Zero discharge device for high-salt and high-ammonia-nitrogen wastewater

Abstract

The invention discloses a zero discharge device for high-salt and high-ammonia-nitrogen wastewater, and relates to the field of high-salt and high-ammonia-nitrogen wastewater treatment.The zero discharge device comprises an impurity treatment module, and the impurity treatment module conducts primary treatment on the high-salt and high-ammonia-nitrogen wastewater through an impurity settling tank; wherein a first chamber and a second chamber are arranged in the impurity depositing tank up and down, and the first chamber and the second chamber are communicated with each other; the first cavity and the second cavity are jointly and rotationally connected with a rotating shaft, and a first spiral conveying piece and a rotating plate are fixed to the outer side of the rotating shaft. By means of the device, the settling speed of impurities in wastewater can be increased, the treatment efficiency is improved, and compared with traditional single natural settling or single chemical settling, the settling speed is higher, the impurity removal degree is higher, and follow-up cleaning is convenient.

Description

Technical Field

[0001] The present invention relates to the field of high-salt and high-ammonia-nitrogen wastewater treatment, and particularly to a zero-discharge device for high-salt and high-ammonia-nitrogen wastewater. Background Art

[0002] High-salt and high-ammonia-nitrogen wastewater refers to wastewater with high concentrations of salts and ammonia nitrogen, mainly from industries such as electroplating, metallurgy, chemical engineering, and printing and dyeing. The treatment of this type of wastewater is a major challenge in the environmental protection water treatment industry because ammonia nitrogen is volatile in water and may be converted into toxic nitrite under anaerobic conditions.

[0003] The following process flow is adopted to effectively treat high-salt and high-ammonia-nitrogen wastewater: The pretreatment stage includes a regulating tank for preliminarily mixing and regulating the wastewater to stabilize the water quality and quantity, and sedimentation for removing suspended solids and part of the organic matter through physical sedimentation.

[0004] However, in the prior art, the physical natural sedimentation method takes a certain amount of time to complete, has low efficiency, and there are still some small particulate fixed impurities that cannot settle, resulting in incomplete sedimentation and the need for additional processes for further treatment.

[0005] Therefore, it is necessary to propose a zero-discharge device for high-salt and high-ammonia-nitrogen wastewater to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a zero-discharge device for high-salt and high-ammonia-nitrogen wastewater to solve the problems in the prior art that the physical natural sedimentation method takes a certain amount of time to complete, has low efficiency, and there are still some small particulate fixed impurities that cannot settle, resulting in incomplete sedimentation and the need for additional processes for further treatment.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A zero-discharge device for high-salt and high-ammonia-nitrogen wastewater, comprising:

[0008] An impurity treatment module, which uses an impurity precipitation tank to preliminarily treat high-salt and high-ammonia-nitrogen wastewater;

[0009] Wherein, a first chamber and a second chamber are arranged vertically inside the impurity precipitation tank, and the first chamber and the second chamber are interconnected;

[0010] And a rotating shaft is rotatably connected to the first chamber and the second chamber together, and a first spiral conveyor blade and a rotating plate are respectively fixed on the outer side of the rotating shaft;

[0011] The first spiral conveyor blade and the rotating plate are respectively arranged in the first chamber and the second chamber;

[0012] V-shaped grooves are formed on the upper and lower surfaces of the first spiral conveyor blade.

[0013] Preferably, a discharge port is provided on the outer side of the impurity precipitation tank, and the discharge port communicates with the inside of the second chamber;

[0014] A filter screen is provided at the connection between the discharge port and the second chamber, and a solenoid valve is provided inside the discharge port.

[0015] Preferably, two blanking pipes are connected to the bottom end of the second chamber, and crystallization pipes are spirally sleeved on the outer sides of the two blanking pipes.

[0016] Preferably, the rotating plate fits against the bottom end of the second chamber, and a scraper is fixedly connected to the end of the rotating plate, and the scraper fits against the inner wall of the second chamber.

[0017] Preferably, the bottom end of the impurity precipitation tank is provided with a conical end, and the conical end is connected with a conveying mechanism;

[0018] A connection channel is connected between the conveying mechanism and the conical end.

[0019] Preferably, the conveying mechanism includes a chassis, and a driving motor is fixed on one side of the top end of the chassis;

[0020] A conveying pipe is fixed on the other side of the top end of the chassis, a second spiral conveying sheet is rotatably arranged in the conveying pipe along the length direction, the driving shaft of the driving motor extends into the conveying pipe, and the second spiral conveying sheet is sleeved on the extending end of the driving shaft.

[0021] Preferably, a top cover is provided at the top end of the impurity precipitation tank;

[0022] A feed inlet is provided on the top cover, and the feed inlet communicates with the inside of the first chamber;

[0023] A flocculant inlet is also provided on the top cover, and a feed pipe communicates between the flocculant inlet and the second chamber.

[0024] Preferably, a plurality of support legs for support are fixedly connected to the outer side of the impurity precipitation tank.

[0025] Preferably, it further includes a biological denitrification unit, and the biological denitrification unit adopts an O / H / O process, and realizes the efficient removal of ammonia nitrogen in the wastewater through the alternating operation of aerobic, anoxic and anaerobic conditions;

[0026] A membrane separation unit, the membrane separation unit includes a nanofiltration system and a forward osmosis system, and the nanofiltration system is used to further concentrate the salts and ammonia nitrogen in the wastewater;

[0027] A crystallization unit: The crystallization unit performs cooling crystallization treatment on the high-salt wastewater concentrated by the membrane separation unit, so that the salts are precipitated in the form of crystals, and the recovery and utilization of salts are realized;

[0028] Reclaimed water treatment unit, which is used to treat the mother liquor and cooling water generated by the crystallization unit, remove the residual pollutants therein, make it meet the reclaimed water standard, and realize the recycling of water resources.

[0029] Preferably, in the crystallization unit, the cooling crystallization process adopts the freezing method, and the low-temperature crystallization of the wastewater is realized through the freezing crystallizer and the refrigeration unit, reducing energy consumption and improving the crystallization effect.

[0030] Technical effects and advantages of the present invention:

[0031] 1. In the actual operation of the present invention, after the wastewater enters the interior of the first chamber through the feed port, the impact force of the water flow will cause the first spiral conveyor to rotate, thereby slowing down the flow rate of the wastewater. At the same time, the first spiral conveyor will extend the flow path of the wastewater, increase the contact time with the V-shaped groove. When the wastewater flows, the wastewater will impact the V-shaped groove, and the fixed impurities in the wastewater will hit the V-shaped groove, so they will be blocked by the V-shaped groove and stay in the V-shaped groove to complete the interception of the initial impurities, while the liquid will continue to move and enter the second chamber.

[0032] 2. In the actual operation of the present invention, due to the impact of the wastewater, the first spiral conveyor and the rotating shaft rotate. The rotating shaft drives the rotating plate and the scraper to rotate in the second chamber at the same time. After the poured flocculant enters the second chamber, it can contact the wastewater. The rotation of the rotating plate can accelerate the mixing of the flocculant and the wastewater, make the mixing more uniform, and facilitate subsequent sedimentation.

[0033] 3. At the same time, the scraper can scrape off the large particle impurities adhering to the inner wall, avoid blockage, and there is no need for an additional driving mechanism to drive, reducing production costs. Moreover, the impact force of the wastewater makes the rotation amplitude of the rotating shaft smaller, preventing the rotating plate from rotating too fast and causing the sediment to be unable to settle.

[0034] 4. Through this device, the sedimentation speed of impurities in the wastewater can be accelerated, the treatment efficiency can be improved, and compared with the traditional single natural sedimentation or single chemical sedimentation, the sedimentation speed is faster, the impurity removal degree is higher, and the subsequent cleaning is more convenient.

[0035] 5. In the actual operation of the present invention, since the solid impurities still contain moisture, a freezing gas is input into the crystallization tube to freeze-crystallize the falling solid impurities, avoiding the adhesion of the impurities containing moisture in the feeding pipe or the internal of the conveying mechanism, and reducing the subsequent cleaning time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic external structure diagram of the impurity precipitation tank of the present invention.

[0037] Figure 2This is a schematic diagram of the internal structure of the impurity precipitation tank of the present invention.

[0038] Figure 3 This is a schematic diagram of the structure of the V-shaped groove of the present invention.

[0039] Figure 4 For the present invention Figure 1 The enlarged schematic diagram at position A in

[0040] Figure 5 This is a schematic diagram of the conveying mechanism of the present invention.

[0041] In the figure: 1. Impurity precipitation tank; 2. Top cover; 3. Support legs; 4. Conical end; 5. Underframe; 6. Conveying mechanism; 7. Conveying pipe; 8. Discharge port; 9. First chamber; 10. Second chamber; 11. Rotating shaft; 12. First spiral conveyor blade; 13. V-shaped groove; 14. Rotating plate; 15. Scraper; 16. Feed pipe; 17. Filter screen; 18. Feed pipe; 19. Crystallization pipe; 20. Feed inlet; 21. Flocculant inlet; 22. Driving motor; 23. Connection channel. Detailed implementation manners

[0042] The present invention provides a zero-discharge device for high-salt and high-ammonia-nitrogen wastewater as Figures 1 to 5 shown, including: an impurity treatment module, which uses the impurity precipitation tank 1 to preliminarily treat the high-salt and high-ammonia-nitrogen wastewater to remove large particulate suspensions and some impurities therein, so as to reduce the burden on subsequent treatment units.

[0043] A biological denitrification unit, which adopts the O / H / O process. Through the alternating operation of aerobic, anoxic and anaerobic conditions, it realizes the efficient removal of ammonia nitrogen in the wastewater, can significantly improve the ammonia nitrogen removal efficiency, and at the same time reduces energy consumption and operating costs.

[0044] And the reactors of the O / H / O process are connected by pipelines to realize the cyclic flow of wastewater and microorganisms, improving the denitrification efficiency.

[0045] A membrane separation unit, which includes a nanofiltration system and a forward osmosis system. The nanofiltration system is used to further concentrate the salts and ammonia nitrogen in the wastewater, helping to improve the recovery rates of salts and ammonia nitrogen, and at the same time reducing the burden on subsequent treatment.

[0046] A crystallization unit: The crystallization unit cools and crystallizes the high-salt wastewater concentrated by the membrane separation unit, so that the salts are precipitated in the form of crystals to realize the recycling of salts. In the crystallization unit, the cooling crystallization process adopts the freezing method, and the low-temperature crystallization of wastewater is realized through a freezing crystallizer and a refrigeration unit, reducing energy consumption and improving the crystallization effect.

[0047] The recycled water treatment unit is used to treat the mother liquor and cooling water generated by the crystallization unit, remove the residual pollutants therein, make it meet the recycled water standard, and realize the recycling of water resources.

[0048] Specifically, inside the impurity precipitation tank 1, a first chamber 9 and a second chamber 10 are arranged vertically. The first chamber 9 and the second chamber 10 are communicated with each other. The top of the impurity precipitation tank 1 is provided with a top cover 2. A feed inlet 20 is arranged on the top cover 2, and the feed inlet 20 is communicated with the inside of the first chamber 9. Wastewater can enter the inside of the first chamber 9 through the feed inlet 20.

[0049] Moreover, the first chamber 9 and the second chamber 10 are jointly rotatably connected with a rotating shaft 11. A first spiral conveyor blade 12 and a rotating plate 14 are respectively fixed on the outer side of the rotating shaft 11;

[0050] The first spiral conveyor blade 12 and the rotating plate 14 are respectively arranged in the first chamber 9 and the second chamber 10. V-shaped grooves 13 are formed on the upper and lower surfaces of the first spiral conveyor blade 12, and a plurality of V-shaped grooves 13 are formed. The openings of the V-shaped grooves 13 are arranged upward.

[0051] In the actual operation of the present invention, after the wastewater enters the inside of the first chamber 9 through the feed inlet 20, the impact force of the water flow will cause the first spiral conveyor blade 12 to rotate, thereby slowing down the flow rate of the wastewater. At the same time, the first spiral conveyor blade 12 will extend the flow path of the wastewater and increase the contact time with the V-shaped grooves 13. When the wastewater flows, the wastewater will impact the V-shaped grooves 13, and the fixed impurities in the wastewater will hit the V-shaped grooves 13, so they will be blocked by the V-shaped grooves 13 and stay in the V-shaped grooves 13 to complete the interception of the initial impurities, while the liquid will continue to move and enter the second chamber 10.

[0052] The rotating plate 14 fits against the bottom end of the second chamber 10, and a scraping plate 15 is fixedly connected to the end of the rotating plate 14. The scraping plate 15 fits against the inner wall of the second chamber 10.

[0053] A flocculant inlet 21 is also arranged on the top cover 2. A feeding pipe 16 is communicated between the flocculant inlet 21 and the second chamber 10. Flocculant can be poured into the flocculant inlet 21 so that the flocculant can enter the inside of the second chamber 10 and contact the wastewater, so that the smaller impurities in the wastewater can generate floc sedimentation.

[0054] In the actual operation of the present invention, due to the impact of the wastewater, the first spiral conveying sheet 12 and the rotating shaft 11 rotate. The rotating shaft 11 simultaneously drives the rotating plate 14 and the scraping plate 15 to rotate in the second chamber 10. After the poured flocculant enters the second chamber 10, it can come into contact with the wastewater. The rotation of the rotating plate 14 can accelerate the mixing of the flocculant and the wastewater, making the mixing more uniform and facilitating subsequent sedimentation. At the same time, the scraping plate 15 can scrape off the large particle impurities adhering to the inner wall to avoid blockage. No additional driving mechanism is required, reducing production costs. Moreover, the impact force of the wastewater makes the rotation amplitude of the rotating shaft 11 small, preventing the rotating plate 14 from rotating too fast, which may cause the sediment to be unable to settle.

[0055] Through this device, the sedimentation speed of impurities in the wastewater can be accelerated, the treatment efficiency can be improved, and compared with the traditional single natural sedimentation or single chemical sedimentation, the sedimentation speed is faster, the impurity removal degree is higher, and the subsequent cleaning is more convenient.

[0056] A discharge port 8 is arranged outside the impurity sedimentation tank 1. The discharge port 8 is communicated with the inside of the second chamber 10. A filter screen 17 is arranged at the connection between the discharge port 8 and the second chamber 10. A first electromagnetic valve is arranged inside the discharge port 8. The bottom end of the impurity sedimentation tank 1 is set as a conical end 4, and the conical end 4 is connected with a conveying mechanism 6;

[0057] Two feeding pipes 18 are connected to the bottom end of the second chamber 10. A crystallization pipe 19 is spirally sleeved outside the two feeding pipes 18. Second electromagnetic valves are arranged on both of the two feeding pipes 18.

[0058] At the same time, when the first electromagnetic valve is opened, the sediment is intercepted by the filter screen 17, while the liquid can be discharged through the discharge port 8. When the liquid is completely discharged, the first electromagnetic valve can be closed, and the second electromagnetic valve is opened, so that the fixed impurities can be discharged from the feeding pipe 18 and finally output by the conveying mechanism 6.

[0059] In the actual operation of the present invention, since the solid impurities still contain moisture, refrigerating gas is input into the crystallization pipe 19 to freeze-crystallize the falling solid impurities, preventing the impurities containing moisture from adhering to the inside of the feeding pipe 18 or the inside of the conveying mechanism 6 and reducing the subsequent cleaning time.

[0060] A connection channel 23 is connected between the conveying mechanism 6 and the conical end 4.

[0061] The conveying mechanism 6 includes a chassis 5, and a driving motor 22 is fixed on one side of the top end of the chassis 5;

[0062] On the other side of the top end of the chassis 5, a conveying pipe 7 is fixed. A second spiral conveying sheet is rotatably arranged in the conveying pipe 7 along the length direction. The driving shaft of the driving motor 22 extends into the conveying pipe 7, and the second spiral conveying sheet is sleeved on the extending end of the driving shaft.

[0063] The drive motor 22 can drive the second spiral conveyor sheet to rotate, thereby driving the impurities to be discharged.

[0064] A plurality of support legs 3 for support are fixedly connected to the outside of the impurity precipitation tank 1, and the support legs 3 can increase the height.

Claims

1. A zero-emission device for high-salt and high-ammonia-nitrogen wastewater, characterized in that: Including: An impurity treatment module, which preliminarily treats high-salt and high-ammonia-nitrogen wastewater by using an impurity precipitation tank (1); Among them, a first chamber (9) and a second chamber (10) are arranged up and down inside the impurity precipitation tank (1), and the first chamber (9) and the second chamber (10) are communicated with each other; Moreover, a rotating shaft (11) is rotatably connected to the first chamber (9) and the second chamber (10) together, and a first spiral conveyor blade (12) and a rotating plate (14) are respectively fixed on the outer side of the rotating shaft (11); The first spiral conveyor blade (12) and the rotating plate (14) are respectively arranged in the first chamber (9) and the second chamber (10); V-shaped grooves (13) are formed on the upper and lower surfaces of the first spiral conveyor blade (12).

2. The zero-discharge device for high-salt and high-ammonia-nitrogen wastewater according to claim 1, characterized in that: A discharge port (8) is arranged on the outer side of the impurity precipitation tank (1), and the discharge port (8) is communicated with the inside of the second chamber (10); A filter screen (17) is arranged at the connection between the discharge port (8) and the second chamber (10), and a first solenoid valve is arranged inside the discharge port (8).

3. The zero-discharge device for high-salt and high-ammonia-nitrogen wastewater according to claim 1, characterized in that: Two blanking pipes (18) are connected to the bottom end of the second chamber (10), and a crystallization pipe (19) is spirally sleeved on the outer sides of the two blanking pipes (18); Second solenoid valves are arranged on both of the two blanking pipes (18).

4. The zero-emission device for high-salt and high-ammonia-nitrogen wastewater according to claim 1, characterized in that: The rotating plate (14) is attached to the bottom end of the second chamber (10), and a scraping plate (15) is fixedly connected to the end of the rotating plate (14), and the scraping plate (15) is attached to the inner wall of the second chamber (10).

5. The zero-discharge device for high-salt and high-ammonia-nitrogen wastewater according to claim 1, characterized in that: The bottom end of the impurity precipitation tank (1) is set as a conical end (4), and the conical end (4) is connected with a conveying mechanism (6); A connection channel (23) is connected between the conveying mechanism (6) and the conical end (4).

6. The zero - discharge device for high - salt and high - ammonia - nitrogen wastewater according to claim 5, characterized in that: The conveying mechanism (6) includes a chassis (5), and a driving motor (22) is fixed on one side of the top end of the chassis (5); On the other side of the top end of the chassis (5), a conveying pipe (7) is fixed. A second spiral conveyor blade is rotatably arranged along the length direction inside the conveying pipe (7). The driving shaft of the driving motor (22) extends into the conveying pipe (7), and the second spiral conveyor blade is sleeved on the extending end of the driving shaft.

7. A zero-discharge device for high-salt and high-ammonia-nitrogen wastewater according to claim 1, characterized in that: A top cover (2) is arranged at the top end of the impurity precipitation tank (1); An inlet (20) is arranged on the top cover (2), and the inlet (20) is communicated with the inside of the first chamber (9); A flocculant inlet (21) is also arranged on the top cover (2), and a feeding pipe (16) is communicated between the flocculant inlet (21) and the second chamber (10).

8. The zero - discharge device for high - salt and high - ammonia - nitrogen wastewater according to claim 1, characterized in that: A plurality of supporting legs (3) for support are fixedly connected to the outer side of the impurity precipitation tank (1).

9. A zero-emission device for high-salt and high-ammonia-nitrogen wastewater according to claim 1, characterized in that: It also includes a biological denitrification unit, which adopts the O / H / O process and realizes the efficient removal of ammonia nitrogen in the wastewater through the alternating operation of aerobic, anoxic and anaerobic conditions; A membrane separation unit, which includes a nanofiltration system and a forward osmosis system. The nanofiltration system is used to further concentrate the salts and ammonia nitrogen in the wastewater; A crystallization unit: The crystallization unit cools and crystallizes the high-salt wastewater concentrated by the membrane separation unit, so that the salts are precipitated in the form of crystals to realize the recycling of salts; Reclaimed water treatment unit, which is used to treat the mother liquor and cooling water generated by the crystallization unit, remove the residual pollutants therein, make it meet the reclaimed water standard, and realize the recycling of water resources.

10. The zero-discharge device for high-salt and high-ammonia-nitrogen wastewater according to claim 9, characterized in that: In the crystallization unit, the cooling crystallization process adopts the freezing method, and the low-temperature crystallization of wastewater is realized through a freezing crystallizer and a refrigeration unit, reducing energy consumption and improving the crystallization effect.

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