Unpowered ultrafiltration water purification device and water treatment method

Abstract

The invention provides an unpowered ultrafiltration water purification device and a water treatment method, and relates to the technical field of water treatment. According to the unpowered ultrafiltration water purification device provided by the invention, water can be produced under the condition that electricity is not needed; when no water production requirement exists, the ultrafiltration membrane assembly can be automatically subjected to enhanced backwashing and gas washing, so that the effective use of the membrane treatment performance is effectively ensured; when the ultrafiltration membrane assembly is blocked by certain dirt, backwashing and gas washing can be automatically performed on the ultrafiltration membrane assembly, so that continuous use of a filter membrane is realized; the siphon breaking pipe is communicated with the position, lower than the ultrafiltration membrane assembly, of the ultrafiltration device, so that sewage in the assembly is discharged to the lower end of the assembly during siphon breaking, and thorough discharge of pollutants is ensured; by further arranging a remote control floating ball valve, the machine can be automatically stopped under the condition of no water production requirement, and waste of raw water and consumption of membrane performance are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and particularly to a power-free ultrafiltration water purification device and a water treatment method. Background Art

[0002] Patent CN201910897879.7 provides an ultrafiltration membrane self-cleaning device that realizes automatic backwashing of the device by siphoning an internal sleeve, reducing the use of valves and pumps. However, this structure cannot perform forced backwashing manually and can only wait for siphon to be automatically formed in the siphon tube for backwashing. At the same time, due to the requirement of transmembrane pressure difference, the overall height of the device is relatively high, which is not conducive to transportation and on-site assembly.

[0003] Patent CN202022975644.6 increases the treatment capacity by changing the membrane module structure and realizes the full automation of the whole process of ultrafiltration and its backwashing. However, at present, the cleaning method of the membrane filaments mainly stays in the processes of backwashing and partial forward flushing, and the overall cleaning method is relatively weak. At the same time, the liquid inside the module is not fully replaced during the filtration process, resulting in excessive concentration of pollutants inside the module and causing irreversible pollution.

[0004] Patent CN202410136678.6 provides a relatively complete technical solution for power-free ultrafiltration operation process, which improves the full replacement of the concentrated water inside the system through a reasonable process flow, and at the same time uses the principle of siphon column to perform periodic automatic backwashing and sewage discharge. However, the filtration behavior of this system is only affected by the change of transmembrane pressure difference caused by membrane surface pollution on the inlet side, and cannot stop the filtration behavior in the state of full water in the clear water tank or other states without water production, resulting in excessive waste of membrane performance. At the same time, after reaching the cleaning threshold, the backwashing is carried out after the membrane surface pollution is formed, so that the pollutants are not easily peeled off.

[0005] Existing power-free ultrafiltration membrane treatment equipment on the market that uses the principle of siphon column, although through various methods such as equipment structure, process optimization, and membrane module selection, realizes the cyclic operation of filtration-backwashing of the equipment through hydraulic conditions and does not require human intervention during the operation process, mainly has the following disadvantages:

[0006] 1. The excitation conditions for automatic cleaning and sewage discharge of the equipment are the degree of membrane surface pollution. When the pollutants on the membrane surface accumulate to a certain extent and reach the critical value, the siphon backwashing-sewage discharge operation will be automatically carried out. There is no other excitation condition for automatic backwashing. This leads to a certain degree of pollution on the membrane surface when the equipment undergoes backwashing-sewage discharge. If the pollutants are difficult to remove, this occasional frequency of backwashing-sewage discharge cannot effectively peel off the pollutants, resulting in irreversible pollution on the membrane surface and reducing the membrane performance.

[0007] 2. Currently, the water usage time in rural areas is concentrated in the early, middle, and late periods, with less water usage at night. The existing energy-free ultrafiltration membrane water purification systems with automatic siphon cleaning functions on the market have the drawback of being unable to stop the filtration behavior. They are in the water production state during all periods except during membrane cleaning, which leads to the direct overflow and discharge of the ultrafiltration water production at night when there is no one using water, thus causing waste of membrane performance.

[0008] Therefore, it is necessary to find a water treatment device that can operate automatically in a periodic cycle without electricity, and can automatically stop the filtration behavior under the condition of no water production demand, so as to effectively ensure the effective use of the membrane treatment performance, and provide an effective enhanced backwashing solution for maintenance, enabling the system to perform cyclic enhanced backwashing before the pollutants on the membrane surface accumulate to the cleaning threshold, and realizing the effective regeneration of the membrane performance at the stage of weak membrane surface pollution.

[0009] In view of this, the present invention is specifically proposed. Summary of the Invention

[0010] The first object of the present invention is to provide a power-free ultrafiltration water purification device to solve the above technical problems.

[0011] The second object of the present invention is to provide a water treatment method.

[0012] To achieve the above objects, the following technical solutions are specifically adopted:

[0013] In the first aspect, the present invention provides a power-free ultrafiltration water purification device, including a raw water tank, a water inlet pipe, an ultrafiltration device, a backwashing water tank, a water production pipe, a clean water tank, a siphon pipe, and a water seal tank;

[0014] An ultrafiltration membrane module is arranged inside the ultrafiltration device, an inlet is arranged at the bottom, and a water production outlet is arranged at the top;

[0015] The raw water tank is connected to the inlet of the ultrafiltration device through the water inlet pipe; the backwashing water tank is connected to the water production outlet of the ultrafiltration device and is used to collect the purified water discharged from the water production outlet; the clean water tank is connected to the backwashing water tank through the water production pipe and is used to collect the purified water overflowing from the backwashing water tank;

[0016] An anti-washing air inlet pipe is arranged at the top of the backwashing water tank for connecting the backwashing water tank to the atmosphere;

[0017] A liquid level float ball valve is arranged in the clean water tank for adjusting the opening and closing of the water production pipe according to the liquid level of the clean water tank;

[0018] The siphon pipe includes a siphon rising section and a siphon falling section. One end of the siphon pipe is connected to the inlet of the ultrafiltration device, and the other end is immersed in the water seal tank;

[0019] An exhaust auxiliary pipe, a siphon auxiliary pipe and a siphon break pipe are provided on the siphon tube;

[0020] One end of the siphon auxiliary pipe is communicated with the upper part of the rising section of the siphon tube, and the other end is immersed in the water seal pool;

[0021] One end of the exhaust auxiliary pipe is communicated with the junction of the rising section and the falling section of the siphon tube, and the other end is arranged on the siphon auxiliary pipe and communicated with the siphon auxiliary pipe;

[0022] One end of the siphon break pipe is communicated with the junction of the rising section and the falling section of the siphon tube; the other end of the siphon break pipe is communicated with the inside of the ultrafiltration device, and the communication position is lower than the ultrafiltration membrane module.

[0023] As a further technical solution, the position of the raw water tank is higher than the junction of the rising section and the falling section of the siphon tube.

[0024] As a further technical solution, the connection point of the product water pipe and the backwash water tank is lower than the connection point of the rising section of the siphon tube and the siphon auxiliary pipe, and higher than the connection point of the product water outlet of the ultrafiltration device and the backwash water tank.

[0025] As a further technical solution, the highest point of the backwash inlet air pipe is higher than the junction of the rising section and the falling section of the siphon tube.

[0026] As a further technical solution, a remote control float valve is further included;

[0027] The remote control float valve includes a valve and a remote control float structure. The valve is arranged on the water inlet pipe, and the remote control float structure is arranged in the clear water tank for controlling the opening and closing of the water inlet pipe or reducing the water inlet flow according to the liquid level of the clear water tank.

[0028] As a further technical solution, the liquid level float valve and the remote control float valve are set to the same water level.

[0029] In a second aspect, the present invention provides a water treatment method, using the non-powered ultrafiltration water purification device to treat wastewater.

[0030] As a further technical solution, it includes the following steps:

[0031] a. Water production stage: The raw water to be treated enters the ultrafiltration device through the raw water tank, the water inlet pipe and the water inlet in sequence; after being treated by the ultrafiltration membrane module, it is discharged from the water outlet and collected in the backwash water tank; after the backwash water tank is full of water, the excess purified water overflows and flows to the clear water tank through the product water pipe;

[0032] b. Backwashing stage: When the ultrafiltration membrane module is fouled, the pressure required for water production increases, and the liquid level in the rising section of the siphon tube rises. When the liquid level rises to the position where the siphon auxiliary tube is connected to the rising section of the siphon tube, it falls in the siphon auxiliary tube, and a water-air entrainment effect is formed to evacuate the air at the top of the siphon tube through the exhaust auxiliary tube to form a negative pressure, causing the liquid level in the rising section of the siphon tube to continue to rise. When it rises to the top of the siphon tube, it quickly falls in the falling section of the siphon tube to form a siphon; after the siphon occurs, the purified water in the backwashing water tank flows back, and the ultrafiltration membrane module is sequentially subjected to backwashing with water and air washing. When the liquid in the ultrafiltration device drops to the position where the ultrafiltration device is connected to the siphon breakage tube, gas enters the siphon tube through the siphon breakage tube, the siphon is broken, and it enters the water production stage;

[0033] c. Enhanced backwashing stage: When the purified water in the clear water tank rises to the set height, the liquid level float ball valve closes the water production pipe; the liquid level in the rising section of the siphon tube rises. When the liquid level rises to the position where the siphon auxiliary tube is connected to the rising section of the siphon tube, it falls in the siphon auxiliary tube, and a water-air entrainment effect is formed to evacuate the air at the top of the siphon tube through the exhaust auxiliary tube to form a negative pressure, causing the liquid level in the rising section of the siphon tube to continue to rise. When it rises to the top of the siphon tube, it quickly falls in the falling section of the siphon tube to form a siphon; after the siphon occurs, the purified water in the backwashing water tank flows back, and the ultrafiltration membrane module is sequentially subjected to backwashing with water and air washing. When the liquid in the ultrafiltration device drops to the position where the ultrafiltration device is connected to the siphon breakage tube, gas enters the siphon tube through the siphon breakage tube, the siphon is broken, and it enters the water production stage.

[0034] As a further technical solution, the non-powered ultrafiltration water purification device is provided with a remote control float ball valve. When the purified water in the clear water tank rises to the set height, the liquid level float ball valve closes the water production pipe, and the remote control float ball valve closes the water inlet pipe, the water production stops or the remote control float ball valve reduces the water inlet flow rate, and it enters the enhanced backwashing stage.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The non-powered ultrafiltration water purification device provided by the present invention can produce water without electricity; when there is no water production requirement, it can automatically perform enhanced backwashing with water and air washing on the ultrafiltration membrane module, thereby effectively ensuring the effective use of the membrane treatment performance; when the ultrafiltration membrane module is slightly fouled, it can automatically perform backwashing with water and air washing on the ultrafiltration membrane module to realize the continuous use of the filter membrane; the siphon breakage tube is connected to the position on the ultrafiltration device below the ultrafiltration membrane module to ensure that the sewage in the module has been discharged to the lower end of the module when the siphon is broken, ensuring the complete discharge of pollutants; by further setting a remote control float ball valve, it can automatically stop when there is no water production requirement, avoiding waste of raw water and consumption of membrane performance. Description of the Drawings

[0037] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 This is the non-powered ultrafiltration water purification device provided in Embodiment 1 of the present invention;

[0039] Figure 2 This is the non-powered ultrafiltration water purification device provided in Embodiment 2 of the present invention.

[0040] Icon: 1 - Raw water tank; 2 - Inlet pipe; 3 - Water inlet; 4 - Rising section of the siphon; 5 - Ultrafiltration device; 6 - Water production port; 7 - Backwash water tank; 8 - Water production pipe; 9 - Liquid level float ball valve; 10 - Clear water tank; 11 - Exhaust auxiliary pipe; 12 - Siphon auxiliary pipe; 13 - Falling section of the siphon; 14 - Siphon break pipe; 15 - Water seal tank; 16 - Backwash air inlet pipe; 17 - Remote control float ball valve. Specific embodiments

[0041] The following will describe the implementation plans of the present invention in detail in combination with the embodiments and examples. However, those skilled in the art will understand that the following embodiments and examples are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Those not specifying specific conditions are carried out according to conventional conditions or conditions recommended by the manufacturer. Reagents or instruments not indicating the manufacturer are all conventional products that can be obtained through commercial purchase.

[0042] In the first aspect, the present invention provides a non-powered ultrafiltration water purification device, including a raw water tank 1, an inlet pipe 2, an ultrafiltration device 5, a backwash water tank 7, a water production pipe 8, a clear water tank 10, a siphon, and a water seal tank 15;

[0043] An ultrafiltration membrane module is provided inside the ultrafiltration device 5, a water inlet 3 is provided at the bottom, and a water production port 6 is provided at the top;

[0044] The raw water tank 1 is connected to the water inlet 3 of the ultrafiltration device 5 through the inlet pipe 2; the backwash water tank 7 is connected to the water production port 6 of the ultrafiltration device 5 and is used to collect the purified water discharged from the water production port 6; the clear water tank 10 is connected to the backwash water tank 7 through the water production pipe 8 and is used to collect the purified water overflowing from the backwash water tank 7;

[0045] An anti - washing air inlet pipe 16 is provided at the top of the anti - washing water tank 7 for connecting the anti - washing water tank 7 to the atmosphere;

[0046] A liquid - level float ball valve 9 is provided in the clean water tank 10 for adjusting the opening and closing of the water production pipe 8 according to the liquid level of the clean water tank 10;

[0047] The siphon tube includes a siphon rising section 4 and a siphon falling section 13. One end of the siphon tube is connected to the water inlet 3 of the ultra - filtration device 5, and the other end is immersed in the water seal tank 15;

[0048] An exhaust auxiliary pipe 11, a siphon auxiliary pipe 12 and a siphon break pipe 14 are provided on the siphon tube;

[0049] One end of the siphon auxiliary pipe 12 is connected to the upper part of the siphon rising section 4, and the other end is immersed in the water seal tank 15;

[0050] One end of the exhaust auxiliary pipe 11 is connected to the junction of the siphon rising section 4 and the siphon falling section 13, and the other end is arranged on the siphon auxiliary pipe 12 and is connected to the siphon auxiliary pipe 12;

[0051] One end of the siphon break pipe 14 is connected to the junction of the siphon rising section 4 and the siphon falling section 13; the other end of the siphon break pipe 14 is connected to the inside of the ultra - filtration device 5, and the connection position is lower than the ultra - filtration membrane module.

[0052] In the present invention, the water seal tank 15 is a pool filled with water.

[0053] The non - powered ultra - filtration water purification device provided by the present invention can produce water without electricity; when there is no water production requirement, it can automatically perform enhanced back - flushing and air flushing on the ultra - filtration membrane module, thereby effectively ensuring the effective use of the membrane treatment performance; when the ultra - filtration membrane module has a certain degree of fouling, it can automatically perform back - flushing and air flushing on the ultra - filtration membrane module to realize the continuous use of the filter membrane; the siphon break pipe is connected to a position on the ultra - filtration device lower than the ultra - filtration membrane module to ensure that the sewage in the module has been discharged to the lower end of the module during siphon break, ensuring the complete discharge of pollutants; by further setting a remote - control float ball valve, it can automatically stop under the condition of no water production requirement, avoiding wasting raw water and consuming membrane performance.

[0054] In some alternative embodiments, the position of the raw water tank 1 is higher than the junction of the siphon rising section 4 and the siphon falling section 13.

[0055] In some alternative embodiments, the position of the raw water tank 1 is 1 meter higher than the junction of the siphon rising section 4 and the siphon falling section 13.

[0056] In some alternative embodiments, the connection point between the product water pipe 8 and the backwash water tank 7 is lower than the connection point between the rising section 4 of the siphon pipe and the siphon assist pipe 12, and higher than the connection point between the product water outlet 6 of the ultrafiltration device 5 and the backwash water tank 7.

[0057] In some alternative embodiments, the connection point between the product water pipe 8 and the backwash water tank 7 is 1.5 meters lower than the connection point between the rising section 4 of the siphon pipe and the siphon assist pipe 12.

[0058] In some alternative embodiments, the highest point of the backwash inlet pipe 16 is higher than the junction of the rising section 4 of the siphon pipe and the falling section 13 of the siphon pipe.

[0059] In some alternative embodiments, the highest point of the backwash inlet pipe 16 is 0.5 meters higher than the junction of the rising section 4 of the siphon pipe and the falling section 13 of the siphon pipe.

[0060] In some alternative embodiments, a remote control float valve 17 is further included;

[0061] The remote control float valve 17 includes a valve and a remote control float structure. The valve is arranged on the water inlet pipe 2, and the remote control float structure is arranged in the clear water tank 10 for controlling the opening and closing of the water inlet pipe 2 or reducing the water inlet flow according to the liquid level of the clear water tank 10.

[0062] In some alternative embodiments, the liquid level float valve 9 and the remote control float valve 17 are set to the same water level to achieve synchronous control of the two when the clear water tank 10 reaches the set water level.

[0063] In a second aspect, the present invention provides a water treatment method for treating wastewater by using the non-powered ultrafiltration water purification device described above.

[0064] This method is simple and convenient with low cost.

[0065] In some alternative embodiments, the method includes the following steps:

[0066] a. Product water stage: The raw water to be treated sequentially enters the ultrafiltration device 5 through the raw water tank 1, the water inlet pipe 2, and the water inlet 3; after being treated by the ultrafiltration membrane module, it is discharged from the product water outlet 6 and collected in the backwash water tank 7; after the backwash water tank 7 is filled with water, the excess purified water overflows and flows through the product water pipe 8 to the clear water tank 10;

[0067] b. Backwashing stage: When the ultrafiltration membrane module is fouled, the pressure required for water production increases, the liquid level in the rising section 4 of the siphon tube rises. When the liquid level rises to the position where the siphon auxiliary tube 12 is connected to the rising section 4 of the siphon tube, it falls in the siphon auxiliary tube 12, and a water-entrained air effect is formed to evacuate the air at the top of the siphon tube through the exhaust auxiliary tube 11 to form a negative pressure, causing the liquid level in the rising section 4 of the siphon tube to continue to rise. When it rises to the top of the siphon tube (the junction of the rising section 4 and the falling section 13 of the siphon tube), it quickly falls in the falling section 13 of the siphon tube to form a siphon; after the siphon occurs, the purified water in the backwashing water tank 7 flows back, and the ultrafiltration membrane module is successively subjected to backwashing with water and air washing. When the liquid in the ultrafiltration device 5 drops to the position where the ultrafiltration device 5 is connected to the siphon breaking tube 14, gas enters the siphon tube through the siphon breaking tube 14, the siphon is broken, and it enters the water production stage;

[0068] c. Enhanced backwashing stage: When the purified water in the clear water tank 10 rises to the set height, the liquid level float valve 9 closes the water production pipe 8; the liquid level in the rising section 4 of the siphon tube rises. When the liquid level rises to the position where the siphon auxiliary tube 12 is connected to the rising section 4 of the siphon tube, it falls in the siphon auxiliary tube 12, and a water-entrained air effect is formed to evacuate the air at the top of the siphon tube through the exhaust auxiliary tube 11 to form a negative pressure, causing the liquid level in the rising section 4 of the siphon tube to continue to rise. When it rises to the top of the siphon tube (the junction of the rising section 4 and the falling section 13 of the siphon tube), it quickly falls in the falling section 13 of the siphon tube to form a siphon; after the siphon occurs, the purified water in the backwashing water tank 7 flows back, and the ultrafiltration membrane module is successively subjected to backwashing with water and air washing. When the liquid in the ultrafiltration device 5 drops to the position where the ultrafiltration device 5 is connected to the siphon breaking tube 14, gas enters the siphon tube through the siphon breaking tube 14, the siphon is broken, and it enters the water production stage.

[0069] In some alternative embodiments, the non-powered ultrafiltration water purification device is provided with the remote control float valve 17. When the purified water in the clear water tank 10 rises to the set height, the liquid level float valve 9 closes the water production pipe 8, and the remote control float valve 17 closes the water inlet pipe 2, the water production stops or the remote control float valve 17 reduces the water inlet flow rate, and it enters the enhanced backwashing stage.

[0070] The present invention will be further described below through specific embodiments. However, it should be understood that these embodiments are only used for more detailed description and should not be construed as limiting the present invention in any form.

[0071] Embodiment 1

[0072] A non-powered ultrafiltration water purification device, as Figure 1 shown, includes a raw water tank 1, a water inlet pipe 2, an ultrafiltration device 5, a backwashing water tank 7, a water production pipe 8, a clear water tank 10, a siphon tube, a water seal tank 15, and a remote control float valve 17;

[0073] Inside the ultrafiltration device 5, there is an ultrafiltration membrane module. At the bottom, there is a water inlet 3, and at the top, there is a water production outlet 6;

[0074] The raw water tank 1 is connected to the water inlet 3 of the ultrafiltration device 5 through a water inlet pipe 2; the backwash water tank 7 is connected to the water production outlet 6 of the ultrafiltration device 5 and is used to collect the purified water discharged from the water production outlet 6; the clean water tank 10 is connected to the backwash water tank 7 through a water production pipe 8 and is used to collect the purified water overflowing from the backwash water tank 7;

[0075] At the top of the backwash water tank 7, there is a backwash air inlet pipe 16, which is used to connect the backwash water tank 7 to the atmosphere;

[0076] The clean water tank 10 is provided with a liquid level float ball valve 9, which is used to adjust the opening and closing of the water production pipe 8 according to the liquid level of the clean water tank 10;

[0077] The siphon pipe includes a siphon rising section 4 and a siphon falling section 13. One end of the siphon pipe is connected to the water inlet 3 of the ultrafiltration device 5, and the other end is immersed in the water seal pool 15;

[0078] On the siphon pipe, there are an exhaust auxiliary pipe 11, a siphon auxiliary pipe 12, and a siphon breaking pipe 14;

[0079] One end of the siphon auxiliary pipe 12 is connected to the upper part of the siphon rising section 4, and the other end is immersed in the water seal pool 15;

[0080] One end of the exhaust auxiliary pipe 11 is connected to the junction of the siphon rising section 4 and the siphon falling section 13, and the other end is arranged on the siphon auxiliary pipe 12 and is connected to the siphon auxiliary pipe 12;

[0081] One end of the siphon breaking pipe 14 is connected to the junction of the siphon rising section 4 and the siphon falling section 13; the other end of the siphon breaking pipe 14 is connected to the inside of the ultrafiltration device 5, and the connection position is lower than the ultrafiltration membrane module;

[0082] The remote control float ball valve 17 includes a valve and a remote control float ball structure. The valve is arranged on the water inlet pipe 2, and the remote control float ball structure is arranged in the clean water tank 10 and is used to control the opening and closing of the water inlet pipe 2 or reduce the water inlet flow according to the liquid level of the clean water tank 10. In this solution, the liquid level float ball valve 9 and the remote control float ball valve 17 are set to the same water level.

[0083] Among them, the position of the raw water tank 1 is higher than the junction of the siphon rising section 4 and the siphon falling section 13; the connection position of the water production pipe 8 and the backwash water tank 7 is lower than the connection position of the siphon rising section 4 and the siphon auxiliary pipe 12 and higher than the connection position of the water production outlet 6 of the ultrafiltration device 5 and the backwash water tank 7; the highest point of the backwash air inlet pipe 16 is higher than the junction of the siphon rising section 4 and the siphon falling section 13.

[0084] The working process of this device is as follows:

[0085] a. Water production stage: The raw water to be treated sequentially passes through the raw water tank 1, the water inlet pipe 2, and the water inlet 3 and enters the ultrafiltration device 5; after being treated by the ultrafiltration membrane module, it is discharged from the water production outlet 6 and collected in the backwash water tank 7; after the backwash water tank 7 is filled with water, the excess purified water overflows and flows through the water production pipe 8 to the clear water tank 10;

[0086] b. Backwash stage: When the ultrafiltration membrane module is fouled, the pressure required for water production increases, and the liquid level in the rising section 4 of the siphon pipe rises. When the liquid level rises to the position where the siphon auxiliary pipe 12 is connected to the rising section 4 of the siphon pipe, it falls in the siphon auxiliary pipe 12 and forms a water-air sandwich effect to draw the air at the top of the siphon pipe through the exhaust auxiliary pipe 11 to form a negative pressure, causing the liquid level in the rising section 4 of the siphon pipe to continue to rise. When it rises to the top of the siphon pipe (the junction of the rising section 4 and the falling section 13 of the siphon pipe), it quickly falls in the falling section 13 of the siphon pipe to form a siphon; after the siphon occurs, the purified water in the backwash water tank 7 flows back and sequentially performs backwashing and air washing on the ultrafiltration membrane module. When the liquid in the ultrafiltration device 5 drops to the position where the ultrafiltration device 5 is connected to the siphon breaking pipe 14, gas enters the siphon pipe through the siphon breaking pipe 14, the siphon is broken, and it enters the water production stage;

[0087] c. Enhanced backwash stage: When the purified water in the clear water tank 10 rises to the set height, the liquid level float ball valve 9 closes the water production pipe 8, and the remote control float ball valve 17 reduces the water inlet flow rate; the liquid level in the rising section 4 of the siphon pipe rises. When the liquid level rises to the position where the siphon auxiliary pipe 12 is connected to the rising section 4 of the siphon pipe, it falls in the siphon auxiliary pipe 12 and forms a water-air sandwich effect to draw the air at the top of the siphon pipe through the exhaust auxiliary pipe 11 to form a negative pressure, causing the liquid level in the rising section 4 of the siphon pipe to continue to rise. When it rises to the top of the siphon pipe (the junction of the rising section 4 and the falling section 13 of the siphon pipe), it quickly falls in the falling section 13 of the siphon pipe to form a siphon; after the siphon occurs, the purified water in the backwash water tank 7 flows back and sequentially performs backwashing and air washing on the ultrafiltration membrane module. When the liquid in the ultrafiltration device 5 drops to the position where the ultrafiltration device 5 is connected to the siphon breaking pipe 14, gas enters the siphon pipe through the siphon breaking pipe 14, the siphon is broken, and it enters the water production stage;

[0088] Alternatively, when the purified water in the clear water tank 10 rises to the set height, the liquid level float ball valve 9 closes the water production pipe 8, and the remote control float ball valve 17 closes the water inlet pipe 2, and the water production stops.

[0089] Embodiment 2

[0090] A power-free ultrafiltration water purification device, as Figure 2 shown, includes a raw water tank 1, a water inlet pipe 2, an ultrafiltration device 5, a backwash water tank 7, a water production pipe 8, a clear water tank 10, a siphon pipe, and a water seal tank 15;

[0091] The interior of the ultrafiltration device 5 is provided with an ultrafiltration membrane module, the bottom is provided with a water inlet 3, and the top is provided with a water production outlet 6;

[0092] The raw water tank 1 is connected to the water inlet 3 of the ultrafiltration device 5 through a water inlet pipe 2; the backwash water tank 7 is connected to the water production outlet 6 of the ultrafiltration device 5 and is used to collect the purified water discharged from the water production outlet 6; the clean water tank 10 is connected to the backwash water tank 7 through a water production pipe 8 and is used to collect the purified water overflowing from the backwash water tank 7;

[0093] The top of the backwash water tank 7 is provided with a backwash air inlet pipe 16 for connecting the backwash water tank 7 to the atmosphere;

[0094] The clean water tank 10 is provided with a liquid level float ball valve 9 for adjusting the opening and closing of the water production pipe 8 according to the liquid level of the clean water tank 10;

[0095] The siphon tube includes a siphon tube rising section 4 and a siphon tube falling section 13. One end of the siphon tube is connected to the water inlet 3 of the ultrafiltration device 5, and the other end is immersed in the water seal pool 15;

[0096] The siphon tube is provided with an exhaust auxiliary pipe 11, a siphon auxiliary pipe 12 and a siphon breaking pipe 14;

[0097] One end of the siphon auxiliary pipe 12 is connected to the upper part of the siphon tube rising section 4, and the other end is immersed in the water seal pool 15;

[0098] One end of the exhaust auxiliary pipe 11 is connected to the junction of the siphon tube rising section 4 and the siphon tube falling section 13, and the other end is arranged on the siphon auxiliary pipe 12 and is connected to the siphon auxiliary pipe 12;

[0099] One end of the siphon breaking pipe 14 is connected to the junction of the siphon tube rising section 4 and the siphon tube falling section 13; the other end of the siphon breaking pipe 14 is connected to the interior of the ultrafiltration device 5, and the connection position is lower than the ultrafiltration membrane module;

[0100] Among them, the position of the raw water tank 1 is higher than the junction of the siphon tube rising section 4 and the siphon tube falling section 13; the connection position of the water production pipe 8 and the backwash water tank 7 is lower than the connection position of the siphon tube rising section 4 and the siphon auxiliary pipe 12 and higher than the connection position of the water production outlet 6 of the ultrafiltration device 5 and the backwash water tank 7; the highest point of the backwash air inlet pipe 16 is higher than the junction of the siphon tube rising section 4 and the siphon tube falling section 13.

[0101] The working process of this device is as follows:

[0102] a. Water production stage: The raw water to be treated sequentially enters the ultrafiltration device 5 through the raw water tank 1, the water inlet pipe 2 and the water inlet 3; after being treated by the ultrafiltration membrane module, it is discharged from the water production outlet 6 and collected in the backwash water tank 7; after the backwash water tank 7 is full of water, the excess purified water overflows and flows through the water production pipe 8 to the clean water tank 10;

[0103] b. Backwashing stage: When the ultrafiltration membrane module is fouled, the pressure required for water production increases, and the liquid level in the rising section 4 of the siphon tube rises. When the liquid level rises to the position where the siphon auxiliary tube 12 is connected to the rising section 4 of the siphon tube, it falls in the siphon auxiliary tube 12, and a water-air entrainment effect is formed to evacuate the air at the top of the siphon tube through the exhaust auxiliary tube 11 to form a negative pressure, causing the liquid level in the rising section 4 of the siphon tube to continue to rise. When it rises to the top of the siphon tube (the junction of the rising section 4 and the falling section 13 of the siphon tube), it quickly falls in the falling section 13 of the siphon tube to form a siphon; after the siphon occurs, the purified water in the backwashing water tank 7 flows back, and the ultrafiltration membrane module is sequentially subjected to backwashing with water and air washing. When the liquid in the ultrafiltration device 5 drops to the position where the ultrafiltration device 5 is connected to the siphon breaking tube 14, gas enters the siphon tube through the siphon breaking tube 14, the siphon is broken, and the water production stage is entered;

[0104] c. Enhanced backwashing stage: When the purified water in the clear water tank 10 rises to the set height, the liquid level float valve 9 closes the water production pipe 8; the liquid level in the rising section 4 of the siphon tube rises. When the liquid level rises to the position where the siphon auxiliary tube 12 is connected to the rising section 4 of the siphon tube, it falls in the siphon auxiliary tube 12, and a water-air entrainment effect is formed to evacuate the air at the top of the siphon tube through the exhaust auxiliary tube 11 to form a negative pressure, causing the liquid level in the rising section 4 of the siphon tube to continue to rise. When it rises to the top of the siphon tube (the junction of the rising section 4 and the falling section 13 of the siphon tube), it quickly falls in the falling section 13 of the siphon tube to form a siphon; after the siphon occurs, the purified water in the backwashing water tank 7 flows back, and the ultrafiltration membrane module is sequentially subjected to backwashing with water and air washing. When the liquid in the ultrafiltration device 5 drops to the position where the ultrafiltration device 5 is connected to the siphon breaking tube 14, gas enters the siphon tube through the siphon breaking tube 14, the siphon is broken, and the water production stage is entered.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-powered ultrafiltration water purification device, characterized in that, It includes an original water tank (1), a water inlet pipe (2), an ultrafiltration device (5), a backwash water tank (7), a product water pipe (8), a clean water tank (10), a siphon pipe, and a water seal tank (15); An ultrafiltration membrane module is arranged inside the ultrafiltration device (5), a water inlet (3) is arranged at the bottom, and a product water outlet (6) is arranged at the top; The original water tank (1) is communicated with the water inlet (3) of the ultrafiltration device (5) through the water inlet pipe (2); the backwash water tank (7) is communicated with the product water outlet (6) of the ultrafiltration device (5) and is used for collecting the purified water discharged from the product water outlet (6); the clean water tank (10) is communicated with the backwash water tank (7) through the product water pipe (8) and is used for collecting the purified water overflowing from the backwash water tank (7); An anti-wash air inlet pipe (16) is arranged at the top of the backwash water tank (7) and is used for communicating the backwash water tank (7) with the atmosphere; A liquid level float ball valve (9) is arranged on the clean water tank (10) and is used for adjusting the opening and closing of the product water pipe (8) according to the liquid level of the clean water tank (10); The siphon pipe includes a siphon pipe rising section (4) and a siphon pipe falling section (13). One end of the siphon pipe is communicated with the water inlet (3) of the ultrafiltration device (5), and the other end is immersed in the water seal tank (15); An exhaust auxiliary pipe (11), a siphon auxiliary pipe (12), and a siphon breaking pipe (14) are arranged on the siphon pipe; One end of the siphon auxiliary pipe (12) is communicated with the upper part of the siphon pipe rising section (4), and the other end is immersed in the water seal tank (15); One end of the exhaust auxiliary pipe (11) is communicated with the junction of the siphon pipe rising section (4) and the siphon pipe falling section (13), and the other end is arranged on the siphon auxiliary pipe (12) and is communicated with the siphon auxiliary pipe (12); One end of the siphon breaking pipe (14) is communicated with the junction of the siphon pipe rising section (4) and the siphon pipe falling section (13); the other end of the siphon breaking pipe (14) is communicated with the inside of the ultrafiltration device (5), and the communication position is lower than the ultrafiltration membrane module.

2. The non-powered ultrafiltration water purification device according to claim 1, wherein The position of the original water tank (1) is higher than the junction of the siphon pipe rising section (4) and the siphon pipe falling section (13).

3. The non-powered ultrafiltration water purification device according to claim 1, wherein, The connection position of the product water pipe (8) and the backwash water tank (7) is lower than the connection position of the siphon pipe rising section (4) and the siphon auxiliary pipe (12), and higher than the connection position of the product water outlet (6) of the ultrafiltration device (5) and the backwash water tank (7).

4. The non-powered ultrafiltration water purification device according to claim 1, characterized in that, The highest point of the anti-wash air inlet pipe (16) is higher than the junction of the siphon pipe rising section (4) and the siphon pipe falling section (13).

5. The non-powered ultrafiltration water purification device according to claim 1, characterized in that, It further includes a remote control float ball valve (17); The remote control float ball valve (17) includes a valve and a remote control float ball structure. The valve is arranged on the water inlet pipe (2), and the remote control float ball structure is arranged in the clean water tank (10) and is used for controlling the opening and closing of the water inlet pipe (2) or reducing the water inlet flow according to the liquid level of the clean water tank (10).

6. The non-powered ultrafiltration water purification device according to claim 5, characterized in that, The liquid level float ball valve (9) and the remote control float ball valve (17) are set at the same water level.

7. A water treatment method, characterized in that, Using the non-powered ultrafiltration water purification device according to any one of claims 1-6 to treat wastewater.

8. The water treatment method according to claim 7, characterized in that, It includes the following steps: a. Water production stage: The raw water to be treated sequentially enters the ultrafiltration device (5) through the raw water tank (1), the inlet pipe (2), and the water inlet (3); after being treated by the ultrafiltration membrane module, it is discharged from the water production outlet (6) and collected in the backwash water tank (7); after the backwash water tank (7) is filled with water, the excess purified water overflows and flows through the water production pipe (8) into the clear water tank (10). b. Backwash stage: When the ultrafiltration membrane module is fouled, the pressure required for water production increases, and the liquid level in the rising section (4) of the siphon tube rises. When the liquid level rises to the position where the siphon auxiliary tube (12) is connected to the rising section (4) of the siphon tube, it falls in the siphon auxiliary tube (12), and a water-air entrainment effect is formed to evacuate the air at the top of the siphon tube through the exhaust auxiliary tube (11) to form a negative pressure, causing the liquid level in the rising section (4) of the siphon tube to continue to rise. When it rises to the top of the siphon tube, it quickly falls in the falling section (13) of the siphon tube to form a siphon; after the siphon occurs, the purified water in the backwash water tank (7) flows back to wash the ultrafiltration membrane module with water and gas in sequence. After the liquid in the ultrafiltration device (5) drops to the position where the ultrafiltration device (5) is connected to the siphon break tube (14), gas enters the siphon tube through the siphon break tube (14), the siphon is broken, and it enters the water production stage. c. Enhanced backwash stage: When the purified water in the clear water tank (10) rises to the set height, the liquid level float valve (9) closes the water production pipe (8); the liquid level in the rising section (4) of the siphon tube rises. When the liquid level rises to the position where the siphon auxiliary tube (12) is connected to the rising section (4) of the siphon tube, it falls in the siphon auxiliary tube (12), and a water-air entrainment effect is formed to evacuate the air at the top of the siphon tube through the exhaust auxiliary tube (11) to form a negative pressure, causing the liquid level in the rising section (4) of the siphon tube to continue to rise. When it rises to the top of the siphon tube, it quickly falls in the falling section (13) of the siphon tube to form a siphon; after the siphon occurs, the purified water in the backwash water tank (7) flows back to wash the ultrafiltration membrane module with water and gas in sequence. After the liquid in the ultrafiltration device (5) drops to the position where the ultrafiltration device (5) is connected to the siphon break tube (14), gas enters the siphon tube through the siphon break tube (14), the siphon is broken, and it enters the water production stage.

9. The water treatment method according to claim 8, wherein The non-powered ultrafiltration water purification device is provided with a remote control float valve (17). When the purified water in the clear water tank (10) rises to the set height, the liquid level float valve (9) closes the water production pipe (8), and the remote control float valve (17) closes the inlet pipe (2), the water production stops or the remote control float valve (17) reduces the water inlet flow rate, and it enters the enhanced backwash stage.

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