CN100469981C - Method and device for household quality-based water supply - Google Patents

Abstract

The invention discloses a domestic water supply method and device according to quality, which is a household water filtering device. Filtration is carried out as follows: use split-type microfiltration membrane filter to filter raw water to produce cleaning water and washing water; use interception activated carbon filter to filter part of washing water to produce cleaner drinking water; use split-type nanofiltration membrane filter to filter Cleaner drinking water produces drinking water. Since the first-stage filtration uses a split filter, the surface of the filter membrane is often washed by flowing water, which greatly prolongs the service life of the filter membrane. Extended service life of filter membranes means lower cost of producing water for drinking and washing. Due to the use of water supply by quality, all the concentrated discharge water is fully utilized. The use of the present invention provides the lowest cost and the most suitable water quality for different uses of the family, and realizes the process of producing pure and purified water with zero discharge in the family. At the same time, the membrane surface is washed with clean water in real time, so that the filter is not blocked and there is no secondary pollution.

Description

Method and device for household quality-based water supply

technical field

The invention discloses a household water supply method and device, which is a method and equipment for separating tap water into clean water, purified water and domestic miscellaneous water after filtering, and is a household water treatment method and equipment.

Background technique

Modern life has higher and higher requirements for domestic water. People pay great attention to the quality of water when drinking water, and have higher requirements for the taste of water. In order to fully protect human health, prevent the spread of epidemic diseases and meet the needs of beauty, corresponding requirements are put forward for the content of substances in bathing water. Therefore, various water treatment devices have appeared to remove impurities from ordinary water and make it into pure water for bathing or consumption.

At present, a large number of domestic pure water production devices usually use some rough filter elements such as activated carbon and PP cotton, and use the interception filtration method to absorb and rough filter some impurities in the water (commonly known as pretreatment), and then pass through the membrane. Separation technology is used for advanced processing to meet people's needs. However, in the pretreatment process, almost all of them use one inlet and one outlet to flow out relatively clean water, and a simple filtration method that traps impurities in the filter (hereinafter referred to as the retention filter in this article), resulting in filter Impurities retained in the filter will cause secondary pollution to the follow-up treatment. At the same time, the impurities retained in the filter will easily cause the inside of the filter to become dirty and blocked. Consumers can only use frequent cleaning or replacement of the filter element to ensure the normal use of the filter equipment. This wastes water resources on the one hand, increases use cost, and the convenience of using is greatly reduced simultaneously.

Although in the post-membrane separation process of ordinary household pure water equipment, the method of simultaneously discharging concentrated water and purified water can partially solve the problem of impurities remaining in the filtration process, but it also brings a large amount of concentrated water discharge. The serious problem of wasting water resources. Usually the ratio of concentrated water discharge to purified water utilization is 85:15. This kind of phenomenon should not happen for a country like China, which is not rich in water resources, to use water resources like this.

Under this premise, someone proposed the concept of so-called zero-discharge pure water production, that is, in the process of producing pure water, the concentrated discharge water should be discharged as little as possible, or the concentrated discharge water should be used as much as possible. Once this concept was put forward, it was widely recognized by the society.

But how to achieve the concept of zero emissions has a different approach. One way is to introduce the concentrated water in the membrane separation process into the initial inlet of the water treatment equipment for recycling treatment. First of all, this approach will not work in theory. Because of this, with the increase of water production, the concentration of impurities in the water body in the machine will increase rapidly, and eventually the machine will be blocked and stop working in a short period of time. Chinese patent 200410021696.2 (disclosure date: December 29, 2004, publication number: 1558049A) proposes a kind of quality-based water supply system, which is said to be used for household quality-based water supply. The main invention described in this invention is to add a concentrated water temporary storage buffer adjustment device similar to a water tank to the traditional water purification equipment. But actually this system is difficult to realize in the family. One of its reasons is that how much volume should the buffer adjustment device described therein be designed under the home use condition? The second is that its buffer device accommodates the flow of concentrated water into the downstream, which will affect the downstream water quality. Although this invention also proposes the method of adding auxiliary treatment to solve the problem of the impact on downstream water quality, how to solve the problem of impurities or concentrated water in the treatment process of the auxiliary treatment device? Is the secondary processing device itself a duplicate of the primary processing device?

The filter device used in the usual water supply is as follows: First, the tap water is roughly treated or pretreated through some simple filter devices such as PP cotton, activated carbon, ion exchange resin, etc., to ensure that it enters the high-precision processing device ( For example, the water quality before the membrane separation device) is better, reducing pollution in the high-precision treatment process and ensuring a longer service life of high-precision treatment equipment. But even under pretreatment conditions, the key technologies in high-precision treatment devices (such as membrane separation technology) still require concentrated water and purified water to be discharged at the same time. Especially nanofiltration membranes and reverse osmosis membranes, due to their small membrane pores below the nanometer level, a small amount of purified water must be discharged during the working process, and a large amount of concentrated water must be flushed and discharged from the membrane surface, otherwise the membrane surface will be easily drained. Pollution and clogging produce no water phenomenon (hereinafter referred to as a split filter that separates a fluid into two other fluids and flows out simultaneously). In this way, impurity interception in the pretreatment process is easy to block and secondary pollution, and a large amount of concentrated water is discharged in the post-membrane separation process, resulting in serious waste of water resources. This combination of water treatment has become a fixed trend, a habitual concept in people's minds. In order to make a breakthrough in making clean and healthy water at home, we must break this customary concept.

Contents of the invention

The object of the present invention is to provide a household water supply method and device, which divides household water into edible water, washing water and cleaning water. Divide the domestic water system into three systems: the drinking water system, the washing water system and the cleaning water system, and supply water separately. The device uses tap water as raw water to filter, uses a split filter to separate the tap water for the first time, obtains washing water and cleaning water, and separates part of the water flow from the washing water to reuse the retention filter and has higher precision. The split filter combination is further processed to obtain drinking water (the concentrated water of the higher precision split filter is combined with the pre-stage cleaning water and discharged together). According to the separated different water flow qualities (edible water, washing water and cleaning water), they are respectively supplied to the family's drinking water system, washing water system and cleaning water system. On the premise of making full use of water resources, the service life of the filter device is extended as much as possible, and the maintenance and replacement of filter elements are reduced.

The basic principle of the present invention is to divert rather than simply filter and intercept impurities, and mainly use membrane separation technology to perform high-level and medium-level treatment according to the requirements of different uses of domestic water such as drinking water and washing water. Use household cleaning water (toilet flushing, mopping the floor, watering flowers and greening, etc.) to flush the surface of the membrane to realize the sewage of the filter membrane and keep the surface of the membrane clean. This not only meets the working condition requirements of the membrane surface in the membrane separation process, but also avoids the waste of water resources in the discharge of concentrated water during the membrane separation process. At the same time, microfiltration membranes (or ultrafiltration membranes) are used to separate from the first stage, which solves the problem of one inlet and one outlet in the pretreatment process of current household pure and water purification equipment. Cleaner water flows out, and it is easy for impurities to remain in the filter. Dirty blockage and secondary pollution to subsequent processing. The present invention separates tap water, which is the same quality of influent water, into high-quality drinking water through the ingenious cooperation of the two-stage membrane separation technology, and three types of water, good-quality washing water and slightly lower-quality cleaning water, flow out, thus overcoming The current domestic water purification and purification equipment only focus on producing high-quality drinking water, and discharge impurities to pollute upstream or downstream domestic water, or retain impurities in the filter to cause dirty blockage and secondary pollution. Its important feature is that three kinds of water of different quality flow out simultaneously or alternately. Using the characteristics of domestic cleaning water that allows the water quality to be slightly lower than the tap water standard, the surface of the membrane is washed with clean water, which not only meets the working conditions of the membrane material, but also ensures water resources. The utilization rate reaches 100%, realizing the so-called zero emission.

The purpose of the present invention is achieved in this way: a household water supply method, which divides household water into three systems: cleaning water system, washing water system, and drinking water system, which is characterized in that raw water is filtered and supplied to three systems. Steps to use water for each system:

The raw water flows into the split microfiltration membrane filter, and part of the water washes the surface of the microfiltration membrane, so that no impurities remain in the filter and no secondary pollution, and the step of producing clean water;

The raw water flows into the split microfiltration membrane filter, and part of the water passes through the microfiltration membrane to generate washing water;

The step that the clean water flows out of the split microfiltration membrane filter and enters the clean water system;

The washing water flows out of the split-flow microfiltration membrane filter, and part of the washing water flows into the washing water system;

The wash water flows out of the split-flow microfiltration membrane filter, and part of the wash water enters the retention filter;

A step in which part of the washing water is filtered through a retention filter to produce cleaner drinking water;

Steps in which cleaner drinking water exits the retention filter;

Cleaner drinking water flows into the split-type nanofiltration membrane filter, and part of the water washes the surface of the nanofiltration membrane, so that no impurities remain in the filter and no secondary pollution, and the step of producing clean water;

Cleaner drinking water flows into the split nanofiltration membrane filter, and part of the water passes through the nanofiltration membrane to produce drinking water;

The step that the clean water flows out of the split nanofiltration membrane filter and enters the clean water system;

The drinking water flows out of the split-type nanofiltration membrane filter and enters the drinking water system.

The split microfiltration membrane filter can be replaced by a split ultrafiltration membrane filter; the split nanofiltration membrane filter can be replaced by a split reverse osmosis membrane filter or a split ultrafiltration membrane filter.

A household quality-separated water supply device, including a raw water inlet, is characterized in that it also includes: a cleaning water outlet, a washing water outlet, a drinking water outlet, a split-type microfiltration membrane filter, a retention filter, a split-type nano Membrane filter; the raw water inlet is connected to the water inlet of the split-type microfiltration membrane filter, the outlet of the membrane surface flushing water of the split-type microfiltration membrane filter is connected to the outlet of cleaning water, and the outlet of the split-type microfiltration membrane filter is connected to the interception The water inlet of the activated carbon filter is connected, the water outlet of the split microfiltration membrane filter is connected with the washing water outlet, the water outlet of the retention filter is connected with the water inlet of the split nanofiltration membrane filter, and the split nanofiltration The membrane surface flushing water outlet of the membrane filter is connected with the cleaning water outlet, and the filtration outlet of the shunt nanofiltration membrane filter is connected with the edible water outlet.

The split microfiltration membrane filter can be replaced by a split ultrafiltration membrane filter; the split nanofiltration membrane filter can be replaced by a split reverse osmosis membrane filter or a split ultrafiltration membrane filter; The filter membrane of the filter includes microfiltration membrane, ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane, and its membrane pore size can be selected and adjusted according to different needs.

The beneficial effects of the present invention are: because the first-stage filtration uses a split filter, the surface of the filter membrane is often scoured by flowing water, although the scour is intermittent, the service life of the filter membrane is greatly extended. Longer membrane life means lower costs for producing purified water. Due to the use of sub-system water supply by quality, all the concentrated discharge water can be fully utilized (through household cleaning water, such as flushing toilets, mopping the floor, watering flowers and greening, etc.). Due to the use of water supply by quality, the impurities retained in the process of making drinking water are discharged in time, so that the filter will not be blocked and secondary pollution will not be generated. The use of the present invention realizes all-round water supply for households with the most suitable water quality at the lowest cost. The concentrated discharge water is fully and reasonably used to achieve zero discharge in the small system of the family to produce pure water.

Description of drawings

Fig. 1 is the functional block diagram of the domestic water supply system that the present invention forms;

Fig. 2 is a schematic diagram of the filtration process principle of the present invention;

Fig. 3 is a schematic diagram of the appearance of a household water supply device for quality separation;

Fig. 4 is a schematic diagram of the interior of a household water supply device with different types of quality.

Detailed ways

Embodiment one:

Fig. 1 is a functional block diagram of a domestic water supply system composed of a household water supply method and device according to the present invention. In the figure: 1. Tap water supply system, 2. Raw water inlet of domestic household water supply device, 3. Household water supply device, 4. Drinking water outlet of household water supply device, 5. Household water supply device Washing water outlet, 6. Cleaning water outlet of household water supply device, 7. Household drinking water system, 8. Household washing water system, 9. Household cleaning water system.

General household water is nothing more than three purposes: water for drinking, washing vegetables, fruits, tableware and cooking, etc.; water for washing face, bathing, grooming, washing clothes, etc. that comes into contact with the body; flushing toilets , Mopping and watering flowers and other clean and sanitary water. According to these uses, this embodiment divides the domestic water into three small water systems, and supplies water of different qualities according to needs, forming a water supply system designed according to the characteristics of domestic water. The purpose of subdividing household water use is to find ways to use water rationally.

The characteristics of domestic domestic water are: in terms of water consumption, the consumption of drinking water is relatively small, and the consumption of bathing water and cleaning water is relatively large. In addition, household water is a process of intermittent use, and the single consumption is not large. In terms of water quality, the source of household water is generally tap water in cities and towns. The quality of the water source is relatively good and there are few impurities. However, there are different requirements for household water. Drinking water is required to meet the standard of direct drinking, and the water must only contain very few impurities or pure water. Bathing water is a kind of clean water, which requires a lower level than drinking water, and also requires good quality to ensure the health of the human body. The requirements for cleaning water are relatively low, and it is enough to meet the domestic miscellaneous water standard. Cleaning water allows the use of concentrated water discharged during the production of drinking water and washing water. According to these characteristics, a set of methods for filtering tap water suitable for household use is specially designed, using the cleaning, sewage and intermediate process water generated in the process of filtering water as output of different quality water and sent to different water systems. Fully utilized, the zero discharge of pure water production is realized. The invention overcomes the problem that the intercepted impurities are easy to cause dirty blockage and secondary pollution during the filtration process of the existing domestic pure and purified water equipment. It solves the problem of wasting water resources by discharging concentrated water during the use of existing pure and purified water equipment in the family. It meets the all-round needs of family consumption, washing and cleaning water.

Fig. 2 is a schematic diagram of the principle of the filtering process in this embodiment. The serial numbers in the figure represent: 10. Divided microfiltration membrane filter water inlet, 11. Divided microfiltration membrane filter, 12. Divided microfiltration membrane filter membrane surface flushing water outlet, 13. Microfiltration membrane, 14 .Split type microfiltration membrane filter filter water outlet, 15. Retention type filter, 16. Water outlet of retention type filter, 17. Water inlet of split type nanofiltration membrane filter, 18. Split type nanofiltration membrane filter , 19. Divided nanofiltration membrane filter membrane surface flushing water outlet, 20. Nanofiltration membrane, 21. Divided nanofiltration membrane filter filter water outlet, 22. The filter element of the retention filter, 23. Retention type Filter water inlet.

According to the characteristics of small amount of drinking water and intermittent use in domestic water, this embodiment breaks through the traditional concept of using interception filter first and then using split filter, that is, it breaks through the concept of pre-treatment and post-treatment, and The method of using a split-type microfiltration membrane filter first, then a cut-off filter, and then a split-type nanofiltration membrane filter divides the water quality of household water into cleaning water, bathing water, and drinking water. Make full use of water resources and achieve zero discharge. The reason for this is that the raw water used to make purified water at home is tap water with less impurities and better water quality. At the same time, there is clean water to wash the membrane surface of the split microfiltration membrane filter. The microfiltration membrane is fully capable of first-stage filtration. However, ordinary pretreatment devices cannot automatically clean the filter element, and the trapped impurities will cause dirty blockage and secondary pollution. However, the activated carbon filter element used in the interception filter has the effect of removing the peculiar smell in the water, and it is also inappropriate to completely abandon it, so it is placed after the split microfiltration membrane filter. Since the cut-off filter is placed behind the split-flow microfiltration membrane filter, its influent water quality is much better than that of raw water. Although the cut-off filter in this embodiment does not have the function of automatically cleaning the filter element, its service life can be very long. The cut-off filter can use various filter elements, such as activated carbon filter elements, PP cotton filter elements or ion exchange resin filter elements, and a combination of two or more filter elements. In this embodiment, an activated carbon filter element is used, and two kinds of activated carbon filter elements are used, one is a granular activated carbon filter element, and the other is a block activated carbon filter element.

The filtration process shown in Figure 2 is: the raw water flows in from the raw water inlet, enters the water inlet of the split-flow microfiltration membrane filter through the pipeline, and enters the split-flow microfiltration membrane filter. A part of the water flows through the microfiltration membrane in the direction of the big arrow A in the figure. The membrane surface of the filter membrane lifts up the impurities on the membrane surface, and flows through the membrane surface flushing water outlet of the shunt microfiltration membrane filter to the cleaning water outlet, and flows out as cleaning water for the household cleaning water system. It is the concentrated discharge water for cleaning the microfiltration membrane. Part of the water passes through the microfiltration membrane in the direction of the small arrow a in the figure, and flows out from the filter outlet of the split microfiltration membrane filter. This part of water is divided into two parts, and one part is used as washing water to flow to the washing water outlet for use in the household washing water system. , and the other part flows into the intercepting filter as the water inlet for further treatment, and enters the intercepting filter. Water flows out from the water outlet of the retention filter, flows to the water inlet of the split nanofiltration membrane filter, and enters the split nanofiltration membrane filter. A part of the water flows through the membrane surface of the nanofiltration membrane in the direction of the big arrow B in the figure, lifts up the impurities on the membrane surface, and flows through the membrane surface flushing water outlet of the split-flow nanofiltration membrane filter to the cleaning water outlet, as The cleaning water flows out for the domestic cleaning water system. This part of the water is the concentrated discharge water for cleaning the nanofiltration membrane. Part of the water passes through the nanofiltration membrane in the direction of the small arrow b in the figure, flows out from the filter outlet of the split nanofiltration membrane filter, and flows to the drinking water outlet for use in the domestic drinking water system.

The first stage of filtration uses the microfiltration membrane filter to take advantage of the characteristics of household water supply. The raw water used for household food and water is tap water. The quality of tap water is not far from the requirements of household food and water, and usually has reached a certain level. The standard of cleanliness can be filtered with a relatively fine filter such as a split-flow microfiltration membrane filter without clogging. The second stage uses an intercepting activated carbon filter mainly to remove the chlorine taste in the tap water. The third stage uses a split-flow nanofiltration membrane filter to filter all harmful substances in the water.

In this embodiment, the cleaning water with large water consumption in the household is used as the water to keep the membrane surface clean in the shunt type filter. Because the water consumption is large, the filter membrane surface is often washed to keep the membrane surface clean and prolong the use of the filter membrane. life. It is generally believed that the water flow on the membrane surface of the shunt filter must keep flowing, so that it can work continuously without clogging the filter membrane, and it is impossible to use continuous water for household cleaning. How to solve this contradiction? This embodiment utilizes the characteristics of domestic water: because the process of domestic water use is intermittent, the maximum continuous use of bath water will not exceed 1 ton, and when tap water is the water source, filtration with microfiltration membranes is not enough to block the membrane surface , there will always be people who use cleaning water afterwards, and the membrane surface must be washed, which will not affect subsequent use. The amount of drinking water in the household is less, and the amount of continuous use is absolutely below 50 kg each time. At the same time, the tap water is pretreated by microfiltration membrane and activated carbon, and the quality of the influent water is better. When the clean water is in use, the concentration of the nanofiltration membrane will not be affected. water discharge. When the cleaning water is not used temporarily, such a small amount of drinking water will not pollute the membrane surface. When the cleaning water is used, the membrane surface will be washed and restored. Moreover, the amount of household cleaning water is much greater than that of drinking water. Although it is also intermittent, the daily amount is enough to keep the filter membrane surface clean.

Embodiment two:

This embodiment is the same as Embodiment 1, except that the first-stage filtration uses a split-flow ultrafiltration membrane filter.

Embodiment three:

This embodiment is the same as the first embodiment, except that the third-stage filtration uses a split-flow reverse osmosis membrane filter.

Embodiment four:

This embodiment is a specific implementation of a household water supply device with quality separation:

Fig. 3 and Fig. 4 are the external schematic diagram and the internal schematic diagram of the household quality water supply device of this embodiment. In the figure: 24. shell, 25. bucket. This is a household built-in sub-quality water supply device, which can be installed under the operating table in the kitchen, and the bucket in it is used to store the purified water produced.

The working principle of this embodiment is shown in Figure 2. In this embodiment, the elements are connected in this way: the raw water inlet is connected to the water inlet of the split-flow microfiltration membrane filter, and a low-pressure switch can be added to control the water flow if necessary. The flushing water outlet of the membrane surface of the split-flow microfiltration membrane filter is connected with the cleaning water outlet. The outlet of the split-type microfiltration membrane filter divides the water filtered by the microfiltration membrane filter into two parts through a tee and a pipeline, one part is connected with the water inlet of the retention filter, and the other part is connected with the washing water outlet. The water outlet of the intercepting filter is connected with the water inlet of the split-flow nanofiltration membrane filter through a pipeline. If necessary, a booster pump and a solenoid valve can be added to increase the water pressure and control the water flow and flow direction. The membrane surface flushing water outlet of the split-flow nanofiltration membrane filter is connected to the cleaning water outlet through a pipeline, and the waste water ratio can be increased if necessary (a device that adjusts the ratio of the split-flow filter to rinse the membrane surface water and filtered water), Check valve and other equipment. The filtered water outlet of the split-flow nanofiltration membrane filter is connected with the drinking water outlet, and a high-pressure valve can be added to control the water flow if necessary.

The working process of this embodiment is: the raw water flows in from the raw water inlet, enters the water inlet of the split-type microfiltration membrane filter through the pipeline and enters the split-flow microfiltration membrane filter, and a part of the water flows through the microfiltration membrane in the direction of the big arrow A in the figure The membrane surface will lift up the impurities on the membrane surface, and flow through the membrane surface flushing water outlet of the shunt microfiltration membrane filter to the cleaning water outlet, and flow out as cleaning water to be used in the household cleaning water system. This part of the water is used for cleaning Concentrated discharge water from microfiltration membranes. Part of the water passes through the microfiltration membrane in the direction of the small arrow a in the figure, and flows out from the filter outlet of the split microfiltration membrane filter. This part of water is divided into two parts, and one part is used as bathing water to flow to the washing water outlet, which is used by the household washing water system. , and the other part flows into the interception filter as the water inlet for further treatment, and enters the interception filter. The retention type filter that uses in the present embodiment has used the filter of two kinds of activated carbon filter cores that are connected in series, and a kind of is the filter of granular activated carbon filter core, and a kind of is the filter of block activated carbon filter core . Water flows out from the water outlet of the intercepting activated carbon filter, flows to the water inlet of the split nanofiltration membrane filter (if necessary, a booster pump and a solenoid valve, etc. are added), and enters the split nanofiltration membrane filter. A part of the water flows through the membrane surface of the nanofiltration membrane in the direction of the big arrow A in the figure, lifts up the impurities on the membrane surface, and flows through the membrane surface flushing water outlet of the split-flow nanofiltration membrane filter to the cleaning water outlet (necessary When increasing the waste water ratio and check valve, etc.), it flows out as clean water, and this part of water is the concentrated discharge water for cleaning the nanofiltration membrane. Part of the water passes through the nanofiltration membrane in the direction of the small arrow a in the figure, flows out from the filter outlet of the split nanofiltration membrane filter, and flows through the pipeline to the drinking water outlet (if necessary, add a high-pressure switch, water storage container and liquid control device, etc. ), for family consumption.

Fig. 3 is a schematic diagram of the appearance of a domestic water supply device by quality separation. In this embodiment, a bucket for filling edible water is used, and a water pipe for outputting edible water is also provided. Fig. 4 is a schematic diagram of the interior of this embodiment, in which the pipeline is only schematically drawn, which is actually much more complicated. In this embodiment, in order to reduce the volume and increase the water volume, 14 split-flow microfiltration membrane filters are used in parallel. The retention filter uses two types of activated carbon filter elements. One filter element is a granular activated carbon filter, and the other filter element is a block activated carbon filter. Two intercepting activated carbon filters are used in series. It is also possible to use PP cotton filter core or ion exchange resin filter core, and use two or more of the above filter cores in combination. A split-flow nanofiltration membrane filter was used. Through such a combination, tap water is used as raw water to supply normal purposes such as family life, food, washing, and cleaning. Generally, all filters can work normally for more than one year without replacing the filter element, which effectively reduces the cost of making pure water.

Embodiment five:

This embodiment is basically the same as Embodiment 4, except that the split-flow microfiltration membrane filter is replaced by a split-flow ultrafiltration membrane filter.

Embodiment six:

This embodiment is basically the same as Embodiment 4, except that the split-flow nanofiltration membrane filter is replaced by a split-flow reverse osmosis membrane filter.

Raw water mentioned in this manual means: raw water for making pure water; washing water is water for washing face, bathing and other bathing; cleaning water is water for flushing toilets, mopping the floor, watering flowers and greening; A kind of process water in the process; drinking water is the water used for drinking and cooking directly. The above is only an illustration, not a definition.

Claims (7)

1. household quality separation water-supply method, described method is divided into three systems with domestic water: the cleaning water system, the scouring water system, the drinkable water system is characterized in that former water is filtered the step of three system waters of supply:

Former water flows into the shunting microporous filtration, and part water flushing micro-filtration membrane surface makes and do not retain the impurity non-secondary pollution in the strainer, produces the step of cleaning water;

Former water flows into the shunting microporous filtration, and part water passes the step that micro-filtration membrane produces scouring water;

Cleaning water flows out shunting microporous filtration, the step that enters the cleaning water system;

Scouring water flows out the shunting microporous filtration, and the part scouring water flows into the step of scouring water system;

Scouring water flows out the shunting microporous filtration, and the part scouring water enters the step of holding back type filter;

The part scouring water filters the step that produces than clean drinking water through holding back type filter;

Flow out the step of holding back type filter than clean drinking water;

Flow into shunting NF membrane strainer than clean drinking water, part water flushing NF membrane surface makes and does not retain the impurity non-secondary pollution in the strainer, produces the step of cleaning water;

Flow into shunting NF membrane strainer than clean drinking water, part water passes the step that NF membrane produces drinkable water;

Cleaning water flows out shunting NF membrane strainer, the step that enters the cleaning water system;

Drinkable water flows out shunting NF membrane strainer, the step that enters the drinkable water system.

2. a kind of household quality separation water-supply method according to claim 1 is characterized in that, described shunting microporous filtration can replace with shunting ultrafiltration membrance filter device.

3. a kind of household quality separation water-supply method according to claim 1 is characterized in that, described shunting NF membrane strainer can replace with shunting reverse osmosis membrane filt or shunting ultrafiltration membrance filter device.

4. a household quality separation water-supply device comprises raw water inlet, it is characterized in that, also comprises: the cleaning water delivery port, and the scouring water delivery port, the drinkable water delivery port, the shunting microporous filtration is held back the formula strainer, shunting NF membrane strainer; Raw water inlet is connected with the water inlet of shunting microporous filtration, shunting microporous filtration face flushing water delivery port is connected with the cleaning water delivery port, the shunting microporous filtration filters out the mouth of a river and is connected with the water inlet of holding back the formula strainer, the shunting microporous filtration filters out the mouth of a river and is connected with the scouring water delivery port, the delivery port of holding back the formula strainer is connected with the water inlet of shunting NF membrane strainer, the face flushing water delivery port of shunting NF membrane strainer is connected with the cleaning water delivery port, and the mouth of a river that filters out of shunting NF membrane strainer is connected with the drinkable water delivery port.

5. a kind of household quality separation water-supply device according to claim 4 is characterized in that, the shunting microporous filtration replaces with shunting ultrafiltration membrance filter device.

6 a kind of household quality separation water-supply devices according to claim 4 is characterized in that, shunting NF membrane strainer replaces with shunting reverse osmosis membrane filt or shunting ultrafiltration membrance filter device.

7. a kind of household quality separation water-supply device according to claim 4 is characterized in that the employed filtering material of holding back the formula strainer is activated carbon or PP cotton or ion exchange resin.

8. a kind of household quality separation water-supply device according to claim 4 is characterized in that the employed filtering material of holding back the formula strainer is the combination of activated carbon and two kinds of different filtering materials of ion exchange resin.

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