A device for automatic dosing and treatment of sodium hypochlorite for chemical nickel wastewater and resource recycling of waste gas

Abstract

The utility model provides a kind of chemical nickel wastewater sodium hypochlorite automatic control dosing treatment and waste gas resource recycling device, it is characterized in that, including reaction device and waste gas resource device;The device innovatively combines ORP automatic control dosing unit, reaction unit and waste gas absorption recycling unit organically, and constructs the collaborative treatment process of "oxidation-absorption-recycling". While being equipped with full-process automatic control unit, it significantly improves the processing efficiency and stability, while reducing operating cost and secondary pollution risk. The complete set of device is suitable for the advanced treatment and waste gas treatment of various chemical nickel plating wastewater and refractory complex heavy metal wastewater, and provides an efficient, economical and environmentally friendly solution for achieving collaborative control and resource recovery of industrial pollutants.

Description

Technical Field

[0001] This utility model relates to the field of industrial wastewater and waste gas treatment technology, and more specifically, to a device for the automatic dosing treatment of sodium hypochlorite in chemical nickel wastewater and the resource recovery and reuse of waste gas. Background Technology

[0002] Electroless nickel plating wastewater contains a large amount of complexing agents and ammonia, resulting in a complex composition characterized by high COD, high ammonia nitrogen, high phosphorus, and high nickel. This type of wastewater poses serious environmental hazards; nickel is carcinogenic, phosphorus can cause eutrophication, and ammonia nitrogen may convert into nitrosamines. The stable complexes formed by nickel and complexing agents make traditional neutralization and precipitation processes ineffective, preventing compliance with emission standards. With the implementation of the "Electroplating Pollutant Discharge Standard" (GB21900-2008), efficient complex breaking and nickel removal has become crucial. Traditional hydroxide precipitation methods have limited effectiveness, while ion exchange and membrane filtration technologies are costly and complex to operate. Although sodium hypochlorite oxidation shows promise in complex breaking and nickel removal, existing dosing systems generally suffer from imprecise control, reliance on manual labor, and waste of reagents. Furthermore, the chlorine-containing waste gas generated during the reaction easily causes secondary pollution and resource waste.

[0003] To address the aforementioned technical bottlenecks, there is an urgent need to develop an integrated treatment device capable of precise reagent dosing, efficient pollutant removal, and simultaneous waste gas resource recovery and automated system operation. Based on this, this invention proposes a device for the automated sodium hypochlorite dosing treatment and waste gas resource recovery and reuse of chemical nickel wastewater. This device innovatively combines an ORP automated dosing unit, a reaction unit, and a waste gas absorption and reuse unit, constructing a synergistic treatment process of "oxidation-absorption-reuse." Specifically, the device first precisely adds sodium hypochlorite through an online ORP monitoring and automated control system, ensuring efficient complex breaking and nickel removal while avoiding reagent waste. The chlorine-containing waste gas generated during the treatment process is collected and introduced into an absorption tank, where it is converted into a reusable sodium hypochlorite solution through a circulating absorption reaction. The generated sodium hypochlorite solution can be returned to the dosing system, achieving resource recovery and recycling of the waste gas. The device is also equipped with a fully automated control unit, significantly improving treatment efficiency and stability while reducing operating costs and the risk of secondary pollution. The entire system is suitable for the deep treatment of various chemical nickel plating wastewater and recalcitrant complexed heavy metal wastewater, as well as the treatment of waste gas, providing an efficient, economical, and environmentally friendly solution for the synergistic control of industrial pollutants and resource recovery. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides an automated sodium hypochlorite dosing treatment device for chemical nickel wastewater and a waste gas resource recovery and reuse device, which adopts the following technical solution: The device includes a reaction unit and a waste gas resource recovery unit; The reaction apparatus includes an integrated reactor and a circulation device; The waste gas resource recovery device includes an absorption tank; The exhaust pipe of the integrated reactor is connected to the absorption tank via an induced draft fan; the absorption tank is connected to the sodium hypochlorite dosing pipe of the integrated reactor via a vent pipe, and the vent pipe is also equipped with a vent pump.

[0005] Furthermore, the integrated reactor is equipped with an inlet pipe, a sodium hypochlorite dosing pipe, a hydrochloric acid dosing pipe, a liquid alkali dosing pipe, a drain pipe, an outlet pipe, an exhaust pipe, a one-way valve, and a stirrer; the circulation device consists of a circulation pump, a circulation pipe, and a flow cup; the inlet end of the circulation pipe is connected above the integrated reactor and below the outlet pipe, and the outlet end is connected to the bottom of the integrated reactor; the circulation pump and the flow cup are connected in series on the circulation pipe; a first pH probe and a first ORP probe for monitoring reaction system parameters are installed on the flow cup.

[0006] Furthermore, the water inlet pipe is equipped with a water inlet pump, the sodium hypochlorite dosing pipe is equipped with a sodium hypochlorite dosing pump, the hydrochloric acid dosing pipe is equipped with a hydrochloric acid dosing pump, and the liquid alkali dosing pipe is equipped with a liquid alkali dosing pump.

[0007] Furthermore, the inlet pipe and the outlet pipe are located at the bottom of the integrated reactor; the agitator, the one-way valve, and the exhaust pipe are located at the top of the integrated reactor; and the outlet pipe is located on one side of the integrated reactor.

[0008] Furthermore, the first pH probe is electrically connected to the hydrochloric acid dosing pump and the liquid alkali dosing pump, and the first ORP probe is electrically connected to the sodium hypochlorite dosing pump, thus forming a self-controlled dosing system.

[0009] Furthermore, the absorption tank of the waste gas resource recovery device is equipped with a second pH probe, a second ORP probe, an absorbent replenishment port, and a vent pipe; the second pH probe, the second ORP probe, and the absorbent replenishment port are located at the top of the absorption tank, and the vent pipe is located at the bottom of the side wall of the absorption tank.

[0010] Furthermore, the second pH probe in the absorption tank is used to monitor the pH value of the absorption liquid, the second ORP probe is used to monitor the ORP value of the absorption liquid, and the second ORP probe is electrically connected to the venting pump to control the discharge of the absorption product.

[0011] Furthermore, the integrated reactor and absorption tank are made of corrosion-resistant material, which is PP or carbon steel lined with PTFE sheet.

[0012] Furthermore, the circulating cup is made of plexiglass.

[0013] Compared with existing technologies, the advantages of this utility model are: (1) The integrated intelligent dosing reaction achieves multiple optimizations through automated control technology. This device adopts ORP automatic dosing technology to precisely control the sodium hypochlorite dosage, improve reagent utilization, and reduce reagent consumption by 20-25%. Fully automated operation requires no manual monitoring, significantly reducing labor costs. (1) This device can ensure that the treated effluent consistently meets the requirements of Table 3 of the National Standard for Electroplating Pollutant Discharge (GB21900-2008), especially the control of heavy metal indicators; (2) High space efficiency, compact device structure, greatly saving the building area; convenient operation, simplified process flow, and easy operation. (3) This device is equipped with a dual mixing device of reflux and mechanical stirring. The reflux device realizes hydraulic circulation homogenization, and the mechanical stirring provides dynamic mixing, ensuring that the reaction system always maintains the best mixing state. This not only enhances the mass transfer effect, but also avoids local reaction blind spots, and increases the reaction completeness to 95%, making the treatment process more efficient, economical and stable. (4) It achieves synergistic optimization of waste gas treatment and reagent regeneration. The chlorine gas generated during the reaction is treated by a high-efficiency waste gas absorption device and can be converted into sodium hypochlorite solution with oxidizing effect. Through the intelligent control system, the regenerated sodium hypochlorite is returned to the reactor, realizing 100% resource conversion of waste gas pollutants. Furthermore, the operating cost is significantly reduced through material recycling. The reagent reuse rate can reach 30-40%, realizing the resource reuse of waste gas. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; The components are as follows: 1-Integrated reactor, 2-Agitator, 3-One-way valve, 4-Circulation pipe, 5-First pH probe, 6-First ORP probe, 7-Circulation pump, 8-Flow cup, 9-Outlet pipe, 10-Exhaust pipe, 11-Exhaust fan, 12-Second pH probe, 13-Second ORP probe, 14-Absorption tank, 15-Vent pump, 16-Sodium hypochlorite dosing pipe, 17-Hydrochloric acid dosing pipe, 18-Liquid alkali dosing pipe, 19-Inlet pipe, 20-Vent pipe, 21-Vent pipe, 22-Sodium hypochlorite dosing pump, 23-Hydrochloric acid dosing pump, 24-Liquid alkali dosing pump, 25-Absorbent replenishment port, 26-Inlet pump. Detailed Implementation

[0015] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments.

[0016] As shown in the figure, this utility model provides a device for the automatic dosing treatment of sodium hypochlorite in chemical nickel wastewater and the recycling of waste gas, characterized in that it includes a reaction device and a waste gas recycling device. The reaction apparatus includes an integrated reactor 1 and a circulation device; The waste gas resource recovery device includes an absorption tank 14; The exhaust pipe 10 of the integrated reactor 1 is connected to the absorption tank 14 via an induced draft fan 11; the absorption tank 14 is connected to the sodium hypochlorite dosing pipe 16 of the integrated reactor 1 via a vent pipe 21, and a vent pump 15 is also provided on the vent pipe 21.

[0017] The integrated reactor 1 is equipped with an inlet pipe 19, a sodium hypochlorite dosing pipe 16, a hydrochloric acid dosing pipe 17, a liquid alkali dosing pipe 18, a drain pipe 20, an outlet pipe 9, an exhaust pipe 10, a one-way valve 3, and a stirrer 2. The circulation device consists of a circulation pump 7, a circulation pipe 4, and a flow cup 8. The inlet end of the circulation pipe 4 is connected above the integrated reactor 1 and below the outlet pipe 9, and the outlet end is connected to the bottom of the integrated reactor 1. The circulation pump 7 and the flow cup 8 are connected in series on the circulation pipe 4. The flow cup 8 is equipped with a first pH probe 5 and a first ORP probe 6 for monitoring the parameters of the reaction system.

[0018] The water inlet pipe 19 is equipped with a water inlet pump 26, the sodium hypochlorite dosing pipe 16 is equipped with a sodium hypochlorite dosing pump 22, the hydrochloric acid dosing pipe 17 is equipped with a hydrochloric acid dosing pump 23, and the liquid alkali dosing pipe 18 is equipped with a liquid alkali dosing pump 24.

[0019] The inlet pipe 19 and the outlet pipe 20 are located at the bottom of the integrated reactor 1; the agitator 2, the one-way valve 3 and the exhaust pipe 10 are located at the top of the integrated reactor 1; and the outlet pipe 9 is located on one side of the integrated reactor 1.

[0020] The first pH probe 5 is electrically connected to the hydrochloric acid dosing pump 23 and the liquid alkali dosing pump 24, and the first ORP probe 6 is electrically connected to the sodium hypochlorite dosing pump 22, thus forming an automatic dosing system.

[0021] The absorption tank 14 of the waste gas resource recovery device is equipped with a second pH probe 12, a second ORP probe 13, an absorption liquid replenishment port 25, and a vent pipe 21; the second pH probe 12, the second ORP probe 13, and the absorption liquid replenishment port 25 are located at the top of the absorption tank 14, and the vent pipe 21 is located at the bottom of the side wall of the absorption tank 14.

[0022] The second pH probe 12 in the absorption tank 14 is used to monitor the pH value of the absorption liquid, and the second ORP probe 13 is used to monitor the ORP value of the absorption liquid. The second ORP probe 13 is electrically connected to the venting pump 15 to control the discharge of the absorption product.

[0023] The integrated reactor 1 and absorption tank 14 are made of corrosion-resistant material, which is PP or carbon steel lined with PTFE.

[0024] The circulating cup 8 is made of plexiglass.

[0025] The treatment process of the device is as follows: Chemical nickel wastewater is fed into the integrated reactor 1 via inlet pipe 19 and inlet pump 26. Here, a self-controlled dosing system consisting of a first pH probe 5, a first ORP probe 6, a sodium hypochlorite dosing pump 22, a hydrochloric acid dosing pump 23, and a liquid alkali dosing pump 24 precisely adds sodium hypochlorite, hydrochloric acid, or liquid alkali to ensure the reaction system is under optimal pH and ORP conditions, thereby efficiently breaking down the complex and removing nickel. A mixer 2 thoroughly mixes the wastewater and reagents. The chlorine-containing waste gas generated during the reaction is sent to the absorption tank 14 of the waste gas resource recovery device via the exhaust pipe 10 at the top and the induced draft fan 11. Inside the absorption tank 14, chlorine-containing waste gas comes into full contact with the alkaline absorbent liquid, where the effective chlorine is absorbed and reconstituted into sodium hypochlorite solution. This process is monitored in real time by the second pH probe 12 and the second ORP probe 13. When the pH of the absorbent liquid is too low or the ORP reaches the set range, alkaline solution can be added through the absorbent liquid replenishment port 25 to maintain absorption efficiency. Simultaneously, the vent pump 15, interlocked with the second ORP probe 13, pumps the regenerated sodium hypochlorite solution back to the sodium hypochlorite dosing pipe 16 of the integrated reactor through the vent pipe 21, achieving reagent recycling. Meanwhile, to maintain uniform water quality and reaction rate within the reactor, the circulation pump 7 draws wastewater from the integrated reactor 1, transports it through the circulation pipe 4 to the flow cup 8 for real-time probe monitoring, and finally returns it from the bottom of the integrated reactor 1, forming a forced circulation. The treated clean water is finally discharged through the effluent pipe 9, and the vent pipe 20 at the bottom of the integrated reactor 1 is used for system venting. The materials used in the entire device (such as PP or carbon steel lined with PTFE) and the acrylic material of the flow cup ensure its long-term stable operation in highly corrosive environments.

[0026] This invention innovatively combines an ORP (Optical Reduction Program) automated dosing unit, a reaction unit, and a waste gas absorption and reuse unit to construct a synergistic treatment process of "oxidation-absorption-reuse." It is also equipped with a fully automated control unit, significantly improving treatment efficiency and stability while reducing operating costs and the risk of secondary pollution. The entire system is suitable for the deep treatment and waste gas treatment of various types of chemical nickel plating wastewater and recalcitrant complexed heavy metal wastewater, providing an efficient, economical, and environmentally friendly solution for the synergistic control and resource recovery of industrial pollutants. Example

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0028] A device for the automated dosing treatment of sodium hypochlorite in chemical nickel wastewater and the resource recovery and reuse of waste gas was trial-produced using the above technical solution. Figure 1 .

[0029] The device includes an integrated reactor 1, a stirrer 2, a one-way valve 3, a circulation pipe 4, a first pH probe 5, a first ORP probe 6, a circulation pump 7, a flow cup 8, a water outlet pipe 9, an exhaust pipe 10, an induced draft fan 11, a second pH probe 12, a second ORP probe 13, an absorption tank 14, a venting pump 15, a sodium hypochlorite dosing pipe 16, a hydrochloric acid dosing pipe 17, a liquid alkali dosing pipe 18, a water inlet pipe 19, a drain pipe 20, a venting pipe 21, a sodium hypochlorite dosing pump 22, a hydrochloric acid dosing pump 23, a liquid alkali dosing pump 24, an absorption liquid replenishment port 25, and a water inlet pump 26.

[0030] The device includes a reaction unit and a waste gas resource recovery unit; The reaction apparatus includes an integrated reactor 1 and a circulation device; The waste gas resource recovery device includes an absorption tank 14; The exhaust pipe 10 of the integrated reactor 1 is connected to the absorption tank 14 via an induced draft fan 11; the absorption tank 14 is connected to the sodium hypochlorite dosing pipe 16 of the integrated reactor 1 via a vent pipe 21, and a vent pump 15 is also provided on the vent pipe 21.

[0031] The integrated reactor 1 is equipped with an inlet pipe 19, a sodium hypochlorite dosing pipe 16, a hydrochloric acid dosing pipe 17, a liquid alkali dosing pipe 18, a drain pipe 20, an outlet pipe 9, an exhaust pipe 10, a one-way valve 3, and a stirrer 2. The circulation device consists of a circulation pump 7, a circulation pipe 4, and a flow cup 8. The inlet end of the circulation pipe 4 is connected above the integrated reactor 1 and below the outlet pipe 9, and the outlet end is connected to the bottom of the integrated reactor 1. The circulation pump 7 and the flow cup 8 are connected in series on the circulation pipe 4. The flow cup 8 is equipped with a first pH probe 5 and a first ORP probe 6 for monitoring the parameters of the reaction system.

[0032] The water inlet pipe 19 is equipped with a water inlet pump 26, the sodium hypochlorite dosing pipe 16 is equipped with a sodium hypochlorite dosing pump 22, the hydrochloric acid dosing pipe 17 is equipped with a hydrochloric acid dosing pump 23, and the liquid alkali dosing pipe 18 is equipped with a liquid alkali dosing pump 24.

[0033] The inlet pipe 19 and the outlet pipe 20 are located at the bottom of the integrated reactor 1; the agitator 2, the one-way valve 3 and the exhaust pipe 10 are located at the top of the integrated reactor 1; and the outlet pipe 9 is located on one side of the integrated reactor 1.

[0034] The first pH probe 5 is electrically connected to the hydrochloric acid dosing pump 23 and the liquid alkali dosing pump 24, and the first ORP probe 6 is electrically connected to the sodium hypochlorite dosing pump 22, thus forming an automatic dosing system.

[0035] The absorption tank 14 of the waste gas resource recovery device is equipped with a second pH probe 12, a second ORP probe 13, an absorption liquid replenishment port 25, and a vent pipe 21; the second pH probe 12, the second ORP probe 13, and the absorption liquid replenishment port 25 are located at the top of the absorption tank 14, and the vent pipe 21 is located at the bottom of the side wall of the absorption tank 14.

[0036] The second pH probe 12 in the absorption tank 14 is used to monitor the pH value of the absorption liquid, and the second ORP probe 13 is used to monitor the ORP value of the absorption liquid. The second ORP probe 13 is electrically connected to the venting pump 15 to control the discharge of the absorption product.

[0037] The integrated reactor 1 and absorption tank 14 are made of corrosion-resistant material, which is PP or carbon steel lined with PTFE.

[0038] The circulating cup 8 is made of plexiglass.

[0039] Using this device for automated dosing, the total nickel content in electroless nickel plating wastewater can be reduced from 200 mg / L to 0.3 mg / L, ammonia nitrogen content from 800 mg / L to below 15 mg / L, and total phosphorus content from 2000 mg / L to below 8 mg / L. The effluent quality consistently meets the requirements of Zhejiang Province's "Electroplating Wastewater Pollutant Discharge Standard" (DB33 / 2260-2020) (nickel <0.3 mg / L, ammonia nitrogen <15.0 mg / L), and the total phosphorus meets the requirements of Zhejiang Province's "Indirect Discharge Limits for Nitrogen and Phosphorus Pollutants in Industrial Wastewater" (DB33 / 887-2013) (total phosphorus <8.0 mg / L). This significantly improves the utilization rate of sodium hypochlorite and enhances economic benefits.

[0040] The above-described embodiments are merely illustrative of one implementation of this utility model and are not intended to limit it. It should be noted that those skilled in the art can modify the technical solutions described in the above embodiments or make equivalent substitutions for some or all of the technical features; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the protection scope of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

Claims

1. A device for the automated dosing treatment of sodium hypochlorite in chemical nickel wastewater and the resource recovery and reuse of waste gas, characterized in that, Including reaction equipment and waste gas resource recovery equipment; The reaction apparatus includes an integrated reactor (1) and a circulation device; The waste gas resource recovery device includes an absorption tank (14). The exhaust pipe (10) of the integrated reactor (1) is connected to the absorption tank (14) via an induced draft fan (11); the absorption tank (14) is connected to the sodium hypochlorite dosing pipe (16) of the integrated reactor (1) via a vent pipe (21), and the vent pipe (21) is also equipped with a vent pump (15).

2. The device for automated sodium hypochlorite dosing treatment of chemical nickel wastewater and resource recovery of waste gas according to claim 1, characterized in that, The integrated reactor (1) is equipped with an inlet pipe (19), a sodium hypochlorite dosing pipe (16), a hydrochloric acid dosing pipe (17), a liquid alkali dosing pipe (18), an vent pipe (20), an outlet pipe (9), an exhaust pipe (10), a check valve (3), and a stirrer (2). The circulation device consists of a circulation pump (7), a circulation pipe (4), and a flow cup (8). The inlet end of the circulation pipe (4) is connected above the integrated reactor (1) and below the outlet pipe (9), and the outlet end is connected to the bottom of the integrated reactor (1). The circulation pump (7) and the flow cup (8) are connected in series on the circulation pipe (4). The flow cup (8) is equipped with a first pH probe (5) and a first ORP probe (6) for monitoring the parameters of the reaction system.

3. The device for automated sodium hypochlorite dosing treatment and waste gas resource recovery of chemical nickel wastewater according to claim 2, characterized in that, The water inlet pipe (19) is equipped with a water inlet pump (26), the sodium hypochlorite dosing pipe (16) is equipped with a sodium hypochlorite dosing pump (22), the hydrochloric acid dosing pipe (17) is equipped with a hydrochloric acid dosing pump (23), and the liquid alkali dosing pipe (18) is equipped with a liquid alkali dosing pump (24).

4. The device for automated sodium hypochlorite dosing treatment of chemical nickel wastewater and resource recovery of waste gas according to claim 2, characterized in that, The inlet pipe (19) and the outlet pipe (20) are located at the bottom of the integrated reactor (1); the agitator (2), the one-way valve (3) and the exhaust pipe (10) are located at the top of the integrated reactor (1); and the outlet pipe (9) is located on one side of the integrated reactor (1).

5. The device for automated sodium hypochlorite dosing treatment of chemical nickel wastewater and resource recovery and reuse of waste gas according to claim 3, characterized in that, The first pH probe (5) is electrically connected to the hydrochloric acid dosing pump (23) and the liquid alkali dosing pump (24), and the first ORP probe (6) is electrically connected to the sodium hypochlorite dosing pump (22), thus forming a self-controlled dosing system.

6. The device for automated sodium hypochlorite dosing treatment and waste gas resource recovery of chemical nickel wastewater according to claim 1, characterized in that, The absorption tank (14) of the waste gas resource recovery device is equipped with a second pH probe (12), a second ORP probe (13), an absorption liquid replenishment port (25), and a vent pipe (21); the second pH probe (12), the second ORP probe (13), and the absorption liquid replenishment port (25) are located at the top of the absorption tank (14), and the vent pipe (21) is located at the bottom of the side wall of the absorption tank (14).

7. The device for automated sodium hypochlorite dosing treatment and waste gas resource recovery of chemical nickel wastewater according to claim 6, characterized in that, The second pH probe (12) in the absorption tank (14) is used to monitor the pH value of the absorption liquid, and the second ORP probe (13) is used to monitor the ORP value of the absorption liquid. The second ORP probe (13) is electrically connected to the venting pump (15) to control the discharge of the absorption product.

8. The device for automated sodium hypochlorite dosing treatment of chemical nickel wastewater and resource recovery of waste gas according to claim 1, characterized in that, The integrated reactor (1) and absorption tank (14) are made of corrosion-resistant material, which is PP or carbon steel lined with PTFE plate.

9. The device for automated sodium hypochlorite dosing treatment of chemical nickel wastewater and resource recovery of waste gas according to claim 2, characterized in that, The circulating cup (8) is made of plexiglass.

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