Membrane process system for treating high-turbidity wastewater

Abstract

The utility model belongs to the field of flaw detection, and particularly relates to a membrane process system for treating high-turbidity wastewater, which comprises an air flotation flocculation precipitation system and an ultrafiltration system, the air flotation flocculation precipitation system comprises a mixing tank, a flocculant dosing device, a flocculant dosing pump, a mixing and stirring device, a dissolved air tank, a reaction tank, a sludge hopper, a clean water tank, an automatic slag scraping device, a scum collecting tank, a dissolved air release device, a reflux dissolved air pump, an air flotation air compressor and a dissolved air tank; the ultrafiltration system comprises an ultrafiltration raw water tank, an ultrafiltration water inlet pump, an ultrafiltration membrane assembly, a backwashing pump, an ultrafiltration air compressor and an ultrafiltration water producing tank. Through the air floatation flocculation precipitation system, the utilization rate of the system is improved, the occupied area is reduced, the treatment effect of the system is improved, and higher effluent quality is obtained through the synergistic effect of air floatation and flocculation precipitation in the same reaction area.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a membrane process system for treating high-turbidity wastewater. Background Art

[0002] In some industrial production, a certain amount of high-turbidity wastewater is often produced, such as flue gas absorption liquid, mud liquid, and coal sludge water for washing coal sludge. High turbidity water will cause difficulties in conventional treatment processes if not properly treated. Suspended matter will block pipes, sedimentation tanks, and membrane systems, reducing water treatment efficiency. The traditional system for treating high turbidity water alone adopts the treatment measures of primary sedimentation-coagulation-secondary sedimentation-filtration. There are disadvantages of large footprint and long process flow caused by the two-time sedimentation method; sedimentation tank-sand filter-effluent reuse has the disadvantages of long process flow, large footprint, high operating cost, poor quality of effluent with sand, unstable sand filtration performance, etc. The filter material of the sand filter is easy to compact and deflect, the filter material has a short service life and is frequently replaced and supplemented. During backwashing, the filter material impacts the filter screen and waterway, and the spray system is easy to be blocked, which will cause the quality of the recycled water to be unable to be stable for a long time.

[0003] The existing technology uses ultrafiltration technology to treat some high-turbidity wastewater. The existing ultrafiltration technology has the advantages of small footprint, stable effluent quality, high degree of automation, etc. However, the existing ultrafiltration technology is restricted by membrane pollution, which shortens the service life of the membrane. This has always been a key issue restricting the widespread application of ultrafiltration technology in water treatment. Utility Model Content

[0004] The utility model aims to solve the shortcomings of the conventional sedimentation and sand filtration processes in the prior art when treating high turbidity wastewater, such as large floor space, complex operation and unstable treatment effect, and proposes a membrane process system for treating high turbidity wastewater.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A membrane process system for treating high turbidity wastewater, including an air flotation flocculation sedimentation system and an ultrafiltration system.

[0007] The flotation flocculation sedimentation system includes a mixing tank, a flocculant dosing device, a flocculant dosing pump, a mixing and stirring device, an air dissolving tank, a reaction tank, a sludge hopper, a clear water tank, an automatic scraping device, a scum collecting tank, a dissolved air release device, a reflux dissolved air pump, an air flotation compressor and an air dissolving tank;

[0008] A tank body is sequentially divided into the mixing tank, the air dissolving tank, the reaction tank and the clean water tank, the mixing tank is connected with the air dissolving tank, a baffle is arranged between the mixing tank and the air dissolving tank, used to form a passage from the middle of the mixing tank to the upper and lower ends of the air dissolving tank, the air dissolving tank is connected with the reaction tank, an inclined plate is arranged between the air dissolving tank and the reaction tank, used to form a water flow and sludge passage from the middle of the air dissolving tank to the upper and lower parts of the reaction tank, the lower part of the reaction tank is provided with the inclined sludge hopper, used to collect settled sludge, the clean water tank is connected with the reaction tank, a baffle is arranged between the clean water tank and the reaction tank, used to form a water flow and sludge passage from the middle of the reaction tank to the upper and lower parts of the clean water tank, and the scum collection tank is arranged on the upper water surface of the reaction tank;

[0009] The flocculant dosing device is connected to the flocculant dosing pump, and the flocculant dosing pump is connected to the mixing tank through a dosing pipeline, and is used to add flocculant to the mixing tank;

[0010] The mixing and stirring device is arranged at the middle position of the upper part of the mixing tank to make the flocculant fully contact with the wastewater;

[0011] The dissolved air release device is provided at the lower part of the dissolved air pool for forming tiny bubbles;

[0012] The automatic scraping device is provided on the water surface above the reaction pool for collecting and removing scum; the automatic scraping device can be fixed on the water surface above the reaction pool by fixing it on the building bodies on both sides of the reaction pool, or by setting a support frame;

[0013] The mixing tank is provided with a water inlet at the top, and the clean water tank is provided with a water outlet at the top; the lower end of the mixing tank and the lower end of the sludge hopper are both provided with sludge discharge ports for discharging settled sludge;

[0014] The water inlet of the reflux dissolved air pump is connected to the water outlet of the upper part of the clean water tank through a pipeline, the water outlet of the reflux dissolved air pump is connected to the water inlet of the dissolved air tank, the air outlet of the air flotation air compressor is connected to the air inlet of the dissolved air tank, and the water outlet of the dissolved air tank is connected to the water inlet of the dissolved air release device, so as to provide pressurized dissolved air water to the dissolved air release device;

[0015] The ultrafiltration system includes an ultrafiltration raw water tank, an ultrafiltration water inlet pump, an ultrafiltration membrane assembly, a backwash pump, an ultrafiltration air compressor and an ultrafiltration water production tank.

[0016] The water inlet of the ultrafiltration raw water tank is connected to the water outlet of the clean water tank, the water outlet of the ultrafiltration raw water tank is connected to the ultrafiltration water inlet pump, and the ultrafiltration water inlet pump is connected to the water inlet of the ultrafiltration membrane assembly;

[0017] The bottom of the ultrafiltration membrane assembly is provided with an air intake and sewage discharge port for air intake and sewage discharge, the air intake and sewage discharge port of the ultrafiltration membrane assembly is connected to the air outlet of the ultrafiltration air compressor, the cross-flow port of the ultrafiltration membrane assembly is connected to the water inlet of the ultrafiltration raw water tank, and the water production port of the ultrafiltration membrane assembly is connected to the water inlet of the ultrafiltration water production tank;

[0018] The water inlet of the backwash pump is connected to the water outlet of the ultrafiltration water production tank, the water outlet of the backwash pump is connected to the water production port of the ultrafiltration membrane assembly, and the air inlet and sewage outlet of the ultrafiltration membrane assembly is connected to the mixing tank through a pipeline.

[0019] Preferably, the membrane filaments of the ultrafiltration membrane assembly are made of PTFE hollow fiber membrane, the internal membrane filaments are arranged in a U-shape, the U-shaped port is located at the upper part of the membrane shell and is sealed, the bottom of the ultrafiltration membrane assembly is provided with an ultrafiltration membrane assembly air inlet and sewage outlet, the lower part of the ultrafiltration membrane assembly is provided with an ultrafiltration membrane assembly water inlet, the upper part of the ultrafiltration membrane assembly is provided with an ultrafiltration membrane assembly cross-flow port, the top of the ultrafiltration membrane assembly is provided with an ultrafiltration membrane assembly water outlet, the inlet and outlet water pipeline layout structure of the ultrafiltration membrane assembly is convenient for maintenance and cleaning, and increases the anti-pollution performance of the ultrafiltration membrane.

[0020] Preferably, a first valve is provided at the water inlet of the mixing tank, a second valve is provided at the water outlet of the clear water tank, a third valve is provided at the connection between the flotation air compressor and the dissolved air tank, and a fourth valve is provided at the connection between the dissolved air tank and the dissolved air release device, so as to control the processing capacity and flotation effect of the flotation flocculation sedimentation system.

[0021] A thirteenth valve is arranged between the water outlet of the reflux air dissolving pump and the air dissolving tank.

[0022] Preferably, a fifth valve is provided at the mud outlet of the mixing tank, and a sixth valve is provided at the mud outlet of the sludge hopper, and the fifth valve and the sixth valve are used to control the mud discharge volume and flocculation effect of the flotation flocculation sedimentation system.

[0023] Preferably, a seventh valve is arranged between the ultrafiltration water inlet pump and the water inlet of the ultrafiltration membrane assembly, an eighth valve is arranged between the water outlet of the ultrafiltration membrane assembly and the ultrafiltration water production tank, and a ninth valve is arranged between the cross-flow outlet of the ultrafiltration membrane assembly and the ultrafiltration raw water tank. The seventh valve, the eighth valve and the ninth valve are used to control the processing capacity and processing effect of the ultrafiltration system.

[0024] Preferably, a tenth valve is arranged between the water outlet of the backwash pump and the water outlet of the ultrafiltration membrane assembly, an eleventh valve is arranged between the air outlet of the ultrafiltration air compressor and the air inlet and sewage outlet of the ultrafiltration membrane assembly, and a twelfth valve is arranged between the air inlet and sewage outlet of the ultrafiltration membrane assembly and the mixing tank. The tenth valve, the eleventh valve and the twelfth valve are used to control the cleaning of the ultrafiltration system.

[0025] Preferably, a first flowmeter is arranged at the water inlet of the mixing tank, a second flowmeter is arranged at the water outlet of the clear water tank, a third flowmeter is arranged at the water outlet of the reflux dissolved air pump, a fourth flowmeter is arranged at the air outlet of the flotation air compressor, a fifth flowmeter is arranged at the water outlet of the dissolved air tank, a sixth flowmeter is arranged at the cross-flow outlet of the ultrafiltration membrane assembly, a seventh flowmeter is arranged at the water outlet of the ultrafiltration membrane assembly, an eighth flowmeter is arranged at the water outlet of the backwash pump, and a ninth flowmeter is arranged at the air outlet of the ultrafiltration air compressor. The first flowmeter, the second flowmeter, the third flowmeter, the fourth flowmeter, the fifth flowmeter, the sixth flowmeter, the seventh flowmeter, the eighth flowmeter and the ninth flowmeter are used to detect the flow of each system link.

[0026] Preferably, a first pressure gauge is provided at the water inlet of the dissolved air tank, a second pressure gauge is provided at the air inlet of the dissolved air tank, a third pressure gauge is provided at the water outlet of the dissolved air tank, a fourth pressure gauge is provided at the water inlet of the ultrafiltration membrane assembly, a fifth pressure gauge is provided at the water outlet of the ultrafiltration membrane assembly, a sixth pressure gauge is provided at the water outlet of the backwash pump, and a seventh pressure gauge is provided at the air inlet and sewage outlet of the ultrafiltration membrane assembly. The first pressure gauge, the second pressure gauge, the third pressure gauge, the fourth pressure gauge, the fifth pressure gauge and the sixth pressure gauge are used to monitor the pressure and pressure difference of each pressure equipment to ensure the normal operation of the equipment.

[0027] Beneficial effects:

[0028] 1. The flotation flocculation sedimentation system uses flotation and flocculation sedimentation to work synergistically in the same reaction zone to improve the utilization rate of the system, reduce the floor space, and at the same time improve the treatment effect of the system to obtain better effluent water quality.

[0029] 2. Applying the flotation flocculation sedimentation system to the pretreatment technology of the ultrafiltration system not only ensures the stability of the inlet and outlet water of the ultrafiltration system, but also reduces the pollution of the ultrafiltration membrane by high turbidity wastewater, prolongs the service life of the ultrafiltration membrane and reduces economic costs.

[0030] 3. Overall, the effluent quality of this process is stable, and the effluent turbidity and pollutant concentration are significantly reduced, which means that the water inlet requirements of other subsequent membrane processes can be met; in specific applications, the operation is stable and reliable, and the turbidity removal effect is significant, providing an economically feasible and simple system for treating high-turbidity wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of a membrane process system for treating high turbidity wastewater according to the utility model;

[0032] Figure 2 It is a structural schematic diagram of a flocculant dosing device of a membrane process system for treating high turbidity wastewater of the utility model;

[0033] Figure 3 It is a system schematic diagram of the air flotation flocculation sedimentation system of the membrane process system for treating high turbidity wastewater of the utility model;

[0034] Figure 4 This is a system schematic diagram of an ultrafiltration system of a membrane process system for treating high-turbidity wastewater according to the utility model.

[0035] In the figure: A, air flotation flocculation sedimentation system; B, ultrafiltration system; 1, mixing tank; 2, flocculant dosing device; 3, flocculant dosing pump; 4, mixing and stirring device; 5, dissolved air tank; 6, reaction tank; 7, sludge hopper; 8, clean water tank; 9, automatic scraping device; 10, scum collection tank; 11, dissolved air release device; 12, reflux dissolved air pump; 13, air flotation air compressor; 14, dissolved air tank; 15, ultrafiltration raw water tank; 16, ultrafiltration water inlet pump; 17, ultrafiltration membrane assembly; 18, backwash pump; 19, ultrafiltration air compressor; 20, ultrafiltration water tank; 21, valve; 22, flow meter; 23, pressure gauge; 110, tenth valve; 111, eleventh valve; 112, twelfth valve; 113, thirteenth valve; 201, membrane wire; 202, ultrafiltration membrane assembly water inlet; 203, Cross-flow port of ultrafiltration membrane assembly; 204, water outlet of ultrafiltration membrane assembly; 205, air inlet and sewage outlet of ultrafiltration membrane assembly; 211, first valve; 212, second valve; 213, third valve; 214, fourth valve; 215, fifth valve; 216, sixth valve; 217, seventh valve; 218, eighth valve; 219, ninth valve; 221, first flow meter; 222, second flow meter; 223, third flow meter; 224, fourth flow meter; 225, fifth flow meter; 226, sixth flow meter; 227, seventh flow meter; 228, eighth flow meter; 229, ninth flow meter; 231, first pressure gauge; 232, second pressure gauge; 233, third pressure gauge; 234, fourth pressure gauge; 235, fifth pressure gauge; 236, sixth pressure gauge. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0037] Example 1

[0038] Reference Figure 1-Figure 4 , a membrane process system for treating high turbidity wastewater, including a flotation flocculation sedimentation system A and an ultrafiltration system B,

[0039] The air flotation flocculation sedimentation system A comprises a mixing tank 1, a flocculant dosing device 2, a flocculant dosing pump 3, a mixing and stirring device 4, an air dissolving tank 5, a reaction tank 6, a sludge hopper 7, a clear water tank 8, an automatic scraping device 9, a floating slag collection tank 10, an air dissolving release device 11, a reflux air dissolving pump 12, an air flotation air compressor 13 and an air dissolving tank 14;

[0040] A tank body is divided into the mixing tank 1, the air dissolving tank 5, the reaction tank 6 and the clean water tank 8 in sequence. The mixing tank 1 is connected with the air dissolving tank 5. A baffle is arranged between the mixing tank 1 and the air dissolving tank 5 to form a passage from the middle of the mixing tank 1 to the upper and lower ends of the air dissolving tank 5. The air dissolving tank 5 is connected with the reaction tank 6. An inclined plate is arranged between the air dissolving tank 5 and the reaction tank 6 to form a water flow and sludge passage from the middle of the air dissolving tank 5 to the upper and lower parts of the reaction tank 6. The lower part of the reaction tank 6 is provided with an inclined sludge hopper 7 to collect settled sludge. The clean water tank 8 is connected with the reaction tank 6. A baffle is arranged between the clean water tank 8 and the reaction tank 6 to form a water flow and sludge passage from the middle of the reaction tank 6 to the upper and lower parts of the clean water tank 8. The upper water surface of the reaction tank 6 is provided with the scum collecting tank 10;

[0041] The flocculant dosing device 2 is connected to the flocculant dosing pump 3, and the flocculant dosing pump 3 is connected to the mixing tank 1 through a dosing pipeline, and is used to add flocculants to the mixing tank 1;

[0042] The mixing and stirring device 4 is arranged in the middle of the upper part of the mixing tank 1 to make the flocculant fully contact with the wastewater;

[0043] The dissolved gas release device 11 is provided at the lower part of the dissolved gas pool 5 for forming tiny bubbles;

[0044] The automatic scraper 9 is provided on the water surface above the reaction pool 6 for collecting and removing scum; the automatic scraper 9 can be fixed on the building bodies on both sides of the reaction pool 6, or by providing a support frame, so as to be fixed on the water surface above the reaction pool 6;

[0045] The mixing tank 1 has a water inlet at the top, and the clean water tank 8 has a water outlet at the top; the mixing tank 1 and the sludge hopper 7 both have mud discharge ports at the bottom to discharge the settled sludge;

[0046] The water inlet of the reflux dissolved air pump 12 is connected to the upper water outlet of the clean water tank 8 through a pipeline, the water outlet of the reflux dissolved air pump 12 is connected to the water inlet of the dissolved air tank 14, the air outlet of the air flotation air compressor 13 is connected to the air inlet of the dissolved air tank 14, and the water outlet of the dissolved air tank 14 is connected to the water inlet of the dissolved air release device 11, so as to provide pressurized dissolved air water to the dissolved air release device 11;

[0047] The ultrafiltration system B includes an ultrafiltration raw water tank 15, an ultrafiltration water inlet pump 16, an ultrafiltration membrane assembly 17, a backwash pump 18, an ultrafiltration air compressor 19 and an ultrafiltration water production tank 20:

[0048] The water inlet of the ultrafiltration raw water tank 15 is connected to the water outlet of the clean water tank 8, the water outlet of the ultrafiltration raw water tank 15 is connected to the ultrafiltration water inlet pump 16, and the ultrafiltration water inlet pump 16 is connected to the water inlet of the ultrafiltration membrane assembly 17;

[0049] The bottom of the ultrafiltration membrane assembly 17 is provided with an air intake and sewage discharge port for air intake and sewage discharge, the air intake and sewage discharge port of the ultrafiltration membrane assembly 17 is connected to the air outlet of the ultrafiltration air compressor 19, the cross-flow port of the ultrafiltration membrane assembly 17 is connected to the water inlet of the ultrafiltration raw water tank 15, and the water production port of the ultrafiltration membrane assembly 17 is connected to the water inlet of the ultrafiltration water production tank 20;

[0050] The water inlet of the backwash pump 18 is connected to the water outlet of the ultrafiltration water production tank 20, the water outlet of the backwash pump 18 is connected to the water production port of the ultrafiltration membrane assembly 17, and the air inlet and sewage outlet of the ultrafiltration membrane assembly 17 is connected to the mixing tank 1 through a pipeline.

[0051] Preferably, the membrane filament 201 of the ultrafiltration membrane assembly 17 is made of PTFE hollow fiber membrane, and the membrane filament 201 inside is arranged in a U shape, the U-shaped port is located at the upper part of the membrane shell and is sealed, an ultrafiltration membrane assembly air inlet and sewage outlet 205 is arranged at the bottom of the ultrafiltration membrane assembly 17, an ultrafiltration membrane assembly water inlet 202 is arranged at the lower part of the ultrafiltration membrane assembly 17, an ultrafiltration membrane assembly cross-flow port 203 is arranged at the upper part of the ultrafiltration membrane assembly 17, and an ultrafiltration membrane assembly water outlet 204 is arranged at the top of the ultrafiltration membrane assembly 17. The inlet and outlet water pipeline layout structure of the ultrafiltration membrane assembly 17 is convenient for maintenance and cleaning, and increases the anti-pollution performance of the ultrafiltration membrane.

[0052] Preferably, a first valve 211 is provided at the water inlet of the mixing tank 1, a second valve 212 is provided at the water outlet of the clear water tank 8, a third valve 213 is provided at the connection between the flotation air compressor 13 and the dissolved air tank 14, and a fourth valve 214 is provided at the connection between the dissolved air tank 14 and the dissolved air release device 11, so as to control the processing capacity and flotation effect of the flotation flocculation sedimentation system.

[0053] A thirteenth valve 113 is provided between the water outlet of the reflux air dissolving pump 12 and the air dissolving tank 14 .

[0054] Preferably, a fifth valve 215 is provided at the mud outlet of the mixing tank 1, and a sixth valve 216 is provided at the mud outlet of the sludge hopper 7. The fifth valve 215 and the sixth valve 216 are used to control the mud discharge volume and flocculation effect of the flotation flocculation sedimentation system.

[0055] Preferably, a seventh valve 217 is arranged between the ultrafiltration water inlet pump 16 and the water inlet of the ultrafiltration membrane assembly 17, an eighth valve 218 is arranged between the water outlet of the ultrafiltration membrane assembly 17 and the ultrafiltration water production tank 20, and a ninth valve 219 is arranged between the cross-flow outlet of the ultrafiltration membrane assembly 17 and the ultrafiltration raw water tank 15. The seventh valve 217, the eighth valve 218 and the ninth valve 219 are used to control the processing volume and processing effect of the ultrafiltration system.

[0056] Preferably, a tenth valve 110 is arranged between the water outlet of the backwash pump 18 and the water outlet of the ultrafiltration membrane assembly 17, an eleventh valve 111 is arranged between the air outlet of the ultrafiltration air compressor 19 and the air inlet and sewage outlet of the ultrafiltration membrane assembly 17, and a twelfth valve 112 is arranged between the air inlet and sewage outlet of the ultrafiltration membrane assembly 17 and the mixing tank 1. The tenth valve 110, the eleventh valve 111 and the twelfth valve 112 are used to control the cleaning of the ultrafiltration system.

[0057] Preferably, a first flowmeter 221 is provided at the water inlet of the mixing pool 1, a second flowmeter 222 is provided at the water outlet of the clear water pool 8, a third flowmeter 223 is provided at the water outlet of the reflux dissolved air pump 12, a fourth flowmeter 224 is provided at the air outlet of the flotation air compressor 13, a fifth flowmeter 225 is provided at the water outlet of the dissolved air tank 14, a sixth flowmeter 226 is provided at the cross flow outlet of the ultrafiltration membrane assembly 17, a seventh flowmeter 227 is provided at the water outlet of the ultrafiltration membrane assembly 17, an eighth flowmeter 228 is provided at the water outlet of the backwash pump 18, and a ninth flowmeter 229 is provided at the air outlet of the ultrafiltration air compressor 19. The first flowmeter 221, the second flowmeter 222, the third flowmeter 223, the fourth flowmeter 224, the fifth flowmeter 225, the sixth flowmeter 226, the seventh flowmeter 227, the eighth flowmeter 228 and the ninth flowmeter 229 are used to detect the flow of each system link.

[0058] Preferably, a first pressure gauge 231 is provided at the water inlet of the dissolved air tank 14, a second pressure gauge 232 is provided at the air inlet of the dissolved air tank 14, a third pressure gauge 233 is provided at the water outlet of the dissolved air tank 14, a fourth pressure gauge 234 is provided at the water inlet of the ultrafiltration membrane assembly 17, a fifth pressure gauge 235 is provided at the water outlet of the ultrafiltration membrane assembly 17, a sixth pressure gauge 236 is provided at the water outlet of the backwash pump 18, and a seventh pressure gauge 237 is provided at the air inlet and sewage outlet of the ultrafiltration membrane assembly 17. The first pressure gauge 231, the second pressure gauge 232, the third pressure gauge 233, the fourth pressure gauge 234, the fifth pressure gauge 235 and the sixth pressure gauge 236 are used to monitor the pressure and pressure difference of each pressure equipment to ensure the normal operation of the equipment.

[0059] The use of the above-mentioned membrane process system for treating high turbidity wastewater has the following advantages:

[0060] (1) The flotation and flocculation sedimentation system uses flotation and flocculation sedimentation in the same reaction zone to synergistically improve the utilization rate of the system, reduce the floor space, and at the same time improve the treatment effect of the system to obtain better effluent water quality.

[0061] (2) Applying the flotation flocculation sedimentation system to the pretreatment technology of the ultrafiltration system not only ensures the stability of the inlet and outlet water of the ultrafiltration system, but also reduces the pollution of the ultrafiltration membrane by high turbidity wastewater, prolongs the service life of the ultrafiltration membrane, and reduces economic costs.

[0062] (3) Overall, the process has stable effluent quality, and the effluent turbidity and pollutant concentration are significantly reduced, which means that the inlet requirements of other subsequent membrane processes can be met; in specific applications, the operation is stable and reliable, and the turbidity removal effect is significant, providing an economically feasible and simple system for treating high-turbidity wastewater.

[0063] In order to further illustrate the structure and application of ultrafiltration treatment system for high turbidity wastewater, the high turbidity wastewater produced by the hot air furnace process of a pharmaceutical production plant was taken as the experimental object to illustrate the relationship and function of each part of the system.

[0064] Example 2

[0065] The steps of treating wastewater by the high turbidity wastewater ultrafiltration treatment system in the above embodiment are as follows:

[0066] 1) Send high turbidity wastewater into the mixing tank 1, turn on the flocculant dosing device 2 and the flocculant dosing pump 3, and turn on the mixing and stirring device 4 to fully mix the wastewater and the flocculant in the mixing tank, wherein the dosing concentration of the flocculant is adjusted according to the actual water sample small-scale preliminary experiment.

[0067] 2) The high turbidity wastewater mixed with the flocculant enters the dissolved air tank 5 from the middle of the mixing tank 1 through the baffle flow channel, and the reflux dissolved air pump 12 and the air flotation air compressor 13 are turned on. Micro bubbles are generated in the lower part of the dissolved air tank through the dissolved air release device 11. Under the action of the bubbles, most of the wastewater enters the reaction tank 6 from the upper end 5 of the dissolved air tank, and some heavier flocs enter the sludge hopper 7 from the lower end of the dissolved air tank 5. During the debugging stage, the water inlet of the reflux dissolved air pump can be replaced with tap water.

[0068] 3) The lighter particles in the wastewater entering the reaction tank 6 float to the water surface under the influence of bubbles to form a scum layer, which is collected into the scum collection tank 10 by the automatic scraping device 9 and then discharged. The heavier flocs settle into the sludge hopper 7 and are discharged through the sludge discharge port. Most of the particles are removed under the action of flotation and sedimentation.

[0069] 4) Clean water with less particles enters the clean water tank 8 from the middle of the reaction tank 6 through the partition channel. At this time, the remaining flocs enter the sludge hopper 7 through the lower part of the clean water tank 8. The wastewater discharged from the upper part of the clean water tank 8 except the reflux used to supply the reflux dissolved air pump is the water produced by the flotation flocculation sedimentation system A.

[0070] 5) The water produced by the flotation flocculation sedimentation system A enters the ultrafiltration raw water tank 15 as the inlet water of the ultrafiltration system B. The wastewater in the ultrafiltration raw water tank 15 enters the ultrafiltration membrane assembly 17 for treatment through the ultrafiltration inlet pump 16.

[0071] 6) The produced water after being treated by the ultrafiltration membrane assembly 17 is sent to the ultrafiltration produced water tank 20 to become the produced water of this process.

[0072] 7) The operation sequence of the ultrafiltration system B is: water intake-air washing-backwashing-air washing, which is repeated. During air washing, the ultrafiltration air compressor 19 is turned on to allow air to enter through the air intake and sewage outlet of the ultrafiltration membrane assembly 17 and be discharged from the cross-flow outlet of the ultrafiltration membrane assembly 17; during backwashing, the water produced in the ultrafiltration water tank 20 is sent to the water outlet of the ultrafiltration membrane assembly 17 through the backwashing pump 18, and the water flows in the reverse direction through the ultrafiltration membrane and is discharged from the air intake and sewage outlet of the ultrafiltration membrane assembly 17 to the mixing tank 1. The water intake-air washing process can be repeated multiple times, and the number of repetitions and the operating time of each link are adjusted according to the actual pressure difference change of the ultrafiltration membrane assembly 17.

[0073] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A membrane process system for treating high turbidity wastewater, characterized in that: Including flotation flocculation sedimentation system and ultrafiltration system, The air flotation flocculation sedimentation system comprises a mixing tank (1), a flocculant dosing device (2), a flocculant dosing pump (3), a mixing and stirring device (4), an air dissolving tank (5), a reaction tank (6), a sludge hopper (7), a clear water tank (8), an automatic scraping device (9), a floating slag collection tank (10), an air dissolving release device (11), a reflux air dissolving pump (12), an air flotation air compressor (13) and an air dissolving tank (14); A tank body is divided into the mixing tank (1), the air dissolving tank (5), the reaction tank (6) and the clean water tank (8) in sequence; the mixing tank (1) is connected to the air dissolving tank (5); a baffle is arranged between the mixing tank (1) and the air dissolving tank (5); the air dissolving tank (5) is connected to the reaction tank (6); an inclined plate is arranged between the air dissolving tank (5) and the reaction tank (6); an inclined sludge hopper (7) is arranged at the bottom of the reaction tank (6); the clean water tank (8) is connected to the reaction tank (6); a baffle is arranged between the clean water tank (8) and the reaction tank (6); and the scum collecting tank (10) is arranged on the upper water surface of the reaction tank (6); The flocculant dosing device (2) is connected to the flocculant dosing pump (3), and the flocculant dosing pump (3) is connected to the mixing tank (1) via a dosing pipeline; The mixing and stirring device (4) is arranged in the middle of the upper part of the mixing tank (1); The dissolved gas release device (11) is provided at the lower part of the dissolved gas pool (5); The automatic scraping device (9) is provided on the water surface above the reaction tank (6); The mixing tank (1) is provided with a water inlet at the top, and the clean water tank (8) is provided with a water outlet at the top; the lower end of the mixing tank (1) and the lower end of the sludge hopper (7) are both provided with sludge discharge ports; The water inlet of the reflux air dissolving pump (12) is connected to the upper water outlet of the clean water tank (8) through a pipeline, the water outlet of the reflux air dissolving pump (12) is connected to the water inlet of the air dissolving tank (14), the air outlet of the air flotation air compressor (13) is connected to the air inlet of the air dissolving tank (14), and the water outlet of the air dissolving tank (14) is connected to the water inlet of the dissolved air release device (11); The ultrafiltration system comprises an ultrafiltration raw water tank (15), an ultrafiltration water inlet pump (16), an ultrafiltration membrane assembly (17), a backwash pump (18), an ultrafiltration air compressor (19) and an ultrafiltration water production tank (20). The water inlet of the ultrafiltration raw water tank (15) is connected to the water outlet of the clean water tank (8), the water outlet of the ultrafiltration raw water tank (15) is connected to the ultrafiltration water inlet pump (16), and the ultrafiltration water inlet pump (16) is connected to the water inlet of the ultrafiltration membrane assembly (17); The bottom of the ultrafiltration membrane assembly (17) is provided with an air intake and sewage discharge port for air intake and sewage discharge, the air intake and sewage discharge port of the ultrafiltration membrane assembly (17) is connected to the air outlet of the ultrafiltration air compressor (19), the cross-flow port of the ultrafiltration membrane assembly (17) is connected to the water inlet of the ultrafiltration raw water tank (15), and the water production port of the ultrafiltration membrane assembly (17) is connected to the water inlet of the ultrafiltration water production tank (20); The water inlet of the backwash pump (18) is connected to the water outlet of the ultrafiltration water production tank (20), the water outlet of the backwash pump (18) is connected to the water production port of the ultrafiltration membrane assembly (17), and the air inlet and sewage outlet of the ultrafiltration membrane assembly (17) is connected to the mixing tank (1) through a pipeline.

2. A membrane process system for treating high turbidity wastewater according to claim 1, characterized in that: The membrane filament (201) of the ultrafiltration membrane assembly (17) is made of PTFE hollow fiber membrane, and the membrane filament (201) inside is arranged in a U shape, and the U-shaped port is located at the upper part of the membrane shell and is sealed. The bottom of the ultrafiltration membrane assembly (17) is provided with an ultrafiltration membrane assembly air inlet and sewage outlet (205), the lower part of the ultrafiltration membrane assembly (17) is provided with an ultrafiltration membrane assembly water inlet (202), the upper part of the ultrafiltration membrane assembly (17) is provided with an ultrafiltration membrane assembly cross-flow port (203), and the top of the ultrafiltration membrane assembly (17) is provided with an ultrafiltration membrane assembly water outlet (204).

3. A membrane process system for treating high turbidity wastewater according to claim 1, characterized in that: A first valve (211) is provided at the water inlet of the mixing tank (1), a second valve (212) is provided at the water outlet of the clean water tank (8), a third valve (213) is provided at the connection between the air flotation compressor (13) and the air dissolving tank (14), a fourth valve (214) is provided at the connection between the air dissolving tank (14) and the air dissolving release device (11), and a thirteenth valve (113) is provided between the water outlet of the reflux air dissolving pump (12) and the air dissolving tank (14).

4. A membrane process system for treating high turbidity wastewater according to claim 1, characterized in that: The mud discharge port of the mixing tank (1) is provided with a fifth valve (215), and the mud discharge port of the sludge hopper (7) is provided with a sixth valve (216).

5. A membrane process system for treating high turbidity wastewater according to claim 1, characterized in that: A seventh valve (217) is arranged between the ultrafiltration water inlet pump (16) and the water inlet of the ultrafiltration membrane assembly (17), an eighth valve (218) is arranged between the water outlet of the ultrafiltration membrane assembly (17) and the ultrafiltration water production tank (20), and a ninth valve (219) is arranged between the cross-flow outlet of the ultrafiltration membrane assembly (17) and the ultrafiltration raw water tank (15).

6. A membrane process system for treating high turbidity wastewater according to claim 1, characterized in that: A tenth valve (110) is provided between the water outlet of the backwash pump (18) and the water outlet of the ultrafiltration membrane assembly (17), an eleventh valve (111) is provided between the air outlet of the ultrafiltration air compressor (19) and the air inlet and sewage outlet of the ultrafiltration membrane assembly (17), and a twelfth valve (112) is provided between the air inlet and sewage outlet of the ultrafiltration membrane assembly (17) and the mixing tank (1).

7. A membrane process system for treating high turbidity wastewater according to claim 1, characterized in that: A first flow meter (221) is provided at the water inlet of the mixing tank (1), a second flow meter (222) is provided at the water outlet of the clean water tank (8), a third flow meter (223) is provided at the water outlet of the reflux dissolved air pump (12), a fourth flow meter (224) is provided at the air outlet of the air flotation air compressor (13), a fifth flow meter (225) is provided at the water outlet of the dissolved air tank (14), a sixth flow meter (226) is provided at the cross-flow outlet of the ultrafiltration membrane assembly (17), and a seventh flow meter (227) is provided at the water outlet of the ultrafiltration membrane assembly (17). An eighth flow meter (228) is provided at the water outlet of the backwash pump (18), a ninth flow meter (229) is provided at the air outlet of the ultrafiltration air compressor (19), and the first flow meter (221), the second flow meter (222), the third flow meter (223), the fourth flow meter (224), the fifth flow meter (225), the sixth flow meter (226), the seventh flow meter (227), the eighth flow meter (228) and the ninth flow meter (229) are used to detect the flow of each system link.

8. The membrane process system for treating high turbidity wastewater according to claim 1, characterized in that: The water inlet of the gas dissolving tank (14) is provided with a first pressure gauge (231), the air inlet of the gas dissolving tank (14) is provided with a second pressure gauge (232), the water outlet of the gas dissolving tank (14) is provided with a third pressure gauge (233), the water inlet of the ultrafiltration membrane assembly (17) is provided with a fourth pressure gauge (234), the water outlet of the ultrafiltration membrane assembly (17) is provided with a fifth pressure gauge (235), the water outlet of the backwash pump (18) is provided with a sixth pressure gauge (236), and the air inlet and sewage outlet of the ultrafiltration membrane assembly (17) is provided with a seventh pressure gauge (237).

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