Secondary reverse osmosis water reuse equipment with evaporator

Abstract

The utility model belongs to water treatment equipment technical field more specifically relates to a kind of secondary reverse osmosis reclaimed water reuse equipment with evaporator, including reclaimed water reuse pool, several pre-filters, several parallel ultrafilters, intermediate water tank, first booster pump, first reverse osmosis membrane group, concentrated water tank, second booster pump, second reverse osmosis membrane group, pure water tank and MBR evaporator equipment, the MBR evaporator equipment includes evaporator, forced circulation pump, steam separator, first delivery pump and crystallization tank, by the series connection and parallel connection design of two groups of reverse osmosis membrane group, and the depth treatment of MBR evaporator to concentrated water, water resources can be recovered to maximum limit, and the discharge of concentrated water is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment equipment technology, and more specifically relates to a two-stage reverse osmosis greywater reuse device with an evaporator. Background Technology

[0002] Reclaimed water reuse refers to the process of treating domestic sewage and industrial wastewater to meet certain water quality standards and then reusing it for non-potable purposes such as industrial production, urban greening, road cleaning, vehicle washing, and construction. It can also be further purified to obtain pure water. Traditional treatment equipment mainly uses single-stage reverse osmosis to obtain pure water. However, the concentrated water produced by only one stage of reverse osmosis still has considerable potential for utilization, resulting in a certain waste of water resources. At the same time, traditional equipment directly discharges the concentrated water, which can easily cause environmental pollution. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a two-stage reverse osmosis greywater reuse device with an evaporator, which maximizes the recovery of water resources and reduces the discharge of concentrated wastewater.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a two-stage reverse osmosis greywater reuse device with an evaporator, comprising a greywater reuse tank, several pre-filters, several parallel ultrafilters, an intermediate water tank, a first booster pump, a first reverse osmosis membrane module, a concentrate tank, a second booster pump, a second reverse osmosis membrane module, a pure water tank, and an MBR evaporator device. The MBR evaporator device includes an evaporator, a forced circulation pump, a steam separator, a first delivery pump, and a crystallization tank. The steam inlet of the evaporator is connected to the steam outlet and steam replenishment pipeline of the steam separator. The material outlet of the evaporator is connected to the inlet of the first booster pump. The waste outlet of the evaporator is connected to the steam separator. The material inlet of the evaporator is connected to the forced circulation pump. The forced circulation pump is connected to the circulation outlet on the steam separator and simultaneously connected to the concentrate outlet of the second reverse osmosis membrane module. The waste outlet of the steam separator is connected to the first delivery pump to discharge crystallization wastewater into the crystallization tank.

[0005] Furthermore, the plurality of pre-filters include a multi-media filter, a softening filter, and a precision filter connected in sequence. The wastewater outlets of the multi-media filter and the softening filter are connected to a sewage discharge pipe, and a softening brine tank is provided on one side of the softening filter.

[0006] Furthermore, the first reverse osmosis membrane module includes three reverse osmosis filters, two of which are connected in parallel. The two parallel reverse osmosis filters are connected in series with the last reverse osmosis filter. The inlet of the two parallel reverse osmosis filters is connected to an intermediate water tank through a first booster pump. The concentrate outlet of the two parallel reverse osmosis filters is connected to the inlet of the last reverse osmosis filter. The concentrate outlet of the last reverse osmosis filter is connected to a concentrate tank. The pure water outlet of all three reverse osmosis filters is connected to a pure water tank.

[0007] Furthermore, the second reverse osmosis membrane module includes two reverse osmosis filters connected in series. The inlet of the first reverse osmosis filter is connected to the concentrate tank via a second booster pump. The concentrate outlet of the first reverse osmosis filter is connected to the inlet of the second reverse osmosis filter. The pure water outlets of both reverse osmosis filters are connected to the pure water tank. The concentrate outlet of the second reverse osmosis filter is connected to the sewage discharge pipe.

[0008] Furthermore, the purified water outlets of the multiple parallel ultrafiltration units are connected to an intermediate water tank, and the wastewater outlets are connected to a sewage pipe.

[0009] Furthermore, a bypass pipe is provided between the inlet and outlet of both the first booster pump and the second booster pump, and a bypass valve is provided on the bypass pipe.

[0010] Furthermore, it also includes a raw water pump connected to the greywater reuse tank and a second transfer pump connected to the pure water tank.

[0011] Furthermore, level sensors are installed in the intermediate water tank, concentrated water tank, and pure water tank.

[0012] Compared with the prior art, the beneficial effects of this utility model are: through the series and parallel design of two sets of reverse osmosis membrane modules, and the deep treatment of concentrate by the MBR evaporator, water resources can be recovered to the maximum extent and the amount of concentrate discharged can be reduced. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the two-stage reverse osmosis greywater reuse equipment with an evaporator according to this utility model.

[0014] Figure reference numerals: 1. Reclaimed water tank; 2. Ultrafiltration unit; 3. Intermediate water tank; 4. First booster pump; 5. First reverse osmosis membrane module; 6. Concentrate tank; 7. Second booster pump; 8. Second reverse osmosis membrane module; 9. Pure water tank; 10. Evaporator; 11. Forced circulation pump; 12. Steam separator; 13. First transfer pump; 14. Crystallization tank; 15. Multi-media filter; 16. Softening filter; 17. Precision filter; 18. Softening brine tank; 19. Bypass pipe; 20. Bypass valve; 21. Raw water pump; 22. Second transfer pump; 23. Liquid level sensor. Detailed Implementation

[0015] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0017] Reference Figure 1 The present invention will be further described below.

[0018] A two-stage reverse osmosis (RO) wastewater reuse system with an evaporator includes a wastewater reuse tank 1, several pre-filters, several parallel ultrafiltration units 2, an intermediate water tank 3, a first booster pump 4, a first RO membrane module 5, a concentrate tank 6, a second booster pump 7, a second RO membrane module 8, a pure water tank 9, and an MBR evaporator. The MBR evaporator includes an evaporator 10, a forced circulation pump 11, a steam separator 12, a first transfer pump 13, and a crystallization tank 14. The steam inlet of the evaporator 10 is connected to the steam outlet and steam replenishment pipe of the steam separator 12. The material outlet of the evaporator 10 is connected to the inlet of the first booster pump 4. The waste outlet of the evaporator 10 is connected to the steam separator 12. The material inlet of the evaporator 10 is connected to the forced circulation pump 11. The forced circulation pump 11 is connected to the circulation outlet on the steam separator 12 and simultaneously connected to the concentrate outlet of the second RO membrane module 8. The waste outlet of the steam separator 12 is connected to the first transfer pump 13, discharging the crystallization wastewater into the crystallization tank 14. Figure 1 As shown, in this preferred embodiment, the plurality of pre-filters include a multi-media filter 15, a softening filter 16, and a precision filter 17 connected in sequence. The wastewater outlets of the multi-media filter 15 and the softening filter 16 are connected to a sewage pipe, and a softening brine tank 18 is provided on one side of the softening filter 16. Specifically, the multi-media filter 15 removes suspended solids, solid or colloidal particles from the water; the softening filter 16 removes hardness ions such as calcium and magnesium from the water, softening the water; and the precision filter 17 removes tiny particles from the water. Figure 1As shown, in this preferred embodiment, the first reverse osmosis membrane module 5 includes three reverse osmosis filters, two of which are connected in parallel. These two parallel reverse osmosis filters are connected in series with the last reverse osmosis filter. The inlets of the two parallel reverse osmosis filters are connected to the intermediate water tank 3 via a first booster pump 4. The concentrate outlets of the two parallel reverse osmosis filters are connected to the inlet of the last reverse osmosis filter. The concentrate outlet of the last reverse osmosis filter is connected to the concentrate tank 6. The pure water outlets of all three reverse osmosis filters are connected to the pure water tank 9. Specifically, the concentrate filtered by the two parallel reverse osmosis filters enters the last reverse osmosis filter for further reverse osmosis filtration, improving the concentrate utilization rate. Figure 1 As shown, in this preferred embodiment, the second reverse osmosis membrane module 8 includes two reverse osmosis filters connected in series. The inlet of the first reverse osmosis filter is connected to the concentrate tank 6 via a second booster pump 7. The concentrate outlet of the first reverse osmosis filter is connected to the inlet of the second reverse osmosis filter. The pure water outlets of both reverse osmosis filters are connected to a pure water tank 9. The concentrate outlet of the second reverse osmosis filter is connected to a drain pipe. Specifically, the two reverse osmosis filters connected in series continuously filter the concentrate, further improving the concentrate utilization rate. Figure 1 As shown, in this preferred embodiment, the purified water outlets of the multiple parallel ultrafiltration units 2 are connected to the intermediate water tank 3, and the wastewater outlets are connected to the sewage pipe. Specifically, the sewage pipe can be directly connected to the sewer system, because the recycled purified water has already undergone wastewater treatment, and impurities and concentrated water generated by each filter in the equipment can be directly discharged into the sewer system. Figure 1 As shown, in this preferred embodiment, a bypass pipe 19 is provided between the inlet and outlet of both the first booster pump 4 and the second booster pump 7, and a bypass valve 20 is provided on the bypass pipe 19. Specifically, when the pressure is too high, the bypass valve 20 can be opened to allow the high-pressure water at the booster pump outlet to flow back and reduce the pressure. Figure 1 As shown, in this preferred embodiment, it further includes a raw water pump 21 connected to the greywater reuse tank 1 and a second delivery pump 22 connected to the pure water tank 9. Figure 1 As shown, in this preferred embodiment, level sensors 23 are installed in the intermediate water tank 3, the concentrate tank 6, and the pure water tank 9. Figure 1As shown, the treated wastewater is collected in the reclaimed water tank 1. The treated water is then pumped by the raw water pump 21 to several pre-filters, where it is filtered through a multi-media filter 15, a softening filter 16, and a precision filter 17 to form primary filtered water. This primary filtered water then directly enters multiple parallel ultrafiltration units 2 to produce secondary filtered water, which is then collected in the intermediate water tank 3. The secondary filtered water in the intermediate water tank 3 is pumped by the first booster pump 4 into the first reverse osmosis membrane module 5, where the resulting pure water is collected in the pure water tank 9, and the concentrated water is collected in the concentrated water tank 6. The concentrated water in the concentrated water tank 6 is pumped by the second booster pump 7 into the second reverse osmosis membrane module 8, where the resulting pure water... The water enters the pure water tank 9 for collection. The concentrated water produced is then pumped into the evaporator 10 by the forced circulation pump 11. Through membrane separation and high-temperature and high-pressure heat collection in the evaporator 10, the high-concentration water is evaporated and concentrated. The resulting distilled water enters between the intermediate water tank 3 and the first booster pump 4. After mixing with the secondary filtered water supplied by the intermediate water tank 3, it enters the reverse osmosis filter. The concentrated water after evaporation and concentration in the evaporator 10 enters the steam separator 12 to separate some of the evaporated steam, further concentrating the concentrated water. Finally, it is discharged into the crystallization tank 14 for crystallization, while the separated steam re-enters the evaporator 10 for use. The pure water in the pure water tank 9 can be transported to the water-using equipment by the second transfer pump 22.

[0019] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A two-stage reverse osmosis greywater reuse device with an evaporator, characterized in that: The system includes a greywater reuse tank, several pre-filters, several parallel ultrafiltration units, an intermediate water tank, a first booster pump, a first reverse osmosis membrane module, a concentrate tank, a second booster pump, a second reverse osmosis membrane module, a pure water tank, and an MBR evaporator. The MBR evaporator includes an evaporator, a forced circulation pump, a steam separator, a first transfer pump, and a crystallization tank. The steam inlet of the evaporator is connected to the steam outlet and steam replenishment pipeline of the steam separator. The material outlet of the evaporator is connected to the inlet of the first booster pump. The waste outlet of the evaporator is connected to the steam separator. The material inlet of the evaporator is connected to the forced circulation pump. The forced circulation pump is connected to the circulation outlet on the steam separator and simultaneously connected to the concentrate outlet of the second reverse osmosis membrane module. The waste outlet of the steam separator is connected to the first transfer pump to discharge crystallization wastewater into the crystallization tank.

2. The two-stage reverse osmosis wastewater reuse equipment with an evaporator according to claim 1, characterized in that: The plurality of pre-filters include a multi-media filter, a softening filter and a precision filter connected in sequence. The wastewater outlets of the multi-media filter and the softening filter are connected to a sewage discharge pipe. A softening brine tank is provided on one side of the softening filter.

3. The two-stage reverse osmosis wastewater reuse equipment with an evaporator according to claim 1, characterized in that: The first reverse osmosis membrane module includes three reverse osmosis filters, two of which are connected in parallel. The two parallel reverse osmosis filters are connected in series with the last reverse osmosis filter. The inlet of the two parallel reverse osmosis filters is connected to an intermediate water tank through a first booster pump. The concentrate outlet of the two parallel reverse osmosis filters is connected to the inlet of the last reverse osmosis filter. The concentrate outlet of the last reverse osmosis filter is connected to a concentrate tank. The pure water outlet of all three reverse osmosis filters is connected to a pure water tank.

4. The two-stage reverse osmosis wastewater reuse equipment with an evaporator according to claim 1, characterized in that: The second reverse osmosis membrane module includes two reverse osmosis filters connected in series. The inlet of the first reverse osmosis filter is connected to the concentrate tank via a second booster pump. The concentrate outlet of the first reverse osmosis filter is connected to the inlet of the second reverse osmosis filter. The pure water outlets of both reverse osmosis filters are connected to the pure water tank. The concentrate outlet of the second reverse osmosis filter is connected to the sewage discharge pipe.

5. The two-stage reverse osmosis wastewater reuse equipment with an evaporator according to claim 1, characterized in that: The water outlets of the multiple parallel ultrafiltration units are connected to an intermediate water tank, and the wastewater outlets are connected to a sewage pipe.

6. The two-stage reverse osmosis wastewater reuse equipment with an evaporator according to claim 1, characterized in that: A bypass pipe is provided between the inlet and outlet of the first booster pump and the second booster pump, and a bypass valve is provided on the bypass pipe.

7. The two-stage reverse osmosis wastewater reuse equipment with an evaporator according to claim 1, characterized in that: It also includes a raw water pump that connects to the greywater reuse tank and a second transfer pump that connects to the pure water tank.

8. The two-stage reverse osmosis wastewater reuse equipment with an evaporator according to claim 1, characterized in that: Liquid level sensors are installed in the intermediate water tank, concentrated water tank, and pure water tank.

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