CN114573076A - Drinking water ultrafiltration system without chemical adding and unpowered backwashing and operation method - Google Patents

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

A drinking water ultrafiltration system and operation method with no dosing and no power backwashing

technical field

The invention relates to the technical field of drinking water produced by ultrafiltration, in particular to a drinking water ultrafiltration system and an operation method with no dosing and no power backwashing.

Background technique

When groundwater is used as water supply source, 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 backwash pump, an air compressor, etc. to eliminate suspended solids and colloids by physical methods such as air-water washing and water backwashing. In view of the pollution of bacteria and microorganisms to the ultrafiltration membrane, the main purpose is to set up a dosing device and add a certain concentration of sodium hypochlorite to remove it through backwashing, so as to achieve the purpose of restoring the membrane flux.

When producing water by ultrafiltration in the prior art, the raw water, driven by the pressure of the water supply pump, enters the membrane module for filtration and water production, and is cleaned after the water production runs for a period of time. The cleaning process is roughly divided into the following steps: (1) Gas water washing: Add a small amount of backwash water and 1-2bar compressed air to wash the ultrafiltration membrane with air and water. Loosen contaminants on the membrane surface by air scrubbing. (2) Water backwashing: start the backwashing pump, and pass backwash water with 1.5 times the production water volume to backwash the ultrafiltration membrane to flush out the pollutants on the membrane surface. (3) Discharge: The pollutants of the membrane module are discharged under the action of gravity. (4) After running for several cycles, add a certain concentration of sodium hypochlorite to the water backwash to eliminate bacterial and microbial contamination of the membrane module.

The above process methods have many shortcomings: first, the cleaning steps are cumbersome and complex, requiring air washing, water backwashing, discharge and sodium hypochlorite cleaning, which limits the water production efficiency to a certain extent; secondly, the introduction of sodium hypochlorite has potential safety hazards, and further, this The process method needs to be equipped with a backwash pump for backwashing, and a dosing system to input sodium hypochlorite, which increases the cost of system equipment and increases the operating energy consumption.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a drinking water ultrafiltration system with no dosing and no power backwashing in view of the technical defects existing in the ultrafiltration water production in the prior art.

Another object of the present invention is to provide a method of operating the drinking water ultrafiltration system.

The technical scheme adopted for realizing the purpose of the present invention is:

A drinking water ultrafiltration system with no dosing and no power backwashing, including an ultrafiltration water inlet tank, an ozone generator, an ultrafiltration water supply pump, a first ultrafiltration membrane unit, a second ultrafiltration membrane unit, an ultrafiltration production Water tank and air compressor, including:

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, and the outlet of the ultrafiltration water supply pump is connected. The water port is connected to 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, and the water supply pipeline is connected to the second ultrafiltration membrane through a second branch The water inlet ports of the units are connected, the water outlet port of each ultrafiltration membrane unit is connected to the water outlet pipeline through the water outlet branch, and the water outlet pipeline is connected to the ultrafiltration water production tank, and the air compressors are respectively connected through the air pipes. The circuit is connected to the water inlet side of each ultrafiltration membrane unit, the water outlet branches of the two ultrafiltration membrane units are connected to form a backwash pipeline, and each ultrafiltration membrane unit is provided with a sewage outlet on the concentrated water side and the water inlet side .

In the above technical solution, 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 solution, a control valve is provided on the pipeline between the ozone generating device and the output pipeline, and a pipeline mixer is provided on the pipeline between the ozone generating device and the output pipeline.

In the above-mentioned technical scheme, it also includes the security filter inlet and outlet pipelines and the security filter arranged on the security filter inlet and outlet pipelines, the security filter inlet and outlet pipelines are connected in parallel with some of the water supply pipelines to form parallel pipelines, A drainage pipeline is arranged at the bottom of the security filter, and a discharge valve is arranged on the drainage pipeline.

In the above technical solution, a first manual valve is provided on the water supply pipeline connected in parallel with the water inlet and outlet pipelines of the security filter, and a second manual valve is provided on the water inlet and outlet pipelines of the security filter.

In the above technical scheme, the output pipeline between the water outlet of the ultrafiltration water inlet tank and the water inlet of the ultrafiltration water supply pump is provided with a third manual valve and a fourth manual valve. Four manual valves are respectively arranged on both sides of the pipeline for connecting the ozone generating device.

In the above technical solution, a check valve and a fifth manual valve are provided on the water supply pipeline between the ultrafiltration water supply pump and the parallel pipeline.

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, and the air compressor is connected to the second ultrafiltration membrane through a second air pipeline. On the water inlet side of the membrane filter unit, an ultrafiltration UF01 intake valve is arranged on the first air pipeline, and an ultrafiltration UF02 intake valve is arranged on the second air pipeline;

The first ultrafiltration membrane unit is composed of two parallel ultrafiltration membrane filtration devices, the first branch is provided with an ultrafiltration UF01 membrane water inlet valve, and the first ultrafiltration membrane unit passes through the first water production branch. connected to the water production pipeline, the first water production branch is provided with an ultrafiltration UF01 water production valve, the water production pipeline is provided with an ultrafiltration main water production valve, and the water production pipeline is connected to the ultrafiltration product water tank;

The second ultrafiltration membrane unit is composed of two parallel ultrafiltration membrane filtration devices, the second branch is provided with an ultrafiltration UF02 water inlet valve, and the second ultrafiltration membrane unit passes through the second water production branch. It is connected to the water production pipeline, and the second water production branch is provided with an ultrafiltration UF02 water production valve;

The first water production branch and the second water production branch constitute a backwash 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, and an ultrafiltration UF01 lower discharge valve EV05 is arranged on the first lower discharge pipeline, and the concentrated water of the first ultrafiltration membrane unit is The side is connected with a first upper discharge pipeline, an ultrafiltration UF01 upper discharge valve is arranged on the first upper discharge pipeline, and a second lower discharge pipeline is connected to the water inlet side of the second ultrafiltration membrane unit. 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 exhaust valve;

The concentrated water side of the first ultrafiltration membrane unit is also connected to the ultrafiltration water inlet tank through the first concentrated water pipeline, and the first concentrated water pipeline is provided with an ultrafiltration UF01 concentrated water valve, and the second ultrafiltration The concentrated water side of the filter membrane unit is also 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 operation method of the drinking water ultrafiltration system comprises the following steps:

Water production step: groundwater enters the ultrafiltration water inlet tank, and 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. , enter the ultrafiltration water production tank through the water outlet port of the ultrafiltration membrane unit; at the same time, start the ozone generator, and the ozone and water enter the ultrafiltration membrane unit for disinfection, controlling the bacteria and microorganisms on the membrane surface;

The steps of cleaning the first ultrafiltration membrane unit:

Step 1, air washing step: start the air compressor, the air enters the first ultrafiltration membrane unit through the air pipeline and the water inlet side, and the sewage outlet on the concentrated water side is opened for sewage discharge;

Step 2, water backwashing step: the water generated by the second ultrafiltration membrane unit enters the first ultrafiltration membrane unit through the backwashing pipeline, and after flushing the membrane surface pollutants of the first ultrafiltration membrane unit, the sewage passes through the first ultrafiltration membrane unit. The concentrated water side and the water inlet side of the ultrafiltration membrane unit are discharged from the sewage outlet;

Step 3, stop the machine for soaking, and after the pollutants accumulate on the surface of the soft film, continue to carry out the air washing, water backwashing and sewage discharge in steps 1 and 2, and then restore the water production;

If the sewage is not completely drained during the recovery of water production from the first ultrafiltration membrane unit, return it to the ultrafiltration water inlet tank through the concentrated water pipeline connected to the first ultrafiltration membrane unit to slow down the membrane fouling;

The cleaning step of the second ultrafiltration membrane unit is the same as the cleaning step of the first ultrafiltration membrane unit.

10. the operation method of drinking water ultrafiltration system as claimed in claim 8, is characterized in that, comprises the following steps:

When the first ultrafiltration membrane unit is producing water: open the ultrafiltration UF01 membrane water inlet valve, ultrafiltration UF01 water production valve, ultrafiltration total water production valve, open the ultrafiltration water supply pump, and open the pressure drive of the raw water in the ultrafiltration water supply pump Then, enter the first ultrafiltration membrane unit to start water production; preferably, when the quality of the raw water becomes poor, open the ultrafiltration UF01 concentrated water valve at the same time, part of the water enters the first ultrafiltration membrane unit for filtration, and part of the water returns to The ultrafiltration water inlet tank forms cross-flow to reduce membrane fouling;

When cleaning the first ultrafiltration membrane unit, air washing, water backwashing and soaking are performed successively:

When air washing, start the air compressor 7, open the ultrafiltration UF01 upper exhaust valve and ultrafiltration UF01 intake valve, and carry out air washing;

When backwashing with water, open the ultrafiltration UF02 water inlet valve, ultrafiltration UF02 water production valve, ultrafiltration UF01 water production valve, ultrafiltration UF01 upper discharge valve, ultrafiltration UF01 lower discharge valve, and pass the high yield of the second ultrafiltration membrane unit. The water backwashes the first ultrafiltration membrane unit to wash away the pollutants on the membrane surface of the first ultrafiltration membrane unit. The pollutants pass through the ultrafiltration UF01 upper discharge valve and the ultrafiltration UF01 lower discharge valve, and the sewage is discharged by gravity; When the gravity discharge sewage cannot be drained, open the ultrafiltration UF01 water inlet valve and the ultrafiltration UF01 concentrated water valve, and flush the water into the ultrafiltration water inlet tank;

During soaking, when the first ultrafiltration membrane unit completes the physical backwashing process, it stops soaking to accumulate pollutants on the surface of the soft membrane, and then performs water backwashing and gravity blowdown to restore the membrane flux;

When the second ultrafiltration membrane unit is producing water: open the ultrafiltration UF02 water inlet valve, ultrafiltration UF02 water production valve, ultrafiltration total water production valve, open the ozone generator, open the ultrafiltration water supply pump, and the raw water mixed with ozone is Driven by the pressure of the ultrafiltration water supply pump, it enters the second ultrafiltration membrane unit to start water production. As an option, when the quality of the raw water becomes poor, the ultrafiltration UF02 concentrated water valve can be opened at the same time, and part of the water enters the second ultrafiltration membrane. The membrane unit is filtered, and part of the water is returned to the ultrafiltration water inlet tank to form cross-flow to reduce membrane fouling;

When cleaning the second ultrafiltration membrane unit, air washing, water backwashing and soaking are performed successively:

During water and air washing, start the air compressor, open the ultrafiltration UF02 upper exhaust valve and ultrafiltration UF02 intake valve;

When backwashing with water, open the ultrafiltration UF01 membrane water inlet valve, ultrafiltration UF01 water production valve, ultrafiltration UF02 water production valve, ultrafiltration UF02 upper discharge valve, ultrafiltration UF02 lower discharge valve, and pass the first ultrafiltration membrane unit. The high-yield water backwashes the second ultrafiltration membrane unit to flush out the membrane surface pollutants of the second ultrafiltration membrane unit. The pollutants pass through the ultrafiltration UF02 upper discharge valve and the ultrafiltration UF02 lower discharge valve, and the sewage is discharged by gravity; When the gravity discharge sewage cannot be drained, open the ultrafiltration UF02 water inlet valve and the ultrafiltration UF02 concentrated water valve, and flush the water into the ultrafiltration water inlet tank;

During soaking, when the second ultrafiltration membrane unit completes the physical backwashing process, it stops soaking to accumulate pollutants on the surface of the soft membrane, and then performs water backwashing and gravity blowdown to restore the membrane flux.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention cancels the backwash pump and sets up two switchable ultrafiltration membrane units. The two ultrafiltration membrane units are mutually backwashed to remove the contamination of the membrane by suspended solids and colloids, thereby realizing the recovery of the membrane flux. Two switchable ultrafiltration membrane units run at the same time or one is used for backup, which improves the water production efficiency of the system. In addition, the cancellation of the backwashing equipment reduces the system cost.

2. In the present invention, the pollution of the membrane surface by bacteria and microorganisms is controlled by filling the water into the ozone, the dosing equipment is cancelled, the introduction of sodium hypochlorite is avoided, the simplified and stable operation of the ultrafiltration water supply and the drug-free water supply are realized, and the drinking water is guaranteed. water safety.

3. Ozone is continuously introduced in the process of water production, which prevents bacteria and microorganisms from growing on the ultrafiltration membrane unit, and improves the cleanliness of water production.

Description of drawings

FIG. 1 is a schematic structural diagram of the drinking water ultrafiltration system of the present invention.

In the picture:

1-Ultrafiltration water inlet tank, 2-Ozone generator, 3-Ultrafiltration water supply pump, 4-The first ultrafiltration membrane unit, 5-The second ultrafiltration membrane unit, 6-Ultrafiltration production water tank, 7-Air pressure machine, 8-output pipeline, 9-water supply pipeline, 10-first branch, 11-second branch, 12-security filter inlet and outlet water pipeline, 13-first air pipeline, 14-second air Pipeline, 15-First water production branch, 16-Product water pipeline, 17-Second water production branch, 18-First lower discharge pipeline, 19-First upper discharge pipeline, 20-Second lower pipeline Drain pipeline, 21-second upper drain pipeline, 22-first concentrated water pipeline, 23-second concentrated water pipeline.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Example 1

A drinking water ultrafiltration system with no dosing and no power backwashing, comprising an ultrafiltration water inlet tank 1, an ozone generator 2, an ultrafiltration water supply pump 3, a first ultrafiltration membrane unit 4, and a second ultrafiltration membrane unit 5. Ultrafiltration water production tank 6 and air compressor 7, including:

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, and 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 to the water supply pipeline 9, and the water supply pipeline 9 is communicated with the water inlet port of the first ultrafiltration membrane unit 4 through the first branch 10, and the water supply pipeline 9 passes through The second branch 11 is communicated with the water inlet port of the second ultrafiltration membrane unit 5, the water outlet port of each ultrafiltration membrane unit is connected to the water outlet pipeline through the water outlet branch, and the water outlet pipeline is connected to the The ultrafiltration water production tank 6, the air compressor 7 is respectively connected to the water inlet side of each ultrafiltration membrane unit through an air pipeline, and the water outlet branches of the two ultrafiltration membrane units are connected to form a backwash pipeline. Both the concentrated water side and the water inlet side of the membrane unit are provided with sewage outlets, and 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 production step: groundwater enters the ultrafiltration water inlet tank 1, and 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. The unit 5 performs ultrafiltration, and enters the ultrafiltration water production tank 6 through the water outlet port of the ultrafiltration membrane unit; at the same time, the ozone generating device 2 is started, and the ozone enters the ultrafiltration membrane unit with water to disinfect and control the bacteria on the membrane surface. and microorganisms; in the process of water production, the ozone generator operates at the same time, and the ozone stops entering when the water production stops, so that it can be disinfected at any time. Compared with the traditional sodium hypochlorite cleaning, the cleanliness is further improved, avoiding bacteria and microorganisms. breeding, while avoiding drug residues.

The step that the first ultrafiltration membrane unit 4 is cleaned:

Step 1, air washing step: start the air compressor 7, the air enters the first ultrafiltration membrane unit 4 through the air pipeline and the water inlet side, and the sewage outlet on the concentrated water side is opened for sewage discharge;

Step 2, water backwashing step: the water produced by the second ultrafiltration membrane unit 5 enters the first ultrafiltration membrane unit 4 through the backwashing pipeline, and after flushing the membrane surface pollutants of the first ultrafiltration membrane unit 4, the sewage It is discharged through the sewage outlet of the concentrated water side and the water inlet side of the first ultrafiltration membrane unit 4;

Step 3, stop soaking, and after the contaminants accumulate on the surface of the soft membrane, continue to perform the water backwashing and sewage discharge in Step 2, and then restore the membrane flux.

When the gravity discharge sewage cannot be drained, open the ultrafiltration UF01 water inlet valve and the ultrafiltration UF01 concentrated water valve, and flush the water into the ultrafiltration water inlet tank to slow down the membrane pollution.

The cleaning steps of the second ultrafiltration membrane unit 5 are the same as the cleaning steps of the first ultrafiltration membrane unit 4 .

Preferably, a pipeline mixer is provided on the 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 disinfecting effect is optimized. In order to improve 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 volume of the ozone generator 2 is controlled to match the water production volume. When the water production volume is large, the oxygen production volume of the ozone generator 2 is increased at the same time. When the water volume is small, the oxygen production volume of the ozone generator 2 is reduced at the same time.

Example 2

The drinking water ultrafiltration system with no dosing and no power backwashing also includes a security filter inlet and outlet pipelines and a security filter arranged on the security filter inlet and outlet pipelines. The security filter inlet and outlet pipelines 12 Parallel pipelines are formed on part of the water supply pipelines 9 in parallel, and a drainage pipeline is arranged at the bottom of the security filter, and a DN50 discharge valve is arranged on the drainage pipeline. The security filter is used to block the possible damage to the membrane wire caused by large particles of impurities.

Preferably, a first manual valve V07 is provided on the water supply pipeline 9 connected in parallel with the security filter water inlet and outlet pipeline 12, and a second manual valve V08 is provided on the security filter water inlet and outlet pipeline 12. When the 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. When the second manual valve When V08 is opened and the first manual valve V07 is closed, the water pumped by the ultrafiltration water supply pump 3 enters the first ultrafiltration membrane unit 4 and/or the second ultrafiltration membrane unit 5 after being filtered by the security filter.

The 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 is provided with a third manual valve V01 and a fourth manual valve V04. It is convenient for the maintenance of the equipment after the ultrafiltration water inlet tank 1 and the maintenance of the ultrafiltration water supply pump 3 .

The water supply pipeline 9 between the ultrafiltration water supply pump 3 and the parallel pipeline is provided with a check valve CV02 and a fifth manual valve V06. The check valve CV02 is used to prevent the backflow of water, and the fifth manual valve V06 is set for easy maintenance.

A control valve is provided on the pipeline between the ozone generating device 2 and the output pipeline 8 to control the entry of ozone into the ultrafiltration system.

Preferably, the air compressor 7 is connected to the water inlet side of the first ultrafiltration membrane unit 4 through the first air pipeline 13 , and is connected to the second ultrafiltration membrane unit through the second air pipeline 14 5, the first air pipeline 13 is provided with an ultrafiltration UF01 intake valve EV06, and the second air pipeline 14 is provided with an ultrafiltration UF02 intake valve EV12.

The first ultrafiltration membrane unit 4 is composed of two parallel ultrafiltration membrane filtration devices, the first branch 10 is provided with an ultrafiltration UF01 membrane water inlet valve EV01, and the first ultrafiltration membrane unit 4 passes through. The first water production branch 15 is connected to the water production pipeline 16, the first water production branch 15 is provided with an ultrafiltration UF01 water production valve EV03, and the water production pipeline 16 is provided with an ultrafiltration total water production valve EV13 , the water production pipeline 16 is connected to the ultrafiltration water production tank 6;

The second ultrafiltration membrane unit 5 is composed of two parallel ultrafiltration membrane filtration devices, the second branch 11 is provided with an ultrafiltration UF02 water inlet valve EV07, and the second ultrafiltration membrane unit 5 passes through the second ultrafiltration membrane unit 5. The second water production branch 17 is connected to the water production pipeline 16 , and an ultrafiltration UF02 water production valve EV09 is provided on the second water production branch 17 .

The first water production branch 15 and the second water production branch 17 constitute 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, and an ultrafiltration UF01 lower discharge valve EV05 is arranged on the first lower discharge pipeline 18. The first ultrafiltration membrane The concentrated water side of the unit 4 is connected with a first upper discharge pipeline 19, and the first upper discharge pipeline 19 is provided with an ultrafiltration UF01 upper discharge valve EV04, and the water inlet side of the second ultrafiltration membrane unit 5 is connected There is a second lower discharge pipeline 20, the second lower discharge pipeline 20 is provided with an ultrafiltration UF02 lower discharge valve EV11, and the concentrated water side of the second ultrafiltration membrane unit 5 is connected with a second upper discharge pipeline 21. The second upper discharge pipeline 21 is provided with an ultrafiltration UF02 upper discharge valve EV10;

The concentrated water side of the first ultrafiltration membrane unit 4 is also connected to the ultrafiltration water inlet tank 1 through the first concentrated water pipeline 22, and the first concentrated water pipeline 22 is provided with an ultrafiltration UF01 concentrated water valve EV02 , the concentrated water side of the second ultrafiltration membrane unit 5 is also connected to the ultrafiltration water inlet tank 1 through the second concentrated water pipeline 23, and the second concentrated water pipeline 23 is provided with an ultrafiltration UF02 concentrated water valve EV08;

Example 3

Operation method of drinking water ultrafiltration system in embodiment 2:

When the first ultrafiltration membrane unit 4 produces water: open the ultrafiltration UF01 membrane water inlet valve EV01, ultrafiltration UF01 water production valve EV03, ultrafiltration total water production valve EV13, open the ozone generator 2, and open the ultrafiltration water supply pump 3 . The raw water mixed with ozone is driven by the pressure of the ultrafiltration water supply pump 3, and enters the first ultrafiltration membrane unit 4 to start water production. When the quality of the raw water deteriorates, the ultrafiltration UF01 concentrated water valve EV02 can be opened at the same time, and part of the water enters It is filtered in the first ultrafiltration membrane unit 4, and part of the water is returned to the ultrafiltration water inlet tank 1 to form a cross flow to reduce membrane fouling.

When cleaning the first ultrafiltration membrane unit 4, air washing, water backwashing and soaking are performed successively:

During air washing, start the air compressor 7, open the upper exhaust valve EV04 of the ultrafiltration UF01, and the intake valve EV06 of the ultrafiltration UF01 to carry out air washing.

When backwashing with water, open the ultrafiltration UF02 water inlet valve EV07, ultrafiltration UF02 water production valve EV09, ultrafiltration UF01 water production valve EV03, ultrafiltration UF01 upper discharge valve EV04, ultrafiltration UF01 lower discharge valve EV05, and pass the second ultrafiltration valve. The high-yield water of the filter membrane unit 5 carries out reverse flushing to the first ultrafiltration membrane unit 4, and flushes the membrane surface pollutants of the first ultrafiltration membrane unit 4. The pollutants pass through the ultrafiltration UF01 upper discharge valve EV04, and the ultrafiltration UF01 lowers Drain valve EV05, which discharges sewage by gravity.

When the gravity discharge sewage cannot be drained, open the ultrafiltration UF01 water inlet valve EV01 and the ultrafiltration UF01 concentrated water valve EV02, and flush the water into the ultrafiltration water inlet tank to slow down the membrane pollution.

Soaking: When the first ultrafiltration membrane unit 4 completes the physical backwashing process, it stops soaking to accumulate pollutants on the surface of the soft membrane, and then perform the water backwashing and gravity blowdown to restore the membrane flux and start water production.

When the second ultrafiltration membrane unit 5 produces water, open the ultrafiltration UF02 water inlet valve EV07, ultrafiltration UF02 water production valve EV09, ultrafiltration total water production valve EV13, open the ozone generator 2, and open the ultrafiltration water supply pump 3. The raw water mixed with ozone is driven by the pressure of the ultrafiltration water supply pump 3 and enters the second ultrafiltration membrane unit 5 to start water production. When the quality of the raw water deteriorates, the ultrafiltration UF02 concentrated water valve EV08 can be opened at the same time, part of the water enters the second ultrafiltration membrane unit 5 for filtration, and part of the water returns to the ultrafiltration water inlet tank 1 to form a cross-flow mitigation membrane Pollution.

When the second ultrafiltration membrane unit 5 is cleaned, air washing, water backwashing and soaking are successively performed:

During water and air washing, start the air compressor 7, open the ultrafiltration UF02 upper discharge valve EV10, and the ultrafiltration UF02 intake valve EV12.

When backwashing with water, open the ultrafiltration UF01 membrane inlet valve EV01, ultrafiltration UF01 water production valve EV03, ultrafiltration UF02 water production valve EV09, ultrafiltration UF02 upper discharge valve EV10, ultrafiltration UF02 lower discharge valve EV11, through the first The high-yield water of the ultrafiltration membrane unit 4 backwashes the second ultrafiltration membrane unit 5, and flushes the membrane surface pollutants of the second ultrafiltration membrane unit 5. The pollutants pass through the ultrafiltration UF02 upper discharge valve EV10, and the ultrafiltration UF02 The lower discharge valve EV11, discharges sewage by gravity.

When the gravity discharge sewage cannot be drained, open the ultrafiltration UF02 water inlet valve EV07 and the ultrafiltration UF02 concentrated water valve EV08, and flush the water into the ultrafiltration water inlet tank to slow down the membrane pollution.

During soaking, when the second ultrafiltration membrane unit 5 completes the physical backwashing process, it stops soaking to accumulate pollutants on the surface of the soft membrane, and then performs water backwashing and gravity blowdown to restore the membrane flux.

For ease of description, spatially relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to describe how one element or feature shown in the figures is relative to another element or feature. relation. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to encompass different orientations of the device in use or operation. 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 upper and lower positions. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative references used herein interpreted accordingly.

Moreover, relational terms such as "first" and "second" etc. are only used to distinguish one element from another having the same name and do not necessarily require or imply any such actual existence between those elements relationship or order.

The above are only the preferred embodiments of the present invention. It should be noted that, for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (10)

1. a drinking water ultrafiltration system without dosing, without power backwashing, is characterized in that, comprises ultrafiltration water inlet tank, ozone generator, ultrafiltration water supply pump, the first ultrafiltration membrane unit, the second ultrafiltration Membrane units, ultrafiltration product water tanks, and air compressors, including: 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, and the outlet of the ultrafiltration water supply pump is connected. The water port is connected to 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, and the water supply pipeline is connected to the second ultrafiltration membrane through a second branch The water inlet ports of the units are connected, the water outlet port of each ultrafiltration membrane unit is connected to the water outlet pipeline through the water outlet branch, and the water outlet pipeline is connected to the ultrafiltration water production tank, and the air compressors are respectively connected through the air pipes. The circuit is connected to the water inlet side of each ultrafiltration membrane unit, the water outlet branches of the two ultrafiltration membrane units are connected to form a backwash pipeline, and each ultrafiltration membrane unit is provided with a sewage outlet on the concentrated water side and the water inlet side . 2. The drinking water ultrafiltration system without dosing as claimed in claim 1, without power backwashing, is characterized in that, the concentrated water side of each ultrafiltration membrane unit is connected to the ultrafiltration influent by concentrated water pipeline box. 3. The drinking water ultrafiltration system without dosing and backwashing without power as claimed in claim 1, wherein the pipeline between the ozone generator and the output pipeline is provided with a control valve, so that the A pipeline mixer is arranged on the pipeline between the ozone generating device and the output pipeline. 4. the drinking water ultrafiltration system without dosing as claimed in claim 1, without power backwashing, is characterized in that, also comprises security filter inlet and outlet water pipelines and the security filter that is arranged on described security filter inlet and outlet water pipelines The security filter inlet and outlet pipelines are connected in parallel with part of the water supply pipelines to form parallel pipelines, the bottom of the security filter is provided with a drainage pipeline, and the drainage pipeline is provided with a discharge valve. 5. The drinking water ultrafiltration system without dosing as claimed in claim 4, without power backwashing, is characterized in that, the water supply pipeline connected in parallel with the water inlet and outlet pipelines of the security filter is provided with the first manual valve, the security A second manual valve is provided on the inlet and outlet pipes of the filter. 6. The drinking water ultrafiltration system without dosing as claimed in claim 1, without power backwashing, is characterized in that, between the water outlet of the ultrafiltration water inlet tank and the water inlet of the ultrafiltration water supply pump A third manual valve and a fourth manual valve are arranged on the output pipeline of the device, and the third manual valve and the fourth manual valve are respectively arranged on both sides of the pipeline for connecting the ozone generating device. 7. The drinking water ultrafiltration system without dosing and backwashing without power as claimed in claim 4, wherein the water supply pipeline between the ultrafiltration water supply pump and the parallel pipeline is provided with a check valve and fifth manual valve. 8. The drinking water ultrafiltration system without dosing and power backwashing according to claim 1, wherein the air compressor is connected to the first ultrafiltration membrane unit through a first air pipeline. On the water inlet side, the air compressor is connected to the water inlet side of the second ultrafiltration membrane unit through the second air pipeline, and the first air pipeline is provided with an ultrafiltration UF01 intake valve, and the second There is an ultrafiltration UF02 intake valve on the air pipeline; The first ultrafiltration membrane unit is composed of two parallel ultrafiltration membrane filtration devices, the first branch is provided with an ultrafiltration UF01 membrane water inlet valve, and the first ultrafiltration membrane unit passes through the first water production branch. connected to the water production pipeline, the first water production branch is provided with an ultrafiltration UF01 water production valve, the water production pipeline is provided with an ultrafiltration main water production valve, and the water production pipeline is connected to the ultrafiltration product water tank; The second ultrafiltration membrane unit is composed of two parallel ultrafiltration membrane filtration devices, the second branch is provided with an ultrafiltration UF02 water inlet valve, and the second ultrafiltration membrane unit passes through the second water production branch. It is connected to the water production pipeline, and the second water production branch is provided with an ultrafiltration UF02 water production valve; The first water production branch and the second water production branch constitute a backwash 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, and an ultrafiltration UF01 lower discharge valve EV05 is arranged on the first lower discharge pipeline, and the concentrated water of the first ultrafiltration membrane unit is The side is connected with a first upper discharge pipeline, an ultrafiltration UF01 upper discharge valve is arranged on the first upper discharge pipeline, and a second lower discharge pipeline is connected to the water inlet side of the second ultrafiltration membrane unit. 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 exhaust valve; The concentrated water side of the first ultrafiltration membrane unit is also connected to the ultrafiltration water inlet tank through the first concentrated water pipeline, and the first concentrated water pipeline is provided with an ultrafiltration UF01 concentrated water valve, and the second ultrafiltration The concentrated water side of the filter membrane unit is also 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. The operation method of the drinking water ultrafiltration system according to any one of claims 1-8, characterized in that, comprising the following steps: Water production step: groundwater enters the ultrafiltration water inlet tank, and 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. , enter the ultrafiltration water production tank through the water outlet port of the ultrafiltration membrane unit; at the same time, start the ozone generator, and the ozone and water enter the ultrafiltration membrane unit for disinfection, controlling the bacteria and microorganisms on the membrane surface; The steps of cleaning the first ultrafiltration membrane unit: Step 1, air washing step: start the air compressor, the air enters the first ultrafiltration membrane unit through the air pipeline and the water inlet side, and the sewage outlet on the concentrated water side is opened for sewage discharge; Step 2, water backwashing step: the water generated by the second ultrafiltration membrane unit enters the first ultrafiltration membrane unit through the backwashing pipeline, and after flushing the membrane surface pollutants of the first ultrafiltration membrane unit, the sewage passes through the first ultrafiltration membrane unit. The concentrated water side and the water inlet side of the ultrafiltration membrane unit are discharged from the sewage outlet; Step 3, stop the machine for soaking, and after the pollutants accumulate on the surface of the soft film, continue to carry out the air washing, water backwashing and sewage discharge in steps 1 and 2, and then restore the water production; Preferably, if the sewage is not completely drained during the recovery process of the first ultrafiltration membrane unit, return it to the ultrafiltration water inlet tank through the concentrated water pipeline connected to the first ultrafiltration membrane unit , to slow down membrane fouling; The cleaning step of the second ultrafiltration membrane unit is the same as the cleaning step of the first ultrafiltration membrane unit. 10. the operation method of drinking water ultrafiltration system as claimed in claim 8, is characterized in that, comprises the following steps: When the first ultrafiltration membrane unit is producing water: open the ultrafiltration UF01 membrane water inlet valve, ultrafiltration UF01 water production valve, ultrafiltration total water production valve, open the ultrafiltration water supply pump, and open the pressure drive of the raw water in the ultrafiltration water supply pump Then, enter the first ultrafiltration membrane unit to start water production; preferably, when the quality of the raw water becomes poor, open the ultrafiltration UF01 concentrated water valve at the same time, part of the water enters the first ultrafiltration membrane unit for filtration, and part of the water returns to The ultrafiltration water inlet tank forms cross-flow to reduce membrane fouling; When cleaning the first ultrafiltration membrane unit, air washing, water backwashing and soaking are performed successively: When air washing, start the air compressor, open the ultrafiltration UF01 upper exhaust valve and ultrafiltration UF01 intake valve, and carry out air washing; When backwashing with water, open the ultrafiltration UF02 water inlet valve, ultrafiltration UF02 water production valve, ultrafiltration UF01 water production valve, ultrafiltration UF01 upper discharge valve, ultrafiltration UF01 lower discharge valve, and pass the high yield of the second ultrafiltration membrane unit. The water backwashes the first ultrafiltration membrane unit to wash away the pollutants on the membrane surface of the first ultrafiltration membrane unit. The pollutants pass through the ultrafiltration UF01 upper discharge valve and the ultrafiltration UF01 lower discharge valve, and the sewage is discharged by gravity; When the gravity discharge sewage cannot be drained, open the ultrafiltration UF01 water inlet valve and the ultrafiltration UF01 concentrated water valve, and flush the water into the ultrafiltration water inlet tank; During soaking, when the first ultrafiltration membrane unit completes the physical backwashing process, it stops soaking to accumulate pollutants on the surface of the soft membrane, and then performs water backwashing and gravity blowdown to restore the membrane flux; When the second ultrafiltration membrane unit is producing water: open the ultrafiltration UF02 water inlet valve, ultrafiltration UF02 water production valve, ultrafiltration total water production valve, open the ozone generator, open the ultrafiltration water supply pump, and the raw water mixed with ozone is Driven by the pressure of the ultrafiltration water supply pump, it enters the second ultrafiltration membrane unit to start water production; as an option, when the quality of the raw water becomes poor, the ultrafiltration UF02 concentrated water valve can be opened at the same time, and part of the water enters the second ultrafiltration membrane. The membrane unit is filtered, and part of the water is returned to the ultrafiltration water inlet tank to form cross-flow to reduce membrane fouling; When cleaning the second ultrafiltration membrane unit, air washing, water backwashing and soaking are performed successively: During water and air washing, start the air compressor, open the ultrafiltration UF02 upper exhaust valve and ultrafiltration UF02 intake valve; When backwashing with water, open the ultrafiltration UF01 membrane water inlet valve, ultrafiltration UF01 water production valve, ultrafiltration UF02 water production valve, ultrafiltration UF02 upper discharge valve, ultrafiltration UF02 lower discharge valve, and pass the first ultrafiltration membrane unit. The high-yield water backwashes the second ultrafiltration membrane unit to flush out the membrane surface pollutants of the second ultrafiltration membrane unit. The pollutants pass through the ultrafiltration UF02 upper discharge valve and the ultrafiltration UF02 lower discharge valve, and the sewage is discharged by gravity; When the gravity discharge sewage cannot be drained, open the ultrafiltration UF02 water inlet valve and the ultrafiltration UF02 concentrated water valve, and flush the water into the ultrafiltration water inlet tank; During soaking, when the second ultrafiltration membrane unit completes the physical backwashing process, it stops soaking to accumulate pollutants on the surface of the soft membrane, and then performs water backwashing and gravity blowdown to restore the membrane flux.

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