A processing system for machining wastewater

Abstract

This utility model discloses a treatment system for machining wastewater, relating to wastewater treatment technology. It includes an equalization tank, a flocculation tank, and a flotation tank, as well as a first anaerobic tank, a second anaerobic tank, an anaerobic tank, and a first oxidation tank. The first anaerobic tank is connected to the flotation tank. A constant-flow-rate circulating water path is provided between the first and second anaerobic tanks. The second anaerobic tank is connected to the anaerobic tank. A dynamic-flow-rate circulating water path is provided between the anaerobic tank and the first oxidation tank. The bacterial communities in the first, second, anaerobic, and first oxidation tanks are all located within the water circulation paths of the tanks. A sampler is provided on the outside of the first oxidation tank to control the flow rate of the dynamic-flow-rate circulating water path. This utility model employs water circulation in both the anaerobic and oxidation processes, which significantly improves the treatment speed of organic matter decomposition, thereby increasing the wastewater treatment capacity of the system.

Description

Technical Field

[0001] This utility model relates to wastewater treatment technology, and more specifically, to a treatment system for machining wastewater. Background Technology

[0002] The machining wastewater generated during the production and processing of vehicle parts such as flywheels mainly consists of cleaning wastewater and painting wastewater. This wastewater contains a significant amount of impurities and oil, thus requiring treatment before discharge. Current machining wastewater treatment processes involve adding flocculants to the wastewater and then sequentially passing it through air flotation, anaerobic digestion, and oxidation processes to achieve solid-liquid separation and organic matter decomposition, resulting in purified water. After sedimentation and separation of water and sludge, the water can be discharged. In existing technologies, the anaerobic and oxidation processes involve discharging wastewater from the previous process into anaerobic and oxidation tanks, where bacteria capture and decompose organic matter. The decomposition of organic matter generates gas, which agitates the water, preventing the organic matter from remaining statically suspended in a fixed position. However, this method involves passive water flow, which is not only slow, but also results in more pronounced stratification as the water remains in the pool for longer. This leads to uneven distribution of organic matter, poor decomposition efficiency, and ultimately excessively long anaerobic or oxidation time, making it difficult to improve the system's wastewater treatment capacity. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a machining wastewater treatment system that addresses the shortcomings of existing technologies, greatly improving the processing speed of organic matter decomposition and increasing the amount of wastewater that can be treated.

[0004] The present invention discloses a treatment system for machining wastewater, comprising an equalization tank, a flocculation tank, and a flotation tank, as well as a first anaerobic tank, a second anaerobic tank, an anaerobic tank, and a first oxidation tank. The first anaerobic tank is connected to the flotation tank, and a constant-flow-rate circulating water path is provided between the first anaerobic tank and the second anaerobic tank. The second anaerobic tank is connected to the anaerobic tank, and a dynamic-flow-rate circulating water path is provided between the anaerobic tank and the first oxidation tank. The bacterial communities in the first anaerobic tank, the second anaerobic tank, the anaerobic tank, and the first oxidation tank are all located in the water circulation path of the tank body. A sampler is provided on the outside of the first oxidation tank to control the flow rate of the dynamic-flow-rate circulating water path.

[0005] Preferably, the structure of the constant flow rate circulating water circuit is the same as that of the dynamic flow rate circulating water circuit, both including a circulating pump, an upper pumping pipe, an upper draining pipe, and a lower circulating pipe; the upper pumping pipe is installed at the pumping end of the circulating pump, the upper draining pipe is installed at the pumping end of the circulating pump, the upper pumping pipe and the upper draining pipe are respectively placed in one of the two pools, and the lower ends of the two pools are connected by the lower circulating pipe.

[0006] Preferably, the bottom of the first anaerobic tank, the second anaerobic tank, the facultative anaerobic tank, and the first oxidation tank are all provided with sludge accumulation sections.

[0007] Preferably, the sampler includes a water storage tank equipped with a water transparency sensor. The water storage tank is installed on the outer wall of the first oxidation tank. An inlet pipe is installed above the water storage tank. A T-connector is installed at the end of the inlet pipe. One end of the T-connector is connected to the first oxidation tank through a water intake pipe, and the other end of the T-connector is connected to an external water source through a clean water pipe. Both the water intake pipe and the clean water pipe are equipped with control valves. An outlet pipe is installed at the other end of the water storage tank. A control valve is installed in the outlet pipe, and the end of the outlet pipe is connected to the first oxidation tank.

[0008] Preferably, the connection between the water intake pipe and the first oxidation tank is located above the connection between the water outlet pipe and the first oxidation tank.

[0009] Preferably, an exhaust pipe is installed above the water storage tank, and a liquid level sensor is installed in the exhaust pipe. The liquid level sensor and the control valve of the water intake pipe are both electrically connected to a controller, which is also electrically connected to the circulating pump of the dynamic flow circulation water circuit.

[0010] Preferably, the treatment system also includes a second oxidation tank; the second oxidation tank is connected to the first oxidation tank.

[0011] Preferably, the treatment system also includes an inclined plate sedimentation tank and a carbon filter; the second oxidation tank, the inclined plate sedimentation tank and the carbon filter are connected in sequence.

[0012] Preferably, a pH adjustment tank and a temporary storage tank are provided between the flotation tank and the first anaerobic tank, and the flotation tank, pH adjustment tank, temporary storage tank and the first anaerobic tank are connected in sequence.

[0013] Beneficial effects The advantages of this utility model are: 1. Unlike the traditional static decomposition method, this invention uses water circulation in both the anaerobic and oxidation processes. This has the advantage of greatly increasing the decomposition speed of organic matter, thereby increasing the treatment capacity of the wastewater treatment system.

[0014] 2. This utility model adopts a treatment method that combines facultative anaerobic and oxidative processes. It can further reduce the organic matter that needs to be decomposed in the anaerobic wastewater that was not decomposed in the anaerobic treatment through facultative anaerobic treatment. At the same time, combined with the oxidation treatment in the first oxidation tank, it can perform preliminary decomposition of the organic matter in the wastewater that needs to be oxidized. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the processing system structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the anaerobic, facultative anaerobic, and oxidation tanks of the present invention. Figure 3 This is a schematic diagram of the water collector structure of the present invention.

[0016] Among them: 1-Grit chamber, 2-Equalization tank, 3-Flocculation tank, 4-Air flotation tank, 5-pH adjustment tank, 6-Temporary storage tank, 7-First anaerobic tank, 8-Second anaerobic tank, 9-Anoxic tank, 10-First oxidation tank, 11-Second oxidation tank, 12-Reaction tank, 13-Inclined plate sedimentation tank, 14-Carbon filter, 15-Sludge tank, 16-Dynamic flow circulating water circuit, 17-Constant flow circulating water circuit, 18-Water storage tank. 19-Water transparency sensor, 20-Inlet pipe, 21-T-connector, 22-Water intake pipe, 23-Control valve for water intake pipe, 24-Clear water pipe, 25-Control valve for clear water pipe, 26-Outlet pipe, 27-Control valve for outlet pipe, 28-Exhaust pipe, 29-Level sensor, 30-Sludge accumulation section, 171-Upper pumping pipe, 172-Circulation pump, 173-Upper drain pipe, 174-Circulation pipe. Detailed Implementation

[0017] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention. See Figure 1 The present invention provides a treatment system for machining wastewater, comprising a bar screen tank 1, an equalization tank 2, a flocculation tank 3, an air flotation tank 4, a first anaerobic tank 7, a second anaerobic tank 8, an anaerobic tank 9, a first oxidation tank 10, a second oxidation tank 11, an inclined plate sedimentation tank 13, a carbon filter tank 14, and a sludge tank 15.

[0018] After being filtered through the bar screen 1, the machining wastewater is sent to the equalization tank 2 for pH adjustment. Then, the wastewater is discharged into the flocculation tank 3. In the flocculation tank 3, flocculants such as PAM and PAC are added, causing fine pollutants in the wastewater to aggregate into larger particles, thus improving the efficiency of the subsequent air flotation process.

[0019] After the wastewater enters the dissolved air flotation (DAF) tank 4, the dissolved air flotation unit in tank 4 uses dissolved air water generated by the dissolved air system. This water undergoes rapid decompression and releases a large number of microbubbles. Some of these bubbles adhere to the surface of suspended solids or oils in the water, forming suspended solids with a total density of less than 1. These suspended solids rise to the surface due to buoyancy, thus separating the solids and liquids. This process also reduces BOD, COD, and color. After the DAF treatment is complete, the wastewater is fed into the pH adjustment tank 5 for further pH adjustment before proceeding with anaerobic treatment.

[0020] In this embodiment, a temporary storage tank 6 is provided between the pH adjustment tank 5 and the first anaerobic tank 7 to store wastewater.

[0021] Anaerobic tanks utilize the action of anaerobic bacteria to hydrolyze, acidify, and methanate organic matter, removing organic matter from wastewater and improving its biodegradability, which is beneficial for subsequent aerobic treatment. This embodiment has two anaerobic tanks: a first anaerobic tank 7 and a second anaerobic tank 8. The anaerobic bacteria are arranged in the middle of the tanks, ensuring they are all within the water circulation path. A constant-flow-rate circulating water path 17 is provided between the two anaerobic tanks. Wherein, as... Figure 2 As shown, the specific configuration of the constant flow rate circulating water path 17 is as follows: a circulating pump 172 and corresponding pipelines are installed at the top of the two anaerobic tanks. The uppermost water of the second anaerobic tank 8 is drawn from the upper pumping pipe 171 to the upper drain pipe 173, from which wastewater is discharged into the uppermost water of the first anaerobic tank 7. A lower circulating pipe 174 connects the two anaerobic tanks below their bacterial communities. This allows the water between the two anaerobic tanks to circulate after the circulating pump 172 is started. Furthermore, a sludge accumulation layer is installed at the bottom of the anaerobic tanks, separated from the upper space by a mesh screen, for accumulating sludge produced during the anaerobic reaction. The mesh screen is located below the circulating pump 172.

[0022] This invention employs a circulating flow between two anaerobic tanks for anaerobic wastewater treatment. This allows organic matter in the water to be better captured and decomposed by anaerobic bacteria through orderly flow. Compared to traditional anaerobic tanks where the flow of organic matter is solely influenced by gases generated from anaerobic decomposition, this invention offers superior and more efficient treatment. Specifically, machining wastewater typically requires 4-8 hours to treat in traditional anaerobic tanks, but the improved anaerobic treatment method described above ensures that even the largest volume of wastewater can be treated within 3 hours.

[0023] Preferably, after the water circulation in the anaerobic tank stops, the wastewater in both anaerobic tanks is allowed to stand for a predetermined first settling time period before being transported to the next process. The purpose of settling is to allow the precipitates generated during the anaerobic decomposition process to settle, reducing the impact of the precipitates on subsequent oxidation and decomposition.

[0024] The wastewater after anaerobic treatment will undergo oxidation treatment. Considering that the wastewater treated by the flow-type anaerobic system may still contain some organic matter that has not been completely anaerobic treated, this embodiment adds an anoxic tank 9 to the oxidation treatment, which has the ability to treat the wastewater both anaerobicly and oxidize it.

[0025] In this embodiment, the oxidation treatment employs a contact oxidation tank, in which packing material is placed within the oxidation tank to serve as a carrier for the biofilm. The wastewater to be treated, after being oxygenated, flows through the packing material at a certain flow rate, contacting the biofilm. The biofilm and suspended activated sludge work together to purify the wastewater.

[0026] To achieve water flow, this embodiment employs a dynamic flow circulation water path 16 between the anoxic tank 9 and the first oxidation tank 10. The specific structure of the dynamic flow circulation water path 16 is identical to that of the constant flow circulation water path 17. A circulation pump, an upper pumping pipe, and an upper draining pipe pump the upper water body of the first oxidation tank 10 to the upper water body of the anoxic tank 9. Meanwhile, the lower water body of the anoxic tank 9 returns wastewater to the first oxidation tank 10 via a lower circulation pipe.

[0027] In order to achieve dynamic adjustment of the water flow rate in the dynamic flow rate circulation water path 16, a sampler is set outside the first oxidation tank in this embodiment. Water samples are collected from the first oxidation tank 10 through the sampler, and the transparency value of the water in the sampler is detected. The flow rate of the dynamic flow rate circulation water path 16 is controlled based on the transparency value of the water.

[0028] As wastewater circulates in the anoxic tank 9 and the first oxidation tank 10, the water transparency will gradually increase. To allow the bacteria to better capture sufficient organic matter, the circulation velocity should also be increased. Initially, the wastewater can circulate at a set initial velocity in the anoxic tank 9 and the first oxidation tank 10. Assuming the initial circulation velocity is the velocity in the dynamic velocity circulation path 16, the corresponding power of the circulation pump should be P0. When the water transparency increases from TDS0 to TDS1, the corresponding circulation pump power P1 is obtained by looking up a table, and the circulation pump is controlled to operate at power P1, thus increasing the velocity in the dynamic velocity circulation path 16.

[0029] In the facultative and oxidative treatment of organic matter, using water transparency as the flow rate control condition of the circulating water path can better standardize water purification and improve the water treatment effect compared to a fixed treatment time cycle.

[0030] Furthermore, this embodiment uses water transparency as the cessation adjustment for water circulation in the anoxic tank 9 and the first oxidation tank 10. Specifically, when the water transparency reaches a set transparency threshold, water circulation between the anoxic tank 9 and the first oxidation tank 10 is stopped. At this point, the water in these two tanks can be discharged into the second oxidation tank 11. Figure 3As shown, in this embodiment, the sampler mainly includes a water storage tank 18 equipped with a water quality transparency sensor 19. The water storage tank 18 is installed on the outer wall of the first oxidation tank 10. An inlet pipe 20 is installed above the water storage tank 18, and a T-connector 21 is installed at the end of the inlet pipe 20. One end of the T-connector 21 is connected to the first oxidation tank 10 through a water intake pipe 22 for water intake, and the other end is connected to an external water source such as municipal water supply through a clean water pipe 24. Control valves are installed in both the water intake pipe 22 and the clean water pipe 24. An outlet pipe 26 is installed at the other end of the water storage tank 18. A control valve is also installed in this pipe. The end of the outlet pipe 26 is connected to the first oxidation tank 10, allowing the wastewater after testing or the water used to clean the sampler to flow back into the first oxidation tank 10.

[0031] After opening the control valve 23 of the water intake pipe, water in the first oxidation tank 10 will automatically flow into the storage tank 18. Once the storage tank 18 is full, the control valve is closed. Then, the water transparency signal is acquired by the water transparency sensor 19 and transmitted to the controller to control the circulation pump in the dynamic flow circulation path 16, thereby regulating the flow rate in the anoxic tank 9 and the first oxidation tank 10. After the water transparency signal is acquired, the control valve 27 of the outlet pipe is opened to empty the water in the storage tank 18. Next, the control valve 25 of the clean water pipe is opened to introduce clean water to clean the storage tank 18. After cleaning, the control valves 25 of the clean water pipe and 27 of the outlet pipe are closed sequentially.

[0032] The connection point between the water intake pipe 22 and the first oxidation tank 10 is located above the connection point between the water outlet pipe 26 and the first oxidation tank 10. This allows for easy water intake simply by opening the control valve in the water intake pipe, eliminating the need for pumping.

[0033] To achieve automatic water intake, an exhaust pipe 28 is installed above the water storage tank 18 in this embodiment. A liquid level sensor 29 is installed in the exhaust pipe 28. The liquid level sensor 29 and the control valve 23 of the water intake pipe are electrically connected to the controller. During water intake, gas in the water storage tank 18 is discharged through the exhaust pipe 28. When the water storage tank 18 is full, water will enter the exhaust pipe 28. When the water in the exhaust pipe 28 reaches the liquid level sensor 29, the liquid level sensor 29 sends a signal to the controller. The controller then controls the control valve 23 of the water intake pipe to close based on the signal, thereby stopping water intake. The liquid level sensor 29 must be installed above the connection between the water intake pipe 22 and the first oxidation tank 10. In addition, a perforated sealing plug can be installed above the exhaust pipe 28 to prevent foreign objects from entering the exhaust pipe.

[0034] To improve the purification of organic matter in the water, a second oxidation tank 11 is provided in this embodiment. The second oxidation tank 11 also contains packing material, which serves as a carrier for the biofilm. The difference is that wastewater from the first oxidation tank 10 is discharged into the lower part of the second oxidation tank 11, and after passing through the packing layer, overflows from the top of the second oxidation tank 11, without the need for wastewater settling.

[0035] Because the anaerobic and oxidation processes produce acidic substances, the wastewater discharged from the second oxidation tank 11 needs to be treated again in a reaction tank 12 to adjust the water quality before being transported to the inclined plate sedimentation tank 13. The inclined plates in the inclined plate sedimentation tank 13 are made of 45-degree honeycomb-shaped inclined tubes. The principle is that when wastewater flows upwards by gravity, it is deflected at a 45-degree angle as it passes through the inclined plate packing. Pollutants adhere to the inclined plate packing and fall off, while the clean water flows upwards by gravity, resulting in high pollutant removal efficiency. The main purpose of setting up the inclined plate sedimentation tank 13 here is to settle pollutants in the water overflowing from the second oxidation tank 10 and prevent clogging of the sand and carbon filter tank 14.

[0036] After sedimentation, the water is fed into the carbon filter 14. The carbon filter 14 can trap suspended solids in the water, remove iron, manganese, colloids, and silt, and reduce the turbidity of the water. It utilizes the well-developed fine pore structure and huge specific surface area of ​​activated carbon to adsorb the remaining metal ions in the water, and has a good removal effect on color and odor.

[0037] Sludge tank 15 is used to collect the sludge generated in the above-mentioned tanks, so as to facilitate centralized transportation and treatment.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present utility model. These modifications and improvements will not affect the effectiveness of the present utility model or the practicality of the patent.

Claims

1. A treatment system for machining wastewater, comprising an equalization tank (2), a flocculation tank (3), and an air flotation tank (4), characterized in that, It also includes a first anaerobic tank (7), a second anaerobic tank (8), an anaerobic tank (9), and a first oxidation tank (10); the first anaerobic tank (7) is connected to the flotation tank (4), a constant flow rate circulating water path (17) is provided between the first anaerobic tank (7) and the second anaerobic tank (8), the second anaerobic tank (8) is connected to the anaerobic tank (9), a dynamic flow rate circulating water path (16) is provided between the anaerobic tank (9) and the first oxidation tank (10), the bacterial communities in the first anaerobic tank (7), the second anaerobic tank (8), the anaerobic tank (9), and the first oxidation tank (10) are all set in the water circulation path of the tank body, and a sampler is provided on the outside of the first oxidation tank (10) for controlling the water flow rate of the dynamic flow rate circulating water path (16).

2. A system for treating machining wastewater according to claim 1, wherein The structure of the constant flow velocity circulating water channel (17) is the same as that of the dynamic flow velocity circulating water channel (16), both including a circulating pump (172), an upper pumping pipe (171), an upper drain pipe (173), and a lower circulating pipe (174); the upper pumping pipe (171) is installed at the pumping end of the circulating pump (172), the upper drain pipe (173) is installed at the outlet end of the circulating pump (172), the upper pumping pipe (171) and the upper drain pipe (173) are respectively placed in one of the two pools, and the lower ends of the two pools are connected by the lower circulating pipe (174).

3. A system for the treatment of machining wastewater according to claim 2, characterised in that, The bottom of the first anaerobic tank (7), the second anaerobic tank (8), the facultative anaerobic tank (9) and the first oxidation tank (10) are all provided with sludge accumulation sections (30).

4. The system for processing machining wastewater according to claim 1, wherein The sampler includes a water storage tank (18) equipped with a water quality transparency sensor (19). The water storage tank (18) is installed on the outer wall of the first oxidation tank (10). An inlet pipe (20) is installed above the water storage tank (18). A three-way connector (21) is installed at the end of the inlet pipe (20). One end of the three-way connector (21) is connected to the first oxidation tank (10) through a water intake pipe (22). The other end of the three-way connector (21) is connected to an external water source through a clean water pipe (24). A control valve is installed in both the water intake pipe (22) and the clean water pipe (24). An outlet pipe (26) is installed at the other end of the water storage tank (18). A control valve is installed in the outlet pipe (26). The end of the outlet pipe (26) is connected to the first oxidation tank (10).

5. A system for the treatment of machining wastewater according to claim 4, characterised in that, The connection between the water intake pipe (22) and the first oxidation tank (10) is located above the connection between the water outlet pipe (26) and the first oxidation tank (10).

6. The machining wastewater treatment system according to claim 4, characterized in that, An exhaust pipe (28) is installed above the water storage tank (18). A liquid level sensor (29) is installed in the exhaust pipe (28). The liquid level sensor (29) and the control valve (23) of the water intake pipe are both electrically connected to a controller. The controller is also electrically connected to the circulation pump of the dynamic flow circulation water circuit (16).

7. The system for processing machining wastewater according to claim 1, wherein The treatment system also includes a second oxidation tank (11); the second oxidation tank (11) is connected to the first oxidation tank (10).

8. A system for the treatment of machining wastewater according to claim 7, characterised in that, The treatment system also includes an inclined plate sedimentation tank (13) and a carbon filter (14); the second oxidation tank (11), the inclined plate sedimentation tank (13) and the carbon filter (14) are connected in sequence.

9. The system for processing machining wastewater according to claim 1, wherein A pH adjustment tank (5) and a temporary storage tank (6) are also provided between the flotation tank (4) and the first anaerobic tank (7), and the flotation tank (4), pH adjustment tank (5), temporary storage tank (6) and the first anaerobic tank (7) are connected in sequence.

Images