Reinforced hardness removal treatment device for water reclamation plant

Abstract

The utility model relates to the technical field of sewage treatment, and discloses an enhanced hardness removal treatment device for a reclaimed water plant, which comprises a pH (potential of hydrogen) conditioning tank, a sodium hydroxide storage tank, a reaction tank, a water outlet pipe, a PAM (polyacrylamide) storage tank, a second sludge discharge pump, a sodium hydroxide dosing pump and a lifting pump, the other end of the first sodium hydroxide dosing pipe is installed at the input end of a sodium hydroxide dosing pump, the output end of the sodium hydroxide dosing pump is fixedly connected with a first sodium hydroxide communicating pipe, and a first water outlet groove is formed in one side of the top end of the pH conditioning pool. According to the device, the optimal pH environment for generating calcium carbonate and magnesium carbonate is met by adding sodium hydroxide, sodium carbonate is added into the reclaimed water, and calcium and magnesium ions in the sodium carbonate and the reclaimed water are rapidly mixed through the high-speed stirrer to form fine calcium carbonate and magnesium carbonate particles, so that the device is high in hardness removal efficiency, low in operation cost and safe and reliable in operation.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an enhanced hardness removal treatment device for a reclaimed water plant. Background Art

[0002] At present, many enterprises use tap water for industrial circulating cooling water. Therefore, reusing urban sewage for industrial circulating cooling water after regeneration is one of the effective ways to solve the shortage of water resources in my country. Most reclaimed water plants mainly use the qualified sewage treated by urban sewage treatment plants as raw water for secondary deep treatment. In the process of preparing industrial circulating cooling water, water evaporates continuously in the cooling tower. The calcium and magnesium ions in the water will form calcium carbonate and magnesium carbonate scale on the heat transfer surface of the heat exchanger, which will greatly reduce the heat transfer efficiency of the heat exchanger. Therefore, it is particularly important to remove the hardness of urban sewage reclaimed water used as industrial circulating water. At present, there are three main methods for removing the hardness of urban sewage reclaimed water used as industrial circulating water. The first is the lime coagulation method, which is to add calcium oxide and calcium hydroxide to the reclaimed water to form an insoluble calcium carbonate precipitate. Since the formation of calcium carbonate and magnesium carbonate precipitation needs to be carried out in an environment with a pH greater than 8, the effect of pH on the formation of calcium carbonate and magnesium carbonate precipitation is often ignored when using this method. Therefore, the precipitation often cannot form large particle precipitation, and many fine particles in a colloidal state remain in the water and cannot be removed. Since the reagent added in this method contains a large amount of calcium, the amount of salt mud produced will be greatly increased. Since this method often has poor stirring effect during the mixed reaction stage of reclaimed water and reagents, when the stirring rate is too high, the particles that have formed precipitation will be broken up. When the stirring rate is low, the reagent cannot be quickly and evenly dispersed into the entire reclaimed water, and the effect of precipitated material generation becomes worse. The second is the ion exchange method. The engineering cost and operation and maintenance cost of this method are extremely high, and the presence of organic matter will pollute the ion exchange resin. The third is the scale inhibitor addition method. This method can effectively prevent the formation of precipitation of calcium and magnesium ions in water, but this method does not essentially remove calcium and magnesium ions in water, and the price of scale inhibitors is relatively high, which greatly increases the operating cost. At the same time, improper use of scale inhibitors will cause secondary pollution to the environment. It can be seen that it is particularly important to develop a high-efficiency, low-operating-cost, and secondary-pollution-free hardness removal technology for urban sewage reclaimed water used as industrial circulating water. Therefore, technicians in this field propose a reclaimed water plant enhanced hardness removal treatment device to remove calcium and magnesium ions from reclaimed water. Utility Model Content

[0003] In order to make up for the above shortcomings, the utility model provides an enhanced hardness removal treatment device for a reclaimed water plant, which aims to improve the existing technology of using scale inhibitors to remove calcium and magnesium ions. The removal effect is still not ideal, and the price of scale inhibitors is relatively high, which greatly increases the operating cost. At the same time, improper use of scale inhibitors will cause secondary pollution to the environment.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a device for strengthening hardness removal in a reclaimed water plant, comprising a pH conditioning tank, a sodium hydroxide storage tank, a reaction tank, a water outlet pipe, a PAM storage tank, a second mud pump, a sodium hydroxide dosing pump and a lifting pump, wherein the bottom end of the sodium hydroxide storage tank is connected with a first sodium hydroxide dosing pipe, the other end of the first sodium hydroxide dosing pipe is installed at the input end of the sodium hydroxide dosing pump, the output end of the sodium hydroxide dosing pump is fixedly connected with a first sodium hydroxide connecting pipe, a first water outlet trough is provided on one side of the top end of the pH conditioning tank, the outside of the first water outlet trough is connected with the reaction tank through the water outlet pipe, the bottom end of the PAM storage tank is connected with a PAM dosing pipe, the other end of the PAM dosing pipe is fixedly connected to the input end of the PAM dosing pump end, the output end of the PAM dosing pump is fixedly connected with a second sodium carbonate connecting pipe, a strong stirring zone is arranged on one side of the interior of the reaction tank, a slow coagulation zone is arranged on the other side of the interior of the reaction tank, a second water outlet trough is opened outside the slow coagulation zone, the interior of the second water outlet trough is fixedly connected with a reaction tank outlet pipe, the other end of the reaction tank outlet pipe is connected with the interior of the inclined plate sedimentation tank, an inclined plate is installed inside the inclined plate sedimentation tank, a third water outlet trough is opened on one side outside the inclined plate sedimentation tank, the interior of the third water outlet trough is fixedly connected with an inclined plate sedimentation tank outlet pipe, the bottom end of the inclined plate sedimentation tank is connected with an inclined plate sedimentation tank mud discharge pipe, the other end of the inclined plate sedimentation tank mud discharge pipe is installed at the input end of the second mud discharge pump, and the output end of the second mud discharge pump is fixedly connected with a tenth valve.

[0005] As a further description of the above technical solution:

[0006] A first agitator is installed on the top of the pH conditioning tank, and a first steel-lined polytetrafluoroethylene impeller is fixedly connected to the output end of the first agitator. A pH meter is installed inside the pH conditioning tank. A second agitator is installed on the top of the reaction tank, and a multi-slurry steel-lined polytetrafluoroethylene impeller is fixedly connected to the output end of the second agitator. An isolation wall is fixedly connected to the inside of the reaction tank, and a water outlet is arranged inside the isolation wall.

[0007] As a further description of the above technical solution:

[0008] A third agitator is installed at the top of the reaction tank, and a second steel-lined polytetrafluoroethylene impeller is fixedly connected to the output end of the third agitator.

[0009] As a further description of the above technical solution:

[0010] The bottom end of the strong stirring zone is connected to the strong stirring zone mud discharge pipe, the bottom end of the slow coagulation zone is connected to the slow coagulation zone mud discharge pipe, the other end of the slow coagulation zone mud discharge pipe is connected to the reaction tank mud discharge pipe, and the reaction tank mud discharge pipe is fixedly connected to the input end of the first mud discharge pump.

[0011] As a further description of the above technical solution:

[0012] An eighth valve is installed outside the reaction tank mud discharge pipe, a seventh valve is installed outside the slow coagulation zone mud discharge pipe, the other end of the strong stirring zone mud discharge pipe is connected to the other end of the slow coagulation zone mud discharge pipe, and a sixth valve is installed outside the strong stirring zone mud discharge pipe.

[0013] As a further description of the above technical solution:

[0014] The other end of the second sodium carbonate connecting pipe is connected to the top of the reaction tank.

[0015] As a further description of the above technical solution:

[0016] The outside of the pH conditioning tank is connected to a water inlet pipe, a lift pump is installed outside the water inlet pipe, and a first valve is also installed outside the water inlet pipe.

[0017] As a further description of the above technical solution:

[0018] A first sodium carbonate connecting pipe is connected to one side of the top of the reaction tank, and an input end of the first sodium carbonate connecting pipe and an output end of the sodium carbonate dosing pump are fixedly connected to a second sodium hydroxide dosing pipe, and the other end of the second sodium hydroxide dosing pipe is fixedly connected to a first sodium carbonate storage tank.

[0019] As a further description of the above technical solution:

[0020] A fourth valve is installed on the outside of the second sodium hydroxide dosing pipe, a fifth valve is installed on the outside of the PAM dosing pipe, a third valve is installed on the outside of the outlet pipe, a ninth valve is installed on the outside of the reaction tank outlet pipe, an eleventh valve is installed on the outside of the inclined plate sedimentation tank outlet pipe, and a second valve is installed on the outside of the first sodium hydroxide dosing pipe.

[0021] The utility model has the following beneficial effects:

[0022] In the utility model, sodium carbonate is added to the reclaimed water by adding sodium hydroxide to meet the optimal pH environment for the generation of calcium carbonate and magnesium carbonate, and the sodium carbonate is quickly mixed with the calcium and magnesium ions in the reclaimed water by a high-speed agitator to form fine particles of calcium carbonate and magnesium carbonate. Then, in a slow stirring environment, the fine particles of calcium carbonate and magnesium carbonate can be fully coagulated and agglomerated by the added PAM to form large-particle precipitates, and the large-particle precipitates finally formed can be efficiently removed by an inclined plate sedimentation tank. The device can be installed near the outlet of a municipal sewage treatment plant, has high hardness removal efficiency, low operating cost, safe and reliable operation, and no secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a process flow chart of an enhanced hardness removal treatment device for a reclaimed water plant proposed by the utility model.

[0024] Legend:

[0025] 1. Water inlet pipe; 2. Lifting pump; 3. First valve; 4. pH conditioning tank; 5. First agitator; 6. First steel-lined PTFE impeller; 7. pH meter; 8. First water outlet tank; 9. Sodium hydroxide storage tank; 10. Sodium hydroxide dosing pump; 11. First sodium hydroxide dosing pipe; 12. Second valve; 13. Sodium hydroxide connecting pipe; 14. Third valve; 15. Water outlet pipe; 16. Reaction tank; 17. Isolation wall; 18. Strong stirring area; 19. Slow coagulation area; 20. Water outlet; 21. Second agitator; 22. Multi-slurry steel-lined PTFE impeller; 23. Third agitator; 24. Second steel-lined PTFE impeller; 25. Second water outlet tank; 26. First sodium carbonate storage tank; 27. Sodium carbonate dosing pump; 2 8. The second sodium hydroxide dosing pipe; 29. ​​The fourth valve; 30. The first sodium carbonate connecting pipe; 31. The PAM storage tank; 32. The PAM dosing pump; 33. The PAM dosing pipe; 34. The fifth valve; 35. The second sodium carbonate connecting pipe; 36. The mud discharge pipe of the strong stirring area; 37. The sixth valve; 38. The mud discharge pipe of the slow coagulation area; 39. The seventh valve; 40. The mud discharge pipe of the reaction tank; 41. The first mud discharge pump; 42. The eighth valve; 43. The outlet pipe of the reaction tank; 44. The ninth valve; 45. The inclined plate sedimentation tank; 46. The inclined plate; 47. The third outlet trough; 48. The mud discharge pipe of the inclined plate sedimentation tank; 49. The second mud discharge pump; 50. The tenth valve; 51. The outlet pipe of the inclined plate sedimentation tank; 52. The eleventh valve. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Reference Figure 1The utility model provides an embodiment: a device for strengthening hardness removal in a reclaimed water plant, comprising a pH conditioning tank 4, a sodium hydroxide storage tank 9, a reaction tank 16, a water outlet pipe 15, a PAM storage tank 31, a second mud pump 49, a sodium hydroxide dosing pump 10 and a lifting pump 2. The bottom end of the sodium hydroxide storage tank 9 is connected with a first sodium hydroxide dosing pipe 11, the other end of the first sodium hydroxide dosing pipe 11 is installed at the input end of the sodium hydroxide dosing pump 10, and the output end of the sodium hydroxide dosing pump 10 is fixedly connected with a first sodium hydroxide connecting pipe 13. A first water outlet trough 8 is provided on one side of the top of the pH conditioning tank 4. The outside of the first water outlet tank 8 is connected to the reaction tank 16 through the water outlet pipe 15. The first valve 3 is opened and the pH conditioning tank water inlet lifting pump 2 is started. The water to be treated will be sucked into the pH conditioning tank water inlet pipe 1 and finally flow into the pH conditioning tank 4 from the pH conditioning tank water inlet pipe 1. At this time, the second valve 12 is opened and the sodium hydroxide dosing pump 10 is started. When the liquid level of the pH conditioning tank 4 submerges the first steel-lined polytetrafluoroethylene impeller 6, the first agitator 5 is started, and then the flow rate of the sodium hydroxide dosing pump 10 is adjusted according to the pH meter 7. The specific dosage of the sodium carbonate solution is to control the pH of the pH conditioning tank at 8-8.5, in order to meet the optimal pH environment for the generation of calcium carbonate and magnesium carbonate, the bottom end of the PAM storage tank 31 is connected with a PAM dosing pipe 33, the other end of the PAM dosing pipe 33 is fixedly connected to the input end of the PAM dosing pump 32, the output end of the PAM dosing pump 32 is fixedly connected with a second sodium carbonate connecting pipe 35, a strong stirring zone 18 is arranged on one side of the reaction tank 16, a slow coagulation zone 19 is arranged on the other side of the reaction tank 16, a second water outlet trough 25 is provided outside the slow coagulation zone 19, the interior of the second water outlet trough 25 is fixedly connected with a reaction tank outlet pipe 43, the other end of the reaction tank outlet pipe 43 is connected with the interior of the inclined plate sedimentation tank 45, the flow rate of the PAM dosing pump 32 is adjusted, and the PAM solution in the PAM storage tank 31 will flow from the PAM dosing pipe 33 through the PAM connecting pipe 35 to the slow coagulation zone 19, and then in the slow stirring environment, the fine particles of calcium carbonate and magnesium carbonate can be fully coagulated by the added PAM , agglomeration, forming large particle sediments, the interior of the inclined plate sedimentation tank 45 is installed with an inclined plate 46, the outer side of the inclined plate sedimentation tank 45 is provided with a third water outlet trough 47, the interior of the third water outlet trough 47 is fixedly connected with an inclined plate sedimentation tank outlet pipe 51, the bottom end of the inclined plate sedimentation tank 45 is connected with an inclined plate sedimentation tank mud discharge pipe 48, the other end of the inclined plate sedimentation tank mud discharge pipe 48 is installed at the input end of a second mud discharge pump 49, the output end of the second mud discharge pump 49 is fixedly connected with a tenth valve 50, the slow The water to be treated in the coagulation zone 19 will flow from the second outlet tank 25 to the inclined plate sedimentation tank 45 by gravity through the outlet pipe 43 of the reaction tank. The wastewater to be treated enters from below the inclined plate 46 of the inclined plate sedimentation tank 45. When passing through the inclined plate 46, a certain speed is generated, so that the particulate matter in the wastewater is precipitated downward along the inclined plate 46. When salt mud begins to be generated at the bottom of the inclined plate sedimentation tank 45, the tenth valve 50 is opened, and the second mud discharge pump 49 is started at the same time, and the salt mud is discharged through the mud discharge pipe 48 of the inclined plate sedimentation tank. The water to be treated flows upward along the inclined plate 46. When the liquid level of the inclined plate sedimentation tank 45 submerges the inclined plate 46, the eleventh valve 52 is opened, and the regenerated water flows from the third outlet tank 47 to the outlet pipe 51 of the inclined plate sedimentation tank.

[0028] A first agitator 5 is installed on the top of the pH conditioning tank 4, and a first steel-lined polytetrafluoroethylene impeller 6 is fixedly connected to the output end of the first agitator 5. A pH meter 7 is installed inside the pH conditioning tank 4. A second agitator 21 is installed on the top of the reaction tank 16, and a multi-slurry steel-lined polytetrafluoroethylene impeller 22 is fixedly connected to the output end of the second agitator 21. An isolation wall 17 is fixedly connected to the inside of the reaction tank 16, and a water outlet 20 is arranged inside the isolation wall 17. The first agitator 5 is started, and the flow rate of the sodium hydroxide dosing pump 10 is adjusted according to the reading of the pH meter 7. The specific dosage of the sodium carbonate solution is such that the pH of the pH conditioning tank can be controlled at 8-8.5 to meet the optimal pH environment for the generation of calcium carbonate and magnesium carbonate.

[0029] A third agitator 23 is installed at the top of the reaction tank 16, and a second steel-lined polytetrafluoroethylene impeller 24 is fixedly connected to the output end of the third agitator 23. At the same time, the third agitator 23 and the fifth valve 34 are opened, and the PAM dosing pump 32 is started, and the flow rate of the PAM dosing pump 32 is adjusted, so that the PAM solution in the PAM storage tank 31 will flow from the PAM dosing pipe 33 through the PAM connecting pipe 35 to the slow coagulation zone 19, and then in the slow stirring environment, the fine particles of calcium carbonate and magnesium carbonate can be fully coagulated and agglomerated by the added PAM to form large particle precipitates.

[0030] The bottom end of the strong stirring zone 18 is connected to the strong stirring zone mud discharge pipe 36, the bottom end of the slow coagulation zone 19 is connected to the slow coagulation zone mud discharge pipe 38, the other end of the slow coagulation zone mud discharge pipe 38 is connected to the reaction tank mud discharge pipe 40, the reaction tank mud discharge pipe 40 is fixedly connected to the input end of the first mud discharge pump 41, and the salt mud is discharged through the strong stirring zone mud discharge pipe 36 and the reaction tank mud discharge pipe 40. The water to be treated in the strong stirring zone 18 flows into the slow coagulation zone 19 through the strong stirring zone water outlet 20 in the isolation wall 17.

[0031] The eighth valve 42 is installed outside the reaction tank mud discharge pipe 40, the seventh valve 39 is installed outside the slow coagulation zone mud discharge pipe 38, the other end of the strong stirring zone mud discharge pipe 36 is connected to the other end of the slow coagulation zone mud discharge pipe 38, and the sixth valve 37 is installed outside the strong stirring zone mud discharge pipe 36; the sixth valve 37 and the eighth valve 42 are opened, and the first mud discharge pump 41 is started at the same time, and the salt mud is discharged through the strong stirring zone mud discharge pipe 36 and the reaction tank mud discharge pipe 40. The water to be treated in the strong stirring zone 18 flows into the slow coagulation zone 19 through the strong stirring zone water outlet 20 in the isolation wall 17.

[0032] The other end of the second sodium carbonate connecting pipe 35 is connected to the top of the reaction tank 16 to facilitate the addition of sodium carbonate into the interior of the reaction tank 16 .

[0033] The outside of the pH conditioning tank 4 is connected to the water inlet pipe 1 , a lift pump 2 is installed outside the water inlet pipe 1 , and a first valve 3 is also installed outside the water inlet pipe 1 .

[0034] The top side of the reaction tank 16 is connected with a first sodium carbonate connecting pipe 30, and a fourth valve 29 is installed on the outside of the first sodium carbonate connecting pipe 30. The other end of the first sodium carbonate connecting pipe 30 is fixedly connected to the input end of the sodium carbonate dosing pump 27, and the output end of the sodium carbonate dosing pump 27 is fixedly connected to the second sodium hydroxide dosing pipe 28, and the other end of the second sodium hydroxide dosing pipe 28 is fixedly connected to the first sodium carbonate storage tank 26, and the fourth valve 29 is installed on the outside of the second sodium hydroxide dosing pipe 28. The PAM dosing pipe 33 is installed on the outside The fifth valve 34 is installed on the outside of the outlet pipe 15, the ninth valve 44 is installed on the outside of the outlet pipe 43 of the reaction tank, the eleventh valve 52 is installed on the outside of the outlet pipe 51 of the inclined plate sedimentation tank, and the second valve 12 is installed on the outside of the first sodium hydroxide dosing pipe 11. The sodium carbonate solution in the sodium carbonate storage tank 26 will flow from the sodium carbonate dosing pipe 28 to the strong stirring zone 18 through the sodium carbonate connecting pipe 30. The sodium carbonate and the calcium and magnesium ions in the reclaimed water are quickly mixed by the high-speed agitator to form fine particles of calcium carbonate and magnesium carbonate.

[0035] Working principle: When using this device, first open the first valve 3 and start the pH conditioning tank water inlet lifting pump 2. The water to be treated will be sucked into the pH conditioning tank water inlet pipe 1, and finally flow into the pH conditioning tank 4 from the pH conditioning tank water inlet pipe 1. At this time, open the second valve 12 and start the sodium hydroxide dosing pump 10. When the liquid level of the pH conditioning tank 4 submerges the first steel-lined polytetrafluoroethylene impeller 6, start the first agitator 5, and then adjust the flow rate of the sodium hydroxide dosing pump 10 according to the pH meter 7. The specific dosage of the sodium carbonate solution is to control the pH of the pH conditioning tank at 8-8.5 to meet the optimal pH environment for the generation of calcium carbonate and magnesium carbonate. The sodium hydroxide solution in the sodium hydroxide storage tank 9 will flow from the sodium hydroxide dosing pipe 11 through the sodium hydroxide connecting pipe 13 to the pH conditioning tank 4. After completing the pH conditioning process, open the third valve 14, and the water to be treated in the pH conditioning tank 4 will flow from the first outlet trough 8 through the pH conditioning tank outlet pipe 15 into the strong stirring zone 18 in the reaction tank 16 by gravity. When the liquid level in the strong stirring zone 18 submerges the lowest group of impellers of the multi-slurry steel-lined polytetrafluoroethylene impeller 22, open the second agitator 21 and the fourth valve 29 at the same time, and start the sodium carbonate dosing pump 27, adjust the flow rate of the sodium carbonate dosing pump 27, and the sodium carbonate solution in the sodium carbonate storage tank 26 will flow from the sodium carbonate dosing pipe 28 through the sodium carbonate connecting pipe 30 to the strong stirring zone 18. The sodium carbonate and the calcium and magnesium ions in the reclaimed water are quickly mixed by the high-speed agitator to form fine particles of calcium carbonate and magnesium carbonate. When salt mud begins to be generated at the bottom of the strong stirring zone 18, open the sixth valve 37 and the eighth valve 42, and start the first mud discharge pump 41 at the same time, and the salt mud is discharged through the strong stirring zone mud discharge pipe 36 and the reaction tank mud discharge pipe 40. The water to be treated in the strong stirring zone 18 flows into the slow coagulation zone 19 through the strong stirring zone outlet 20 in the isolation wall 17. When the liquid level in the slow coagulation zone 19 submerges the second steel-lined polytetrafluoroethylene impeller 24, the third agitator 23 and the fifth valve 34 are opened at the same time, and the PAM dosing pump 32 is started. The flow rate of the PAM dosing pump 32 is adjusted, and the PAM solution in the PAM storage tank 31 flows from the PAM dosing pipe 33 through the PAM connecting pipe 35 to the slow coagulation zone 19. Then, in the slow stirring environment, the fine particles of calcium carbonate and magnesium carbonate can be fully coagulated and agglomerated by the added PAM to form large particle sediments. When salt mud begins to be generated at the bottom of the slow coagulation zone 19, the seventh valve 39 and the eighth valve 42 are opened, and the first mud discharge pump 41 is started at the same time, and the salt mud is discharged through the slow coagulation zone mud discharge pipe 38 and the reaction tank mud discharge pipe 40.When the liquid level of the slow coagulation zone 19 submerges the second water outlet trough 25, the ninth valve 44 is opened, and the water to be treated in the slow coagulation zone 19 flows from the second water outlet trough 25 to the inclined plate sedimentation tank 45 by gravity through the reaction tank outlet pipe 43. The wastewater to be treated enters from below the inclined plate 46 in the inclined plate sedimentation tank 45, and generates a certain speed when passing through the inclined plate 46, so that the particulate matter in the wastewater settles downward along the inclined plate 46. When salt mud begins to be generated at the bottom of the inclined plate sedimentation tank 45, the tenth valve 50 is opened, and the second mud discharge pump 49 is started at the same time, and the salt mud is discharged through the mud discharge pipe 48 of the inclined plate sedimentation tank. The water to be treated flows upward along the inclined plate 46. When the liquid level of the inclined plate sedimentation tank 45 submerges the inclined plate 46, the eleventh valve 52 is opened, and the regenerated water flows from the third water outlet trough 47 to the outlet pipe 51 of the inclined plate sedimentation tank.

[0036] In this way, the quality of the recycled water produced can fully meet the "Standard for Reuse of Urban Wastewater for Industrial Circulating Cooling Water after Regeneration", and the device has high hardness removal efficiency, safe and reliable operation, low operating cost, and no secondary pollution.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for enhanced hardness removal in a reclaimed water plant, characterized in that: The invention comprises a pH conditioning tank (4), a sodium hydroxide storage tank (9), a reaction tank (16), a water outlet pipe (15), a PAM storage tank (31), a second mud discharge pump (49), a sodium hydroxide dosing pump (10) and a lifting pump (2), wherein the bottom end of the sodium hydroxide storage tank (9) is connected to a first sodium hydroxide dosing pipe (11), the other end of the first sodium hydroxide dosing pipe (11) is installed at the input end of the sodium hydroxide dosing pump (10), and the output end of the sodium hydroxide dosing pump (10) is fixed to the bottom end of the sodium hydroxide storage tank (9). A first sodium hydroxide connecting pipe (13) is fixedly connected to the pH conditioning tank (4); a first water outlet trough (8) is provided on one side of the top of the pH conditioning tank (4); the outside of the first water outlet trough (8) is connected to the reaction tank (16) through a water outlet pipe (15); the bottom end of the PAM storage tank (31) is connected to a PAM dosing pipe (33); the other end of the PAM dosing pipe (33) is fixedly connected to the input end of a PAM dosing pump (32); the output end of the PAM dosing pump (32) is fixedly connected to a second A sodium carbonate connecting pipe (35), a strong stirring zone (18) is arranged on one side of the interior of the reaction tank (16), a slow coagulation zone (19) is arranged on the other side of the interior of the reaction tank (16), a second water outlet trough (25) is provided outside the slow coagulation zone (19), a reaction tank water outlet pipe (43) is fixedly connected to the interior of the second water outlet trough (25), the other end of the reaction tank water outlet pipe (43) is connected to the interior of the inclined plate sedimentation tank (45), and the inclined plate sedimentation tank (45) is provided with a second water outlet trough (25). An inclined plate (46) is installed inside, and a third water outlet trough (47) is opened on one side of the outside of the inclined plate sedimentation tank (45). The inside of the third water outlet trough (47) is fixedly connected with an inclined plate sedimentation tank outlet pipe (51). The bottom end of the inclined plate sedimentation tank (45) is connected with an inclined plate sedimentation tank mud discharge pipe (48). The other end of the inclined plate sedimentation tank mud discharge pipe (48) is installed at the input end of a second mud discharge pump (49). The output end of the second mud discharge pump (49) is fixedly connected with a tenth valve (50).

2. The device for enhanced hardness removal in a reclaimed water plant according to claim 1, characterized in that: A first agitator (5) is installed on the top of the pH conditioning tank (4), and a first steel-lined polytetrafluoroethylene impeller (6) is fixedly connected to the output end of the first agitator (5). A pH meter (7) is installed inside the pH conditioning tank (4). A second agitator (21) is installed on the top of the reaction tank (16), and a multi-slurry steel-lined polytetrafluoroethylene impeller (22) is fixedly connected to the output end of the second agitator (21). An isolation wall (17) is fixedly connected to the inside of the reaction tank (16), and a water outlet (20) is arranged inside the isolation wall (17).

3. The device for enhanced hardness removal in a reclaimed water plant according to claim 1, characterized in that: A third agitator (23) is installed at the top of the reaction tank (16), and a second steel-lined polytetrafluoroethylene impeller (24) is fixedly connected to the output end of the third agitator (23).

4. The device for enhanced hardness removal in a reclaimed water plant according to claim 1, characterized in that: The bottom end of the strong stirring zone (18) is connected to a strong stirring zone mud discharge pipe (36), the bottom end of the slow coagulation zone (19) is connected to a slow coagulation zone mud discharge pipe (38), and the other end of the slow coagulation zone mud discharge pipe (38) is connected to a reaction tank mud discharge pipe (40), and the reaction tank mud discharge pipe (40) is fixedly connected to the input end of the first mud discharge pump (41).

5. The device for enhanced hardness removal in a reclaimed water plant according to claim 4, characterized in that: An eighth valve (42) is installed on the outside of the reaction tank mud discharge pipe (40), a seventh valve (39) is installed on the outside of the slow coagulation zone mud discharge pipe (38), the other end of the strong stirring zone mud discharge pipe (36) is connected to the other end of the slow coagulation zone mud discharge pipe (38), and a sixth valve (37) is installed on the outside of the strong stirring zone mud discharge pipe (36).

6. The device for enhanced hardness removal in a reclaimed water plant according to claim 1, characterized in that: The other end of the second sodium carbonate connecting pipe (35) is connected to the top of the reaction tank (16).

7. The device for enhanced hardness removal in a reclaimed water plant according to claim 1, characterized in that: The outside of the pH conditioning tank (4) is connected to the water inlet pipe (1), a lift pump (2) is installed outside the water inlet pipe (1), and a first valve (3) is also installed outside the water inlet pipe (1).

8. The device for enhanced hardness removal in a reclaimed water plant according to claim 1, characterized in that: A first sodium carbonate connecting pipe (30) is connected to one side of the top of the reaction tank (16); a fourth valve (29) is installed outside the first sodium carbonate connecting pipe (30); the other end of the first sodium carbonate connecting pipe (30) is fixedly connected to the input end of a sodium carbonate dosing pump (27); the output end of the sodium carbonate dosing pump (27) is fixedly connected to a second sodium hydroxide dosing pipe (28); the other end of the second sodium hydroxide dosing pipe (28) is fixedly connected to a first sodium carbonate storage tank (26).

9. The device for enhanced hardness removal in a reclaimed water plant according to claim 8, characterized in that: A fourth valve (29) is installed on the outside of the second sodium hydroxide dosing pipe (28), a fifth valve (34) is installed on the outside of the PAM dosing pipe (33), a third valve (14) is installed on the outside of the outlet pipe (15), a ninth valve (44) is installed on the outside of the reaction tank outlet pipe (43), an eleventh valve (52) is installed on the outside of the inclined plate sedimentation tank outlet pipe (51), and a second valve (12) is installed on the outside of the first sodium hydroxide dosing pipe (11).

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