Direct drinking water system with ultrafiltration membrane ozone synergistic pulse cleaning device

Abstract

The direct drinking water system comprises a pretreatment device, a membrane treatment device, a finished product water tank, a cleaning device, a water supply branch and a water return branch, the cleaning device comprises a concentrated water tank, a gas-liquid mixing branch, a bypass pipeline, a pulse water supply branch, a cleaning main pipe, a forward washing branch, a backwashing branch and a lower opening sewage branch. According to the utility model, quick switching in the cleaning process of the hollow fiber membrane is realized, the highest and lowest pressurization values in each period are accurately controlled, and meanwhile, adverse effects on membrane water production caused by water production of a water hammer and an air hammer are avoided; the pulse type positive and back washing is combined, so that the membrane pollutants are removed more thoroughly; according to the device, ozone microbubbles of a cleaning medium are exploded, so that the pollutant removal capacity is also improved; and when the filtered water in the finished water tank is stored for a long time, the ozone aeration device can also be used for sterilizing the filtered water, so that the application range of the device is expanded, and the safety of direct drinking water is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field, especially relate to the cleaning device and cleaning method of wading filter membrane. BACKGROUND

[0002] Hollow fiber ultrafiltration membrane refers to be made by asymmetric polymer, the appearance is fibrous, the inside surface with self-supporting effect is a layer of very thin membrane, the self-supporting effect makes that ultrafiltration membrane can carry out backwashing, and the pollutants in the filtration process of ultrafiltration membrane are not easy to stay in the membrane interior and form deep pollution, so it has stronger anti-pollution performance and cleaning easy recovery, and the flow channel density of unit filling is high, the specific surface area of membrane is high, the operating pressure is low, the energy consumption is small, the flux is high and can backwash, and it is widely used in material separation and various water treatment.

[0003] In use, the raw solution enters from the inner hole of the membrane filament, is driven by a low pressure difference and is separated and filtered according to the molecular weight of solute, penetrates the hollow fiber from inside to outside along the radial direction, therefore the permeate liquid containing water, ions and small molecular weight substances is collected on the outside of the membrane filament, and pollutants such as high molecular organic matter, bacteria, suspended particles, pyrogen, colloids of various silicas, iron and aluminum, bacteria, viruses and protozoa are intercepted in the membrane filament, most of the above pollutants are discharged through the concentrated water, and a small amount of pollutants are intercepted and accumulated on the membrane surface.

[0004] After a period of operation, the interception and accumulation of pollutants on the membrane surface become increasingly serious, the flux of the membrane decreases, or the operating pressure increases, and the membrane needs to be cleaned regularly.

[0005] In the selection of the physical cleaning method of the hollow fiber ultrafiltration membrane, since the hollow fiber ultrafiltration membrane adopts a columnar and high-density membrane filament in unit section, ultrasonic cleaning cannot be implemented, therefore pulse cleaning is the most efficient physical cleaning method in the existing physical cleaning methods of the hollow fiber membrane, when the cleaning water is passed through the membrane surface where pollutants are intercepted and accumulated in the form of pulses, the purpose of membrane surface cleaning is achieved through the joint action of vibration and impact.

[0006] Among the pulse cleaning methods of general filtration membranes, gas-liquid pulse is the most common form, this method forms a pulse fluid by passing high-pressure gas into the gap in the uniform flow liquid cleaning medium, and impacts the pollutants in the form of air hammer to achieve the purpose of decontamination. However, for hollow fiber membranes, the impact of air hammer is easy to break the hollow fiber membrane, resulting in damage such as broken filament and leaked filament.

[0007] The intermittent flow is another pulse cleaning form, and the intermittent pressurization and stop of the cleaning medium is realized. However, in the process of the pressurization and stop of the cleaning in each pulse period, the average pressure change value is too large, exceeds the maximum pressure change range that the hollow fiber membrane can bear, and the hollow fiber membrane is easily damaged.

[0008] The continuous medium pulse cleaning form with high and low pressure difference is the most secure pulse cleaning form for the hollow fiber membrane at present. In the pressurized water of the cleaning medium in each pulse period, the highest and lowest pressurization values in each period are quickly switched and accurately controlled, the medium water pressure for the cleaning of the hollow fiber membrane is ensured, the pressure change of the pulse cleaning medium exceeding the maximum pressure change range that the membrane can bear is avoided, and the efficient cleaning of the membrane is realized.

[0009] The continuous medium pulse cleaning form with high and low pressure difference cannot be realized by adjusting the medium pressure through the frequency conversion water pump at the present stage, because the frequency conversion water pump has a long time for realizing pressure regulation, and cannot meet the requirement of the short period high and low pressure quick switching of the medium pulse cleaning.

[0010] In the specification of the utility model patent "CN107073404A", two pulse cleaning forms of the membrane are disclosed. One is to control by arranging an electromagnetic valve in the pipeline in front of the cleaning medium booster pump, to realize the intermittent flow pulse cleaning by the quick switching of the opening and closing of the electromagnetic valve. However, the problem of this method is that the water hammer formed in the closing process of the electromagnetic valve will impact the pipeline, and has an adverse effect on the water production of the booster pump. The other is to introduce a bypass pipeline in the pipeline in front of the booster pump, the bypass pipeline extends to the water tank, an electromagnetic pressure reducing valve is arranged on the bypass pipeline, the highest pressure is realized by the closing of the electromagnetic pressure reducing valve, and the lowest pressure is realized by the opening of the electromagnetic pressure reducing valve, so as to realize the continuous medium pulse cleaning with high and low pressure difference. However, the biggest problem of this method is that the water hammer is formed in the closing moment of the electromagnetic pressure reducing valve, so the accurate control of the high and low pressure switching of the medium cannot be realized, the high pressure resistance range and the maximum pressure change resistance range of the hollow fiber membrane are easily broken, and the membrane is damaged. Utility model content

[0011] The utility model aims at at least solving the technical defects, and realizes the quick switching and accurate control of the highest and lowest pressurization values of the pulse cleaning of the hollow fiber ultrafiltration membrane.

[0012] Therefore, the utility model provides a direct drinking water system with an ultrafiltration membrane ozone cooperative pulse cleaning device, which is characterized by comprising a pretreatment device, a membrane treatment device, a finished water tank, a cleaning device, a water supply branch and a backwater branch.

[0013] The utility model discloses a direct drinking water system with an ultrafiltration membrane ozone cooperative pulse cleaning device.

[0014] The pretreatment device comprises, in sequence along the water flow direction, a municipal pipeline, a raw water tank, a raw water tank outlet booster pump, a quartz sand filter, an activated carbon filter, and a water supply precision filter.

[0015] The connecting pipeline of the municipal pipeline and the raw water tank is provided with an electric valve.

[0016] The membrane treatment device comprises an ultrafiltration membrane booster pump, two or more hollow fiber ultrafiltration membranes connected in parallel, two or more filtration outlet pipelines connected in parallel, two or more filtration water branch pipes, a filtration water main pipe, an intermediate water tank, a sewage main pipe, a nanofiltration booster pump, and a nanofiltration unit.

[0017] The hollow fiber ultrafiltration membrane is a cylindrical, high unit packing density, cross-flow filtration internal pressure type hollow fiber membrane.

[0018] The outlet pipeline of the ultrafiltration membrane booster pump is provided, in sequence along the water flow direction, with an electromagnetic valve and a pressure sensor.

[0019] The ultrafiltration membrane booster pump is connected to the lower outlets of two or more hollow fiber ultrafiltration membranes, two filtration outlets corresponding to one hollow fiber ultrafiltration membrane are connected to each other to form the filtration outlet pipeline connected in parallel, the filtration outlet pipeline connected in parallel is connected to the filtration water branch pipe, two or more filtration water branch pipes are connected in parallel to the water inlet end of the filtration water main pipe, and the water outlet end of the filtration water main pipe is connected to the intermediate water tank.

[0020] The upper outlet pipelines of two or more hollow fiber ultrafiltration membranes are connected in parallel to the sewage main pipe.

[0021] The filtration water branch pipe is provided with the electromagnetic valve.

[0022] The filtration water main pipe is provided, in sequence along the water flow direction, with the pressure sensor, an electric conductivity sensor, and the electromagnetic valve.

[0023] The intermediate water tank, the nanofiltration booster pump, and the nanofiltration unit are connected in sequence.

[0024] The outlet pipeline of the nanofiltration unit is connected in parallel to the finished water tank, and the outlet pipeline is provided with an electromagnetic valve.

[0025] The top of the finished water tank is provided with a breather.

[0026] The cleaning device comprises a concentrated water tank, a gas-liquid mixing branch, a bypass pipeline, a pulse water supply branch, a cleaning main pipe, a forward washing branch, a reverse washing branch, and a lower sewage branch.

[0027] The pipeline of the gas-liquid mixing branch is provided, in sequence along the water flow direction, with a gas-liquid mixing variable frequency booster pump, the pressure sensor, the electromagnetic valve, a jet device, a water mixer, a flowmeter, a check valve, and an electric valve.

[0028] The electric valve in the gas-liquid mixed branch accesses the top water inlet of the finished water tank;

[0029] In the gas-liquid mixed branch, the water outlet pipeline of the pressure sensor is connected with the water outlet pipeline of the check valve, and the bypass pipeline is connected therebetween;

[0030] The electromagnetic valve is arranged on the bypass pipeline;

[0031] The gas inlet pipeline of the jet device is sequentially provided with an ozone generator and a gas flow controller in the direction of gas flow;

[0032] The water outlet of the finished water tank is connected with the water inlet of the gas-liquid mixed variable-frequency booster pump;

[0033] The pulse water supply branch comprises an electromagnetic overflow valve, an electromagnetic pressure reducing valve and the electromagnetic valve;

[0034] The water inlet pipelines of the electromagnetic overflow valve, the electromagnetic pressure reducing valve and the electromagnetic valve in the pulse water supply branch are connected with the water outlet pipeline of the check valve;

[0035] The water outlet pipeline of the electromagnetic overflow valve is connected with the finished water tank;

[0036] The water outlet pipelines of the electromagnetic valve and the electromagnetic pressure reducing valve in the pulse water supply branch are connected with the cleaning dry pipeline;

[0037] One hollow fiber ultrafiltration membrane corresponds to one forward washing branch and one backwashing branch respectively, the water outlet of the forward washing branch is connected with the lower outlet connecting pipeline of the hollow fiber ultrafiltration membrane, and the water outlet of the backwashing branch is connected with the corresponding connected filtration water outlet pipeline;

[0038] The forward washing branch and the backwashing branch are respectively provided with the electromagnetic valve;

[0039] The check valve is arranged at the connecting pipeline of the water outlet of the forward washing branch and the water outlet pipeline of the ultrafiltration membrane booster pump;

[0040] The lower outlet sewage branch is provided with the electromagnetic valve, the water inlet of the lower outlet sewage branch is connected with the lower outlet pipeline of the hollow fiber ultrafiltration membrane, and the water outlet of the lower outlet sewage branch is connected with the blowdown dry pipeline;

[0041] The blowdown dry pipeline is connected with the concentrated water tank;

[0042] The concentrated water tank is provided with the breather at the top end.

[0043] The water supply branch comprises a water supply variable-frequency booster pump, a pressure sensor and a water supply ultraviolet lamp;

[0044] The finished water tank, the water supply variable frequency booster pump, the pressure sensor, and the water supply ultraviolet lamp are sequentially connected by pipelines.

[0045] The backwater branch includes the electric valve, a backwater ultraviolet lamp, and a backwater precision filter.

[0046] The electric valve, the backwater ultraviolet lamp, and the backwater precision filter are sequentially connected by pipelines.

[0047] The outlet pipeline of the backwater precision filter is connected to the inlet of the finished water tank.

[0048] For the hollow fiber ultrafiltration membrane with strong oxidation resistance, the utility model realizes a method for ozone and pulse cleaning of the hollow fiber ultrafiltration membrane by the ozone and pulse cleaning device for operating the ultrafiltration membrane,

[0049] Related parameters:

[0050] The pressure value measured by the pressure sensor in the outlet pipeline of the ultrafiltration membrane booster pump is P1.

[0051] The pressure value measured by the pressure sensor in the filtered water main is P2.

[0052] The electrical conductivity value measured by the conductivity sensor in the filtered water main is S.

[0053] The liquid flow per unit time measured by the flow meter in the gas-liquid mixing branch is M1.

[0054] The gas flow per unit time measured by the gas flow controller is M2.

[0055] The ozone generator prepares ozone with a concentration of N.

[0056] The pressure value measured by the pressure sensor in the gas-liquid mixing branch is P3.

[0057] The hollow fiber ultrafiltration membrane is flushed after a cumulative water production time of T1, and in each flushing, the pulse forward washing lasts for a period of T2, and the pulse backwashing lasts for a period of T3.

[0058] The electromagnetic overflow valve is set to a pressure of P4, that is, the pressure of the inlet pipeline of the electromagnetic overflow valve is not greater than P4.

[0059] The electromagnetic pressure reducing valve is set to a pressure of P5, that is, the pressure of the outlet pipeline of the liquid flowing through the electromagnetic pressure reducing valve is not greater than P5.

[0060] The pulse water supply frequency in the pulse water supply branch is F.

[0061] The interval time for storing filtered water in the finished water tank for disinfection is T4, and the disinfection time is T5.

[0062] comprising the steps of:

[0063] 1) Water production step of the hollow fiber ultrafiltration membrane:

[0064] According to the quality of the filtered raw water and the design process of the hollow fiber ultrafiltration membrane, the inlet pressure parameter of the hollow fiber ultrafiltration membrane during water production is set;

[0065] Water production: The electromagnetic valves of the ultrafiltration membrane booster pump outlet pipeline, the filtered water branch pipeline, and the filtered water main pipeline are opened, the ultrafiltration membrane booster pump is opened and constant pressure water supply is provided, that is, P1 is equal to the set inlet pressure parameter of the hollow fiber ultrafiltration membrane; In this step, raw water flows through the ultrafiltration membrane booster pump, the lower port of the hollow fiber ultrafiltration membrane, and the connected filtered water outlet pipeline to complete filtration, forming produced water, and then the produced water flows into the intermediate water tank through the filtered water branch pipeline and the filtered water main pipeline, and at the same time, the concentrated water flows through the upper port of the hollow fiber ultrafiltration membrane and the sewage main pipeline to the municipal sewage pipeline or to the set concentrated water tank;

[0066] Warning:

[0067] According to the quality of the filtered raw water and the design process of the hollow fiber ultrafiltration membrane, T1 is set;

[0068] During the water production process of the hollow fiber ultrafiltration membrane, when the water production time T1 or P1-P2 is greater than the maximum transmembrane pressure difference (TMP) or S is greater than the set value, the device stops running and warns to wait for cleaning;

[0069] 2) Pulse forward washing step of the hollow fiber ultrafiltration membrane:

[0070] According to the quality of the filtered raw water and the design process of the hollow fiber ultrafiltration membrane, T2, the high value of the pulse cleaning inlet pressure of the lower port of the hollow fiber membrane during the forward washing process, and the parameter of the ozone mixed solution concentration are set respectively;

[0071] Water production device is closed: the electromagnetic valves of the ultrafiltration membrane booster pump outlet pipeline, the filtered water branch pipeline, and the filtered water main pipeline are closed, and the ultrafiltration membrane booster pump is closed;

[0072] Constant pressure water supply at the front end of the cleaning device: in the cleaning device, the gas-liquid mixed variable frequency booster pump is opened and constant pressure control is performed, that is, the parameter of the pulse cleaning inlet water pressure high value of the hollow fiber membrane lower port in the forward washing process is monitored, and then the gas-liquid mixed variable frequency booster pump stabilizes the power output; the electromagnetic valve in the gas-liquid mixed branch is opened, and the electric valve is closed; the electromagnetic valve in the bypass pipeline is closed; in this step, the filtered water in the finished water tank is supplied with constant pressure water by the gas-liquid mixed variable frequency booster pump at the pulse inlet water pressure high value required for forward washing;

[0073] Ozone mixed liquid is realized: the ozone generator and the gas flow controller are opened, and the gas flow controller controls the ozone flow, so that ρ 臭氧 *N*M2 / M1 is equal to the set parameter of the ozone mixed liquid concentration in the forward washing process; in this step, the filtered water forms an ozone mixed liquid in the jetifier;

[0074] Cleaning device ozone cooperative pulse water supply: in the pulse water supply branch, the electromagnetic overflow valve is opened, and P4 is set to be equal to the pulse inlet water pressure high value parameter of the hollow fiber ultrafiltration membrane lower port in the forward washing process; the electromagnetic pressure reducing valve is opened, and P5 is set so that (P4-P5)*F≤the maximum pressure change value per unit time that the hollow fiber ultrafiltration membrane can withstand; set F to be any value in the interval of 0.2~5, and the electromagnetic valve in the pulse water supply branch is opened and closed at a frequency of F; the electromagnetic valves in two or more forward washing branches are opened, the electromagnetic valves in two or more backwashing pipelines are closed, and the electromagnetic valves in two or more lower port sewage branches are closed; in this step, the ozone mixed liquid is used as a cleaning medium, and the electromagnetic valve in the pulse water supply branch is opened and closed at a frequency of F; when the electromagnetic valve is opened, the cleaning medium flows into the cleaning main pipe through the pipeline where the electromagnetic valve is located, so that the water supply pressure at this time is the forward washing set P4 value; when the electromagnetic valve is closed, the cleaning medium flows into the cleaning main pipe through the electromagnetic pressure reducing valve at the forward washing set P5 value, and the water hammer formed during the closing of the electromagnetic valve is overflowed through the electromagnetic overflow valve, thereby forming pulse water supply to the cleaning main pipe with the highest and lowest pressure values of the forward washing set P4 and P5, and then the cleaning medium flows through the forward washing branch in sequence to the lower port of the hollow fiber ultrafiltration membrane, the pollution accumulation surface of the membrane wire in the hollow fiber ultrafiltration membrane, the upper port of the hollow fiber ultrafiltration membrane, the sewage main pipe to the concentrated water tank, thereby realizing ozone cooperative pulse forward washing of the hollow fiber ultrafiltration membrane;

[0075] 3) Pulse backwashing step of the hollow fiber ultrafiltration membrane:

[0076] When the pulse forward washing T2 reaches the set length, immediately switch to pulse backwashing, according to the filtered raw water quality and the hollow fiber ultrafiltration membrane design process parameter, set T3 and the pulse water inlet pressure high value parameter of the hollow fiber ultrafiltration membrane in the backwashing process;

[0077] The water making device maintains the closed state unchanged;

[0078] Constant pressure water supply at the front end of the cleaning device: in the cleaning device, the gas-liquid mixed variable frequency booster pump is opened and constant pressure control is carried out, that is, P3 is equal to the pulse water inlet pressure high value parameter of the hollow fiber ultrafiltration membrane in the backwashing process; the electromagnetic valve in the bypass pipeline is opened; the electromagnetic valve, the electric valve, the ozone generator and the gas flow controller in the gas-liquid mixed branch are closed; in this step, the filtered water in the finished water tank is used as the flushing medium, and the filtered water is supplied to the bypass pipeline at the pulse water inlet pressure high value required for backwashing through the gas-liquid mixed variable frequency booster pump under constant pressure;

[0079] Pulse water supply of the cleaning device: in the pulse water supply branch, the electromagnetic overflow valve is opened, and P4 is also set to be equal to the pulse water inlet pressure high value parameter of the hollow fiber ultrafiltration membrane in the backwashing process; the electromagnetic pressure reducing valve is opened, and P5 is set so that (P4-P5)*F≤the maximum pressure change value per unit time that the hollow fiber ultrafiltration membrane can withstand; F is set to be any value in the interval of 0.2~5, and the electromagnetic valve in the pulse water supply branch is opened and closed at a frequency of F; the electromagnetic valves in two or more forward washing branches are closed, the electromagnetic valves in two or more backwashing branches are opened, and the electromagnetic valves in two or more lower sewage outlet branches are opened; in this step, the cleaning medium is opened and closed in the pulse water supply branch at a frequency of F, when the electromagnetic valve is opened, the cleaning medium flows through the cleaning main pipe through the pipeline where the electromagnetic valve is located, so the water supply pressure at this time is P4 value set in backwashing, when the electromagnetic valve is closed, the cleaning medium is supplied to the cleaning main pipe at a pressure of P5 value set in backwashing, and the water hammer formed during the closing of the electromagnetic valve will overflow through the electromagnetic overflow valve, thereby forming pulse water supply to the cleaning main pipe with P4 and P5 as the highest and lowest pressure values, and then the cleaning medium flows through the backwashing branch, the parallel filtration outlet pipeline to the membrane filaments of the hollow fiber ultrafiltration membrane in turn, backwashes the membrane filaments of the hollow fiber ultrafiltration membrane, and sewage is discharged from the upper and lower outlets of the hollow fiber ultrafiltration membrane to the sewage main pipe, and finally flows to the concentrated water tank, thereby realizing pulse backwashing of the membrane filaments in the hollow fiber ultrafiltration membrane.

[0080] When T3 is reached, the devices opened in the backwashing process are closed.

[0081] 4) The step of storing filtered water in the finished water tank for ozone mixed liquid circulation disinfection:

[0082] The parameters of T4, T5, circulating disinfecting water supply pressure and ozone mixed solution concentration are set according to the water quality requirement of the finished water in the finished water tank, when T4 reaches the set time length and after the hollow fiber ultrafiltration membrane positive washing and backwashing stop running, the filtered water stored in the finished water tank is disinfected, and the disinfection step is not affected by whether the hollow fiber ultrafiltration membrane produces water or not;

[0083] Part of the equipment in the cleaning device is closed: only the equipment in the gas-liquid mixed branch is turned on, and all the equipment in the cleaning device is closed;

[0084] Ozone mixed solution circulating disinfection: the gas-liquid mixed variable frequency booster pump is controlled at constant pressure, that is, P3 is monitored to be equal to the set parameter of the circulating disinfection water supply pressure; the ozone generator and the gas flow controller are turned on, and the gas flow controller controls the ozone flow to make ρ 臭氧 *N*M2 / M1 is equal to the set parameter of the ozone mixed solution concentration in the ozone mixed solution circulating disinfection process; this process circulates and increases the ozone in the stored filtered water in the finished water tank;

[0085] When T4 reaches the time length, the equipment turned on in the ozone mixed solution circulating disinfection process is closed.

[0086] The utility model has the advantages and positive effects that: through a high-low pressure difference continuous medium pulse cleaning device, the highest and lowest pressurization values in each period can be quickly switched and accurately controlled, water hammer and air hammer are avoided, and the membrane water production is not affected; the pulse positive and back flushing are combined, and the membrane pollution is removed more thoroughly; the device also increases the removal capacity of pollutants through ozone micro-bubble explosion of the cleaning medium; when the filtered water in the finished water tank is stored for a long time, the ozone explosion device can also be used for disinfecting the filtered water, the use range of the device is expanded, and the safety of direct drinking water is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0087] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0088] Figure 1 It is a schematic diagram of a direct drinking water system with an ultrafiltration membrane ozone cooperative pulse cleaning device of the utility model;

[0089] Figure 2 It is a schematic diagram of a direct drinking water system with an ultrafiltration membrane ozone cooperative pulse cleaning device of the utility model; Figure 1 It is a local enlarged view of the cleaning device.

[0090] In the figure, the electric valve-a, the electromagnetic valve-b, the pressure sensor-c, the conductivity sensor-d, the respirator-e, the check valve-f, the pretreatment device-1, the municipal pipeline-11, the raw water tank-12, the raw water tank outlet booster pump-13, the quartz sand filter-14, the activated carbon filter-15, the water supply precision filter-16, the membrane treatment device-2, the ultrafiltration membrane booster pump-21, the hollow fiber ultrafiltration membrane-22, the parallel connection filter outlet pipeline-23, the filtered water branch-24, the filtered water main-25, the intermediate water tank-26, the sewage main-27, the nanofiltration booster pump-28, the nanofiltration unit-29, the finished water tank-3, the cleaning device-4, the concentrated water tank-41, the gas-liquid mixing branch-42, the jet device-421, the gas flow controller-4211, the ozone generator-4212, the water mixer-422, the flow meter-423, the gas-liquid mixing variable frequency booster pump-424, the bypass pipeline-43, the pulse water supply branch-44, the electromagnetic overflow valve-441, the electromagnetic pressure reducing valve-442, the cleaning main-45, the forward cleaning branch-46, the backwashing branch-47, the lower sewage branch-48, the water supply branch-5, the water supply variable frequency booster pump-51, the water supply ultraviolet lamp-52, the return water branch-6, the return water ultraviolet lamp-61, the return water precision filter-62. DETAILED DESCRIPTION

[0091] The present application will now be described in more detail, by way of example only, with reference to the accompanying drawings in which:

[0092] Example 1: As shown in Figure 1 , 2 , a direct drinking water system with an ultrafiltration membrane ozone cooperative pulse cleaning device, comprising a pretreatment device 1, a membrane treatment device 2, a finished water tank 3, a cleaning device 4, a water supply branch 5, a return water branch 6;

[0093] The pretreatment device 1 comprises a municipal pipeline 11, a raw water tank 12, a raw water tank outlet booster pump 13, a quartz sand filter 14, an activated carbon filter 15, and a water supply precision filter 16 connected in sequence along the water flow direction.

[0094] The connection pipeline between the municipal pipeline 11 and the raw water tank 12 is provided with an electric valve a.

[0095] The membrane treatment device 2 comprises an ultrafiltration membrane booster pump 21, two or more hollow fiber ultrafiltration membranes 22 connected in parallel, two or more filtered water outlet pipelines 23 connected in parallel, two or more filtered water branches 24, a filtered water main 25, an intermediate water tank 26, a sewage main 27, a nanofiltration booster pump 28, and a nanofiltration unit 29.

[0096] The hollow fiber ultrafiltration membrane 22 is a cylindrical, high unit packing density, cross-flow filtration internal pressure type hollow fiber membrane;

[0097] The water outlet pipeline of the ultrafiltration membrane booster pump 21 is sequentially provided with an electromagnetic valve b and a pressure sensor c along the water flow direction;

[0098] The ultrafiltration membrane booster pump 21 is connected to the lower openings of two or more hollow fiber ultrafiltration membranes 22, two filtration water outlets corresponding to one hollow fiber ultrafiltration membrane 22 are connected to each other to form a connected filtration water outlet pipeline 23, the connected filtration water outlet pipeline 23 is connected to a filtration water branch pipeline 24, and two or more filtration water branch pipelines 24 are connected to the water inlet end of a filtration water main pipeline 25, and the water outlet end of the filtration water main pipeline 25 is connected to an intermediate water tank 26;

[0099] The water outlet pipelines of the upper openings of the two or more hollow fiber ultrafiltration membranes 22 are connected to a sewage main pipeline 27;

[0100] The filtration water branch pipeline 24 is provided with an electromagnetic valve b;

[0101] The filtration water main pipeline 25 is sequentially provided with a pressure sensor c, an electric conductivity sensor d, and an electromagnetic valve b along the water flow direction;

[0102] The intermediate water tank 26, a nanofiltration booster pump 28, and a nanofiltration unit 29 are sequentially connected by pipelines;

[0103] The water outlet pipeline of the nanofiltration unit 29 is connected to a finished water tank 3, and an electromagnetic valve b is arranged at the water outlet pipeline;

[0104] A breather e is arranged at the top of the finished water tank 3;

[0105] A cleaning device 4 includes a concentrated water tank 41, a gas-liquid mixing branch 42, a bypass pipeline 43, a pulse water supply branch 44, a cleaning main pipeline 45, a forward washing branch 46, a backwashing branch 47, and a lower opening sewage branch 48;

[0106] A gas-liquid mixing variable frequency booster pump 424, a pressure sensor c, an electromagnetic valve b, a jet device 421, a water mixer 422, a flowmeter 423, a check valve f, and an electric valve a are sequentially arranged along the water flow direction on the pipeline of the gas-liquid mixing branch 42;

[0107] The electric valve a in the gas-liquid mixing branch 42 is connected to the water inlet of the top of the finished water tank 3;

[0108] In the gas-liquid mixing branch 42, the water outlet pipeline of the pressure sensor c and the water outlet pipeline of the check valve f are connected to the bypass pipeline 43;

[0109] An electromagnetic valve b is arranged on the bypass pipeline 43;

[0110] The gas inlet pipe of the jet 421 is provided with an ozone generator 4212 and a gas flow controller 4211 in sequence along the gas flow direction;

[0111] The outlet of the finished water tank 3 is connected to the inlet of the gas-liquid mixed variable frequency booster pump 424;

[0112] The pulse water supply branch 44 comprises an electromagnetic overflow valve 441, an electromagnetic pressure reducing valve 442, and an electromagnetic valve b;

[0113] The inlet pipes of the electromagnetic overflow valve 441, the electromagnetic pressure reducing valve 442, and the electromagnetic valve b in the pulse water supply branch 44 are connected to the outlet pipe of the check valve f;

[0114] The outlet pipe of the electromagnetic overflow valve 441 is connected to the finished water tank 3;

[0115] The outlet pipes of the electromagnetic valve b and the electromagnetic pressure reducing valve 442 in the pulse water supply branch 44 are connected to the cleaning dry pipe 45;

[0116] Each hollow fiber ultrafiltration membrane 22 corresponds to a forward washing branch 46 and a backwashing branch 47, the outlet of the forward washing branch 46 is connected to the lower pipe of the hollow fiber ultrafiltration membrane 22, and the outlet of the backwashing branch 47 is connected to the corresponding parallel filtration outlet pipe 23;

[0117] The forward washing branch 46 and the backwashing branch 47 are respectively provided with an electromagnetic valve b;

[0118] The connection pipe between the outlet pipe of the ultrafiltration membrane booster pump 21 and the outlet of the forward washing branch 46 is provided with a check valve f;

[0119] The lower sewage branch 48 is provided with an electromagnetic valve b, the inlet of the lower sewage branch is connected to the lower pipe of the hollow fiber ultrafiltration membrane 22, and the outlet of the lower sewage branch is connected to the blowdown dry pipe 27;

[0120] The blowdown dry pipe 27 is connected to the concentrated water tank 41;

[0121] The concentrated water tank 41 is provided with a breather e at the top end.

[0122] The water supply branch 5 comprises a water supply variable frequency booster pump 51, a pressure sensor c, and a water supply ultraviolet lamp 52;

[0123] The finished water tank 3, the water supply variable frequency booster pump 51, the pressure sensor c, and the water supply ultraviolet lamp 52 are connected in sequence by pipes;

[0124] The backwater branch 6 comprises an electric valve a, a backwater ultraviolet lamp 61, and a backwater precision filter 62;

[0125] The electric valve a, the backwater ultraviolet lamp 61, and the backwater precision filter 62 are connected in sequence by pipes;

[0126] The outlet pipe of the backwater precision filter 62 is connected to the inlet of the finished water tank 3.

[0127] The utility model is described in detail through the above examples, but the content is only the preferred embodiment of the utility model and cannot be considered as limiting the implementation scope of the utility model. Any equivalent change and improvement made according to the application scope of the utility model should still belong to the patent coverage scope of the utility model.

Claims

1. A direct drinking water system with ozone synergistic pulse cleaning device of ultrafiltration membrane, it is characterized in being: Including pretreatment device (1), membrane treatment device (2), finished water tank (3), cleaning device (4), water supply branch (5), backwater branch (6); The pretreatment device (1), including the municipal pipeline (11) that is connected in order along water flow direction, raw water tank (12), raw water tank outlet booster pump (13), quartz sand filter (14), activated carbon filter (15), water supply precision filter (16); The municipal pipeline (11) is equipped with electric valve (a) at the connecting pipeline of the raw water tank (12); The membrane treatment device (2), including ultrafiltration membrane booster pump (21), two or more than hollow fiber ultrafiltration membrane (22) parallelly connected, two or more than filtration outlet pipe (23) parallelly connected, two or more than filtration water branch pipe (24), filtration water main pipe (25), intermediate water tank (26), blow-off main pipe (27), nanofiltration booster pump (28), nanofiltration unit (29); The hollow fiber ultrafiltration membrane (22) is the cylindrical, high unit packing density cross-flow filtration inner pressure type hollow fiber membrane; The water outlet pipe of the ultrafiltration membrane booster pump (21) is equipped with solenoid valve (b), pressure sensor (c) in order along water flow direction; The ultrafiltration membrane booster pump (21) is connected with the lower mouth of two or more than the hollow fiber ultrafiltration membrane (22), and two filtration water outlets corresponding to one hollow fiber ultrafiltration membrane (22) are connected with each other to form the parallelly connected filtration outlet pipe (23), the parallelly connected filtration outlet pipe (23) is connected with the filtration water branch pipe (24), two or more than the filtration water branch pipe (24) is connected into the water inlet end of the filtration water main pipe (25), and the water outlet end of the filtration water main pipe (25) is connected with the intermediate water tank (26); Two or more than the hollow fiber ultrafiltration membrane (22) upper mouth water outlet pipe is connected into the blow-off main pipe (27); The filtration water branch pipe (24) is provided with the solenoid valve (b); The filtration water main pipe (25) is sequentially provided with the pressure sensor (c), conductivity sensor (d), the solenoid valve (b) along water flow direction; The intermediate water tank (26), the nanofiltration booster pump (28), the nanofiltration unit (29) are sequentially connected with pipeline; The water outlet pipe of the nanofiltration unit (29) is connected into the finished water tank (3), and the water outlet pipe is provided with solenoid valve (b); The finished water tank (3) top is equipped with breather (e); The cleaning device (4), including concentrated water tank (41), gas-liquid mixing branch (42), bypass pipeline (43), pulse water supply branch (44), cleaning main pipe (45), positive washing branch (46), backwashing branch (47), lower mouth sewage branch (48); The pipeline of the gas-liquid mixing branch (42) is sequentially provided with gas-liquid mixing variable frequency booster pump (424), the pressure sensor (c), the solenoid valve (b), the jet device (421), the water mixer (422), the flowmeter (423), the check valve (f), the electric valve (a) along water flow direction. The electric valve (a) in the gas-liquid mixed branch (42) is connected to the water inlet of the top of the finished water tank (3); In the gas-liquid mixed branch (42), the water outlet pipeline between the pressure sensor (c) and the non-return valve (f) is connected to the bypass pipeline (43); The electromagnetic valve (b) is arranged on the bypass pipeline (43); The gas inlet pipeline of the jet device (421) is sequentially provided with an ozone generator (4212) and a gas flow controller (4211) in the direction of gas flow; The water outlet of the finished water tank (3) is connected to the water inlet of the gas-liquid mixed variable frequency booster pump (424); The pulse water supply branch (44) comprises an electromagnetic overflow valve (441), an electromagnetic pressure reducing valve (442) and the electromagnetic valve (b); The water inlet pipelines of the electromagnetic overflow valve (441), the electromagnetic pressure reducing valve (442) and the electromagnetic valve (b) in the pulse water supply branch (44) are connected to the water outlet pipeline of the non-return valve (f); The water outlet pipeline of the electromagnetic overflow valve (441) is connected to the finished water tank (3); The water outlet pipelines of the electromagnetic valve (b) and the electromagnetic pressure reducing valve (442) in the pulse water supply branch (44) are connected to the cleaning dry pipe (45); One hollow fiber ultrafiltration membrane (22) corresponds to one forward washing branch (46) and one backwashing branch (47), the water outlet of the forward washing branch (46) is connected to the lower outlet connecting pipeline of the hollow fiber ultrafiltration membrane (22), and the water outlet of the backwashing branch (47) is connected to the corresponding connected filtering water outlet pipeline (23); The forward washing branch (46) and the backwashing branch (47) are respectively provided with the electromagnetic valve (b); The non-return valve (f) is arranged at the connecting pipeline between the water outlet pipeline of the ultrafiltration membrane booster pump (21) and the water outlet of the forward washing branch (46); The lower outlet sewage branch (48) is provided with the electromagnetic valve (b), the water inlet of the lower outlet sewage branch is connected to the lower outlet pipeline of the hollow fiber ultrafiltration membrane (22), and the water outlet of the lower outlet sewage branch is connected to the sewage dry pipe (27); The sewage dry pipe (27) is connected to the concentrated water tank (41); The concentrated water tank (41) is provided with the breather (e) at the top end; The water supply branch (5) comprises a water supply variable frequency booster pump (51), a pressure sensor (c) and a water supply ultraviolet lamp (52); The finished water tank (3), the water supply variable frequency booster pump (51), the pressure sensor (c) and the water supply ultraviolet lamp (52) are sequentially connected by pipelines; The backwater branch (6) comprises the electric valve (a), a backwater ultraviolet lamp (61) and a backwater precision filter (62); The electric valve (a), the backwater ultraviolet lamp (61) and the backwater precision filter (62) are sequentially connected by pipelines; The water outlet pipeline of the backwater precision filter (62) is connected to the water inlet of the finished water tank (3).

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