A waste liquid and waste residue purification and filtration device

Abstract

The utility model discloses a kind of waste liquid waste residue purification filtering devices, it is related to industrial wastewater treatment technical field, including the adjusting pool, air flotation pond, biochemical pool connected in turn, adjusting pool, the bottom of biochemical pool is connected with aeration system, air flotation pond is equipped with dissolved air system, air flotation pond is used to separate sludge and wastewater, the wastewater output end of air flotation pond is connected biochemical pool, the sludge output end of air flotation pond is connected with sludge pool, sludge pool is connected with plate-and-frame filter press, the wastewater output end of plate-and-frame filter press is connected with the input end of biochemical pool.Waste liquid is first adjusted in adjusting pool in acid-base, after waste liquid enters air flotation pond, air flotation pond generates tiny bubble by dissolved air system, promotes sludge to float into dross by adhering bubble, realizes mud-water separation, wastewater enters biochemical pool and is decomposed, sludge dross flows into sludge pool, sludge is filtered and extruded by plate-and-frame filter press, and blocky waste residue is produced, and the wastewater filtered by plate-and-frame filter press is transported back to biochemical pool and is decomposed again.

Description

Technical Field

[0001] This utility model relates to the field of industrial wastewater treatment technology, and in particular to a waste liquid and waste residue purification and filtration device. Background Technology

[0002] Large amounts of waste liquid and waste residue are generated daily in various industrial activities and some daily life scenarios. Solid-liquid separation is a crucial preliminary step in their treatment. Traditionally, natural sedimentation is often used to achieve solid-liquid separation, which simply involves placing the waste liquid and waste residue and waiting for the solids to settle due to gravity and the liquid to precipitate out. However, this method has significant drawbacks. On the one hand, it is very time-consuming, and its efficiency is extremely low when dealing with large-scale waste liquid and waste residue treatment needs, greatly affecting the overall treatment progress. On the other hand, the separation effect is far from ideal. Fine sludge particles and colloidal substances are difficult to completely separate from the wastewater through natural sedimentation, which greatly increases the difficulty of subsequent operations such as biological and physicochemical purification of wastewater, as well as sludge compaction and transportation. Utility Model Content

[0003] In order to improve the purification and filtration efficiency of waste liquid, this application provides a waste liquid and waste residue purification and filtration device.

[0004] The waste liquid and waste residue purification and filtration device provided in this application adopts the following technical solution: A waste liquid and waste residue purification and filtration device includes an equalization tank, an air flotation tank, and a biological treatment tank connected in sequence. The bottom of the equalization tank and the biological treatment tank are both connected to an aeration system. The air flotation tank is equipped with a dissolved air system and is used to separate sludge and wastewater. The wastewater output end of the air flotation tank is connected to the biological treatment tank, and the sludge output end of the air flotation tank is connected to a sludge tank. The sludge tank is connected to a plate and frame filter press, and the wastewater output end of the plate and frame filter press is connected to the input end of the biological treatment tank.

[0005] By adopting the above technical solution, the waste liquid is first adjusted for acidity and alkali in the equalization tank. After entering the dissolved air flotation tank, the dissolved air flotation tank generates microbubbles, which cause the sludge to adhere to the bubbles and float to the surface, forming scum, thus achieving sludge-water separation. The wastewater enters the biological treatment tank for decomposition treatment, while the sludge and scum flow into the sludge tank. The sludge is filtered and compressed by a plate and frame filter press, producing blocky waste residue. The wastewater filtered by the plate and frame filter press is transported back to the biological treatment tank for further decomposition treatment. The aeration system supplies oxygen to the equalization tank and the biological treatment tank, enabling the pollutants to be fully oxidized and providing oxygen for the microorganisms in the biological treatment tank to fully decompose the pollutants.

[0006] Optionally, the flotation tank includes a mixing tank, a sludge scraping tank, and a waste residue trough. The mixing tank and the sludge scraping tank are connected. The sludge scraping tank has an opening at its upper end and a discharge port on one side of the opening. The waste residue trough is located on one side of the discharge port and is connected to the sludge tank.

[0007] By adopting the above technical solution, the mixing tank fully mixes the waste liquid entering the flotation tank. The upper end of the scraper tank is open, and a discharge port is provided on one side of the opening. This discharge port provides a channel for the discharge of waste residue. The waste residue trough is located on one side of the discharge port. Its corresponding positional relationship with the discharge port allows the waste residue scraped out in the scraper tank to fall smoothly into the waste residue trough. The waste residue trough is connected to the sludge tank, thereby enabling the collection of waste residue to be transferred to the sludge tank.

[0008] Optionally, the dissolved air system includes an inlet pipe, a dissolved air pump, and an outlet pipe connected in sequence. The inlet pipe is connected to the sludge scraping tank, and the outlet pipe is connected to the sludge scraping tank and the waste residue tank.

[0009] By adopting the above technical solution, the inlet pipe draws water from the sludge scraping tank, the dissolved air pump dissolves the gas in the water, and the outlet pipe sends the dissolved air water back to the sludge scraping tank and the waste residue tank. The dissolved air system can generate a large number of fine bubbles, which can adsorb suspended impurities in the wastewater and promote the formation of scum, significantly enhancing the air flotation tank's ability to remove impurities, improving the clarity of the wastewater, and providing high-quality inlet conditions for subsequent stages.

[0010] Optionally, a scraper is provided above the scraper pool. The scraper includes a drive mechanism and a scraper. The drive mechanism drives the scraper to move closer to or further away from the discharge port at the opening of the scraper pool.

[0011] By adopting the above technical solution, the drive mechanism provides power so that the scraper can scrape the waste residue on the surface of the slag scraping tank to the discharge port, ensuring that the waste residue can be cleaned out of the slag scraping tank in a timely manner, avoiding the waste residue from remaining for a long time and affecting the normal working environment in the flotation tank, thereby ensuring that the separation function of the flotation tank can be continuously and effectively performed, and improving the operational stability of the entire device.

[0012] Optionally, the drive mechanism includes a motor, a drive shaft, and a driven shaft. Both the drive shaft and the driven shaft are equipped with sprockets, which are connected by a chain. The output end of the motor is connected to the rotating shaft of the drive shaft. The scraper is connected to the chain, and the scraper moves along the chain and circulates through the discharge port.

[0013] By adopting the above technical solution, the chain moves in a circular motion under the drive of the drive shaft, driven shaft and sprocket, and the scraper moves with the chain. The scraper will circulate along the chain past the discharge port. When the scraper moves along the chain, it circulates through the discharge port, which can discharge the waste residue from the discharge port at intervals. The scraper will not come into contact with other waste residue on the surface of the waste liquid during the return process, so that the waste residue maintains a one-way flow and collection on the surface of the waste liquid.

[0014] Optionally, a sensor is also provided above the sludge scraping tank, which is used to detect the liquid level height in the sludge scraping tank.

[0015] By adopting the above technical solution, the height of the liquid level in the sludge scraping tank can be obtained in real time, thereby monitoring the water level in the tank. When abnormal changes occur in the liquid level, operators can take appropriate measures to adjust the situation based on the liquid level information fed back by the sensors, ensuring that the sludge scraping tank is always at a suitable working liquid level, and controlling the sludge scraper to stop working when the liquid level is too high for scraping.

[0016] Optionally, the biological treatment tank includes an anoxic tank, an aerobic tank, and an MBR tank connected in sequence, and the wastewater output end of the plate and frame filter press is connected to the input end of the anoxic tank.

[0017] By adopting the above technical solutions, the anoxic tank provides a suitable environment for denitrification and other nitrogen removal reactions in wastewater, achieving the removal of nitrogen from the wastewater; the aerobic tank creates favorable living and reaction conditions for aerobic microorganisms, allowing them to fully decompose organic matter in the wastewater; the MBR tank, through membrane separation technology, further removes minute impurities from the pre-treated wastewater, improving the effluent quality. Furthermore, the wastewater output of the plate and frame filter press is connected to the input of the anoxic tank, allowing the wastewater treated by the plate and frame filter press to re-enter the anoxic tank and participate again in the deep purification process of the biological treatment tank.

[0018] Optionally, a clear water tank may also be included, with the clear water output end of the MBR tank connected to the clear water tank.

[0019] By adopting the above technical solution, after the MBR tank completes the wastewater treatment, the treated clean water will be transported to the clean water tank through its clean water output end. The clean water tank plays a role in buffering and collection. On the one hand, it can centrally store the clean water flowing in from the MBR tank, which is convenient for subsequent reuse or discharge in accordance with environmental protection requirements. On the other hand, the clean water tank can play a certain role in stabilizing the water quality of the final effluent, avoiding water quality fluctuations caused by factors such as instantaneous flow rate changes, and ensuring that the final discharged water always consistently meets the corresponding water quality standards.

[0020] Optionally, it also includes a dosing device, which is connected to the equalization tank, the flotation tank, and the clear water tank respectively.

[0021] By adopting the above technical solution, the dosing device can add chemicals to the equalization tank to adjust the pH of the waste liquid, and at the same time add chemical agents such as PAC, PAM and demulsifier to the flotation tank, and add disinfectant to the clear water tank for disinfection and sterilization, thereby further stabilizing the water quality.

[0022] Optionally, the inlet of the flotation tank is equipped with a flow regulating valve.

[0023] By adopting the above technical solution, the flow rate entering the flotation tank can be reasonably controlled by operating the flow regulating valve when the processing volume is large or small. This ensures that the dissolved air system, sludge scraping and other treatment operations in the flotation tank can be carried out under suitable operating conditions, preventing insufficient treatment due to excessive flow rate or affecting the overall processing efficiency of the device due to insufficient flow rate.

[0024] In summary, this application includes at least one of the following beneficial effects: 1. A scraper is installed above the scraper tank. The drive mechanism drives the scraper to circulate along the chain, systematically scraping away waste sludge as it passes the discharge port. This ensures that the waste sludge is discharged from the scraper tank in a timely and directional manner, preventing waste sludge accumulation from affecting the normal working environment of the flotation tank and maintaining its stable sludge-water separation function. Simultaneously, sensors installed above the scraper tank monitor the liquid level in real time, allowing operators to adjust accordingly and further ensuring the stable operation of the scraper and the entire flotation tank, thereby improving the reliability and stability of the entire system.

[0025] 2. The dissolved air flotation (DAF) tank utilizes a dissolved air system to achieve efficient separation of sludge and water. The biological treatment tank further purifies wastewater through a series of processes involving anoxic, aerobic, and MBR tanks. The clear water tank collects and buffers the treated water. Furthermore, the wastewater filtered by the plate and frame filter press can be returned to the biological treatment tank for further treatment, achieving water resource recycling. This comprehensively improves the purification efficiency of waste liquid and residue, ensuring that wastewater meets discharge standards and that waste residue is properly disposed of, effectively reducing resource waste and environmental pollution. Attached Figure Description

[0026] Figure 1 This is a process flow diagram of a waste liquid and waste residue purification and filtration device according to an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the overall structure of the slag scraping tank in the embodiments of this application.

[0028] Explanation of reference numerals in the attached figures: 1. Equalization tank; 2. Flotation tank; 21. Mixing tank; 22. Sludge scraping tank; 23. Waste residue trough; 24. Sludge scraper; 241. Scraper; 242. Motor; 243. Drive shaft; 244. Driven shaft; 245. Sprocket; 246. Chain; 247. Sensor; 3. Biological treatment tank; 31. Anoxic tank; 32. Aerobic tank; 33. MBR tank; 4. Aeration system; 5. Dissolved air system; 51. Inlet pipe; 52. Dissolved air pump; 53. Outlet pipe; 6. Sludge tank; 61. Plate and frame filter press; 7. Clear pool; 8. Dosing device; 9. Flow regulating valve. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0030] This application discloses a waste liquid and waste residue purification and filtration device. (Refer to...) Figure 1 and 2 The system comprises, in sequence, an equalization tank 1, a flotation tank 2, a biological treatment tank 3, and a clear water tank 7. Both the equalization tank 1 and the biological treatment tank 3 are connected to an aeration system 4 at their bottom. The wastewater output of the flotation tank 2 is connected to the biological treatment tank 3, and the sludge output of the flotation tank 2 is connected to a sludge tank 6. A plate and frame filter press 61 is connected to the sludge tank 6, and the wastewater output of the plate and frame filter press 61 is connected to the input of the biological treatment tank 3. The flotation tank 2 includes a mixing tank 21, a scraping tank 22, and a waste residue trough 23. The mixing tank 21 and the scraping tank 22 are connected. The scraping tank 22 has an opening at its upper end, and a discharge port is located on one side of the opening. The waste residue trough 23 is located on one side of the discharge port and connected to the outer wall of the scraping tank 22. The waste residue trough 23 is connected to the sludge tank 6. The plate and frame filter press 61 can press the waste residue in the sludge into blocks through filtration, and the filtered wastewater then enters the biological treatment tank 3 for further treatment.

[0031] Reference Figure 1 The dissolved air flotation tank 2 is connected to a dissolved air system 5, which includes an inlet pipe 51, a dissolved air pump 52, and an outlet pipe 53 connected in one connection. The inlet pipe 51 is connected to the sludge scraping tank 22, and the outlet pipe 53 is connected to the sludge scraping tank 22 and the waste residue tank 23. The inlet pipe 51 draws water from the sludge scraping tank 22, the dissolved air pump 52 dissolves gas in the water, and the outlet pipe 53 returns the dissolved air water to the sludge scraping tank 22 and the waste residue tank 23. The dissolved air system 5 can generate a large number of fine bubbles, which can adsorb suspended impurities in the wastewater and promote the formation of scum.

[0032] Reference Figure 2A scraper 24 is installed above the scraper tank 22. The scraper 24 includes a scraper 241, a motor 242, a drive shaft 243, and a driven shaft 244. The drive shaft 243 and the driven shaft 244 are arranged in parallel and above the scraper tank 22. The motor 242 drives the drive shaft 243 to rotate. Both the drive shaft 243 and the driven shaft 244 are fitted with sprockets 245. Specifically, the drive shaft 243 is located on the side away from the discharge port, and the driven shaft 244 is located above the discharge port. Both ends of the drive shaft 243 and the driven shaft 244 are fitted with sprockets 245. Two sprockets 245 at the same end are connected by a chain 246. The scraper 241 is detachably connected to the bracket. The two ends of the bracket are connected to the two chains 246 respectively. The scraper 241 moves in a circular motion between the two sprockets 245 with the chain 246 and circulates through the discharge port. When the scraper 241 is below the sprocket 245, it moves towards the discharge port. The scraper 241 can scrape away the waste sludge floating on the surface of the sludge tank 22 and carry it into the waste sludge trough 23. The waste sludge enters the sludge tank 6 along the waste sludge trough 23.

[0033] In a preferred embodiment, refer to Figure 2 The side wall of the slag scraper 22 at the discharge port is provided with an inclined surface. The inclined surface slopes downward from the outside of the slag scraper 22 inward, and the highest liquid level of the slag scraper 22 does not exceed the upper end of the inclined surface. Specifically, the scraper 241 is made of rubber. When the scraper 241 chain 246 moves to the discharge port, the bottom of the scraper 241 contacts the inclined surface, scraping the waste residue from the inclined surface to the waste residue trough 23 outside the slag scraper 22.

[0034] In a preferred embodiment, refer to Figure 1 and 2 A sensor 247 is also installed above the sludge scraping tank 22. The sensor 247 is used to detect the liquid level in the sludge scraping tank 22. The input end of the flotation tank 2 is equipped with a flow regulating valve 9. The sensor 247 detects the real-time liquid level in the sludge scraping tank 22, thereby controlling the flow rate entering the flotation tank 2 and thus controlling the total processing capacity of the entire purification device. If the flow rate entering the sludge scraping tank 22 is too large, the waste liquid will overflow from the discharge port into the waste residue tank 23, making it impossible to separate the waste residue from the waste liquid effectively. More waste residue will follow the waste liquid into the biological treatment tank 3, requiring the waste liquid to be circulated back to the flotation tank 2 for further treatment after being treated in the biological treatment tank 3, which will reduce the treatment efficiency. If the flow rate is too small, the liquid level will be insufficient, and the scraper 241 will not be able to scrape the waste residue off the surface of the sludge scraping tank 22.

[0035] In a preferred embodiment, refer to Figure 1The biological treatment tank 3 includes an anoxic tank 31, an aerobic tank 32, and an MBR tank 33 connected in sequence. Specifically, the wastewater output end of the plate and frame filter press 61 is connected to the input end of the anoxic tank 31, and the clear water output end of the MBR tank 33 is connected to the clear water tank 7. The wastewater is sequentially treated by decomposition in the anoxic tank 31 and the aerobic tank 32 before entering the MBR tank 33. The MBR tank 33 is equipped with a membrane bioreactor, and the wastewater passes through the membrane bioreactor to produce filtered clear water, which is then led to the clear water tank 7. The plate and frame filter press 61 filters the slurry in the sludge tank 6, producing filtered waste liquid and waste residue. The waste liquid is then reintroduced into the anoxic tank 31 for further treatment.

[0036] In a preferred embodiment, refer to Figure 1 It also includes a dosing device 8, which is connected to the equalization tank 1, the biological treatment tank 3 and the clear water tank 7 respectively. The dosing device 8 can add acid and alkali reagents to the equalization tank 1 to adjust the pH of the waste liquid, add reagents such as PAC, PAM and demulsifier to the flotation tank 2 to separate the waste residue in the waste liquid and form foam under the action of the dissolved air system 5, and add disinfectant to the clear water tank 7 for disinfection and sterilization.

[0037] The above are all preferred embodiments of this application. These embodiments are merely explanations of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waste liquid and waste residue purification and filtration device, characterized in that, The system includes an equalization tank (1), an air flotation tank (2), and a biological treatment tank (3) connected in sequence. The bottom of the equalization tank (1) and the biological treatment tank (3) are both connected to an aeration system (4). The air flotation tank (2) is equipped with a dissolved air system (5). The air flotation tank (2) is used to separate sludge and wastewater. The wastewater output end of the air flotation tank (2) is connected to the biological treatment tank (3). The sludge output end of the air flotation tank (2) is connected to a sludge tank (6). The sludge tank (6) is connected to a plate and frame filter press (61). The wastewater output end of the plate and frame filter press (61) is connected to the input end of the biological treatment tank (3).

2. The waste liquid and waste residue purification and filtration device according to claim 1, characterized in that: The flotation tank (2) includes a mixing tank (21), a sludge scraping tank (22), and a waste residue trough (23). The mixing tank (21) and the sludge scraping tank (22) are connected. The sludge scraping tank (22) has an opening at its upper end. A discharge port is provided on one side of the opening of the sludge scraping tank (22). The waste residue trough (23) is located on one side of the discharge port and is connected to the sludge tank (6).

3. The waste liquid and waste residue purification and filtration device according to claim 2, characterized in that: The dissolved air system (5) includes an inlet pipe (51), a dissolved air pump (52), and an outlet pipe (53) connected in sequence. The inlet pipe (51) is connected to the slag scraping tank (22), and the outlet pipe (53) is connected to the slag scraping tank (22) and the waste residue tank (23).

4. The waste liquid and waste residue purification and filtration device according to claim 2, characterized in that: A scraper (24) is provided above the scraper pool (22). The scraper (24) includes a drive mechanism and a scraper (241). The drive mechanism drives the scraper (241) to move closer to or further away from the discharge port at the opening of the scraper pool (22).

5. The waste liquid and waste residue purification and filtration device according to claim 4, characterized in that: The drive mechanism includes a motor (242), a drive shaft (243), and a driven shaft (244). Both the drive shaft (243) and the driven shaft (244) are equipped with sprockets (245), which are connected by a chain (246). The output end of the motor (242) is connected to the rotating shaft of the drive shaft (243). The scraper (241) is connected to the chain (246), and the scraper (241) moves along the chain (246) and circulates through the discharge port.

6. The waste liquid and waste residue purification and filtration device according to claim 4, characterized in that: A sensor (247) is also provided above the slag scraping tank (22), and the sensor (247) is used to detect the liquid level height in the slag scraping tank (22).

7. The waste liquid and waste residue purification and filtration device according to claim 1, characterized in that: The biochemical tank (3) includes an anoxic tank (31), an aerobic tank (32) and an MBR tank (33) connected in sequence, and the wastewater output end of the plate and frame filter press (61) is connected to the input end of the anoxic tank (31).

8. The waste liquid and waste residue purification and filtration device according to claim 7, characterized in that: It also includes a clear water tank (7), and the clear water output end of the MBR tank (33) is connected to the clear water tank (7).

9. A waste liquid and waste residue purification and filtration device according to claim 8, characterized in that: It also includes a dosing device (8), which is connected to the regulating tank (1), the biochemical tank (3), and the clear water tank (7) respectively.

10. A waste liquid and waste residue purification and filtration device according to claim 1, characterized in that: The air flotation tank (2) is equipped with a flow regulating valve (9) at its input end.

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