A kind of bead fluidization reaction sewage treatment process

Abstract

This application relates to the field of wastewater treatment technology, and in particular to a crystal bead fluidized bed reaction wastewater treatment process, comprising the following steps: 1) Wastewater enters a crystal bead fluidized bed tower, and contacts a precipitant under air lift to generate small particle precipitates; 2) The small particle precipitates combine with seed crystals to form preliminary crystal beads, which continuously fluidize and circulate in the crystal bead fluidization zone to form mature crystal beads; 3) The mature crystal bead precipitates accumulate at the bottom of the crystal bead fluidized bed tower and are discharged from the crystal bead collection port; the wastewater passes through a clarification zone and is discharged from the effluent outlet; a) The water discharged from the crystal bead fluidized bed tower mixes with a coagulant to form a small floc mixture; b) The small floc mixture enters a high-efficiency separation tower, contacts a flocculant, and circulates and fluidizes under air lift until large flocs are large enough to settle at the bottom of the high-efficiency separation tower; c) The large flocs are discharged from the sludge discharge port at the bottom of the high-efficiency separation tower, and then mix with the wastewater and re-enter the crystal bead fluidized bed tower. The sludge discharge is small, and the wastewater treatment equipment occupies a small area.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a crystal bead fluidized reaction wastewater treatment process. Background Technology

[0002] For wastewater containing one or more of the following pollutants: high hardness, high silicon, high fluoride, high phosphorus, and heavy metals, a series of treatments are carried out to reduce the content of pollutants in the water as much as possible and meet the effluent requirements.

[0003] Chinese patent application number 201810496242.2 discloses a method and apparatus for removing hardness from high-hardness wastewater, including the following steps: (1) First, the wastewater is passed sequentially through a primary coagulation tank, a secondary coagulation tank, and a circulating clarification tank for primary sedimentation treatment to remove most of the hardness of the wastewater, where most of the hardness refers to temporary hardness and some permanent hardness; (2) Then, the wastewater after primary sedimentation treatment is passed through a high-efficiency sedimentation tank that integrates a coagulation zone, a flocculation zone, and a sedimentation-concentration zone for secondary clarification treatment to remove the permanent hardness of the wastewater. The conventional treatment method is to use a primary sedimentation method + a secondary sedimentation method. The sedimentation process can usually be a high-efficiency sedimentation tank, a loading sedimentation tank, etc. The basic removal principle is chemical precipitation reaction. When a two-stage sedimentation method is used, the following problems will exist.

[0004] The applicant believes that although the above-mentioned related technologies have solved the technical problem that the hardness treatment effect of existing wastewater hardness treatment methods is not ideal, they have the following defects: (1) Two-stage sedimentation occupies a large area, which is difficult to arrange for sites with limited space; (2) The amount of sludge is relatively large. Due to the large content of pollutants, the sludge production will be relatively large and can only be treated as hazardous waste; (3) The amount of chemicals added is relatively large, and the treatment cost is relatively high. Summary of the Invention

[0005] In order to reduce the footprint of wastewater treatment equipment, reduce sludge discharge, and reduce chemical dosage, this application provides a crystal bead fluidized reaction wastewater treatment process.

[0006] A fluidized bed reactor wastewater treatment process using crystal beads employs the following technical solution.

[0007] A fluidized bed reactor wastewater treatment process includes the following steps:

[0008] S1. Bead fluidization:

[0009] 1) Wastewater enters the crystal bead fluidized tower and comes into contact with the precipitant in the crystal bead fluidization zone under the action of air stripping. The precipitant reacts with the pollutants in the wastewater to generate small particulate precipitates.

[0010] 2) The generated small particle precipitates combine with the seed crystals to begin forming the prototype of crystal beads. Through the continuous entry of raw water and gas, the prototype crystal beads are suspended in the crystal bead fluidization zone. Then, they continuously come into contact with and are continuously wrapped by the newly formed small particle precipitates. The crystal beads are continuously fluidized and circulated in the crystal bead fluidization zone until they finally form mature crystal beads.

[0011] 3) Mature crystal beads precipitate and accumulate at the bottom of the crystal bead fluidized tower and are discharged from the crystal bead collection port; the wastewater after the reaction passes through the clarification zone and is discharged from the effluent outlet.

[0012] S2. Secondary separation

[0013] a) Water discharged from the outlet of the crystal bead fluidized bed tower mixes with coagulant to form a small floc mixture;

[0014] b) The small floc mixture enters the high-efficiency separation tower and comes into contact with the flocculant under the action of air lift. The small flocs gradually grow larger and are circulated and fluidized under the action of air lift until the large flocs are large enough to settle to the bottom of the high-efficiency separation tower.

[0015] c) Large flocs are discharged from the sludge discharge port at the bottom of the high-efficiency separation tower, and then mixed with sewage before entering the crystal bead fluidization tower again.

[0016] By adopting the above technical solution, wastewater undergoes a process where a precipitant reacts with pollutants to form small precipitate particles. These particles are then adsorbed by seed crystals, enveloping the seed crystals and beginning to form rudimentary crystal beads. With the continuous introduction of raw water and gas, these rudimentary crystal beads are suspended in the crystal bead fluidization zone. They then continuously contact and envelop the newly formed small particles, undergoing a continuous fluidization cycle in the fluidization zone until mature crystal beads are formed. At this point, the current flow is insufficient to support the mature crystal beads, which then settle and accumulate at the bottom of the crystal bead fluidization tower and are discharged from the mature crystal bead collection port.

[0017] The effluent after fluidized bed crystal treatment still contains a certain amount of pollutants. These pollutants are then separated through a secondary sedimentation process to ensure the final effluent quality. This process also reduces the need for excessive reagent dosage, saving over 20% of the reagent usage. Furthermore, the sludge obtained after the secondary separation is returned to the fluidized bed crystal treatment tower to form mature crystal beads before discharge. The final discharge consists of large, mature crystal beads that can be recycled, eliminating the need for a sludge treatment system and resulting in low equipment costs.

[0018] Furthermore, the upward flow velocity of the water in the crystal bead fluidized tower is 60-100 m / h, and the upward flow velocity of the water in the high-efficiency separation tower is 20-60 m / h.

[0019] Furthermore, the upward flow velocity of the water in the crystal bead fluidized tower is 80-100 m / h.

[0020] By adopting the above technical solution, the upward flow rate is high, and the entire process of crystal bead fluidization can be completed using integrated equipment, which can reduce the footprint by more than 50%.

[0021] Furthermore, the seed crystal is at least one of quartz sand or garnet.

[0022] Furthermore, the seed crystals have a particle size of 0.1-0.3 mm.

[0023] Furthermore, the seed crystal is a composite modified seed crystal, and its modification method is as follows:

[0024] i) Sodium hypochlorite is mixed with glacial acetic acid to obtain a mixed solution. The mixed solution is used to oxidize the seed crystals. The oxidized seed crystals are then immersed in a urea solution and reacted at 60-65℃ for 2 hours. After filtration, washing, and drying, amino-seed crystals are obtained.

[0025] ii) Dissolve and mix calcium chloride and aluminum chloride to obtain a modified solution. Adjust the pH of the modified solution to 10, add amino-seed crystals to the modified solution, and shake and react at 60-65℃ for 3 hours. Then filter, dry, wash and dry to obtain composite modified seed crystals.

[0026] Furthermore, the weight ratio of calcium chloride to aluminum chloride is (2-4):1.

[0027] Furthermore, the concentration of the urea solution is 2-3 mol / L.

[0028] By employing the above technical solution, quartz sand or garnet is used as seed crystals and modified accordingly. First, urea modification is used to graft amino groups onto the seed crystal surface, resulting in grooves of a certain width and depth. This increases both surface roughness and specific surface area, providing more grafting sites for subsequent calcium and aluminum ions. Then, calcium chloride and aluminum chloride are used for composite grafting, grafting calcium and aluminum ions onto the seed crystal. This results in a layered crystal structure on the seed crystal surface composed of numerous aggregated micron-sized plates with high specific surface area, exhibiting irregular orientation and size, significantly enhancing the adsorption of small particle precipitates. These layered crystals composed of aluminum and calcium ions possess interlayer exchange properties, promoting crystal growth and maturation, and improving the crystallization effect.

[0029] Furthermore, different precipitants are selected based on the different pollutants in the wastewater. When the wastewater needs to be de-hardened, the precipitant is NaOH solution; when the wastewater needs to be de-sulfurized, the precipitant is... - At that time, the precipitant was a calcium salt solution; wastewater needed to remove PO4. 3- At that time, the precipitant was an iron salt solution.

[0030] Furthermore, when wastewater requires hardening removal, the effluent pH value of the beaded fluidized bed tower should be 9.5-10.3; when wastewater requires F removal... - At that time, the effluent pH value of the fluidized bed reactor was 8.5-9.0; the wastewater required PO4 removal. 3- At that time, the pH value of the effluent from the crystal bead fluidized bed tower was 3-5.

[0031] By adopting the above technical solutions, different types of wastewater can be treated in a targeted manner, greatly improving the wastewater purification effect.

[0032] In summary, this application has the following beneficial effects:

[0033] (1) By adding seed crystals, most of the sludge is discharged in the form of crystal beads; by returning the sludge from the separation device to the crystal bead fluidization tower to form crystal beads for discharge; the amount of sludge is small and the sludge treatment device is smaller.

[0034] (2) The small footprint of the crystal bead fluidized reactor can reach 100 m³ / h; the high efficiency of the fluidized separation reactor can reach 60 m³ / h; which can reduce the footprint by more than 50%;

[0035] (3) Short construction period: the equipment is processed directly in the factory and transported directly to the site for installation. Only the equipment foundation needs to be provided, which can shorten the construction period by 3-6 months.

[0036] (4) It saves on the amount of medicine, with a dosage that is more than 20% lower than that of traditional medicines;

[0037] (5) Low investment, no civil engineering, small amount of mud, low investment in plate and frame filter press or even no need to set up, and no need for secondary lifting. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the wastewater treatment process in an embodiment of this application. Detailed Implementation

[0039] The present application will be further described in detail below with reference to the embodiments.

[0040] Example of raw material and intermediate preparation

[0041] raw material

[0042] The raw materials used in the embodiments of this application are all commercially available.

[0043] Preparation Example

[0044] Preparation Example 1

[0045] A composite modified seed crystal, the preparation method of which is as follows:

[0046] i) Sodium hypochlorite and glacial acetic acid were mixed to obtain a mixed solution with an effective chlorine concentration of 10% and a pH value of 5. Seed crystals were soaked in the mixed solution for 24 hours to oxidize the seed crystals. The oxidized seed crystals were then soaked in a 3 mol / L urea solution and reacted at 60°C for 2 hours. The solution was then filtered, washed, and dried to obtain amino-seed crystals.

[0047] ii) Dissolve and mix calcium chloride and aluminum chloride in a weight ratio of 2:1 to obtain a modified solution. Add 2 mol / L sodium hydroxide and 0.5 mol / L sodium carbonate to adjust the pH of the modified solution to 10. Immerse the amino-seed crystals in the modified solution and shake the reaction at 60°C for 3 hours. Then filter, dry, wash and dry to obtain the composite modified seed crystals.

[0048] Preparation Example 2

[0049] Unlike Preparation Example 1, in Preparation Example 2, the weight ratio of calcium chloride to aluminum chloride was 3:1.

[0050] Preparation Example 3

[0051] Unlike Preparation Example 1, in Preparation Example 3 the weight ratio of calcium chloride to aluminum chloride was 4:1.

[0052] Preparation Example 4

[0053] Unlike Preparation Example 1, in Preparation Example 4, the weight ratio of calcium chloride to aluminum chloride was 5:1.

[0054] Preparation Example 5

[0055] Unlike Preparation Example 1, in Preparation Example 5, the weight ratio of calcium chloride to aluminum chloride was 1:3. Example

[0056] Example 1

[0057] See attached document Figure 1 A fluidized bed reactor wastewater treatment process comprising the following steps:

[0058] The wastewater is fluoride-containing wastewater from a chemical plant. Specific water quality details are shown in Table 1.

[0059] Table 1. Water Quality Table for Fluoride-Containing Wastewater

[0060]

[0061] S1. Bead fluidization:

[0062] 1) Wastewater enters the distribution zone from the inlet of the fluidized bed tower and flows evenly into the fluidized bed zone through the distribution pipe. The upward flow velocity of the water is 60 m / h. Simultaneously, CaCl2 solution, added as a precipitant, also enters the fluidized bed zone through the reagent dosing pipe. NaOH is also added to adjust the pH value. Under the action of air stripping, the wastewater comes into contact with the precipitant, and the precipitant reacts with the F in the wastewater. - The reaction produces small precipitate particles.

[0063] 2) The generated small particle sediments combine with quartz sand seed crystals with a particle size of 0.1-0.3mm to begin forming the prototype of crystal beads. Through the continuous entry of raw water and gas, the prototype crystal beads are suspended in the crystal bead fluidization zone. Then, they continuously come into contact with and are continuously wrapped by the newly formed small particle sediments. The crystal beads are continuously fluidized and circulated in the crystal bead fluidization zone until they finally form mature crystal beads.

[0064] 3) Mature crystal beads precipitate and accumulate at the bottom of the crystal bead fluidized bed tower and are discharged from the crystal bead collection port; the wastewater after the reaction passes through the clarification zone and is discharged from the effluent outlet; the effluent outlet of the crystal bead fluidized bed tower is equipped with a pH meter, which is interlocked with the addition of NaOH to control the pH value between 8.5 and 9, and the adjustment is controlled by PLC interlocking.

[0065] S2. Secondary separation

[0066] a) Water discharged from the outlet of the crystal bead fluidized tower mixes with potassium aluminate coagulant to form a small floc mixture;

[0067] b) The small floc mixture enters the high-efficiency separation tower. The water flows upward at a velocity of 60 m / h and comes into contact with the flocculant under the action of air lift. The small flocs gradually grow larger and are circulated and fluidized under the action of air lift until the large flocs are large enough to settle to the bottom of the high-efficiency separation tower.

[0068] c) Large flocs are discharged from the sludge discharge port at the bottom of the high-efficiency separation tower, and then mixed with sewage before entering the crystal bead fluidization tower again.

[0069] Example 2

[0070] Unlike Example 1, the seed crystals in Example 2 are quartz sand with a particle size of 0.5-0.6 mm.

[0071] Example 3

[0072] Unlike Example 1, in Example 3 the upward flow velocity of water in the bead fluidization tower is 80 m / h, and the upward flow velocity of water in the high-efficiency separation tower is 50 m / h.

[0073] Example 4

[0074] Unlike Example 1, in Example 4 the upward flow velocity of water in the bead fluidization tower is 100 m / h, and the upward flow velocity of water in the high-efficiency separation tower is 40 m / h.

[0075] Examples 5-9

[0076] Unlike Example 1, in Examples 5-9, the quartz sand was replaced with composite modified seed crystals obtained by modifying the quartz sand using the methods of Preparation Examples 1-5.

[0077] Performance testing

[0078] The effluent water quality of Examples 1-9 was tested, and the results are shown in Table 2.

[0079] Table 2. Effluent Water Quality Tables for Examples 1-9

[0080]

[0081] Combining Examples 1 and 3-4, and referring to Table 2, it can be seen that the upward flow velocity of the crystal bead fluidized tower can reach 100 m / h, and the upward flow velocity in the high-efficiency separation tower can reach 60 m / h. The quality of the effluent still meets the requirements. The high upward flow velocity can meet the requirements of the vertically installed integrated crystal bead fluidized tower and the integrated high-efficiency separation tower, reducing the equipment footprint.

[0082] Combining Examples 1 and 5-9, and referring to Table 2, it can be seen that modifying the seed crystals can further improve the wastewater treatment effect, with the modification process in Example 6 being the optimal one. This may be because the modified seed crystals exhibit a lamellar crystal structure composed of a large number of aggregated micron-sized plates with high specific surface area, exhibiting irregular orientation and size, which greatly enhances the adsorption of small particle precipitates; these lamellar crystals composed of aluminum and calcium ions possess the physical property of interlayer exchange, promoting the growth and maturation of crystal beads and improving the crystallization effect.

[0083] Example 10

[0084] A fluidized bed reactor wastewater treatment process comprising the following steps:

[0085] The wastewater is ferric phosphate wastewater, and the specific water quality is shown in Table 3:

[0086] Table 3. Water Quality Table for Ferric Phosphate Wastewater

[0087]

[0088] S1. Bead fluidization:

[0089] 1) Wastewater enters the distribution zone from the inlet of the fluidized bed tower and flows evenly into the fluidized bed zone through the distribution pipe. The upward flow velocity of the water is 100 m / h. Simultaneously, FeCl3 solution, added as a precipitant, also enters the fluidized bed zone through the reagent dosing pipe. NaOH is also added to adjust the pH value. Under the action of air stripping, the wastewater comes into contact with the precipitant, and the precipitant reacts with the Fe in the wastewater. - The reaction produces small precipitate particles.

[0090] 2) The generated small particle sediments combine with quartz sand seed crystals with a particle size of 0.1-0.3mm to begin forming the prototype of crystal beads. Through the continuous entry of raw water and gas, the prototype crystal beads are suspended in the crystal bead fluidization zone. Then, they continuously come into contact with and are continuously wrapped by the newly formed small particle sediments. The crystal beads are continuously fluidized and circulated in the crystal bead fluidization zone until they finally form mature crystal beads.

[0091] 3) Mature crystal beads precipitate and accumulate at the bottom of the crystal bead fluidized bed tower and are discharged from the crystal bead collection port; the wastewater after the reaction passes through the clarification zone and is discharged from the effluent outlet; the effluent outlet of the crystal bead fluidized bed tower is equipped with a pH meter, which is interlocked with the addition of NaOH to control the pH value between 3 and 5, and the adjustment is controlled by PLC interlock.

[0092] S2. Secondary separation

[0093] a) Water discharged from the outlet of the crystal bead fluidized tower mixes with potassium aluminate coagulant to form a small floc mixture;

[0094] b) The small floc mixture enters the high-efficiency separation tower. The water flows upward at a velocity of 40 m / h and comes into contact with the flocculant under the action of air lift. The small flocs gradually grow larger and are circulated and fluidized under the action of air lift until the large flocs are large enough to settle to the bottom of the high-efficiency separation tower.

[0095] c) Large flocs are discharged from the sludge discharge port at the bottom of the high-efficiency separation tower, and then mixed with sewage before entering the crystal bead fluidization tower again.

[0096] Example 11

[0097] Unlike Example 10, in Example 11, the quartz sand was replaced with composite modified seed crystals obtained by modifying the quartz sand using the method of Preparation Example 2.

[0098] Performance testing

[0099] The effluent water quality in Examples 10-11 was tested, and the results are shown in Table 4.

[0100] Table 4. Effluent Water Quality Tables for Examples 11-11

[0101]

[0102] As can be seen from Examples 10-11 and Table 4, the processing technology of this application is effective for PO4-containing compounds. 3- It also has excellent treatment effects on wastewater.

[0103] Example 12

[0104] A fluidized bed reactor wastewater treatment process comprising the following steps:

[0105] The wastewater is gasified ash water. The project requires the removal of hardness from the water. The specific water quality is shown in Table 5.

[0106] Table 5. Water Quality of Gasification Ash Water

[0107]

[0108] S1. Bead fluidization:

[0109] 1) Wastewater enters the distribution zone from the inlet of the fluidized bed tower and flows evenly into the fluidized bed zone through the distribution pipe. The upward flow velocity of the water is 100 m / h. Simultaneously, NaOH solution, added as a precipitant through the reagent dosing pipe, also enters the fluidized bed zone. Under the action of air stripping, the wastewater comes into contact with the precipitant, and the precipitant reacts with the F in the wastewater. - The reaction produces small precipitate particles.

[0110] 2) The generated small particle sediments combine with quartz sand seed crystals with a particle size of 0.1-0.3mm to begin forming the prototype of crystal beads. Through the continuous entry of raw water and gas, the prototype crystal beads are suspended in the crystal bead fluidization zone. Then, they continuously come into contact with and are continuously wrapped by the newly formed small particle sediments. The crystal beads are continuously fluidized and circulated in the crystal bead fluidization zone until they finally form mature crystal beads.

[0111] 3) Mature crystal beads precipitate and accumulate at the bottom of the crystal bead fluidized tower and are discharged from the crystal bead collection port; the wastewater after the reaction passes through the clarification zone and is discharged from the outlet; the outlet of the crystal bead fluidized tower is equipped with a pH meter, which is interlocked with the addition of NaOH to control the pH value between 9.5 and 10.3, and is controlled and adjusted by PLC interlock.

[0112] S2. Secondary separation

[0113] a) Water discharged from the outlet of the crystal bead fluidized tower mixes with potassium aluminate coagulant to form a small floc mixture;

[0114] b) The small floc mixture enters the high-efficiency separation tower. The water flows upward at a velocity of 40 m / h and comes into contact with the flocculant under the action of air lift. The small flocs gradually grow larger and are circulated and fluidized under the action of air lift until the large flocs are large enough to settle to the bottom of the high-efficiency separation tower.

[0115] c) Large flocs are discharged from the sludge discharge port at the bottom of the high-efficiency separation tower, and then mixed with sewage before entering the crystal bead fluidization tower again.

[0116] Example 13

[0117] Unlike Example 12, in Example 13, the quartz sand was replaced with composite modified seed crystals obtained by modifying the quartz sand using the method of Preparation Example 2.

[0118] Performance testing

[0119] The effluent water quality in Examples 12-13 was tested, and the results are shown in Table 6.

[0120] Table 6. Effluent Water Quality Tables for Examples 12-13

[0121]

[0122] As can be seen from Examples 12-13 and Table 6, the treatment process of this application also has excellent treatment effect on hardening removal of wastewater.

[0123] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A fluidized bed reactor wastewater treatment process, characterized in that, Includes the following steps: S1. Bead fluidization: 1) Wastewater enters the crystal bead fluidized tower and comes into contact with the precipitant in the crystal bead fluidization zone under the action of air stripping. The precipitant reacts with the pollutants in the wastewater to generate small particulate precipitates. 2) The generated small particle precipitates combine with the seed crystals to begin forming the prototype of crystal beads. Through the continuous entry of raw water and gas, the prototype crystal beads are suspended in the crystal bead fluidization zone. Then, they continuously come into contact with and are continuously wrapped by the newly formed small particle precipitates. The crystal beads are continuously fluidized and circulated in the crystal bead fluidization zone until they finally form mature crystal beads. 3) Mature crystal beads precipitate and accumulate at the bottom of the crystal bead fluidized tower and are discharged from the crystal bead collection port; the wastewater after the reaction passes through the clarification zone and is discharged from the effluent outlet. S2. Secondary separation a) Water discharged from the outlet of the crystal bead fluidized tower mixes with coagulant to form a small floc mixture; b) The small floc mixture enters the high-efficiency separation tower and comes into contact with the flocculant under the action of air lift. The small flocs gradually grow larger and are circulated and fluidized under the action of air lift until the large flocs are large enough to settle to the bottom of the high-efficiency separation tower. c) Large flocs are discharged from the sludge discharge port at the bottom of the high-efficiency separation tower, and then mixed with the sewage before entering the crystal bead fluidization tower again; The seed crystal is at least one of quartz sand or garnet; The seed crystal is a composite modified seed crystal, and its modification method is as follows: i) Sodium hypochlorite is mixed with glacial acetic acid to obtain a mixed solution. The mixed solution is used to oxidize the seed crystals. The oxidized seed crystals are then immersed in a urea solution and reacted at 60-65℃ for 2 hours. After filtration, washing, and drying, amino-seed crystals are obtained. ii) Dissolve and mix calcium chloride and aluminum chloride to obtain a modified solution. Adjust the pH of the modified solution to 10, add amino-seed crystals to the modified solution, and shake and react at 60-65℃ for 3 hours. Then filter, dry, wash and dry to obtain composite modified seed crystals.

2. The fluidized bed reactor wastewater treatment process according to claim 1, characterized in that, The upward flow velocity of water in the crystal bead fluidized bed tower is 60-100 m / h, and the upward flow velocity of water in the high-efficiency separation tower is 20-60 m / h.

3. The fluidized bed reactor wastewater treatment process according to claim 2, characterized in that, The upward flow velocity of the water in the crystal bead fluidized tower is 80-100 m / h.

4. The fluidized bed reactor wastewater treatment process according to claim 1, characterized in that, The seed crystals have a particle size of 0.1-0.3 mm.

5. The fluidized bed reactor wastewater treatment process according to claim 1, characterized in that, The weight ratio of calcium chloride to aluminum chloride is (2-4):

1.

6. The fluidized bed reactor wastewater treatment process according to claim 1, characterized in that, The concentration of the urea solution is 2-3 mol / L.

7. The fluidized bed reactor wastewater treatment process according to claim 1, characterized in that, Depending on the different pollutants in the wastewater, different precipitants are selected. When the wastewater needs to be de-hardened, the precipitant is NaOH solution; when the wastewater needs to be de-F... - At that time, the precipitant was a calcium salt solution; wastewater needed to remove PO4. 3- At that time, the precipitant was an iron salt solution.

8. The fluidized bed reactor wastewater treatment process according to claim 7, characterized in that, When wastewater requires hardness removal, the effluent pH value of the beaded fluidized bed tower should be 9.5-10.3; when wastewater requires F removal... - At that time, the effluent pH value of the fluidized bed reactor was 8.5-9.0; the wastewater required PO4 removal. 3- At that time, the pH value of the effluent from the crystal bead fluidized bed tower was 3-5.

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