CN111484092A - Contact heat exchange type sewage concentration system and process - Google Patents
Contact heat exchange type sewage concentration system and process Download PDFInfo
- Publication number
- CN111484092A CN111484092A CN202010310554.7A CN202010310554A CN111484092A CN 111484092 A CN111484092 A CN 111484092A CN 202010310554 A CN202010310554 A CN 202010310554A CN 111484092 A CN111484092 A CN 111484092A
- Authority
- CN
- China
- Prior art keywords
- tower
- sewage
- humidifying
- heat exchange
- concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
Abstract
The invention particularly relates to a contact heat exchange type sewage concentration system and a process. The salt-containing sewage is concentrated, so that the sewage treatment capacity can be effectively improved, and the loss degree of a treatment element is reduced. The invention provides a contact heat exchange type sewage concentration system, aiming at the technical defects that a multi-stage heat exchange or steam leading-out device is generally needed and the prior investment is increased in the humidification and dehumidification technology in the prior art, wherein the sewage concentration system comprises a heating device, a humidification tower, a condensation tower, a fan, a preheater and a cooling tower, the system fully utilizes the heat exchange in the humidification and dehumidification process in the sewage concentration system, the multi-stage heat exchange device is not needed, no harmful components are produced in the concentration system, and the system can also be applied to the concentration treatment of other solutions and has good application prospect.
Description
Technical Field
The invention belongs to the technical field of salt-containing sewage concentration, and particularly relates to a contact heat exchange type salt-containing sewage concentration system and process.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The salt-containing sewage is mainly from the production processes of petrochemical enterprises, pharmaceutical enterprises and other enterprises and the tail gas treatment processes of electric power, steel and other industries, and the treatment methods are roughly divided into two types of physicochemical methods and biological treatment methods, wherein the physicochemical methods mainly comprise a reverse osmosis method desalting method, an electrodialysis desalting method, an ion exchange desalting method, a nanofiltration method desalting method, an evaporative crystallization method desalting method and the like. The electrodialysis desalination method is to use an anion-cation exchange membrane to treat the saline sewage under the action of an external electric field, but the method can cause the breakdown of electrodes; the ion exchange desalting method is to contact ion exchange resin with sewage and remove salt in the saline sewage by the ion exchange method, but the resin pollution is easily caused, and the effect is influenced; the nanofiltration desalination method also adopts a membrane separation technology, but has strong selectivity; the evaporative crystallization desalination method is to evaporate water in the saline sewage by adopting a heat source through evaporation, and can highly concentrate the saline sewage by adopting methods such as single effect, double effect and triple effect, but the bottleneck encountered by the prior art is the heat source used. The biological treatment method is mainly used for treating the salt-containing sewage by salt-tolerant and halophilic microorganisms. The reverse osmosis desalination method adopts a membrane separation technology, and a process for treating salt-containing sewage by means of osmotic pressure difference is widely applied to the industrial field by virtue of the advantages of low cost, high benefit, strong adaptability and the like. The membrane concentration system adopted in the prior art has the upper limit of the salt content of concentrated water and the limited concentration ratio, and the concentration of the salt-containing sewage in advance is favorable for reducing the sewage treatment capacity and the loss degree of membrane elements. The prior art also has a proposal of evaporating and concentrating the salt-containing wastewater by taking air as a carrier, and the flowing air is taken as the carrier of water vapor to carry the water in the salt-containing water to enter a condensing device for removing by a humidifying and dehumidifying method; however, the inventor believes that the scheme usually needs a multi-stage steam outlet or heat exchange structure, and the cost of early investment and later maintenance is high.
Disclosure of Invention
In view of the above research background, the invention provides a contact heat exchange type sewage concentration system, which uses a humidification tower to realize humidification and concentration of low-concentration saline sewage, and uses condensation to recover heat required by humidification and supply the heat to the humidification tower again for dehumidification. The concentration system has reasonable device and equipment, does not need multistage heat exchange and a guiding device, and is suitable for concentration of solution in various chemical industries.
Based on the technical effects, the invention provides the following technical scheme:
in a first aspect of the present invention, a contact heat exchange type sewage concentration system is provided, which includes a heating device, a humidifying tower, a condensing tower, a fan, a preheater and a cooling tower;
the heating device is arranged on a water inlet pipeline of the humidifying tower and is used for heating low-concentration sewage entering the humidifying tower; the water inlet of the humidifying tower is arranged above the humidifying tower, the top of the humidifying tower is provided with a pipeline which is communicated with the lower part of the condensing tower, and the lower part of the humidifying tower is communicated with a fan so that air enters the humidifying tower; the top of the condensing tower is communicated with the outside, and an internal condensing water pipeline and the cooling tower form a loop; the preheater is arranged on a pipeline of the condensing tower flowing to the cooling tower and is connected with the fan, and the heat of the hot water flowing out of the condensing tower is supplied to the fan to heat the air entering the humidifying tower.
In the sewage concentration system provided by the invention, only the heat exchanger is needed to carry out primary heat exchange on the low-concentration salt-containing sewage for energy input, and the gas emission generated in the production process meets the national standard: the discharge amount of benzene, toluene and formaldehyde in VOC is respectively less than or equal to 17mg/m3、60mg/m3、30mg/m3The limit of the particulate matter PM2.5 is 35/75 μ g/m3(first-order/second-order daily average), and the liquid drop is less than or equal to 75mg/Nm3And the like.
According to a second aspect of the invention, a saline sewage concentration process is performed based on the contact heat exchange type sewage concentration system of the first aspect, low-concentration saline sewage enters a humidifying tower after being heated by the heating device, steam is formed by spraying through a nozzle inside the humidifying tower, a fan is started to introduce hot air into the humidifying tower, and then high-concentration saline sewage is collected from the bottom of the humidifying tower.
In a third aspect of the invention, there is provided a use of the contact heat exchange type wastewater concentration system of the first aspect for liquid concentration.
The beneficial effects of one or more technical schemes are as follows:
the sewage concentration system optimizes and improves a sewage treatment system in the prior art, reduces equipment required to be introduced into the concentration system, and obviously reduces the early investment and the later maintenance cost.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view showing a configuration of a contact heat exchange type sewage concentration system according to embodiment 1;
wherein, 1, a heat exchanger; 2. a humidifying tower; 3. a condensing tower; 4. a cooling tower; 5. a preheater; 6. a fan; 7. a condensed water pipe; 8. circulating water pipe.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced by the background technology, aiming at the defects in the prior art, the invention provides a contact heat exchange type saline sewage concentration system and a process thereof in order to solve the technical problems.
In a first aspect of the present invention, a contact heat exchange type sewage concentration system is provided, which includes a heat exchanger 1, a humidifying tower 2, a condensing tower 3, a fan 6, a preheater 5 and a cooling tower 4.
The heating device is arranged on a water inlet pipeline of the humidifying tower and is used for heating low-concentration sewage entering the humidifying tower; the water inlet of the humidifying tower is arranged above the humidifying tower, the top of the humidifying tower is provided with a pipeline which is communicated with the lower part of the condensing tower, and the lower part of the humidifying tower is communicated with a fan so that air enters the humidifying tower; the top of the condensing tower is communicated with the outside, and an internal condensing water pipeline and the cooling tower form a loop; the preheater is arranged on a pipeline of the condensing tower flowing to the cooling tower and is connected with the fan, and the heat of the hot water flowing out of the condensing tower is supplied to the fan to heat the air entering the humidifying tower.
Preferably, the heating device is a heat exchanger.
Further preferably, the temperature of the heat exchanger is 85 ℃ or more.
More preferably, the heat exchanger is made of a material selected from a metal material such as stainless steel, common brass, and industrial pure copper, and a non-metal material such as ceramic, glass, polytetrafluoroethylene, and graphite.
Preferably, the temperature of the low-concentration sewage entering the humidifying tower is more than or equal to 80 ℃.
Preferably, the humidifying tower is a contact heat exchange humidifying tower.
Further preferably, the contact heat exchange humidifying tower is internally provided with a nozzle, in particular a pressurizing nozzle.
Further preferably, the humidifying tower is internally provided with an inner lining, and the inner lining is made of glass fiber reinforced plastics, carbon steel, stainless steel or titanium materials.
Preferably, the humidifying tower water inlet line is further provided with a pump for pumping the low-concentration sewage into the humidifying tower.
Preferably, the bottom of the humidifying tower is provided with a water outlet pipeline or a collecting device for transporting the concentrated sewage to a subsequent treatment system or collecting the concentrated sewage.
Preferably, the temperature of the air entering the humidifying tower is more than or equal to 38 ℃.
Preferably, the top of the condensing tower is provided with a demister and a fan, a small amount of wet air entering the condensing tower is changed into air through the demister, and the air is pumped out of the condensing tower through the fan.
Preferably, a loop formed by the internal pipeline of the condensed water and the cooling tower is provided with a pump; further preferably, the pump is provided on a circuit of the cooling tower flowing into the condensing tower.
Preferably, a water receiving tray is arranged below the pipeline inside the condensation tower and used for containing water formed by condensation.
Preferably, the cooling tower is a mixed ventilation type cooling tower, and the filler is PVC.
Further preferably, the inlet and outlet of the cooling tower are provided with thermistors, and the cooling effect on the condensed water in the loop is realized through an automatic control system.
According to a second aspect of the invention, a saline sewage concentration process is performed based on the contact heat exchange type sewage concentration system of the first aspect, low-concentration saline sewage enters a humidifying tower after being heated by the heating device, steam is formed by spraying through a nozzle inside the humidifying tower, a fan is started to introduce hot air into the humidifying tower, and then high-concentration saline sewage is collected from the bottom of the humidifying tower.
Preferably, the temperature of the heating device is more than or equal to 85 ℃.
Preferably, the temperature of the low-concentration sewage entering the humidifying tower is more than or equal to 80 ℃.
Preferably, the temperature of the hot air entering the humidifying tower is more than or equal to 38 ℃.
Preferably, the concentration process further comprises passing part or all of the concentrated saline water into untreated low-concentration saline water.
In a third aspect of the invention, there is provided a use of the contact heat exchange type wastewater concentration system of the first aspect for liquid concentration.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
In the embodiment, a contact heat exchange type saline sewage concentration system is provided, and the concentration system has a structure shown in fig. 1, and comprises a heat exchanger 1, a humidifying tower 2, a condensing tower 3, a cooling tower 4, a preheater 5 and a fan 6.
The heat exchanger 1 is arranged on a water inlet pipeline of the humidifying tower 2 and used for heating low-concentration sewage entering the humidifying tower. The heat exchanger 1 is a high-temperature hot water heat exchanger made of ceramic materials, and the temperature is set to be 95 ℃. The temperature of the low concentration wastewater passing through the heat exchanger 1 into the humidifying tower may reach 85 ℃.
The top of the humidifying tower 2 is provided with a pipeline which is communicated with the lower part of the condensing tower 3, and the lower part of the humidifying tower 2 is communicated with a fan so that air enters the humidifying tower 2. The humidifying tower 2 is a contact heat exchange type humidifying tower, a water inlet of a water inlet pipeline is arranged above the humidifying tower 2, and high-temperature wastewater enters the humidifying tower 2 and then is sprayed by a nozzle in the tower to form steam. Inside below fan introduced humidifying tower 2 with the air, air and vapor reverse flow, partial vapor in the steam can be taken away to the air to realize the concentration that contains salt sewage, the high concentration sewage after the concentration falls in humidifying tower 2 bottom, draws forth through the pipeline.
The condensing tower 3 is internally provided with a coil pipe type condensed water pipeline, and the condensed water is cooled through the cooling tower 4. The hot air carries water vapor to enter the condensing tower 3 from a pipeline at the top of the humidifying tower 2, and the water is condensed into water after contacting with a low-temperature condensing pipe coil and falls into a water receiving tray below the condensing tower. The top of the condensing tower 3 is provided with a demister, a small amount of steam overflows from the top of the condensing tower, is processed into air through the demister, and is pumped out of the condensing tower by a fan at the top.
The coil pipe inside the condensing tower 3 and the cooling tower form a loop, and the loop comprises a condensed water pipe 7 and a circulating water pipe 8 which are shown in the attached figure 1. The preheater 5 is arranged on the condensed water pipe 7 and connected with the fan 6, and the preheater 5 supplies the heat of the hot water flowing out of the condensing tower to the fan to heat the air entering the humidifying tower, so that the temperature of the air entering the humidifying tower reaches 39 ℃.
Example 2
In this embodiment, a replacement scheme of the contact heat exchange type salt-containing sewage concentration system in embodiment 1 is provided: the humidifying tower is internally provided with a lining, and the lining is made of glass fiber reinforced plastic, carbon steel, stainless steel or titanium materials and is used for reducing the corrosion effect of salt in sewage on the inner wall and prolonging the service life of elements.
Example 3
In this embodiment, a replacement scheme of the contact heat exchange type salt-containing sewage concentration system in embodiment 1 is provided: the inlet and the outlet of the cooling tower are provided with thermistors, and the opening of refrigeration equipment is controlled by automatically sensing the temperature of condensed water in a pipeline, so that the production energy is further saved.
Example 4
In this embodiment, a process for concentrating salt-containing sewage by using the contact heat exchange type salt-containing sewage concentration system in embodiment 1 is provided, which includes the following steps:
the low-concentration salt-containing sewage is conveyed to the humidifying tower through the pump, is heated by the heat exchanger until the temperature reaches 85 ℃, enters the humidifying tower, is atomized into steam through a nozzle inside the humidifying tower, hot air is introduced into the humidifying tower by starting the fan, and the air and the steam reversely flow to carry the steam to the condensing tower. After a period of time, high concentration salt-containing wastewater is recovered from the bottom of the humidifying tower.
Example 5
In this embodiment, an alternative method of embodiment 4 is provided, in which the high-concentration salt-containing wastewater at the bottom of the humidifying tower is introduced into the untreated low-concentration salt-containing wastewater through a pipeline part, so that the concentration degree is further improved, and part of heat can be transferred to the low-concentration salt-containing wastewater to preheat.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A contact heat exchange type sewage concentration system is characterized by comprising a heating device, a humidifying tower, a condensing tower, a fan, a preheater and a cooling tower;
the heating device is arranged on a water inlet pipeline of the humidifying tower and is used for heating low-concentration sewage entering the humidifying tower; the water inlet of the humidifying tower is arranged above the humidifying tower, the top of the humidifying tower is provided with a pipeline which is communicated with the lower part of the condensing tower, and the lower part of the humidifying tower is communicated with a fan so that air enters the humidifying tower; the top of the condensing tower is communicated with the outside, and an internal condensing water pipeline and the cooling tower form a loop; the preheater is arranged on a pipeline of the condensing tower flowing to the cooling tower and is connected with the fan, and the heat of the hot water flowing out of the condensing tower is supplied to the fan to heat the air entering the humidifying tower.
2. The contact heat exchange wastewater concentration system of claim 1, wherein the heating device is a heat exchanger;
preferably, the temperature of the heat exchanger is more than or equal to 85 ℃;
preferably, the heat exchanger is made of a material selected from a metal material such as stainless steel, common brass, and industrial pure copper, and a non-metal material such as ceramic, glass, polytetrafluoroethylene, and graphite.
3. The contact heat exchange type sewage concentrating system of claim 1, wherein the temperature of the low concentration sewage entering the humidifying tower is 80 ℃ or more.
4. The contact heat exchange wastewater concentration system of claim 1, wherein the moisturizer tower is a contact heat exchange moisturizer tower;
preferably, the contact heat exchange humidifying tower is internally provided with a nozzle, and further preferably a pressurizing nozzle;
preferably, the humidifying tower is internally provided with an inner lining, and the inner lining is made of glass fiber reinforced plastics, carbon steel, stainless steel or titanium materials.
5. The contact heat exchange wastewater concentration system of claim 1, wherein the humidifying tower inlet line further comprises a pump for pumping the low concentration wastewater into the humidifying tower;
or the bottom of the humidifying tower is provided with a water outlet pipeline or a collecting device which is used for transporting the concentrated sewage to a subsequent treatment system or collecting the concentrated sewage;
or the temperature of the air entering the humidifying tower is more than or equal to 38 ℃.
6. The contact heat exchange type sewage concentrating system of claim 1, wherein the condensing tower is provided with a demister at the top and a fan, a small amount of wet air entering the condensing tower is changed into air through the demister, and the air is pumped out of the condensing tower through the fan;
or a loop formed by the internal pipeline of the condensed water and the cooling tower is provided with a pump; preferably, the pump is arranged on a loop of the cooling tower flowing into the condensing tower.
7. The contact heat exchange type sewage concentrating system as claimed in claim 1, wherein a water receiving tray is provided below the internal pipeline of the condensing tower for receiving water formed by condensation;
or the cooling tower adopts a mixed ventilation type cooling tower, and the filler is PVC;
or the inlet and the outlet of the cooling tower are provided with thermistors, and the cooling effect of the condensed water in the loop is realized through an automatic control system.
8. The saline sewage concentration process is carried out based on the contact heat exchange type sewage concentration system of any one of claims 1 to 7, low-concentration saline sewage enters a humidifying tower after being heated by the heating device, steam is formed by spraying through nozzles inside the humidifying tower, a fan is started to introduce hot air into the humidifying tower, and then high-concentration saline sewage is collected from the bottom of the humidifying tower.
9. The concentration process of salt-containing sewage of claim 8, wherein the temperature of the heating device is 85 ℃ or more;
or the temperature of the low-concentration sewage entering the humidifying tower is more than or equal to 80 ℃;
or the temperature of the hot air entering the humidifying tower is more than or equal to 38 ℃.
10. Use of the contact heat exchange wastewater concentration system of any of claims 1-7 for concentrating a liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010310554.7A CN111484092A (en) | 2020-04-20 | 2020-04-20 | Contact heat exchange type sewage concentration system and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010310554.7A CN111484092A (en) | 2020-04-20 | 2020-04-20 | Contact heat exchange type sewage concentration system and process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111484092A true CN111484092A (en) | 2020-08-04 |
Family
ID=71798018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010310554.7A Pending CN111484092A (en) | 2020-04-20 | 2020-04-20 | Contact heat exchange type sewage concentration system and process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111484092A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666444A (en) * | 2021-08-09 | 2021-11-19 | 南京飞普特科技有限公司 | Binary system evaporative crystallization device and evaporative crystallization method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101734823A (en) * | 2009-12-25 | 2010-06-16 | 南京大学 | Seawater desalination process with low cost |
| CN208856938U (en) * | 2018-08-07 | 2019-05-14 | 无锡利信能源科技有限公司 | A kind of desulfurization wastewater concentration structure |
-
2020
- 2020-04-20 CN CN202010310554.7A patent/CN111484092A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101734823A (en) * | 2009-12-25 | 2010-06-16 | 南京大学 | Seawater desalination process with low cost |
| CN208856938U (en) * | 2018-08-07 | 2019-05-14 | 无锡利信能源科技有限公司 | A kind of desulfurization wastewater concentration structure |
Non-Patent Citations (1)
| Title |
|---|
| 白坤等编: "《玉米淀粉工程技术》", 31 January 2012, 中国轻工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666444A (en) * | 2021-08-09 | 2021-11-19 | 南京飞普特科技有限公司 | Binary system evaporative crystallization device and evaporative crystallization method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20110180479A1 (en) | Zero liquid discharge water treatment system and method | |
| US20200001197A1 (en) | Stacked type falling film evaporator, zero liquid discharge system comprising the same, and zero liquid discharging method using the same | |
| CN205527824U (en) | Recovery equipment for wastewater treatment | |
| US20150232348A1 (en) | Water desalination and brine volume reduction process | |
| KR101188726B1 (en) | System and method for eliminating ammonia nitrogen from wastewater | |
| CN103073146A (en) | Waste water treatment method and device based on forward osmosis and membrane distillation | |
| WO2003013682A1 (en) | Apparatus and method for thermal desalination based on pressurized formation and evaporation of droplets | |
| US11192802B2 (en) | Desalinization device and method of using the same | |
| US11014833B2 (en) | Energy saving desalination system | |
| CN111278539B (en) | Membrane evaporation enhanced steam condenser | |
| CN104085933A (en) | High-salinity and high organic matter wastewater treatment process | |
| US11801451B2 (en) | Method and apparatus for desalinating water | |
| CN107324426A (en) | A kind of residual heat from boiler fume coupling evaporation concentrates desulfurization wastewater system | |
| CN101318716A (en) | Film evaporating concentration liquid processing system and processing method | |
| KR20170044734A (en) | Method and arrangement for operating a steam turbine plant in combination with thermal water treatment | |
| CN111484092A (en) | Contact heat exchange type sewage concentration system and process | |
| CN212050614U (en) | Contain concentrated system of salt sewage | |
| JPH11503959A (en) | Method and apparatus for purifying steam | |
| US20230035924A1 (en) | System and method for water treatment | |
| CN210764425U (en) | Solar high-temperature high-pressure expansion flash system for salt-containing wastewater | |
| CN107434325A (en) | Electroplating wastewater treatment technique caused by a kind of pcb board manufacture | |
| CN204939142U (en) | A kind for the treatment of facility of desulfurization wastewater of flue gas desulphurization system discharge | |
| KR100505794B1 (en) | Device for cleaning a fluid in the form of a vapor from a circuit | |
| JPH11244843A (en) | Steam compression type pure water producing device | |
| CN108529806A (en) | A kind of reverse osmosis concentrated water zero discharge low energy consumption device of coking wastewater and processing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |