Integrated water treatment system and application method

Abstract

The invention relates to the technical field of water treatment, in particular to an integrated water treatment system and an application method. The system comprises an electric flocculation unit, an ultrafiltration unit and a reverse osmosis unit which are sequentially arranged along the water purification direction, the electric flocculation unit comprises an electrode and a reaction tank; the ultrafiltration unit comprises an ultrafiltration water tank, an ultrafiltration water outlet tank, a backwashing assembly and an ultrafiltration assembly; the ultrafiltration assembly comprises a plurality of ultrafiltration membrane single pieces which are arranged in parallel; the backwashing assembly is communicated with the ultrafiltration water outlet tank through the ultrafiltration assembly; the reverse osmosis unit comprises a cleaning assembly as well as a water inlet pump, a third security filter, a high-pressure pump and a reverse osmosis assembly which are sequentially arranged along the water purification direction; the reverse osmosis assembly comprises a plurality of reverse osmosis membrane single pieces which are arranged in parallel; and the cleaning assembly, the high-pressure pump and the reverse osmosis assembly form a cleaning loop. The application method adopts the system to complete water purification. The method can solve the problems existing in a single water treatment method.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to an integrated water treatment system and an application method. Background Art

[0002] At present, commonly used water treatment methods include chemical flocculation, filtration and membrane treatment. When treating water, the traditional chemical flocculation method needs to add a large amount of chemical flocculants, which not only increases the treatment cost, but also may cause secondary pollution. In addition, chemical flocculants are not effective in removing some soluble pollutants and small molecular impurities. Filtration methods (such as sand filtration) have limited interception capacity for tiny particles, colloids and microorganisms, and it is difficult to meet high standards of water quality. The membrane treatment method includes ultrafiltration (UF) and reverse osmosis (RO). The ultrafiltration (UF) method uses ultrafiltration membrane to purify water quality. Although it can effectively remove colloids, macromolecular organic matter and bacteria, it has poor removal effect on soluble salts and heavy metal ions. The reverse osmosis (RO) method uses reverse osmosis membrane to purify water quality. Although it can deeply remove soluble salts and almost all impurities in water, it has high requirements for influent water quality; if the influent water quality is poor, it is easy to cause reverse osmosis membrane pollution, shorten the service life of the reverse osmosis membrane, and increase operating costs.

[0003] In summary, it is necessary to develop an integrated water treatment system and application method to solve the problems existing in the prior art using a single water treatment method. Summary of the invention

[0004] The purpose of the present invention is to provide an integrated water treatment system and application method. The specific technical scheme is as follows:

[0005] In a first aspect, the present invention provides an integrated water treatment system, comprising an electro-flocculation unit, an ultrafiltration unit and a reverse osmosis unit arranged in sequence along a water purification direction;

[0006] The electro-flocculation unit comprises an electrode and a reaction tank; a reaction zone, a flocculation zone, a sedimentation zone and an electro-flocculation water production zone are sequentially arranged in the reaction tank along the direction of water purification; the electrode is plate-shaped or mesh-shaped, and is arranged in the reaction zone and connected to a power source;

[0007] The ultrafiltration unit comprises an ultrafiltration water tank, an ultrafiltration water outlet tank, a backwash component and an ultrafiltration component; the ultrafiltration component comprises a plurality of ultrafiltration membrane units arranged in parallel, and the water inlet of each ultrafiltration membrane unit is connected to the electro-flocculation water production area, the ultrafiltration purified water outlet of each ultrafiltration membrane unit is connected to the ultrafiltration water tank, and the ultrafiltration concentrated liquid outlet of each ultrafiltration membrane unit is connected to the ultrafiltration water outlet tank; the backwash component is connected to the ultrafiltration water outlet tank via the ultrafiltration component;

[0008] The reverse osmosis unit includes a cleaning component and a water inlet pump, a third safety filter, a high-pressure pump and a reverse osmosis component arranged in sequence along the water purification direction; the reverse osmosis component includes a plurality of reverse osmosis membrane units arranged in parallel, and the water inlet end of each reverse osmosis membrane unit is connected to the ultrafiltration water tank, the reverse osmosis purified water outlet end of each reverse osmosis membrane unit is connected to the production water tank, and the reverse osmosis concentrated liquid outlet end of each reverse osmosis membrane unit is connected to the reverse osmosis water outlet tank; the cleaning component forms a cleaning loop with the high-pressure pump and the reverse osmosis component.

[0009] Optionally, a first safety filter is further arranged between the electro-flocculation unit and the ultrafiltration unit; the first safety filter comprises PP cotton.

[0010] Optionally, a stirring device is provided in the flocculation zone;

[0011] An inclined plate for sludge sedimentation is arranged in the sedimentation area; a water filter tank connected to the electric flocculation water production area is arranged above the inclined plate; and a sludge hopper is arranged below the inclined plate;

[0012] The electrodes include an anode and a cathode, both of which are plate-shaped structures with a length of 850 to 950 mm, a width of 350 to 450 mm, and a thickness of 5 to 15 mm.

[0013] Optionally, a pH adjusting device is provided on the outlet end of the ultrafiltration purified water of each ultrafiltration membrane unit; and an acid-base pH adjusting agent is filled in the pH adjusting device.

[0014] Optionally, a booster pump, a flow regulating valve and a pressure sensor are further provided on the pipeline communicating between the electro-flocculation unit and the ultrafiltration unit;

[0015] The water inlet of each ultrafiltration membrane unit is connected to the electro-flocculation water production area through a flow regulating valve, the ultrafiltration purified water outlet of each ultrafiltration membrane unit is connected to the ultrafiltration water tank through a flow regulating valve, and the ultrafiltration concentrated liquid outlet of each ultrafiltration membrane unit is connected to the ultrafiltration water outlet tank through a flow regulating valve;

[0016] The backwash component includes a backwash water tank, a backwash pump and a flow regulating valve; the water inlet end of the backwash pump is connected to the backwash water tank, and the flow regulating valve is arranged on the pipeline connecting the two; the water outlet end of the backwash pump is connected to the ultrafiltration water outlet tank through the ultrafiltration component, and the flow regulating valve is arranged on the pipeline connecting the water outlet end of the backwash pump and the ultrafiltration component and on the pipeline connecting the ultrafiltration component and the ultrafiltration water outlet tank.

[0017] Optionally, the water inlet of each reverse osmosis membrane unit is connected to the ultrafiltration water tank through a flow regulating valve, the reverse osmosis purified water outlet of each reverse osmosis membrane unit is connected to the water production tank through a flow regulating valve, and the reverse osmosis concentrated liquid outlet of each reverse osmosis membrane unit is connected to the reverse osmosis water outlet tank through a flow regulating valve;

[0018] The cleaning component includes a cleaning water tank, a cleaning pump, a second safety filter and a flow regulating valve; the water inlet of the cleaning pump is connected to the cleaning water tank, and the water outlet is connected to the water inlet of the second safety filter through the flow regulating valve; the water outlet of the second safety filter is connected to the water inlet of the high-pressure pump through the flow regulating valve; the water outlet of the high-pressure pump is connected to the water inlet of the reverse osmosis component; the water outlet of the reverse osmosis component is connected to the cleaning water tank through the flow regulating valve; the second safety filter includes PP cotton.

[0019] Optionally, the reverse osmosis unit also includes an energy recovery pipeline; the water inlet end of the energy recovery pipeline is connected to the reverse osmosis concentrate water outlet end of each reverse osmosis membrane unit, and its water outlet end is connected to the water inlet end of the high-pressure pump; a flow regulating valve is arranged on the energy recovery pipeline.

[0020] Optionally, the integrated water treatment system also includes a PLC controller; the PLC controller is respectively connected to the power supply, the water inlet pump, the high-pressure pump, the pH adjustment device, each of the flow regulating valves, the pressure sensor, the booster pump, the backwash pump and the cleaning pump.

[0021] In a second aspect, the present invention provides an application method of the integrated water treatment system, comprising:

[0022] Step S1, when the wastewater flows into the reaction zone in the reaction tank, the PLC controller turns on the power supply to complete the electrolysis of the wastewater; wherein the PLC controller sets the current size to 20-600A and the electrolysis time to 5-30min; the electrolyzed wastewater flows into the electric flocculation water production zone through the flocculation zone and the sedimentation zone in turn to obtain primary purified water;

[0023] Step S2, the PLC controller opens the boost pump and the flow regulating valves on the ultrafiltration component, and obtains ultrafiltration purified water and ultrafiltration concentrated liquid after the primary purified water is ultrafiltered and purified by the ultrafiltration component. The ultrafiltration purified water flows into the ultrafiltration water tank, and the ultrafiltration concentrated liquid flows into the ultrafiltration water outlet tank; during ultrafiltration purification, the PLC controller adjusts the operating pressure of the boost pump to 0.1-0.6MPa, and monitors the operating pressure of the boost pump in real time through the pressure sensor; the PLC controller controls the water inlet flux during ultrafiltration purification to be 50-200L / m 2; The molecular weight cutoff of each ultrafiltration membrane used in the ultrafiltration membrane is 1000 to 100000 Daltons; the PLC controller controls the pH adjustment device to adjust the pH value of the ultrafiltration purified water to 6.5 to 7.5;

[0024] Step S3, the PLC controller opens the water inlet pump, the high-pressure pump and each flow regulating valve in the reverse osmosis component, and the ultrafiltration purified water flows from the ultrafiltration water tank into the reverse osmosis component to obtain reverse osmosis purified water and reverse osmosis concentrated liquid after reverse osmosis purification, the reverse osmosis purified water flows into the water production tank, and the reverse osmosis concentrated liquid flows into the reverse osmosis water outlet tank; wherein, the PLC controller opens the flow regulating valve on the energy recovery pipeline to recover the initial reverse osmosis concentrated liquid, and completes the secondary purification through the high-pressure pump and the reverse osmosis component to increase the water production rate; the PLC controller controls the operating pressure of the high-pressure pump to be 1 to 10 MPa.

[0025] Optionally, the application method further comprises backwashing and / or forward washing of the ultrafiltration component;

[0026] During backwashing, the PLC controller turns on the backwash pump and each flow regulating valve in the backwash component, introduces the water in the backwash water tank into the ultrafiltration component, realizes the backwashing of the ultrafiltration component, and then discharges it through the ultrafiltration water tank; the backwashing operation time is 30 to 60 seconds; the backwashing interval period is 30 to 120 minutes;

[0027] During the normal washing, the operation process in step S2 is followed;

[0028] The application method also includes cleaning the reverse osmosis component; the PLC controller turns on the cleaning pump, the flow regulating valves in the cleaning component, the high-pressure pump and the flow regulating valves in the reverse osmosis component, and introduces the water in the cleaning water tank into the reverse osmosis component to clean the reverse osmosis component and then discharge it through the reverse osmosis water outlet tank.

[0029] The application of the technical solution of the present invention has at least the following beneficial effects:

[0030] (1) The present invention provides an integrated water treatment system, which includes an electro-flocculation unit, an ultrafiltration unit and a reverse osmosis unit arranged in sequence along the direction of water purification, and can solve the problems existing in the use of a single water treatment method. Specifically, the electro-flocculation unit can achieve the effect of flocculating suspended solids in the water through electrolysis without the need to add chemical flocculants; the combined use of the ultrafiltration unit and the reverse osmosis unit can not only effectively remove colloids, macromolecular organic matter and bacteria in the water, but also effectively remove soluble salts and heavy metal ions in the water, greatly improving the quality of the purified water. The present invention uses a backwash component and a cleaning component to extend the service life of the ultrafiltration membrane and the reverse osmosis membrane and reduce operating costs; the present invention uses a third security filter to purify the water quality and prevent the reverse osmosis membrane from being blocked.

[0031] (2) The application method of the integrated water treatment system provided in the present invention can realize automatic water purification and is easy to operate and maintain.

[0032] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0034] Figure 1 is a schematic flow chart of an integrated water treatment system in an embodiment of the present invention;

[0035] Figure 2 is a schematic diagram of the structure of the electroflocculation unit;

[0036] Figure 3 is a schematic diagram of the structure of an ultrafiltration unit;

[0037] Figure 4 is a schematic diagram of the structure of a reverse osmosis unit;

[0038] Among them, 1. reaction tank, 1.1. reaction zone, 1.2. flocculation zone, 1.3. sedimentation zone, 1.4. electroflocculation water production zone, 2. stirring device, 3. inclined plate, 4. filter tank, 5. ultrafiltration water tank, 6. ultrafiltration outlet tank, 7. ultrafiltration membrane single piece, 8. backwash water tank, 9. backwash pump, 10. first safety filter, 11. water inlet pump, 12. third safety filter, 13. high-pressure pump, 14. reverse osmosis membrane single piece, 15. water production tank, 16. reverse osmosis outlet tank, 17. cleaning water tank, 18. cleaning pump, 19. second safety filter. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0040] Example:

[0041] See also Figure 1 , an integrated water treatment system, comprising an electro-flocculation unit, an ultrafiltration unit and a reverse osmosis unit arranged in sequence along the direction of water purification;

[0042] See also Figure 2 The electro-flocculation unit comprises an electrode (not shown in the figure) and a reaction tank 1 (made of polyvinyl chloride or glass fiber reinforced plastic, which is corrosion-resistant; the volume of the reaction tank 1 is 5L); a reaction zone 1.1, a flocculation zone 1.2, a sedimentation zone 1.3 and an electro-flocculation water production zone 1.4 are sequentially arranged in the reaction tank 1 along the direction of water purification; the electrode is plate-shaped or mesh-shaped, and is arranged in the reaction zone 1.1 and connected to a power source;

[0043] See also Figure 3 , the ultrafiltration unit includes an ultrafiltration water tank 5, an ultrafiltration water outlet tank 6, a backwash component and an ultrafiltration component; the ultrafiltration component includes a plurality of ultrafiltration membrane units 7 arranged in parallel (the ultrafiltration membrane unit 7 can be selected from hollow fiber membrane elements, rolled membrane elements or tubular membrane elements, and hollow fiber membrane elements are selected specifically; the material of the ultrafiltration membrane can be selected from polyvinylidene fluoride, polyethersulfone or cellulose acetate, and polyvinylidene fluoride is selected specifically), and the water inlet end of each of the ultrafiltration membrane units 7 is connected to the electric flocculation water production area 1.4, the ultrafiltration purified water outlet end of each of the ultrafiltration membrane units 7 is connected to the ultrafiltration water tank 5, and the ultrafiltration concentrated liquid outlet end of each of the ultrafiltration membrane units 7 is connected to the ultrafiltration water outlet tank 6; the backwash component is connected to the ultrafiltration water outlet tank 6 via the ultrafiltration component;

[0044] See also Figure 4 The reverse osmosis unit includes a cleaning component and a water inlet pump 11, a third security filter 12 (specifically PP cotton, used to filter impurities in the water body to avoid clogging the reverse osmosis component), a high-pressure pump 13 and a reverse osmosis component arranged in sequence along the water purification direction; the reverse osmosis component includes a plurality of reverse osmosis membrane units 14 (the material of the reverse osmosis membrane is a polyamide composite membrane) arranged in parallel, and the water inlet end of each reverse osmosis membrane unit 14 is connected to the ultrafiltration water tank 5, the reverse osmosis purified water outlet end of each reverse osmosis membrane unit 14 is connected to the water production tank 15, and the reverse osmosis concentrated liquid outlet end of each reverse osmosis membrane unit 14 is connected to the reverse osmosis water outlet tank 16; the cleaning component forms a cleaning loop with the high-pressure pump 13 and the reverse osmosis component.

[0045] A first safety filter 10 is also arranged between the electro-flocculation unit and the ultrafiltration unit; the first safety filter 10 is PP cotton and is used to filter impurities in the water body to avoid clogging of the ultrafiltration component.

[0046] A stirring device 2 (specifically a stirring pump) is provided in the flocculation zone 1.2, and the stirring speed is controlled to be 50-200 r / min (specifically 150 r / min) to improve the efficiency of the electroflocculation;

[0047] An inclined plate 3 for sludge sedimentation is provided in the sedimentation area 1.3; a water filter trough 4 (specifically a sawtooth-shaped water filter trough 4, which effectively disperses the water flow through the sawtooth structure, reduces the impact of the water flow on the electric flocculation water production area 1.4, thereby extending its service life) is provided above the inclined plate 3; a sludge hopper is provided below the inclined plate 3; the sludge hopper is connected to the sludge storage tank, and the sludge in the sludge storage tank is filtered by a filter press;

[0048] The electrodes include an anode and a cathode, both of which are plate-like structures, with a length of 900 mm, a width of 400 mm, and a thickness of 10 mm, so as to increase the electrolysis area and improve the electrolysis efficiency.

[0049] The operating principle of the electro-flocculation unit is as follows:

[0050] See also Figure 2 When the wastewater flows into the reaction zone 1.1, the metal ions on the anode surface are electrolyzed into the water, and the water on the cathode surface is hydrolyzed into hydrogen and hydroxide ions. The electrons flow freely from the cathode to the anode to destroy the charge stability on the surface of the suspended solids in the wastewater. Under the buoyancy of the hydrogen bubbles, the metal ions react with more suspended solids to form large floccules; the floccules are pushed by the water flow into the flocculation zone 1.2, and further flocculate under the stirring action; then, under the action of the water flow, they flow into the sedimentation zone 1.3, and the suspended particles in the water will slide along the surface of the inclined plate 3 to the sludge hopper at the bottom under the action of gravity, while the clarified water flows upward, and after being collected through the channels between the inclined plates 3, they flow into the electric flocculation water production zone 1.4 through the filter tank 4.

[0051] A pH adjusting device (not shown in the figure) is provided on the ultrafiltration purified water outlet end of each ultrafiltration membrane unit 7; an acid-base pH adjusting agent is filled in the pH adjusting device to adjust the pH value of the ultrafiltration purified water.

[0052] A booster pump (not shown in the figure), a flow regulating valve and a pressure sensor (not shown in the figure) are also arranged on the pipeline connecting the electro-flocculation unit and the ultrafiltration unit;

[0053] See also Figure 3The water inlet of each ultrafiltration membrane unit 7 is connected to the electric flocculation water production area 1.4 through a flow regulating valve, the ultrafiltration purified water outlet of each ultrafiltration membrane unit 7 is connected to the ultrafiltration water tank 5 through a flow regulating valve, and the ultrafiltration concentrated liquid outlet of each ultrafiltration membrane unit 7 is connected to the ultrafiltration water outlet tank 6 through a flow regulating valve;

[0054] The backwash component includes a backwash water tank 8, a backwash pump 9 and a flow regulating valve; the water inlet end of the backwash pump 9 is connected to the backwash water tank 8, and the flow regulating valve is arranged on the pipeline connecting the two; the water outlet end of the backwash pump 9 is connected to the ultrafiltration outlet tank 6 through the ultrafiltration component, and the flow regulating valve is arranged on the pipeline connecting the water outlet end of the backwash pump 9 and the ultrafiltration component and on the pipeline connecting the ultrafiltration component and the ultrafiltration outlet tank 6.

[0055] See also Figure 4 The water inlet of each reverse osmosis membrane unit 14 is connected to the ultrafiltration water tank 5 through a flow regulating valve, the reverse osmosis purified water outlet of each reverse osmosis membrane unit 14 is connected to the production water tank 15 through a flow regulating valve, and the reverse osmosis concentrated liquid outlet of each reverse osmosis membrane unit 14 is connected to the reverse osmosis water outlet tank 16 through a flow regulating valve;

[0056] The cleaning component includes a cleaning water tank 17, a cleaning pump 18, a second safety filter 19 and a flow regulating valve; the water inlet end of the cleaning pump 18 is connected to the cleaning water tank 17, and the water outlet end is connected to the water inlet end of the second security filter 19 through the flow regulating valve; the water outlet end of the second security filter 19 is connected to the water inlet end of the high-pressure pump 13 through the flow regulating valve; the water outlet end of the high-pressure pump 13 is connected to the water inlet end of the reverse osmosis component; the water outlet end of the reverse osmosis component is connected to the cleaning water tank 17 through the flow regulating valve; the second security filter 19 is PP cotton, which is used to filter impurities in the water body to avoid clogging the reverse osmosis component.

[0057] See also Figure 4 The reverse osmosis unit also includes an energy recovery pipeline 20; the water inlet end of the energy recovery pipeline 20 is connected to the reverse osmosis concentrate water outlet end of each reverse osmosis membrane unit 14, and its water outlet end is connected to the water inlet end of the high-pressure pump 13; a flow regulating valve is arranged on the energy recovery pipeline 20.

[0058] The integrated water treatment system also includes a PLC controller; the PLC controller is respectively connected to the power supply, the water inlet pump 11, the high-pressure pump 13, the pH adjustment device, each of the flow regulating valves, the pressure sensor, the booster pump, the backwash pump 9 and the cleaning pump 18.

[0059] The application method of the integrated water treatment system includes:

[0060] Step S1, before the wastewater (specifically printing and dyeing wastewater, whose main components include dyes, slurries, additives, oils, acids and alkalis, fiber impurities, sand substances and inorganic salts, etc.) flows into the reaction zone 1.1 in the reaction tank 1, it first passes through the grid and the neutralization tank in sequence, and then enters the reaction zone 1.1, and the PLC controller turns on the power supply to complete the electrolysis operation of the wastewater; wherein the PLC controller sets the current size to 20-600A (specifically 50A), and the electrolysis time to 5-30min (specifically 15min); the electrolyzed wastewater flows into the electric flocculation water production zone 1.4 in sequence through the flocculation zone 1.2 and the sedimentation zone 1.3 to obtain primary purified water;

[0061] Step S2, the PLC controller opens the boost pump and the flow regulating valves on the ultrafiltration component, and obtains ultrafiltration purified water and ultrafiltration concentrated liquid after the primary purified water is ultrafiltered and purified by the ultrafiltration component. The ultrafiltration purified water flows into the ultrafiltration water tank 5, and the ultrafiltration concentrated liquid flows into the ultrafiltration water outlet tank 6; during ultrafiltration purification, the PLC controller adjusts the operating pressure of the boost pump to 0.1-0.6MPa (specifically 0.3MPa), and monitors the operating pressure of the boost pump in real time through the pressure sensor; the PLC controller controls the water inlet flux during ultrafiltration purification to be 50-200L / m 2 (Specifically 100L / m 2 ); the ultrafiltration membrane of each ultrafiltration membrane unit 7 has a molecular weight cutoff of 1000 to 100000 (specifically 50000) Daltons; the PLC controller controls the pH adjustment device to adjust the pH value of the ultrafiltration purified water to 6.5 to 7.5 (specifically 7.0);

[0062] Step S3, the PLC controller turns on the water inlet pump 11, the high-pressure pump 13 and each of the flow regulating valves in the reverse osmosis component, and the ultrafiltration purified water flows from the ultrafiltration water tank 5 into the reverse osmosis component to obtain reverse osmosis purified water and reverse osmosis concentrated liquid after reverse osmosis purification. The reverse osmosis purified water flows into the water production tank 15 for supplying water to the water use point, and the reverse osmosis concentrated liquid flows into the reverse osmosis water outlet tank 16; wherein, the PLC controller turns on the flow regulating valve on the energy recovery pipeline 20 to recover the initial reverse osmosis concentrated liquid, and completes the secondary purification through the high-pressure pump 13 and the reverse osmosis component to increase the water production rate; the PLC controller controls the operating pressure of the high-pressure pump 13 to be 1-10MPa (specifically 3MPa).

[0063] The application method also includes backwashing and / or forward washing of the ultrafiltration component to avoid clogging of the ultrafiltration component and extend the service life of the ultrafiltration component;

[0064] During backwashing, the PLC controller turns on the backwash pump 9 and the flow regulating valves in the backwash assembly, introduces the water in the backwash water tank 8 into the ultrafiltration assembly, realizes the backwashing of the ultrafiltration assembly, and then discharges it through the ultrafiltration outlet tank 6; the backwashing operation time is 30 to 60 seconds (specifically 45 seconds); the backwashing interval period is 30 to 120 minutes (specifically 60 minutes);

[0065] During the normal washing, the operation process in step S2 is followed;

[0066] The application method also includes cleaning the reverse osmosis component to avoid clogging of the reverse osmosis component and extend the service life of the reverse osmosis component; the PLC controller turns on the cleaning pump 18, the flow regulating valves in the cleaning component, the high-pressure pump 13 and the flow regulating valves in the reverse osmosis component, and introduces the water in the cleaning water tank 17 into the reverse osmosis component to clean the reverse osmosis component and then discharge it through the reverse osmosis water outlet tank 16.

[0067] After the wastewater is treated by the integrated water treatment system, the water quality can reach the level of "Comprehensive Sewage Discharge Standard" (GB8978-1996).

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An integrated water treatment system, characterized in that: It includes an electric flocculation unit, an ultrafiltration unit and a reverse osmosis unit which are sequentially arranged along the direction of water purification; The electro-flocculation unit comprises an electrode and a reaction tank (1); a reaction zone (1.1), a flocculation zone (1.2), a sedimentation zone (1.3) and an electro-flocculation water production zone (1.4) are sequentially arranged in the reaction tank (1) along the direction of water purification; the electrode is plate-shaped or mesh-shaped, and is arranged in the reaction zone (1.1) and connected to a power source; The ultrafiltration unit comprises an ultrafiltration water tank (5), an ultrafiltration water outlet tank (6), a backwash component and an ultrafiltration component; the ultrafiltration component comprises a plurality of ultrafiltration membrane units (7) arranged in parallel, and the water inlet of each ultrafiltration membrane unit (7) is connected to the electro-flocculation water production area (1.4), the ultrafiltration purified water outlet of each ultrafiltration membrane unit (7) is connected to the ultrafiltration water tank (5), and the ultrafiltration concentrated liquid outlet of each ultrafiltration membrane unit (7) is connected to the ultrafiltration water outlet tank (6); the backwash component is connected to the ultrafiltration water outlet tank (6) via the ultrafiltration component; The reverse osmosis unit comprises a cleaning component and a water inlet pump (11), a third safety filter (12), a high-pressure pump (13) and a reverse osmosis component which are sequentially arranged along the water purification direction; the reverse osmosis component comprises a plurality of reverse osmosis membrane units (14) which are arranged in parallel, and the water inlet end of each reverse osmosis membrane unit (14) is connected to the ultrafiltration water tank (5), the reverse osmosis purified water outlet end of each reverse osmosis membrane unit (14) is connected to the production water tank (15), and the reverse osmosis concentrated liquid outlet end of each reverse osmosis membrane unit (14) is connected to the reverse osmosis water outlet tank (16); the cleaning component forms a cleaning loop with the high-pressure pump (13) and the reverse osmosis component.

2. The integrated water treatment system according to claim 1, characterized in that: A first safety filter (10) is also arranged between the electro-flocculation unit and the ultrafiltration unit; the first safety filter (10) comprises PP cotton.

3. The integrated water treatment system according to claim 1, characterized in that: A stirring device (2) is provided in the flocculation zone (1.2); An inclined plate (3) for sludge sedimentation is provided in the sedimentation area (1.3); a water filter tank (4) connected to the electric flocculation water production area (1.4) is provided above the inclined plate (3); and a sludge hopper is provided below the inclined plate (3); The electrodes include an anode and a cathode, both of which are plate-shaped structures with a length of 850 to 950 mm, a width of 350 to 450 mm, and a thickness of 5 to 15 mm.

4. The integrated water treatment system according to claim 1, characterized in that: A pH regulating device is arranged on the outlet end of the ultrafiltration purified water of each ultrafiltration membrane unit (7); and an acid-base pH regulating agent is filled in the pH regulating device.

5. The integrated water treatment system according to claim 4, characterized in that: A booster pump, a flow regulating valve and a pressure sensor are also arranged on the pipeline communicating between the electro-flocculation unit and the ultrafiltration unit; The water inlet of each ultrafiltration membrane unit (7) is connected to the electric flocculation water production area (1.4) through a flow regulating valve, the ultrafiltration purified water outlet of each ultrafiltration membrane unit (7) is connected to the ultrafiltration water tank (5) through a flow regulating valve, and the ultrafiltration concentrated liquid outlet of each ultrafiltration membrane unit (7) is connected to the ultrafiltration water outlet tank (6) through a flow regulating valve; The backwash component comprises a backwash water tank (8), a backwash pump (9) and a flow regulating valve; the water inlet end of the backwash pump (9) is connected to the backwash water tank (8), and the flow regulating valve is arranged on the pipeline connecting the two; the water outlet end of the backwash pump (9) is connected to the ultrafiltration water outlet tank (6) through the ultrafiltration component, and the flow regulating valve is arranged on the pipeline connecting the water outlet end of the backwash pump (9) and the ultrafiltration component and the pipeline connecting the ultrafiltration component and the ultrafiltration water outlet tank (6).

6. The integrated water treatment system according to claim 5, characterized in that: The water inlet of each reverse osmosis membrane unit (14) is connected to the ultrafiltration water tank (5) through a flow regulating valve, the reverse osmosis purified water outlet of each reverse osmosis membrane unit (14) is connected to the water production tank (15) through a flow regulating valve, and the reverse osmosis concentrated liquid outlet of each reverse osmosis membrane unit (14) is connected to the reverse osmosis water outlet tank (16) through a flow regulating valve; The cleaning component comprises a cleaning water tank (17), a cleaning pump (18), a second safety filter (19) and a flow regulating valve; the water inlet of the cleaning pump (18) is connected to the cleaning water tank (17), and the water outlet is connected to the water inlet of the second safety filter (19) through the flow regulating valve; the water outlet of the second safety filter (19) is connected to the water inlet of the high-pressure pump (13) through the flow regulating valve; the water outlet of the high-pressure pump (13) is connected to the water inlet of the reverse osmosis component; the water outlet of the reverse osmosis component is connected to the cleaning water tank (17) through the flow regulating valve; the second safety filter (19) comprises PP cotton.

7. The integrated water treatment system according to claim 6, characterized in that: The reverse osmosis unit further comprises an energy recovery pipeline (20); the water inlet end of the energy recovery pipeline (20) is connected to the reverse osmosis concentrated liquid water outlet end of each reverse osmosis membrane unit (14), and the water outlet end thereof is connected to the water inlet end of the high-pressure pump (13); and a flow regulating valve is arranged on the energy recovery pipeline (20).

8. The integrated water treatment system according to claim 7, characterized in that: It also includes a PLC controller; the PLC controller is respectively connected to the power supply, the water inlet pump (11), the high-pressure pump (13), the pH adjustment device, each of the flow regulating valves, the pressure sensor, the booster pump, the backwash pump (9) and the cleaning pump (18).

9. An application method of the integrated water treatment system according to claim 8, characterized in that: include: Step S1, when wastewater flows into the reaction zone (1.1) in the reaction tank (1), the PLC controller turns on the power supply to complete the electrolysis of the wastewater; wherein the PLC controller sets the current to 20 to 600A and the electrolysis time to 5 to 30 minutes; the electrolyzed wastewater flows into the electric flocculation water production zone (1.4) in sequence through the flocculation zone (1.2) and the sedimentation zone (1.3) to obtain primary purified water; Step S2, the PLC controller opens the boost pump and the flow regulating valves on the ultrafiltration component, and obtains ultrafiltration purified water and ultrafiltration concentrated liquid after the primary purified water is ultrafiltered and purified by the ultrafiltration component. The ultrafiltration purified water flows into the ultrafiltration water tank (5), and the ultrafiltration concentrated liquid flows into the ultrafiltration water outlet tank (6); during ultrafiltration purification, the PLC controller adjusts the operating pressure of the boost pump to 0.1-0.6MPa, and monitors the operating pressure of the boost pump in real time through the pressure sensor; the PLC controller controls the water inlet flux during ultrafiltration purification to be 50-200L / m 2 ; The ultrafiltration membrane used in each of the ultrafiltration membrane units (7) has a molecular weight cutoff of 1000 to 100000 Daltons; the PLC controller controls the pH adjustment device to adjust the pH value of the ultrafiltration purified water to 6.5 to 7.5; Step S3, the PLC controller opens the water inlet pump (11), the high-pressure pump (13) and each of the flow regulating valves in the reverse osmosis component, and the ultrafiltration purified water flows from the ultrafiltration water tank (5) into the reverse osmosis component to obtain reverse osmosis purified water and reverse osmosis concentrated liquid after reverse osmosis purification, the reverse osmosis purified water flows into the water production tank (15), and the reverse osmosis concentrated liquid flows into the reverse osmosis water outlet tank (16); wherein, the PLC controller opens the flow regulating valve on the energy recovery pipeline (20) to recover the initial reverse osmosis concentrated liquid, and completes the secondary purification through the high-pressure pump (13) and the reverse osmosis component to increase the water production rate; the PLC controller controls the operating pressure of the high-pressure pump (13) to be 1 to 10 MPa.

10. The application method of the integrated water treatment system according to claim 9, characterized in that: The application method also includes backwashing and / or forward washing of the ultrafiltration component; During backwashing, the PLC controller turns on the backwash pump (9) and the flow regulating valves in the backwash component, and introduces the water in the backwash water tank (8) into the ultrafiltration component to achieve backwashing of the ultrafiltration component, and then discharges the water through the ultrafiltration outlet tank (6); the backwashing operation time is 30 to 60 seconds; and the backwashing interval period is 30 to 120 minutes; During the normal washing, the operation process in step S2 is followed; The application method also includes cleaning the reverse osmosis component; the PLC controller starts the cleaning pump (18), the flow regulating valves in the cleaning component, the high-pressure pump (13) and the flow regulating valves in the reverse osmosis component, and introduces water in the cleaning water tank (17) into the reverse osmosis component to clean the reverse osmosis component and then discharge the water through the reverse osmosis water outlet tank (16).

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