valve 15 is arranged on a connecting pipeline between the concentration tank 3 and the filter 4, the valve 15 can be arranged in front of the circulating pump 10 or behind the circulating pump 10, the valve 15 is used for controlling the filtration process to be started, and the circulating pump 10 is used for increasing the water flow pressure; valves 16, 17 and 20 are respectively arranged on a connecting pipeline of the filter 4 and the tubular ultrafiltration membrane component 5, a water production pipeline and a concentrated water return pipeline and are used for controlling an ultrafiltration process; valves 25, 26 and 27 are respectively arranged on connecting pipelines of the bottom concentrated water outlet of the first reaction tank 1, the bottom concentrated water outlet of the second reaction tank 2 and the bottom concentrated water outlet of the concentration tank 3 and the sedimentation mud tank 7 for controlling the discharge of the bottom concentrated water.
Fig. 2 schematically shows the structure of a pharmaceutical chemical wastewater comprehensive pretreatment system according to another embodiment of the present invention. As shown in fig. 2, the comprehensive pretreatment system for pharmaceutical and chemical wastewater further comprises an ultrafiltration membrane backwashing unit, wherein the ultrafiltration membrane backwashing unit comprises a backwashing pump 12, the backwashing pump 12 is connected with a backwashing port of the tubular ultrafiltration membrane component 5, and is connected with the water production tank 6 through a connecting pipe and a valve 19. When backwashing is needed, water produced in the water production pool 6 enters the tubular ultrafiltration membrane component 5 through the backwashing pump 12, and backwashing is carried out by utilizing the backwashing water pressure which is greater than the pressure in the membrane component, so that membrane pollution is delayed.
As shown in fig. 2, the comprehensive pretreatment system for pharmaceutical and chemical wastewater further comprises an ultrafiltration membrane cleaning unit, wherein the ultrafiltration membrane cleaning unit comprises a cleaning water tank 9, the cleaning water tank 9 is communicated with a circulating pump 10 through a connecting pipe via a cleaning pump 11 and a valve 21, is communicated with a concentrated water outlet of the tubular ultrafiltration membrane component 5 via a valve 24 via the connecting pipe, and is communicated with a water production port of the tubular ultrafiltration membrane component 5 via a valve 23 via the connecting pipe. When chemical cleaning is needed, the chemicals in the cleaning water tank 9 enter the filter 4 and the tubular ultrafiltration membrane module 5 through the circulating pump 11, the valve 21 and the circulating pump 10, cross-flow circulation is performed in the tubular ultrafiltration membrane module 5 to clean the ultrafiltration membrane of the tubular ultrafiltration membrane module 5, and effluent flows back to the cleaning water tank 9 through the water production port and the concentrated water outlet through the pipelines.
The comprehensive pretreatment system for pharmaceutical and chemical wastewater disclosed by the utility model is used for pretreating pharmaceutical and chemical wastewater as follows: the pharmaceutical chemical wastewater enters the first reaction tank 1, after the drug adding reaction and the sedimentation, the valve 13 is opened, and the supernatant of the first reaction tank 1 overflows into the second reaction tank 2 through the supernatant outlet at the upper part of the first reaction tank; in the second reaction tank 2, after the dosing reaction and the sedimentation, the valve 14 is opened, and the supernatant of the second reaction tank 2 overflows into the concentration tank 3 through the supernatant outlet at the upper part of the second reaction tank; after the concentration tank 3 is further settled, the supernatant is filtered by a filter 4, the filtrate enters a tubular ultrafiltration membrane component 5 for ultrafiltration treatment, concentrated water flows back to the concentration tank 3 through a concentrated water return pipe, clean water permeates through a membrane pipe and enters a water production tank 6 from a water production port through a water production pipe, and the produced water reaches the special water pollutant discharge standard in the domestic garbage landfill pollution control standard (GB16889-2008) and is directly discharged, or is further treated subsequently, such as high-pressure reverse osmosis membrane treatment, so that the purpose of recycling is achieved.
When the sludge concentration of the concentrated water in the concentration tank 3 is detected to reach 15g/L, valves 25, 26 and 27 are opened, the sludge is discharged to the sedimentation sludge tank 7, then the sludge is subjected to filter pressing through a plate-and-frame filter press 8, the sludge cake can be entrusted to professional units for treatment, and the filtrate enters the first reaction tank 1 for retreatment.
When backwashing is needed, water produced in the water production pool 6 enters the tubular ultrafiltration membrane component 5 through the backwashing pump 12, and backwashing is carried out by utilizing the backwashing water pressure which is greater than the pressure in the membrane component, so that membrane pollution is delayed.
When chemical cleaning is needed, the chemicals in the cleaning water tank 9 enter the filter 4 and the tubular ultrafiltration membrane module 5 through the circulating pump 11, the valve 21 and the circulating pump 10, cross-flow circulation is performed in the tubular ultrafiltration membrane module 5 to clean the ultrafiltration membrane of the tubular ultrafiltration membrane module 5, and effluent flows back to the cleaning water tank 9 through the water production port and the concentrated water outlet through the pipelines.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, which is defined by the claims.
Claims (8)
1. The utility model provides a preliminary treatment system is synthesized to pharmaceutical chemical industry waste water, characterized by, includes first reaction tank, second reaction tank, concentration tank, filter, tubular ultrafiltration membrane subassembly and produces the pond, wherein:
the first reaction tank comprises a raw water inlet, an upper supernatant outlet and a bottom concentrated water outlet;
the second reaction tank comprises an inlet, an upper supernatant outlet and a bottom concentrated water outlet, and the inlet of the second reaction tank is communicated with the upper supernatant outlet of the first reaction tank;
the concentration tank comprises an inlet, an upper supernatant outlet and a bottom concentrated water outlet, the inlet of the concentration tank is communicated with the upper supernatant outlet of the second reaction tank, and the upper supernatant outlet of the concentration tank is communicated with the filter through a circulating pump;
the outlet of the filter is communicated with the water inlet of the tubular ultrafiltration membrane component, the concentrated water outlet of the tubular ultrafiltration membrane component returns to the concentration tank through a concentrated water return pipe, and the water production port of the tubular ultrafiltration membrane component is communicated with the water production tank through a water production pipe;
and the bottom concentrated water outlet of the first reaction tank, the bottom concentrated water outlet of the second reaction tank and the bottom concentrated water outlet of the concentration tank are converged to a precipitation mud tank through connecting pipes, and the precipitation mud tank is communicated to a plate-and-frame filter press.
2. The comprehensive pretreatment system for pharmaceutical and chemical wastewater as claimed in claim 1, wherein the filter comprises an upper layer of filter screen and a lower layer of filter screen, and a porous activated carbon microsphere layer arranged between the filter screens.
3. The comprehensive pretreatment system for pharmaceutical and chemical wastewater as claimed in claim 1, wherein the ultrafiltration membrane in the tubular ultrafiltration membrane module is a polyvinylidene fluoride ultrafiltration membrane.
4. The comprehensive pretreatment system for pharmaceutical and chemical wastewater according to claim 3, wherein 95% or more of the pores of the ultrafiltration membrane have an average diameter of 0.03 μm.
5. The comprehensive pretreatment system for pharmaceutical and chemical wastewater as claimed in claim 3, wherein the tubular ultrafiltration membrane modules are connected in parallel in 2, 3 or more groups, and each group is connected with 4-6 branch type ultrafiltration membranes in series.
6. The integrated pretreatment system for pharmaceutical and chemical wastewater of claim 1, further comprising valves disposed on the following pipelines: the device comprises a connecting pipeline of a first reaction tank and a second reaction tank, a connecting pipeline of the second reaction tank and a concentration tank, a connecting pipeline of the concentration tank and a filter, a connecting pipeline of the filter and a tubular ultrafiltration membrane component, a water production pipeline, a concentrated water return pipeline, and a connecting pipeline between a bottom concentrated water outlet of the first reaction tank, a bottom concentrated water outlet of the second reaction tank and a bottom concentrated water outlet of the concentration tank and a precipitated mud tank respectively.
7. The comprehensive pretreatment system for pharmaceutical and chemical wastewater as claimed in claim 1, wherein the comprehensive pretreatment system further comprises an ultrafiltration membrane backwashing unit, the ultrafiltration membrane backwashing unit comprises a backwashing pump, and the backwashing pump is connected with a backwashing port of the tubular ultrafiltration membrane component and is connected with the water production tank through a valve by a connecting pipe.
8. The comprehensive pretreatment system for pharmaceutical and chemical wastewater as claimed in claim 1, further comprising an ultrafiltration membrane cleaning unit, wherein the ultrafiltration membrane cleaning unit comprises a cleaning water tank, the cleaning water tank is communicated with the circulating pump through a cleaning pump and a valve through a connecting pipe, is communicated with the concentrated water outlet of the tubular ultrafiltration membrane module through the valve through the connecting pipe, and is communicated with the water production port of the tubular ultrafiltration membrane module through the valve through the connecting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121573085.4U CN215439974U (en) | 2021-07-12 | 2021-07-12 | Pharmaceutical chemical wastewater comprehensive pretreatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121573085.4U CN215439974U (en) | 2021-07-12 | 2021-07-12 | Pharmaceutical chemical wastewater comprehensive pretreatment system |
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| Publication Number | Publication Date |
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| CN215439974U true CN215439974U (en) | 2022-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121573085.4U Expired - Fee Related CN215439974U (en) | 2021-07-12 | 2021-07-12 | Pharmaceutical chemical wastewater comprehensive pretreatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117417006A (en) * | 2023-11-23 | 2024-01-19 | 青岛百发海水淡化有限公司 | Seawater desalination pretreatment process system in low-temperature state and operation method |
-
2021
- 2021-07-12 CN CN202121573085.4U patent/CN215439974U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117417006A (en) * | 2023-11-23 | 2024-01-19 | 青岛百发海水淡化有限公司 | Seawater desalination pretreatment process system in low-temperature state and operation method |
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Granted publication date: 20220107 |