Integrated water treatment device based on online coagulation coupling cascade membrane filtration

Abstract

The utility model provides an integrated water treatment device based on online coagulation coupling cascade membrane filtration. The integrated water treatment device comprises an online coagulant feeding system, a cascade membrane filtration system, a backwashing system and an online monitoring system. The cascade membrane filtration system comprises a microfiltration membrane module, an ultrafiltration membrane module, a nanofiltration membrane module, a system water inlet pipeline and a final water outlet pipeline. The online coagulant adding system is arranged at a system water inlet pipeline of the cascade membrane filtration system and is connected with the cascade membrane filtration system through a pipeline, the online monitoring system is arranged at a final water outlet pipeline of the cascade membrane filtration system, and the backwashing system is connected with the cascade membrane filtration system through a pipeline. According to the utility model, on the premise of meeting the water quality purification requirement of drinking water, the water treatment process flow is greatly reduced, and the system has the advantages of strong load capacity, stable operation process, small occupied area and the like, and the initial investment and operation cost of the system are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drinking water purification and treatment, and in particular to an integrated water treatment device based on online coagulation coupled cascade membrane filtration. Background Art

[0002] Regarding drinking water treatment, the traditional water treatment processes currently used by many water plants still have common defects such as high energy consumption, large equipment footprint, high operation and maintenance costs, unstable treatment effects, and limited ability to treat specific pollutants, which affect water supply security and increase the economic cost of water treatment. Therefore, we need to seek a more efficient, energy-saving, and stable drinking water treatment process technology.

[0003] Membrane treatment technology is a process that uses a special semi-permeable membrane to separate impurities, microorganisms and soluble solids from water. It includes different types of membrane filtration technologies such as microfiltration, ultrafiltration, nanofiltration and reverse osmosis, and is widely used in water treatment, wastewater treatment, seawater desalination and other fields. It has the advantages of high efficiency, energy saving and small footprint, and is one of the important technical means of modern drinking water treatment. Among them, the pore size of microfiltration membrane is generally between 0.1 microns and 10 microns. During the microfiltration process, large particles such as suspended solids, bacteria and some viruses in the water are retained on the membrane surface, while soluble substances and water can pass through the membrane pores; the pore size of ultrafiltration membrane is generally between 0.005 microns and 0.1 microns. During the ultrafiltration process, colloids, large molecular organic matter, bacteria, viruses and other tiny particles in the water will be retained on the membrane surface, while water and small molecules can pass through the membrane pores; the pore size of nanofiltration membrane is generally between 0.001 microns and 0.01 microns. During the nanofiltration process, the membrane can effectively retain tiny particles such as soluble salts, organic matter, heavy metal ions in the water, while allowing water molecules to pass through. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes an integrated water treatment device based on online coagulation coupled with cascade membrane filtration. The water treatment device comprises: an online coagulant dosing system and a cascade membrane filtration system.

[0005] Wherein, the cascade membrane filtration system comprises: a microfiltration membrane module, an ultrafiltration membrane module, a nanofiltration membrane module, a system water inlet pipeline and a final water outlet pipeline.

[0006] A liquid transport connection is established between the microfiltration membrane module, the ultrafiltration membrane module and the nanofiltration membrane module via a filter tank connecting pipeline; the liquid inlet end of the microfiltration membrane module is connected to the system water inlet pipeline, and the liquid outlet end of the microfiltration membrane module is connected to the liquid inlet end of the ultrafiltration membrane module via the filter tank connecting pipeline; the liquid outlet end of the ultrafiltration membrane module is connected to the liquid inlet end of the nanofiltration membrane module via the filter tank connecting pipeline; the liquid outlet end of the nanofiltration membrane module is connected to the final water outlet pipeline.

[0007] The online coagulant dosing system is arranged at the system water inlet pipeline of the cascade membrane filtration system and is connected to the cascade membrane filtration system through a pipeline.

[0008] In one embodiment, the online coagulant dosing system further comprises a coagulant tank and a metering dosing pump connected to the coagulant tank via a pipeline. The metering dosing pump is also connected to the water inlet pipeline of the system via a pipeline.

[0009] In one embodiment, the microfiltration membrane module further includes: a microfiltration water inlet pipeline, a microfiltration water outlet pipeline, a microfiltration membrane assembly, and a microfiltration membrane pool. A boost pump is provided on the system water inlet pipeline.

[0010] The microfiltration membrane assembly is arranged in a microfiltration membrane pool. The microfiltration membrane assembly adopts an external pressure hollow fiber membrane, made of PVDF, with a membrane pore size of 0.20um and a membrane flux of 500-1000L / (m 2 h), the operation mode is full filtering.

[0011] The microfiltration membrane pool is connected to the system water inlet pipeline through the microfiltration water inlet pipeline; the microfiltration water outlet pipeline is connected to the liquid outlet above the microfiltration membrane pool.

[0012] In one embodiment, the microfiltration membrane module further includes: a microfiltration water inlet pressure gauge and a microfiltration water outlet pressure gauge.

[0013] The microfiltration water inlet pressure gauge is arranged on the microfiltration water inlet pipeline, and the microfiltration water outlet pressure gauge is arranged on the microfiltration water outlet pipeline.

[0014] In one embodiment, the ultrafiltration membrane module further includes: an ultrafiltration water inlet pipeline, an ultrafiltration water outlet pipeline, an ultrafiltration membrane pool, and an ultrafiltration membrane assembly.

[0015] The ultrafiltration membrane assembly is arranged in an ultrafiltration membrane pool; the ultrafiltration membrane assembly adopts an external pressure hollow fiber membrane, the material is PVDF, the membrane pore size is 0.05um, and the membrane flux is 40-100L / (m 2 h), the operation mode is full filtering;

[0016] The ultrafiltration membrane pool is connected to the microfiltration membrane module through the ultrafiltration water inlet pipeline to receive the filtrate treated by the microfiltration membrane module; the ultrafiltration water inlet pipeline is connected to the liquid inlet below the ultrafiltration membrane pool; the ultrafiltration water outlet pipeline is connected to the liquid outlet above the ultrafiltration membrane pool.

[0017] In one embodiment, the ultrafiltration membrane module further includes: an ultrafiltration water inlet pressure gauge and an ultrafiltration water outlet pressure gauge.

[0018] The ultrafiltration water inlet pressure gauge is arranged on the ultrafiltration water inlet pipeline, and the ultrafiltration water outlet pressure gauge is arranged on the ultrafiltration water outlet pipeline.

[0019] In one embodiment, the water treatment device also includes a backwash system, which is connected to the step membrane filtration system through a pipeline; the backwash system includes: an aeration module, a water backwash module, an aeration pipeline, a water backwash pipeline, a backwash upper discharge pipeline, a backwash lower discharge pipeline, and an ultrafiltration water tank.

[0020] The liquid inlet of the ultrafiltration water tank is connected to the liquid outlet of the ultrafiltration membrane module through a pipeline to receive the ultrafiltration treated liquid after ultrafiltration treatment; the liquid outlet of the ultrafiltration water tank is connected to the liquid inlet of the nanofiltration membrane module through the filter tank connecting pipeline.

[0021] The ultrafiltration membrane module also includes an ultrafiltration water tank to receive the filtrate after filtering through the ultrafiltration membrane assembly, and the liquid outlet of the ultrafiltration water tank is connected to the liquid inlet of the nanofiltration membrane module through the filter tank connecting pipeline.

[0022] The aeration module is connected to the microfiltration membrane module and the ultrafiltration membrane module respectively through an aeration pipeline; the backwash upper discharge pipeline connects the upper waste outlets of the microfiltration membrane module and the ultrafiltration membrane module to the outside in a controllable manner.

[0023] The water backwash module is connected to the microfiltration membrane module and the ultrafiltration membrane module through the water backwash pipeline, and the water backwash pipeline is also connected to the ultrafiltration water tank; the backwash lower discharge pipeline respectively connects the lower waste outlets of the microfiltration membrane module and the ultrafiltration membrane module to the outside in a controllable manner.

[0024] In one embodiment, the nanofiltration membrane module further includes: a booster pump, a nanofiltration membrane pool, a first-stage nanofiltration membrane assembly, a second-stage nanofiltration membrane assembly, a nanofiltration water inlet pipeline, and a nanofiltration assembly connecting pipeline.

[0025] The first stage nanofiltration membrane assembly also includes: a first stage nanofiltration membrane assembly No. 1 and a first stage nanofiltration membrane assembly No. 2; the second stage nanofiltration membrane assembly also includes: a second stage nanofiltration membrane assembly No. 1 and a second stage nanofiltration membrane assembly No. 2; the nanofiltration membrane assemblies all use a rolled nanofiltration membrane made of polyamide, with a membrane pore size of 1nm and a membrane flux of 20 to 40L / (m 2h), the operation mode is cross-flow filtration.

[0026] The nanofiltration water inlet pipeline establishes a liquid transport connection with the filter tank connection pipeline, receives ultrafiltration water filtered by the ultrafiltration membrane module, and is respectively connected to the liquid inlet ends of the first stage nanofiltration membrane assembly No. 1 and the first stage nanofiltration membrane assembly No. 2. The booster pump is arranged on the nanofiltration water inlet pipeline.

[0027] The discharge pipeline of a first section of nanofiltration membrane assembly No. 1 is connected to the liquid outlet end of a first section of nanofiltration membrane assembly No. 1, and the discharge pipeline of a first section of nanofiltration membrane assembly No. 2 is connected to the liquid outlet end of a first section of nanofiltration membrane assembly No. 2; the discharge pipeline of a first section of nanofiltration membrane assembly No. 1 and the discharge pipeline of a first section of nanofiltration membrane assembly No. 2 are connected together to a first section of nanofiltration effluent pipeline and the liquid inlet end of the nanofiltration assembly connecting pipeline; the liquid outlet end of the nanofiltration assembly connecting pipeline establishes an infusion connection with the liquid inlet end of the second section of nanofiltration membrane assembly No. 1 and the second section of nanofiltration membrane assembly No. 2 respectively.

[0028] The discharge pipeline of the second-stage nanofiltration membrane assembly No. 1 is connected to the liquid outlet end of the second-stage nanofiltration membrane assembly No. 1, and the discharge pipeline of the second-stage nanofiltration membrane assembly No. 2 is connected to the liquid outlet end of the second-stage nanofiltration membrane assembly No. 2; the discharge pipeline of the second-stage nanofiltration membrane assembly No. 1 and the discharge pipeline of the second-stage nanofiltration membrane assembly No. 2 are connected to the liquid inlet end of the second-stage nanofiltration effluent pipeline and the concentrated water discharge pipeline.

[0029] The first stage nanofiltration water outlet pipeline and the second stage nanofiltration water outlet pipeline are connected to the final water outlet pipeline to transport the final produced water to the outside.

[0030] In one embodiment, the nanofiltration membrane module further includes: a nanofiltration inlet pressure gauge, a first-stage nanofiltration outlet pressure gauge, a second-stage nanofiltration inlet pressure gauge, a second-stage nanofiltration outlet pressure gauge, and a concentrated water pressure gauge.

[0031] The nanofiltration inlet water pressure gauge is arranged on the nanofiltration inlet water pipeline; the first-stage nanofiltration outlet water pressure gauge is arranged on the first-stage nanofiltration outlet water pipeline; the second-stage nanofiltration outlet water pressure gauge is arranged on the second-stage nanofiltration outlet water pipeline; the concentrate water pressure gauge is arranged on the concentrate water discharge pipeline; and the second-stage nanofiltration inlet water pressure gauge is arranged on the nanofiltration component connecting pipeline.

[0032] In one embodiment, the water treatment device also includes an online monitoring system, which is arranged at the final water outlet pipeline of the cascade membrane filtration system; the online monitoring system includes: an online turbidity monitor, an online colorimetry monitor, an online potassium permanganate monitor, an online ammonia nitrogen monitor, an online temperature monitor and an online pH monitor.

[0033] The implementation of the present invention can at least produce the following beneficial technical effects:

[0034] The utility model adopts online coagulation to replace the traditional coagulation, flocculation and sedimentation units. On the premise of meeting the requirements for drinking water quality purification, the water treatment process is greatly reduced, the flocculation tank and the sedimentation tank are saved, and the floor space is significantly reduced; the microfiltration membrane filtration treatment is adopted as the pre-treatment process of the ultrafiltration membrane filtration treatment, which can effectively intercept the suspended solids, bacteria and part of the virus and other large particles in the water in the microfiltration membrane module, which can significantly reduce the membrane pollution of the subsequent ultrafiltration membrane module, and can effectively improve the water production flux of the ultrafiltration membrane and extend its service life, thereby reducing the operating energy consumption of the system; the ultrafiltration membrane system is adopted as the pre-treatment process of the nanofiltration membrane module, which can effectively intercept the colloid, macromolecular organic matter, bacteria, viruses and other small particles in the water in the ultrafiltration membrane module, which can significantly reduce the membrane pollution of the subsequent nanofiltration membrane, and can effectively improve the water production flux of the nanofiltration membrane module and extend its service life, thereby reducing the operating energy consumption of the system; finally, the soluble salts, organic matter, heavy metal ions and the like in the water are intercepted by the nanofiltration membrane module, so as to realize the preparation of high-quality drinking water. The final effluent of the utility model can achieve a turbidity removal rate of >99%, a chromaticity removal rate of >95%, a permanganate index removal rate of >80% and an ammonia nitrogen removal rate of >95%. Under the premise of meeting the requirements for drinking water quality purification, the water treatment process is greatly reduced, and it has the advantages of strong impact load resistance, high operation process stability and small footprint, which greatly reduces the initial investment and operation cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0036] Figure 1 It is a brief schematic diagram of the framework of an integrated water treatment device based on online coagulation coupled with cascade membrane filtration provided in an embodiment of the present application;

[0037] Figure 2 It is a structural schematic diagram of an integrated water treatment device based on online coagulation coupled cascade membrane filtration provided according to an embodiment of the present application.

[0038] Reference numerals:

[0039] 1-coagulant tank; 2-dosing pump; 3-lifting pump; 4-microfiltration inlet pipe; 5-microfiltration inlet pressure gauge; 6-microfiltration membrane assembly; 7-microfiltration outlet pipe; 8-microfiltration outlet pressure gauge; 9-aeration pipe; 10-aeration pipe at microfiltration membrane module; 11-partial water backwash pipe at microfiltration membrane module; 12-upper backwash pipe at microfiltration membrane module; 13-lower backwash pipe at microfiltration membrane module; 14-air aeration module ; 15-water backwash module; 16-ultrafiltration water inlet pipeline; 17-ultrafiltration water inlet pressure gauge; 18-ultrafiltration membrane assembly; 19-ultrafiltration water outlet pipeline; 20-ultrafiltration water outlet pressure gauge; 21-ultrafiltration water tank; 22-aeration pipeline at the ultrafiltration membrane module; 23-partial water backwash pipeline at the ultrafiltration membrane module; 24-upper backwash pipeline at the ultrafiltration membrane module; 25-lower backwash pipeline at the ultrafiltration membrane module; 26-boosting pump; 27-nanofiltration water inlet pipe 28-nanofiltration inlet pressure gauge; 29-first stage nanofiltration module No. 1; 30-first stage nanofiltration membrane module No. 2; 31-first stage nanofiltration outlet pipeline; 32-first stage nanofiltration outlet pressure gauge; 33-nanofiltration module connecting pipeline; 34-second stage nanofiltration inlet pressure gauge; 35-second stage nanofiltration membrane module No. 1; 36-second stage nanofiltration membrane module No. 2; 37-second stage nanofiltration outlet pipeline; 38-second stage nanofiltration outlet pressure gauge; 39-concentrated water discharge pipeline; 40- Concentrated water pressure gauge; 41-discharge pipeline No. 1 of first-stage nanofiltration membrane assembly; 42-discharge pipeline No. 2 of first-stage nanofiltration membrane assembly; 43-discharge pipeline No. 1 of second-stage nanofiltration membrane assembly; 44, discharge pipeline No. 2 of second-stage nanofiltration membrane assembly; 45-final effluent pipeline; 46-online turbidity monitor; 47-online colorimetry monitor; 48-online permanganate monitor; 49-online ammonia nitrogen monitor; 50-online temperature monitor; 51, online pH monitor. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs. Although any methods and materials similar or equivalent to those described herein can also be used in the practice or testing of the present disclosure, exemplary methods and materials are now described.

[0042] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0043] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various parts under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, the descriptions of "one section", "two sections", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "one section" or "two sections" may explicitly or implicitly include at least one of the said features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0046] like Figure 1-2 As shown, the utility model discloses an integrated water treatment device based on online coagulation coupled with cascade membrane filtration, and the device mainly comprises: an online coagulant dosing system and a cascade membrane filtration system.

[0047] The cascade membrane filtration system mainly includes: a microfiltration membrane module, an ultrafiltration membrane module, a nanofiltration membrane module, a system water inlet pipeline and a final water outlet pipeline.

[0048] Among them, the microfiltration membrane module, the ultrafiltration membrane module and the nanofiltration membrane module are connected to each other through the filter tank connecting pipeline. The liquid inlet end of the microfiltration membrane module is connected to the water inlet pipeline of the system, and the liquid outlet end of the microfiltration membrane module is connected to the liquid inlet end of the ultrafiltration membrane module through the filter tank connecting pipeline; the liquid outlet end of the ultrafiltration membrane module is connected to the liquid inlet end of the nanofiltration membrane module through the filter tank connecting pipeline; the liquid outlet end of the nanofiltration membrane module is connected to the final water outlet pipeline 45.

[0049] Specifically, the microfiltration membrane module includes: a microfiltration water inlet pipeline 4, a microfiltration water outlet pipeline 7, a microfiltration membrane assembly 6, and a microfiltration membrane pool. The microfiltration membrane assembly 6 is arranged in the microfiltration membrane pool, and the microfiltration membrane pool is connected to the system water inlet pipeline through the microfiltration water inlet pipeline 4; the microfiltration water outlet pipeline 7 is connected to the liquid outlet above the microfiltration membrane pool. A lifting pump 3 is also arranged on the system water inlet pipeline. The microfiltration membrane module lifts the untreated water mixed with the coagulant through the microfiltration water inlet pipeline 4 to the microfiltration membrane assembly 6 through the lifting pump 3. The untreated water will intercept the suspended solids, bacteria and some large particles such as viruses in the water through the microfiltration membrane assembly 6, and the produced water that can pass through the microfiltration membrane assembly 6 will flow to the next treatment process through the microfiltration water outlet pipeline 7.

[0050] Preferably, the microfiltration membrane assembly 6 can be an external pressure hollow fiber membrane, the material can be set to PVDF, the membrane pore size is set to 0.20um, and the membrane flux is set to 500-1000L / (m 2 h), set the operation mode to full filtering.

[0051] Furthermore, the microfiltration membrane module further comprises: a microfiltration inlet pressure gauge and a microfiltration outlet pressure gauge. The microfiltration inlet pressure gauge 5 is arranged on the microfiltration inlet pipeline 4, and the microfiltration outlet pressure gauge 8 is arranged on the microfiltration outlet pipeline 7, for measuring the inlet pressure and outlet pressure of the microfiltration membrane module.

[0052] Specifically, the ultrafiltration membrane module also includes: an ultrafiltration water inlet pipeline, an ultrafiltration water outlet pipeline, an ultrafiltration membrane pool, and an ultrafiltration membrane assembly. The ultrafiltration membrane assembly 18 is arranged in the ultrafiltration membrane pool, and the ultrafiltration membrane pool is connected to the microfiltration membrane module through the ultrafiltration water inlet pipeline 16 to receive the filtrate treated by the microfiltration membrane module. The ultrafiltration water inlet pipeline 16 is connected to the lower liquid inlet of the ultrafiltration membrane pool, and the ultrafiltration water outlet pipeline 19 is connected to the upper liquid outlet of the ultrafiltration membrane pool. The ultrafiltration membrane module also includes an ultrafiltration water tank 21, and the liquid outlet end of the ultrafiltration water tank is connected to the liquid inlet end of the nanofiltration membrane module through the filter pool connecting pipeline. The ultrafiltration membrane assembly 18 can intercept tiny particles such as colloids, macromolecular organic matter, bacteria, etc. in water, and the water produced by the ultrafiltration membrane assembly 18 will flow to the ultrafiltration water tank 21 through the ultrafiltration water outlet pipeline 19 for water storage.

[0053] Preferably, the ultrafiltration membrane assembly 18 can be an external pressure hollow fiber membrane, the material can be set to PVDF, the membrane pore size is set to 0.05um, and the membrane flux is set to 40-100L / (m 2 h), set the operation mode to full filtering.

[0054] Furthermore, the ultrafiltration membrane module further comprises: an ultrafiltration water inlet pressure gauge 17 and an ultrafiltration water outlet pressure gauge 20. The ultrafiltration water inlet pressure gauge 17 is arranged on the ultrafiltration water inlet pipeline 16, and the ultrafiltration water outlet pressure gauge 20 is arranged on the ultrafiltration water outlet pipeline, for measuring the water inlet pressure and water outlet pressure of the ultrafiltration membrane module.

[0055] Combination Figure 2 Specifically, the nanofiltration membrane module also includes: a booster pump, a nanofiltration membrane pool, a first-stage nanofiltration membrane assembly, a second-stage nanofiltration membrane assembly, a nanofiltration water inlet pipeline, and a nanofiltration assembly connecting pipeline.

[0056] Specifically, the first stage nanofiltration membrane assembly further includes: a first stage nanofiltration membrane assembly No. 1 and a first stage nanofiltration membrane assembly No. 2. The second stage nanofiltration membrane assembly further includes: a second stage nanofiltration membrane assembly No. 1 and a second stage nanofiltration membrane assembly No. 2.

[0057] The nanofiltration water inlet pipeline 27 establishes a liquid transport connection with the filter tank connection pipeline, receives the ultrafiltration water filtered by the ultrafiltration membrane module, and is respectively connected to the liquid inlet ends of the first stage nanofiltration membrane assembly No. 1 and the first stage nanofiltration membrane assembly No. 2. At the same time, a booster pump 26 can be provided on the nanofiltration water inlet pipeline 27 to boost the raw liquid to be treated by nanofiltration.

[0058] The discharge pipeline of the first stage nanofiltration membrane assembly No. 1 is connected to the liquid outlet end of the first stage nanofiltration membrane assembly No. 1, and the discharge pipeline of the first stage nanofiltration membrane assembly No. 2 is connected to the liquid outlet end of the first stage nanofiltration membrane assembly No. 2. The discharge pipeline of the first stage nanofiltration membrane assembly No. 1 and the discharge pipeline of the first stage nanofiltration membrane assembly No. 2 are connected to the liquid inlet end of the first stage nanofiltration water outlet pipeline 31 and the nanofiltration assembly connecting pipeline 33. The liquid outlet end of the nanofiltration assembly connecting pipeline 33 establishes a liquid infusion connection with the liquid inlet end of the second stage nanofiltration membrane assembly No. 1 and the second stage nanofiltration membrane assembly No. 2, respectively.

[0059] The discharge pipeline of the second-stage nanofiltration membrane assembly No. 1 is connected to the liquid outlet of the second-stage nanofiltration membrane assembly No. 1, and the discharge pipeline of the second-stage nanofiltration membrane assembly No. 2 is connected to the liquid outlet of the second-stage nanofiltration membrane assembly No. 2. The discharge pipeline of the second-stage nanofiltration membrane assembly No. 1 and the discharge pipeline of the second-stage nanofiltration membrane assembly No. 2 are connected to the liquid inlet of the second-stage nanofiltration effluent pipeline 37 and the concentrated water discharge pipeline 39.

[0060] The first stage nanofiltration outlet pipe 31 and the second stage nanofiltration outlet pipe 37 are connected to the final outlet pipe 45 to transport the final produced water to the outside. In this embodiment, the soluble salts, organic substances, heavy metal ions, etc. in the water are intercepted by the nanofiltration membrane assembly. The produced water that can pass through the first stage nanofiltration membrane assembly will flow into the final outlet pipe 45 through the first stage nanofiltration membrane outlet pipe to flow out to the outside, while the wastewater that cannot pass through the first stage nanofiltration membrane assembly will flow through the nanofiltration assembly connecting pipe 33 to the second stage nanofiltration membrane assembly for secondary filtration. The produced water that can pass through the second stage nanofiltration membrane assembly will flow into the final outlet pipe 45 through the second stage nanofiltration outlet pipe 37 to flow out to the outside, while the wastewater that cannot pass through the second stage nanofiltration membrane assembly will flow out as the final concentrated water through the concentrated water discharge pipe 39.

[0061] Preferably, the nanofiltration membrane components all use rolled nanofiltration membranes made of polyamide, with a pore size of 1 nm and a membrane flux of 20 to 40 L / (m 2 h), the operation mode is cross-flow filtration.

[0062] Furthermore, the nanofiltration membrane module also includes: a nanofiltration inlet pressure gauge, a first-stage nanofiltration outlet pressure gauge, a second-stage nanofiltration inlet pressure gauge, a second-stage nanofiltration outlet pressure gauge, and a concentrated water pressure gauge. The nanofiltration inlet pressure gauge 28 is arranged on the nanofiltration inlet pipeline 27, the first-stage nanofiltration outlet pressure gauge 32 is arranged on the first-stage nanofiltration outlet pipeline 31, the second-stage nanofiltration outlet pressure gauge 38 is arranged on the second-stage nanofiltration outlet pipeline 37, the concentrated water pressure gauge 40 is arranged on the concentrated water discharge pipeline 39, and the second-stage nanofiltration inlet pressure gauge is arranged on the nanofiltration component connecting pipeline 33. Through the above method, comprehensive liquid pressure monitoring can be performed on each liquid flow node of the nanofiltration membrane module.

[0063] Furthermore, the water treatment device also includes a backwashing system, which is connected to the cascade membrane filtration system through a pipeline. The backwashing system includes: an aeration module, a water backwashing module, an aeration pipeline, a water backwashing pipeline, a backwashing upper discharge pipeline, a backwashing lower discharge pipeline, and an ultrafiltration water tank. The liquid inlet end of the ultrafiltration water tank is connected to the liquid outlet end of the ultrafiltration membrane module through a pipeline to receive the ultrafiltration treated liquid after ultrafiltration treatment. The liquid outlet end of the ultrafiltration water tank is connected to the liquid inlet end of the nanofiltration membrane module through the filter tank connecting pipeline. The aeration module 14 is connected to the microfiltration membrane module and the ultrafiltration membrane module respectively through the aeration pipeline 9. The backwashing upper discharge pipeline connects the upper waste outlets of the microfiltration membrane module and the ultrafiltration membrane module to the outside world in a controllable manner. The water backwashing module 15 is connected to the microfiltration membrane module and the ultrafiltration membrane module through the water backwashing pipeline, and the water backwashing pipeline is also connected to the ultrafiltration water tank 21. The backwash lower discharge pipeline respectively connects the lower waste outlets of the microfiltration membrane module and the ultrafiltration membrane module to the outside in a controllable manner.

[0064] Specifically, combined Figure 2 When the aeration module 14 performs air flushing, the aeration pipeline 9 conveys the gas generated by the aeration module 14 to perform gas flushing on the microfiltration membrane module and the ultrafiltration membrane module, and discharges the flushed waste gas from the backwash upper discharge pipeline to the outside. When the aeration module 14 performs upper water backwashing, the water backwashing module 15 draws water from the ultrafiltration water tank 21, flushes the microfiltration membrane assembly 6 and the ultrafiltration membrane assembly 18 through the water backwashing pipeline, and discharges the flushing waste water from the backwash upper discharge pipeline. When the aeration module 14 performs lower water backwashing, the water backwashing module 15 draws water from the ultrafiltration water tank 21, flushes the microfiltration membrane assembly 6 and the ultrafiltration membrane assembly 18 through the water backwashing pipeline, and discharges the flushing waste water from the backwash lower discharge pipeline. When the aeration module 14 is positively flushed, the lift pump 3 flushes the microfiltration membrane module with the water to be treated through the system water inlet pipeline, flushes the ultrafiltration membrane module through the filter tank pipeline, and discharges the flushing wastewater from the backwash upper discharge pipeline located above the ultrafiltration membrane module. In this embodiment, the specific steps of the backwash method are: air flushing for 30 to 60 seconds, upper backwashing for 30 to 60 seconds, lower backwashing for 30 to 60 seconds, and positive flushing for 30 to 60 seconds. The implementation cycle of backwashing is 60 to 180 minutes.

[0065] Specific, combined Figure 2 , the online coagulant dosing system also includes: a coagulant agent box 1 and a metering dosing pump 2 connected to the coagulant agent box 1 through a pipeline, and the metering dosing pump 2 is connected to the system water inlet pipeline through a pipeline. The online coagulant dosing system is arranged at the system water inlet pipeline of the cascade membrane filtration system and is connected to the cascade membrane filtration system through a pipeline. The online coagulant dosing system can add coagulant to the microfiltration membrane water inlet pipeline system through the metering dosing pump 2 to fully mix with the water to be treated, so that the particulate matter, colloid and macromolecular organic matter in the water are destabilized.

[0066] Preferably, the type of coagulant added can be set to one or more of polyaluminium chloride, polyferric sulfate, aluminium sulfate, ferric chloride or other coagulants and coagulant aids that can be used for drinking water production, and the coagulant dosage is set to 5-30 mg / L.

[0067] Further, combined with Figure 2The water treatment device also includes an online monitoring system, which is arranged at the final water outlet pipeline of the cascade membrane filtration system. The online monitoring system is arranged at the final water outlet pipeline of the cascade membrane filtration system. Specifically, the online monitoring system includes: an online turbidity monitor 46, an online chromaticity monitor 47, an online permanganate monitor, an online ammonia nitrogen monitor 49, an online temperature monitor 50 and an online pH monitor 51, which are used to monitor the turbidity, chromaticity, permanganate index, ammonia nitrogen, temperature and pH value in the final water outlet of the equipment in real time.

[0068] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. An integrated water treatment device based on online coagulation coupled with cascade membrane filtration, characterized in that: Including online coagulant dosing system and cascade membrane filtration system; The cascade membrane filtration system comprises: a microfiltration membrane module, an ultrafiltration membrane module, a nanofiltration membrane module, a system water inlet pipeline and a final water outlet pipeline; A liquid transport connection is established between the microfiltration membrane module, the ultrafiltration membrane module and the nanofiltration membrane module through a filter tank connecting pipeline; the liquid inlet end of the microfiltration membrane module is connected to the water inlet pipeline of the system, and the liquid outlet end of the microfiltration membrane module is connected to the liquid inlet end of the ultrafiltration membrane module through the filter tank connecting pipeline; the liquid outlet end of the ultrafiltration membrane module is connected to the liquid inlet end of the nanofiltration membrane module through the filter tank connecting pipeline; the liquid outlet end of the nanofiltration membrane module is connected to the final water outlet pipeline; The online coagulant dosing system is arranged at the system water inlet pipeline of the cascade membrane filtration system and is connected to the cascade membrane filtration system through a pipeline.

2. The integrated water treatment device based on online coagulation coupled cascade membrane filtration according to claim 1 is characterized in that: The online coagulant dosing system also includes a coagulant agent box and a metering dosing pump connected to the coagulant agent box through a pipeline; the metering dosing pump is connected to the water inlet pipeline of the system through a pipeline.

3. The integrated water treatment device based on online coagulation coupled cascade membrane filtration according to claim 1 is characterized in that: The microfiltration membrane module further includes: a microfiltration water inlet pipeline, a microfiltration water outlet pipeline, a microfiltration membrane assembly, and a microfiltration membrane pool; a lifting pump is arranged on the water inlet pipeline of the system; The microfiltration membrane assembly is arranged in a microfiltration membrane pool; the microfiltration membrane assembly adopts an external pressure hollow fiber membrane, the material is PVDF, the membrane pore size is 0.20um, the membrane flux is 500-1000L / (m2·h), and the operation mode is full-volume filtration; The microfiltration membrane pool is connected to the system water inlet pipeline through the microfiltration water inlet pipeline; the microfiltration water outlet pipeline is connected to the liquid outlet above the microfiltration membrane pool.

4. The integrated water treatment device based on online coagulation coupled cascade membrane filtration according to claim 1 is characterized in that: The ultrafiltration membrane module also includes: an ultrafiltration water inlet pipeline, an ultrafiltration water outlet pipeline, an ultrafiltration membrane pool, and an ultrafiltration membrane assembly; The ultrafiltration membrane assembly is arranged in an ultrafiltration membrane pool; the ultrafiltration membrane assembly adopts an external pressure hollow fiber membrane, the material is PVDF, the membrane pore size is 0.05um, the membrane flux is 40-100L / (m2·h), and the operation mode is full-volume filtration; The ultrafiltration membrane pool is connected to the microfiltration membrane module through the ultrafiltration water inlet pipeline to receive the filtrate treated by the microfiltration membrane module; the ultrafiltration water inlet pipeline is connected to the liquid inlet below the ultrafiltration membrane pool; the ultrafiltration water outlet pipeline is connected to the liquid outlet above the ultrafiltration membrane pool.

5. The integrated water treatment device based on online coagulation coupled cascade membrane filtration according to claim 3 is characterized in that: The microfiltration membrane module further includes: a microfiltration water inlet pressure gauge and a microfiltration water outlet pressure gauge; The microfiltration water inlet pressure gauge is arranged on the microfiltration water inlet pipeline, and the microfiltration water outlet pressure gauge is arranged on the microfiltration water outlet pipeline.

6. The integrated water treatment device based on online coagulation coupled cascade membrane filtration according to claim 4 is characterized in that: The ultrafiltration membrane module also includes: an ultrafiltration water inlet pressure gauge and an ultrafiltration water outlet pressure gauge; The ultrafiltration water inlet pressure gauge is arranged on the ultrafiltration water inlet pipeline, and the ultrafiltration water outlet pressure gauge is arranged on the ultrafiltration water outlet pipeline.

7. The integrated water treatment device based on online coagulation coupled cascade membrane filtration according to claim 1 is characterized in that: The water treatment device also includes a backwashing system, which is connected to the cascade membrane filtration system through a pipeline; the backwashing system includes: an air aeration module, a water backwashing module, an aeration pipeline, a water backwashing pipeline, a backwashing upper discharge pipeline, a backwashing lower discharge pipeline, and an ultrafiltration water tank; The liquid inlet of the ultrafiltration water tank is connected to the liquid outlet of the ultrafiltration membrane module through a pipeline to receive the ultrafiltration treated liquid after ultrafiltration treatment; the liquid outlet of the ultrafiltration water tank is connected to the liquid inlet of the nanofiltration membrane module through the filter tank connecting pipeline; The aeration module is connected to the microfiltration membrane module and the ultrafiltration membrane module respectively through an aeration pipeline; the backwash upper discharge pipeline connects the upper waste outlets of the microfiltration membrane module and the ultrafiltration membrane module to the outside in a controllable manner; The water backwash module is connected to the microfiltration membrane module and the ultrafiltration membrane module through the water backwash pipeline, and the water backwash pipeline is also connected to the ultrafiltration water tank; the backwash lower discharge pipeline respectively connects the lower waste outlets of the microfiltration membrane module and the ultrafiltration membrane module to the outside in a controllable manner.

8. The integrated water treatment device based on online coagulation coupled cascade membrane filtration according to claim 1 is characterized in that: The nanofiltration membrane module also includes: a booster pump, a nanofiltration membrane pool, a first-stage nanofiltration membrane assembly, a second-stage nanofiltration membrane assembly, a nanofiltration water inlet pipeline, and a nanofiltration assembly connecting pipeline; The first-stage nanofiltration membrane assembly further includes: a first-stage nanofiltration membrane assembly No. 1 and a first-stage nanofiltration membrane assembly No. 2; the second-stage nanofiltration membrane assembly further includes: a second-stage nanofiltration membrane assembly No. 1 and a second-stage nanofiltration membrane assembly No. 2; the nanofiltration membrane assemblies all use a rolled nanofiltration membrane made of polyamide, with a membrane pore size of 1nm, a membrane flux of 20 to 40L / (m2·h), and an operating mode of cross-flow filtration; The nanofiltration water inlet pipeline establishes a liquid transport connection with the filter tank connecting pipeline, receives the ultrafiltration water filtered by the ultrafiltration membrane module, and is respectively connected to the liquid inlet ends of the first section of the nanofiltration membrane assembly No. 1 and the first section of the nanofiltration membrane assembly No. 2; the booster pump is arranged on the nanofiltration water inlet pipeline; The discharge pipeline of a first-stage nanofiltration membrane assembly No. 1 is connected to the liquid outlet end of a first-stage nanofiltration membrane assembly No. 1, and the discharge pipeline of a first-stage nanofiltration membrane assembly No. 2 is connected to the liquid outlet end of a first-stage nanofiltration membrane assembly No. 2; the discharge pipeline of a first-stage nanofiltration membrane assembly No. 1 and the discharge pipeline of a first-stage nanofiltration membrane assembly No. 2 are connected to a first-stage nanofiltration effluent pipeline and the liquid inlet end of the nanofiltration assembly connecting pipeline; the liquid outlet end of the nanofiltration assembly connecting pipeline is respectively connected to the liquid inlet end of the second-stage nanofiltration membrane assembly No. 1 and the second-stage nanofiltration membrane assembly No. 2 to establish a liquid infusion connection; The discharge pipeline of the second-stage nanofiltration membrane assembly No. 1 is connected to the liquid outlet end of the second-stage nanofiltration membrane assembly No. 1, and the discharge pipeline of the second-stage nanofiltration membrane assembly No. 2 is connected to the liquid outlet end of the second-stage nanofiltration membrane assembly No. 2; the discharge pipeline of the second-stage nanofiltration membrane assembly No. 1 and the discharge pipeline of the second-stage nanofiltration membrane assembly No. 2 are connected to the liquid inlet end of the second-stage nanofiltration effluent pipeline and the concentrated water discharge pipeline; The first stage nanofiltration water outlet pipeline and the second stage nanofiltration water outlet pipeline are connected to the final water outlet pipeline to transport the final produced water to the outside.

9. The integrated water treatment device based on online coagulation coupled cascade membrane filtration according to claim 8, characterized in that: The nanofiltration membrane module further includes: a nanofiltration inlet pressure gauge, a first-stage nanofiltration outlet pressure gauge, a second-stage nanofiltration inlet pressure gauge, a second-stage nanofiltration outlet pressure gauge, and a concentrated water pressure gauge; The nanofiltration inlet water pressure gauge is arranged on the nanofiltration inlet water pipeline; the first-stage nanofiltration outlet water pressure gauge is arranged on the first-stage nanofiltration outlet water pipeline; the second-stage nanofiltration outlet water pressure gauge is arranged on the second-stage nanofiltration outlet water pipeline; the concentrate water pressure gauge is arranged on the concentrate water discharge pipeline; and the second-stage nanofiltration inlet water pressure gauge is arranged on the nanofiltration component connecting pipeline.

10. The integrated water treatment device based on online coagulation coupled cascade membrane filtration according to claim 1, characterized in that: The water treatment device also includes an online monitoring system, which is arranged at the final water outlet pipeline of the cascade membrane filtration system; the online monitoring system includes: an online turbidity monitor, an online chromaticity monitor, an online potassium permanganate monitor, an online ammonia nitrogen monitor, an online temperature monitor and an online pH monitor.

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