CN113087203A - PTFE wastewater treatment process and sewage treatment equipment - Google Patents
PTFE wastewater treatment process and sewage treatment equipment Download PDFInfo
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- CN113087203A CN113087203A CN202110320890.4A CN202110320890A CN113087203A CN 113087203 A CN113087203 A CN 113087203A CN 202110320890 A CN202110320890 A CN 202110320890A CN 113087203 A CN113087203 A CN 113087203A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/36—Organic compounds containing halogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Chemical & Material Sciences (AREA)
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Abstract
The invention provides a PTFE wastewater treatment process and sewage treatment equipment. The treatment process comprises the following steps: conveying the PTFE wastewater to an air floatation device; adding a flocculating agent into the air flotation device, releasing a large number of micro-bubble groups at the bottom of the air flotation tank, and scraping suspended matters floating on the water surface into a slag tank by using a slag scraper for subsequent treatment; inputting the air-flotation effluent into an intermediate water tank, and pumping the air-flotation effluent of the intermediate water tank into a pre-filtering device for filtering; directly supplying the outlet water of the pre-filtering device to a vibrating membrane filtering device, and supplying the concentrated water intercepted by the vibrating membrane filtering device to the raw water tank and the water inlet end of the vibrating membrane; and the produced water filtered and flowed out by the vibrating membrane filtering device is supplied to a reverse osmosis water inlet tank and enters a reverse osmosis membrane device through a water feeding pump, a cartridge filter and a reverse osmosis high-pressure pump. The sewage treatment equipment comprises a raw water tank, an air floatation device, a middle water tank, a pre-filtering device, a vibrating membrane device and a reverse osmosis membrane device.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a PTFE (polytetrafluoroethylene) wastewater treatment process and sewage treatment equipment.
Background
The industrial wastewater comprises production wastewater and production sewage, and refers to wastewater and waste liquid generated in the industrial production process, wherein the wastewater and the waste liquid contain industrial production materials, intermediate products, byproducts and pollutants generated in the production process, which are lost along with water. The industrial wastewater has various types and complex components; wherein the treatment of viscous wastewater has been a difficult problem for wastewater treatment. The viscous wastewater mainly comes from the fields of printing and dyeing industry, leather industry, paper industry, coking industry, plastic industry and the like, and the conventional physical and chemical treatment process is influenced by the viscosity of the wastewater, so that the viscous wastewater needs to be treated by adopting a special treatment process.
PTFE (polytetrafluoroethylene) waste water in viscous waste water is also a viscous waste water, and is mainly caused by viscous PTFE powder in the waste water. PTFE powder is extremely fine, the particle size is dozens of nanometers to hundreds of nanometers, and the PTFE powder is difficult to completely remove by the pretreatment processes such as coagulating sedimentation, air flotation, filtration and the like. The conventional double-membrane process (microfiltration/ultrafiltration + reverse osmosis) for treating PTFE wastewater has serious membrane pollution, frequent chemical cleaning is needed, powdered activated carbon is not added, and a wastewater treatment system can not normally operate. The large cross flow tubular membrane and reverse osmosis membrane process with strong pollution resistance is adopted, powdered activated carbon needs to be continuously added, the powdered activated carbon adsorbing pollutants can be defined as dangerous waste, the operation cost is increased, the large cross flow is needed to improve the liquid flow rate on the surface of the membrane in the operation of the tubular membrane, the pollutants attached to the surface of the membrane are washed away, the power consumption is high, and the investment is high.
FIG. 1 is a flow chart of a process used in the prior art for the advanced treatment of viscous wastewater. As shown in figure 1, the prior art adopts a process of a large cross flow tubular membrane and a reverse osmosis membrane to treat viscous wastewater; the tubular membrane in the process needs to adopt large cross flow to improve the flow velocity of liquid on the surface of the membrane so as to wash away pollutants attached to the surface of the membrane, and the power consumption is high. Besides the above treatment modes, the prior art can also adopt microfiltration/ultrafiltration and reverse osmosis processes to treat viscous wastewater; this treatment can result in significant fouling of the separation membrane, requiring frequent chemical cleaning. When the two conventional double-membrane process are adopted to treat viscous wastewater, in order to ensure the normal operation of the system, powdered activated carbon is required to be continuously added, the powdered activated carbon adsorbing pollutants also belongs to a dangerous waste product in a strict sense, and the operation cost is greatly increased.
Disclosure of Invention
In view of the above, the present invention provides a PTFE wastewater treatment process and wastewater treatment equipment for solving the above problems in the prior art.
In the treatment process for PTFE wastewater according to the present disclosure, the treatment process includes: conveying the PTFE wastewater in the raw water tank to an air floatation device; adding a flocculating agent into a reaction tank of the air floatation device, so that the PTFE wastewater is fully mixed with the flocculating agent in the reaction tank of the air floatation device for flocculation reaction to form suspended particles; then, feeding the PEFE wastewater after the flocculation reaction into an air flotation tank through a middle water inlet hole of an air flotation device, releasing a large number of micro-bubble groups at the bottom of the air flotation tank of the air flotation device, and scraping suspended matters which slowly rise under the carrying of the micro-bubbles and finally float on the water surface into a slag tank by using a slag scraper for subsequent treatment; inputting the air-floated effluent into an intermediate water tank, and conveying the air-floated effluent of the intermediate water tank into a pre-filtering device for filtering; directly supplying the outlet water of the pre-filtering device to a vibrating membrane filtering device, and supplying the concentrated water intercepted by the vibrating membrane filtering device to the raw water tank and the water inlet end of the vibrating membrane; and the effluent filtered and flowed out by the vibrating membrane filtering device is supplied to a reverse osmosis water inlet tank and enters a reverse osmosis membrane device through a water feeding pump, a cartridge filter and a reverse osmosis high-pressure pump. For example, the air flotation water in the intermediate water tank can be sent to a pre-filtering device for filtering by using an air flotation water pump.
In one embodiment of the treatment process according to the present disclosure, the vibrating membrane filtration device employs cross-flow filtration. The vibrating membrane is an ultrafiltration membrane used for filtering viscous PTFE fine powder, the aperture of the ultrafiltration membrane is between 10nm and 100nm, and the cut-off molecular weight is between 1000 and 500000 daltons. The vibrating membrane is set to vibrate at an over-frequency mode during working, the vibration frequency is 40-50 Hz, and the vibration amplitude is 5-12 mm.
In a preferred embodiment, only flocculant PAC (polyaluminium chloride) is added into the air flotation device, and the adding amount of the flocculant PAC is 10mg/L to 20 mg/L.
In a preferred embodiment, the air flotation scum is collected and then dehydrated, and the dehydrator is a paper bag filter.
According to another aspect of the present disclosure, there is provided a sewage treatment apparatus for carrying out the aforementioned PTFE wastewater treatment process, the apparatus comprising: a raw water tank for storing viscous wastewater; the air flotation device comprises an air flotation water inlet and an air flotation water outlet, and the air flotation water inlet is connected with the raw water tank through a raw water pump; the middle water tank is used for storing air floatation water, and is communicated with an air floatation water outlet of the air floatation device; the pre-filtering device is used for intercepting larger suspended particles and comprises a filtering water inlet and a filtering water outlet, and the filtering water inlet is communicated with the intermediate water tank through an intermediate water pump; the vibrating membrane device comprises a vibrating membrane water inlet end, a vibrating membrane concentrated water end and a vibrating membrane water production end, wherein the vibrating membrane water inlet end is communicated with the filtered water outlet, the vibrating membrane concentrated water end is communicated with the raw water tank, the vibrating membrane concentrated water end is communicated with the vibrating membrane water inlet end, and the vibrating membrane water production end is communicated with the reverse osmosis water inlet tank; the reverse osmosis membrane device is used for separating dissolved solids and comprises a reverse osmosis water inlet end, a reverse osmosis concentrated water end and a reverse osmosis water production end, wherein the reverse osmosis water inlet end is communicated with the reverse osmosis water inlet tank, the reverse osmosis concentrated water end is used for being connected with a concentrated water treatment device, and the reverse osmosis water production end is used for being connected with the reverse osmosis water production tank; the reverse osmosis concentrated water end is also communicated with the reverse osmosis water inlet tank and is used for enabling part of concentrated water generated by the reverse osmosis membrane device to flow back into the reverse osmosis water inlet tank.
In the sewage treatment apparatus according to the present disclosure, the air flotation device is an air flotation machine, and the pre-filtration device is a sand filtration tank.
Preferably, the reverse osmosis membrane device comprises a reverse osmosis water inlet tank, a reverse osmosis water feeding pump, a cartridge filter, a reverse osmosis high-pressure pump and a reverse osmosis membrane assembly; the reverse osmosis water inlet tank is connected with the reverse osmosis water inlet end of the cartridge filter through the reverse osmosis water feed pump; the water outlet end of the cartridge filter is connected with the water inlet end of the reverse osmosis membrane component through the reverse osmosis high-pressure pump; the reverse osmosis concentrated water end and the reverse osmosis water production end are positioned on the reverse osmosis membrane component.
In one embodiment of the sewage treatment apparatus according to the present disclosure, the diaphragm device further includes: the high-frequency system is used for generating strong shearing force and comprises a high-frequency vibration exciter, a vibrating body and a supporting rod; the screening assembly is used for realizing material separation and comprises a vibration tray, a membrane, a 0-type ring retainer and a liquid inlet/outlet channel; a water supply system for delivering wastewater to the screen assembly, the water supply system including a water supply pump, valves, instrumentation, and a filter; and the flushing and cleaning system is used for flushing and cleaning the screening assembly and comprises a cleaning water tank, a control valve and a pipeline pipe fitting.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to the specific details set forth above, and that these and other objects that can be achieved with the present invention will be more clearly understood from the detailed description that follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. The drawings are merely schematic and are not drawn to scale, but are merely illustrative of the principles of the invention. For purposes of illustrating and describing some portions of the present invention, corresponding parts of the drawings may be exaggerated, i.e., may be larger, relative to other components in an exemplary apparatus actually manufactured according to the present invention. In the drawings:
FIG. 1 is a process flow diagram of a viscous waste water treatment system of the prior art;
FIG. 2 is a schematic flow diagram of a PTFE wastewater treatment process for use in accordance with one embodiment of the disclosure;
FIG. 3 is a schematic configuration diagram of a sewage treatment apparatus for carrying out a treatment process of PTFE waste water according to the present invention;
fig. 4 is a schematic view of the structure of a diaphragm device of the treating apparatus shown in fig. 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
It should be emphasized that the term "comprises/comprising/comprises/having" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
Here, it should be noted that the terms of orientation such as "upper" and "lower" appearing in the present specification refer to the orientation relative to the position shown in the drawings; the term "coupled" herein may mean not only directly coupled, but also indirectly coupled, in which case intermediates may be present, if not specifically stated. A direct connection is one in which two elements are connected without the aid of intermediate elements, and an indirect connection is one in which two elements are connected with the aid of other elements. As used herein, "viscous wastewater" refers to wastewater containing a viscous agent or a viscous substance, such as PTFE wastewater, machining wastewater, rubber wastewater, etc., wherein PTFE wastewater may refer to PTFE wastewater produced in the production of polytetrafluoroethylene, and may also refer to other wastewater containing PTFE substances.
In order to facilitate the reader to understand the relevant process more easily, the source of the PTFE waste water is briefly described. In the process of generating suspended polytetrafluoroethylene (PTFE-M) by polymerizing tetrafluoroethylene, deionized water is firstly added into a reaction kettle, then the tetrafluoroethylene and an auxiliary agent are added into the polymerization reaction kettle and mixed after polymerization inhibitor terpene is removed from silica gel, the reaction kettle is heated to a proper temperature by an electric heater, various media are fully contacted by stirring by a stirrer to carry out polymerization reaction, and the temperature of the reaction kettle is controlled by a circulating cooling system in the reaction process. And after the reaction is finished, sending the tetrafluoroethylene mixed solution to a subsequent treatment working section.
The mixture such as polytetrafluoroethylene generated by polymerization is conveyed to a rinsing bath through a pipeline. And (3) cleaning and removing impurities from the mixture in the rinsing bath through water replacement for many times, and enabling pure polytetrafluoroethylene particles to enter a hopper and then enter a dehydration process. The water-containing polytetrafluoroethylene particles continuously enter a vibration dehydrator to remove excessive water.
The waste water generated in the polymerization, water washing and dehydration processes is the PTFE-M waste water.
PMPA is used as an emulsifier in the production of polymerization units in devices for dispersing polytetrafluoroethylene (PTFE-F), polytetrafluoroethylene dispersion (PTFE-D), the organofluoro compounds partly enter the waste water and partly are entrained into the polymer. As the polymer is dried, PMPA is volatilized into the drying tail gas. In order to remove PMPA from the dry tail gas, a waste gas scrubber was provided in the apparatus to absorb PMPA with aqueous sodium hydroxide. The effluent water of the generated wastewater after coagulation, precipitation, air flotation, activated carbon adsorption and ion exchange is PMPA wastewater. The mixed wastewater of the PTFE-M wastewater and the PMPA wastewater is PTFE wastewater. The PTFE wastewater has the characteristics of certain viscosity, TDS 10-420 mg/L, turbidity 1-12.5 NTU, conductivity 172-1324 mu s/cm and pH 3.6-8.4.
In the process flow of the viscous wastewater advanced treatment system according to an embodiment of the invention, the method comprises the following steps:
the viscous waste water enters the raw water tank through a pipeline;
conveying the viscous wastewater to an air floatation device by a raw water pump, adding a flocculating agent into the air floatation device by a medicine adding system, performing flocculation reaction on the viscous wastewater and the flocculating agent in the air floatation device, scraping generated particles into a scum collecting box by a mud scraper, and allowing air floatation effluent to enter an intermediate water tank;
the intermediate water pump conveys the sewage in the intermediate water tank to a pre-filtering device so as to further filter out larger suspended particles in the wastewater; the wastewater filtered by the pre-filtering device enters a vibrating membrane device, concentrated water generated by the vibrating membrane device flows back to an inlet of the vibrating membrane device and an original water tank to enter a system for retreatment, and produced water of the vibrating membrane device automatically flows into a reverse osmosis water inlet tank;
the reverse osmosis water feeding pump conveys sewage in the reverse osmosis water inlet tank to the cartridge filter, and the sewage filtered by the cartridge filter is conveyed to the reverse osmosis membrane device through the reverse osmosis high-pressure pump; the concentrated water produced by the reverse osmosis membrane device can further flow into the concentrated water treatment device, and the produced water of the reverse osmosis membrane device automatically flows into the produced water tank.
Hereinafter, an embodiment of the present invention will be described with reference to fig. 2 of the drawings. In the drawings, the technical scheme of the invention is further described by taking a treatment system for treating PTFE wastewater as a specific embodiment. It should be understood that other viscous wastewater having the same properties as PTFE wastewater are equally suitable for use in the treatment system of this particular embodiment.
Referring to fig. 2, in the treatment process for PTFE wastewater according to the present disclosure, the treatment process includes:
conveying the PTFE wastewater in the raw water tank to an air floatation device;
adding a flocculating agent (PAC in the example) into the reaction tank of the air floatation device, so that the PTFE wastewater is fully mixed with the flocculating agent in the reaction tank of the air floatation device for flocculation reaction to form suspended particles;
then, feeding the PEFE wastewater after the flocculation reaction into an air flotation tank through a middle water inlet hole of an air flotation device, releasing a large number of micro-bubble groups at the bottom of the air flotation tank of the air flotation device, and scraping suspended matters which slowly rise under the carrying of the micro-bubbles and finally float on the water surface into a slag tank by using a slag scraper for subsequent treatment;
inputting the air-floated effluent into an intermediate water tank, and conveying the air-floated effluent of the intermediate water tank into a pre-filtering device for filtering;
directly supplying the outlet water of the pre-filtering device to a vibrating membrane filtering device, and supplying the concentrated water intercepted by the vibrating membrane filtering device to the raw water tank and the water inlet end of the vibrating membrane;
and the produced water filtered and flowed out by the vibrating membrane filtering device is supplied to a reverse osmosis water inlet tank and enters a reverse osmosis membrane device through a water feeding pump, a cartridge filter and a reverse osmosis high-pressure pump.
The air flotation water outlet of the middle water tank can be sent to the pre-filtering device for filtering by using the air flotation water pump. Wherein the pre-filter device may be a sand filter tank, for example.
The vibrating membrane filtering device adopts cross flow filtration. In the cross-flow filtration, the vibrating membrane is configured to: through the high-frequency vibration of the vibrating membrane, water flow generates two component forces on the membrane surface, one component force is a normal force perpendicular to the membrane surface, water molecules penetrate through the membrane surface, and the other component force is a tangential force parallel to the membrane surface, and intercepted matters on the membrane surface are washed away. The vibration membrane enables intercepted matters washed off from the membrane surface to be discharged outside through the concentrated water part and partially flow back through the strong shearing force generated by high-frequency vibration, thereby realizing cross-flow filtration.
The vibrating membrane is an ultrafiltration membrane used for filtering viscous PTFE fine powder, the aperture of the ultrafiltration membrane can be between 10nm and 100nm, and the cut-off molecular weight is between 1000 and 500000 daltons. The vibrating membrane is set to vibrate at an over-frequency mode during working, the vibration frequency is 40-50 Hz, and the vibration amplitude is 5-12 mm.
In a preferred embodiment, only flocculant PAC is added into the air flotation device, and the adding amount of the flocculant PAC is 10mg/L to 20 mg/L.
In a preferred embodiment, the air flotation scum is collected and then dehydrated, and the dehydrator is a paper bag filter.
FIG. 3 is a schematic view of a sewage treatment apparatus for carrying out the above-described PTFE wastewater treatment process. As shown in fig. 3, the sewage treatment apparatus includes a raw water tank, an air flotation device, an intermediate water tank, a pre-filtering device, a vibration membrane device, and a reverse osmosis membrane device. The raw water tank 10 is used for storing PTFE waste water to be treated; the air floatation device 30 is used for separating fine particles in the PTFE wastewater; the middle water tank 40 is used for storing air floatation effluent output by the air floatation device 30; the vibrating membrane device 70 is used for further filtering micro-nano particles and nano-nano particles in the wastewater; the reverse osmosis membrane device is used for separating soluble solids in the wastewater.
The air floatation device 30 is provided with an air floatation water inlet and an air floatation water outlet, the air floatation water inlet is connected with the raw water tank 10 through a raw water pump 20, and the raw water pump 20 is used for conveying the PTFE wastewater in the raw water tank 10 to the air floatation device 30. The air floatation water outlet is connected with an intermediate water tank 40, and the intermediate water tank 40 is used for storing air floatation water output from the air floatation device 30. The pre-filtering device 60 comprises a filtering water inlet and a filtering water outlet, the filtering water inlet is connected with the intermediate water tank 40 through an intermediate water pump 50, and the intermediate water pump 50 is used for conveying the PTFE waste water in the intermediate water tank 40 to the pre-filtering device 60; the pre-filter apparatus 60 receives the wastewater from the intermediate water tank 40 from the intermediate water pump 50 to further reduce the turbidity and suspended matter of the PTFE wastewater. The diaphragm device 70 comprises a diaphragm water inlet end, a diaphragm concentrated water end and a diaphragm water outlet end; the water inlet end of the vibrating membrane is connected with a filtered water outlet of the pre-filtering device 60 and is used for receiving PTFE wastewater which flows out after being filtered by the pre-filtering device 60; the concentrated water end of the vibrating membrane is connected with the original water tank 10 and is used for conveying concentrated water generated by the vibrating membrane device 70 to the original water tank 10 and then to the air floatation device 30 again through the original water pump 20 for retreatment, or the concentrated water end of the vibrating membrane can flow back to the water inlet end of the vibrating membrane and enter the vibrating membrane device again for filtration; the water producing end of the diaphragm may be connected to the reverse osmosis water inlet tank 81 so that the wastewater filtered by the diaphragm device 70 further flows into the reverse osmosis water inlet tank 81. The reverse osmosis membrane device comprises a reverse osmosis water inlet end, a reverse osmosis concentrated water end and a reverse osmosis water production end; the reverse osmosis water inlet end is connected with the reverse osmosis water inlet tank 81 to ensure that the sewage in the reverse osmosis water inlet tank 81 can be further conveyed to a reverse osmosis membrane device 86 for treatment; the reverse osmosis concentrated water end can also be connected with a concentrated water treatment device 86, concentrated water generated by the reverse osmosis membrane device is discharged into the concentrated water treatment device 86 at the moment, and the concentrated water treatment device 86 further treats sewage; the reverse osmosis water production end may be connected to a reverse osmosis water production tank 90.
The reverse osmosis concentrated water end of the reverse osmosis membrane device is communicated with the reverse osmosis water inlet tank 81 except for being connected with the concentrated water treatment device 86, and at the moment, a part of sewage generated by the reverse osmosis membrane device is discharged to the concentrated water treatment device, and a part of sewage flows back to the reverse osmosis water inlet tank 81; the concentrated water refluxed into the reverse osmosis water inlet tank 81 can be treated by the reverse osmosis membrane device again.
The air flotation device 30 may be an air flotation machine, and the air flotation machine includes an air flotation machine reaction tank and a chemical feeding system 31. The dosing system 31 is used for adding a flocculating agent into the reaction tank of the air flotation machine, and the PTFE wastewater and the flocculating agent are fully mixed in the reaction tank of the air flotation machine and are subjected to flocculation reaction. The chemical adding system 31 can be arranged beside a reaction tank of the air floatation machine or can be independently arranged in a chemical adding room.
In the treatment process, PTFE wastewater enters a raw water tank 10 through a pipeline and is then conveyed into a reaction tank of an air floatation machine by a raw water pump 20, and a flocculating agent is added into the reaction tank of the air floatation machine by a dosing system 31; fully mixing PTFE wastewater with a flocculating agent in a reaction tank of an air flotation machine, and carrying out flocculation reaction to form macroscopic suspended particles; then flows into the air flotation tank through a middle water inlet hole of the air flotation machine and is fully contacted with a large number of micro-bubble groups released from the bottom of the tank by the dissolved air tank; suspended matters in the wastewater slowly rise under the carrying of the micro bubbles and adsorb extremely fine particles in the wastewater, and finally float on the water surface and are scraped to a scum collecting tank 32 by a scum scraper; the particles in the scum collecting tank 32 are further dehydrated by a dehydrator, and the dehydrated scum is disposed outside; the dehydrator can be a paper bag dehydrator.
It should be understood that the air floating device 30 may be used in other air floating manners besides the dissolved air floating manner; such as electrolytic air flotation, cavitation air flotation, etc. The electrolytic floatation is to intercept and float flocculated suspended matters to the water surface by tiny bubbles of hydrogen and oxygen generated by electrolysis, so as to achieve the aim of solid-liquid separation; the bubbles generated by the electrolytic air flotation are smaller than the size of the bubbles generated by the dissolved air flotation, and the electrolytic air flotation has the effects of oxidation, decoloration and sterilization in the treatment process. The cavitation air floatation is used for treating various kinds of sewage by adopting the principle of combining mechanical aeration and chemical flocculation, and has the advantages of low investment, low energy consumption and low noise compared with dissolved air floatation.
Further, the flocculating agent can be PAC (polyaluminium chloride), and the adding amount of the PAC can be 10mg/L to 20 mg/L. PTFE powder and other pollutants in the wastewater are subjected to flocculation reaction with PAC, so that the PTFE powder and other pollutants are coagulated into suspended particles; a part of the suspended particles are filtered out in advance through the air floating device 30; the PTFE wastewater treated by the flotation device 30 flows through the flotation outlet to the intermediate water tank 40 for subsequent treatment. The pollutants which are not flocculated into large particles flow into the subsequent vibration membrane device 70 along with the wastewater to be treated, and the vibration membrane device 70 intercepts and conveys the pollutants to the raw water tank 10, and then conveys the pollutants to the air floatation device 30 again through the raw water pump 20 to be treated. It should be understood that the flocculating agent can be used in combination with other flocculating agents besides only PAC.
In one embodiment of the present invention, the pre-filter device 60 employs a sand canister; the middle water tank 40 is connected with the water inlet of the sand filtration tank through a middle water pump 50, and the middle water pump 50 is used for conveying air floatation effluent in the middle water tank 40 to the sand filtration tank; the water outlet of the sand filtration tank is connected with the vibration membrane device 70 to ensure that the sewage filtered by the sand filtration tank is conveyed to the vibration membrane device 70. After the intermediate water pump 50 delivers the sewage in the intermediate water tank 40 to the sand filtration tank, the sand filtration tank further filters out large suspended particles in the sewage to reduce the inflow turbidity, SS (suspended solids), and SDI (sludge density index) of the diaphragm device 70. The water inlet pressure of the sand filtration tank can be set to meet the water inlet pressure requirement of the vibrating membrane device 70, because the water outlet pressure loss of the sand filtration tank is very small under the condition that a water tank and a water lifting pump are not arranged between the sand filtration tank and the vibrating membrane device 70, the difference value between the water outlet pressure and the water inlet pressure is very small, and the sand filtration tank conveys sand filtration outlet water into the vibrating membrane device 70 by utilizing the excess pressure of the outlet water; in order to ensure the stable operation of the process of the diaphragm device 70, it should be ensured that the water inlet pressure of the sand filtration tank needs to meet the pressure requirement of the diaphragm device 70. It should be understood that the main function of the pre-filtering device 60 is to pre-filter the sewage before it enters the diaphragm device 70 to remove large suspended particles, which can be replaced by other pre-filtering devices besides the sand filter tank; such as a multi-media filter, etc.
In some embodiments, the separation membrane in the vibrating membrane device 70 is an ultrafiltration membrane, the pore size of which is selected to be between 10nm and 100nm, and the molecular weight cut-off of which is between 1000 and 500000 daltons; specifically, the membrane pore size of the ultrafiltration membrane may be set to 50 nm. During specific filtration, the ultrafiltration membrane takes the pressure difference on two sides of the membrane as a driving force and the ultrafiltration membrane as a filter medium to realize the purposes of purification, separation and concentration of the stock solution; therefore, the filter has the characteristics of good filtering effect and strong stability. The anti-pollution performance of the vibrating membrane is strong, the type and the adding amount of the medicament added into the system are small, and the powdered activated carbon does not need to be added in the treatment process, so that the generation of hazardous wastes is avoided. The sewage after the sand filtration device filters further gets into the vibrating membrane device 70 and handles, and residual little, nano-particle, colloid, bacterium, macromolecule organic matter in the sewage are got rid of to the vibrating membrane device 70 to satisfy reverse osmosis membrane device's requirement of intaking. It should be understood that the pore size of the vibrating membrane can be selected according to the size of the organic matter to be filtered, for example, a microfiltration membrane, an ultrafiltration membrane, a nanofiltration membrane, or the like; the material can be polyether sulfone, polyvinylidene fluoride or polyamide, etc.
Further, the vibrating ultrafiltration membrane may be a cross-flow filtration as described above. The cross-flow filtration causes the filtrate to be filtered out in a tangential-flow mode; and the unfiltered liquid forms turbulent flow due to high-speed movement, the surface of the membrane is continuously washed, and a small amount of solid matters attached to the membrane are taken away, so that the blockage of the filter membrane is prevented, and the normal operation of filtration is kept. The recovery rate of the cross-flow filtration can reach more than 90 percent, the water yield of a single vibration ultrafiltration membrane reaches more than 300L/h, and the average value of the turbidity of the produced water reaches less than 0.33 NTU.
In one embodiment of the present invention, the diaphragm assembly 70 includes a high frequency system, a screen assembly, a water supply system, and a flushing and cleaning system. The sewage treated by the sand filtration device is conveyed to a water inlet system of the vibrating membrane device 70 through a sand filtration water outlet, and the water inlet system conveys the sewage to the screening component; the high-frequency system generates high-frequency motion and drives the screening assembly to realize material separation.
As shown in fig. 4, the high frequency system includes a high frequency vibration exciter 72, a vibration body 71 and a support rod 73, the high frequency vibration exciter 72 generates high frequency vibration, the vibration body 71 transmits the high frequency vibration generated by the high frequency vibration exciter 72 to the support rod 73, the support rod 73 drives the sieving assembly to vibrate, so that the membrane generates strong shearing force and normal force to float the viscous powder in the PTFE wastewater from the surface of the membrane, and the viscous powder flows out of the membrane system along with the concentrated water forming a turbulent flow effect, thereby greatly reducing the blockage and pollution of the membrane pores, slowing down the decrease of the water flux generated by the membrane or the rising trend of the pressure difference of the system, and prolonging the chemical cleaning period of the membrane.
The screen assembly includes a vibratory tray 74, a membrane, a 0-ring retainer, and inlet/outlet fluid passageways; the vibration tray 74 is used for supporting the diaphragm assembly 75, and when the vibration tray 74 is specifically arranged, the vibration tray 74 can be arranged below the diaphragm assembly 75, and the vibration tray 74 is connected with the support rod 73; at this time, the high frequency motion of the support rod 73 can be transmitted to the diaphragm assembly 75 through the vibration tray 74. It should be understood that the membranes in the screen assemblies may be microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, and the like. Due to the vibration effect of the screening component, the membrane inside the screening component becomes a vibrating membrane, the filtering speed of the vibrating membrane is higher than that of a traditional static membrane, and the shearing force is generated by the vibration of the membrane and does not depend on the flow velocity of feed liquid entering the membrane; therefore, compared with the traditional static membrane, the energy consumption is reduced, the filtration efficiency is improved, and the pollution resistance is enhanced.
The water supply system comprises a water supply pump, a valve, an instrument and a filter, and the water supply pump conveys wastewater into the screening assembly at certain pressure and flow; the filter is arranged in the water supply system and is used for filtering large-particle impurities in the wastewater so as to protect the membrane in the screening component from being damaged or blocked; the valve is used for controlling the on-off of the water supply system; for example, when servicing or cleaning the screen assemblies, the feed lines to the water system may be shut off by closing a valve.
The water produced by the vibrating membrane almost does not contain viscous PTFE powder, and the turbidity is stable at a lower value, so that excellent water inlet quality is provided for the subsequent reverse osmosis membrane, and the stable operation of a reverse osmosis membrane system is ensured. During the treatment process, the screen assemblies are inevitably contaminated with PTFE powder, and proper flushing or cleaning of the screen assemblies is required to avoid clogging of the screen assemblies of the vibrating membrane system due to the accumulation of PTFE powder over time. The washing and cleaning system of the screening assembly comprises a washing water tank, a control valve and a pipeline pipe fitting. The cleaning water in the cleaning water tank is conveyed to the membrane of the screening component through a pipeline so as to realize cleaning or flushing of the membrane; the cleaning water in the cleaning water tank can be selected from clear water or water containing a chemical cleaning agent according to actual needs, and accordingly, clear water flushing and chemical cleaning of the diaphragm are achieved. The control valve is used for controlling the opening and closing of the flushing and cleaning system. The washing and cleaning system realizes the automation of the cleaning of the screening components and solves the difficulty of manually cleaning the membrane system.
Further, the vibration amplitude of the high frequency system in the diaphragm device 70 may be set to 9 mm. The vibration amplitude is a non-negligible factor affecting the screening effect of the screening assemblies; the amplitude is increased, the blocking phenomenon of the sieve pores can be greatly reduced, and the materials are also beneficial to layering; but too large an amplitude will be more damaging to the equipment. Therefore, the magnitude of the vibration should be selected based on the application, e.g., when the size of the material to be screened is relatively small, the magnitude of the vibration of the screen assemblies should be correspondingly increased; because the polytetrafluoroethylene powder in the PTFE waste water is extremely tiny (nanometer) and has certain viscidity, the vibrating diaphragm adopts the super-frequency vibration technique, and its vibration range can set up to 9mm, and this setting has effectively reduced the speed that the separation membrane surface particulate matter piles up the jam. Compared with a conventional micro/ultrafiltration membrane device, the sieving component adopts an over-frequency vibration technology, so that the phenomenon that sieve pores are easily blocked in the running process is avoided, and the condition that the pressure difference of a separation membrane rises quickly and needs to be cleaned frequently is avoided.
In one embodiment of the present invention, the reverse osmosis membrane apparatus includes a reverse osmosis water inlet tank 81, a reverse osmosis water feed pump 82, a cartridge filter 83, a reverse osmosis high pressure pump 84, and a reverse osmosis membrane module 85. The reverse osmosis water inlet tank 81 is communicated with a vibrating membrane water production end of the vibrating membrane device, so that the wastewater filtered by the vibrating membrane device is further conveyed into the reverse osmosis water inlet tank 81 through the vibrating membrane water production end; the reverse osmosis water inlet end of the cartridge filter 83 is connected with the reverse osmosis water inlet tank 81 through a reverse osmosis water feed pump 82, and the reverse osmosis water feed pump 82 is used for conveying sewage in the reverse osmosis water inlet tank 81 into the cartridge filter 83; the security filter 83 further filters fine substances in the sewage to meet the requirement of the subsequent reverse osmosis membrane component 85 on water inflow; the water outlet end of the cartridge filter 83 is connected with the water inlet end of the reverse osmosis membrane module 85 through a reverse osmosis high-pressure pump 84, and the reverse osmosis high-pressure pump 84 is used for conveying the sewage filtered by the cartridge filter 83 to the reverse osmosis membrane module 85. The reverse osmosis membrane assembly 85 also comprises a reverse osmosis concentrated water end and a reverse osmosis water producing end; the reverse osmosis concentrated water end can be connected with an external concentrated water treatment device 86, so that concentrated water generated by the reverse osmosis membrane device flows into the concentrated water treatment device 86 from the reverse osmosis concentrated water end, and is further treated by other processes; the reverse osmosis water production end may be connected to the reverse osmosis water production tank 90 for flowing the water produced after treatment by the reverse osmosis membrane device from the reverse osmosis water production end into the reverse osmosis water production tank 90.
According to the embodiment, the viscous wastewater advanced treatment system provided by the embodiment of the invention treats viscous wastewater by using the vibrating membrane filtering device, and floats solid pollutants in inlet water from the surface of the membrane by adopting cross-flow filtration combined with high-frequency vibration generated by the vibrating membrane device, so that the blockage of membrane pores is avoided, and secondary pollutants are avoided without adding activated carbon; the filter speed of vibrating diaphragm is bigger than traditional static membrane, and the shearing force is produced by diaphragm self vibration, does not rely on the feed liquid velocity of flow who advances the membrane, compares and has lower energy consumption, better filter effect and stronger antipollution in traditional static membrane.
In the present disclosure, the PTFE wastewater treatment and recycling system can operate stably, i.e., the produced water flux of the vibrating membrane system and the reverse osmosis membrane system is stable, and the system differential pressure rises slowly; the chemical cleaning period of the vibration membrane is more than half a month, and the pressure difference of the vibration membrane system can be basically recovered to the initial value after the chemical cleaning. No hazardous waste is generated due to the powdered activated carbon which adsorbs pollutants in the system operation process.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments in the present invention.
The above-mentioned embodiments illustrate and describe the basic principles and main features of the present invention, but the present invention is not limited to the above-mentioned embodiments, and those skilled in the art should make modifications, equivalent changes and modifications without creative efforts to the present invention within the protection scope of the technical solution of the present invention.
Claims (10)
1. A treatment process for PTFE wastewater, characterized by comprising:
conveying the PTFE wastewater in the raw water tank to an air floatation device;
adding a flocculating agent into a reaction tank of the air floatation device, so that the PTFE wastewater is fully mixed with the flocculating agent in the reaction tank of the air floatation device for flocculation reaction to form suspended particles;
feeding PEFE wastewater after flocculation reaction into an air flotation tank through a middle water inlet hole of an air flotation device, releasing a large number of micro-bubble groups at the bottom of the air flotation tank of the air flotation device, and scraping suspended matters which slowly rise under the carrying of the micro-bubbles and finally float on the water surface into a slag tank by using a slag scraper for subsequent treatment;
inputting the air-floated effluent into an intermediate water tank, and conveying the air-floated effluent of the intermediate water tank into a pre-filtering device for filtering;
directly supplying the outlet water of the pre-filtering device to a vibrating membrane filtering device, and supplying the concentrated water intercepted by the vibrating membrane filtering device to the raw water tank and the water inlet end of the vibrating membrane filtering device;
and the produced water filtered and flowed out by the vibrating membrane filtering device is supplied to a reverse osmosis water inlet tank and enters a reverse osmosis membrane device through a water feeding pump, a cartridge filter and a reverse osmosis high-pressure pump.
2. The process of claim 1, wherein the vibrating membrane filtration device employs cross-flow filtration.
3. The treatment process according to claim 2, wherein the vibrating membrane is an ultrafiltration membrane for filtering viscous PTFE fine powder, the aperture of the ultrafiltration membrane is between 10nm and 100nm, and the cut-off molecular weight is between 1000 and 500000 daltons.
4. The process according to any one of claims 1 to 3, wherein the vibrating membrane is set to vibrate at an over frequency during operation, wherein the frequency of vibration is 40 to 50Hz, and the amplitude of vibration is 5 to 12 mm.
5. The process according to claim 4, wherein only flocculant PAC is added into the air flotation device, and the addition amount of the flocculant PAC is 10mg/L to 20 mg/L.
6. The process according to claim 5, wherein the air flotation scum is collected and then dehydrated, and the dehydrator is a paper bag filter.
7. A sewage treatment apparatus for carrying out the treatment process for PTFE wastewater according to any one of claims 1 to 6, characterized by comprising:
a raw water tank for storing viscous wastewater;
the air flotation device comprises an air flotation water inlet and an air flotation water outlet, and the air flotation water inlet is connected with the raw water tank through a raw water pump;
the middle water tank is used for storing air floatation water, and is communicated with an air floatation water outlet of the air floatation device;
the pre-filtering device is used for intercepting larger suspended particles and comprises a filtering water inlet and a filtering water outlet, and the filtering water inlet is communicated with the intermediate water tank through an intermediate water pump;
the vibrating membrane device comprises a vibrating membrane water inlet end, a vibrating membrane concentrated water end and a vibrating membrane water production end, wherein the vibrating membrane water inlet end is communicated with the filtered water outlet, the vibrating membrane concentrated water end is communicated with the raw water tank, the vibrating membrane concentrated water end is communicated with the vibrating membrane water inlet end, and the vibrating membrane water production end is communicated with the reverse osmosis water inlet tank;
the reverse osmosis membrane device is used for separating dissolved solids and comprises a reverse osmosis water inlet end, a reverse osmosis concentrated water end and a reverse osmosis water production end, wherein the reverse osmosis water inlet end is communicated with the reverse osmosis water inlet tank, the reverse osmosis concentrated water end is used for being connected with a concentrated water treatment device, and the reverse osmosis water production end is used for being connected with the reverse osmosis water production tank; the reverse osmosis concentrated water end is also communicated with the reverse osmosis water inlet tank and is used for enabling part of concentrated water generated by the reverse osmosis membrane device to flow back into the reverse osmosis water inlet tank.
8. The wastewater treatment apparatus according to claim 7, wherein the air flotation device is an air flotation machine and the pre-filtering device is a sand filter tank.
9. The wastewater treatment apparatus according to claim 7, wherein the reverse osmosis membrane device comprises a reverse osmosis water inlet tank, a reverse osmosis water feed pump, a cartridge filter, a reverse osmosis high-pressure pump, and a reverse osmosis membrane module; the reverse osmosis water inlet tank is connected with the reverse osmosis water inlet end of the cartridge filter through the reverse osmosis water feed pump; the water outlet end of the cartridge filter is connected with the water inlet end of the reverse osmosis membrane component through the reverse osmosis high-pressure pump; the reverse osmosis concentrated water end and the reverse osmosis water production end are positioned on the reverse osmosis membrane component.
10. The sewage treatment apparatus of claim 7, wherein the diaphragm device further comprises:
the high-frequency system is used for generating strong shearing force and comprises a high-frequency vibration exciter, a vibrating body and a supporting rod;
the screening assembly is used for realizing material separation and comprises a vibration tray, a membrane, a 0-type ring retainer and a liquid inlet/outlet channel;
a water supply system for delivering wastewater to the screen assembly, the water supply system including a water supply pump, valves, instrumentation, and a filter;
and the flushing and cleaning system is used for flushing and cleaning the screening assembly and comprises a cleaning water tank, a control valve and a pipeline pipe fitting.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130206692A1 (en) * | 2010-10-28 | 2013-08-15 | Shiwen Zhang | Tanning wastewater treatment and recycling method based on nano-catalytic electrolysis technology and membrane technology |
| KR20190007916A (en) * | 2017-07-14 | 2019-01-23 | 두산중공업 주식회사 | Energy-saving water treatment system |
| CN211570290U (en) * | 2019-12-24 | 2020-09-25 | 江苏众志新禹环境科技有限公司 | Over-frequency vibration nanofiltration reverse osmosis system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130206692A1 (en) * | 2010-10-28 | 2013-08-15 | Shiwen Zhang | Tanning wastewater treatment and recycling method based on nano-catalytic electrolysis technology and membrane technology |
| KR20190007916A (en) * | 2017-07-14 | 2019-01-23 | 두산중공업 주식회사 | Energy-saving water treatment system |
| CN211570290U (en) * | 2019-12-24 | 2020-09-25 | 江苏众志新禹环境科技有限公司 | Over-frequency vibration nanofiltration reverse osmosis system |
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