Reaction device for dynamically treating electroplating wastewater

Abstract

The utility model provides a reaction device for dynamically treating electroplating wastewater, which is characterized by comprising an integrated reaction kettle, a reflux device and a waste gas absorption system, the integrated reaction kettle comprises a central guide cylinder, a central guide cylinder support frame, a baffle plate, a water inlet pipe, a chemical inlet pipe, a water outlet pipe, a discharge pipe, a gas inlet and a one-way valve; the reflux device comprises a reflux water inlet pipe, a reflux water outlet pipe and a reflux pump; the waste gas absorption system comprises an absorption tank, a pH probe, a baffle plate, a sprayer, a blow-down pipe, a dosing port, a gas inlet pipe, a gas outlet pipe, a circulating pipe and a vacuum jet pump. The electroplating wastewater treatment device not only can effectively treat electroplating wastewater, but also can realize resource utilization of waste gas.

Description

Technical Field

[0001] The utility model relates to a reaction device for electroplating wastewater, more specifically, to a reaction device for dynamically treating electroplating wastewater. Background Art

[0002] With the continuous promotion and implementation of the concept of green development in all walks of life, people's attention to the treatment and treatment of electroplating wastewater containing heavy metals is increasing. The treatment of electroplating wastewater mainly uses the redox method. The redox method is to add oxidants or reductants to cause redox reactions with toxic substances such as organic matter and heavy metal ions in electroplating wastewater, and convert toxic substances into non-toxic or slightly toxic substances. Heavy metal ions in electroplating wastewater generally exist in a complex state. By adding oxidants such as H2O2, NaClO, KMnO4, Cl2, etc., heavy metal ions can be converted from a complex state to a free state, and then removed by precipitation. The advantage of this method is that it can recover heavy metals, greatly reduce the concentration of heavy metal ions in the waste liquid, facilitate subsequent treatment, and greatly reduce sludge production.

[0003] Among many methods, the oxidation method by adding NaClO has the characteristics of fast reaction speed and simple process. However, the sodium hypochlorite oxidation method has some disadvantages, such as low removal efficiency, excessive addition of reagents, and waste of reagents; under acidic treatment conditions, chlorine is easily produced, which is harmful to the environment and life and health; at the same time, the sodium hypochlorite oxidation method produces a large amount of chlorine, and the common treatment method is to absorb chlorine in an absorption tower, resulting in the inability to realize the utilization value of chlorine and waste of resources. The purpose of the utility model is to solve the defects in the above-mentioned technology. Based on the NaClO oxidation technology for treating electroplating wastewater, a reaction device is provided, which effectively solves the problems of low removal efficiency and large reagent consumption of the NaClO oxidation method. At the same time, the reaction device has a complete waste gas collection and treatment system, which can effectively avoid the impact of waste gas on the environment and life and health while achieving standard discharge of effluent. While the waste gas absorption system absorbs chlorine, the sodium hypochlorite produced by the reaction can be recycled and re-added to the reaction device to realize the resource utilization of chlorine. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides a reaction device for dynamically treating electroplating wastewater, which adopts the following technical solutions:

[0005] A reaction device for dynamically treating electroplating wastewater, characterized in that it includes an integrated reactor, a reflux device and a waste gas absorption system, the integrated reactor includes a central guide tube, a central guide tube support frame, a baffle, a water inlet pipe, a drug inlet pipe, a water outlet pipe, a discharge pipe, an air inlet and a one-way valve; the reflux device includes a reflux inlet pipe, a reflux outlet pipe and a reflux pump; the waste gas absorption system includes an absorption tank, a pH probe, a baffle, a sprinkler, a vent pipe, a drug adding port, an air inlet pipe, an air outlet pipe, a circulation pipe and a vacuum jet pump.

[0006] Furthermore, the central flow guide tube support frame is used to support the central flow guide tube, and the number of the central flow guide tube support frames is determined according to the length of the central flow guide tube; the baffles are respectively arranged on the side walls of the central flow guide tube and the side walls of the integrated reactor, and the baffles on the side walls of the central flow guide tube and the baffles on the side walls of the integrated reactor are arranged alternately up and down in sequence; the water inlet pipe and the drug inlet pipe are arranged at the top of the integrated reactor, penetrating into the interior of the central flow guide tube; the water outlet pipe is located on the side wall of the integrated reactor; the discharge pipe is arranged at the bottom of the integrated reactor.

[0007] Furthermore, the reflux inlet pipe on the reflux device is connected to the side wall of the integrated reactor, slightly lower than the outlet pipe; the reflux outlet pipe on the reflux device is connected to the top of the integrated reactor, deep into the central guide tube.

[0008] Furthermore, the pH probe, air outlet pipe and dosing port are arranged above the absorption tank; the air outlet pipe is connected to the sprayer; baffles are arranged inside the absorption tank in parallel and staggered arrangement; a vent pipe is provided at the bottom of the absorption tank, and a vent valve is provided on the vent pipe.

[0009] Furthermore, the vacuum jet pump is arranged on the circulation pipe; the circulation pipe includes a circulation water inlet pipe and a circulation water outlet pipe, the circulation water inlet pipe is arranged at the bottom of the absorption tank, and the circulation water outlet pipe is connected to the top of the absorption tank; the air inlet pipe is connected to the circulation water outlet pipe from the top of the integrated reactor.

[0010] Compared with the prior art, the advantages of the present invention are:

[0011] (1) The device provides a dynamic reaction device for treating electroplating wastewater, which adds a reflux device, increases the reaction efficiency between wastewater and reagents, reduces reagent loss, and improves wastewater treatment effects;

[0012] (2) A baffle is added to the integrated reactor in the device. The baffle has a fan-shaped structure and has an impact stirring effect, which is beneficial to improving the efficiency of breaking the network, improving the wastewater treatment effect, and reducing sludge accumulation;

[0013] (3) The device is equipped with a waste gas absorption system to avoid the impact of waste gas on the environment and life and health. A sprinkler is added at the end to ensure that the gas emission meets the standard. The waste gas absorption system adds a reflux device and a baffle to improve the waste gas absorption efficiency. The chlorine gas generated in the reactor is treated by the waste gas absorption system to generate sodium hypochlorite which can be reused, realizing the resource utilization of waste gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Among them, 1-water inlet pipe, 2-drug inlet pipe, 3-reflux pump, 4-reflux pipe, 5-discharge pipe, 6-air inlet pipe, 7-water outlet pipe, 8-central guide tube support frame, 9-integrated reactor, 10-baffle, 11-central guide tube, 12-vacuum jet pump, 13-circulation pipe, 14-pH probe, 15-air outlet pipe, 16-sprinkler, 17-vent pipe, 18-vent valve, 19-drug adding port, 20-baffle, 21-absorption tank, 22-air inlet, 23-check valve, 24-reflux water inlet pipe, 25-reflux water outlet pipe, 26-circulation water inlet pipe, 27-circulation water outlet pipe. DETAILED DESCRIPTION

[0016] The utility model is further elaborated and illustrated below in conjunction with the accompanying drawings and specific implementation methods.

[0017] like Figure 1 As shown, the utility model provides a reaction device for dynamically treating electroplating wastewater, characterized in that it includes an integrated reactor 9, a reflux device and a waste gas absorption system, wherein the integrated reactor 9 includes a central guide tube 11, a central guide tube support frame 8, a baffle 10, an inlet pipe 1, a drug inlet pipe 2, a water outlet pipe 7, a discharge pipe 5, an air inlet 22 and a one-way valve 23; the reflux device includes a reflux inlet pipe 24, a reflux outlet pipe 25 and a reflux pump 3; the waste gas absorption system includes an absorption tank 21, a pH probe 14, a baffle 20, a sprinkler 16, a vent pipe 17, a dosing port 19, an air inlet pipe 6, an air outlet pipe 15, a circulation pipe 13 and a vacuum jet pump 12;

[0018] The central guide tube support frame 8 is used to support the central guide tube 11, and the number of the central guide tube support frames 8 is determined according to the length of the central guide tube 11; the baffles 10 are respectively arranged on the side walls of the central guide tube 11 and the side walls of the integrated reactor 9, and the baffles 10 on the side walls of the central guide tube 11 and the baffles 10 on the side walls of the integrated reactor 9 are arranged alternately up and down in sequence; the water inlet pipe 1 and the drug inlet pipe 2 are arranged at the top of the integrated reactor 9 and penetrate into the interior of the central guide tube 11; the water outlet pipe 7 is located on the side wall of the integrated reactor 9; the discharge pipe 5 is arranged at the bottom of the integrated reactor 9;

[0019] The reflux water inlet pipe 24 on the reflux device is connected to the side wall of the integrated reactor 9, slightly lower than the outlet pipe 7; the reflux water outlet pipe 25 on the reflux device is connected to the top of the integrated reactor 9, and penetrates into the central guide tube 11;

[0020] The pH probe 14, the air outlet pipe 15 and the dosing port 19 are arranged above the absorption tank 21; the air outlet pipe 15 is connected to the sprayer 16; the absorption tank 21 is provided with baffles 20, which are arranged in parallel and staggered up and down; the bottom of the absorption tank 21 is provided with a vent pipe 17, and the vent pipe 17 is provided with a vent valve 18;

[0021] The vacuum jet pump 12 is arranged on the circulation pipe 13; the circulation pipe 13 includes a circulation water inlet pipe 26 and a circulation water outlet pipe 27, the circulation water inlet pipe 26 is arranged at the bottom of the absorption tank 21, and the circulation water outlet pipe 27 is connected to the top of the absorption tank 21; the air inlet pipe 6 is connected to the circulation water outlet pipe 27 from the top of the integrated reactor 9.

[0022] The system's processing flow is as follows:

[0023] Electroplating wastewater enters the integrated reactor 9 through the water inlet pipe, and sodium hypochlorite enters the integrated reactor 9 through the drug inlet pipe 2 and the central guide tube 11 for oxidation reaction. At the same time, reflux is performed through the reflux device to avoid waste of reagents. The baffle 10 on the central guide tube 11 and the integrated reactor 9 is a fan-shaped structure, which has the function of guiding and promoting stirring, which is conducive to the full progress of the oxidation reaction and reduces sludge accumulation. The gas generated by the integrated reactor 9 is chlorine and hypochlorous acid. Under the action of the vacuum jet pump 12, the gas in the integrated reactor 9 enters the absorption tank 21 through the air inlet pipe. The absorption tank 21 is filled with alkali solution to absorb the waste gas. The chlorine reacts with the alkali solution to generate sodium hypochlorite, which can be discharged through the vent pipe 18 and then enter the integrated reactor 9 through the drug inlet pipe 2. The remaining gas is discharged through the outlet pipe 15 and is absorbed twice by the sprayer 16. At the same time, the pH probe 14 is used to feedback the use of the alkali solution, and the dosing port 19 is used to replenish the alkali solution.

[0024] The utility model provides a reaction device, which effectively solves the problems of low removal efficiency and large reagent consumption of the NaClO oxidation method. At the same time, the reaction device has a complete waste gas collection and treatment system, which can effectively avoid the impact of waste gas on the environment and life and health while achieving standard discharge of effluent. While the waste gas absorption system absorbs chlorine, the sodium hypochlorite produced by the reaction can be recycled and added back to the reaction device to realize the resource utilization of chlorine. Example

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.

[0026] A reaction device for dynamic treatment of electroplating wastewater was trial-produced using the above technical solution. Figure 1 As shown, the treatment object is the electroplating rinse water of a certain electroplating wastewater treatment plant which needs to be oxidized and decomposed.

[0027] The system comprises a water inlet pipe 1, a drug inlet pipe 2, a reflux pump 3, a reflux pipe 4, a discharge pipe 5, an air inlet pipe 6, a water outlet pipe 7, a central guide tube support frame 8, an integrated reactor 9, a baffle 10, a central guide tube 11, a vacuum jet pump 12, a circulation pipe 13, a pH probe 14, an air outlet pipe 15, a sprinkler 16, a vent pipe 17, a vent valve 18, a drug adding port 19, a baffle 20, an absorption tank 21, an air inlet 22, a one-way valve 23, a reflux water inlet pipe 24, a reflux water outlet pipe 25, a circulation water inlet pipe 26, and a circulation water outlet pipe 27.

[0028] The device comprises an integrated reactor 9, a reflux device and a waste gas absorption system, wherein the integrated reactor 9 comprises a central guide tube 11, a central guide tube support frame 8, a baffle 10, a water inlet pipe 1, a drug inlet pipe 2, a water outlet pipe 7, a discharge pipe 5, an air inlet 22 and a one-way valve 23; the reflux device comprises a reflux water inlet pipe 24, a reflux water outlet pipe 25 and a reflux pump 3; the waste gas absorption system comprises an absorption tank 21, a pH probe 14, a baffle 20, a sprinkler 16, a vent pipe 17, a drug adding port 19, an air inlet pipe 6, an air outlet pipe 15, a circulation pipe 13 and a vacuum jet pump 12;

[0029] The central guide tube support frame 8 is used to support the central guide tube 11, and the number of the central guide tube support frames 8 is determined according to the length of the central guide tube 11; the baffles 10 are respectively arranged on the side walls of the central guide tube 11 and the side walls of the integrated reactor 9, and the baffles 10 on the side walls of the central guide tube 11 and the baffles 10 on the side walls of the integrated reactor 9 are arranged alternately up and down in sequence; the water inlet pipe 1 and the drug inlet pipe 2 are arranged at the top of the integrated reactor 9 and penetrate into the interior of the central guide tube 11; the water outlet pipe 7 is located on the side wall of the integrated reactor 9; the discharge pipe 5 is arranged at the bottom of the integrated reactor 9;

[0030] The reflux water inlet pipe 24 on the reflux device is connected to the side wall of the integrated reactor 9, slightly lower than the outlet pipe 7; the reflux water outlet pipe 25 on the reflux device is connected to the top of the integrated reactor 9, and penetrates into the central guide tube 11;

[0031] The pH probe 14, the air outlet pipe 15 and the dosing port 19 are arranged above the absorption tank 21; the air outlet pipe 15 is connected to the sprayer 16; the absorption tank 21 is provided with baffles 20, which are arranged in parallel and staggered up and down; the bottom of the absorption tank 21 is provided with a vent pipe 17, and the vent pipe 17 is provided with a vent valve 18;

[0032] The vacuum jet pump 12 is arranged on the circulation pipe 13; the circulation pipe 13 includes a circulation water inlet pipe 26 and a circulation water outlet pipe 27, the circulation water inlet pipe 26 is arranged at the bottom of the absorption tank 21, and the circulation water outlet pipe 27 is connected to the top of the absorption tank 21; the air inlet pipe 6 is connected to the circulation water outlet pipe 27 from the top of the integrated reactor 9.

[0033] The electroplating rinse water that needs to be oxidized and decomposed is treated by a dynamic reaction device for treating electroplating wastewater. After the dosing reaction and lime precipitation, the heavy metals in the effluent meet the emission standards in Table 3 of the "Emission Standards for Electroplating Pollutants" (GB21900 2008).

[0034] The above-described embodiments are only used to illustrate one implementation method of the utility model, rather than to limit it. It should be pointed out that a person skilled in the art may modify the technical solutions described in the above-described embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by a person skilled in the art without making creative efforts are within the protection scope of the utility model.

Claims

1. A reaction device for dynamically treating electroplating wastewater, characterized in that: It includes an integrated reactor, a reflux device and a waste gas absorption system. The integrated reactor includes a central guide tube, a central guide tube support frame, a baffle, a water inlet pipe, a drug inlet pipe, a water outlet pipe, a discharge pipe, an air inlet and a one-way valve; the reflux device includes a reflux inlet pipe, a reflux outlet pipe and a reflux pump; the waste gas absorption system includes an absorption tank, a pH probe, a baffle, a sprinkler, a vent pipe, a drug adding port, an air inlet pipe, an air outlet pipe, a circulation pipe and a vacuum jet pump.

2. A reaction device for dynamically treating electroplating wastewater according to claim 1, characterized in that: The central flow guide tube support frame is used to support the central flow guide tube, and the number of the central flow guide tube support frames is determined according to the length of the central flow guide tube; the baffles are respectively arranged on the side walls of the central flow guide tube and the side walls of the integrated reactor, and the baffles on the side walls of the central flow guide tube and the baffles on the side walls of the integrated reactor are arranged alternately up and down in sequence; the water inlet pipe and the drug inlet pipe are arranged at the top of the integrated reactor and penetrate into the interior of the central flow guide tube; the water outlet pipe is located on the side wall of the integrated reactor; the discharge pipe is arranged at the bottom of the integrated reactor.

3. A reaction device for dynamically treating electroplating wastewater according to claim 1, characterized in that: The reflux water inlet pipe on the reflux device is connected to the side wall of the integrated reactor, slightly lower than the outlet pipe; the reflux water outlet pipe on the reflux device is connected to the top of the integrated reactor, and penetrates into the interior of the central guide tube.

4. A reaction device for dynamically treating electroplating wastewater according to claim 1, characterized in that: The pH probe, air outlet pipe and dosing port are arranged above the absorption tank; the air outlet pipe is connected to the sprayer; baffles are arranged inside the absorption tank, which are arranged in parallel and staggered up and down; a vent pipe is arranged at the bottom of the absorption tank, and a vent valve is provided on the vent pipe.

5. The reaction device for dynamically treating electroplating wastewater according to claim 1 is characterized in that: The vacuum jet pump is arranged on the circulation pipe; the circulation pipe includes a circulation water inlet pipe and a circulation water outlet pipe, the circulation water inlet pipe is arranged at the bottom of the absorption tank, and the circulation water outlet pipe is connected to the top of the absorption tank; the air inlet pipe is connected to the circulation water outlet pipe from the top of the integrated reactor.

Images