Nanofiltration membrane device capable of being applied to reuse of reclaimed water

Abstract

The nanofiltration membrane device mainly comprises a raw water tank, a raw water pump, a double-layer filter, a middle water tank, a low-pressure pump, a security filter, a high-pressure pump, a nanofiltration membrane system, a water production tank and a water supply system which are sequentially connected through pipelines, the nanofiltration membrane system mainly comprises a water inlet pipe, a nanofiltration membrane device, a water producing pipe, a producing and discharging pipe, a concentrated water pipe and a chemical washing system, and electric valves are arranged on the pipelines; the water supply system is composed of a water supply pump, a water supply pipe and a cleaning pipe, the cleaning pipe is connected to a water inlet pipe of the nanofiltration membrane system and provided with a cleaning electric valve, the water supply system can also serve as a flushing system of the nanofiltration membrane system, equipment is flushed after chemical washing, and the equipment investment of the system is reduced.

Description

Technical Field

[0001] The utility model specifically relates to a reclaimed water recycling device, belonging to the technical field of water treatment. Background Art

[0002] With population growth and industrialization, water scarcity is becoming increasingly severe. The traditional treatment method of discharging wastewater and introducing new water not only wastes a large amount of water resources but also causes serious environmental pollution. Therefore, the rational use and recycling of water resources has become a topic of widespread concern in various countries, and wastewater treatment plant water reuse is an important solution.

[0003] Implementing a water reuse program not only protects water resources and the environment, but also brings significant economic benefits. By reusing water, we can reduce the demand for freshwater resources and lower water costs, effectively realizing the reuse of water resources, protecting the environment, and improving economic benefits.

[0004] Due to the complex composition of reclaimed water and its high organic content, biochemical treatment methods and membrane system treatment are currently used, which mainly target organic matter, microorganisms and suspended solids in the water, but are not effective in treating hardness, alkalinity, bacteria, etc. in the water. On the other hand, due to the limitations of equipment scale, operating costs and professional technology, reclaimed water treatment has not yet been widely used. Summary of the Invention

[0005] In order to overcome the technical problems existing in the prior art, the purpose of the utility model is to provide a nanofiltration membrane device that can be used for reclaimed water reuse, which is easy to operate, stable in operation, and has high water quality.

[0006] The utility model provides a nanofiltration membrane device that can be used for reclaimed water reuse, which is characterized by: it is mainly composed of a raw water tank, a raw water pump, a double-layer filter, an intermediate water tank, a low-pressure pump, a safety filter, a high-pressure pump, a nanofiltration membrane system, a water production tank and a water supply system that are connected in sequence through pipelines; the nanofiltration membrane system is mainly composed of an inlet pipe, a nanofiltration membrane device, a water production pipe, a production and discharge pipe, a concentrate pipe and a drug washing system, and the pipelines are all provided with electric valves; the water supply system is composed of a water supply pump, a water supply pipe and a cleaning pipe, the cleaning pipe is connected to the water inlet pipe of the nanofiltration membrane system, and is provided with a cleaning electric valve, and the water supply system can also be used as a flushing system for the nanofiltration membrane system, which flushes the equipment after drug washing, thereby reducing the equipment investment of the system.

[0007] Furthermore, the double-layer filter is mainly composed of a tank body, upper filter layer filter material, lower filter layer filter material, a water distributor, an inlet pipe, an outlet pipe, a backwash pipe, a sewage pipe and a backwash pump; the filter materials in the upper filter layer and the lower filter layer are alkaline ceramic ball filter material and AFM filter material respectively. Through the adsorption and filtration effect of the filter material, the raw water is pretreated to remove impurities and colloids in the raw water; the backwash pump is arranged on the backwash pipe, the backwash pipe is connected to the intermediate water tank, and the backwash pump uses the water in the intermediate water tank to backwash the double-layer filter; the inlet pipe, outlet pipe, backwash pipe and sewage pipe are all provided with electric valves, which can realize the fully automatic operation of the double-layer filter.

[0008] A nanofiltration membrane device that can be used for reclaimed water reuse is further described, characterized in that: the chemical washing system includes a chemical washing water tank, a chemical washing pump, a precision filter, a chemical washing water inlet pipe, a chemical washing production and discharge pipe, and a chemical washing concentrate discharge pipe; the chemical washing water inlet pipe is connected to the water inlet pipe of the nanofiltration membrane system and is provided with a chemical washing water inlet electric valve; the chemical washing production and discharge pipe is connected to the production water pipe of the nanofiltration membrane system and is provided with a chemical washing production and discharge valve; the chemical washing concentrate discharge pipe is connected to the concentrate water pipe of the nanofiltration membrane system and is provided with a chemical washing concentrate discharge valve; the chemical wash production and discharge pipe and the chemical wash concentrate discharge pipe are collected and connected to the chemical washing water tank.

[0009] The utility model provides a nanofiltration membrane device that can be applied to reclaimed water reuse. Its beneficial effect lies in that a double-layer filter is used as a pretreatment system. The ceramic ball filter material and AFM filter material in the double-layer filter have large specific surface area and strong adsorption capacity. The filter material has extremely strong redox ability and antibacterial function, and has higher filtration accuracy than traditional filtration equipment. In addition, the filter material has a long service life and will not become caking, and the effluent water quality is high. The designed nanofiltration membrane system has a high water production rate, a simple process, a high automation function, and low equipment sharing investment, and can be promoted and used in the reclaimed water reuse process. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attachment Figure 1 This is a structural diagram of an implementation method of the utility model.

[0011] In the figure, 1. Raw water tank; 2. Raw water pump; 3. Double-layer filter; 4. Intermediate water tank; 5. Low-pressure pump; 6. Safety filter; 7. High-pressure pump; 8. Nanofiltration membrane system; 9. Water production tank; 10. Water supply system; 11. Water supply pump; 12. Water supply pipe; 13. Cleaning pipe; 14. Cleaning electric valve; 31. Tank body; 32. Upper filter layer filter material; 33. Lower filter layer filter material; 34. Water distributor; 35. Water inlet pipe; 36. Water outlet pipe; 37. Backwash pipe; 38. Sewage pipe; 39. Backwash pump; 40. Electric valve.

[0012] Attachment Figure 2 Schematic diagram of the process of nanofiltration membrane system.

[0013] In the figure, 81, water inlet pipe; 82, nanofiltration membrane device; 83, production water pipe; 84, production and discharge pipe; 85, concentrate pipe; 86, electric control valve; 87, composition of chemical washing system; 87a, chemical washing water tank; 87b, chemical washing pump; 87c, precision filter; 87d, chemical washing water inlet pipe; 87e, chemical washing production and discharge pipe; 87f, chemical washing concentrate discharge pipe; 87g, chemical washing water inlet electric valve; 87h, chemical washing production and discharge valve; 87i, chemical washing concentrate discharge valve. DETAILED DESCRIPTION

[0014] The following is combined with Figure 1 , Attachment Figure 2 The specific implementation methods of the present utility model are further described.

[0015] A nanofiltration membrane device that can be used for reclaimed water reuse mainly consists of a raw water tank 1, a raw water pump 2, a double-layer filter 3, an intermediate water tank 4, a low-pressure pump 5, a safety filter 6, a high-pressure pump 7, a nanofiltration membrane system 8, a production water tank 9 and a water supply system 10 connected in sequence by pipelines; the nanofiltration membrane system 8 mainly consists of an inlet pipe 81, a nanofiltration membrane device 82, a production water pipe 83, a production and discharge pipe 84, a concentrate pipe 85 and a drug washing system 87, and all of the pipelines are provided with electric control valves 86; the water supply system 10 consists of a water supply pump 11, a water supply pipe 12 and a cleaning pipe 13, the cleaning pipe 13 is connected to the water inlet pipe 81 of the nanofiltration membrane system 8, and is provided with a cleaning electric valve 14.

[0016] The raw water is first pretreated by a double-layer filter 3 to remove impurities and colloids in the raw water. The double-layer filter 3 is mainly composed of a tank body 31, an upper filter layer filter material 32, a lower filter layer filter material 33, a water distributor 34, an inlet pipe 35, an outlet pipe 36, a backwash pipe 37, a sewage pipe 38 and a backwash pump 39; the upper filter layer 32 and the lower filter layer filter material are alkaline ceramic ball filter material and AFM filter material respectively; the backwash pump 39 is arranged on the backwash pipe 37, and the backwash pipe 37 is connected to the intermediate water tank 4; the inlet pipe 36, the outlet pipe 36, the backwash pipe 37 and the sewage pipe 38 are all provided with electric valves 40, which can realize the fully automatic operation of the double-layer filter.

[0017] The ceramic ball and AFM filter media in the double-layer filter 3 have a large specific surface area and strong adsorption capacity. The media also has antibacterial properties, resulting in higher filtration accuracy than traditional filtration equipment. Furthermore, the media has a long lifespan and is immune to caking, requiring only a period of operation before backwashing. During backwashing, the electric valves 40 on the inlet and outlet pipes 35 and 36 are closed, while the electric valves 40 on the backwash and sewage pipes 37 and 38 are opened, and the backwash pump 39 is activated. Backwash pump 39 uses water from the intermediate water tank 4 to backwash the double-layer filter 3.

[0018] The water in the intermediate water tank 4 enters the nanofiltration membrane system 8 through the low-pressure pump 5, the security filter 6, and the high-pressure pump 7 to deeply purify the water and realize the function of reclaimed water reuse. After the equipment has been running for a period of time, the nanofiltration membrane device 82 is chemically washed through the chemical washing system 87. The chemical washing system 87 includes a chemical washing water tank 87a, a chemical washing pump 87b, a precision filter 87c, a chemical washing water inlet pipe 87d, a chemical washing production and discharge pipe 87e, and a chemical washing concentrated discharge pipe 87f. The wash water inlet pipe 87d is connected to the water inlet pipe 81 of the nanofiltration membrane system 8 and is provided with a drug wash water inlet electric valve 87g. The drug wash production and discharge pipe 87e is connected to the production water pipe 83 of the nanofiltration membrane system 8 and is provided with a drug wash production and discharge valve 87h. The drug wash concentrate discharge pipe 87f is connected to the concentrate water pipe 85 of the nanofiltration membrane system 8 and is provided with a drug wash concentrate discharge valve 87i; the drug wash production and discharge pipe 87e and the drug wash concentrate discharge pipe 87f are collected and connected to the drug wash water tank 87a. During chemical washing, the electric control valves 86 on the pipeline of the nanofiltration membrane system 8 are all closed, the chemical washing water inlet electric valve 87g, the chemical washing production and discharge valve 87h, and the chemical washing concentrate discharge valve 87i are all opened, the chemical washing pump is turned on, and the cleaned chemical washing water returns to the chemical washing water tank 87a. After chemical washing, the nanofiltration membrane system needs to be flushed with the water supply pump 11 and the cleaning pipe 13 of the water supply system 10 and then restarted to realize the sharing of the water supply system and the flushing system, reducing equipment investment.

Claims

1. A nanofiltration membrane device applicable to reclaimed water reuse, characterized by: It mainly consists of a raw water tank, a raw water pump, a double-layer filter, an intermediate water tank, a low-pressure pump, a safety filter, a high-pressure pump, a nanofiltration membrane system, a water production tank and a water supply system connected in sequence through pipes; the nanofiltration membrane system mainly consists of an inlet pipe, a nanofiltration membrane device, a water production pipe, a production and discharge pipe, a concentrate pipe and a drug washing system, and the pipes are all equipped with electric valves; the water supply system consists of a water supply pump, a water supply pipe and a cleaning pipe, and the cleaning pipe is connected to the water inlet pipe of the nanofiltration membrane system and is provided with a cleaning electric valve.

2. A nanofiltration membrane device applicable to reclaimed water reuse according to claim 1, characterized in that: The double-layer filter is mainly composed of a tank body, upper filter layer filter material, lower filter layer filter material, a water distributor, an inlet pipe, an outlet pipe, a backwash pipe, a sewage pipe and a backwash pump; the filter materials in the upper filter layer and the lower filter layer are alkaline ceramic ball filter material and AFM filter material respectively; the backwash pump is arranged on the backwash pipe, and the backwash pipe is connected to the intermediate water tank; the inlet pipe, outlet pipe, backwash pipe and sewage pipe are all provided with electric valves.

3. The nanofiltration membrane device applicable to reclaimed water reuse according to claim 1, characterized in that: The chemical washing system includes a chemical washing water tank, a chemical washing pump, a precision filter, a chemical washing water inlet pipe, a chemical washing production and discharge pipe, and a chemical washing concentrate discharge pipe. The chemical washing water inlet pipe is connected to the water inlet pipe of the nanofiltration membrane system and is provided with a chemical washing water inlet electric valve. The chemical washing production and discharge pipe is connected to the production water pipe of the nanofiltration membrane system and is provided with a chemical washing production and discharge valve. The chemical washing concentrate discharge pipe is connected to the concentrate water pipe of the nanofiltration membrane system and is provided with a chemical washing concentrate discharge valve. The chemical washing production and discharge pipe and the chemical washing concentrate discharge pipe are collected and connected to the chemical washing water tank.

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