CN103896417A - Dialysis water device and manufacturing method thereof - Google Patents
Dialysis water device and manufacturing method thereof Download PDFInfo
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- CN103896417A CN103896417A CN201210590182.3A CN201210590182A CN103896417A CN 103896417 A CN103896417 A CN 103896417A CN 201210590182 A CN201210590182 A CN 201210590182A CN 103896417 A CN103896417 A CN 103896417A
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Abstract
The invention belongs to the technical field of medical apparatuses and instruments, and particularly relates to a dialysis water device and a manufacturing method thereof. The dialysis water device disclosed by the invention comprises a reverse osmosis assembly, a hemodialysis machine, a particulate filter and a frequency conversion type booster pump, wherein the reverse osmosis assembly is used for purifying source water; the particulate filter is used for filtering particulates and bacteria in purified water, and conveying the purified water to the hemodialysis machine for performing dialysis treatment; the purified water filtered by the particulate filter after being purified by the reverse osmosis assembly and the hemodialysis machine form a closed loop type circulation; the frequency conversion type booster pump is used for providing a pressure to drive the reverse osmosis assembly for purifying the source water, and controlling the rotating speed of a source water booster pump in real time according to the pressure change of the purified water so as to ensure the demand of water quantity of the hemodialysis machine. According to the dialysis water device and the manufacturing method thereof disclosed by the embodiment of the invention, due to no need of storage, the secondary pollution is prevented, and the hemodialysis quality and safety are improved.
Description
Technical field
The invention belongs to technical field of medical instruments, relate in particular to a kind of water for dialysis device and manufacture method thereof.
Background technology
At present, the kidney water for dialysis device point single-stage (using one group of reverse osmosis membrane) using clinically and twin-stage purifying (two groups of reverse osmosis membranes before and after using) inject in pure water hold-up vessel and store by micro-filtration, then with pipeline, the hemo system at dialysis center and a vacuum primingpump are formed to a closed loop circulation by pure water hold-up vessel, purified water is transported to every haemodialysis control unit and carries out hemodialysis, specifically referring to Fig. 1, is the effect schematic diagram of existing water for dialysis device periodical feeding pattern.In order to guarantee the water demand of haemodialysis control unit, the purified water that starts to finish in pure water hold-up vessel to treatment from therapeutic process always remains on certain liquid level, so, and the situation that can cause the water of manufacturing on the same day also recycling for second day; Owing in pure water hold-up vessel being open non-tight structure, purified water, with easily growth bacterium of air contact, causes the potential safety hazard of hemodialysis.
Summary of the invention
The invention provides a kind of water for dialysis device and manufacture method thereof, be intended to solve existing water for dialysis device because purified water recycles the technical problem that has treatment potential safety hazard.
Technical scheme provided by the invention is: a kind of water for dialysis device, comprise anti-seepage membrane assembly, haemodialysis control unit, particulate filter and frequency conversion type topping-up pump, described anti-seepage membrane assembly is for carrying out purification process to source water, described particulate filter is for particulate and the bacterium of filtering purified water, and purified water is transported to haemodialysis control unit carries out dialysis treatment; The circulation of the purified water of filtering through particulate filter again after described anti-seepage membrane assembly purifying and haemodialysis control unit composition closed loop; Described frequency conversion type topping-up pump is used for providing pressure-driven anti-seepage membrane assembly to carry out purification process to source water, and controls in real time the rotating speed of source water topping-up pump according to the pressure change of purified water, guarantees the water demand of haemodialysis control unit.
Technical scheme of the present invention also comprises: also comprise pressure-detecting device and frequency conversion type topping-up pump, described pressure-detecting device is arranged on the end of closed loop circulation, for detecting the pressure change of purified water in purified water working cycle, and the pressure change of purified water is fed back to frequency conversion type topping-up pump; Described frequency conversion type topping-up pump is used for providing pressure-driven anti-seepage membrane assembly to carry out purification process to source water, and controls in real time the rotating speed of source water topping-up pump according to the pressure change of purified water, guarantees the water demand of haemodialysis control unit.
Technical scheme of the present invention also comprises: also comprises,
Source water topping-up pump: for source water being flowed out the source water extraction in topping-up pump for pressure according to water consumption;
Sand-bed filter: for the dirty foreign material of the source water flowing out are carried out to filtration treatment;
Carbon filter: adsorb for the small organic molecule pollutant to source water;
Softening agent: for the hardness component of source water is removed;
Cartridge filter: for removing the above fine particles of source water turbidity 1 degree.
Technical scheme of the present invention also comprises: the principle of work of described water for dialysis device is: set a fixing force value by pressure-detecting device, in the time newly increasing or reduce one or more haemodialysis control unit, the pressure of the purified water in circulation can corresponding minimizing or increase, by pressure-detecting device, the change information of purified water pressure is fed back to frequency conversion type topping-up pump, the rotating speed that frequency conversion type topping-up pump is controlled source water topping-up pump in real time according to the pressure change of purified water reduces or raises, and guarantees the water demand of haemodialysis control unit.
Technical scheme of the present invention also comprises: when described circulatory purification water toos many or too much for use, directly defeated getting back to after purified before anti-seepage membrane assembly and micro-filtration is processed flows in the purified water of circulation again.
Another technical scheme provided by the invention, a kind of water for dialysis manufacture method, comprising:
Step a: source water is carried out to purification process by frequency conversion type topping-up pump pressure-driven anti-seepage membrane assembly;
Step b: the particulate in filtering purified water and bacterium;
Step c: the purified water after purifying and micro-filtration is transported to haemodialysis control unit and carries out dialysis treatment.
Technical scheme of the present invention also comprises: before described step a, also comprise: provide pressure that source water is flowed out by topping-up pump, by sand-bed filter, the dirty foreign material in the source water flowing out are carried out to filtration treatment, by carbon filter, the small organic molecule pollutant in the water of source is adsorbed, by softening agent, the calcium in the water of source, magnesium ion hardness component are removed, and removed the above fine particles of turbidity 1 degree in the water of source by cartridge filter.
Technical scheme of the present invention also comprises: described step a also comprises: by frequency conversion type topping-up pump pressure-driven anti-seepage membrane assembly, source water is carried out to purification process; Described step b also comprises: by particulate and bacterium in particulate filter filtering purified water, and the purified water of filtering through particulate filter again through anti-seepage membrane assembly purifying and the circulation of haemodialysis control unit composition closed loop.
Technical scheme of the present invention also comprises: after described step c, comprise: in purified water working cycle, detect the pressure change of purified water by pressure-detecting device, and the pressure change of purified water is fed back to frequency conversion type topping-up pump; The rotating speed that described frequency conversion type topping-up pump is controlled source water topping-up pump in real time according to the pressure change of purified water reduces or raises, and guarantees the water demand of haemodialysis control unit; Described pressure-detecting device is arranged on the end of described closed loop circulation.
Technical scheme of the present invention also comprises: after described step c, comprise: defeated exhaustless recirculated water getting back to after purified before anti-seepage membrane assembly and micro-filtration is processed re-entered in the purified water of circulation.
Technical scheme tool of the present invention has the following advantages or beneficial effect: the water for dialysis device of the embodiment of the present invention and manufacture method thereof are by the circulation of the haemodialysis control unit composition closed loop at the purified water of filtering through particulate filter again after anti-seepage membrane assembly purifying is direct and the center of dialysis, without storage; Avoid causing secondary pollution; And the end setting pressure proofing unit circulating, detect in real time the change information of purified water pressure by pressure-detecting device, control in real time the rotating speed of source water topping-up pump according to the pressure change of purified water, guarantee water for dialysis device constant pressure water supply, guarantee the water demand of haemodialysis control unit; Meanwhile, the exhaustless directly defeated purified water of getting back to before anti-seepage membrane assembly more purified and micro-filtration and again flow into after processing circulation of recirculated water
In, improve hemodialysis quality and security.
Accompanying drawing explanation
Accompanying drawing 1 is the effect schematic diagram of existing water for dialysis device periodical feeding pattern;
Accompanying drawing 2 is structural representations of the water for dialysis device of the embodiment of the present invention;
Accompanying drawing 3 is effect schematic diagram of the water for dialysis device periodical feeding pattern of the embodiment of the present invention;
Accompanying drawing 4 is schemas of the water for dialysis manufacture method of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 2, is the structural representation of the water for dialysis device of the embodiment of the present invention.The water for dialysis device of the embodiment of the present invention comprises source water topping-up pump, sand-bed filter, carbon filter, softening agent, cartridge filter, frequency conversion type topping-up pump, anti-seepage membrane assembly, particulate filter, haemodialysis control unit and pressure-detecting device, particularly,
Source water topping-up pump is for flowing out source water to the source water extraction in topping-up pump for pressure according to water consumption;
Sand-bed filter is for carrying out filtration treatment to the dirty foreign material of the source water flowing out; Sand-bed filter (sand filter), formal name used at school is shallow media filter, is that one utilizes filtration medium to remove each middle suspended substance, microorganism and other subparticles in water, finally reaches a kind of High-cfficiency Filtration equipment that reduces water turbidity, the effect that purifies water.
Carbon filter adsorbs for pollutants such as the small organic molecules to source water, carbon filter is charcoal filter, is the pressurized vessel of a kind of interior filling rubble English sand bedding course and high grade activated carbon, in water quality pretreatment system, carbon filter can adsorb the chlorine residue that cannot remove in prime filtration and be subject to its oxidative degradation to prevent rear class reverse osmosis membrane, also adsorb from prime simultaneously and leak the pollutants such as the small organic molecule of coming, to peculiar smell in water, colloid and pigment and heavy metal ion etc. have obvious Adsorption effect, also there is the COD(Chemical of reduction Oxygen Demand, chemical oxygen demand (COD)) effect, can further reduce RO(Reverse Osmosis membrane, reverse osmosis) water inlet SDI(Silting Density Index, Silt density index) value, guarantee SDI<5, TOC<2.Oppm.
Softening agent is Na-ion exchanger, by container, resin, valve or demodulator and the composition of the control system of splendid attire resin, for adopting cationic exchange technology that the hardness component of source water (calcium, magnesium ion) is removed.
Cartridge filter is accurate filter, for removing the above fine particles of source water turbidity 1 degree, meets the requirement of subsequent handling to water inlet; Operated by rotary motion, before pressurized vessel, is also arranged on the end of whole water treatment system sometimes, for preventing that fine particles (as broken resin) from entering finished product water.
Frequency conversion type topping-up pump is used for providing pressure-driven anti-seepage membrane assembly to carry out purification process to source water, and regulates the rotating speed of source water topping-up pump according to the variation of purified water flow, makes water for dialysis device constant pressure water supply; Wherein, the embodiment of the present invention changes the common topping-up pump before anti-seepage membrane assembly into frequency conversion type topping-up pump, directly circulates with haemodialysis control unit composition closed loop through anti-seepage membrane assembly and particulate filter purified water after treatment, without storage, avoids causing secondary pollution; And at the end setting pressure proofing unit circulating, for detection of the pressure change of circulatory purification water, regulate in real time the rotating speed of source water topping-up pump to realize constant pressure water supply by the variation of purified water pressure.
Anti-seepage membrane assembly for carrying out purification process to source water under the pressure-driven of frequency conversion type topping-up pump; Wherein, anti-seepage membrane is the most accurate embrane method liquid separation technology, the functional semi-permeable membranes of one that allows solvent molecule to see through and not allow solute molecule to see through, it can stop the organism that nearly all solvability salt and molecular weight are greater than 200, but allows water and part salinity to see through.
Particulate filter is for particulate and the bacterium of filtering purified water, and purified water is transported to haemodialysis control unit carries out dialysis treatment; Wherein, particulate filter is the general designation of the membrane filtration commercial affairs of aperture 0.2-1um, it is the Novel filtering device of just developing in recent years both at home and abroad, can filtering liquid, more than the 0.1um of gas particulate and bacterium, particulate filter has that filtering accuracy is high, transition speed fast, absorption less, without medium come off, acid-alkali-corrosive-resisting, the advantage such as easy to operate.
Pressure-detecting device is for detecting the pressure change of purified water in purified water working cycle, and the pressure change of purified water is fed back to frequency conversion type topping-up pump, the rotating speed that frequency conversion type topping-up pump is controlled source water topping-up pump in real time according to the pressure change of purified water reduces or raises, keep the constant pressure of circulation waterway by the variation of purified water flow, guarantee the water demand of haemodialysis control unit; Wherein, in the time newly increasing or reduce one or more haemodialysis control unit, the pressure of the purified water in circulation can corresponding minimizing or increase, regulates in real time the rotating speed of source water topping-up pump to realize constant pressure water supply by the variation of purified water pressure.
The principle of work of the water for dialysis device of the embodiment of the present invention is: use the conventional pressurized pump before anti-seepage membrane assembly instead frequency conversion type force (forcing) pump, the purified water of filtering through particulate filter again after anti-seepage membrane assembly purifying directly forms the circulation of closed loop with the haemodialysis control unit at dialysis center, without storage, avoid causing secondary pollution; And the end setting pressure proofing unit circulating, in the time for the treatment of, set a fixing force value, in the time newly increasing or reduce one or more haemodialysis control unit, the pressure of the purified water in circulation can corresponding minimizing or increase, by pressure-detecting device, the change information of purified water pressure is fed back to frequency conversion type topping-up pump, the rotating speed that frequency conversion type topping-up pump is controlled source water topping-up pump in real time according to the pressure change of purified water reduces or raises, guarantee water for dialysis device constant pressure water supply, guarantee the water demand of haemodialysis control unit; Meanwhile, the exhaustless directly defeated purified and micro-filtration again of getting back to before anti-seepage membrane assembly of recirculated water flows in the purified water of circulation after processing again, improves hemodialysis quality and security; Specifically seeing also Fig. 3, is the effect schematic diagram of the water for dialysis device periodical feeding pattern of the embodiment of the present invention.In embodiments of the present invention, the fixation pressure value of setting is 2KG/CM2, specifically can set according to practical situation.
Referring to Fig. 4, is the schema of the water for dialysis manufacture method of the embodiment of the present invention.The water for dialysis manufacture method of the embodiment of the present invention comprises the following steps:
Step 200: provide pressure that source water is flowed out by topping-up pump;
Step 210: the dirty foreign material in the source water flowing out are carried out to filtration treatment by sand-bed filter;
In step 210, sand-bed filter (sand filter), formal name used at school is shallow media filter, is that one utilizes filtration medium to remove each middle suspended substance, microorganism and other subparticles in water, finally reaches a kind of High-cfficiency Filtration equipment that reduces water turbidity, the effect that purifies water.
Step 220: the pollutants such as the small organic molecule in the water of source are adsorbed by carbon filter;
In step 220, carbon filter is charcoal filter, is the pressurized vessel of a kind of interior filling rubble English sand bedding course and high grade activated carbon, in water quality pretreatment system, carbon filter can adsorb the chlorine residue that cannot remove in prime filtration and be subject to its oxidative degradation to prevent rear class reverse osmosis membrane, also adsorb from prime simultaneously and leak the pollutants such as the small organic molecule of coming, to peculiar smell in water, colloid and pigment and heavy metal ion etc. have obvious Adsorption effect, also there is the COD(Chemical of reduction Oxygen Demand, chemical oxygen demand (COD)) effect, can further reduce RO(Reverse Osmosis membrane, reverse osmosis) water inlet SDI(Silting Density Index, Silt density index) value, guarantee SDI<5, TOC<2.Oppm.
Step 230: the hardness such as calcium, the magnesium ion component in the water of source is removed by softening agent;
In step 230, softening agent is Na-ion exchanger, by container, resin, valve or demodulator and the composition of the control system of splendid attire resin, for adopting cationic exchange technology that the hardness such as calcium, the magnesium ion component of source water is removed.
Step 240: remove the above fine particles of turbidity 1 degree in the water of source by cartridge filter;
In step 240, cartridge filter is accurate filter, and operated by rotary motion, before pressurized vessel, is also arranged on the end of whole water treatment system sometimes, be used for preventing that fine particles (as broken resin) from entering finished product water, meet the requirement of subsequent handling to water inlet.
Step 250: source water is carried out to purification process by frequency conversion type topping-up pump pressure-driven anti-seepage membrane assembly;
In step 250, the embodiment of the present invention changes the common topping-up pump before anti-seepage membrane assembly into frequency conversion type topping-up pump, directly circulate with haemodialysis control unit composition closed loop through anti-seepage membrane assembly and particulate filter purified water after treatment, without storage, avoid causing secondary pollution; And at the end setting pressure proofing unit circulating, for detection of the pressure change of circulatory purification water, regulate in real time the rotating speed of source water topping-up pump to realize constant pressure water supply by the variation of purified water pressure; Anti-seepage membrane is the most accurate embrane method liquid separation technology, the functional semi-permeable membranes of one that allows solvent molecule to see through and not allow solute molecule to see through, it can stop the organism that nearly all solvability salt and molecular weight are greater than 200, but allows water and part salinity to see through.
Step 260: by particulate and bacterium in particulate filter filtering purified water, and purified water is transported to haemodialysis control unit carries out dialysis treatment;
In step 260, particulate filter is the general designation of the membrane filtration commercial affairs of aperture 0.2-1um, it is the Novel filtering device of just developing in recent years both at home and abroad, can filtering liquid, more than the 0.1um of gas particulate and bacterium, particulate filter has that filtering accuracy is high, transition speed fast, absorption less, without medium come off, acid-alkali-corrosive-resisting, the advantage such as easy to operate.
Step 270: detect the pressure change of purified water by pressure-detecting device in purified water working cycle, and the pressure change of purified water is fed back to frequency conversion type topping-up pump;
In step 270, in the time for the treatment of, set a fixing force value, in the time newly increasing or reduce one or more haemodialysis control unit, the pressure of the purified water in circulation can corresponding minimizing or increase, detect in real time the pressure change of purified water by pressure-detecting device, and change information is fed back to frequency conversion type topping-up pump, the rotating speed that frequency conversion type topping-up pump is controlled source water topping-up pump in real time according to the pressure change of purified water reduces or raises, guarantee water for dialysis device constant pressure water supply, guarantee the water demand of haemodialysis control unit; In embodiments of the present invention, the fixation pressure value of setting is 2KG/CM2, specifically can set according to practical situation.
Step 280: the rotating speed of controlling in real time source water topping-up pump according to the pressure change of purified water reduces or raises, and guarantees water for dialysis device constant pressure water supply, guarantees the water demand of haemodialysis control unit;
Step 290: defeated exhaustless the recirculated water purified and micro-filtration again of getting back to before anti-seepage membrane assembly is re-entered in the purified water of circulation after processing.
In step 290, the present invention, by again processing before getting back to anti-seepage membrane assembly directly defeated exhaustless recirculated water, avoids causing secondary pollution, improves hemodialysis quality and security.
The water for dialysis device of the embodiment of the present invention and manufacture method thereof, by by the circulation of the haemodialysis control unit composition closed loop the at direct purified water of filtering through particulate filter again after anti-seepage membrane assembly purifying and dialysis center, without storage, avoid causing secondary pollution; And the end setting pressure proofing unit circulating, detect in real time the change information of purified water pressure by pressure-detecting device, control in real time the rotating speed of source water topping-up pump according to the pressure change of purified water, guarantee water for dialysis device constant pressure water supply, guarantee the water demand of haemodialysis control unit; Meanwhile, the exhaustless directly defeated purified and micro-filtration again of getting back to before anti-seepage membrane assembly of recirculated water flows in the purified water of circulation after processing again, improves hemodialysis quality and security.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a water for dialysis device, comprise anti-seepage membrane assembly and haemodialysis control unit, described anti-seepage membrane assembly is for carrying out purification process to source water, it is characterized in that, also comprise particulate filter and frequency conversion type topping-up pump, described particulate filter is for particulate and the bacterium of filtering purified water, and purified water is transported to haemodialysis control unit carries out dialysis treatment, and the purified water of filtering through particulate filter again after described anti-seepage membrane assembly purifying and haemodialysis control unit form the circulation of closed loop; Described frequency conversion type topping-up pump is used for providing pressure-driven anti-seepage membrane assembly to carry out purification process to source water, and controls in real time the rotating speed of source water topping-up pump according to the pressure change of purified water, guarantees the water demand of haemodialysis control unit.
2. water for dialysis device according to claim 1, it is characterized in that, also comprise pressure-detecting device, described pressure-detecting device is arranged on the end of closed loop circulation, for detecting the pressure change of purified water in purified water working cycle, and the pressure change of purified water is fed back to frequency conversion type topping-up pump.
3. water for dialysis device according to claim 1 and 2, is characterized in that, also comprise,
Source water topping-up pump: for source water being flowed out the source water extraction in topping-up pump for pressure according to water consumption;
Sand-bed filter: for the dirty foreign material of the source water flowing out are carried out to filtration treatment;
Carbon filter: adsorb for the small organic molecule pollutant to source water;
Softening agent: for the hardness component of source water is removed;
Cartridge filter: for removing the above fine particles of source water turbidity 1 degree.
4. water for dialysis device according to claim 3, it is characterized in that, the principle of work of described water for dialysis device is: set a fixing force value by pressure-detecting device, in the time newly increasing or reduce one or more haemodialysis control unit, the pressure of the purified water in circulation can corresponding minimizing or increase, by pressure-detecting device, the change information of purified water pressure is fed back to frequency conversion type topping-up pump, the rotating speed that frequency conversion type topping-up pump is controlled source water topping-up pump in real time according to the pressure change of purified water reduces or raises, and guarantees the water demand of haemodialysis control unit.
5. water for dialysis device according to claim 4, is characterized in that, when described circulatory purification water toos many or too much for use, directly defeated getting back to after purified before anti-seepage membrane assembly and micro-filtration is processed flows in the purified water of circulation again.
6. a water for dialysis manufacture method, comprising:
Step a: source water is carried out to purification process by frequency conversion type topping-up pump pressure-driven anti-seepage membrane assembly;
Step b: the particulate in filtering purified water and bacterium;
Step c: the purified water after purifying and micro-filtration is transported to haemodialysis control unit and carries out dialysis treatment.
7. water for dialysis manufacture method according to claim 6, it is characterized in that, before described step a, also comprise: provide pressure that source water is flowed out by topping-up pump, by sand-bed filter, the dirty foreign material in the source water flowing out are carried out to filtration treatment, by carbon filter, the small organic molecule pollutant in the water of source is adsorbed, by softening agent, the calcium in the water of source, magnesium ion hardness component are removed, and removed the above fine particles of turbidity 1 degree in the water of source by cartridge filter.
8. according to the water for dialysis manufacture method described in claim 6 or 7, it is characterized in that, described step b also comprises: by particulate and bacterium in particulate filter filtering purified water, and the purified water of filtering through particulate filter again through anti-seepage membrane assembly purifying and the circulation of haemodialysis control unit composition closed loop.
9. water for dialysis manufacture method according to claim 8, it is characterized in that, after described step c, comprise: in purified water working cycle, detect the pressure change of purified water by pressure-detecting device, and the pressure change of purified water is fed back to frequency conversion type topping-up pump; The rotating speed that described frequency conversion type topping-up pump is controlled source water topping-up pump in real time according to the pressure change of purified water reduces or raises, and guarantees the water demand of haemodialysis control unit; Described pressure-detecting device is arranged on the end of described closed loop circulation.
10. water for dialysis manufacture method according to claim 8, is characterized in that, after described step c, comprises: defeated exhaustless recirculated water getting back to after purified before anti-seepage membrane assembly and micro-filtration is processed re-entered in the purified water of circulation.
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| CN104594442A (en) * | 2015-01-07 | 2015-05-06 | 成都邦研科技有限公司 | Constant pressure water supply device of water preparing equipment for hemodialysis |
| CN105502778A (en) * | 2015-11-27 | 2016-04-20 | 浙江水利水电学院 | Hemodialysis water treatment equipment based on heat sterilization and multi-process selection |
| CN106641723A (en) * | 2016-11-17 | 2017-05-10 | 黄书泉 | Remotely and wirelessly controlled greater-circulation mass-flow high-flow-velocity dynamic water supply system |
| CN110304772A (en) * | 2019-07-31 | 2019-10-08 | 南通市第一人民医院 | A kind of circulation sterilizing water for dialysis processing unit of automatic replacement components |
| CN110841125A (en) * | 2019-11-05 | 2020-02-28 | 武汉市中医医院 | Peritoneal dialysis solution supply system |
| CN110877932A (en) * | 2019-12-24 | 2020-03-13 | 杭州之江水处理设备有限公司 | Two-stage five-membrane hemodialysis water production equipment and water production process |
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Application publication date: 20140702 |