A novel granulation fluidized bed integrating multiple functions

Abstract

This invention discloses a novel multifunctional granulation fluidized bed device, comprising, from top to bottom, a clear water zone, a separation zone, a sedimentation zone, and a sludge collection zone. An inclined plate is positioned above the clear water zone, above which is a water collection zone. Filter tanks are located at both ends of the water collection zone, with an outlet at the bottom of one filter tank. An inner cylinder is located within the sedimentation zone, forming a fluidized zone. Inlet pipes and chemical inlet pipes are located on both sides of the sedimentation zone, and a baffle plate is located at the bottom of the fluidized zone. Baffles are positioned on both sides of the fluidized bed at the boundary between the clear water zone and the separation zone. A seed inlet is located on one side of the separation zone. The sludge collection zone is located at the conical bottom of the fluidized bed and includes a reducing pipe with a gate at the top and a switchable filter at the bottom. The switchable filter is connected to a drain pipe. The treated water meets the standards for direct reuse, significantly optimizing the wastewater pretreatment process, reducing labor intensity, and improving work efficiency.

Description

Technical Field

[0001] This invention relates to a granulation fluidized bed process, and more particularly to a novel granulation fluidized bed that integrates multiple functions. Technical Background

[0002] The control of existing fluidized beds is relatively complex, and materials are prone to backmixing; the operation is inflexible and the operating conditions cannot be changed too much, which puts higher demands on the control system; the collision mode of particles in the fluidized bed is highly random, resulting in a loose floc structure and low density; the cost of existing fluidized bed technology is relatively high and it needs to be used in conjunction with other equipment to complete the wastewater treatment. Summary of the Invention

[0003] This application proposes a novel granulation fluidized bed device that integrates multiple functions, realizing the reaction zone, separation zone, sludge concentration zone and clarification zone in one unit. Compared with conventional fluidized beds, this device has the ability to treat complex water quality and is easy to operate. The treated water quality can meet the standard for direct reuse, significantly optimizing the wastewater pretreatment process, saving power plant area, enhancing automation, reducing labor intensity and improving work efficiency.

[0004] This application is achieved through the following technical solution:

[0005] A novel granulation fluidized bed device integrating multiple functions includes a clear water zone, a separation zone, a sedimentation zone and a sludge collection zone distributed from top to bottom. Several inclined plates are set above the clear water zone, and the water collection zone is above the inclined plates. Filter tanks are set at both ends of the water collection zone, and an outlet is set below the filter tank at one end.

[0006] The settling zone is equipped with an inner cylinder, and a fluidization zone is formed inside the inner cylinder. Water inlet pipes and chemical inlet pipes are respectively installed on both sides of the settling zone, and a baffle is installed at the bottom of the fluidization zone.

[0007] Baffles are installed on both sides of the fluidized bed at the boundary between the clear water zone and the separation zone; a seed inlet is installed on one side of the separation zone.

[0008] The sediment collection zone is located at the conical bottom of the fluidized bed. A reducer is installed in the sediment collection zone, with a gate at the top and a switch-on filter at the bottom; the switch-on filter connects to the discharge pipe. The reducer effectively reduces the water content of the sludge in the sediment collection zone. The gate at the top of the reducer controls the discharge of fluidized bed particles and water. The switch-on filter at the bottom effectively filters calcium carbonate and magnesium hydroxide crystals. Water flows out through the discharge pipe, while the calcium carbonate and magnesium hydroxide crystals are trapped in the reducer. Closing the gate and opening the switch-on filter allows the calcium carbonate and magnesium hydroxide crystals to be discharged.

[0009] Furthermore, sea sand is placed inside the filter tank. Water flowing through the inclined plate enters the water collection area and then enters the filter tank through the pipes at both ends of the water collection area. The sea sand placed inside the filter tank filters the water in the water collection area, turning it into cleaner water, which then flows out through the outlet.

[0010] Furthermore, the inclined plate forms a 60-degree angle with the horizontal, causing impurities in the rising clear water to settle in the inclined plate. As the water flows upward along the inclined plate, the separated impurities slide down the inclined plate to the bottom under the action of gravity, and enter the sedimentation zone after passing through the centrifugal force generated in the separation zone.

[0011] Furthermore, the baffles are tilted downwards, and the length and angle (20~70 degrees) of the baffles are adjusted according to the water flow effect. This design effectively prevents the rising flocculated particles from entering the clear water zone, allowing them to gradually settle in the sedimentation zone. On the other hand, it can guide the impurities that settle down from the inclined plate into the separation zone, and then into the sedimentation zone through the centrifugal force generated in the separation zone.

[0012] Furthermore, the water inlet and the chemical inlet are arranged alternately, with the chemical inlet at a 60-degree angle to the horizontal and the water inlet at a 30-degree angle to the horizontal, in opposite directions. This alternating arrangement serves two purposes: first, it enhances the mixing effect between the chemical solution and the water flow; second, the specific angle of water inlet causes the water flow to spiral upward within the fluidized bed cylinder, generating a certain centrifugal force in the separation zone. The flocculent particles formed by the combination of the chemical solution and ions in the water enter the sedimentation zone under the action of centrifugal force.

[0013] Furthermore, the bottom of the inner cylinder is conical.

[0014] Furthermore, the baffle is a smooth disc-shaped, horizontally placed baffle with gaps between it and the two side walls of the inner cylinder. It is located at the interface between the fluidization zone and the settling zone. This can increase the path of water flow into the fluidization zone and prevent large suspended particles from re-entering the fluidization zone, thereby causing large flocculent particles to settle down.

[0015] The wastewater treatment process using the above-mentioned device includes the following steps:

[0016] (1) The water from the wastewater tank or buffer tank is pumped to the fluidized bed inlet pipe. At the same time, sodium hydroxide and sodium carbonate solutions are added to the fluidized bed through the inlet pipe in proportion. When the water rises to the separation zone, the flocculated particles move to the bottom of the baffle plate under the action of centrifugal force. The water with flocculated particles enters the settling zone through the baffle plate.

[0017] (2) In an intermittent manner, seed crystals are added to the fluidized bed. The CaCO3 / Mg(OH)2 crystals generated in the water flow adhere to the surface of the seed crystals and precipitate, and then enter the sedimentation zone. The unsettled flocculent particles will circulate in the fluidized bed with the water flow. After being guided by the baffle plate, the water flow enters the fluidized zone to re-participate in the circulation. The flocculent particles continuously circulate and reach dynamic equilibrium.

[0018] (3) The sediment entering the sedimentation area is controlled to enter the reducer; the gate is opened to control the flocculated particles to enter the reducer with the water flow. The water flows out through the drain pipe after being filtered by the switch filter screen. Calcium carbonate and magnesium hydroxide crystal particles are blocked on the switch filter screen of the reducer; then the gate is closed and the switch filter screen is opened to discharge the calcium carbonate and magnesium hydroxide crystal particles.

[0019] (4) The relatively clear water in the separation zone enters the clear water zone. The impurities in the rising clear water settle in the inclined plate. The separated impurities slide down the inclined plate to the bottom under the action of gravity and enter the sedimentation zone after passing through the separation zone. The water flowing through the inclined plate enters the water collection zone and enters the filter tank through the pipes at both ends of the water collection zone. The water in the water collection zone is filtered by sea sand and becomes cleaner clear water, which is discharged through the outlet.

[0020] Furthermore, the particle size of the sea sand in the filter tank is 0.25~0.35mm.

[0021] Furthermore, in step (1), the velocity of the rising water flow is 60 m / h to 120 m / h.

[0022] Advantages of the present invention

[0023] 1. This granulation fluidized bed integrates multiple process flows into one, with a short process flow and high wastewater treatment efficiency.

[0024] 2. This granulation fluidized bed equipment has a small footprint, a high degree of automation, and is easy to operate.

[0025] 3. This granulation fluidized bed can treat complex water qualities, including both municipal wastewater and industrial circulating wastewater.

[0026] 4. The alternating arrangement of the water inlet and the drug inlet in this granulation fluidized bed serves two purposes: firstly, it enhances the mixing effect between the drug solution and the water flow; secondly, the specific angle of the water inlet causes the water flow to spiral upward within the fluidized bed cylinder, generating a certain centrifugal force in the separation zone. The flocculent particles formed by the combination of the drug solution and ions in the water enter the sedimentation zone under the action of centrifugal force.

[0027] 5. Calcium carbonate and magnesium hydroxide crystal particles can be discharged separately from wastewater, simplifying the process and improving work efficiency. Attached Figure Description

[0028] Figure 1This is a schematic diagram of a granulation fluidized bed.

[0029] Figure 2 Layout diagram of water inlet and chemical inlet (AA cross-sectional view);

[0030] In the diagram: 1. Water collection area; 2. Filter tank; 3. Sea sand; 4. Outlet; 5. Inclined plate; 6. Clear water area; 7. Separation area; 8. Inner cylinder; 9. Settling area; 10. Inlet pipe; 11. Baffle plate; 12. Sediment collection area; 13. Gate; 14. Reducer; 15. Switch filter screen; 16. Sewage pipe; 17. Chemical inlet pipe; 18. Fluidization zone; 19. Seed crystal inlet; 20. Baffle plate. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention and to make the above-mentioned objectives, features and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to embodiments.

[0032] Example 1

[0033] A novel granulation fluidized bed device integrating multiple functions includes a clear water zone 6, a separation zone 7, a sedimentation zone 9 and a silt collection zone 12 distributed from top to bottom. Several inclined plates 5 at a 60-degree angle to the horizontal are set above the clear water zone. The water collection zone 1 is above the inclined plates 5. Filter tanks 2 are set at both ends of the water collection zone 1. Sea sand 3 is placed in the filter tanks 2. A water outlet 4 is set below the filter tank at one end.

[0034] The settling zone is housed within a conical inner cylinder 8, which forms a fluidized bed 18. Water inlet pipes 10 and chemical inlet pipes 17 are located on either side of the settling zone, with the inlets and outlets alternating. The chemical inlet is at a 60-degree angle to the horizontal, while the water inlet is at a 30-degree angle, and their directions are opposite. A baffle plate 11, a smooth, disc-shaped, horizontally placed baffle plate 11 with gaps between it and the side walls of the inner cylinder 8, is located at the interface between the fluidized bed and the settling zone. Downward-sloping baffle plates 20 are located on both sides of the fluidized bed, at the boundary between the clear water zone and the separation zone. A seed inlet 19 is located on one side of the separation zone 7. A sediment collection zone 12 is located at the conical bottom of the fluidized bed. A reducer pipe 14 is installed in the sediment collection zone 12, with a gate 13 at the top and a switch filter 15 at the bottom. The switch filter 15 is connected to a drain pipe 16.

[0035] Methods for treating wastewater:

[0036] Wastewater from wastewater tanks or buffer tanks is pumped to the fluidized bed inlet pipe. Simultaneously, sodium hydroxide and sodium carbonate solutions are added to the fluidized bed in proportion via the chemical inlet pipe. The fluidized bed inlets and chemical inlets are arranged alternately, with the chemical inlet at a 60-degree angle to the horizontal and the water inlet at a 30-degree angle to the horizontal, in opposite directions. Figure 2As shown. This novel influent method allows wastewater and chemicals entering the fluidization zone to spiral upwards under the influence of water flow velocity. When the water flows up to the separation zone, centrifugal force causes the flocculated particles to move below the baffles. The baffles prevent the flocculated particles from entering the clear water zone, and the water carrying the flocculated particles passes through the baffles and enters the settling zone. The treated seed crystals are added to the sulfurized bed. The seed crystals can be added intermittently, with a dosage of approximately 25-50 kg / d. The CaCO3 / Mg(OH)2 crystals generated in the water flow adhere to the surface of the treated seed crystals, causing aggregation, and then enter the sedimentation zone. The unsettled flocculated particles circulate within the sulfurized bed with the water flow. Guided by the baffles, the water flows back into the fluidization zone to re-enter the circulation, and the flocculated particles continuously circulate and reach dynamic equilibrium. The baffle plate, shaped like a smooth disc, is located at the interface between the fluidization and settling zones and is placed horizontally. This increases the path of water flow into the fluidization zone, thus causing large flocculent particles to settle. Settled material entering the sedimentation zone is controlled to enter a reducer. A gate is installed at the top of the reducer, and a switch filter is installed at the bottom. Opening the gate controls the flocculent particles to enter the reducer with the water flow. The water flows out through the drain pipe after being filtered by the switch filter, while calcium carbonate and magnesium hydroxide crystals are blocked by the switch filter. Subsequently, closing the gate and opening the switch filter allows the calcium carbonate and magnesium hydroxide crystals to be discharged. The calcium carbonate crystals in the sediment have a particle size of 2-3 mm and a calcium carbonate content of 70-90%. The size of the calcium carbonate crystals can be controlled by controlling the water flow velocity, generally limited to an upward flow velocity of 60 m / h to 120 m / h.

[0037] The relatively clear water flows from the separation zone into the clear water zone. Multiple smooth inclined plates at a 60-degree angle to the horizontal are installed above the clear water zone. This causes impurities in the rising clear water to settle in the inclined plates. The separated impurities slide down the inclined plates under gravity and, after passing through the centrifugal force generated in the separation zone, enter the settling zone. The water flowing through the inclined plates enters the collection zone and then flows into the filter tank through pipes at both ends of the collection zone. Sea sand is placed in the filter tank, filtering the water in the collection zone into cleaner clear water, which is then discharged through the outlet. (See attached image.) Figure 1 As shown, the sea sand in the filter tank has a particle size between 0.25 and 0.35 mm, which effectively filters the water flow.

Claims

1. A multifunctional granulation fluidized bed device, comprising, from top to bottom, a clear water zone (6), a separation zone (7), a sedimentation zone (9), and a sludge collection zone (12), characterized in that, Several inclined plates (5) are set above the clear water area. The water collection area (1) is above the inclined plates (5). Filter tanks (2) are set at both ends of the water collection area (1). Water outlet (4) is set below the filter tank at one end. An inner cylinder (8) is installed inside the settling zone, and a fluidized zone (18) is formed inside the inner cylinder (8). A water inlet pipe (10) and a chemical inlet pipe (17) are respectively installed on both sides of the settling zone, and a baffle plate (11) is installed at the bottom of the fluidized zone. The baffles (20) on both sides of the fluidized bed are located at the junction of the clear water zone and the separation zone; the seed inlet (19) is provided on one side of the separation zone (7); the baffles (20) are inclined downwards and the angle of the baffles is 20~70°; The sediment collection area (12) is located at the bottom of the fluidized bed cone. A reducing pipe (14) is installed in the sediment collection area (12). A gate (13) is installed at the top of the reducing pipe (14), and a switch filter (15) is installed at the bottom. The switch filter (15) is connected to the sewage pipe (16). The inclined plate (5) forms a 60-degree angle with the horizontal. The water inlet and the chemical inlet are arranged alternately, with the chemical inlet at a 60-degree angle to the horizontal and the water inlet at a 30-degree angle to the horizontal, and in opposite directions; The baffle (11) is a smooth disc, placed horizontally, with gaps between it and the two side walls of the inner cylinder (8).

2. The granulation fluidized bed device integrating multiple functions according to claim 1, characterized in that, Sea sand (3) is placed in the filter tank (2).

3. The granulation fluidized bed device integrating multiple functions according to claim 1, characterized in that, The bottom of the inner cylinder (8) is conical.

4. A wastewater treatment process utilizing the granulation fluidized bed apparatus according to any one of claims 1-3, characterized in that, (1) The water from the wastewater tank or buffer tank is pumped to the fluidized bed inlet pipe. At the same time, sodium hydroxide and sodium carbonate solutions are added to the fluidized bed through the inlet pipe in proportion. When the water rises to the separation zone, the flocculated particles move to the bottom of the baffle plate under the action of centrifugal force. The water with flocculated particles enters the settling zone through the baffle plate. (2) In an intermittent manner, seed crystals are added to the fluidized bed. The CaCO3 / Mg(OH)2 crystals generated in the water flow adhere to the surface of the seed crystals and precipitate, and then enter the sedimentation zone. The unsettled flocculent particles will circulate in the fluidized bed with the water flow. After being guided by the baffle plate, the water flow enters the fluidized zone to re-participate in the circulation. The flocculent particles continuously circulate and reach dynamic equilibrium. (3) Settlement entering the sedimentation area is controlled to enter the variable diameter pipe; Opening the gate controls the flocculated particles to enter the reducer pipe with the water flow. The water flows out through the drain pipe after being filtered by the switch filter screen. Calcium carbonate and magnesium hydroxide crystal particles are blocked on the switch filter screen of the reducer pipe. Then, closing the gate and opening the switch filter screen can discharge the calcium carbonate and magnesium hydroxide crystal particles. (4) The relatively clear water in the separation zone enters the clear water zone. The impurities in the rising clear water settle in the inclined plate. The separated impurities slide down the inclined plate to the bottom under the action of gravity and enter the sedimentation zone after passing through the separation zone. The water flowing through the inclined plate enters the water collection zone and enters the filter tank through the pipes at both ends of the water collection zone. The water in the water collection zone is filtered by sea sand and becomes cleaner clear water, which is discharged through the outlet.

5. The wastewater treatment process according to claim 4, characterized in that, The particle size of the sea sand in the filter tank is 0.25~0.35mm.

6. The wastewater treatment process according to claim 4, characterized in that, The flow velocity of the rising water in step (1) is 60m / h~120m / h.

Images