CN216737678U

CN216737678U - Advanced treatment device for reclaimed water reuse

Info

Publication number: CN216737678U
Application number: CN202220196640.4U
Authority: CN
Inventors: 李燕利; 刘顺祥; 郭燕; 贺志庆
Original assignee: Shandong Weiqi Environmental Protection Technology Co ltd
Current assignee: Shandong Weiqi Environmental Protection Technology Co ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-06-14
Anticipated expiration: 2032-01-25

Abstract

The utility model discloses a reclaimed water recycling advanced treatment device which mainly comprises a raw water tank, a primary filtering system, an intermediate water tank, a nanofiltration system, a nanofiltration water production tank, a reverse osmosis system and a recycling water tank, wherein the primary filtering system is arranged in the raw water tank; the nanofiltration system mainly comprises a security filter, a high-pressure pump, a first-stage nanofiltration membrane device, a second-stage nanofiltration membrane device, a water production pipe and a concentrated water pipe; the nanofiltration water production tank is connected with the reverse osmosis system through a pipeline, and the produced water of the reverse osmosis system enters the reuse water tank. The device adopts a primary filtration system, a nanofiltration system and a reverse osmosis system, and has the advantages of ensuring higher water yield, realizing the advanced treatment and reutilization of reclaimed water, and being used as a reclaimed water reuse and desalted water pretreatment process of circulating cooling water.

Description

Advanced treatment device for reclaimed water reuse

Technical Field

The utility model particularly relates to a reclaimed water recycling advanced treatment device, and belongs to the technical field of water treatment.

Background

The reclaimed water is also called as reclaimed water, which means that the sewage reaches a certain water quality index after being properly treated, and meets certain use requirements. The treated reclaimed water can be used for various purposes such as urban greening, vehicle cleaning, fire-fighting water, industrial cooling water and the like according to different water qualities.

Compared with the traditional remote water transfer engineering, the reclaimed water recycling technology can provide a stable and sustainable local water source, reduce energy consumption and reduce the demand of sewage treatment plants and some basic water treatment facilities. The reclaimed water recycling treatment technology mainly comprises the following steps: physical and chemical methods such as filtration, adsorption, coagulating sedimentation and other technologies, but the quality of the effluent is not high; biological methods such as an activated sludge method, a biofilm method and the like utilize microorganisms to degrade organic pollutants so as to purify sewage, but have the defects of difficult operation, management and protection, large occupied area and the like; the membrane separation method mainly uses a membrane material having selective permeability, and water passes through the membrane by applying pressure from the outside, and contaminants and salts in the water are retained, such as an ultrafiltration membrane, a reverse osmosis membrane, and the like, but the water yield is not high. With the improvement of the standard of reuse water, the treatment requirements on hardness, alkalinity, bacteria and the like in water are improved, and the limitation of equipment scale, operation cost and professional technology is solved, so that a reuse water advanced treatment system is urgently needed to be designed, so that the reuse water advanced treatment technology can be widely applied, and the severe problem of water resource shortage is solved.

Disclosure of Invention

In order to overcome the technical problems in the prior art, the utility model aims to provide an advanced treatment system and device for reclaimed water recycling, which are simple and reasonable in design, high in water production rate, high in operation stability and high in effluent quality.

The utility model provides a reclaimed water recycling advanced treatment system, which is characterized in that: the device mainly comprises a raw water tank, a primary filtering system, an intermediate water tank, a nanofiltration system, a nanofiltration product water tank, a reverse osmosis system and a reuse water tank; the raw water tank is connected with the primary filtering system through a pipeline, and a raw water pump is arranged on the pipeline; the water outlet of the primary filtering system is connected with the intermediate water tank; the middle water tank is connected with the nanofiltration membrane system through a pipeline, and a low-pressure pump is arranged on the pipeline; the nanofiltration system mainly comprises a security filter, a high-pressure pump, a first-stage nanofiltration membrane device, a second-stage nanofiltration membrane device, a water production pipe and a concentrated water pipe, wherein the concentrated water of the first-stage nanofiltration membrane device is connected with the second-stage nanofiltration membrane device through a pipeline, the pipeline is provided with a booster pump, the produced water of the first-stage nanofiltration membrane device and the second-stage nanofiltration membrane device enters the nanofiltration water production tank through the water production pipe, and the concentrated water of the second-stage nanofiltration membrane device enters the concentrated water pipe; the nanofiltration water production tank is connected with the reverse osmosis system through a pipeline, and the produced water of the reverse osmosis system enters the reuse water tank.

And further, the primary filtering system is a quartz sand filter or a multi-medium filter, the filtering precision is 0.01-5mm, and after the raw water is filtered, the raw water is input into a subsequent membrane filtering device to filter the raw water for the first time so as to remove large-particle pollutants with the particle size of more than or equal to 0.02 mu m in the raw water.

Furthermore, the back part of a concentrated water pipe of the nanofiltration system is provided with two pipelines, the concentrated water pipe No. 1 is directly discharged, the concentrated water pipe No. 2 is connected to the front end of an inlet of the high-pressure pump, the concentrated water flows back, the water yield of the system is improved, and the stop valve is arranged on the concentrated water pipe No. 2 and can adjust the backflow amount.

And a plurality of nanofiltration membrane elements are arranged in the nanofiltration membrane device, are horizontally arranged in parallel and operate in parallel, and are polyamide membranes with the molecular weight cutoff of 200-800 daltons.

Furthermore, the reverse osmosis system can be a primary reverse osmosis device or a secondary reverse osmosis device according to the water demand.

The advanced treatment device and the treatment method for reclaimed water reuse, provided by the utility model, have the beneficial effects that the adopted nanofiltration system replaces the traditional ultrafiltration membrane system, the higher water yield can be ensured, the effluent is better than municipal water supply, the requirement of industrial water is met, the reclaimed water can be reused after advanced treatment, and the reclaimed water can be used as reclaimed water reuse and desalted water pretreatment of circulating cooling water. Due to higher nanofiltration, the effluent quality is high, the service life of a subsequent reverse osmosis membrane can be prolonged, the membrane replacement frequency is reduced, and the maintenance cost is reduced.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure, 1, a raw water tank; 2. a primary filtration system; 3. an intermediate water tank; 4. a nanofiltration water production tank; 5. a reverse osmosis system; 6. a recycling water tank; 7. a raw water pump; 8. a low pressure pump; 9. a cartridge filter; 10 a high pressure pump; 11. a nanofiltration membrane device; 12. a second stage nanofiltration membrane device; 13. a water production pipe; 14. a concentrated water pipe; 15. a booster pump; 16. and a stop valve.

Detailed Description

The following description of the present invention will be made with reference to fig. 1.

As shown in fig. 1, the advanced treatment device for reclaimed water recycling mainly comprises a raw water tank 1, a primary filtration system 2, an intermediate water tank 3, a nanofiltration system, a nanofiltration product water tank 4, a reverse osmosis system 5 and a recycling water tank 6; the raw water tank is connected with the primary filtering system through a pipeline, and a raw water pump 7 is arranged on the pipeline; the water outlet of the primary filtering system 2 is connected with the intermediate water tank 3; the intermediate water tank 3 is connected with the nanofiltration membrane system through a pipeline, and a low-pressure pump 8 is arranged on the pipeline; the nanofiltration system mainly comprises a security filter 9, a high-pressure pump 10, a first-stage nanofiltration membrane device 11, a second-stage nanofiltration membrane device 12, a water production pipe 13 and a concentrated water pipe 14, wherein concentrated water of the first-stage nanofiltration membrane device 11 is connected with water inlet of the second-stage nanofiltration membrane device 12 through a pipeline, the pipeline is provided with a booster pump 15, produced water of the first-stage nanofiltration membrane device 11 and the second-stage nanofiltration membrane device 12 enters a nanofiltration water production tank 4 through the water production pipe 13, and concentrated water of the second-stage nanofiltration membrane device 12 enters the concentrated water pipe 14; the nanofiltration water production tank 4 is connected with the reverse osmosis system 5 through a pipeline, and the produced water of the reverse osmosis system 5 enters the reuse water tank 6.

Raw water is firstly filtered for the first time through a primary filtering system 2, the primary filtering system 1 is a multi-medium filter, the filtering precision is 0.1-5mm, large-particle pollutants with the particle size larger than or equal to 0.02 mu m in the raw water are removed, the primary filtered raw water enters an intermediate water tank 3, enters a security filter 9 through a low-pressure pump 8 and then enters a section of nanofiltration membrane device 11 through a high-pressure pump 10, produced water enters a water production pipe 13, the concentrated water enters a second section of nanofiltration membrane device 12 after being pressurized through a booster pump 15, the produced water enters a water production pipe 13, the concentrated water is discharged into a concentrated water pipe 14, the concentrated water pipe 14 is divided into two pipelines, the concentrated water pipe 1 is directly discharged, the concentrated water pipe 2 is connected to the front end of an inlet of the high-pressure pump 10, the concentrated water flows back, the water is improved in the water production rate of the system, and the concentrated water pipes 1 and 2 are respectively provided with a stop valve 16, so that the backflow rate can be adjusted.

The nanofiltration membrane device 11 and the nanofiltration membrane device 12 are internally provided with a plurality of nanofiltration membrane elements which are horizontally arranged in parallel and operate in parallel, the nanofiltration membrane is a polyamide membrane with the molecular weight cutoff of 200-800 dalton, can cut off nano-scale (0.001 micron) substances, has the salt rejection capacity of 20-90 percent, can greatly reduce the hardness of water, and ensures the quality of outlet water.

The reverse osmosis system 5 can be a first-stage reverse osmosis device for carrying out advanced treatment on reclaimed water. Because the outlet water quality of the nanofiltration device is high, the operation is more stable when the nanofiltration device enters the reverse osmosis membrane treatment stage, the cost of reverse osmosis needing cleaning and maintenance is low, and the membrane replacement frequency is also greatly reduced.

With the increasing severity of water resource depletion, the aggravation of environmental pollution and the improvement of reuse water standards, the advanced treatment technology of reclaimed water for removing various organic substances, salts and harmful chemical substances is valued and popularized.

Claims

1. The advanced treatment device for reclaimed water reuse is characterized in that: the device mainly comprises a raw water tank, a primary filtering system, an intermediate water tank, a nanofiltration system, a nanofiltration product water tank, a reverse osmosis system and a reuse water tank; the raw water tank is connected with the primary filtering system through a pipeline, and a raw water pump is arranged on the pipeline; the water outlet of the primary filtering system is connected with the intermediate water tank; the middle water tank is connected with the nanofiltration membrane system through a pipeline, and a low-pressure pump is arranged on the pipeline; the nanofiltration system mainly comprises a security filter, a high-pressure pump, a first-stage nanofiltration membrane device, a second-stage nanofiltration membrane device, a water production pipe and a concentrated water pipe, wherein the concentrated water of the first-stage nanofiltration membrane device is connected with the second-stage nanofiltration membrane device through a pipeline, the pipeline is provided with a booster pump, the produced water of the first-stage nanofiltration membrane device and the second-stage nanofiltration membrane device enters the nanofiltration water production tank through the water production pipe, and the concentrated water of the second-stage nanofiltration membrane device enters the concentrated water pipe; the nanofiltration water production tank is connected with the reverse osmosis system through a pipeline, and the produced water of the reverse osmosis system enters the reuse water tank.

2. The advanced treatment device for reclaimed water reuse according to claim 1, wherein: the primary filtering system is a quartz sand filter or a multi-medium filter, and the filtering precision is 0.01-5 mm.

3. The advanced treatment device for reclaimed water reuse according to claim 1, wherein: the back part of a concentrated water pipe of the nanofiltration system is provided with two pipelines, a No. 1 concentrated water pipe is directly discharged, a No. 2 concentrated water pipe is connected to the front end of an inlet of a high-pressure pump of the nanofiltration system, and a stop valve is arranged on the No. 2 concentrated water pipe.

4. The advanced treatment device for reclaimed water reuse according to claim 1, wherein: and a plurality of nanofiltration membrane elements are arranged in the nanofiltration membrane device, are horizontally arranged in parallel and operate in parallel, and are polyamide membranes with the molecular weight cutoff of 200-800 daltons.

5. The advanced treatment device for reclaimed water reuse according to claim 1, wherein: the reverse osmosis system can be a primary reverse osmosis device or a secondary reverse osmosis device according to the water demand.