Recycling treatment system for photovoltaic dilute acid wastewater

Abstract

The utility model provides a recycling treatment system for photovoltaic dilute acid wastewater. The recycling treatment system is used for treating dilute acid wastewater. According to the utility model, the pH adjusting tank and the ceramic membrane ultrafiltration are arranged, the dilute acid wastewater is adjusted to be neutral through the pH adjusting tank, and a small amount of silicon needs to be intercepted through ultrafiltration after neutralization, so that the pollution of particles to reverse osmosis is prevented. According to the utility model, an original cleaning device is utilized, and an original cleaning system is transformed, so that the construction period is shortened, and the re-purchasing cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of recycling and utilizing dilute acid wastewater, and in particular to a recycling and utilizing system for photovoltaic dilute acid wastewater. Background Art

[0002] The recovery of dilute acid wastewater is an important environmental and economic issue. Through appropriate treatment methods, the pollution of wastewater to the environment can be effectively reduced while recovering valuable acidic substances.

[0003] In the recycling and treatment of dilute acid wastewater, scaling and membrane fouling are common problems. The main causes are as follows:

[0004] (1) Due to the high concentration of silicon in photovoltaic dilute acid wastewater, it is indeed easy to cause pollution and scaling of conventional ultrafiltration membranes and reverse osmosis membranes. This phenomenon is mainly because silicon exists in wastewater in a complex form and is easy to aggregate and deposit on the membrane surface under certain conditions, resulting in a decrease in membrane performance.

[0005] (2) Since dilute acid wastewater contains a large amount of organic matter, colloids, suspended particles, etc., these substances are easy to adhere to the membrane surface, causing membrane pollution. Summary of the invention

[0006] The purpose of the present invention is to provide a photovoltaic dilute acid wastewater recycling and treatment system which will not cause scaling to produce membrane pollution and prevent particulate matter from polluting reverse osmosis.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A photovoltaic dilute acid wastewater recycling and treatment system, used for treating dilute acid wastewater, comprises a recycling collection tank, the inlet end of the recycling collection tank introduces dilute acid wastewater, the outlet end of the recycling collection tank is connected to the inlet end of the pH adjustment tank through a pump, the outlet end of the pH adjustment tank is connected to the inlet end of the CUF water supply tank, the outlet end of the CUF water supply tank is connected to the inlet end of the ceramic membrane ultrafiltration through a pump, the outlet end of the ceramic membrane ultrafiltration is backwashed and discharged to a ditch or a wastewater station, the other outlet end of the ceramic membrane ultrafiltration is connected to the inlet end of the CUF water production tank, and one outlet end of the CUF water production tank is connected to a primary reverse osmosis device through a pump. The inlet end of the first-stage reverse osmosis device is arranged, and one outlet end of the first-stage reverse osmosis device discharges the concentrated water to the ditch and / or wastewater station. The other outlet end of the first-stage reverse osmosis device is connected to the inlet end of the first-stage reverse osmosis water production tank. The outlet end of the first-stage reverse osmosis water production tank is connected to the inlet end of the second-stage reverse osmosis device through a pump. One outlet end of the second-stage reverse osmosis device connects the concentrated water to the other inlet end of the CUF water production tank. The other outlet end of the CUF water production tank is connected to the other inlet end of the ceramic membrane ultrafiltration through a pump. The other outlet end of the second-stage reverse osmosis device is respectively connected to the first-stage reverse osmosis water production tank and the second-stage reverse osmosis water production tank of the desalted water system.

[0009] Preferably, a self-cleaning filter is provided between the ceramic membrane ultrafiltration and the CUF water supply tank, the inlet end of the self-cleaning filter is connected to the outlet end of the CUF water supply tank through a pump, one outlet end of the self-cleaning filter is connected to the inlet end of the ceramic membrane ultrafiltration, and the other outlet end of the self-cleaning filter is backwashed and discharged to the ditch and / or wastewater station.

[0010] Preferably, sodium hydroxide and PAC are added into the pH adjustment tank, the sodium hydroxide is used to adjust the dilute acid wastewater to neutral, and the PAC is used to improve the retention rate of the ceramic membrane ultrafiltration.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] (1) The utility model provides a pH adjustment tank and a ceramic membrane ultrafiltration, and adjusts the dilute acid wastewater to neutrality through the pH adjustment tank. After neutralization, a small amount of silicon needs to be retained by ultrafiltration to prevent particulate matter from contaminating the reverse osmosis.

[0013] (2) The utility model utilizes the old original cleaning device and performs transformation on the original cleaning system, thus saving construction time and the cost of re-purchasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic structural diagram of a photovoltaic dilute acid wastewater recycling and treatment system provided in an embodiment of the present invention.

[0015] The serial numbers in the figure are as follows:

[0016] 1. Recycling collection tank; 2. pH adjustment tank; 3. CUF water supply tank; 4. Self-cleaning filter; 5. Ceramic membrane ultrafiltration; 6. CUF water production tank; 7. Primary reverse osmosis device; 8. Primary reverse osmosis water production tank; 9. Secondary reverse osmosis device; 10. Primary reverse osmosis water production tank; 11. Secondary reverse osmosis water production tank. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] like Figure 1 As shown, a photovoltaic dilute acid wastewater recycling treatment system provided by this embodiment is used to treat dilute acid wastewater, characterized in that it includes a recycling collection tank 1, the inlet end of the recycling collection tank 1 introduces dilute acid wastewater, the outlet end of the recycling collection tank 1 is connected to the inlet end of the pH adjustment tank 2 through a pump, the outlet end of the pH adjustment tank 2 is connected to the inlet end of the CUF water supply tank 3, the outlet end of the CUF water supply tank 3 is connected to the inlet end of the self-cleaning filter 4 through a pump, one outlet end of the self-cleaning filter 4 is connected to the inlet end of the ceramic membrane ultrafiltration 5, and the other outlet end of the self-cleaning filter 4 is backwashed and discharged to the ditch and / or wastewater station; the outlet end of the ceramic membrane ultrafiltration 5 is backwashed and discharged to the ditch and / or wastewater station, and the other outlet end of the ceramic membrane ultrafiltration 5 is connected to the inlet end of the CUF water production tank 6. The fluoride content of the dilute acid wastewater is not high, and the fluoride is converted into sodium fluoride after neutralization. Since the hardness in the water is very low, which is lower than the precipitation solubility product of calcium fluoride, it will not cause scaling membrane pollution. The concentration of dissolved pollutants in dilute acid wastewater is low, and the suspended solids need to be intercepted by ultrafiltration to ensure the normal operation of the membrane.

[0019] One outlet end of the CUF water production tank 6 is connected to the inlet end of the primary reverse osmosis device 7 through a pump, and one outlet end of the primary reverse osmosis device 7 discharges the concentrated water to the ditch and / or wastewater station, and the other outlet end of the primary reverse osmosis device 7 is connected to the inlet end of the primary reverse osmosis water production tank 8, and the outlet end of the primary reverse osmosis water production tank 8 is connected to the inlet end of the secondary reverse osmosis device 9 through a pump, and one outlet end of the secondary reverse osmosis device 9 connects the concentrated water to the other inlet end of the CUF water production tank, and the other outlet end of the CUF water production tank 6 is connected to the other inlet end of the ceramic membrane ultrafiltration 5 through a pump, and the other outlet end of the secondary reverse osmosis device 9 is respectively connected to the primary reverse osmosis water production tank 10 and the secondary reverse osmosis water production tank 11 of the desalted water system.

[0020] Further, in this embodiment, sodium hydroxide and PAC are added to the pH adjustment tank 2, wherein the sodium hydroxide is used to adjust the dilute acid wastewater to neutrality, and the PAC is used to increase the retention rate of the ceramic membrane ultrafiltration 5. The silicon content in the wastewater is not high, and a small amount of silicon needs to be retained by ultrafiltration after neutralization to prevent particulate matter from contaminating the reverse osmosis.

[0021] Furthermore, in this embodiment, the recycling collection tank 1 can utilize one raw water tank and one pretreatment tank of the first phase of the old U1 desalination station.

[0022] Furthermore, in this embodiment, the reverse osmosis cleaning system equipment and pipelines can use the old cleaning device. The ceramic membrane ultrafiltration 5 is equipped with a cleaning pump, and the other equipment can use the old cleaning device.

[0023] The working principle of the utility model is as follows:

[0024] A tee is added to the pipe gallery of the first and second phase dilute acid wastewater to lead it to the U1 desalted water station, enter the reuse collection tank 1, and be pumped to the pH adjustment tank 2. Sodium hydroxide is added to adjust the water to neutrality, and then PAC is added to increase the retention rate of the ceramic membrane ultrafiltration 5. The effluent enters the CUF water supply tank 3 and is pumped to the ceramic membrane ultrafiltration 5. The free silicon in the water is intercepted by the ceramic membrane ultrafiltration 5. The effluent enters the CUF water production tank 6 and is pumped to the primary reverse osmosis device 7 (reverse osmosis feed water pump and reverse osmosis The original first-stage desalination station primary reverse osmosis system), the concentrate pipeline of the primary reverse osmosis device 7 is transformed to the ditch, and finally transported to the wastewater treatment station through the desalination pit, the pipeline of the primary reverse osmosis water production tank is transformed, separated from the original desalination system water production pipeline, and the pipeline is re-laid to the recycled water primary reverse osmosis water production tank 8 (reusing the original primary reverse osmosis water production tank 1), and pumped to the secondary reverse osmosis device 9 (reverse osmosis water supply pump and reverse osmosis reuse the original first-stage desalination station secondary reverse osmosis system). The concentrate pipeline of the secondary reverse osmosis device 9 is separated from the desalination system, and the pipeline is re-laid to the recycled water CUF water production tank 6. The secondary reverse osmosis water is separated from the desalination system, and the pipeline is re-laid to the primary reverse osmosis water production tank 10 and the secondary reverse osmosis water production tank 11 of the desalination system.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A photovoltaic dilute acid wastewater recycling and treatment system for treating dilute acid wastewater, characterized in that: The invention comprises a recycling collection tank (1), wherein the inlet end of the recycling collection tank (1) introduces dilute acid wastewater, the outlet end of the recycling collection tank (1) is connected to the inlet end of a pH adjustment tank (2) through a pump, the outlet end of the pH adjustment tank (2) is connected to the inlet end of a CUF water supply tank (3), the outlet end of the CUF water supply tank (3) is connected to the inlet end of a ceramic membrane ultrafiltration (5) through a pump, the outlet end of the ceramic membrane ultrafiltration (5) is backwashed and discharged to a ditch or a wastewater station, the other outlet end of the ceramic membrane ultrafiltration (5) is connected to the inlet end of a CUF water production tank (6), one outlet end of the CUF water production tank (6) is connected to the inlet end of a primary reverse osmosis device (7) through a pump, and the primary reverse One outlet end of the osmosis device (7) discharges concentrated water to a ditch or a wastewater station, the other outlet end of the primary reverse osmosis device (7) is connected to the inlet end of the primary reverse osmosis water production tank (8), the outlet end of the primary reverse osmosis water production tank (8) is connected to the inlet end of the secondary reverse osmosis device (9) through a pump, one outlet end of the secondary reverse osmosis device (9) connects concentrated water to the other inlet end of the CUF water production tank, the other outlet end of the CUF water production tank (6) is connected to the other inlet end of the ceramic membrane ultrafiltration (5) through a pump, and the other outlet end of the secondary reverse osmosis device (9) is respectively connected to the primary reverse osmosis water production tank (10) and the secondary reverse osmosis water production tank (11) of the desalted water system.

2. A photovoltaic dilute acid wastewater recycling and treatment system according to claim 1, characterized in that: A self-cleaning filter (4) is provided between the ceramic membrane ultrafiltration (5) and the CUF water supply tank (3); the inlet end of the self-cleaning filter (4) is connected to the outlet end of the CUF water supply tank (3) via a pump; one outlet end of the self-cleaning filter (4) is connected to the inlet end of the ceramic membrane ultrafiltration (5); and the other outlet end of the self-cleaning filter (4) is backwashed and discharged to a ditch or a wastewater station.

3. The photovoltaic dilute acid wastewater recycling and treatment system according to claim 1 is characterized in that: Sodium hydroxide and PAC are added into the pH adjustment tank (2), wherein the sodium hydroxide is used to adjust the dilute acid wastewater to neutrality, and the PAC is used to increase the retention rate of the ceramic membrane ultrafiltration (5).

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