CN106396214A - Detachable washing type multi-stage water filtration and purification system - Google Patents

Abstract

The present invention relates to the technical field of water purification equipment, and specifically discloses a detachable flushing type multi-stage filtration water purification system, comprising: a first filter unit connected to a water inlet pipeline and a water outlet pipeline in sequence; the first filter unit is Detachable setting; the body of the first filter unit is provided with a polyvinylidene fluoride (PVDF) hollow fiber membrane module, and the top cover of the first filter unit is provided with granular activated carbon, activated carbon fiber, activated carbon or PP cotton sheet to filter tap water. In the invention, the low-pressure lining reinforced polyvinylidene fluoride hollow fiber membrane module is used as the initial unit of pretreatment, which can effectively protect subsequent activated carbon and membrane filter components, prolong their service life, and maintain the stability of system water treatment quality.

Description

A detachable flushing multi-stage filtration water purification system

technical field

The invention relates to the technical field of water purification equipment, in particular to a detachable flushing type multi-stage filtration water purification system.

Background technique

Membrane separation technology uses pressure as the driving force to selectively separate mixed liquids through membrane pore size and surface affinity. Compared with traditional separation methods, membrane separation has high selectivity, low energy consumption, high separation efficiency and convenience. Achieve automation and other advantages. The household multi-stage water purification system is based on membrane filtration technology, combined with pretreatment processes such as activated carbon and PP cotton adsorption at the front end, and activation, taste adjustment, and functionalization of mineral elements at the rear end to form a variety of high-quality products with different treatment effects and different functions. , Medium and low-end water purification equipment.

Household water purifiers use adsorption and filtration to effectively remove bacteria, suspended solids, sediment, rust colloids, heavy metals and soluble small molecules, etc., and adjust the taste through filter materials, increase mineral elements, and provide people with safe and healthy water in real time. drinking water. The adsorption and filtration of this water purifier is considered to be the best way to solve drinking water safety and alleviate the shortage of safe water. The penetration rate of domestic water purifiers in developed countries has reached as high as 85%, while in China it is less than 10%. However, in recent years, the domestic domestic water purification market has developed rapidly, especially in terms of quality, which no longer satisfies simple filtration or adsorption functions. Pay more attention to water purification indicators and user experience.

The pre-pretreatment devices of the existing multi-stage water purification system all use sintered PP cotton and activated carbon. The filter pore size of PP cotton is greater than 5 microns, the interception performance is limited, and the purification quality is not guaranteed; and PP cotton mainly removes impurities in water through adsorption. The life is short, and it needs to be replaced continuously to increase the maintenance cost, and the failure to replace it in time after the adsorption is saturated will cause secondary pollution of water quality. In a multi-stage water purification system, pretreatment determines the efficiency and service life of the subsequent process, so pretreatment is the core and key part of the entire water purification system.

Contents of the invention

In view of this, it is necessary to provide a detachable flushing system for the problems of insufficient pretreatment precision of sintered PP cotton and activated carbon, unstable purification quality, short service life and possible secondary pollution in the existing multi-stage water purification system. Multi-stage filtration water purification system.

To achieve the above object, the present invention takes the following technical solutions:

The detachable flushing multi-stage filtration water purification system of the present invention comprises: a first filter unit and an outlet pipeline sequentially connected to the water inlet pipe; the first filter unit is detachable; the first filter unit body A polyvinylidene fluoride (PVDF) hollow fiber membrane module is provided, and the top cover of the first filter unit is provided with granular activated carbon, activated carbon fiber, activated carbon or PP cotton sheets to filter tap water.

Further, in order to adapt to different influent water quality and meet the requirements of different quality effluent water, the filter water purification system also includes at least one of the second filter unit, the third filter unit, the fourth filter unit and the first filter unit. Units are combined in series.

To improve versatility, all filter units are connected using standard piping and interface connections.

Further, activated carbon, activated carbon fibers or ultrafiltration membrane modules are arranged in the second filter unit body;

Granular activated carbon or silver-loaded activated carbon fiber is set at the top cover of the third filter unit; the third filter unit body is provided with ultrafiltration filter membrane, nanofiltration filter membrane, reverse osmosis filter membrane (RO membrane), medical stone or mass ratio of 1:1 ion exchange resin and activated carbon;

The body and/or top cover of the fourth filter unit is provided with one or more of activated carbon, activated carbon fiber, silver-loaded activated carbon, silver-loaded activated carbon fiber, ion exchange resin or medical stone.

The first filter unit and the second filter unit are pre-treatment systems; the third filter unit is a deep purification system; the fourth filter unit is a post-filter system. In order to adapt to different influent water quality and meet different quality effluent water requirements, the present invention can flexibly use one or more combinations of the first filter unit and subsequent filter units in series, that is, multiple second, third or The fourth filter unit is connected in series with the first filter unit, or a plurality of different second, third or fourth filter units can be mixed and connected in series and combined with the first filter unit in series.

Further, a booster pump is also provided between the first filter unit and the water outlet pipeline.

Further, a sensor for detecting water quality TDS and water temperature is also arranged at the outlet of the water outlet pipe.

The ultra-low pressure lining reinforced polyvinylidene fluoride hollow fiber membrane of the present invention has a gradient pore structure and a thin single separation skin layer. The water outlet pressure of the module is as low as 0.5-1atm, and the mechanical strength is greater than 10MPa. It can maintain a relatively high pressure under tap water pressure. The effluent flux is 2500-3500LMH under standard conditions, which can remove all suspended solids, sediment, rust colloids, and soluble macromolecular impurities in the water.

The ultra-low pressure lining reinforced polyvinylidene fluoride hollow fiber membrane module can be removed and cleaned for multiple uses, and the flux can be restored by flushing with tap water or other conventional flushing methods.

The low-pressure lining reinforced polyvinylidene fluoride hollow fiber membrane module of the present invention has high mechanical strength and low filtration pressure during use, and pretreatment will not cause adsorption saturation problems such as activated carbon or PP cotton pretreatment, and the membrane will be disassembled and rinsed after being polluted. Or it can be used repeatedly after scrubbing, with high filtration accuracy and long service life, which can greatly reduce the problems of secondary pollution caused by replacement, high replacement cost and troublesome replacement; the low-pressure lined reinforced polyvinylidene fluoride hollow fiber membrane module is used as a forecast The starting unit of the treatment can effectively protect the subsequent activated carbon and membrane filtration components, prolong their service life, and maintain the stability of the water treatment quality of the system.

The beneficial effects of the present invention are:

1. The low-pressure lining reinforced polyvinylidene fluoride hollow fiber membrane of the present invention has a gradient pore structure, a thin single separation skin layer, and is packaged into a U-shaped membrane module with a quick connection interface. The membrane module has high mechanical strength and low filtration pressure. It can be used repeatedly after dismantling and washing, and the maintenance cost is low, which meets the needs of conventional household water purification equipment.

2. The pretreatment technology of the present invention can effectively remove suspended matter in water, silt, rust colloid, and soluble macromolecular impurities, with stable filtration performance, protection of subsequent filtration membranes, and guaranteed water quality.

3. Membrane treatment technology uses the principle of aperture sieve to separate and remove large-scale impurities in water without secondary pollution.

Description of drawings

Fig. 1 is a schematic structural view of one embodiment of the detachable flushing type multi-stage filtration water purification system of the present invention;

Fig. 2 is a schematic structural view of one embodiment of the detachable flushing type multi-stage filtration water purification system of the present invention;

Fig. 3 is a structural schematic diagram of one embodiment of the detachable flushing multi-stage filtration water purification system of the present invention.

Reference signs: 1, the first filter unit; 11, the top cover of the first filter unit; 12, the first filter unit body; 2, the second filter unit; 22, the second filter unit body; 3, the third filter unit; 31. The top cover of the third filter unit; 32. The body of the third filter unit; 4. The water inlet pipe; 5. The water outlet pipe; 6. The booster pump; 7. The fourth filter unit; 71. The top cover of the fourth filter unit; 72. The fourth filter unit body.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further clearly and completely described below in conjunction with the embodiments of the present invention. It should be noted that the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

At present, the pipelines for transporting tap water have been soaked in water for many years, sealed in the wall or underground, there is no effective maintenance method, and it is difficult to achieve regular maintenance. The household water purification solution is the most effective solution to the safety of drinking water, and the running water does not rot. Household water purification equipment is manually disassembled and cleaned regularly or parts and pipes are replaced to remove sediment in time, keep the internal waterway clean and unimpeded, and ensure the continuous supply of safe and healthy drinking water; at the same time, only the water entering the human body is purified, accounting for About 2% of domestic water, other household cleaning water does not need any treatment, saving the cost of water treatment.

The present invention combines the characteristics of household water purification products currently on the market, uses the PVDF low-pressure filter membrane supported by the lining as the key component of pretreatment, and designs a detachable flushing multi-stage filtration water purification system.

Example 1

Referring to FIG. 1 , the detachable flushing multi-stage filtration water purification system includes a first filter unit 1 , a second filter unit 2 , a third filter unit 3 , and a water outlet pipeline 5 connected in sequence to a water inlet pipe 4 . Among them, the ultra-low pressure lining reinforced PVDF hollow fiber membrane module is set in the first filter unit body 12, the activated carbon fiber is set on the top cover 11 of the first filter unit, the ultrafiltration membrane module is set in the second filter unit body 22, and the third filter unit Granular activated carbon is arranged on the top cover 31 , and an ultrafiltration filter membrane is arranged in the third filter unit body 32 .

Among them, the water inlet pipe 4 is directly connected to the municipal tap water outlet valve. After the water enters the water purification system, it is first pre-filtered by ultra-low pressure lined reinforced PVDF hollow fiber membrane modules to remove sediment, rust, macromolecular suspended matter and most of them. bacteria. Then pass through activated carbon fiber, ultrafiltration membrane module, granular activated carbon and ultrafiltration filter membrane in turn to purify water while partially removing calcium and magnesium ions therein, adjust the hardness of water, and flow out from the outlet pipe 5 for drinking.

According to the difference of influent water quality, after the water purification system runs for a period of time (3-6 months), many pollutants will accumulate in the first filter unit 1, and the water output per unit time will gradually decrease. When the effluent flux is reduced to the initial When the flux is less than 50%, disassemble the top cover 11 of the first filter unit, take out the membrane assembly and rinse it under the tap water for 8-15 minutes, and scrub it vigorously by hand until the color of the surface changes back to the original white. Or no dirt comes out after several rinses. Then rinse the encapsulated end with tap water for 1-2 minutes, reinstall the component and continue to use it.

Since the pretreated PVDF hollow fiber membrane module can completely remove the particulate impurities and macromolecular suspended matter in the raw water, the subsequent activated carbon fiber, ultrafiltration membrane module, granular activated carbon, and ultrafiltration filtration membrane will receive less pollutants, so it is easy to use and replace The cycle is greatly extended, and it can be replaced every 10-15 months according to the difference in water quality.

Example 2

Referring to Fig. 1, the difference between embodiment 2 and embodiment 1 is only that the filter assembly provided in the filter unit is different, specifically: the ultra-low pressure lining reinforced PVDF hollow fiber membrane module is provided in the first filter unit body 12, the first filter unit The unit top cover 11 is provided with granular activated carbon, the second filter unit body 22 is provided with activated carbon, the third filter unit top cover 31 is provided with silver-loaded activated carbon fibers, and the third filter unit body 32 is provided with medical stones. The tap water in the water inlet pipe 4 sequentially flows through the detachable ultra-low pressure lining reinforced PVDF hollow fiber membrane module, granular activated carbon, activated carbon, silver-loaded activated carbon fiber and medical stone, and then flows out from the water outlet pipe 5 for drinking.

In this embodiment, while purifying water, medical stones are used to continuously and slowly release beneficial trace mineral elements into the water, so as to adjust the water salinity and increase drinking nutrition.

Example 3

Referring to Fig. 1, the difference between this embodiment 3 and embodiments 1 and 2 is only the difference of the filter assembly arranged in the filter unit, specifically: the ultra-low pressure lining reinforced PVDF hollow fiber membrane module is set in the first filter unit body 12 Granular activated carbon is set on the first filter unit top cover 11, activated carbon fiber is set on the second filter unit body 22, silver-loaded activated carbon fiber is set on the third filter unit top cover 31, and mass ratio is set to 1 in the third filter unit body 32: 1 ion exchange resin and activated carbon. After the tap water in the water inlet pipe 4 flows through the detachable ultra-low pressure lining reinforced PVDF hollow fiber membrane module, granular activated carbon, activated carbon fiber, silver-loaded activated carbon, ion exchange resin and activated carbon (mass ratio 1:1), the Water outlet pipe 5 flows out for drinking.

This embodiment softens and completely removes small molecular substances in the water while purifying, and the treated water can be directly drunk.

Example 4

Referring to Fig. 2, the difference between this embodiment and the above-mentioned embodiments 1-3 is that the filter assembly provided in the filter unit is different, and a fourth filter unit is also provided between the third filter unit 3 and the outlet pipe 5. Unit 7, the fourth filter unit 7 is used as a post filter system to further filter the water quality; and in this embodiment, a booster pump 6 is also added, and the booster pump 6 is arranged between the second filter unit 2 and the first filter unit On the pipeline between the three filter units 3. Specifically: the ultra-low pressure lining reinforced PVDF hollow fiber membrane module is set in the first filter unit body 12, granular activated carbon is set on the top cover 11 of the first filter unit; the ultrafiltration membrane module is set in the second filter unit body 22; the third filter unit A nanofiltration membrane is set in the unit body 32 ; a medical stone is set in the fourth filter unit body 72 , and silver-loaded activated carbon is set on the top cover 71 of the fourth filter unit. The tap water in the water inlet pipe 4 sequentially flows through the detachable ultra-low pressure lining reinforced PVDF hollow fiber membrane module, granular activated carbon, ultrafiltration membrane module, booster pump, nanofiltration membrane, medical stone, and silver-loaded activated carbon. , flow out by the water outlet pipe 5 for drinking.

Because the driving pressure of the nanofiltration membrane is relatively high (above 0.25MPa), the pressure of tap water is difficult to achieve under normal circumstances, so this embodiment adds a booster pump to the pipeline for use when the pressure is insufficient.

This embodiment softens and completely removes small molecular substances in water while purifying, uses medical stones to continuously slowly release beneficial trace mineral elements into water, adjusts water salinity, increases drinking nutrition, and the treated water can be directly drunk .

Example 5

Referring to Fig. 3, the difference between this embodiment 5 and embodiment 1 lies in the difference in the filter assembly arranged in the filter unit, and a booster pump 6 is also added in this embodiment, and the booster pump 6 is arranged in the second filter On the pipeline between unit 2 and the third filter unit 3. Specifically: the ultra-low pressure lining reinforced PVDF hollow fiber membrane module is set in the first filter unit body 12, granular activated carbon is set on the top cover 11 of the first filter unit, activated carbon is set on the second filter unit body 22, and the third filter unit body 32 Set RO membrane in. The tap water in the water inlet pipe 4 sequentially flows through the detachable ultra-low pressure lining reinforced PVDF hollow fiber membrane module, granular activated carbon, activated carbon, booster pump, RO membrane, and then flows out from the water outlet pipe 5 for drinking.

As a further optimization solution, the present invention can also install a sensor at the outlet of the water outlet pipe 5 to detect the water quality TDS and water temperature, and remind the user to replace and maintain it regularly, so as to improve the experience of use.

comparative example

Referring to Fig. 1, for adopting PP cotton to replace the PVDF hollow fiber membrane module in the present invention to filter, specifically: PP cotton is set in the first filter unit body 12, granular activated carbon is set on the first filter unit top cover 11, and the second filter unit The unit body 22 is provided with activated carbon, the top cover 31 of the third filter unit is provided with activated carbon fibers, and the third filter unit body 32 is provided with an ultrafiltration filter membrane. During the purification process, the tap water in the water inlet pipe flows through PP cotton, granular activated carbon, activated carbon, activated carbon fiber, and ultrafiltration filter membrane in sequence, and then reaches the water outlet pipe.

For further illustrating the effect of the system of the present invention, further performance test is done below:

Test Conditions

During the test, municipal tap water with stable water quality is used for continuous testing. When the permeation of purified water drops to 50% of the initial flux, it is considered that the service life of the water purification system is over, and the membrane components need to be cleaned. When the permeation flux of the filter element is low after cleaning At 60% of the initial flux, it is considered that the filter element needs to be replaced at the end of its life, and the water purification volume (L) of the system from the beginning of the test to the end of its life is recorded, which is the service life of the purification system; the replacement frequency is based on the daily drinking water consumption of each family 20L calculation; TDS test adopts conventional TDS test pen to carry out, and the TDS of testing each embodiment initial stage is recorded as the TDS of system; The number of colonies utilizes the rapid detection test paper of the total number of colonies to carry out, and records its negative (-) or positive (+) That's it. During the test, the raw water TDS was 96ppm, and the test results are shown in Table 1 below:

Table 1 different embodiment test results

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example 1 Service life (L) 3860 3920 3680 3536 3650 1690 Replacement frequency (days) 193 196 184 176 182 84 Effluent TDS 25.3 35.1 26.8 3.5 0.3 60 colony - - - -- -- +

Note: --means no colony staining area can be seen with the naked eye on the test paper after culture, which is no different from the negative control group;

- Indicates that after cultivation, a very small amount of colony staining area can be seen with the naked eye on the test paper, which is no different from the negative control group;

+ indicates that a small amount of colony staining area can be seen with the naked eye on the test paper after culture, which is obviously different from the negative control group.

It can be seen from Table 1 above that the present invention has stable filtration performance, protects the subsequent filtration membrane, ensures the quality of the effluent and prolongs the service life of the membrane.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (5)

1. A detachable flushing multi-stage filtration water purification system, characterized in that it comprises: a first filter unit and an outlet pipeline connected in sequence with the water inlet; the first filter unit is detachable; the The body of the first filter unit is provided with a polyvinylidene fluoride hollow fiber membrane module, and the top cover of the first filter unit is provided with granular activated carbon, activated carbon fiber, activated carbon or PP cotton sheet. 2. The detachable flushing multi-stage filter water purification system according to claim 1, further comprising at least one of the second filter unit, the third filter unit, the fourth filter unit and the first filter unit. Units are combined in series. 3. The detachable flushing type multi-stage filtration water purification system according to claim 2, characterized in that activated carbon, activated carbon fiber or ultrafiltration membrane assembly is arranged in the second filter unit body; The top cover of the third filter unit is provided with granular activated carbon or silver-loaded activated carbon fiber; the third filter unit body is provided with an ultrafiltration filter membrane, a nanofiltration filter membrane, a reverse osmosis filter membrane, medical stone or a 1:1 mass ratio Ion exchange resins and activated carbon; The body and/or top cover of the fourth filter unit is provided with one or more of activated carbon, activated carbon fiber, silver-loaded activated carbon, silver-loaded activated carbon fiber, ion exchange resin or medical stone. 4. The detachable flushing type multi-stage filtering water purification system according to claim 1, characterized in that a booster pump is further arranged between the first filtering unit and the water outlet pipeline. 5. The detachable flushing type multi-stage filtration water purification system according to claim 1, characterized in that, a sensor for detecting water quality TDS and water temperature is also arranged at the outlet of the water outlet pipe.