CN114573076A - Drinking water ultrafiltration system without chemical adding and unpowered backwashing and operation method - Google Patents
Drinking water ultrafiltration system without chemical adding and unpowered backwashing and operation method Download PDFInfo
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- CN114573076A CN114573076A CN202011380050.9A CN202011380050A CN114573076A CN 114573076 A CN114573076 A CN 114573076A CN 202011380050 A CN202011380050 A CN 202011380050A CN 114573076 A CN114573076 A CN 114573076A
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- 238000000108 ultra-filtration Methods 0.000 title claims abstract description 440
- 238000011001 backwashing Methods 0.000 title claims abstract description 58
- 239000003651 drinking water Substances 0.000 title claims abstract description 27
- 235000020188 drinking water Nutrition 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000126 substance Substances 0.000 title claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 471
- 239000012528 membrane Substances 0.000 claims abstract description 241
- 238000004519 manufacturing process Methods 0.000 claims abstract description 89
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000010865 sewage Substances 0.000 claims abstract description 27
- 239000003814 drug Substances 0.000 claims abstract description 9
- 239000003344 environmental pollutant Substances 0.000 claims description 25
- 231100000719 pollutant Toxicity 0.000 claims description 25
- 238000005406 washing Methods 0.000 claims description 25
- 238000002791 soaking Methods 0.000 claims description 21
- 230000005484 gravity Effects 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 11
- 230000004907 flux Effects 0.000 claims description 9
- 241000894006 Bacteria Species 0.000 claims description 8
- 244000005700 microbiome Species 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 230000002147 killing effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 235000012206 bottled water Nutrition 0.000 claims 1
- 230000003749 cleanliness Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 7
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009285 membrane fouling Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/18—Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
- B01D65/022—Membrane sterilisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/18—Use of gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a drinking water ultrafiltration system without medicine and power backwashing and an operation method thereof, in the drinking water ultrafiltration system, the delivery port of the ultrafiltration water inlet tank is connected to the water inlet of the ultrafiltration water supply pump through an output pipeline, the ozone generating device is connected to the output pipeline through a pipeline, the delivery port of the ultrafiltration water supply pump is connected with a water supply pipeline, the water supply pipeline is communicated with the water inlet port of the first ultrafiltration membrane unit through a first branch, the water supply pipeline is communicated with the water inlet port of the second ultrafiltration membrane unit through a second branch, the water outlet port of each ultrafiltration membrane unit is connected to a water outlet pipeline through a water outlet branch, the water outlet pipeline is connected to the ultrafiltration water production tank, the air compressor is connected to the water inlet side of each ultrafiltration membrane unit through an air pipeline, the water outlet branches of the two ultrafiltration membrane units are connected to form a backwashing pipeline, and the concentrated water side and the water inlet side of each ultrafiltration membrane unit are provided with sewage discharge ports. The ultrafiltration system has low energy consumption and high cleanliness.
Description
Technical Field
The invention relates to the technical field of drinking water preparation by ultrafiltration, in particular to a drinking water ultrafiltration system without medicine and unpowered backwashing and an operation method thereof.
Background
When groundwater is used as a source of water supply, the main indicators of membrane fouling are suspended solids, colloids, bacteria and microorganisms. The existing conventional ultrafiltration operation process method needs to be equipped with a backwashing pump, an air compressor and the like to eliminate suspended matters and colloid by physical methods such as air washing, water backwashing and the like. Aiming at the pollution of bacteria and microorganisms to the ultrafiltration membrane, the chemical adding device is mainly arranged to add sodium hypochlorite with certain concentration for removing through backwashing, so that the purpose of recovering the membrane flux is achieved.
During ultrafiltration system water among the prior art, the raw water gets into the membrane module under the pressure drive of water supply pump and filters system water, and system water operation washs after a period of time, and the cleaning process roughly divide into following step: (1) washing with gas and water: and introducing a small amount of backwash water and 1-2bar of compressed air to carry out gas-water washing on the ultrafiltration membrane. The contaminants on the surface of the membrane filaments are loosened by air scrubbing. (2) Water backwashing: and starting a backwashing pump, and introducing backwashing water with the water yield of 1.5 times to perform backwashing on the ultrafiltration membrane so as to flush away pollutants on the surface of the membrane. (3) Discharging: the contaminants of the membrane module are discharged under the action of gravity. (4) After running for several periods, the sodium hypochlorite with certain concentration is added in the water backwashing to eliminate the bacterial and microbial pollution of the membrane component.
The above process has many disadvantages: firstly, the washing step is loaded down with trivial details complicacy, needs gas washing, water backwash, discharges and sodium hypochlorite disappears and washes, has restricted system water efficiency to a certain extent, and secondly, there is the potential safety hazard in the introduction of sodium hypochlorite, and moreover, this processing method need be equipped with the backwash pump and carry out the backwash, need be equipped with medicine system to drop into sodium hypochlorite, so improved system equipment cost, improved the operation energy consumption, still need regularly supply the medicament simultaneously, it is higher to the transportation requirement.
Disclosure of Invention
The invention aims to provide a drinking water ultrafiltration system without medicine and unpowered backwashing, aiming at the technical defects of ultrafiltration water production in the prior art.
It is another object of the present invention to provide a method for operating the drinking water ultrafiltration system.
The technical scheme adopted for realizing the purpose of the invention is as follows:
the utility model provides a no medicine, drinking water ultrafiltration system of unpowered backwash, includes that the ultrafiltration is intake case, ozone generating device, ultrafiltration working shaft, first milipore filter unit, second milipore filter unit, ultrafiltration product water tank and air compressor machine, wherein:
the water outlet of the ultrafiltration water inlet tank is connected to the water inlet of the ultrafiltration water supply pump through an output pipeline, the ozone generating device is connected to the output pipeline through a pipeline, the water outlet of the ultrafiltration water supply pump is connected with a water supply pipeline, the water supply pipeline is communicated with the water inlet port of the first ultrafiltration membrane unit through a first branch, the water supply pipeline is communicated with the water inlet port of the second ultrafiltration membrane unit through a second branch, the water outlet port of each ultrafiltration membrane unit is connected to a water outlet pipeline through a water outlet branch, the water outlet pipeline is connected to the ultrafiltration water production tank, the air compressor is connected to the water inlet side of each ultrafiltration membrane unit through an air pipeline, the water outlet branches of the two ultrafiltration membrane units are connected to form a backwashing pipeline, and the concentrated water side and the water inlet side of each ultrafiltration membrane unit are provided with sewage discharge ports.
In the technical scheme, the concentrated water side of each ultrafiltration membrane unit is connected to the ultrafiltration water inlet tank through a concentrated water pipeline.
In the above technical scheme, a control valve is arranged on a pipeline between the ozone generating device and the output pipeline, and a pipeline mixer is arranged on a pipeline between the ozone generating device and the output pipeline.
In the technical scheme, the device further comprises a water inlet and outlet pipeline of the cartridge filter and the cartridge filter arranged on the water inlet and outlet pipeline of the cartridge filter, the water inlet and outlet pipeline of the cartridge filter is connected in parallel with a part of the water supply pipeline to form parallel pipelines, the bottom of the cartridge filter is provided with a drainage pipeline, and the drainage pipeline is provided with a discharge valve.
In the technical scheme, a water supply pipeline connected with the water inlet and outlet pipeline of the security filter in parallel is provided with a first manual valve, and the water inlet and outlet pipeline of the security filter is provided with a second manual valve.
In the above technical scheme, a third manual valve and a fourth manual valve are arranged on an output pipeline between the water outlet of the ultrafiltration water inlet tank and the water inlet of the ultrafiltration water supply pump, and the third manual valve and the fourth manual valve are respectively arranged on two sides of a pipeline for connecting the ozone generating device.
In the technical scheme, a check valve and a fifth manual valve are arranged on a water supply pipeline between the ultrafiltration water supply pump and the parallel pipelines.
In the above technical solution, the air compressor is connected to the water inlet side of the first ultrafiltration membrane unit through a first air pipeline, the air compressor is connected to the water inlet side of the second ultrafiltration membrane unit through a second air pipeline, an ultrafiltration UF01 air inlet valve is arranged on the first air pipeline, and an ultrafiltration UF02 air inlet valve is arranged on the second air pipeline;
the first ultrafiltration membrane unit consists of two ultrafiltration membrane filtering devices connected in parallel, an ultrafiltration UF01 membrane water inlet valve is arranged on the first branch, the first ultrafiltration membrane unit is connected to a water production pipeline through a first water production branch, an ultrafiltration UF01 water production valve is arranged on the first water production branch, an ultrafiltration total water production valve is arranged on the water production pipeline, and the water production pipeline is connected to an ultrafiltration water production tank;
the second ultrafiltration membrane unit consists of two ultrafiltration membrane filtering devices connected in parallel, an ultrafiltration UF02 water inlet valve is arranged on the second branch, the second ultrafiltration membrane unit is connected to a water production pipeline through a second water production branch, and an ultrafiltration UF02 water production valve is arranged on the second water production branch;
the first water production branch and the second water production branch form a backwashing pipeline for backwashing the first ultrafiltration membrane unit or the second ultrafiltration membrane unit;
the water inlet side of the first ultrafiltration membrane unit is connected with a first lower discharge pipeline, the first lower discharge pipeline is provided with an ultrafiltration UF01 lower discharge valve EV05, the concentrated water side of the first ultrafiltration membrane unit is connected with a first upper discharge pipeline, the first upper discharge pipeline is provided with an ultrafiltration UF01 upper discharge valve, the water inlet side of the second ultrafiltration membrane unit is connected with a second lower discharge pipeline, the second lower discharge pipeline is provided with an ultrafiltration UF02 lower discharge valve, the concentrated water side of the second ultrafiltration membrane unit is connected with a second upper discharge pipeline, and the second upper discharge pipeline is provided with an ultrafiltration UF02 upper discharge valve;
the concentrated water side of the first ultrafiltration membrane unit is further connected to the ultrafiltration water inlet tank through a first concentrated water pipeline, an ultrafiltration UF01 concentrated water valve is arranged on the first concentrated water pipeline, the concentrated water side of the second ultrafiltration membrane unit is further connected to the ultrafiltration water inlet tank through a second concentrated water pipeline, and an ultrafiltration UF02 concentrated water valve is arranged on the second concentrated water pipeline.
In another aspect of the present invention, the method for operating the drinking water ultrafiltration system comprises the steps of:
water preparation: the underground water enters the ultrafiltration water inlet tank, under the action of the ultrafiltration water supply pump, the water in the ultrafiltration water inlet tank enters the first ultrafiltration membrane unit and/or the second ultrafiltration membrane unit for ultrafiltration, and enters the ultrafiltration water production tank through the water outlet port of the ultrafiltration membrane unit; meanwhile, starting an ozone generating device, enabling ozone and water to enter an ultrafiltration membrane unit for killing, and controlling bacteria and microorganisms on the surface of the membrane;
and (3) cleaning the first ultrafiltration membrane unit:
step 1, air washing step: starting an air compressor, enabling air to enter the first ultrafiltration membrane unit through an air pipeline and a water inlet side, and opening a drain outlet on a concentrated water side to drain;
step 3, stopping the machine for soaking, continuing to perform gas washing and water backwashing and pollution discharge in the steps 1 and 2 after pollutants are accumulated on the surface of the loose and soft membrane, and then recovering water;
if the sewage is not completely discharged in the process of recovering the water production by the first ultrafiltration membrane unit, returning the sewage to the ultrafiltration water inlet tank through a concentrated water pipeline connected to the first ultrafiltration membrane unit so as to slow down membrane pollution;
the cleaning step of the second ultrafiltration membrane unit is the same as that of the first ultrafiltration membrane unit.
10. The method of operating a drinking water ultrafiltration system according to claim 8, comprising the steps of:
when the first ultrafiltration membrane unit produces water: opening an ultrafiltration UF01 membrane water inlet valve, an ultrafiltration UF01 water production valve, an ultrafiltration total water production valve and an ultrafiltration water supply pump, starting raw water, entering a first ultrafiltration membrane unit under the pressure drive of the ultrafiltration water supply pump, and starting water production; preferably, when the quality of raw water is poor, an ultrafiltration UF01 concentrated water valve is opened at the same time, part of water enters a first ultrafiltration membrane unit for filtration, and part of water returns to the ultrafiltration water inlet tank to form cross flow to slow down membrane pollution;
when the first ultrafiltration membrane unit is cleaned, air washing, water backwashing and soaking are sequentially carried out:
during air washing, the air compressor 7 is started, the upper discharge valve of the ultrafiltration UF01 and the air inlet valve of the ultrafiltration UF01 are opened, and air washing is carried out;
when water is backwashed, an ultrafiltration UF02 water inlet valve, an ultrafiltration UF02 water production valve, an ultrafiltration UF01 water production valve and an ultrafiltration UF01 upper discharge valve are opened, an ultrafiltration UF01 lower discharge valve is opened, the first ultrafiltration membrane unit is reversely washed through high-yield water of the second ultrafiltration membrane unit, membrane surface pollutants of the first ultrafiltration membrane unit are washed away, the pollutants pass through an ultrafiltration UF01 upper discharge valve and an ultrafiltration UF01 lower discharge valve, and sewage is discharged through gravity; when the sewage discharged by gravity cannot be completely discharged, opening an ultrafiltration UF01 water inlet valve and an ultrafiltration UF01 concentrated water valve, and flushing water into an ultrafiltration water inlet tank;
during soaking, when the first ultrafiltration membrane unit finishes the physical backwashing process, stopping soaking to accumulate pollutants on the surface of the soft membrane, and then performing water backwashing and gravity pollution discharge to recover the membrane flux;
when the second ultrafiltration membrane unit produces water: opening an ultrafiltration UF02 water inlet valve, an ultrafiltration UF02 water production valve and an ultrafiltration total water production valve, opening an ozone generating device and an ultrafiltration water supply pump, allowing raw water mixed with ozone to enter a second ultrafiltration membrane unit under the pressure drive of the ultrafiltration water supply pump, and starting to produce water, wherein preferably, when the quality of the raw water is poor, an ultrafiltration UF02 concentrated water valve can be opened at the same time, part of water enters the second ultrafiltration membrane unit for filtration, and part of water returns to an ultrafiltration water inlet tank to form cross flow to reduce membrane pollution;
and when the second ultrafiltration membrane unit is cleaned, sequentially carrying out air washing, water backwashing and soaking:
when the water is washed by air, the air compressor is started, and an ultrafiltration UF02 upper discharge valve and an ultrafiltration UF02 air inlet valve are opened;
when water is backwashed, an ultrafiltration UF01 membrane water inlet valve, an ultrafiltration UF01 water production valve, an ultrafiltration UF02 water production valve and an ultrafiltration UF02 upper discharge valve are opened, an ultrafiltration UF02 lower discharge valve is opened, the second ultrafiltration membrane unit is subjected to reverse washing through high-yield water of the first ultrafiltration membrane unit, membrane surface pollutants of the second ultrafiltration membrane unit are washed away, and the pollutants pass through an ultrafiltration UF02 upper discharge valve and an ultrafiltration UF02 lower discharge valve to discharge sewage through gravity; when the sewage discharged by gravity cannot be completely discharged, opening an ultrafiltration UF02 water inlet valve and an ultrafiltration UF02 concentrated water valve, and flushing water into an ultrafiltration water inlet tank;
when the second ultrafiltration membrane unit finishes the physical backwashing process during soaking, the machine is stopped for soaking, pollutants are accumulated on the surface of the soft membrane, and then water backwashing and gravity pollution discharge are carried out to recover the membrane flux.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention cancels a backwashing pump, is provided with two switchable ultrafiltration membrane units, and realizes the recovery of membrane flux by backwashing the two ultrafiltration membrane units mutually to remove the pollution of suspended matters and colloid to the membrane. The two switchable ultrafiltration membrane units run simultaneously or one ultrafiltration membrane unit is used for standby, so that the water production efficiency of the system is improved, and in addition, backwashing equipment is omitted, so that the system cost is reduced.
2. According to the invention, the pollution of bacteria and microorganisms to the membrane surface is controlled by filling ozone into the water, a dosing device is omitted, the introduction of sodium hypochlorite is avoided, the simplification and the stability of ultrafiltration water supply operation and no chemical change of water supply are realized, and the safety of drinking water is ensured.
3. Ozone is continuously introduced in the water making process, so that bacteria and microorganisms are prevented from being bred on the ultrafiltration membrane unit, and the cleanliness of water making is improved.
Drawings
Fig. 1 is a schematic structural diagram of the drinking water ultrafiltration system of the present invention.
In the figure:
1-an ultrafiltration water inlet tank, 2-an ozone generating device, 3-an ultrafiltration water supply pump, 4-a first ultrafiltration membrane unit, 5-a second ultrafiltration membrane unit, 6-an ultrafiltration water production tank, 7-an air compressor, 8-an output pipeline, 9-a water supply pipeline, 10-a first branch, 11-a second branch, 12-a security filter water inlet and outlet pipeline, 13-a first air pipeline, 14-a second air pipeline, 15-a first water production branch, 16-a water production pipeline, 17-a second water production branch, 18-a first lower discharge pipeline, 19-a first upper discharge pipeline, 20-a second lower discharge pipeline, 21-a second upper discharge pipeline, 22-a first concentrated water pipeline and 23-a second concentrated water pipeline.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The utility model provides a no medicine, drinking water ultrafiltration system of unpowered backwash, includes that the ultrafiltration is intake case 1, ozone generating device 2, ultrafiltration working shaft 3, first milipore filter unit 4, second milipore filter unit 5, the ultrafiltration product water tank 6 and air compressor machine 7, wherein:
the water outlet of the ultrafiltration water inlet tank 1 is connected to the water inlet of the ultrafiltration water supply pump 3 through an output pipeline 8, the ozone generating device 2 is connected to the output pipeline 8 through a pipeline, the water outlet of the ultrafiltration water supply pump 3 is connected with a water supply pipeline 9, the water supply pipeline 9 is communicated with the water inlet port of the first ultrafiltration membrane unit 4 through a first branch 10, the water supply pipeline 9 is communicated with the water inlet port of the second ultrafiltration membrane unit 5 through a second branch 11, the water outlet port of each ultrafiltration membrane unit is connected to a water outlet pipeline through a water outlet branch, the water outlet pipeline is connected to the ultrafiltration water production tank 6, the air compressor 7 is connected to the water inlet side of each ultrafiltration membrane unit through an air pipeline, the water outlet branches of the two ultrafiltration membrane units are connected to form a backwashing pipeline, and the concentrated water side and the water inlet side of each ultrafiltration membrane unit are both provided with sewage discharge ports, the concentrated water side of each ultrafiltration membrane unit is connected to the ultrafiltration water inlet tank 1 through a concentrated water pipeline.
The operation method of the drinking water ultrafiltration system comprises the following steps:
water preparation: the underground water enters the ultrafiltration water inlet tank 1, under the action of the ultrafiltration water supply pump 3, the water in the ultrafiltration water inlet tank 1 enters the first ultrafiltration membrane unit 4 and/or the second ultrafiltration membrane unit 5 for ultrafiltration, and enters the ultrafiltration water production tank 6 through the water outlet port of the ultrafiltration membrane unit; meanwhile, starting the ozone generating device 2, and enabling ozone and water to enter the ultrafiltration membrane unit for killing and killing to control bacteria and microorganisms on the membrane surface; in the process of making water, ozone generating device simultaneous operation, ozone stops letting in when making water stops, so disappears at any time and kills, washs for traditional sodium hypochlorite, and the cleanliness factor has further promotion, has avoided breeding of bacterium and microorganism, has also avoided the medicine to remain simultaneously.
And (3) cleaning the first ultrafiltration membrane unit 4:
step 1, air washing step: starting an air compressor 7, enabling air to enter the first ultrafiltration membrane unit 4 through an air pipeline and a water inlet side, and opening a drain outlet on a concentrated water side to drain;
and 3, stopping the machine for soaking, continuing water backwashing and pollution discharge in the step 2 after pollutants are accumulated on the surface of the soft membrane, and then recovering the membrane flux.
When the sewage discharged by gravity cannot be completely discharged, the water inlet valve of the ultrafiltration UF01 and the concentrated water valve of the ultrafiltration UF01 are opened, and water is flushed into the ultrafiltration water inlet tank to slow down membrane pollution.
The cleaning step of the second ultrafiltration membrane unit 5 is the same as that of the first ultrafiltration membrane unit 4.
Preferably, a pipeline mixer is arranged on a pipeline between the ozone generating device 2 and the output pipeline 8, so that the mixing uniformity of ozone and water is further improved, and the killing effect is optimized. In order to prolong the service life of the first ultrafiltration membrane unit 4 and the second ultrafiltration membrane unit 5, the ultrafiltration membranes of the first ultrafiltration membrane unit 4 and the second ultrafiltration membrane unit 5 are ozone-resistant membranes. The oxygen production amount of the ozone generating device 2 is matched with the water production amount to control, when the water production amount is large, the oxygen production amount of the ozone generating device 2 is improved, and when the water production amount is small, the oxygen production amount of the ozone generating device 2 is reduced.
Example 2
The drinking water ultrafiltration system without dosing and unpowered backwashing also comprises a cartridge filter water inlet and outlet pipeline and a cartridge filter arranged on the cartridge filter water inlet and outlet pipeline, wherein the cartridge filter water inlet and outlet pipeline 12 is connected in parallel on part of the water supply pipeline 9 to form parallel pipelines, the bottom of the cartridge filter is provided with a drainage pipeline, and the drainage pipeline is provided with a DN50 discharge valve. The cartridge filter is used for preventing the membrane wires from being damaged by large-particle impurities.
Preferably, a first manual valve V07 is disposed on the water supply pipeline 9 connected in parallel with the cartridge filter water inlet and outlet pipeline 12, a second manual valve V08 is disposed on the cartridge filter water inlet and outlet pipeline 12, when the first manual valve V07 is opened and the second manual valve V08 is closed, the water pumped by the ultrafiltration water supply pump 3 directly enters the first ultrafiltration membrane unit 4 and/or the second ultrafiltration membrane unit 5, and when the second manual valve V08 is opened and the first manual valve V07 is closed, the water pumped by the ultrafiltration water supply pump 3 is filtered by the cartridge filter and then enters the first ultrafiltration membrane unit 4 and/or the second ultrafiltration membrane unit 5.
And a third manual valve V01 and a fourth manual valve V04 are arranged on an output pipeline 8 between the water outlet of the ultrafiltration water inlet tank 1 and the water inlet of the ultrafiltration water supply pump 3. The maintenance of the ultrafiltration water inlet tank 1 rear equipment and the maintenance of the ultrafiltration water supply pump 3 are facilitated.
A check valve CV02 and a fifth manual valve V06 are arranged on a water supply pipeline 9 between the ultrafiltration water supply pump 3 and the parallel pipelines. Check valve CV02 is used for preventing the water refluence, and the setting of fifth manual valve V06 is easy to overhaul.
A control valve is arranged on a pipeline between the ozone generating device 2 and the output pipeline 8 to control the ozone to enter the ultrafiltration system.
Preferably, the air compressor 7 is connected to the water inlet side of the first ultrafiltration membrane unit 4 through a first air pipeline 13, and is connected to the water inlet side of the second ultrafiltration membrane unit 5 through a second air pipeline 14, an ultrafiltration UF01 air inlet valve EV06 is arranged on the first air pipeline 13, and an ultrafiltration UF02 air inlet valve EV12 is arranged on the second air pipeline 14.
The first ultrafiltration membrane unit 4 consists of two ultrafiltration membrane filtering devices connected in parallel, an ultrafiltration UF01 membrane water inlet valve EV01 is arranged on the first branch 10, the first ultrafiltration membrane unit 4 is connected to a water production pipeline 16 through a first water production branch 15, an ultrafiltration UF01 water production valve EV03 is arranged on the first water production branch 15, an ultrafiltration total water production valve EV13 is arranged on the water production pipeline 16, and the water production pipeline 16 is connected to the ultrafiltration water production tank 6;
the second ultrafiltration membrane unit 5 is composed of two ultrafiltration membrane filtering devices connected in parallel, an ultrafiltration UF02 water inlet valve EV07 is arranged on the second branch 11, the second ultrafiltration membrane unit 5 is connected to a water production pipeline 16 through a second water production branch 17, and an ultrafiltration UF02 water production valve EV09 is arranged on the second water production branch 17.
The first water production branch 15 and the second water production branch 17 form a backwashing pipeline for backwashing the first ultrafiltration membrane unit 4 or the second ultrafiltration membrane unit 5.
The water inlet side of the first ultrafiltration membrane unit 4 is connected with a first lower discharge pipeline 18, the first lower discharge pipeline 18 is provided with an ultrafiltration UF01 lower discharge valve EV05, the concentrated water side of the first ultrafiltration membrane unit 4 is connected with a first upper discharge pipeline 19, the first upper discharge pipeline 19 is provided with an ultrafiltration UF01 upper discharge valve EV04, the water inlet side of the second ultrafiltration membrane unit 5 is connected with a second lower discharge pipeline 20, the second lower discharge pipeline 20 is provided with an ultrafiltration UF02 lower discharge valve EV11, the concentrated water side of the second ultrafiltration membrane unit 5 is connected with a second upper discharge pipeline 21, and the second upper discharge pipeline 21 is provided with an ultrafiltration UF02 upper discharge valve EV 10;
the concentrated water side of the first ultrafiltration membrane unit 4 is also connected to the ultrafiltration water inlet tank 1 through a first concentrated water pipeline 22, an ultrafiltration UF01 concentrated water valve EV02 is arranged on the first concentrated water pipeline 22, the concentrated water side of the second ultrafiltration membrane unit 5 is also connected to the ultrafiltration water inlet tank 1 through a second concentrated water pipeline 23, and an ultrafiltration UF02 concentrated water valve EV08 is arranged on the second concentrated water pipeline 23;
example 3
Method for operating a drinking water ultrafiltration system according to example 2:
when the first ultrafiltration membrane unit 4 produces water: and opening an ultrafiltration UF01 membrane water inlet valve EV01, an ultrafiltration UF01 water production valve EV03 and an ultrafiltration total water production valve EV13, and starting an ozone generating device 2 and an ultrafiltration water supply pump 3. The raw water mixed with ozone enters the first ultrafiltration membrane unit 4 under the pressure drive of the ultrafiltration water supply pump 3 to start water production, when the quality of the raw water is poor, an ultrafiltration UF01 concentrated water valve EV02 can be opened simultaneously, part of water enters the first ultrafiltration membrane unit 4 to be filtered, and part of water returns to the ultrafiltration water inlet tank 1 to form cross flow to slow down membrane pollution.
When the first ultrafiltration membrane unit 4 is cleaned, gas washing, water backwashing and soaking are sequentially carried out:
during air washing, the air compressor 7 is started, the upper exhaust valve EV04 of the ultrafiltration UF01 and the air inlet valve EV06 of the ultrafiltration UF01 are opened, and air washing is carried out.
During water backwashing, an ultrafiltration UF02 water inlet valve EV07, an ultrafiltration UF02 water outlet valve EV09, an ultrafiltration UF01 water outlet valve EV03 and an ultrafiltration UF01 upper discharge valve EV04 are opened, an ultrafiltration UF01 lower discharge valve EV05 is opened, the first ultrafiltration membrane unit 4 is subjected to back washing through high-yield water of the second ultrafiltration membrane unit 5, membrane surface pollutants of the first ultrafiltration membrane unit 4 are washed away, the pollutants pass through an ultrafiltration UF01 upper discharge valve EV04 and an ultrafiltration UF01 lower discharge valve EV05, and sewage is discharged through gravity.
When the sewage discharged by gravity cannot be discharged completely, an ultrafiltration UF01 water inlet valve EV01 and an ultrafiltration UF01 concentrate valve EV02 are opened, and water is flushed into an ultrafiltration water inlet tank to slow down membrane pollution.
Soaking: when the first ultrafiltration membrane unit 4 finishes the physical backwashing process, the machine is stopped for soaking, pollutants are accumulated on the surface of the soft membrane, then the water backwashing and the gravity pollution discharge are carried out, and the membrane flux is recovered to start water production.
When the second ultrafiltration membrane unit 5 produces water: and opening an ultrafiltration UF02 water inlet valve EV07, an ultrafiltration UF02 water production valve EV09 and an ultrafiltration total water production valve EV13, and starting the ozone generating device 2 and the ultrafiltration water supply pump 3. The raw water mixed with ozone enters the second ultrafiltration membrane unit 5 under the pressure drive of the ultrafiltration water supply pump 3 to start water production. When the quality of raw water is poor, an ultrafiltration UF02 concentrated water valve EV08 can be opened at the same time, part of water enters a second ultrafiltration membrane unit 5 for filtration, and part of water returns to the ultrafiltration water inlet tank 1 to form cross flow to slow down membrane pollution.
When the second ultrafiltration membrane unit 5 is cleaned, air washing, water backwashing and soaking are sequentially carried out:
during water gas washing, the air compressor 7 is started, and the upper exhaust valve EV10 and the ultrafiltration UF02 air inlet valve EV12 of the ultrafiltration UF02 are opened.
During water backwashing, an ultrafiltration UF01 membrane water inlet valve EV01, an ultrafiltration UF01 water outlet valve EV03, an ultrafiltration UF02 water outlet valve EV09 and an ultrafiltration UF02 upper discharge valve EV10 are opened, an ultrafiltration UF02 lower discharge valve EV11 is opened, the second ultrafiltration membrane unit 5 is back-washed through high-yield water of the first ultrafiltration membrane unit 4, membrane surface pollutants of the second ultrafiltration membrane unit 5 are washed away, the pollutants pass through an ultrafiltration UF02 upper discharge valve EV10 and an ultrafiltration UF02 lower discharge valve EV11, and sewage is discharged through gravity.
When the sewage discharged by gravity cannot be discharged completely, an ultrafiltration UF02 water inlet valve EV07 and an ultrafiltration UF02 concentrate valve EV08 are opened, and water is flushed into an ultrafiltration water inlet tank to slow down membrane pollution.
When the second ultrafiltration membrane unit 5 finishes the physical backwashing process during soaking, the machine is stopped for soaking, so that pollutants are accumulated on the surface of the soft membrane, and water backwashing and gravity pollution discharge are carried out to recover the membrane flux.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a do not have medicine, drinking water ultrafiltration system of unpowered backwash which characterized in that, including the ultrafiltration intake box, ozone generating device, ultrafiltration working shaft, first milipore filter unit, second milipore filter unit, ultrafiltration product water tank and air compressor machine, wherein:
the water outlet of the ultrafiltration water inlet tank is connected to the water inlet of the ultrafiltration water supply pump through an output pipeline, the ozone generating device is connected to the output pipeline through a pipeline, the water outlet of the ultrafiltration water supply pump is connected with a water supply pipeline, the water supply pipeline is communicated with the water inlet port of the first ultrafiltration membrane unit through a first branch, the water supply pipeline is communicated with the water inlet port of the second ultrafiltration membrane unit through a second branch, the water outlet port of each ultrafiltration membrane unit is connected to a water outlet pipeline through a water outlet branch, the water outlet pipeline is connected to the ultrafiltration water production tank, the air compressor is connected to the water inlet side of each ultrafiltration membrane unit through an air pipeline, the water outlet branches of the two ultrafiltration membrane units are connected to form a backwashing pipeline, and the concentrated water side and the water inlet side of each ultrafiltration membrane unit are provided with sewage discharge ports.
2. The drugless, unpowered backwash potable water ultrafiltration system of claim 1, wherein the concentrate side of each ultrafiltration membrane unit is connected to the ultrafiltration inlet tank by a concentrate line.
3. The drugless, unpowered backwash drinking water ultrafiltration system as recited in claim 1 wherein a control valve is provided on a pipeline between the ozone generating device and the output pipeline, and a pipeline mixer is provided on a pipeline between the ozone generating device and the output pipeline.
4. The drinking water ultrafiltration system with no chemical and no power backwash as claimed in claim 1, further comprising a cartridge filter inlet and outlet pipeline and a cartridge filter arranged on the cartridge filter inlet and outlet pipeline, wherein the cartridge filter inlet and outlet pipeline is connected in parallel with part of the water supply pipeline to form parallel pipelines, a drain pipeline is arranged at the bottom of the cartridge filter, and a drain valve is arranged on the drain pipeline.
5. The drugless, unpowered backwash drinking water ultrafiltration system as claimed in claim 4 wherein a first manual valve is provided on a water supply line connected in parallel with the cartridge filter water inlet and outlet line, and a second manual valve is provided on the cartridge filter water inlet and outlet line.
6. The drugless, unpowered backwash drinking water ultrafiltration system as recited in claim 1, wherein a third manual valve and a fourth manual valve are provided on an output pipe between a water outlet of the ultrafiltration water inlet tank and a water inlet of the ultrafiltration water supply pump, and the third manual valve and the fourth manual valve are respectively provided on both sides of a pipe for connecting the ozone generating device.
7. The drugless, unpowered backwash drinking water ultrafiltration system as claimed in claim 4 wherein a check valve and a fifth manual valve are provided on a water supply line between the ultrafiltration water supply pump and the parallel line.
8. The drugless, unpowered backwashing drinking water ultrafiltration system of claim 1, wherein the air compressor is connected to a water inlet side of the first ultrafiltration membrane unit through a first air line, the air compressor is connected to a water inlet side of the second ultrafiltration membrane unit through a second air line, an ultrafiltration UF01 air inlet valve is arranged on the first air line, and an ultrafiltration UF02 air inlet valve is arranged on the second air line;
the first ultrafiltration membrane unit consists of two ultrafiltration membrane filtering devices connected in parallel, an ultrafiltration UF01 membrane water inlet valve is arranged on the first branch, the first ultrafiltration membrane unit is connected to a water production pipeline through a first water production branch, an ultrafiltration UF01 water production valve is arranged on the first water production branch, an ultrafiltration total water production valve is arranged on the water production pipeline, and the water production pipeline is connected to an ultrafiltration water production tank;
the second ultrafiltration membrane unit consists of two ultrafiltration membrane filtering devices connected in parallel, an ultrafiltration UF02 water inlet valve is arranged on the second branch, the second ultrafiltration membrane unit is connected to a water production pipeline through a second water production branch, and an ultrafiltration UF02 water production valve is arranged on the second water production branch;
the first water production branch and the second water production branch form a backwashing pipeline for backwashing the first ultrafiltration membrane unit or the second ultrafiltration membrane unit;
the water inlet side of the first ultrafiltration membrane unit is connected with a first lower discharge pipeline, the first lower discharge pipeline is provided with an ultrafiltration UF01 lower discharge valve EV05, the concentrated water side of the first ultrafiltration membrane unit is connected with a first upper discharge pipeline, the first upper discharge pipeline is provided with an ultrafiltration UF01 upper discharge valve, the water inlet side of the second ultrafiltration membrane unit is connected with a second lower discharge pipeline, the second lower discharge pipeline is provided with an ultrafiltration UF02 lower discharge valve, the concentrated water side of the second ultrafiltration membrane unit is connected with a second upper discharge pipeline, and the second upper discharge pipeline is provided with an ultrafiltration UF02 upper discharge valve;
the concentrated water side of the first ultrafiltration membrane unit is further connected to the ultrafiltration water inlet tank through a first concentrated water pipeline, an ultrafiltration UF01 concentrated water valve is arranged on the first concentrated water pipeline, the concentrated water side of the second ultrafiltration membrane unit is further connected to the ultrafiltration water inlet tank through a second concentrated water pipeline, and an ultrafiltration UF02 concentrated water valve is arranged on the second concentrated water pipeline.
9. Method for operating a drinking water ultrafiltration system according to any of claims 1 to 8, comprising the steps of:
water preparation: the underground water enters the ultrafiltration water inlet tank, under the action of the ultrafiltration water supply pump, the water in the ultrafiltration water inlet tank enters the first ultrafiltration membrane unit and/or the second ultrafiltration membrane unit for ultrafiltration, and enters the ultrafiltration water production tank through the water outlet port of the ultrafiltration membrane unit; meanwhile, starting an ozone generating device, enabling ozone and water to enter an ultrafiltration membrane unit for killing, and controlling bacteria and microorganisms on the surface of the membrane;
the first ultrafiltration membrane unit is cleaned:
step 1, air washing step: starting an air compressor, enabling air to enter the first ultrafiltration membrane unit through an air pipeline and a water inlet side, and opening a drain outlet on a concentrated water side to drain;
step 2, water backwashing: water generated by the second ultrafiltration membrane unit enters the first ultrafiltration membrane unit through a backwashing pipeline, pollutants on the membrane surface of the first ultrafiltration membrane unit are washed away, and sewage is discharged through sewage outlets on the concentrated water side and the water inlet side of the first ultrafiltration membrane unit;
step 3, stopping the machine for soaking, continuing to perform gas washing and water backwashing and pollution discharge in the steps 1 and 2 after pollutants are accumulated on the surface of the loose and soft membrane, and then recovering water;
preferably, if the sewage is not completely discharged in the process of recovering the water production by the first ultrafiltration membrane unit, the sewage returns to the ultrafiltration water inlet tank through a concentrated water pipeline connected to the first ultrafiltration membrane unit so as to slow down membrane pollution;
the step of cleaning the second ultrafiltration membrane unit is the same as the step of cleaning the first ultrafiltration membrane unit.
10. The method of operating a drinking water ultrafiltration system according to claim 8, comprising the steps of:
when the first ultrafiltration membrane unit produces water: opening an ultrafiltration UF01 membrane water inlet valve, an ultrafiltration UF01 water production valve, an ultrafiltration total water production valve and an ultrafiltration water supply pump, starting raw water, entering a first ultrafiltration membrane unit under the pressure drive of the ultrafiltration water supply pump, and starting water production; preferably, when the quality of raw water is poor, an ultrafiltration UF01 concentrated water valve is opened at the same time, part of water enters a first ultrafiltration membrane unit for filtration, and part of water returns to the ultrafiltration water inlet tank to form cross flow to slow down membrane pollution;
when the first ultrafiltration membrane unit is cleaned, gas washing, water backwashing and soaking are sequentially carried out:
during air washing, starting an air compressor, opening an ultrafiltration UF01 upper discharge valve and an ultrafiltration UF01 air inlet valve, and carrying out air washing;
when water is backwashed, an ultrafiltration UF02 water inlet valve, an ultrafiltration UF02 water production valve, an ultrafiltration UF01 water production valve and an ultrafiltration UF01 upper discharge valve are opened, an ultrafiltration UF01 lower discharge valve is opened, the first ultrafiltration membrane unit is reversely washed through high-yield water of the second ultrafiltration membrane unit, membrane surface pollutants of the first ultrafiltration membrane unit are washed away, the pollutants pass through an ultrafiltration UF01 upper discharge valve and an ultrafiltration UF01 lower discharge valve, and sewage is discharged through gravity; when the sewage discharged by gravity cannot be completely discharged, opening an ultrafiltration UF01 water inlet valve and an ultrafiltration UF01 concentrated water valve, and flushing water into an ultrafiltration water inlet tank;
during soaking, when the first ultrafiltration membrane unit finishes the physical backwashing process, stopping soaking to accumulate pollutants on the surface of the soft membrane, and then performing water backwashing and gravity pollution discharge to recover the membrane flux;
when the second ultrafiltration membrane unit produces water: opening an ultrafiltration UF02 water inlet valve, an ultrafiltration UF02 water production valve and an ultrafiltration total water production valve, opening an ozone generating device and an ultrafiltration water supply pump, and allowing raw water mixed with ozone to enter a second ultrafiltration membrane unit under the pressure drive of the ultrafiltration water supply pump to start water production; preferably, when the quality of raw water is poor, an ultrafiltration UF02 concentrated water valve can be opened at the same time, part of water enters a second ultrafiltration membrane unit for filtration, and part of water returns to the ultrafiltration water inlet tank to form cross flow to slow down membrane pollution;
and when the second ultrafiltration membrane unit is cleaned, sequentially carrying out air washing, water backwashing and soaking:
when the water is washed by air, the air compressor is started, and an ultrafiltration UF02 upper discharge valve and an ultrafiltration UF02 air inlet valve are opened;
when water is backwashed, an ultrafiltration UF01 membrane water inlet valve, an ultrafiltration UF01 water production valve, an ultrafiltration UF02 water production valve and an ultrafiltration UF02 upper discharge valve are opened, an ultrafiltration UF02 lower discharge valve is opened, the second ultrafiltration membrane unit is subjected to reverse washing through high-yield water of the first ultrafiltration membrane unit, membrane surface pollutants of the second ultrafiltration membrane unit are washed away, and the pollutants pass through an ultrafiltration UF02 upper discharge valve and an ultrafiltration UF02 lower discharge valve to discharge sewage through gravity; when the sewage discharged by gravity cannot be completely discharged, opening an ultrafiltration UF02 water inlet valve and an ultrafiltration UF02 concentrated water valve, and flushing water into an ultrafiltration water inlet tank;
when the second ultrafiltration membrane unit finishes the physical backwashing process during soaking, the machine is stopped for soaking, so that pollutants are accumulated on the surface of the soft membrane, and then water backwashing and gravity pollution discharge are carried out to recover the membrane flux.
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Cited By (1)
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