Device and method for removing hardness ions in wastewater

Abstract

The invention relates to the field of wastewater treatment, in particular to a device and a method for removing hardness ions in wastewater. The device comprises an outer cylinder, an inner cylinder, a water inlet, a dosing port and the like, a carrier for removing hardness is arranged in the inner cylinder, the outer cylinder is provided with a carrier discharging and adding port, the outer cylinder and the inner cylinder are respectively provided with the water inlet and a dosing port, industrial wastewater enters the device from the water inlet, a medicament enters the device from the dosing port, and after reaction, the wastewater flows to the outer cylinder from the top of the inner cylinder and then is discharged from the dosing port. And finally, the generated carrier is discharged from the outer cylinder. Compared with a traditional method, the method has the beneficial effects that the hydraulic retention time for treating hardness is short, the efficiency is high, traditional sludge cannot be generated, the scaling risk is reduced, and the utilization efficiency of various water resources is improved.

Description

Technical Field

[0001] The invention relates to the field of wastewater treatment, and in particular to a device and method for removing hardness ions in wastewater. Background Art

[0002] With the acceleration of industrial progress, a large amount of wastewater is generated in various industries, such as various industrial wastewater, reverse osmosis concentrated water, oil and gas field wastewater, circulating cooling water of steel mills and power plants, etc., which contain a large amount of hardness ions, calcium and magnesium ions, which seriously affect the application and reuse of its water quality. This is because hardness ions will cause scaling on the inner wall of the pipe during its application and reuse, and the large amount of scale accumulation will affect the water flow area of ​​the pipe, shorten the life of the equipment, and create safety hazards.

[0003] The reagent precipitation method based on the solubility product principle is the earliest and most widely used process for removing hardness from water. It achieves the purpose of softening water quality by adding chemical reagents to water to form CaCO3 and Mg(OH)2 precipitation with Ca2+ and Mg2+. Common softening agents mainly include CaO, NaOH and Na2CO3. However, in practical applications, multiple reagents are often added in combination to achieve the best removal effect by combining the strengths of each method. Commonly used methods include lime softening method, caustic soda softening method and lime-soda ash softening method. However, this method will produce a large amount of loose sludge, and flocculants need to be added to assist in improving sedimentation performance for subsequent treatment. In addition, methods such as ion exchange are also often used, but these equipments currently used to remove hardness ions are generally structure-type, occupying a large area, lengthy process flow, and large investment, which brings huge environmental pressure to enterprises. Therefore, in view of the defects in the existing water treatment hardness, while finding a high-efficiency removal method, it is also necessary to develop and research a short-process and high-efficiency wastewater hardness treatment equipment. Summary of the invention

[0004] In view of the above, the purpose of the present invention is to provide a device and method for removing hardness ions in wastewater to address the shortcomings of current hardness removal methods and devices, such as long process, large footprint and high cost.

[0005] A device for removing hardness ions from wastewater in this scheme includes an outer cylinder, an inner cylinder, a carrier addition and discharge port, a water inlet, a drug inlet, a water outlet, a first inclined baffle, a second inclined baffle, a conical baffle, and an outer cylinder overflow weir; The inner cylinder is arranged in the outer cylinder; The first inclined baffle, the conical baffle, the second inclined baffle, and the outer cylinder overflow weir are all located inside the inner cylinder and are arranged above the inner cylinder in order from low to high; The carrier adding and discharging ports are arranged at the bottom of the outer cylinder, the water inlet and the drug inlet are arranged below the outer periphery of the outer cylinder, and the water outlet is arranged above the outer periphery of the outer cylinder.

[0006] Furthermore, the distance between the water inlet and the drug inlet and the bottom is 500-800 mm.

[0007] Furthermore, there is one water inlet and it is a tangential water inlet.

[0008] Furthermore, there are two drug inlets, and the angle between the two is 90 degrees.

[0009] Furthermore, the number of the first inclined baffles and the second inclined baffles is 8-10, and the angle between the two and the inner wall of the outer tube is 30-45°.

[0010] Furthermore, the diameter of the conical baffle is 0.5-0.8 times the diameter of the outer cylinder.

[0011] Furthermore, both the inner cylinder and the outer cylinder are equipped with a hardness-removing carrier for removing hardness ions, and the height of the hardness-removing carrier is 1500-2000 mm.

[0012] Furthermore, the distance between the bottom of the inner cylinder and the bottom of the outer cylinder is 200-400 mm.

[0013] Furthermore, the ratio of the diameter of the inner cylinder to that of the outer cylinder is 1:2 to 1:5, and the ratio of the height of the inner cylinder to that of the outer cylinder is 2:3 to 2:5.

[0014] A method for removing hardness ions from wastewater in this scheme: first, add a hardness removal carrier to the device, then raw water enters through the water inlet, and at the same time, the reagent enters from the reagent inlet. The hardness ions in the water are removed under the action of the alkaline reagent, and finally the effluent is discharged from the water outlet, and the hardness ions in the effluent are greatly reduced. After the reaction has been going on for a period of time, the load of the carrier reaches the maximum, at which time it is discharged, and a new carrier is added to continue the reaction.

[0015] Compared with the existing device for processing high hardness ions, the beneficial effects of the present invention are: 1. Short process flow and short hydraulic retention time: The device for removing hardness ions provided by the present invention can feed water and chemicals at the same time, without the need for other processes, with a short process flow and short retention time.

[0016] 2. The equipment occupies a small area and has low cost: Compared with the traditional process, the device provided by the present invention can save 50% of the floor space and has lower cost than the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the principle of this application; Figure 2 This is a working principle diagram of water inlet / drug addition of the present invention; Figure numerals: drug inlet 1, water inlet 2, carrier addition and discharge port 3, water outlet 4, first inclined baffle 5, second inclined baffle 6, outer tube 7, inner tube 8, conical baffle 9, outer tube overflow weir 10. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Reference Figure 1 The device shown is used for removing hardness ions in wastewater, comprising an outer cylinder 7, an inner cylinder 8, a carrier addition and discharge port 3, a water inlet 2, a drug inlet 1, a water outlet 4, a first inclined baffle 5, a second inclined baffle 6, a conical baffle 9, and an outer cylinder overflow weir 10.

[0020] The outer tube 7 and the inner tube 8 are fixed in the air inside the outer tube 7 by a certain number of brackets.

[0021] Among them, the first inclined baffle 5, the conical baffle 9, the second inclined baffle 6, and the outer tube overflow weir 10 are all located in the inner tube 8, and are arranged above the inner tube 8 in sequence from low to high; the carrier addition and discharge port 3 is arranged at the bottom end of the outer tube 7, the water inlet 2 and the drug inlet 1 are arranged below the outer periphery of the outer tube 7, and the water outlet 4 is arranged above the outer periphery of the outer tube 7.

[0022] The first inclined baffle 5, the conical baffle 9 and the second inclined baffle 6 all serve to block the hard carrier in the device and prevent it from escaping from the device due to the impact of water flow.

[0023] Removal method: First, add the hardness removal carrier into the device, and the carrier flows out from the top of the inner tube 8 and flows in from the bottom of the inner tube 8, and the cycle repeats; then the raw water enters through the water inlet 2, and the reagent enters through the reagent inlet 1, and the hardness ions in the water are removed under the action of the alkaline reagent, and the final water is discharged from the water outlet 4, and the hardness ions in the water are greatly reduced. After the reaction has been going on for a period of time, the load of the carrier reaches the maximum, and it is discharged at this time, and a new carrier is added to continue the reaction.

[0024] Preferably, the distance between the water inlet 2 and the drug inlet 1 and the bottom is 500-800 mm, which can be changed according to the processing volume. The larger the processing volume, the greater the distance from the bottom.

[0025] Preferably, the water inlet 2 is one and is tangential, so as to ensure that the water inlet presents a spiral upward state. In addition, the drug inlet 1 can be two (such as Figure 2 ), which is non-tangential drug delivery, and the angle between the two is 90°.

[0026] Preferably, the number of the first inclined baffles 5 and the second inclined baffles 6 is 8-10, which are arranged around the inner wall of the outer cylinder 7, and the angle between the two and the inner wall of the outer cylinder 7 is 30-45°. Since the carrier first enters the inner cylinder 8 and then enters the outer cylinder 7 from the upper opening of the inner cylinder 8, its flow rate is greatly reduced at this time, and a part of it falls due to the reduced flow rate, while the other lighter part continues to move upward and falls back after hitting the baffle. The setting of the baffle angle here is to ensure that the carrier does not flow out.

[0027] Preferably, the diameter of the conical baffle 9 is 0.5-0.8 times the diameter of the outer cylinder 7 .

[0028] Preferably, both the inner cylinder 8 and the outer cylinder 7 are equipped with a hardness removal carrier for removing hardness ions, and the height of the hardness removal carrier is 1500-2000 mm. The greater the processing volume, the higher the carrier height.

[0029] Preferably, the distance between the bottom of the inner cylinder 8 and the bottom of the outer cylinder 7 is 200-400 mm, and the greater the processing volume, the greater the distance.

[0030] Preferably, the diameter ratio of the inner cylinder 8 to the outer cylinder 7 is 1:2 to 1:5, and the height ratio of the inner cylinder 8 to the outer cylinder 7 is 2:3 to 2:5. The larger the processing capacity, the larger the ratio, and ultimately the processing capacity of 5-500 m3 / h can be achieved.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for removing hardness ions in wastewater, characterized in that: The invention comprises an outer cylinder (7), an inner cylinder (8), a carrier adding and discharging port (3), a water inlet (2), a drug inlet (1), a water outlet (4), a first inclined baffle (5), a second inclined baffle (6), a conical baffle (9), and an outer cylinder overflow weir (10); the inner cylinder (8) is arranged in the outer cylinder (7); the first inclined baffle (5), the conical baffle (9), the second inclined baffle (6), and the outer cylinder overflow weir (10) are all located in the inner cylinder (8), and are arranged in order from low to high above the inner cylinder (8); the carrier adding and discharging port (3) is arranged at the bottom end of the outer cylinder (7); the water inlet (2) and the drug inlet (1) are arranged below the outer periphery of the outer cylinder (7); and the water outlet (4) is arranged above the outer periphery of the outer cylinder (7).

2. A device for removing hardness ions in wastewater according to claim 1, characterized in that: The distance between the water inlet (2) and the drug inlet (1) from the bottom is 500-800 mm.

3. The device for removing hardness ions in wastewater according to claim 1, characterized in that: There is one water inlet (2) and it is a tangential water inlet.

4. The device for removing hardness ions in wastewater according to claim 1, characterized in that: There are two drug inlets (1), and the angle between the two is 90 degrees.

5. The device for removing hardness ions in wastewater according to claim 1, characterized in that: The number of the first inclined baffles (5) and the second inclined baffles (6) is 8-10, and the angle between the two and the inner wall of the outer cylinder (7) is 30-45 degrees.

6. The device for removing hardness ions in wastewater according to claim 1, characterized in that: The diameter of the conical baffle (9) is 0.5-0.8 times the diameter of the outer cylinder (7).

7. The device for removing hardness ions in wastewater according to claim 1, characterized in that: The inner cylinder (8) and the outer cylinder (7) are both equipped with a hardness-removing carrier for removing hardness ions, and the height of the hardness-removing carrier is 1500-2000 mm.

8. The device for removing hardness ions in wastewater according to claim 1, characterized in that: The distance between the bottom of the inner cylinder (8) and the bottom of the outer cylinder (7) is 200-400 mm.

9. The device for removing hardness ions in wastewater according to claim 1, characterized in that: The diameter ratio of the inner cylinder (8) to the outer cylinder (7) is 1:2 to 1:5, and the height ratio of the inner cylinder (8) to the outer cylinder (7) is 2:3 to 2:

5.

10. A method for removing hardness ions from wastewater based on the device for removing hardness ions in claim 1, characterized in that: First, a hardness removal carrier is added to the device, and then raw water enters through the water inlet (2), and at the same time, the reagent enters through the reagent inlet (1). The hardness ions in the water are removed under the action of the alkaline reagent, and finally the water is discharged from the water outlet (4); after the reaction has been carried out for a period of time, the load of the hardness removal carrier reaches a maximum, at which time it is discharged, and a new hardness removal carrier is added to continue the reaction.

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