WO2015131422A1

WO2015131422A1 - Intense pulsation micro wastewater discharge water purification system

Info

Publication number: WO2015131422A1
Application number: PCT/CN2014/074159
Authority: WO
Inventors: 杨瀚
Original assignee: 深圳澳特弗科技有限公司
Priority date: 2014-03-05
Filing date: 2014-03-27
Publication date: 2015-09-11

Abstract

Disclosed is an intense pulsation micro wastewater discharge water purification system, comprising a water intake T-joint (1), a front-end filter set, a blower pump (13), a reverse osmosis membrane filter (15), and a rear-end activated carbon filter (19) connected in turn via a pipeline, an outlet of the rear-end activated carbon filter being connected to a water outlet (20) via a high-pressure switch (18), and an outlet of the reverse osmosis membrane filter being simultaneously connected to a water storage pressure tank (4) via a pipeline, wherein the reverse osmosis membrane filter outlet is provided with a wastewater discharge pipeline, and a pulsed electromagnetic valve (14) is provided on the pipeline. The water storage pressure tank backwashes a micro-amount of pure water via a pipeline and a one-way valve (22) to a front end of the reverse osmosis membrane filter (15) for soaking the reverse osmosis membrane after water production is completed. The present invention greatly increases the utilisation rate of raw water to 75% or more by the two measures of rapidly and momentarily pulsing drainage to flush the reverse osmosis membrane, and backwashing pure water for flushing and soaking to protect the reverse osmosis membrane.

Description

Strong pulse micro wastewater discharge water purification system

Technical field

The invention relates to a water purifier, in particular to a strong pulse micro wastewater discharge water purification system.

Background technique

Most of China's cities use Class III surface water and rural areas mainly use Class IV groundwater as drinking water source. With the increase of pollution, the two insects (Jia diflagellate, Cryptosporidium), blue-green algae, heavy metals exceeding the standard, etc. Serious threat to the safety of drinking water in urban and rural areas. Therefore, surface water and groundwater must be purified before they can be used as drinking water. At present, the core of domestic and commercial drinking water treatment technology is mainly membrane filtration technology. One of them is ultrafiltration membrane filtration, the filtration pore size is 0.01 micron, which can remove all turbid substances (such as sediment, rust, etc.), pathogenic microorganisms (such as parasites, bacteria, viruses, etc.), and can also remove most of them. Large-molecule organic matter, without electricity, does not produce waste water, is more suitable for cities with better water quality in southern China, but cannot remove many harmful or carcinogenic substances such as organic compounds, radioactive cesium, arsenic, and heavy metals such as lead and mercury. Ions, in the northern regions with poor water quality and the vast rural areas, cannot meet the needs of safe and healthy drinking water treatment. The other is reverse osmosis membrane filtration. The filter pore size is 0.0001 micron, which can completely remove all harmful substances in water, and only retain water molecules to produce pure water. It has wide applicability and is the main force of water treatment in China's urban and rural areas. However, the pure water machine using reverse osmosis membrane needs to discharge a large amount of wastewater (concentrated water) in the process of producing pure water because of the working principle of reverse osmosis membrane. Due to the influence of water temperature and water quality, a pure water needs to be discharged. 3-5 parts of wastewater. The status quo of this amazing output of wastewater is contrary to the scientific development of the country and the need to save energy and reduce consumption in a conservation-oriented society.

Although many people in China have reused the wastewater discharged from traditional water purifiers, the quality of the recovered water and the way of recycling have not been satisfactory. In the past two years, some water purifier manufacturers have introduced the 'small wastewater' pure water machine. The principle is to recycle the waste water discharged from the water production process back to the front end of the reverse osmosis membrane, so that the reverse osmosis membrane can be operated in a high concentration wastewater environment for a long time. The quality of pure water production is reduced, and the fouling speed of the reverse osmosis membrane is also accelerated, so that the service life of the reverse osmosis membrane is greatly shortened. Practice has made us realize that the 'water-saving' ordinary ultrafiltration machine makes it difficult to cover all areas of China's complex water quality because of its limitations, and the 'frozen water' RO pure water machine is less suitable for 'water shortage'. China's large-scale promotion. Therefore, it is necessary to carry out 'water saving technology' innovation and product innovation.

Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to provide a strong pulse micro-wastewater discharge water purification system in view of the above-mentioned drawbacks of the prior art.

The strong pulse micro wastewater discharge water purification system designed by the invention comprises: a water inlet tee connected in turn through a pipeline, a pre-filter group, a booster pump, a reverse osmosis membrane filter and a post-activated carbon filter, wherein the outlet of the rear activated carbon filter is connected to the water outlet through a high-pressure switch, and the inlet is connected to a water storage pressure tank through a pipeline. Wherein said The outlet of the reverse osmosis membrane filter is provided with a waste water discharge pipe, and a pulse solenoid valve is arranged on the pipe; the water storage pressure tank returns a trace of pure water through a pipe and a check valve to the front end of the reverse osmosis membrane filter for After the water is completed, the reverse osmosis membrane is immersed.

The pre-filter set includes a PPF filter filter, an activated carbon filter filter, and a PPF filter filter that are sequentially connected.

In an embodiment The front end of the high voltage switch is provided with a one-way valve. A water flow sensor is disposed between the reverse osmosis membrane filter and the rear activated carbon filter. A four-sided valve is disposed between the booster pump and the reverse osmosis membrane filter. A water inlet solenoid valve is disposed between the PPF filter and the activated carbon filter.

Compared with the prior art, the present invention has the following beneficial effects:

1 The invention adopts two measures of rapid transient pulse discharge flushing reverse osmosis membrane, pure water reflux washing and immersion protection reverse osmosis membrane, and the pure water machine is ensured in the case of ensuring high quality pure water output without damaging the reverse osmosis membrane. The ratio of wastewater to pure water can be greatly increased from the wastewater of ordinary water machine 3: pure water 1 to wastewater 1: pure water 3 or more (depending on the water quality, wastewater 1: pure water 6 or more), the raw water utilization rate is less than 25% has increased significantly to over 75%.

2. The invention adopts a non-consumption bistable pulse electromagnetic valve and a large flow reverse osmosis membrane, and can realize a pure water machine without using a municipal power source or a booster pump in urban and rural areas where the tap water pressure is higher than 0.2 MPa. Under the condition of no electricity, micro-waste water discharges pure water, and in the case of ensuring water quality safety, it is more energy-saving and emission-reducing, which is in line with the requirements of building a conservation-oriented society in China.

DRAWINGS

Figure 1 is a general pure water mechanism water flow chart;

Figure 2 is a flow chart of water production of a partial wastewater reflux pure water machine;

3 is a schematic diagram of a system according to an embodiment of the present invention;

Figure 4 is a schematic illustration of a system in accordance with a second embodiment of the present invention.

detailed description

The invention will now be described in detail in conjunction with the drawings and embodiments.

The reverse osmosis membrane (RO membrane) water purification technology has a filtration precision of up to 0.0001 μm, which can almost filter out all impurities and salts other than water. However, the negative effect of the high-precision RO membrane is that it is easily filthy. In order to prevent the RO membrane from being fouled and to ensure the patency of the membrane during the RO membrane production process, the RO membrane of the RO pure water machine must be produced while producing pure water. Ensure that a sufficient amount of raw water flushes the surface of the RO membrane, so a large amount of wastewater is generated. The recommended raw water utilization rate of RO membrane produced by the famous Dow company in the United States is 15%. In the country, the pure water machine manufacturers use more Korean 'Shihan film', Japan 'Toray film' and domestic 'Huitong film', etc., the recommended raw water utilization rate is also about 25%.

1 shows a water purification system in the prior art, including: a water inlet tee connected in series through a pipe; Pre-filter group (composed of PPF filter element 8, activated carbon filter 10 and PPF filter 11 connected in sequence), booster pump 13, reverse osmosis membrane filter 15, high pressure switch 18, post-activated carbon filter The rear activated carbon filter outlet is connected to the water outlet 20, such as a faucet, and the high pressure switch 18 outlet is simultaneously connected to a water storage pressure tank 4 through a pipe.

As shown in Fig. 1, the water making process of the ordinary pure water machine is that the pressurized water is filtered by the reverse osmosis membrane and then discharged from the central pipe of the membrane through the pure water end of the reverse osmosis membrane filter, and the waste water end maintains the uninterrupted wastewater discharge. The wastewater is discharged by a constant flow wastewater proportional valve 16, and the waste water is discharged after the accumulation of the wastewater for a period of time to ensure the accumulation of dirt on the membrane. This water production process, the raw water utilization rate is about 25%.

As shown in Fig. 2, the “small wastewater” pure water mechanism water flow of some domestic manufacturers adds a wastewater reflux device to the process of the ordinary pure water machine, and introduces part of the wastewater into the inlet of the reverse osmosis membrane filter 15. The constant-flow wastewater proportional valve 16 is removed, and the electromagnetic discharge valve 17 is used for intermittent sewage discharge, so that the discharged waste water is recycled, the waste water discharge is reduced, the raw water utilization rate is increased to 50% or higher, but the reverse osmosis membrane is becoming more and more The high-concentration wastewater environment can not guarantee the quality of pure water production, and the damage to the reverse osmosis membrane is large, the fouling of the membrane is aggravated, and the service life is greatly shortened.

3 is a water purification system according to an embodiment of the present invention, comprising: a water inlet tee connected in series through a pipeline; The pre-filter group, the booster pump 13, the reverse osmosis membrane filter 15, the post-activated carbon filter 19, the rear activated carbon filter outlet are connected to the water outlet 20 through the high-pressure switch 18, and the outlet of the reverse osmosis membrane filter is simultaneously passed. The pipe is connected to a water storage pressure tank 4. among them, The reverse osmosis membrane filter outlet is provided with a waste water discharge pipe, and the pipe is provided with a pulse solenoid valve 14; the water storage pressure tank 4 returns a trace of pure water through a pipe and a check valve 22 to the front end of the reverse osmosis membrane filter 15 for After the water is completed, the reverse osmosis membrane is immersed.

As shown in FIG. 3, the water-making process proposed by the present invention removes the constant-flow wastewater proportional valve, and the ordinary wastewater solenoid valve is switched to the pulse solenoid valve 14 with the opening and closing time within 0.1 second, and the intermittent pulse discharge is performed. The rapid opening and closing of the solenoid valve produces a rapid flow of water to instantaneously flush the surface of the reverse osmosis membrane, rapidly removing the dirt deposit accumulated on the membrane, and achieving the purpose of effectively cleaning the reverse osmosis membrane with little flushing water consumption, thereby greatly reducing the generation of wastewater. Compared with the ordinary pure water machine, the rapid instantaneous pulse discharge of the system of the present invention, the ratio of waste water to pure water can be greatly increased from waste water 3: pure water 1 to waste water 1: pure water 3 or more (distillation can be done according to different water quality 1 : Pure water 6 or more), the raw water utilization rate has been greatly increased from less than 25% to more than 75%.

Among them, the specific flushing operation time is as follows: remove the solenoid valve opening and closing time, each flushing time is between 0.1 seconds and 1 second (0.3 seconds - 0.5 seconds is good) to generate a rapid and strong water flow, a single flushing time Too short can not completely remove the dirt deposit on the membrane. If the time is too long, it will not produce strong water flow, waste water and the washing effect is not good. The interval between flushes is between 15 seconds and 45 seconds. This interval can be used as a tool to adjust the ratio of pure water to wastewater. In areas with good water quality or when customers require ultra-low wastewater discharge, the interval can be extended to save water. According to the test of continuous operation to produce pure water of more than 10 tons, in the area where the raw water TDS value is less than 500, the effect of pure water 5: wastewater 1 can be achieved and the reverse osmosis membrane does not exhibit a significant decrease in the discharge water flow rate. In areas where the raw water TDS value is less than 300, the effect of pure water 6: wastewater 1 can be achieved, or even higher. In this way, in the southern regions where China's water quality is better, it is possible to increase the output of pure water, lower the wastewater discharge, and save a lot of valuable water sources in the case of large-scale use.

As shown in FIG. 3, the present invention adds a pure water reflux device, and a water pipe is separated from the outlet of the external pressure tank 4 or the built-in filter cartridge type pressure tank of the straight drink machine, and the pure water is returned to the reverse osmosis membrane filter through the check valve 22. At the front end of the 15th, after the water is finished, the pure water is sent to the reverse osmosis membrane filter to soak the reverse osmosis membrane. At the same time, a check valve 5 is added at the front end of the high-pressure switch 18 to prevent the booster pump from frequently starting due to the pressure loss of the high-pressure switch when the pure water is returned after the water is completed. The principle of increasing the reflux device is: when the reverse osmosis membrane is rapidly and instantaneously pulsed, the wastewater ratio is significantly decreased, but the concentrated water accumulated at the sewage discharge end of the reverse osmosis membrane is more, and the TDS value is increased significantly (especially the region where the raw water TDS value is high). Or it is more obvious when the raw water is used up to 75% or more.) After the production of water has stopped producing water for a period of time, the principle of static permeation of the reverse osmosis membrane will make the TDS value of the pure water end water high, which is not conducive to the production of high quality pure water. Through the pure water reflux device, after the water is finished, the reverse osmosis membrane is washed and immersed through the clean pure water, and the TDS value of the wastewater end is significantly decreased, the possibility of penetration to the pure water end is greatly reduced, and the reverse osmosis membrane is also protected. Compared with the 'small wastewater' pure water machine whose other wastewater is returned to the front end of the reverse osmosis membrane to save water, the service life of the reverse osmosis membrane is not shortened but extended, and the high-quality output of pure water is more secure.

Figure 4 shows a second embodiment of the invention. In this embodiment, a water flow sensor 7 can be added to the pure water outlet end, and a four-sided valve 6 is added to the front end of the reverse osmosis membrane filter 15 to control the waterway system, and the water inlet solenoid valve and the sewage electromagnetic discharge. The valves use non-power-consuming pulse solenoid valves and large-flow reverse osmosis membranes. In urban and rural areas where the tap water pressure is higher than 0.2 MPa, the municipal wastewater can be used without a booster pump to achieve micro-waste water in the pure water machine without electricity. Emission of pure water, more energy-saving emission reduction, in line with China's requirements for building a conservation-oriented society.

The above embodiments are merely illustrative of specific embodiments of the invention. It is to be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

A strong pulse micro wastewater discharge water purification system, comprising: a water inlet tee (1) connected in turn through a pipeline, a pre-filter group, a booster pump (13), a reverse osmosis membrane filter (15) and a post-activated carbon filter (19), the post-activated carbon filter outlet passing through the high-pressure switch (18) and the water outlet ( 20) Connecting, the outlet of the reverse osmosis membrane filter is simultaneously connected to a water storage pressure tank (4) through a pipe. Characterized by the The outlet of the reverse osmosis membrane filter is provided with a waste water discharge pipe, and a pulse solenoid valve (14) is arranged on the pipeline; the water storage pressure tank is refluxed through a pipeline and a check valve (22) to the reverse osmosis membrane for filtration. The front end of the device (15).
A water purification system according to claim 1, wherein a check valve (5) is disposed at the front end of said high pressure switch (18).
A water purification system according to claim 1, wherein said pre-filter group comprises a PPF filter cartridge (8), an activated carbon filter cartridge (10) and a PPF cartridge filter (11) which are sequentially connected. .
A water purification system according to claim 1, characterized in that a water flow sensor (7) is provided between the reverse osmosis membrane filter (15) and the rear activated carbon filter (19).
A water purification system according to claim 1, wherein a four-sided valve (6) is provided between said booster pump (13) and said reverse osmosis membrane filter (15).
A water purification system according to claim 1, characterized in that a water inlet solenoid valve (9) is provided between the PPF filter (8) and the activated carbon filter (10).
A water purification system according to claim 1, characterized in that said booster pump (13) is connected to a transformer (12).
The water purification system according to claim 1, wherein said pulse solenoid valve (14) has an opening and closing time of 0.1 second.
The water purification system according to claim 1, wherein the ratio of the pulsed sewage to the pure water is greater than 1 to 3.
A water purification system according to claim 1, wherein said pulse solenoid valve (14) is flushed between 0.1 second and 1 second each time, and each flush interval is between 15 seconds and 45 seconds. .