CN103803736B - Strong-pulse micro-wastewater emission and purification system - Google Patents

Abstract

The invention discloses a strong pulse micro-wastewater discharge water purification system, comprising: a water inlet tee (1), a pre-filter group, a booster pump (13), a reverse osmosis membrane filter (15) connected sequentially through pipelines ), a rear activated carbon filter (19), the outlet of the rear activated carbon filter is connected to the water outlet (20) through a high-pressure switch (18), and the outlet of the reverse osmosis membrane filter is connected to a water storage pressure tank (4) through a pipeline at the same time connection, wherein, the outlet of the reverse osmosis membrane filter is provided with a waste water discharge pipe, and a pulse solenoid valve (14) is provided on the pipe; The front end of the pure water to the reverse osmosis membrane filter (15) is used for soaking the reverse osmosis membrane after water production is completed. In the present invention, the utilization rate of raw water is greatly increased to more than 75% through the two measures of fast instantaneous pulse blowdown flushing of the reverse osmosis membrane and pure water reflux flushing and immersion protection of the reverse osmosis membrane.

Description

A 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 cities in my country use Class III surface water, and rural areas mainly use Class IV groundwater as their drinking water source. With the intensification of pollution, problems such as two insects (Giardia flagella, Cryptosporidium), blue-green algae, and heavy metals exceeding the standard, etc., Serious threat to urban and rural drinking water safety. 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, with a filter pore size of 0.01 microns, 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 the Macromolecular organic matter does not require electricity and does not produce waste water. It is more suitable for cities with better water quality in southern China, but it cannot remove organic compounds, radioactive radon, arsenic and other harmful or carcinogenic substances in water, as well as heavy metals such as lead and mercury. Ions, in the northern regions and vast rural areas where the water quality is relatively poor, cannot meet the needs of safe and healthy drinking water treatment. The other is reverse osmosis membrane filtration, with a filter pore size of 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 vast urban and rural areas. However, due to the working principle of the reverse osmosis membrane, the pure water machine with reverse osmosis membrane needs to discharge a large amount of waste water (concentrated water) in the process of producing pure water. Affected by water temperature and water quality, a piece of pure water needs to be discharged. 3-5 parts of waste water. The current situation of producing astonishing waste water deviates from the domestically advocated scientific development and the "energy saving and consumption reduction" requirements of building a conservation-oriented society.

Although many people in China reuse the wastewater discharged from traditional water purifiers for a second time, the water quality and recycling methods of this recycling are still not satisfactory. In the past two years, some water purifier manufacturers have also launched "less waste water" pure water machines. The principle is to return the waste water discharged from the water production process to the front end of the reverse osmosis membrane for recycling, so that the reverse osmosis membrane can operate in a high-concentration waste water environment for a long time. The quality of the pure water output 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 is difficult to cover various areas of China with complex water quality due to its use limitations, and the "water-consuming" RO pure water machine is even less suitable for "water-scarce" areas. Widespread promotion in China. Therefore, "water-saving technology" innovation and product innovation must be carried out.

Contents of the invention

The purpose of the present invention is to provide a strong pulse micro-wastewater discharge water purification system aiming at the defects in the above-mentioned prior art.

The strong pulse micro-wastewater discharge water purification system designed by the present invention includes: a water inlet tee, a pre-filter group, a booster pump, a reverse osmosis membrane filter and a post-installed activated carbon filter connected by pipelines sequentially. The outlet of the active carbon filter is connected to the water outlet through a high-pressure switch, and the inlet is connected to a water storage pressure barrel through a pipeline, wherein the outlet of the reverse osmosis membrane filter is provided with a waste water discharge pipeline, and the pipeline is provided with a pulse solenoid valve; The water storage pressure barrel returns a small amount of pure water to the front end of the reverse osmosis membrane filter through a pipeline and a one-way valve for soaking the reverse osmosis membrane after the water production is completed.

The pre-filter group includes a PPF filter element filter, an activated carbon filter element filter and a PPF filter element filter connected in sequence.

In one embodiment, a check valve is provided at the front end of the high pressure switch. A water flow sensor is arranged between the reverse osmosis membrane filter and the post activated carbon filter. A four-way valve is arranged between the booster pump and the reverse osmosis membrane filter. A water inlet electromagnetic valve is arranged between the PPF filter and the active carbon filter.

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

1. The present invention adopts the two measures of rapid and instantaneous pulse blowdown flushing of the reverse osmosis membrane and pure water reflux flushing and soaking protection of the reverse osmosis membrane to ensure the high-quality output of pure water without damaging the reverse osmosis membrane. The ratio of waste water to pure water can be greatly increased from waste water 3: pure water 1 of ordinary pure water machines to waste water 1: pure water 3 or more (according to different water quality, waste water 1: pure water 6 or more can be achieved), and the utilization rate of raw water has never been higher. From 25% to over 75%.

2. The present invention adopts a bistable pulse solenoid valve that does not consume electricity and a large-flow reverse osmosis membrane. In urban and rural areas where the water pressure of tap water is higher than 0.2 MPa, the pure water machine can be realized without municipal power supply or booster pump. Under the condition of no electricity, the discharge of micro-wastewater produces pure water. Under the condition of ensuring the safety of water quality, it can achieve energy saving and emission reduction, which meets the requirements of building a conservation-oriented society in my country.

Description of drawings

Fig. 1 is the water flowchart of common pure water mechanism;

Fig. 2 is the flow chart of water production of part of the waste water backflow pure water machine;

Fig. 3 is a system schematic diagram of an embodiment of the present invention;

Fig. 4 is a schematic diagram of the system of the second embodiment of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

The filtration accuracy of reverse osmosis membrane (RO membrane) water purification technology is as high as 0.0001 micron, which can filter out almost all impurities and salts except water. However, the negative effect of the high-precision RO membrane is that it is extremely easy to be fouled. In order to prevent the RO membrane from being fouled and ensure the smoothness of the membrane during the water production process of the RO membrane, the RO membrane of the RO pure water machine must be produced while producing pure water. Ensure sufficient raw water to flush the surface of the RO membrane, so a large amount of waste water will be generated. The recommended value of the raw water utilization rate of the RO membrane produced by the famous American Dow Company is 15%. In China, pure water machine manufacturers use more Korean "Sehan membrane", Japan "Toray membrane" and domestic "Huitong membrane", etc., and the recommended raw water utilization rate is also about 25%.

Fig. 1 shows the water purification system in the prior art, comprising: water inlet tee 1, pre-filter group (by successively connected PPF cartridge filter 8, active carbon filter cartridge filter 10 and PPF cartridge filter connected by pipeline) device 11), booster pump 13, reverse osmosis membrane filter 15, high pressure switch 18, rear activated carbon filter 19, the outlet of the rear activated carbon filter is connected to the water outlet 20, such as a faucet connection, and the outlet of the high pressure switch 18 passes through the pipeline at the same time Connect with a water storage pressure barrel 4.

As shown in Figure 1, the water production process of an ordinary pure water machine is that the pressurized water is filtered by the reverse osmosis membrane, and then flows out from the central tube of the membrane through the pure water end of the reverse osmosis membrane filter, and the waste water end maintains uninterrupted discharge of waste water , the waste water is discharged by a waste water proportional valve 16 with a constant flow rate, and the waste water solenoid valve 17 is discharged after accumulating a period of waste water ratio discharge to ensure the removal of dirt deposits on the membrane. In this water production process, the utilization rate of raw water is about 25%.

As shown in Figure 2, the water process of the "less waste water" pure water mechanism of some domestic manufacturers adds a waste water backflow device to the process of ordinary pure water machines, and introduces part of the waste water into the inlet of the reverse osmosis membrane filter 15, removing the Constant flow of wastewater proportional valve 16, electromagnetic valve 17 is used for intermittent sewage discharge, so that the discharged wastewater can be recycled, reducing wastewater discharge, and the utilization rate of raw water is increased to 50% or even higher, but the reverse osmosis membrane is getting higher and higher In the environment of high-concentration wastewater, the output quality of pure water cannot be guaranteed, and at the same time, the damage to the reverse osmosis membrane is great, the fouling of the membrane is aggravated, and the service life is greatly shortened.

Fig. 3 is a water purification system shown in an embodiment of the present invention, comprising: a water inlet tee 1, a pre-filter group, a booster pump 13, a reverse osmosis membrane filter 15, and a rear activated carbon filter connected by pipelines in sequence 19. The outlet of the rear activated carbon filter is connected to the water outlet 20 through the high-pressure switch 18, and the outlet of the reverse osmosis membrane filter is connected to a water storage pressure tank 4 through a pipeline at the same time. Wherein, the outlet of the reverse osmosis membrane filter is provided with a waste water discharge pipeline, and the pipeline is provided with a pulse solenoid valve 14; the water storage pressure tank 4 passes through a pipeline and a check valve 22 to return trace pure water to the front end of the reverse osmosis membrane filter 15 It is used to soak the reverse osmosis membrane after the water production is completed.

As shown in Figure 3, the water production process proposed by the present invention removes the waste water proportional valve with a constant flow rate, and replaces the ordinary waste water solenoid valve with a pulse solenoid valve 14 with an opening and closing time within 0.1 second, and uses intermittent pulse blowdown, The rapid opening and closing of the solenoid valve generates a rapid flow of water to instantly flush the surface of the reverse osmosis membrane, quickly remove the accumulated dirt and sediment on the membrane, and achieve the purpose of effectively cleaning the reverse osmosis membrane with a very small amount of flushing water, greatly reducing the generation of wastewater. Compared with ordinary pure water machines, 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 (according to different water quality, waste water 1 : pure water 6 or more), the utilization rate of raw water has been greatly increased from less than 25% to more than 75%.

Among them, the specific flushing operation time is as follows: except for the opening and closing time of the solenoid valve, the time for each flushing is between 0.1 second and 1 second (0.3 second-0.5 second is better) to generate rapid and strong water flow, and the single flushing time If it is too short, the dirt deposits on the membrane cannot be completely removed, and if it is too long, it will not produce a strong water flow, wasting water and the flushing effect is not good. The interval between each flushing is between 15 seconds and 45 seconds. This interval time can be used as a tool to adjust the ratio of pure water to waste water. In areas with better water quality or when customers require ultra-low waste water discharge, the interval time can be extended to achieve the purpose of saving water. According to the test that the pure water produced by continuous operation reaches more than 10 tons, in the area where the raw water TDS value is less than 500, the effect of pure water 5: waste water 1 can be achieved, and the reverse osmosis membrane does not show a significant decrease in water flow. In areas where the TDS value of raw water is less than 300, the effect of pure water 6: waste water 1 can be achieved, or even higher. In this way, in the southern region of China where the water quality is better, the output of pure water can be increased more and the discharge of wastewater can be lowered, saving a lot of precious water resources in the case of large-scale use.

As shown in Figure 3, the present invention adds a pure water backflow device, and a water pipe is separated from the outlet of the external pressure tank 4 or the built-in filter type pressure tank of the direct drinking machine, and the pure water is returned to the reverse osmosis membrane filter through the one-way valve 22 15 front end, after the water production is completed, 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 returns after the water production is completed. The principle of adding this reflux device is: when the reverse osmosis membrane is rapidly and instantaneously pulsed sewage, the waste water ratio drops significantly, but the concentrated water accumulated at the blowdown end of the reverse osmosis membrane is more, and the TDS value rises greatly (especially in areas with high raw water TDS value Or it will be more obvious when the utilization of raw water is increased to more than 75%). After the water production is stopped for a period of time, the static osmosis principle of the reverse osmosis membrane will cause the TDS value of the water at the pure water end to be high, which is not conducive to the output of high-quality pure water. Through this pure water reflux device, the reverse osmosis membrane is rinsed and soaked in clean pure water after the water production is completed, and the TDS value of the waste water end is significantly reduced, which greatly reduces the possibility of seepage to the pure water end, and at the same time protects the reverse osmosis membrane. Compared with other "less waste water" water purifiers that return wastewater to the front of the reverse osmosis membrane to save water, the service life of the reverse osmosis membrane is not shortened but extended, and the output of high-quality pure water is more guaranteed.

Fig. 4 shows a second embodiment of the present invention. In this embodiment, a water flow sensor 7 can be added at the pure water outlet, and at the same time, a four-way valve 6 can be added at the front end of the reverse osmosis membrane filter 15, and a computer board can be used to control the water system. 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, municipal power supply and booster pumps can be used to realize micro-waste water under the condition of no electricity for pure water machines. The discharge produces pure water, which is more energy-saving and emission-reducing, which meets the requirements of my country's construction of a conservation-oriented society.

The above-mentioned embodiments are only used to illustrate specific implementation methods of the present invention. It should be noted that those skilled in the art can make several modifications and changes without departing from the concept of the present invention, and these modifications and changes should all belong to the protection scope of the present invention.

Claims (7)

1. A strong pulse micro-wastewater discharge water purification system, including: a water inlet tee (1), a pre-filter group, a booster pump (13), a reverse osmosis membrane filter (15) and Post activated carbon filter (19), the outlet of the post activated carbon filter is connected to the water outlet (20) through a high pressure switch (18), and the outlet of the reverse osmosis membrane filter is connected to a water storage pressure barrel (4 ) connection, which is characterized in that the outlet of the reverse osmosis membrane filter is provided with a waste water discharge pipe, and a pulse solenoid valve (14) is provided on the pipe; the water storage pressure barrel passes through a pipe and a one-way valve (22 ) Backflow trace pure water to the front end of the reverse osmosis membrane filter (15); The opening and closing time of the pulse solenoid valve (14) is 0.1 second; The pulse electromagnetic valve (14) flushes each time between 0.1 second and 1 second, and the interval between each flushing is between 15 seconds and 45 seconds; The ratio of waste water to pure water in the pulse blowdown is greater than 1:3. 2. The water purification system according to claim 1, characterized in that: a check valve (5) is provided at the front end of the high pressure switch (18). 3. The water purification system according to claim 1, characterized in that: the pre-filter group includes sequentially connected PPF element filter (8), activated carbon element filter (10) and PPF element filter ( 11). 4. The 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 post activated carbon filter (19). 5. The water purification system according to claim 1, characterized in that: a four-way valve (6) is provided between the booster pump (13) and the reverse osmosis membrane filter (15). 6. The water purification system according to claim 3, characterized in that: a water inlet solenoid valve (9) is provided between the PPF element filter (8) and the activated carbon element filter (10). 7. The water purification system according to claim 1, characterized in that: the booster pump (13) is connected to a transformer (12).