A photovoltaic panel production wastewater treatment system

Abstract

The utility model provides a photovoltaic panel production wastewater treatment system, including water collecting pool, pre -sedimentation tank, pH adjusting unit, filter unit, primary reverse osmosis device, secondary reverse osmosis device, reaction pool group, sedimentation tank, the water outlet of water collecting pool is linked together with pre -sedimentation tank, the water outlet of pre -sedimentation tank is linked together with the inlet of filter unit, the water outlet of filter unit is linked together with the inlet of primary reverse osmosis device, the concentrated water outlet of primary reverse osmosis device is linked together with reaction pool group, the water outlet of reaction pool group is linked together with sedimentation tank, the water production outlet of primary reverse osmosis device is linked together with the inlet of secondary reverse osmosis device, the utility model discloses utilize two -stage reverse osmosis device, effectively reduce the harmful ion content in wastewater, and the final water production reaches the reuse standard, and is recycled for production, realizes water resource utilization.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a wastewater treatment system for photovoltaic panel production. Background Technology

[0002] With the global climate change problem becoming increasingly severe, reducing greenhouse gas emissions has become an international consensus. Solar energy, as a green and renewable energy source, is seeing its core component, photovoltaic panels, undergo continuous expansion in production scale. However, the wastewater pollution problem generated during the photovoltaic panel production process has not received sufficient attention.

[0003] Wastewater from photovoltaic panel production mainly originates from the silicon wafer texturing and wet etching processes in the battery workshop. It has a complex composition and is highly polluting, including:

[0004] 1. Waste acid liquid: contains highly corrosive substances such as nitric acid, hydrofluoric acid, and hydrochloric acid;

[0005] 2. Waste alkaline solutions: such as potassium hydroxide solution;

[0006] 3. Acid / alkali cleaning water: Contains high concentrations of fluoride ions (F... - ), silicon ions (SiO3) 2- ) and heavy metal ions.

[0007] If this type of wastewater is discharged directly, fluoride ions and silicates can easily cause water pollution, soil compaction, and ecological damage.

[0008] Therefore, there is an urgent need to develop an efficient and low-cost wastewater treatment system for photovoltaic panel production that can deeply remove fluoride and silicon ions while reusing the wastewater, in order to solve the dual problems of environmental pollution and resource waste. Utility Model Content

[0009] The purpose of this invention is to provide a wastewater treatment system for photovoltaic panel production.

[0010] Therefore, the above-mentioned objective of this utility model is achieved through the following technical solution:

[0011] A photovoltaic panel production wastewater treatment system includes a water collection tank, a pre-sedimentation tank, a pH adjustment unit, a filtration unit, a primary reverse osmosis unit, a secondary reverse osmosis unit, a reaction tank group, and a sedimentation tank.

[0012] The outlet of the water collection tank is connected to the pre-sedimentation tank, which is used to remove suspended solids, colloids and other substances from the wastewater.

[0013] The outlet of the pre-sedimentation tank is connected to the inlet of the filtration unit;

[0014] The outlet of the filtration unit is connected to the inlet of the first-stage reverse osmosis device;

[0015] The concentrate outlet of the first-stage reverse osmosis unit is connected to the reaction tank group;

[0016] The outlet of the reaction tank group is connected to the sedimentation tank;

[0017] The product water outlet of the first-stage reverse osmosis unit is connected to the inlet of the second-stage reverse osmosis unit. The first-stage reverse osmosis unit is used to concentrate and reduce the volume of wastewater, while retaining silicon ions and fluoride ions in the concentrated water.

[0018] While adopting the above technical solutions, this utility model may also adopt or combine the following technical solutions:

[0019] As a preferred technical solution of this utility model: the photovoltaic panel production wastewater treatment system is further provided with an intermediate water tank, a concentrated water tank and a product water tank;

[0020] The intermediate water tank is installed on the connecting pipe between the pH adjustment unit and the filtration unit;

[0021] The concentrate tank is installed on the connecting pipeline between the first-stage reverse osmosis unit and the reaction tank group;

[0022] The product water tank is installed on the connecting pipeline between the primary reverse osmosis unit and the secondary reverse osmosis unit.

[0023] As a preferred technical solution of this utility model: the intermediate water tank is connected to the concentrate outlet of the secondary reverse osmosis device.

[0024] As a preferred technical solution of this utility model: the water production tank is equipped with a hydrochloric acid dosing device.

[0025] As a preferred technical solution of this utility model: the pH adjustment unit is a pH adjustment tank, for example: adding hydrochloric acid or calcium hydroxide to adjust the pH.

[0026] As a preferred technical solution of this utility model: the filtration unit includes a carbon filter and a sand filter connected in sequence by a pipeline to remove suspended solids, oxidizing substances and the like from the wastewater.

[0027] As a preferred embodiment of this utility model, the reaction tank group includes a primary reaction tank, a secondary reaction tank, and a tertiary reaction tank connected sequentially by pipelines.

[0028] The primary reaction tank is equipped with a quicklime dosing device;

[0029] The secondary reaction tank is equipped with a calcium chloride dosing device;

[0030] The three-stage reaction tank is equipped with a flocculant / coagulant dosing device.

[0031] As a preferred technical solution of this utility model: mechanical stirring devices are provided in the primary reaction tank, the secondary reaction tank and the tertiary reaction tank.

[0032] As a preferred technical solution of this utility model: the photovoltaic panel production wastewater treatment system is further provided with a sludge treatment device;

[0033] The sludge treatment device is one of the following: plate and frame filter press, belt filter press, or centrifugal dewatering machine.

[0034] This utility model provides a photovoltaic panel production wastewater treatment system, which has the following beneficial effects:

[0035] (1) The system equipment is simple and highly operable;

[0036] (2) Utilizing a two-stage reverse osmosis system: The first-stage reverse osmosis system separates silicon ions and fluoride ions from the wastewater and retains them in the concentrate; the second-stage reverse osmosis system removes fluoride ions and other ions and retains them in the concentrate, thereby purifying the water quality, effectively reducing the content of harmful ions in the wastewater, and ultimately producing water that meets the reuse standards and is reused in production, thus realizing the utilization of water resources.

[0037] (3) It can effectively solve the problems of ecological damage and environmental pollution caused by wastewater discharge from photovoltaic panel production, and has good economic and social benefits. Attached Figure Description

[0038] Figure 1 A diagram illustrating the photovoltaic panel production wastewater treatment system provided by this utility model. Detailed Implementation

[0039] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0040] A photovoltaic panel production wastewater treatment system includes a water collection tank 101, a pre-sedimentation tank 201, a pH adjustment unit 301, a filtration unit, a primary reverse osmosis device 501, a secondary reverse osmosis device 502, a reaction tank group, and a sedimentation tank 701.

[0041] The outlet of the water collection tank 101 is connected to the pre-sedimentation tank 201, which is used to remove suspended solids, colloids and other substances from the wastewater.

[0042] The outlet of the pre-sedimentation tank 201 is connected to the inlet of the filtration unit;

[0043] The outlet of the filtration unit is connected to the inlet of the first-stage reverse osmosis unit 501;

[0044] The concentrate outlet of the first-stage reverse osmosis unit 501 is connected to the reaction tank group;

[0045] The outlet of the reaction tank group is connected to the sedimentation tank 701;

[0046] The product water outlet of the first-stage reverse osmosis unit 501 is connected to the inlet of the second-stage reverse osmosis unit 502. The first-stage reverse osmosis unit 501 is used to concentrate and reduce the volume of wastewater, while retaining silicon ions and fluoride ions in the concentrated water.

[0047] In this embodiment: the photovoltaic panel production wastewater treatment system is also equipped with an intermediate water tank 801, a concentrated water tank 802 and a product water tank 803;

[0048] The intermediate water tank 801 is installed on the connecting pipe between the pH adjustment unit 301 and the filter unit, and the intermediate water tank 801 is connected to the concentrate outlet of the secondary reverse osmosis unit 502.

[0049] The concentrate tank 802 is installed on the connecting pipeline between the first-stage reverse osmosis unit 501 and the reaction tank group;

[0050] The product water tank 803 is installed on the connecting pipeline between the first-stage reverse osmosis unit 501 and the second-stage reverse osmosis unit 502, and the product water tank 803 is equipped with a hydrochloric acid dosing device.

[0051] In this embodiment: pH adjustment unit 301 is a pH adjustment tank, for example: adding hydrochloric acid or calcium hydroxide to adjust the pH.

[0052] In this embodiment, the filtration unit includes a carbon filter 401 and a sand filter 402 connected in sequence by a pipe to remove suspended solids, oxidizing substances, etc. from the wastewater.

[0053] In this embodiment: the reaction tank group includes a primary reaction tank 601, a secondary reaction tank 602, and a tertiary reaction tank 603, which are connected in sequence by pipelines.

[0054] The primary reaction tank 601 is equipped with a quicklime dosing device;

[0055] The secondary reaction tank 602 is equipped with a calcium chloride dosing device;

[0056] The three-stage reaction tank 603 is equipped with a flocculant / coagulant dosing device.

[0057] In this embodiment, mechanical stirring devices are provided in the primary reaction tank 601, the secondary reaction tank 602, and the tertiary reaction tank 603.

[0058] In this embodiment: the photovoltaic panel production wastewater treatment system is also equipped with a sludge treatment device 901, which is a plate and frame filter press.

[0059] The aforementioned photovoltaic panel production wastewater treatment system is used to treat wastewater generated during the photovoltaic panel production process, mainly acidic and alkaline cleaning wastewater. Its process includes the following steps:

[0060] 1) Acidic and alkaline cleaning wastewater enter the collection tank for homogenization.

[0061] 2) Wastewater is pumped from the collection tank into the pre-sedimentation tank to remove suspended solids, colloids and other substances from the wastewater, and then enters the pH adjustment tank for pH adjustment.

[0062] 3) The effluent from the pH adjustment tank overflows into the intermediate water tank, then is pumped into a carbon filter and sand filter to remove suspended solids and oxidizing substances. It then enters the first-stage reverse osmosis unit for wastewater concentration and volume reduction. The concentrate from the first-stage reverse osmosis unit is rich in silicon and fluoride ions and enters the concentrate tank. The permeate from the first-stage reverse osmosis unit enters the permeate tank, which is equipped with a stirrer. Hydrochloric acid is added via a dosing device on the permeate tank to adjust the pH. After pH adjustment, the wastewater enters the second-stage reverse osmosis unit for water purification. The permeate from the second-stage reverse osmosis unit meets tap water standards and is reused in production. The concentrate from the second-stage reverse osmosis unit is returned to the intermediate water tank for further treatment.

[0063] 4) The concentrate from the primary reverse osmosis unit is rich in silicon and fluoride ions. It enters the primary reaction tank, where slaked lime is evenly added via a slaked lime dosing device. A mechanical agitator ensures a thorough reaction. After a 15-30 minute reaction retention time, it enters the secondary reaction tank, where calcium chloride is evenly added via a calcium chloride dosing device. A mechanical agitator ensures a thorough reaction. After a 15-30 minute reaction retention time, it enters the tertiary reaction tank, where flocculants and coagulants are evenly added via a flocculant / coagulant dosing device. A mechanical agitator ensures a thorough reaction. After a 5-15 minute reaction retention time, it is transferred to a sedimentation tank for sludge-water separation. The sludge is further processed in a plate and frame filter press, and the supernatant from the sedimentation tank is discharged after meeting standards.

[0064] The above specific implementation examples are used to explain and illustrate this utility model, and are only preferred embodiments of this utility model, not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made to this utility model within the spirit and scope of the claims shall fall within the protection scope of this utility model.

Claims

1. A photovoltaic panel production wastewater treatment system, characterized by: It includes a water collection tank, a pre-sedimentation tank, a pH adjustment unit, a filtration unit, a primary reverse osmosis unit, a secondary reverse osmosis unit, a reaction tank group, and a sedimentation tank; The outlet of the water collection tank is connected to the pre-sedimentation tank; The outlet of the pre-sedimentation tank is connected to the inlet of the filtration unit; The outlet of the filtration unit is connected to the inlet of the first-stage reverse osmosis device; The concentrate outlet of the first-stage reverse osmosis unit is connected to the reaction tank group; The outlet of the reaction tank group is connected to the sedimentation tank; The product water outlet of the first-stage reverse osmosis unit is connected to the inlet of the second-stage reverse osmosis unit.

2. The photovoltaic panel production wastewater treatment system according to claim 1, characterized in that: The photovoltaic panel production wastewater treatment system is also equipped with an intermediate water tank, a concentrated water tank, and a product water tank. The intermediate water tank is installed on the connecting pipe between the pH adjustment unit and the filtration unit; The concentrate tank is installed on the connecting pipeline between the first-stage reverse osmosis unit and the reaction tank group; The product water tank is installed on the connecting pipeline between the primary reverse osmosis unit and the secondary reverse osmosis unit.

3. The photovoltaic panel production wastewater treatment system of claim 2, wherein: The intermediate water tank is connected to the concentrate outlet of the secondary reverse osmosis unit.

4. The photovoltaic panel production wastewater treatment system according to claim 2, characterized in that: The water production tank is equipped with a hydrochloric acid dosing device.

5. The photovoltaic panel production wastewater treatment system according to claim 1, characterized in that: The pH adjustment unit is a pH adjustment tank.

6. The photovoltaic panel production wastewater treatment system according to claim 1, characterized in that: The filtration unit includes a carbon filter and a sand filter connected in sequence by pipes.

7. The photovoltaic panel production wastewater treatment system according to claim 1, characterized in that: The reaction tank group includes a primary reaction tank, a secondary reaction tank, and a tertiary reaction tank connected sequentially by pipelines. The primary reaction tank is equipped with a quicklime dosing device; The secondary reaction tank is equipped with a calcium chloride dosing device; The three-stage reaction tank is equipped with a flocculant / coagulant dosing device.

8. The photovoltaic panel production wastewater treatment system according to claim 7, characterized in that: Mechanical stirring devices are installed in the primary reaction tank, the secondary reaction tank, and the tertiary reaction tank.

9. The photovoltaic panel production wastewater treatment system according to claim 1, characterized in that: The photovoltaic panel production wastewater treatment system is also equipped with a sludge treatment device. The sludge treatment device is one of the following: plate and frame filter press, belt filter press, or centrifugal dewatering machine.

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