Tail liquid softening and recycling device

Abstract

The utility model discloses a tail liquid softening and recycling device and relates to the technical field of sewage treatment. A dosing pipeline is arranged at the lower part of a water inlet of the mixing area, water enters the reaction area from the bottom of the mixing area, water enters the settling area from the upper part of the reaction area, an inclined plate and a rotary sludge scraper are arranged in the settling area, a sludge collecting pit is arranged in the settling area, a sludge suction cover is arranged in the sludge collecting pit, the sludge suction cover is connected with a sludge discharge pipe, the sludge discharge pipe is connected with an inlet of a screw pump, and the screw pump is connected with a plate-and-frame filter press. And a water outlet pipeline of the plate-and-frame filter press extends to a water inlet part of the settlement area. The device has the beneficial effects that a sodium carbonate solution is added into the mixing area by the dosing pipeline and reacts with calcium and magnesium ions in water to produce solid-phase calcium carbonate, magnesium carbonate and sodium chloride, the solid-phase calcium carbonate and magnesium carbonate are settled in the settling area, and supernate containing sodium chloride flows into the clear water tank to be recycled; the process can greatly reduce the backwashing water amount of softened water and the use amount of sodium chloride.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a device for softening and reusing tailings liquid. Background Technology

[0002] Water softening is a process that reduces the calcium and magnesium ion content in water by exchanging sodium chloride ions in the resin with calcium and magnesium ions in the water, thereby reducing the formation of scale. After a period of time, the softening resin tank needs to be backwashed and regenerated. The backwash water from the resin tank contains high levels of calcium and magnesium ions and can only be discharged, resulting in a waste of water resources. Utility Model Content

[0003] To address the problem of backwash water waste in existing softening water treatment processes, this invention provides a tail liquid softening and reuse device.

[0004] The technical solution provided by this utility model is: a tail liquid softening and reuse device, including a mixing zone, the mixing zone having a water inlet located at the top of the mixing zone, a dosing pipeline provided at the bottom of the mixing zone below the water inlet, water entering the reaction zone from the bottom of the mixing zone, a stirrer provided in the reaction zone, water entering the middle of the settling zone from the top of the reaction zone, an inclined plate provided at the top of the settling zone, a rotating sludge scraper provided at the bottom of the settling zone, and the supernatant above the inclined plate entering the clear water tank;

[0005] The settling zone has a sludge collection pit at the bottom of the rotating sludge scraper. A sludge suction hood is installed in the sludge collection pit. The sludge suction hood is connected to a sludge discharge pipe, which is connected to the inlet of a screw pump. The outlet of the screw pump has a pipe connected to the inlet of a plate and frame filter press. The outlet pipe of the plate and frame filter press extends to the inlet of the settling zone.

[0006] The sludge suction hood includes a cup-shaped hood with its opening facing downwards. The sludge discharge pipe is tangentially connected to the wall of the cup-shaped hood, and a rotatable spiral impeller is installed inside the cup-shaped hood.

[0007] The top of the cup-shaped cover has an umbrella-shaped cap structure. The mud discharge pipe is connected to a flared mouth, which is connected to the cup-shaped cover. The larger diameter end of the flared mouth is connected to the cup-shaped cover.

[0008] The beneficial effects of this utility model are as follows: Sodium carbonate solution is added to the mixing zone through the dosing pipeline, which reacts with calcium and magnesium ions in the water to produce solid calcium carbonate, magnesium carbonate and sodium chloride. The solid calcium carbonate and magnesium carbonate settle in the settling zone, and the supernatant containing sodium chloride flows to the clear water tank for reuse. This process can greatly reduce the backwash water volume of softened water and the amount of sodium chloride used. The screw pump sends the sludge in the sludge collection pit to the plate and frame filter press, which separates it into water and dry sludge. The effluent from the plate and frame filter press contains a certain amount of fine sludge, which flows back to the front end to participate in the settling again. Attached Figure Description

[0009] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 is a structural schematic view of the mud suction cover in the utility model; Figure 2 Figure 3 is a structural schematic view of the A-A section of the mud suction cover in the utility model;

[0011] Figure 4 is a structural schematic view of the B-B section of the mud suction cover in the utility model; Figure 3 Figure 5 is a structural schematic view of the C-C section of the mud suction cover in the utility model. Figure 2 Figure 6 is a structural schematic view of the D-D section of the mud suction cover in the utility model.

[0012] In the figure, 1 is a reaction zone, 2 is a mixing zone, 3 is a sedimentation zone, 4 is a clean water pool, 5 is a rotary mud scraper, 6 is an inclined plate, 7 is a mud collecting pit, 8 is a mud suction cover, 9 is a mud discharge pipe, 10 is a screw pump, 11 is a plate-and-frame filter press, 12 is a water inlet, 13 is a dosing pipeline, 14 is a cup-shaped cover, 15 is a spiral impeller, 16 is a trumpet mouth, and 17 is an umbrella-shaped cap. DETAILED DESCRIPTION

[0013] As shown in the figure, the tail liquid softening and recycling device comprises a mixing zone 2, the mixing zone 2 is provided with a water inlet 12 at the upper portion of the mixing zone 2, the mixing zone 2 is provided with a dosing pipeline 13 at the lower portion of the water inlet 12, water enters a reaction zone 1 from the bottom of the mixing zone 2, the reaction zone 1 is provided with a stirrer, water enters the middle of a sedimentation zone 3 from the upper portion of the reaction zone 1, the sedimentation zone 3 is provided with an inclined plate 6 at the upper portion, the sedimentation zone 3 is provided with a rotary mud scraper 5 at the lower portion, and the supernatant at the upper portion of the inclined plate 6 enters a clean water pool 4. Figures 1 to 3 The sedimentation zone 3 is provided with a mud collecting pit 7 at the bottom of the rotary mud scraper 5, the mud collecting pit 7 is provided with a mud suction cover 8, the mud suction cover 8 is connected with a mud discharge pipe 9, the mud discharge pipe 9 is connected with the inlet of a screw pump 10, the outlet of the screw pump 10 is provided with a pipeline connecting the inlet of a plate-and-frame filter press 11, and the water outlet pipeline of the plate-and-frame filter press 11 extends to the water inlet position of the sedimentation zone 3.

[0014] The dosing pipeline 13 adds sodium carbonate solution into the mixing zone 2, reacts with calcium and magnesium ions in the water to produce solid-phase calcium carbonate, magnesium carbonate and sodium chloride, the solid-phase calcium carbonate and magnesium carbonate are settled in the sedimentation zone 3, the supernatant containing sodium chloride flows to the clean water pool 4 for recycling, the process can greatly reduce the backwash water volume of the softened water and the sodium chloride consumption, the screw pump 10 sends the sludge in the mud collecting pit 7 into the plate-and-frame filter press 11, separates the sludge into water and dry sludge, the water outlet of the plate-and-frame filter press 11 contains a certain amount of fine sludge, and the fine sludge is returned to the front end of the sedimentation zone 3 to participate in the settlement again.

[0015] The mud suction cover 8 comprises a cup-shaped cover 14, the cup-shaped cover 14 is arranged with the opening downward, the mud discharge pipe 9 is tangentially connected to the wall of the cup-shaped cover 14, and the cup-shaped cover 14 is provided with a spiral impeller 15 which can rotate.

[0016] The mud suction cover 8 comprises a cup-shaped cover 14, the cup-shaped cover 14 is arranged with the opening downward, the mud discharge pipe 9 is tangentially connected to the wall of the cup-shaped cover 14, and the cup-shaped cover 14 is provided with a spiral impeller 15 which can rotate.

[0017] The mud suction cover 8 comprises a cup-shaped cover 14, the cup-shaped cover 14 is arranged with the opening downward, the mud discharge pipe 9 is tangentially connected to the wall of the cup-shaped cover 14, and the cup-shaped cover 14 is provided with a spiral impeller 15 which can rotate.When the screw pump 10 pumps sludge, the sludge liquid flows from the tangential direction in the cup-shaped cover 14, driving the spiral impeller 15 to rotate, which stirs the lower sludge into the cup-shaped cover 14, preventing the sludge in the sludge collecting pit 7 from being blocked. Once the sludge in the sludge collecting pit 7 is blocked, the screw pump 10 can be opened in reverse direction, and the sludge in the sludge discharge pipe 9 drives the spiral impeller 15 to rotate in reverse direction, stirring the sludge.

[0018] The top of the cup-shaped cover 14 is an umbrella-shaped cap 17 structure, which is beneficial to the downward flow of sludge. The sludge discharge pipe 9 is connected with a horn mouth 16, the horn mouth 16 is connected with the cup-shaped cover 14, the large-diameter end of the horn mouth 16 is connected with the cup-shaped cover 14, and the sludge suction area is increased.

Claims

1. A tail liquid softening and recycling device comprising a mixing zone (2), characterized in that: The mixing zone (2) has a water inlet (12) located at the upper part of the mixing zone (2), and a dosing pipeline (13) is arranged at the lower part of the water inlet (12); water enters the reaction zone (1) from the bottom of the mixing zone (2); the reaction zone (1) is provided with a stirrer; water enters the middle part of the sedimentation zone (3) from the upper part of the reaction zone (1); the upper part of the sedimentation zone (3) is provided with an inclined plate (6); the lower part of the sedimentation zone (3) is provided with a rotary mud scraper (5); the supernatant at the upper part of the inclined plate (6) enters the clean water tank (4); The sedimentation zone (3) is provided with a mud collecting pit (7) at the bottom of the rotary mud scraper (5); the mud collecting pit (7) is provided with a mud suction cover (8); the mud suction cover (8) is connected with a mud discharge pipe (9); the mud discharge pipe (9) is connected with the inlet of a screw pump (10); the outlet of the screw pump (10) is connected with the inlet of a plate-and-frame filter press (11) through a pipeline; the water outlet pipeline of the plate-and-frame filter press (11) extends to the water inlet part of the sedimentation zone (3).

2. The tail liquid softening and recycling device according to claim 1, characterized in that: The mud suction cover (8) comprises a cup-shaped cover (14); the cup-shaped cover (14) is arranged with an opening downward; the mud discharge pipe (9) is tangentially connected to the wall of the cup-shaped cover (14); and a rotatable spiral impeller (15) is arranged in the cup-shaped cover (14). The top of the cup-shaped cover (14) is in the structure of an umbrella-shaped cap (17); the mud discharge pipe (9) is connected with a horn mouth (16); the horn mouth (16) is connected with the cup-shaped cover (14); and the large-diameter end of the horn mouth (16) is connected with the cup-shaped cover (14).

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