CN102329022A - Drinking water treatment device based on ultrafiltration device - Google Patents

Drinking water treatment device based on ultrafiltration device Download PDF

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Publication number
CN102329022A
CN102329022A CN201110257418A CN201110257418A CN102329022A CN 102329022 A CN102329022 A CN 102329022A CN 201110257418 A CN201110257418 A CN 201110257418A CN 201110257418 A CN201110257418 A CN 201110257418A CN 102329022 A CN102329022 A CN 102329022A
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CN
China
Prior art keywords
water
ultra
filtration equipment
ultrafiltration
water outlet
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Pending
Application number
CN201110257418A
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Chinese (zh)
Inventor
刘文杰
祖良
周立凡
张林生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gd Loongwater Nanjing Mem-Technology Co Ltd
Southeast University
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Gd Loongwater Nanjing Mem-Technology Co Ltd
Southeast University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gd Loongwater Nanjing Mem-Technology Co Ltd, Southeast University filed Critical Gd Loongwater Nanjing Mem-Technology Co Ltd
Priority to CN201110257418A priority Critical patent/CN102329022A/en
Publication of CN102329022A publication Critical patent/CN102329022A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a drinking water treatment device based on an ultrafiltration device, which comprises a primary lift pump, a coagulation sedimentation basin, an ultrafiltration device and a clean water basin. A huge sand filtering basin in the traditional water making process is omitted. The water outlet of the primary lift pump is connected with the water inlet of the coagulation sedimentation basin. The water outlet of the coagulation sedimentation basin is connected with an adsorption reaction basin through a pipe. The water outlet of the adsorption reaction tank is connected with the water inlet of the ultrafiltration device through a water ultrafiltration pump. The water outlet of the ultrafiltration device is connected with the water inlet of the clean water basin. The drinking water treatment device based on the ultrafiltration device disclosed by the invention has the advantages that the filtering accuracy is high, the turbidity of outlet water is low and the quality of the outlet water is obviously promoted; various pollutants such as soluble organic matters, bacteria, viruses and the like can be removed from the water; the chlorine dosage can be reduced, the generation of chlorinated byproducts is avoided, the safety of drinking water is guaranteed, the taste of the water is further improved and the requirement of raising drinking water standards is satisfied; and the equipment investment is lower than the equipment investment of the traditional drinking water treatment process.

Description

A kind of appliance for treating drinking water based on ultra-filtration equipment
Technical field
The present invention relates to the drinking water treatment technology, relate in particular to a kind of appliance for treating drinking water based on ultra-filtration equipment.
Background technology
At present, domestic conventional water preparation process is a traditional technology, i.e. coagulation, deposition, filtration (sand filtration), sterilization.Along with the continuous deterioration of surface water quality and the raising of water quality standard for drinking water, traditional water preparation process has been difficult to satisfy fully drinking-water quality requirement up to standard gradually.
In the tradition water preparation process, sand filtration technology floor space is big, water distribution system is had relatively high expectations, and filtering accuracy is low, and delivery turbidity is about 1NTU.In the practical applications, except that need ensured strict design, mounting condition, also needs safeguarded regularly, overhaul, otherwise were difficult to guarantee the normal purifying water effect of sand filtration system.
On the other hand, along with developing rapidly of industrial and agricultural production, a large amount of pollution substances are drained into surface drainage system, have caused contaminated water source.The water treatment capacity of traditional technology is limited, can't effectively remove the pollution substance of trace in the water, and difficulty satisfies China's requirement growing to drinking-water quality.
In view of this, be reply micro polluted source and burst Pollution situation, that present domestic research is more is " ozone-biological activated carbon " (O 3-BAC) technology.This technology is to COD MnClearance is merely 15-25%, and (AOC) almost can not remove to refractory organic; Micro activated carbon particle is inevitably carried in this technology water outlet meeting secretly, has a large amount of bacteriums in these particulates, can't thoroughly kill through sterilizing; In addition, this technology construction cost is high, and running technology is complicated, should not promote on a large scale.Therefore, be necessary to develop the novel drinking water treatment process that is applicable to existing water quality condition, ensure that resident's tap water is healthy.
Ultrafiltration (hereinafter to be referred as UF) is a kind of development water treatment new technology rapidly, obtains widespread use in a plurality of fields at present, and ultrafiltration in the main application characteristic in drinking water treatment field is:
(1) can remove most absurd creatures, delivery turbidity can remain in the 0.1NTU;
(2) can remove nearly all bacterium and most virus;
(3) low molecular melting organic matter had the part clearance;
(4) the project occupation of land area is little, and it is convenient to install, overhaul.
At present domestic existing many gacs and ultra-filtration technique are to the individual event or the combination research achievement of the advanced treatment of water; But majority is applied to after traditional drinking water treatment technology; Promote and support link as water quality, increased cost of investment on the one hand, also brought higher working cost on the other hand; This make ultrafiltration technology in the drinking water treatment field slower development, influenced the application in this field of ultrafiltration technology.
Summary of the invention
Goal of the invention: in order to overcome the deficiency that exists in the prior art; The present invention provides a kind of appliance for treating drinking water based on ultra-filtration equipment; Substitute the sand filtration technology of traditional technology system water through ultra-filtration equipment; Reduce cost of investment, improve effluent quality, and reduce the chlorination of drinking water amount, prevent chlorinated secondary product generation, increase drinking water safety property, improve the tap water mouthfeel.
Technical scheme: for realizing above-mentioned purpose, the technical scheme that the present invention adopts is:
A kind of appliance for treating drinking water based on ultra-filtration equipment; Comprise one-level lift pump, coagulative precipitation tank, ultra-filtration equipment and clean water basin; Filtering basin huge in traditional water preparation process have been deducted; The water outlet of said one-level lift pump connects the water-in of coagulative precipitation tank, and the water outlet of coagulative precipitation tank connects the water-in of ultra-filtration equipment through the ultrafiltration water pump, and the water outlet of ultra-filtration equipment connects clean water basin.
This device does not adopt sand filtration technology, and its former water directly gets into ultra-filtration equipment and filters through coagulation basin coagulation, inclined-plate clarifying basin post precipitation, finally accomplishes the separation of holding back of PM for particulate matter, and the product water after the filtration directly gets into clean water basin, promptly available pipe network is supplied water; Ultra-filtration equipment can effectively be removed bacterium and the virus in the former water, can reduce the chlorine dosage of follow-up system, reduces the generation of chlorinated secondary product, makes drinking water safety property higher, and mouthfeel is better.
This device also comprises the absorption reaction pond, and said absorption reaction pond is connected between coagulative precipitation tank and the ultra-filtration equipment.
During the generation burst Pollution, former water can add an amount of Powdered Activated Carbon behind coagulating sedimentation, make the former water behind coagulating sedimentation carry out absorption reaction earlier, gets into ultra-filtration equipment afterwards again when handling micro-polluted source water or at the water source; At this moment, this device also should comprise the Powdered Activated Carbon throwing device that adds Powdered Activated Carbon to the absorption reaction pond, and in the absorption reaction pond, whipping appts is set; Add Powdered Activated Carbon in the absorption reaction pond like this after whipping appts stirs; Mix fully with water, under certain hydraulics, accomplish the absorption reaction process, the pollutent in the water is transferred to solid phase from liquid phase; Remove through ultra-filtration equipment then, reach the purpose of purification of water quality; The residence time of absorption reaction pond in the absorption reaction pond can be set according to water quality, the water yield, is generally 20min--30min.
Above-mentioned Powdered Activated Carbon throwing device can connect a gac dosage gear, and this gac dosage gear can be according to the dosage of water quality, water yield control gac; This gac dosage gear can be realized through PLC.
When need not to add Powdered Activated Carbon, use as middle pond in the absorption reaction pond; When needs added Powdered Activated Carbon, domestic demand guaranteed hydraulic gradient and the competent reaction times that absorption reaction is necessary in the absorption reaction pond, to guarantee adsorption effect; Ultra-filtration equipment can guarantee to hold back the Powdered Activated Carbon of accomplishing after the adsorption, removes pollution factor in the water.
Said ultra-filtration equipment adopts external-compression type PVDF polysulfone hollow fiber ultrafiltration membrane system; It is on average held back, and the aperture is 0.03 μ m (being far smaller than the average grain particle diameter of Powdered Activated Carbon), the monofilm flux is big, filtering accuracy is high, long service life; Utilize the accurate strainability of external-compression type PVDF polysulfone hollow fiber ultrafiltration membrane system; Bacterium, virus, particulate, macromolecular substance and Powdered Activated Carbon in can elimination water, to pollutent hold back effective.
According to the running condition of external-compression type PVDF polysulfone hollow fiber ultrafiltration membrane system, can design ultra-filtration equipment is that grossflow filtration or cross flow filter (normally produce under the regimen condition, can adopt the grossflow filtration mode; When handling micro polluted source or reply burst Pollution adding Powdered Activated Carbon, filter type adopts the cross flow filter mode); External-compression type PVDF polysulfone hollow fiber ultrafiltration membrane system can filter most bacterium and virus, and effluent quality has bigger lifting than sand filtration technology, can stablize to reach country's " drinking water sanitary standard " (GB5749-2006) requirement.
This device also comprises positive cleaning device and the backwash device that ultra-filtration equipment is washed; Said backwash device comprises backwash water pump and deep bed filter; The water-in of said backwash water pump connects the backwash feed water inlet of clean water basin; The backwash water pump connects the water outlet of ultra-filtration equipment through deep bed filter, and the backwash water outlet is arranged on the inlet end of ultra-filtration equipment; What said positive cleaning device comprised the water outlet end that is arranged on ultra-filtration equipment just washes out the mouth of a river.
Each cycle of ultra-filtration equipment operation; Need wash out ultra-filtration equipment through the materials such as trapped substance and Powdered Activated Carbon that just washing of setting-positive washing action of back flushing-secondary will be attached on the ultra-filtration membrane; Thereby reach the purpose of removing impurity in the water, parameters such as its flush time, flushing cycle, operation membrane flux, WP can be confirmed according to concrete water quality situation.Thereby; After finishing filtration cycle, ultra-filtration equipment as the positive wash water of ultra-filtration membrane, will produce water as the ultra-filtration membrane backwash water with former water; The trapped substance and the materials such as Powdered Activated Carbon of inefficacy that are attached on the ultra-filtration membrane are washed out ultra-filtration equipment, make ultra-filtration equipment get into the next cycle of operation.Working shaft when the backwash water pump is the ultra-filtration equipment backwash, the security personnel's strainer when deep bed filter is the ultra-filtration equipment backwash can effectively stop the particle object to get in the ultra-filtration equipment, stops up or scrape the damage ultra-filtration membrane.
This device also can comprise the PLC system control device, between the water-in of the water outlet of ultra-filtration equipment and clean water basin, also is provided with magnetic flow meter; Between the water-in of ultrafiltration water pump and ultra-filtration equipment, just wash out between the water-in of water outlet and clean water basin of place, the mouth of a river, backwash water outlet place, ultra-filtration equipment, the water outlet and the deep bed filter of ultra-filtration equipment be respectively equipped with operated pneumatic valve; The data transmission terminal of said magnetic flow meter and all operated pneumatic valves is connected on the PLC system control device.
The correlation parameter that gac dosage gear and just washing-back flushing-secondary is just washing can directly design through above-mentioned PLC system control device.
The water-in of said ultra-filtration equipment, the water outlet of ultra-filtration equipment all are provided with teletransmission tensimeter and tensimeter on the spot; The water outlet of said ultra-filtration equipment is provided with remote control liquid flowmeter and under meter on the spot; Said teletransmission tensimeter and on the spot tensimeter, remote control liquid flowmeter and on the spot the data transmission terminal of under meter can also be connected on the above-mentioned PLC system control device.
Beneficial effect: the appliance for treating drinking water that the present invention improves based on ultra-filtration equipment; Compared with prior art have following advantage: 1, utilize ultra-filtration equipment to substitute the sand filtering device in the traditional technology, its filtering accuracy is high, delivery turbidity is low, stable effluent quality and water quality promote obviously; 2, utilize Powdered Activated Carbon to have the adsorption function of flourishing microvoid structure and huge specific surface area; In conjunction with the micropore of ultra-filtration membrane fine particle efficiently held back function; Than tradition feedwater advanced treatment process, on removal lower-molecular substance efficient, have greatly improved; " Powdered Activated Carbon-ultra-filtration membrane " combination process is applied to drinking water deep and handles, and can from water, remove dissolved organic matter (COD Mn, UV 254, DOC etc.), multiple pollution substances such as bacterium, virus, can reduce chlorine dosage simultaneously, reduce the generation of chlorinated secondary product, guarantee safety of drinking water property, and further improve the mouthfeel of water, can satisfy the hygienic requirements of tap water; 3, the ultra-filtration membrane monomer removes and installs simply, maneuvering ability is high, maintenance is convenient; 4, device startup travelling speed is fast, equipment operation level of automation is high, operational administrative is simple and running cost is low; 5, economic and technical norms: cancellation sand filtration technology makes about 100~150 yuan/ton of waterworks construction cost savings (in 400~450 yuan/ton of sand filtration system construction costs, 280~300 yuan of/ton calculating of ultrafiltration system construction cost); When need not to add Powdered Activated Carbon, this device increases by 0.008 yuan/ton of operation energy consumption approximately when promoting effluent quality; When handling micro polluted source, add Powdered Activated Carbon 4~6mg/L when following, increase by 0.028~0.038 yuan/ton of working cost approximately; When handling the burst polluted source; Conventional apparatus and this device all need add Powdered Activated Carbon to guarantee effluent quality; Adding Powdered Activated Carbon is generally below the 30mg/L; The working cost of this device increases the Powdered Activated Carbon expense and totally 0.028~0.038 yuan/ton of the operation electricity charge (wherein the Powdered Activated Carbon expense increases about 0.02~0.03 yuan/ton, and the operation electricity charge increase about 0.008 yuan/ton).
Description of drawings
Fig. 2 is a ultra-filtration equipment structural representation of the present invention;
Fig. 1 is the former water treatment technological process synoptic diagram of ultra-filtration equipment.
Embodiment
Below in conjunction with accompanying drawing the present invention is done explanation further.
Be illustrated in figure 1 as a kind of appliance for treating drinking water based on ultra-filtration equipment; The positive cleaning device and backwash device and the PLC system control device that comprise one-level lift pump, coagulative precipitation tank 1, absorption reaction pond 2, ultra-filtration equipment 3, clean water basin 4, ultra-filtration equipment 3 is washed; The water outlet of said one-level lift pump connects the water-in of coagulative precipitation tank 1; The water outlet of coagulative precipitation tank 1 connects the water-in in absorption reaction pond 2; The water outlet in absorption reaction pond 2 connects the water-in of ultra-filtration equipment 3 through ultrafiltration water pump 5, and the water outlet of ultra-filtration equipment 3 connects clean water basin 4; In absorption reaction pond 2, also be provided with whipping appts, and above absorption reaction pond 2, be provided with the Powdered Activated Carbon throwing device, on the Powdered Activated Carbon throwing device, be connected with gac dosage gear; Said ultra-filtration equipment 3 adopts external-compression type PVDF polysulfone hollow fiber ultrafiltration membrane system; Said backwash device comprises backwash water pump 6 and deep bed filter 7; The water-in of said backwash water pump 6 connects the backwash feed water inlet of clean water basin 4; Backwash water pump 6 connects the water outlet of ultra-filtration equipment 3 through deep bed filter 7, and the backwash water outlet is arranged on the inlet end of ultra-filtration equipment 3; What said positive cleaning device comprised the water outlet end that is arranged on ultra-filtration equipment 3 just washes out the mouth of a river; Between the water-in of the water outlet of ultra-filtration equipment 3 and clean water basin 4, also be provided with magnetic flow meter; Between the water-in of ultrafiltration water pump 5 and ultra-filtration equipment 3, just wash out between the water-in of water outlet and clean water basin 4 of place, the mouth of a river, backwash water outlet place, ultra-filtration equipment 3, the water outlet and the deep bed filter 7 of ultra-filtration equipment 3 be respectively equipped with operated pneumatic valve; All be provided with teletransmission tensimeter and tensimeter on the spot at the water outlet of the water-in of ultra-filtration equipment 3 and ultra-filtration equipment 3; Be provided with remote control liquid flowmeter and under meter on the spot at the water outlet of ultra-filtration equipment 3; The data transmission terminal of said magnetic flow meter, all operated pneumatic valves, teletransmission tensimeter and manometric on the spot data transmission terminal, remote control liquid flowmeter and on the spot the data transmission terminal of under meter be connected on the PLC system control device; Gac dosage gear is also through the design of PLC system control device, and the correlation parameter of positive flushing arrangement and back-purge system is also through this PLC system control device design; Water body and Powdered Activated Carbon flow to as shown in Figure 2 in the ultra-filtration equipment.
Said apparatus is applicable to micro-polluted water advanced treatment and water source burst pollution process field, removes body dissolved organic matter and burst pollution substance in the source water, the periodic duty automatically of said PLC system control device this device of control, and the related process parameter is following:
When (1) adopting the water outlet of " ultrafiltration " single art breading coagulative precipitation tank, turbidity removal rate reaches more than 99%, can maintain below the 0.1NTU;
When (2) adopting the water outlet of " ultrafiltration " single art breading coagulative precipitation tank, COD Mn, DOC, UV 254Progressively reduce Deng the increase of the clearance of principal pollutant, when the ultra-filtration membrane flux is selected 75~85L/m along with membrane flux 2During h, COD Mn, DOC, UV 254Can reach higher removal etc. main Micropollutants;
When (3) adopting " Powdered Activated Carbon-ultrafiltration " combination process to handle the coagulative precipitation tank water outlet, Powdered Activated Carbon order number is high more, and adsorption effect is good more, COD Mn, DOC, UV 254High more etc. main Micropollutants clearance, to recommend to select 200 order Powdered Activated Carbons for use, under the normal running (operation) conditions, dosage can be selected 4~12mg/L, and concrete numerical value is looked the water quality situation and is decided.
The concrete workflow of said apparatus is following:
One, Powdered Activated Carbon absorption (when needs)
Dosing method: directly add in the absorption reaction pond 2;
Adsorption time: confirm by processing parameter according to influent quality, the water yield, can be 20~30min.
Two, ultrafiltration membrance filter
Open water pump: ultrafiltration water pump 5;
Valve opening and closing: open and produce water valve 9, water intaking valve 8, cross-flow valve 10 (when needs);
Time length: specifically confirm according to water quality;
Filter type: grossflow filtration/cross flow filter;
Membrane flux: specifically confirm according to water quality;
Process prescription: the drainage of treating in the absorption reaction pond 2 gets into ultra-filtration equipment 3 through 5 superchargings of ultrafiltration water pump; Water is from the inboard ultrafiltration membranous wall that sees through of film silk; Come together in water purification side in the hyperfiltration membrane assembly, be transported to clean water basin through the rising pipe that is connected with the hyperfiltration membrane assembly water outlet.
Three, flushing
Flush sequence is: square impact-last recoil-following recoil-secondary square impact.
A. square impact
Opening device: ultrafiltration water pump 5;
Valve opening and closing: open square impact valve (water intaking valve) 8, upper scum valve 11;
Time length: 10-20s;
Process prescription: former water gets into from membrane module bottom, washes away membranous wall in film silk inboard, the inboard pollutent of film silk is just being washed drain by membrane module discharging.
B. go up recoil
Opening device: backwash water pump 6;
Valve opening and closing: open backwash valve 12, just wash bleed valve (upper scum valve) 11;
Time length: 10-30s;
Process prescription: backwash is filtering inverse process, and filter back water oppositely sees through the ultrafiltration membranous wall through backwash water pump 6 by membrane module water purification side, and fenestra internal contamination thing is taken out of, is just washing drain through membrane module and is discharging.
C. recoil down
Opening device: backwash water pump 6;
Valve opening and closing: open backwash valve 12, backwash bleed valve 13;
Time length: 10-30s;
Process prescription: filter back water oppositely sees through the ultrafiltration membranous wall through backwash water pump 6 by membrane module water purification side, and fenestra internal contamination thing is taken out of, discharges through membrane module backwash drain.
D. secondary square impact
Opening device: one-level lift pump;
Valve opening and closing: open square impact valve 8, just wash bleed valve 11;
Time length: 10-20s;
Process prescription: former water gets into from membrane module bottom, washes away membranous wall in film silk inboard, the inboard pollutent of film silk is just being washed drain by membrane module discharging.
The above only is a preferred implementation of the present invention; Be noted that for those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.

Claims (9)

1. appliance for treating drinking water based on ultra-filtration equipment; It is characterized in that: this device comprises one-level lift pump, coagulative precipitation tank (1), ultra-filtration equipment (3) and clean water basin (4); The water outlet of said one-level lift pump connects the water-in of coagulative precipitation tank (1); The water outlet of coagulative precipitation tank (1) connects the water-in of ultra-filtration equipment (3) through ultrafiltration water pump (5), and the water outlet of ultra-filtration equipment (3) connects clean water basin (4).
2. the appliance for treating drinking water based on ultra-filtration equipment according to claim 1 is characterized in that: this device also comprises absorption reaction pond (2), and said absorption reaction pond (2) is connected between coagulative precipitation tank (1) and the ultra-filtration equipment (3).
3. the appliance for treating drinking water based on ultra-filtration equipment according to claim 2 is characterized in that: this device also comprises the Powdered Activated Carbon throwing device that adds Powdered Activated Carbon to absorption reaction pond (2), and in absorption reaction pond (2), also is provided with whipping appts.
4. the appliance for treating drinking water based on ultra-filtration equipment according to claim 3; It is characterized in that: this device comprises that also said gac dosage gear is connected with the Powdered Activated Carbon throwing device according to the gac dosage gear of water quality and water yield control gac dosage.
5. the appliance for treating drinking water based on ultra-filtration equipment according to claim 1 is characterized in that: said ultra-filtration equipment (3) adopts external-compression type PVDF polysulfone hollow fiber ultrafiltration membrane system.
6. the appliance for treating drinking water based on ultra-filtration equipment according to claim 1; It is characterized in that: this device also comprises positive cleaning device and the backwash device that ultra-filtration equipment (3) is washed; Said backwash device comprises backwash water pump (6) and deep bed filter (7); The water-in of said backwash water pump (6) connects the backwash feed water inlet of clean water basin (4), and backwash water pump (6) connects the water outlet of ultra-filtration equipment (3) through deep bed filter (7), and the backwash water outlet is arranged on the inlet end of ultra-filtration equipment (3); What said positive cleaning device comprised the water outlet end that is arranged on ultra-filtration equipment (3) just washes out the mouth of a river.
7. the appliance for treating drinking water based on ultra-filtration equipment according to claim 7 is characterized in that: this device also comprises the PLC system control device, between the water-in of the water outlet of ultra-filtration equipment (3) and clean water basin (4), also is provided with magnetic flow meter; Between the water-in that advances ultrafiltration water pump (5) and ultra-filtration equipment (3), just wash out between the water-in of water outlet and clean water basin (4) of place, the mouth of a river, backwash water outlet place, ultra-filtration equipment (3), the water outlet and the deep bed filter (7) of ultra-filtration equipment (3) be respectively equipped with operated pneumatic valve; The data transmission terminal of said magnetic flow meter and all operated pneumatic valves is connected on the PLC system control device.
8. the appliance for treating drinking water based on ultra-filtration equipment according to claim 1 is characterized in that: all be provided with teletransmission tensimeter and tensimeter on the spot at the water outlet of the water-in of ultra-filtration equipment (3) and ultra-filtration equipment (3).
9. the appliance for treating drinking water based on ultra-filtration equipment according to claim 1 is characterized in that: be provided with remote control liquid flowmeter and under meter on the spot at the water outlet of ultra-filtration equipment (3).
CN201110257418A 2011-09-02 2011-09-02 Drinking water treatment device based on ultrafiltration device Pending CN102329022A (en)

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CN103833108A (en) * 2014-03-18 2014-06-04 北京林业大学 Novel domestic ultra-filtration water purifier for removing arsenium (fluorine)
CN105906086A (en) * 2016-06-12 2016-08-31 深圳市水务(集团)有限公司 Short-flow drinking water deep processing system and technology

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Publication number Priority date Publication date Assignee Title
CN102583651A (en) * 2012-03-06 2012-07-18 北京科泰兴达高新技术有限公司 Water-saving ultra/microfiltration purification device for water
CN103833108A (en) * 2014-03-18 2014-06-04 北京林业大学 Novel domestic ultra-filtration water purifier for removing arsenium (fluorine)
CN105906086A (en) * 2016-06-12 2016-08-31 深圳市水务(集团)有限公司 Short-flow drinking water deep processing system and technology

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Application publication date: 20120125