Reaction and separation integrated device

Abstract

The utility model relates to a reaction and separation integrated device which comprises a reaction cylinder arranged at the bottom and a scum hopper arranged at the top, and a water distribution cylinder arranged above the reaction cylinder is communicated with the reaction cylinder in a sleeving manner; the bottom of the reaction cylinder is communicated with a water distribution pipeline system, the water distribution pipeline system is used for inputting different materials into the reaction cylinder, and a material outlet is formed in the top of the reaction and separation integrated device. According to the reaction and separation integrated device, the reaction for reducing the hardness of water can be efficiently carried out, solid (CaCO3, Mg (OH) 2 precipitates, suspended solids in wastewater and the like) and liquid separation are synchronously realized, and the device is low in operation cost and has excellent economical efficiency and practicability.

Description

Technical Field

[0001] The utility model relates to a separation device, in particular to a reaction-separation integrated device. Background Art

[0002] In the process of water treatment, water contains calcium and magnesium scale-forming ions. The hardness of water is measured by "hardness". High-hardness water will cause scale formation on equipment and pipelines. With the gradual accumulation of scale, it will also cause pipeline blockage, reduced flow rate, and decreased heating efficiency of equipment. Especially in the reverse osmosis, evaporation crystallization devices, etc. in the zero liquid discharge process of wastewater, there are strict requirements for the hardness of the influent water. Ca 2+ , Mg 2+ ions constitute the hardness of water. Once these ions enter the concentration reduction or evaporation crystallization equipment, they will form scale adhering to the membrane or the wall of the column, reducing the water production efficiency of the membrane and evaporation, and even blocking the membrane pores, pipelines or devices, affecting the operation of the equipment.

[0003] Therefore, in industry, special equipment is needed to reduce the hardness of water. These equipment usually reduce the content of Ca 2+ , Mg 2+ ions through physical and chemical reactions. However, Ca 2+ , Mg 2+ ions are very easy to form poorly soluble substances, and a large amount of solid-liquid mixtures often appear in the reaction process, hindering the progress of the reaction and affecting the effect of hardness reduction. The existing reaction devices for removing water hardness often have problems such as frequent blockage or decreased effect after a period of use. Content of the Utility Model

[0004] In view of the above problems, the utility model provides a reaction-separation integrated device, which combines reaction and separation. The device can utilize CO2 and heat in the flue gas of the steel plant to achieve efficient reaction, and simultaneously realizes the separation of solids (such as CaCO3, Mg(OH)2 precipitates and suspended solids in the wastewater) and liquids, significantly reducing the hardness of the wastewater.

[0005] To solve this technical problem, the utility model adopts the following solutions:

[0006] A reaction-separation integrated device includes a reaction cylinder arranged at the bottom and a scum hopper arranged at the top. A water distribution cylinder arranged above the reaction cylinder is sleeved and communicated with the reaction cylinder; the bottom of the reaction cylinder is communicated with a water distribution pipeline system, and the water distribution pipeline system is used to input different materials into the reaction cylinder. A material outlet is arranged at the top of the reaction-separation integrated device.

[0007] Furthermore, the central axis of the reaction cylinder coincides with the central axis of the reaction-separation integrated device and the central axis of the water distribution cylinder.

[0008] Further, the upper end of the reaction cylinder is cylindrical and the lower end is conical. Then, the water distribution pipeline system includes at least one riser pipe arranged at the conical bottom of the reaction cylinder, and the opening of the riser pipe faces upward.

[0009] Further, the length of the riser pipe is 1 - 10 cm.

[0010] Further, the reaction cylinder is rectangular, and a dissolved air chamber is arranged inside the reaction cylinder. Then, the water distribution pipeline system includes at least one straight pipe horizontally arranged in the dissolved air chamber.

[0011] Further, the length of the straight pipe is 1 - 10 cm, the end of the straight pipe is connected to an elbow, and the elbow opens upward relative to the dissolved air chamber.

[0012] Further, the diameter of the elbow is 4 - 15 cm.

[0013] Further, the length of the straight pipe is greater than 10 cm, and holes with a diameter of 10 - 15 mm are drilled every 20 - 30 cm on the straight pipe.

[0014] Further, the water distribution pipeline system includes a assembled pipe formed by splicing 2 straight pipes into an H shape, and multiple holes are opened on the assembled pipe.

[0015] Further, holes with a diameter of 10 - 15 mm are opened every 20 - 30 cm on the assembled pipe.

[0016] By adopting the foregoing technical solutions, compared with the prior art, the utility model can efficiently reduce the hardness of water, and simultaneously realizes solid (CaCO3, Mg(OH)2 precipitates and suspended matters in the wastewater, etc.) - liquid separation, greatly reducing the one - time investment and operating costs.

[0017] Further, the optimized water distribution pipeline system of the utility model is used to achieve uniform water distribution, which is very important for promoting the full reaction of the dissolved air water and the wastewater. Through 3 optimized water distribution pipeline designs, chemical reactions occur efficiently in the reaction cylinder, achieving the effect of greatly reducing the hardness of the wastewater. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the device for reducing the hardness of wastewater provided by the embodiment of the utility model;

[0019] Figure 2 is a schematic structural diagram of the integrated reaction and separation device provided by the embodiment of the utility model. Detailed Embodiments

[0020] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the following described embodiments are some embodiments of the present utility model, rather than all embodiments, and are only used to illustrate the present utility model, and should not be construed as limiting the scope of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model. For those conditions not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments not specified by the manufacturer can all be obtained as conventional products through commercial purchase.

[0021] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] Embodiment 1:

[0024] Reference Figure 1 , the device for reducing the hardness of wastewater includes a reaction device 1, the reaction device 1 is connected to a stirring device 2, and the outlet of the reaction device 1 is connected to a reaction and separation integrated device 3.

[0025] For the specific structure of the reaction and separation integrated device 3, see Figure 2 , the reaction and separation integrated device 3 includes a reaction cylinder 31 arranged at the bottom and a scum hopper 33 arranged at the top. A water distribution cylinder 32 arranged above the reaction cylinder 31 is sleeved and communicated with the reaction cylinder 31; the bottom of the reaction cylinder 31 is communicated with a water distribution pipeline system 34, and the water distribution pipeline system 34 is used to input different materials into the reaction cylinder 31. A material outlet is arranged at the top of the reaction and separation integrated device 3; the material outlet is connected to the inlet of a production water tank 4;

[0026] The outlet of the production water tank 4 is connected to the suction inlet of the gas-liquid mixing pump 5. A gas suction nozzle is installed at the suction inlet of the gas-liquid mixing pump 5. A gas flow meter is installed at the front end of the gas suction nozzle. The end of the gas suction nozzle is used to connect to the steel plant flue gas. The steel plant flue gas is introduced into the gas-liquid mixing pump through the gas suction nozzle to form dissolved air water;

[0027] The outlet of the gas-liquid mixing pump 5 is connected to the inlet of the gas-liquid separation tank 6. The liquid phase outlet of the gas-liquid separation tank 6 is connected to the water distribution pipeline system 34.

[0028] Example 2:

[0029] Based on Example 1, the specific device operation method is introduced as follows:

[0030] The water quality indexes of the whole-plant comprehensive wastewater of a certain iron and steel enterprise are shown in Table 1. It can be seen that the hardness of the wastewater is as high as 800 mg / l, which is high-hardness wastewater.

[0031] Table 1 Wastewater quality index table

[0032] Serial number Item Unit Index Remarks 1 pH 6～9 2 SS mg / l 300 3 <![CDATA[COD cr > mg / l 60～150 4 <![CDATA[BOD5]]> mg / l 10～30 5 Oil mg / l ≤20 6 Total hardness mg / l 800 <![CDATA[Calculated as CaCO3]]> 7 Temporary hardness mg / l 60 <![CDATA[Calculated as CaCO3]]> 8 Total alkalinity mg / l 250 <![CDATA[Calculated as CaCO3]]> 9 Salt content mg / l 2000 10 <![CDATA[Cl - > mg / l 450

[0033] The device in Example 1 is used for wastewater treatment, including the following steps:

[0034] 1) The above-mentioned high-hardness wastewater is discharged into the reaction device, and calcium hydroxide is added to control the pH at about 10.0. At the same time, 25 mg / L of PAC (polyaluminum chloride) and 1.0 mg / L of PAM (polyacrylamide) are added. After stirring, a mixture liquid of CaCO3, Mg(OH)2, CaCl2 and water is generated by reaction.

[0035] The main reaction formulas are as follows:

[0036]

[0037] 2) The mixture liquid is sent into the reaction and separation integrated device. After the mixture liquid and the material from the water distribution pipeline system are mixed in the reaction cylinder to complete the reaction, the floating slag is removed through the floating slag hopper, and the separated liquid phase enters the production water tank.

[0038] 3) A part of the wastewater in the water production pool (flow rate is Q) meets the standard and is discharged or enters the next process, and the other part (flow rate 0.5Q) enters the gas-liquid mixing pump. A gas suction nozzle is installed at the suction port of the gas-liquid mixing pump, and a gas flow meter is installed in front of the gas suction nozzle to adjust and control the suction volume. The end of the gas suction nozzle is connected to the flue gas of the steel plant. The gas suction nozzle introduces the CO2-rich flue gas of the steel plant into the vicinity of the impeller of the pump, and with the help of the impeller, the gas is introduced into the blades of the pump for pressurized mixing, which can ensure that the CO2-rich flue gas of the steel plant and the wastewater (flow rate 0.5Q) at the inlet of the gas-liquid mixing pump are efficiently mixed and dissolved. At the same time, the high temperature of the flue gas (about 200℃) increases the temperature of the wastewater. Through this series of processes, the outlet of the gas-liquid mixing pump obtains dissolved gas (CO2) water with a water temperature of about 55℃ and a pressure of about 0.4MPa.

[0039] 4) The undissolved part of the gas injected into the gas-liquid mixing pump will form a gas pocket before the pressure is released, affecting the gas dissolving effect. Therefore, it is necessary to install a gas-liquid separation tank in the outlet pipeline of the gas-liquid mixing pump, and an automatic exhaust valve needs to be installed on the gas-liquid separation tank to discharge the undissolved part of the gas to avoid the formation of a gas pocket and affect the gas dissolving effect.

[0040] The dissolved gas (CO2) water in step 3) has a water temperature of about 55°C, and reacts with step 1) to form CaCO 3、 Mg(OH) 2、 The mixed liquid of CaCl2 and water enters the reaction and separation integrated device in step 2) together.

[0041] The bottom of the reaction and separation integrated device is a water distribution pipeline system, which reacts the dissolved gas (CO2) water with a water temperature of about 55°C in step 3) with step 1) to generate CaCO 3、 Mg(OH) 2、 The mixed liquid of CaCl2 and water is fully mixed and evenly distributed. The water distribution pipeline system needs to be designed according to the shape of the reaction cylinder. In this example, the reaction and separation integrated device adopts a cylindrical shape. The water distribution pipeline system adopts a vertical pipe directly installed at the conical bottom of the cylindrical reaction cylinder. The vertical pipe should be as short as possible, the pipe diameter should be larger than the diameter of the drainage pipe, and the vertical pipe mouth should face upward.

[0042] In the reaction tube of the reaction-separation integrated device, the dissolved gas (CO2) water with a water temperature of about 55°C in step 3) reacts with step 1) to generate a mixed liquid of CaCO3, Mg(OH)2, CaCl2 and water, which is fully mixed and evenly distributed through the water distribution pipeline system. The dissolved gas (CO2) water with a pressure of about 0.4MPa is released from the water distribution pipeline system and the pressure drops to a normal level. The CO2 gas dissolved in this process will be released in the form of many tiny bubbles (bubble diameter is about 20-30 microns). The CO2 bubbles have a small particle size, which greatly increases the contact reaction area and improves the reaction efficiency. The following reactions will occur efficiently in the reaction tube:

[0043]

[0044]

[0045] In addition, the introduction of 55°C dissolved air (CO2) water can increase the water temperature in the reaction tube to about 40°C. The increase in water temperature also greatly increases the reaction efficiency and reduces the hardness of the final water output.

[0046] Due to the weak acidity of carbonic acid, + 、CO3 2- When it is continuously consumed, the carbon dioxide dissolved in water can continue to produce CO3 2- , achieving almost the same effect as Na2CO3 softening.

[0047] In addition to the above chemical reactions taking place in the reaction tube, the CaCO generated in step 1) 3、 Mg(OH)2, and fine sediments such as CaCO3 produced in the reaction tube in this step adhere to the surface of tiny bubbles (bubble diameter is about 20-30 microns). These fine sediments will float to the water surface with the tiny bubbles to form scum. The scum is discharged through the scum bucket in the reaction and separation integrated device and finally sent to the sludge dewatering device.

[0048] In summary, in the reaction and separation integrated device, efficient reaction is achieved, and solid (CaCO3, Mg(OH)2 precipitates and suspended solids in wastewater, etc.) and liquid separation are simultaneously achieved. After reaction and separation, the hardness of the wastewater can be stably reduced to less than 20 mg / L, and the inlet and outlet water quality indicators are shown in Table 2 below.

[0049] Table 2 Comprehensive wastewater index table of the whole plant before and after treatment

[0050] Serial number Item Unit Influent water quality index Influent water quality index Remarks 1 pH 6～9 7～9 2 SS mg / l 300 ≤3 3 <![CDATA[COD cr > mg / l 60～150 ≤40 4 <![CDATA[BOD5]]> mg / l 10～30 ≤10 5 Oil mg / l ≤20 ≤2 6 Total hardness mg / l 800 ≤20 <![CDATA[Calculated as CaCO3]]> 7 Total alkalinity mg / l 250 ≤10 <![CDATA[Calculated as CaCO3]]>

[0051] Example 3

[0052] This embodiment introduces a specific device operation method based on embodiment 1, as follows:

[0053] The device in Example 1 is used to treat wastewater. The wastewater comes from the comprehensive wastewater of a steel enterprise. The total hardness of the wastewater is 500 mg / l in terms of CaCO3, the pH of the wastewater is 7-9, the SS is 200 mg / l, the COD is 60 mg / l, the BOD is 10 mg / l, the total alkalinity is 100 mg / l in terms of CaCO3, the salt content is 1000 mg / l, and the Cl content is 100 mg / l. The process specifically includes the following steps:

[0054] 1) Drain the above-mentioned highly-hard wastewater into a reaction device, add calcium hydroxide to control the pH at 10.5, and simultaneously add 10 mg / L of PAC (polyaluminum chloride) and 0.5 mg / L of PAM (polyacrylamide). After stirring, a mixed liquid of CaCO3, Mg(OH)2, CaCl2 and water is generated through reaction.

[0055] 2) Feed the mixed liquid into a reaction and separation integrated device. After the mixed liquid and the material from the water distribution pipeline system complete the reaction in the reaction cylinder, the floating slag is removed through a floating slag hopper, and the separated liquid phase enters the production water tank.

[0056] 3) A part of the wastewater in the production water tank (flow rate is Q) meets the standards and is discharged externally or enters the next process. Another part (flow rate 0.15Q) enters the gas-liquid mixing pump. A gas suction nozzle is installed at the suction port of the gas-liquid mixing pump, and a gas flow meter is installed in front of the gas suction nozzle to adjust and control the gas intake. The end of the gas suction nozzle is connected to the steel plant flue gas. The gas suction nozzle introduces the steel plant flue gas rich in CO2 near the impeller of the pump, and the impeller is used to introduce the gas into the blades of the pump for pressurized mixing, which can ensure the efficient mixing and dissolution of the steel plant flue gas rich in CO2 and the wastewater (flow rate 0.15Q) at the inlet of the gas-liquid mixing pump. At the same time, the high temperature of the flue gas (about 200 °C) raises the temperature of the wastewater. Through this series of processes, dissolved gas (CO2) water with a water temperature of about 60 °C and a pressure of about 0.5 MPa is obtained at the outlet of the gas-liquid mixing pump.

[0057] 4) Among the gases injected into the gas-liquid mixing pump, the undissolved part will form gas pockets before the pressure is released, affecting the dissolved gas effect. Therefore, a gas-liquid separation tank needs to be installed in the outlet pipeline of the gas-liquid mixing pump, and an automatic exhaust valve needs to be installed on the gas-liquid separation tank to discharge the undissolved part of the gas to avoid the formation of gas pockets and affecting the dissolved gas effect.

[0058] The dissolved gas (CO2) water with a water temperature of about 60 °C in step 3), reacts with CaCO 3、 Mg(OH) 2、 The mixed liquid of CaCl2 and water enters the reaction and separation integrated device in step 2) together.

[0059] The bottom of the reaction and separation integrated device is a water distribution pipeline system, which mixes the dissolved gas (CO2) water in step 3) with CaCO 3、 Mg(OH) 2、The mixed solution of CaCl2 and water is fully mixed to achieve uniform water distribution. The water distribution pipeline system needs to be designed according to the shape of the reaction cylinder. In this example, the reaction and separation integrated device is rectangular, so horizontal straight pipes are arranged in the air dissolution chamber of the reaction cylinder. The length of the straight pipe is 5 cm, an elbow is installed at the end of the straight pipe, the diameter of the elbow is 10 cm, and the elbow opens upward relative to the air dissolution chamber of the reaction cylinder to directly discharge the air dissolved water and wastewater.

[0060] In the reaction cylinder of the reaction and separation integrated device, the air dissolved (CO2) water in step 3) is fully mixed with the mixed solution of CaCO3, Mg(OH)2, CaCl2 and water generated in step 1) through the water distribution pipeline system to achieve uniform water distribution. After the air dissolved (CO2) water is released from the water distribution pipeline system, the pressure drops to the normal level, and the previously dissolved CO2 gas will be released in the form of many tiny bubbles (bubble diameter about 20 - 30 microns). Due to the tiny particle size of the CO2 bubbles, the contact reaction area is greatly increased, improving the reaction efficiency.

[0061] In addition, the introduction of the air dissolved (CO2) water raises the water temperature in the reaction cylinder to about 45°C. The increase in water temperature also greatly increases the reaction efficiency and reduces the hardness of the final effluent.

[0062] Due to the weak acid property of carbonic acid, when H + 、CO3 2- are continuously consumed, the carbon dioxide dissolved in water can continuously generate CO3 2- , achieving almost the same effect as Na2CO3 softening.

[0063] In addition to the above chemical reactions occurring in the reaction cylinder, the fine precipitates such as CaCO 3、 Mg(OH)2 generated in step 1) and the CaCO3 produced in the reaction cylinder in this step adhere to the surface of the tiny bubbles (bubble diameter about 20 - 30 microns). These fine precipitates will float to the water surface with the tiny bubbles to form scum, and the scum is discharged through the scum hopper in the reaction and separation integrated device and finally sent to the sludge dewatering device.

[0064] In summary, in the reaction and separation integrated device, efficient reaction is achieved, and solid (CaCO3, Mg(OH)2 precipitates and suspended solids in the wastewater, etc.) - liquid separation is synchronously realized. After reaction and separation, the hardness of the wastewater can be stably reduced to less than 20 mg / L.

[0065] Example 4

[0066] Based on Example 1, this example introduces the specific device operation method as follows:

[0067] The device in Example 1 is used for wastewater treatment. The wastewater source is the comprehensive wastewater of an iron and steel enterprise. The total hardness of the wastewater is 900 mg / l in terms of CaCO3, the pH of the wastewater is 6 - 7, the SS is 600 mg / l, the COD is 150 mg / l, the BOD is 30 mg / l, the total alkalinity is 300 mg / l in terms of CaCO3, the salt content is 2000 mg / l, and the Cl content is 500 mg / l. The specific steps are as follows:

[0068] 1) The above high-hardness wastewater is discharged into the reaction device, and calcium hydroxide is added to control the pH at 9.0. At the same time, 30 mg / L of PAC (polyaluminum chloride) and 3.0 mg / L of PAM (polyacrylamide) are added. After stirring, a mixed liquid of CaCO3, Mg(OH)2, CaCl2 and water is generated by reaction.

[0069] 2) The mixed liquid is sent to the reaction and separation integrated device. After the mixed liquid and the material from the water distribution pipeline are mixed in the reaction cylinder to complete the reaction, the floating slag is removed through the floating slag hopper, and the separated liquid phase enters the production water tank.

[0070] 3) A part of the wastewater in the production water tank (flow rate is Q) meets the standards and is discharged or enters the next process. Another part (flow rate 0.4Q) enters the gas-liquid mixing pump. A gas suction nozzle is installed at the suction port of the gas-liquid mixing pump, and a gas flow meter is installed in front of the gas suction nozzle to adjust and control the gas suction volume. The end of the gas suction nozzle is connected to the steel plant flue gas. The gas suction nozzle introduces the steel plant flue gas rich in CO2 near the impeller of the pump, and the impeller is used to introduce the gas into the blades of the pump for pressurized mixing, which can ensure the efficient mixing and dissolution of the steel plant flue gas rich in CO2 and the wastewater at the inlet of the gas-liquid mixing pump (flow rate 0.5Q). At the same time, the high temperature of the flue gas (about 200 °C) raises the temperature of the wastewater. Through this series of processes, the dissolved gas (CO2) water with a water temperature of about 50 °C and a pressure of about 0.3 MPa is obtained at the outlet of the gas-liquid mixing pump.

[0071] 4) Among the gases injected into the gas-liquid mixing pump, the undissolved part will form gas pockets before the pressure is released, affecting the dissolved gas effect. Therefore, a gas-liquid separation tank needs to be installed in the outlet pipeline of the gas-liquid mixing pump, and an automatic exhaust valve needs to be installed on the gas-liquid separation tank to discharge the undissolved part of the gas to avoid the formation of gas pockets and affecting the dissolved gas effect.

[0072] The dissolved gas (CO2) water in step 3), and the mixed liquid of CaCO 3、 Mg(OH) 2、 CaCl2 and water generated in step 1) enter the reaction and separation integrated device in step 2) together.

[0073] The bottom of the integrated reaction and separation device is a water distribution pipeline system, which mixes the dissolved gas (CO2) water in step 3) with the mixture of CaCO 3、 Mg(OH) 2、 CaCl2 and water in the mixture solution in step 1) fully and evenly distributes the water. The water distribution pipeline system needs to be designed according to the shape of the reaction cylinder. In this example, the integrated reaction and separation device uses a reaction cylinder with a large area for discharging the dissolved gas water. The water distribution pipeline is an assembled pipe formed by splicing two straight pipes into an H shape. The assembled pipe is drilled with holes with a diameter of 10-15 mm every 20-30 cm to discharge the dissolved gas water and wastewater.

[0074] In the reaction cylinder of the integrated reaction and separation device, the dissolved gas (CO2) water in step 3) is fully mixed with the mixture of CaCO3, Mg(OH)2, CaCl2 and water generated in step 1) through the water distribution pipeline system to achieve uniform water distribution. After the dissolved gas (CO2) water is released from the water distribution pipeline system, the pressure drops to the normal level, and the previously dissolved CO2 gas will be released in the form of many tiny bubbles (bubble diameter about 20-30 microns). Due to the tiny particle size of the CO2 bubbles, the contact reaction area is greatly increased, and the reaction efficiency is improved.

[0075] In addition, the introduction of the dissolved gas (CO2) water raises the water temperature in the reaction cylinder to about 40°C. The increase in water temperature also greatly increases the reaction efficiency and reduces the hardness of the final effluent.

[0076] Due to the weak acid property of carbonic acid, in the case of continuous consumption of H + and CO3 2- dissolved carbon dioxide in water can continuously generate CO3 2- to achieve almost the same softening effect as Na2CO3.

[0077] In addition to the above chemical reactions occurring in the reaction cylinder, the fine precipitates such as CaCO 3、 Mg(OH)2 generated in step 1) and CaCO3 produced in the reaction cylinder in this step adhere to the surface of the tiny bubbles (bubble diameter about 20-30 microns). These fine precipitates will float to the water surface with the tiny bubbles to form scum, and the scum is discharged through the scum hopper in the integrated reaction and separation device and finally sent to the sludge dewatering device.

[0078] In summary, in the integrated reaction and separation device, efficient reaction is achieved, and solid (CaCO3, Mg(OH)2 precipitates and suspended solids in the wastewater, etc.)-liquid separation is synchronously realized. After reaction and separation, the hardness of the wastewater can be stably reduced to less than 20 mg / L.

[0079] Comparative Example 1

[0080] A reaction-separation integrated device, compared with Example 1, is characterized in that it does not contain a water distribution pipeline system. Specifically, it includes a reaction cylinder arranged at the bottom of the reaction-separation integrated device and a scum hopper arranged at the top. A water distribution cylinder arranged above the reaction cylinder is sleeved and communicated with the reaction cylinder; the bottom of the reaction cylinder is communicated with a water inlet pipeline (a circular pipe with a diameter of 2 cm), and the water inlet pipeline is used to input different materials into the reaction cylinder. A material outlet is arranged at the top of the reaction-separation integrated device.

[0081] Furthermore, the device for reducing the hardness of wastewater includes a reaction device, the above-mentioned reaction-separation integrated device, a production water tank, a gas-liquid mixing pump, and a gas-liquid separation tank. Among them,

[0082] The reaction device is connected to a stirring device. The material outlet of the reaction device is connected to the reaction-separation integrated device. After the materials react in the reaction-separation integrated device, the materials that have completed the reaction enter the production water tank after removing scum through the scum hopper;

[0083] The water outlet of the production water tank is connected to the gas-liquid mixing pump. A gas suction nozzle is installed at the suction port of the gas-liquid mixing pump. A gas flowmeter is installed at the front end of the gas suction nozzle. The end of the gas suction nozzle is connected to the steel plant flue gas. The outlet of the gas-liquid mixing pump is connected to the gas-liquid separation tank. The liquid phase outlet of the gas-liquid separation tank is connected to the water inlet pipeline, and the dissolved air water is directly sent into the reaction cylinder through the water inlet pipeline.

[0084] Using the above device to treat wastewater according to the method in Example 2, and finally detecting a part of the effluent from the production water tank, it is found that the effect of reducing the hardness is general, and the hardness of the effluent water quality is 150 mg / L.

[0085] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principle and purpose of the present invention.

Claims

1. A reaction and separation integrated device, characterized in that: It includes a reaction cylinder arranged at the bottom and a scum bucket arranged at the top, a water distribution cylinder arranged above the reaction cylinder is sleeve-connected with the reaction cylinder; the bottom of the reaction cylinder is connected to a water distribution pipeline system, the water distribution pipeline system is used to input different materials into the reaction cylinder, and a material outlet is arranged on the top of the reaction and separation integrated device.

2. The reaction-separation integrated device according to claim 1, characterized in that: The central axis of the reaction cylinder coincides with the central axis of the integrated reaction and separation device and the central axis of the water distribution cylinder.

3. The reaction-separation integrated device according to claim 2, characterized in that: The upper end of the reaction cylinder is cylindrical and the lower end is conical, and the water distribution pipeline system includes at least one vertical pipe arranged at the conical bottom of the reaction cylinder, and the opening of the vertical pipe faces upward.

4. The reaction-separation integrated device according to claim 3, characterized in that: The length of the vertical pipe is 1-10 cm.

5. The reaction-separation integrated device according to claim 2, characterized in that: The reaction cylinder is rectangular, and a gas dissolving chamber is arranged in the reaction cylinder. Then the water distribution pipeline system includes at least one straight pipe arranged horizontally in the gas dissolving chamber.

6. The reaction-separation integrated device according to claim 5, characterized in that: The length of the straight tube is 1-10 cm, the end of the straight tube is connected to an elbow, and the elbow faces upward relative to the opening of the gas dissolution chamber.

7. The reaction-separation integrated device according to claim 6, characterized in that: The elbow has a diameter of 4-15 cm.

8. The reaction-separation integrated device according to claim 5, characterized in that: The length of the straight tube is greater than 10 cm, and holes with a diameter of 10-15 mm are drilled on the straight tube every 20-30 cm.

9. The reaction-separation integrated device according to claim 2, characterized in that: The water distribution pipeline system comprises two straight pipes spliced ​​into an H-shaped assembled pipe, and multiple holes are provided on the assembled pipe.

10. The reaction-separation integrated device according to claim 9, characterized in that: The assembling tube is provided with holes with a diameter of 10-15 mm at intervals of 20-30 cm.

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