CN113788556A - Intelligent self-cleaning system and cleaning process for commercial water purifier - Google Patents
Intelligent self-cleaning system and cleaning process for commercial water purifier Download PDFInfo
- Publication number
- CN113788556A CN113788556A CN202111186148.5A CN202111186148A CN113788556A CN 113788556 A CN113788556 A CN 113788556A CN 202111186148 A CN202111186148 A CN 202111186148A CN 113788556 A CN113788556 A CN 113788556A
- Authority
- CN
- China
- Prior art keywords
- water
- washing
- acid
- membrane
- cleaning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 153
- 238000004140 cleaning Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000008569 process Effects 0.000 title claims abstract description 15
- 239000012528 membrane Substances 0.000 claims description 146
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 75
- 238000005406 washing Methods 0.000 claims description 50
- 238000011001 backwashing Methods 0.000 claims description 48
- 238000000108 ultra-filtration Methods 0.000 claims description 44
- 239000002253 acid Substances 0.000 claims description 41
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 40
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- 150000003839 salts Chemical class 0.000 claims description 38
- 238000000909 electrodialysis Methods 0.000 claims description 37
- 238000001223 reverse osmosis Methods 0.000 claims description 37
- 229920000742 Cotton Polymers 0.000 claims description 32
- 239000003513 alkali Substances 0.000 claims description 28
- 229910052799 carbon Inorganic materials 0.000 claims description 25
- 239000002585 base Substances 0.000 claims description 22
- 239000011780 sodium chloride Substances 0.000 claims description 20
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- 230000008929 regeneration Effects 0.000 claims description 13
- 238000011069 regeneration method Methods 0.000 claims description 13
- 239000002351 wastewater Substances 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000006386 neutralization reaction Methods 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims 2
- 239000000243 solution Substances 0.000 claims 2
- 239000012267 brine Substances 0.000 claims 1
- 238000011010 flushing procedure Methods 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000002245 particle Substances 0.000 description 20
- 235000013162 Cocos nucifera Nutrition 0.000 description 7
- 244000060011 Cocos nucifera Species 0.000 description 7
- 239000008399 tap water Substances 0.000 description 6
- 235000020679 tap water Nutrition 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 150000001768 cations Chemical class 0.000 description 4
- 235000020188 drinking water Nutrition 0.000 description 4
- 239000003651 drinking water Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 150000001450 anions Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 150000001720 carbohydrates Chemical class 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012510 hollow fiber Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
-
- 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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- 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
-
- 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
- C02F2303/16—Regeneration of sorbents, filters
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention relates to an intelligent self-cleaning system and method for a commercial water purifier. The invention mainly comprises a set of complete cleaning system, the effluent index at the rear end of each step of treatment process is monitored on line in real time through a control system, and if the effluent index at the rear end of one step of treatment process exceeds a set value, the control system can automatically clean the polluted unit. Through the control of the intelligent online self-cleaning system, high-efficiency cleaning can be realized, the frequency of replacing the filter element of the commercial water purifier is greatly reduced, and the economic burden of a user is reduced. The invention provides an effective solution for self-cleaning of the commercial water purifier from the aspects of on-line monitoring, intelligent self-cleaning systems and the like.
Description
Technical Field
The invention belongs to the technical field of self-cleaning of commercial water purifiers, and particularly relates to an intelligent self-cleaning system and a cleaning method for a commercial water purifier.
Background
Water is the source of life, and along with the improvement gradually of people's standard of living, safe and healthy drinking water concept is constantly strengthened, and the demand of water purifier is more and more, and the water purifier is also called purifier, water quality purifier, and its core processing technology is the filter. Divide into milipore filter and reverse osmosis membrane according to the difference of membrane structure, commercial water purifier mainly adopts reverse osmosis membrane, and reverse osmosis membrane is the core element who realizes the water purifier, is the artificial semipermeable membrane that has certain characteristic that a simulation biological semipermeable membrane made. Generally made of high molecular materials. Such as cellulose acetate films, aromatic polyhydrazide films, aromatic polyamide films. The diameter of the surface micropores is generally between 0.5 and 10nm, and the size of the permeability is related to the chemical structure of the membrane itself. The chemical structure of the high polymer material has more hydrophilic groups, theoretically, only water molecules are allowed to pass through, and the water contains various organic matters/pollutants (such as high polymer protein, saccharides, colloidal suspended matters, calcium ions, magnesium ions and other impurity ions) which easily cause pollution of the water purifier.
From 2006 to 2020, the yield of the water purifiers in China is increased from 1056 ten thousand to 4500 ten thousand, and the yield of the water purifiers in 2021 year is expected to be close to 1.5 hundred million. With the popularization of water purifiers, a large amount of PP cotton filter elements, activated carbon filter elements, ultrafiltration membranes and RO reverse osmosis filter elements required by water treatment are consumed every year. Because these filter cores are not cleaned in time, the filter cores are blocked, the filter cores are directly replaced, a large amount of filter cores are wasted, the cost of a user is increased, and meanwhile, a large amount of replaced filter cores cause new pollution. If in time carry out effectual washing to cotton filter core of PP, active carbon filter core, milipore filter, RO reverse osmosis filter core in the use, more enough effectual reduction water purifier filter core replacement frequency improves the availability factor, reduces use cost, pollution abatement.
To sum up, in view of the problem that commercial water purifier filter core pollutes and changes, in time effectively wash whole commercial water purifier filter core, guarantee that water purifier filter core continuous, high-efficient, steady operation reduce the filter core and pollute, reduce filter core replacement frequency, reduce user's use cost's key problem.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an intelligent self-cleaning system and a cleaning method for a commercial water purifier, which can realize the comprehensive cleaning of the whole system.
The technical scheme for realizing the invention is as follows: the intelligent self-cleaning system for the commercial water purifier mainly comprises a backwashing system and a bipolar membrane acid-base regeneration system. After being filtered by the PP cotton filter element, the preposed active carbon filter element, the ultrafiltration membrane, the RO reverse osmosis and the postposition active carbon filter element, the water can effectively intercept various organic matters/pollutants (such as macromolecular protein, saccharides, colloidal suspended matters, calcium and magnesium ions and other impurity ions and the like) in the water. The control system can monitor the inlet and outlet pressure difference, TDS and inlet and outlet flow of the PP cotton filter element, the front activated carbon filter element, the ultrafiltration membrane, RO reverse osmosis, the rear activated carbon filter element in real time on line, and after receiving the signals, the control system adjusts the inlet and outlet parameters of each processing unit according to a set program. When the pressure difference or the TDS value of the inlet and the outlet of one filtering unit is higher than a set value, the control system discharges water in the system to washing neutralizing water, and the control system starts to clean the blocking unit at a fixed point, so that the stable operation of the whole system is ensured.
The control system can detect online monitoring PP cotton filter element, preposed active carbon filter element, ultrafiltration membrane, RO reverse osmosis, postposition active carbon filter element inlet-outlet pressure difference, TDS and inlet-outlet flow.
The control system can control the backwashing unit to clean the polluted unit, and control the cleaning flow and the cleaning time. The water used for backwashing is pure water prepared by a commercial water purifier, the backwashing flow is 20-40L/min, and the backwashing water is collected by a pipeline and can be used as daily other water. The backwashing system can be used for washing the filtering unit after acid washing and alkali washing, the washing flow is 20-40L/min, an online detection pH meter is arranged in the backwashing system, when the pH value of backwashing water is less than 7.5, the washing is finished, and the equipment is switched to a normal water production mode.
The control system can control the bipolar membrane electrodialysis system to prepare the NaCl solution into hydrochloric acid and sodium hydroxide to carry out acid washing and alkali washing on the polluted unit, and control the washing flow and time.
The working pressure of the PP cotton filter element is generally 0.1-0.2 MPa, the TDS of the effluent is 300 mg/L, the pore diameter is 0.2-0.45 mu m, the flow rate is 1-20L/min, and the working temperature is preferably 25-50 ℃.
The working pressure of the active carbon filter element is generally 0.1-0.3MPa, the TDS of the effluent is 100-200 mg/L, the flow rate is 1-20L/min, and the active carbon is prepared from coconut shells. Particle size of activated carbon: the smaller the particle size, the higher the adsorption speed, but the smaller the particle size, the larger the head loss of the activated carbon filter element when passing water, and the easy blockage. In general, the average particle diameter is preferably 1.5 to 1.7mm, and the effective particle diameter is preferably 0.8 to 0.9 mm.
The ultrafiltration membrane controls the ratio of produced water to return water to be 1-3, the pressure difference between the front membrane and the rear membrane of the ultrafiltration system is monitored, the pressure difference is controlled within 0.2 MPa, the TDS of the effluent is 150 mg/L, and the flow is 1-20L/min. The ultrafiltration unit adopts a hollow fiber membrane, the wall thickness is 0.03 mu m, the inner diameter of the membrane wire is 0.3-0.6 mm, the outer diameter of the membrane wire is 0.5-1.2mm, the use temperature is 5-45 ℃, and the use pH range is 2-11.
When the pressure of the ultrafiltration membrane exceeds the normal working pressure by 0.2 MPa, the control system performs backwashing on the ultrafiltration system, the backwashing is to inject pure water into the ultrafiltration membrane through a high-power backwashing pump, and pollutants on the ultrafiltration membrane are washed away through large-flow pure water. After the backwashing is finished, if the pressure difference between the front and the back of the ultrafiltration membrane is still higher than 0.2 MPa, the control system can control the bipolar membrane electrodialysis system to prepare hydrochloric acid and sodium hydroxide from a NaCl solution to carry out acid washing and alkali washing on the ultrafiltration membrane, and the pH value range of the acid washing solution is 2-6; the alkaline cleaning solution is sodium hydroxide, the pH value of the alkaline cleaning solution is 9-11, and the alkaline cleaning solution is subjected to acid-base cleaning. And the backwashing pump cleans the ultrafiltration system until the pH value is less than 7.5, and the equipment is switched to a normal water production mode.
After the RO reverse osmosis is subjected to ultrafiltration treatment, suspended matters and macromolecular organic matters are intercepted, organic wastewater enters a reverse osmosis system, the ratio of concentrated water to fresh water is controlled to be about 1, the pressure difference of an inlet and an outlet of the RO reverse osmosis is monitored, the pressure difference is controlled to be within 0.1-0.3MPa, and the TDS of effluent is 50-100 mg/L. The hollow fiber membrane adopted by the reverse osmosis unit has the use temperature of 5-45 ℃ and the use pH range of 1-12.
The bipolar membrane electrodialysis system is composed of a group of membrane stacks, each membrane stack is composed of a positive membrane, a negative membrane and 10 pairs of bipolar membranes, and the three groups of membrane stacks are connected in series to form an acid chamber, an alkali chamber and a salt chamber.
The bipolar membrane electrodialysis process is based on the traditional electrodialysis, and adds a bipolar membrane in addition to the original negative membrane and positive membrane. Bipolar membranes are generally composed of three components, an anion selective layer (AEL), a cation selective layer (CEL), and an intermediate layer (catalytic layer). When the cathode and the anode of the electrodialysis membrane stack are electrified, the bipolar membrane can rapidly dissociate water into H+With OH-Ion, dissociated H+With OH-Ions are driven to move directionally by an electric field, and because the positive membrane in the bipolar membrane electrodialysis can only allow H+Through, the negative film can only let OH-By passage of H through the cation membrane+Combined with anions to form the corresponding acid, OH, passing through the cathode membrane-Combine with cations to form the corresponding base. The bipolar membrane electrodialysis system consists of a bipolar membrane electrodialysis membrane stack, a voltage-stabilized power supply, an acid chamber, an alkali chamber, a polar chamber and a salt chamber, and the whole bipolar membrane electrodialysis system works under a control system. A mass sensor is arranged in a salt chamber of the bipolar membrane electrodialysis system, the mass of added NaCl can be detected through weighing, then a control system controls certain pure water to enter the salt chamber, and high-concentration salt water with certain concentration is prepared (the conductivity of the salt chamber is kept at 180-year-round 300 ms/cm).
An ultrasonic instrument and a conductivity detector are arranged in a salt chamber of the bipolar membrane electrodialysis system, wherein the ultrasonic instrument can rapidly dissolve added NaCl in water through the ultrasonic action to form high-concentration salt water. The conductivity detector in the salt chamber can detect the conductivity of the salt chamber and ensure that the salinity of the salt chamber reaches the concentration for preparing acid and alkali, thereby ensuring the effects of acid washing and alkali washing.
Wherein the salt chamber is provided with an indicator light. The indicator light is connected with the mass sensor in the salt chamber, when the added NaCl is insufficient in quality, the indicator light is red, and when the added NaCl reaches the concentration for preparing acid and alkali, the indicator light is green, which indicates that the added NaCl is sufficient in quality, and the adding of NaCl is stopped. The bipolar membrane electrodialysis system can prepare a NaCl solution into hydrochloric acid and sodium hydroxide, and can perform acid washing and alkali washing on a PP cotton filter element, a preposed activated carbon filter element, an ultrafiltration membrane, RO reverse osmosis and a postposition activated carbon filter element.
Preferably, the water inlet pressure of the acid chamber, the alkali chamber and the salt chamber is 0.1-0.2 MPa, the outlet pressure is 0.1-0.2 MPa, the water inlet pressure of the polar water is 0.1-0.2 MPa, the water outlet pressure is 0.1-0.2 MPa, the water outlet flow of the acid chamber, the alkali chamber and the salt chamber is 1-20L/min, the water outlet flow of the polar water is 10-40L/min, a transformer in the membrane stack converts alternating current into direct current, and the operating voltage is 9-20V.
Preferably, the acid compartment has an initial acid concentration of 0.03-0.05mol/L HCl, the base compartment has an initial base concentration of 0.03-0.05mol/L NaOH, the salt compartment has 0.4-1 mol/L NaCl, and the ratio of the flow rates of acid, base and salt in the regeneration unit is 1:1: 1.
Preferably, the operation current of the bipolar membrane electrodialysis system is kept in a constant current state, and the current density on the membrane is 30-50 mA/cm2The pressure difference between the front and the back of the bipolar membrane electrodialysis membrane is kept within 0.2 MPa, and the conductivity of the salt chamber is kept at 180-300 ms/cm.
Based on the technical scheme, the invention has the beneficial effects that: on-line of the invention
And the control system can carry out targeted cleaning on the pollution blocking unit. The PP cotton filter element, the preposed activated carbon filter element, the ultrafiltration membrane, the RO reverse osmosis and the postposition activated carbon filter element can be cleaned through the backwashing system and the bipolar membrane system. According to the invention, acid-base cleaning is carried out on the polluted filtering unit by using acid-base cleaning liquid, so that pollutants remained on the filtering unit are effectively removed, the stable operation of all filtering units is ensured, the used NaCl is a common article in life, the obtaining cost is low, and the cleaning effect is good. Through the back washing and the cleaning of the bipolar membrane system, the service lives of the PP cotton filter element, the preposed activated carbon filter element, the ultrafiltration membrane, the RO reverse osmosis and the postposition activated carbon filter element are prolonged, the use cost is reduced, the number of abandoned filter elements is reduced, and the environment is effectively protected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow diagram of an intelligent self-cleaning process for a commercial water purifier;
figure 2 bipolar membrane electrodialysis system acid and base concentrations varied.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the following examples are illustrative only and are not intended to limit the scope of the invention, which is to be given numerous insubstantial modifications and adaptations by those skilled in the art based on the teachings set forth above.
Example 1
As shown in fig. 1, the intelligent self-cleaning system for the commercial water purifier comprises a control system 1, a back washing system 2 and a bipolar membrane acid-base regeneration system 3; pressure sensors are arranged at the inlet and outlet of a PP cotton filter element unit 4, a front activated carbon filter element unit 5, an ultrafiltration membrane unit 6, an RO reverse osmosis unit 7 and a rear activated carbon filter element unit 8 in the commercial water purifier, the pressure sensors are connected with a control system, and the control system can receive the pressure change of each unit in real time; the PP cotton filter element unit, the front active carbon filter element unit, the ultrafiltration membrane unit, the RO reverse osmosis unit and the rear active carbon filter element unit in the commercial water purifier are provided with flow meters, the flow meters are connected with a control system, and the control system can control the flow of each unit in real time; the inside of the commercial water purifier is provided with a bipolar membrane acid-base regeneration system and a backwashing system, and the bipolar membrane acid-base regeneration system and the backwashing system are connected with a control system; the bipolar membrane acid-base regeneration system adopts a bipolar membrane electrodialysis system.
The back washing system in the commercial water purifier can wash polluted units of the PP cotton filter element, the front activated carbon filter element, the ultrafiltration membrane, the RO reverse osmosis and the rear activated carbon filter element with large flow of water, the washed wastewater enters the collecting device through the washing neutralization pipeline, and all the wastewater in the washing process is gathered together through the collecting pipeline and can be used as daily other water.
The bipolar membrane electrodialysis system is composed of membrane piles, wherein the membrane piles are composed of positive membranes, negative membranes and 10 pairs of bipolar membranes, the three groups of membrane piles are connected in series to form an acid chamber, an alkali chamber and a salt chamber which form the bipolar membrane electrodialysis system, the membrane piles are close to the positive plates and the negative plates to form the electrode chambers, the bipolar membrane electrodialysis system further comprises a voltage-stabilized power supply, and the bipolar membrane electrodialysis system works under a control system.
The bipolar membrane acid-base regeneration system is based on the traditional bipolar membrane electrodialysis system, except for the original negative membrane and positive membrane, the bipolar membrane is added; the bipolar membrane is formed by compounding three parts, namely an anion selection layer (AEL), a cation selection layer (CEL) and an intermediate layer (catalytic layer).
The bipolar membrane electrodialysis system is composed of a membrane stack, the membrane stack is composed of a positive membrane, a negative membrane and 10 pairs of bipolar membranes, the three groups of membrane stacks are connected in series to form an acid chamber, an alkali chamber and a salt chamber, the anode plate and the cathode plate close to the membrane stack are the electrode chambers, and sodium sulfate solution is filled in the electrode chambers.
A mass sensor is arranged in a salt chamber of the bipolar membrane electrodialysis system, the mass of added NaCl can be detected through weighing, and then a control system controls certain pure water to enter the salt chamber to prepare high-concentration salt water with certain concentration. An ultrasonic instrument and a conductivity detector are arranged in a salt chamber of the bipolar membrane electrodialysis system, and an indicator light is arranged on the salt chamber and is connected with a quality sensor in the salt chamber.
Example 2
The intelligent self-cleaning process for the commercial water purifier of the embodiment is as follows:
tap water is firstly delivered to the PP cotton filter element through the flowmeter, the flow is controlled at 10L/min, and after being intercepted by the PP cotton filter element, large-particle impurities and suspended matters in the water can be removed. After being filtered by a PP cotton filter element, water enters a front activated carbon filter element, the flow is controlled at 10L/min, the activated carbon is prepared from coconut shells, the average particle size is preferably 1.5mm, and the effective particle size is 0.8 mm. After adsorption by the preposed active carbon, water enters an ultrafiltration unit, the flow is controlled at 10L/min, and the ratio of produced water to return water is controlled at 1 by the ultrafiltration membrane. After being filtered by the ultrafiltration membrane, water enters RO for reverse osmosis, the flow is controlled at 10L/min, and the ratio of produced water to waste water is controlled at 1 by the ultrafiltration membrane. After RO reverse osmosis filtration, the mixture enters post-positioned active carbon, the flow is controlled at 10L/min, the active carbon is prepared from coconut shells, the average particle size is preferably 1.5mm, and the effective particle size is preferably 0.8 mm. After being filtered by the post-positioned active carbon, tap water is deeply treated into direct drinking water which can be directly drunk. When the control system detects that the pressure difference of the inlet and the outlet of the PP cotton filter element is higher than a set value of 0.2 MPa, the water inlet of the PP cotton filter element is closed, the control system can control backwashing to clean the PP cotton filter element, and the cleaning flow rate is controlled to be 20L/min and the cleaning time is controlled to be 1 h. The water used for backwashing is pure water prepared by a commercial water purifier, and the backwashing water is collected by a pipeline and can be used as daily other water. And after the back washing is finished, monitoring whether the pressure difference of the inlet and the outlet of the PP cotton filter element is higher than 0.2 MPa on line. If the pressure difference of the inlet and the outlet of the PP cotton filter element is higher than 0.2 MPa, the control system can control the bipolar membrane electrodialysis system to prepare 1 mol/L hydrochloric acid and 1 mol/L sodium hydroxide from a NaCl solution to carry out acid washing and alkali washing on the PP cotton filter element, the pH value range of the acid washing solution is 3, and the acid washing is carried out for 1 hour; the alkaline cleaning solution is sodium hydroxide, the pH value range of the alkaline cleaning solution is 10, the alkaline cleaning is carried out for 1 hour, and the alkaline cleaning is carried out after the acid-base cleaning. And the backwashing pump cleans the PP cotton filter element by clean water until the pH value is less than 7.5, and then the equipment is switched to a normal water production mode.
Example 3
The intelligent self-cleaning process for the commercial water purifier of the embodiment is as follows:
tap water is firstly delivered to the PP cotton filter element through the flowmeter, the flow is controlled at 15L/min, and after being intercepted by the PP cotton filter element, large-particle impurities and suspended matters in the water can be removed. After being filtered by a PP cotton filter element, water enters a front activated carbon filter element, the flow is controlled at 15L/min, the activated carbon is prepared from coconut shells, the average particle size is preferably 1.5mm, and the effective particle size is 0.8 mm. After adsorption by the preposed active carbon, water enters an ultrafiltration unit, the flow is controlled at 15L/min, and the ratio of produced water to return water is controlled at 1 by the ultrafiltration membrane. After being filtered by the ultrafiltration membrane, water enters RO for reverse osmosis, the flow is controlled at 15L/min, and the ratio of produced water to waste water is controlled at 1 by the ultrafiltration membrane. After RO reverse osmosis filtration, the mixture enters post-positioned active carbon, the flow is controlled at 15L/min, the active carbon is prepared from coconut shells, the average particle size is preferably 1.5mm, and the effective particle size is preferably 0.8 mm. After being filtered by the post-positioned active carbon, tap water is deeply treated into direct drinking water which can be directly drunk. When the control system detects that the TDS of the outlet water of the ultrafiltration membrane is higher than 150 mg/L, the inlet water of the ultrafiltration membrane is closed, the control system can control the backwashing unit to clean the ultrafiltration membrane, and the cleaning flow rate is controlled to be 30L/min and the cleaning time is controlled to be 1.5 h. The water used for backwashing is pure water prepared by a commercial water purifier, and the backwashing water is collected by a pipeline and can be used as daily other water. And after the backwashing is finished, detecting whether the TDS of the effluent of the ultrafiltration membrane is higher than 150 mg/L. If the TDS of the effluent of the ultrafiltration membrane is higher than 150 mg/L, the control system can control the bipolar membrane electrodialysis system to prepare 1.1 mol/L hydrochloric acid and 1.1 mol/L sodium hydroxide from a NaCl solution to carry out acid washing and alkali washing on the ultrafiltration membrane, the pH value of the acid washing solution is 2, and the acid washing is carried out for 1.5 h; the alkaline cleaning solution is sodium hydroxide, the pH value of the alkaline cleaning solution is 11, the alkaline cleaning is carried out for 1.5 h, and the alkaline cleaning is carried out after acid-base cleaning. And the backwashing pump cleans the ultrafiltration membrane with clean water until the pH value is less than 7.5, and then the equipment is switched to a normal water production mode.
Example 4
The intelligent self-cleaning process for the commercial water purifier of the embodiment is as follows:
tap water is firstly delivered to the PP cotton filter element through the flowmeter, the flow is controlled at 18L/min, and after being intercepted by the PP cotton filter element, large-particle impurities and suspended matters in the water can be removed. After being filtered by a PP cotton filter element, water enters a front activated carbon filter element, the flow is controlled at 18L/min, the activated carbon is prepared from coconut shells, the average particle size is preferably 1.5mm, and the effective particle size is 0.8 mm. After adsorption by the preposed active carbon, water enters an ultrafiltration unit, the flow is controlled at 18L/min, and the ratio of produced water to return water is controlled at 1 by the ultrafiltration membrane. After being filtered by the ultrafiltration membrane, water enters RO for reverse osmosis, the flow is controlled at 18L/min, and the ratio of produced water to waste water is controlled at 1 by the ultrafiltration membrane. After RO reverse osmosis filtration, the mixture enters post-positioned active carbon, the flow is controlled at 18L/min, the active carbon is prepared from coconut shells, the average particle size is preferably 1.5mm, and the effective particle size is preferably 0.8 mm. After being filtered by the post-positioned active carbon, tap water is deeply treated into direct drinking water which can be directly drunk. When the control system detects that the pressure difference of the RO reverse osmosis inlet and the RO reverse osmosis outlet is higher than a set value of 0.3MPa, the RO reverse osmosis is closed, the control system can control the reverse osmosis to clean the RO reverse osmosis, the cleaning flow is controlled to be 30L/min, and the cleaning time is 1 h. The water used for backwashing is pure water prepared by a commercial water purifier, and the backwashing water is collected by a pipeline and can be used as daily other water. And after the back washing is finished, detecting whether the pressure difference of the RO reverse osmosis inlet and the RO reverse osmosis outlet is higher than 0.3 MPa. If the pressure difference of the inlet and the outlet of the RO reverse osmosis is higher than 0.3MPa, the control system can control the bipolar membrane electrodialysis system to prepare 0.8 mol/L hydrochloric acid and 0.8 mol/L sodium hydroxide from a NaCl solution to carry out acid washing and alkali washing on the RO reverse osmosis, the pH value of an acid washing solution is 3.5, and the acid washing is carried out for 1 hour; the alkaline cleaning solution is sodium hydroxide, the pH value of the alkaline cleaning solution is 9.5, and the alkaline cleaning solution is subjected to alkaline cleaning for 1 hour and acid-base cleaning. And (4) cleaning the RO by using clean water for the backwash pump until the pH value is less than 7.5, and then completing the cleaning, and switching the equipment to a normal water production mode.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. An intelligent self-cleaning system for a commercial water purifier, characterized by: comprises a control system, a back washing system and a bipolar membrane acid-base regeneration system;
pressure sensors are arranged at the inlet and the outlet of the PP cotton filter element unit, the front active carbon filter element unit, the ultrafiltration membrane unit, the RO reverse osmosis unit and the rear active carbon filter element unit in the commercial water purifier, the pressure sensors are connected with a control system, and the control system can receive the pressure change of each unit in real time;
the PP cotton filter element unit, the front active carbon filter element unit, the ultrafiltration membrane unit, the RO reverse osmosis unit and the rear active carbon filter element unit in the commercial water purifier are provided with flow meters, the flow meters are connected with a control system, and the control system can control the flow of each unit in real time;
the inside of the commercial water purifier is provided with a bipolar membrane acid-base regeneration system and a backwashing system, and the bipolar membrane acid-base regeneration system and the backwashing system are connected with a control system;
the bipolar membrane acid-base regeneration system adopts a bipolar membrane electrodialysis system.
2. The intelligent self-cleaning system for commercial water purifiers of claim 1, wherein: the back washing system in the commercial water purifier can wash polluted units of the PP cotton filter element, the front activated carbon filter element, the ultrafiltration membrane, the RO reverse osmosis and the rear activated carbon filter element with large flow of water, the washed wastewater enters the collecting device through the washing neutralization pipeline, and all the wastewater in the washing process is gathered together through the collecting pipeline and can be used as daily other water.
3. The intelligent self-cleaning system for commercial water purifiers of claim 1, wherein: the bipolar membrane electrodialysis system is composed of membrane piles, wherein the membrane piles are composed of positive membranes, negative membranes and 10 pairs of bipolar membranes, the three groups of membrane piles are connected in series to form an acid chamber, an alkali chamber and a salt chamber which form the bipolar membrane electrodialysis system, the membrane piles are close to the positive plates and the negative plates to form the electrode chambers, the bipolar membrane electrodialysis system further comprises a voltage-stabilized power supply, and the bipolar membrane electrodialysis system works under a control system.
4. The intelligent self-cleaning system for commercial water purifiers of claim 3, wherein: a mass sensor is arranged in a salt chamber of the bipolar membrane electrodialysis system, the mass of added NaCl can be detected through weighing, and then a control system controls certain pure water to enter the salt chamber to prepare high-concentration salt water with certain concentration.
5. The intelligent self-cleaning system for commercial water purifiers of claim 3, wherein: the salt chamber of the bipolar membrane electrodialysis system is internally provided with an ultrasonic instrument and a conductivity detector, and the salt chamber is provided with an indicator light
The indicator light is connected to a mass sensor in the salt chamber.
6. The method for cleaning the intelligent self-cleaning system of the commercial water purifier, as recited in any one of claims 1 to 5, is characterized in that the control system can monitor the pressure difference before and after each step of treatment process of the PP cotton filter element, the preposed activated carbon filter element, the ultrafiltration membrane, the RO reverse osmosis and the postpositive activated carbon filter element and the TDS value of the effluent in real time, and the method comprises the following specific steps:
(1) after receiving the signal, the control system adjusts the inlet and outlet flow of each step of treatment process according to a set program;
(2) after the control system detects that the pressure at the inlet and the outlet of one step of treatment process or the TDS of the effluent is higher than a set value, the control system closes the water inlet of the equipment, starts the back washing system to carry out reverse large-flow washing on the polluted plugging unit, and the waste water after washing is gathered together through a collecting pipeline and can be used as daily other water;
(3) after the backwashing system is washed, if the inlet and outlet pressure or the TDS of the effluent of the treatment process is higher than a set value, the added NaCl and the reserved pure water are mixed to prepare high-concentration brine through the added NaCl by the bipolar membrane system, and the NaCl solution is prepared into hydrochloric acid and a sodium hydroxide solution through the bipolar membrane acid-base regeneration system; the polluted treatment process section is subjected to acid washing by hydrochloric acid prepared by a bipolar membrane system, alkali washing is carried out after the acid washing until the inlet and outlet pressure of the treatment process or the TDS of effluent is recovered to a normal value, and the acid washing and the alkali washing are stopped; the whole polluted unit is washed by the control system until the pH value of the effluent returns to neutral, the washing is finished, and all the wastewater in the washing process is gathered together through the collecting pipeline and can be used as daily other water.
7. The cleaning method for the intelligent self-cleaning system of commercial water purifiers according to claim 6, characterized in that: the backwashing system is characterized in that backwashing water used by the backwashing system is pure water prepared by a commercial water purifier, the backwashing flow is 20-40L/min, the backwashing water can be used as daily other water after being collected by a pipeline, the backwashing system can carry out fixed-point reverse large-flow flushing on a polluted unit, the backwashing system can also carry out water washing on a filtering unit after being washed by acid and alkali, the water washing flow is 20-40L/min, wherein the acid washing flow is 1-2 hours, the alkali washing flow is 1-2 hours after the acid washing, the backwashing water is washed to be neutral after the acid washing and the alkali washing are finished, an online pH meter is arranged in the backwashing system, the washing is finished when the pH value of the backwashing water is less than 7.5, and the equipment is switched to a normal water preparation mode.
8. The cleaning method for the intelligent self-cleaning system of commercial water purifiers according to claim 6, characterized in that: the water inlet pressure of the acid chamber, the alkali chamber and the salt chamber is 0.1-0.2 MPa, the outlet pressure is 0.1-0.2 MPa, the water inlet pressure of the polar water is 0.1-0.2 MPa, the water outlet pressure is 0.1-0.2 MPa, the water outlet flow of the acid chamber, the alkali chamber and the salt chamber is 1-20L/min, the water outlet flow of the polar water is 10-40L/min, a transformer in the membrane stack converts alternating current into direct current, and the operating voltage is 9-20V.
9. The cleaning method for the intelligent self-cleaning system of commercial water purifiers according to claim 6, characterized in that: the initial acid concentration of the acid chamber is 0.03-0.05mol/L HCl, the initial alkali concentration of the alkali chamber is 0.03-0.05mol/L NaOH, the salt chamber is 0.4-1 mol/L NaCl, and the flow ratio of acid, alkali and salt is kept to be 1:1:1 in order to maintain the pressure balance of the system in the bipolar membrane acid-alkali regeneration system.
10. The cleaning method for the intelligent self-cleaning system of commercial water purifiers according to claim 6, characterized in that: the operating current of the bipolar membrane electrodialysis system is kept in a constant current state, and the current density on the membrane is 30-50 mA/cm2The pressure difference between the front and the back of the bipolar membrane electrodialysis membrane is kept within 0.2 MPa, and the conductivity of the salt chamber is kept at 180-300 ms/cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111186148.5A CN113788556A (en) | 2021-10-12 | 2021-10-12 | Intelligent self-cleaning system and cleaning process for commercial water purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111186148.5A CN113788556A (en) | 2021-10-12 | 2021-10-12 | Intelligent self-cleaning system and cleaning process for commercial water purifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113788556A true CN113788556A (en) | 2021-12-14 |
Family
ID=78877920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111186148.5A Pending CN113788556A (en) | 2021-10-12 | 2021-10-12 | Intelligent self-cleaning system and cleaning process for commercial water purifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113788556A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07265627A (en) * | 1994-03-28 | 1995-10-17 | Ngk Insulators Ltd | Washer for water purifier |
| CN101712494A (en) * | 2008-09-29 | 2010-05-26 | 杜也兵 | Drawer type water purifier |
| CN201791483U (en) * | 2010-08-02 | 2011-04-13 | 田海军 | Chemical back flushing device for mine water membrane purification |
| CN204434390U (en) * | 2015-01-30 | 2015-07-01 | 佛山市顺德区美的饮水机制造有限公司 | Water-purifying machine |
| CN108176229A (en) * | 2017-12-01 | 2018-06-19 | 大同煤矿集团有限责任公司 | Ultra-filtration element groundwater pollution control in water process |
| CN208916925U (en) * | 2018-04-11 | 2019-05-31 | 南京水杯子净水科技有限公司 | It is a kind of can auto-flushing filter core household water filter |
| CN111112214A (en) * | 2019-12-31 | 2020-05-08 | 佛山市云米电器科技有限公司 | Cleaning method of household water treatment device |
| CN111925032A (en) * | 2020-08-06 | 2020-11-13 | 广东蓝鸥净水设备制造有限公司 | Water tank-free mutual-flushing water purification equipment and ultrafiltration membrane mutual-flushing control method |
| CN212403567U (en) * | 2020-02-17 | 2021-01-26 | 南京诺润机械科技有限公司 | Reverse osmosis membrane purifier |
| CN112744964A (en) * | 2020-12-08 | 2021-05-04 | 青岛海尔施特劳斯水设备有限公司 | Water purifying device, self-cleaning filtering system and method |
-
2021
- 2021-10-12 CN CN202111186148.5A patent/CN113788556A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07265627A (en) * | 1994-03-28 | 1995-10-17 | Ngk Insulators Ltd | Washer for water purifier |
| CN101712494A (en) * | 2008-09-29 | 2010-05-26 | 杜也兵 | Drawer type water purifier |
| CN201791483U (en) * | 2010-08-02 | 2011-04-13 | 田海军 | Chemical back flushing device for mine water membrane purification |
| CN204434390U (en) * | 2015-01-30 | 2015-07-01 | 佛山市顺德区美的饮水机制造有限公司 | Water-purifying machine |
| CN108176229A (en) * | 2017-12-01 | 2018-06-19 | 大同煤矿集团有限责任公司 | Ultra-filtration element groundwater pollution control in water process |
| CN208916925U (en) * | 2018-04-11 | 2019-05-31 | 南京水杯子净水科技有限公司 | It is a kind of can auto-flushing filter core household water filter |
| CN111112214A (en) * | 2019-12-31 | 2020-05-08 | 佛山市云米电器科技有限公司 | Cleaning method of household water treatment device |
| CN212403567U (en) * | 2020-02-17 | 2021-01-26 | 南京诺润机械科技有限公司 | Reverse osmosis membrane purifier |
| CN111925032A (en) * | 2020-08-06 | 2020-11-13 | 广东蓝鸥净水设备制造有限公司 | Water tank-free mutual-flushing water purification equipment and ultrafiltration membrane mutual-flushing control method |
| CN112744964A (en) * | 2020-12-08 | 2021-05-04 | 青岛海尔施特劳斯水设备有限公司 | Water purifying device, self-cleaning filtering system and method |
Non-Patent Citations (2)
| Title |
|---|
| 方志刚等: "《海水淡化与舰船淡水保障》", 31 March 2016, 国防工业出版社 * |
| 李景芬等: "苦咸水淡化设备运行问题分析", 《农村水利》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN215559587U (en) | Purifier, self-cleaning filtration system | |
| CN203683245U (en) | Water purifier with automatic water quality detection and intelligent prompt functions | |
| CN105668896A (en) | Purified water preparation system | |
| CN200958059Y (en) | Reverse osmose water purifier | |
| CN214571340U (en) | Deionized water treatment system | |
| CN205061765U (en) | On -vehicle integrated water purification unit | |
| CN212609718U (en) | Household water purifying device and under-kitchen water purifier | |
| CN211972026U (en) | Ultrapure water preparation system for laboratory | |
| CN105347440A (en) | Backwashing system and process for filter membrane cleaning | |
| CN211367282U (en) | High-purity water treatment system | |
| CN219907291U (en) | Direct drinking water purifying system | |
| CN113788556A (en) | Intelligent self-cleaning system and cleaning process for commercial water purifier | |
| CN205803210U (en) | Spring water automatic producing device | |
| CN212532587U (en) | Bipolar membrane water purification system and water purification unit | |
| CN216129416U (en) | Drinking water defluorination clean system | |
| CN206255944U (en) | A kind of 12 tons of ultra-pure water EDI systems per hour | |
| CN212151928U (en) | Water purification system and water purifier with desalination purification performance | |
| CN212954669U (en) | Multi-stage filtration water purification system and water purifier | |
| CN211644929U (en) | Plateau water filtering system | |
| CN204727710U (en) | A kind of domestic energy-conserving water-purifying machine | |
| CN201010598Y (en) | Multifunctional water processor | |
| CN112979022A (en) | Preparation and cleaning process of ultrapure water device in laboratory | |
| CN205295048U (en) | Purifier is used at complemental five kinds of water treatment modes integration family of photovoltaic and commercial power | |
| CN214115298U (en) | System for preparing boiler make-up water from circulating cooling sewage of power plant | |
| CN214457403U (en) | Deionized water purification treatment device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211214 |
|
| RJ01 | Rejection of invention patent application after publication |