Zinc-nickel wastewater treatment device

Abstract

The utility model provides a zinc-nickel wastewater treatment device which is characterized by comprising an acid regulation reaction tank, a denitrification complex breaking reactor, an oxidation reaction tank, a pH regulation tank and a sedimentation tank which are sequentially connected along the direction of a wastewater treatment process, a water inlet pipe is arranged on one side of the acid adjusting reaction tank; a water outlet pipe is arranged at the upper part of the sedimentation tank; a mud bucket is arranged at the bottom of the sedimentation tank, and a mud discharge hole is formed in the center of the mud bucket; an acid regulating tank lifting pump is arranged between the acid regulating reaction tank and the denitrification complex breaking reactor. The system can effectively solve the problems of high treatment cost, large occupied area, complex operation, environmental unfriendliness and the like while efficiently treating pollutants.

Description

Technical Field

[0001] The utility model relates to a wastewater treatment device, more specifically, to a zinc-nickel wastewater treatment device. Technical Background

[0002] Zinc-nickel wastewater generally refers to the rinsing wastewater generated in the zinc-nickel electroplating process. Sometimes the pre-treatment wastewater, pickling wastewater and rinsing wastewater in the zinc-nickel electroplating process are collectively referred to as zinc-nickel wastewater, which is one of the common electroplating wastewaters. Due to the presence of a large amount of triethanolamine, polyethylene polyamine and other complexing agents in zinc-nickel wastewater, it is difficult to remove heavy metal nickel in the wastewater using the traditional alkali precipitation method. Therefore, it is a kind of electroplating wastewater that is difficult to treat.

[0003] Although there are mature treatment methods for zinc-nickel wastewater, these systems still have some problems during operation: (1) The use of traditional oxidation methods, such as sodium hypochlorite, Fenton, etc., has the advantage of having a certain removal effect on the complex in zinc-nickel wastewater, is easy to operate, and can be directly added with reagents, but its treatment effect is not thorough, the amount of reagents added is large, the treatment cost is high, and it is not environmentally friendly; (2) The use of advanced oxidation methods such as electrocatalysis and ozone, the advantage of this method is that the amount of reagents added is small, the treatment effect is good, and the treatment cost is reduced, but the investment cost is high and the equipment requirements are high; (3) The use of chelating agents, the advantage of this method is that the operation is simple and direct, and the zinc-nickel removal effect is good, but there is no removal effect on the complex, the amount of reagents added is large, the treatment cost is high, and it has a great impact on the subsequent process. Regardless of the treatment process adopted, the corresponding chemical reagents need to be added for treatment. At present, the common dosing reaction mostly uses traditional civil engineering reaction tanks, and the fluidized method uses mechanical stirring, which often has problems such as uneven dosing stirring, low reagent utilization, inconvenient maintenance, and environmental unfriendliness. Moreover, the current common zinc-nickel wastewater treatment processes focus on the removal of heavy metal nickel, ignoring the difficult-to-remove organic nitrogen in the wastewater, increasing the pressure to meet the standards for subsequent biochemical denitrification, and even causing nickel anti-complexation problems when mixed with other wastewaters, making it difficult for nickel to meet the standards. This paper aims to invent a zinc-nickel wastewater treatment device. The system combines the water quality characteristics of zinc-nickel wastewater, which can not only improve the effluent effect of zinc-nickel wastewater, reduce treatment costs, save land, and reduce environmental impact. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a zinc-nickel alloy wastewater treatment device, which adopts the following technical solutions:

[0005] A zinc-nickel alloy wastewater treatment device is characterized in that it comprises an acid adjustment reaction tank, a denitrification and complex breaking reactor, an oxidation reaction tank, a pH adjustment tank and a sedimentation tank which are sequentially connected along the wastewater treatment process direction; a water inlet pipe is provided on one side of the acid adjustment reaction tank; a water outlet pipe is provided on the upper part of the sedimentation tank; a mud hopper is provided at the bottom of the sedimentation tank, and a mud discharge hole is provided in the center of the mud hopper; an acid adjustment tank lifting pump is provided between the acid adjustment reaction tank and the denitrification and complex breaking reactor.

[0006] Furthermore, an acid addition circulation pump is provided outside the acid adjustment reaction tank; a denitrification and complex breaking circulation pump is provided outside the denitrification and complex breaking reactor; and an oxidation circulation pump is provided outside the oxidation reaction tank.

[0007] Furthermore, the denitrification and decomplexation reactor is provided with a partition, which divides the reactor into several compartments, and a vent is provided at the bottom of each compartment; a baffle is provided in the compartment, which is vertically installed in the reactor, with the end at an angle of 145° and 50cm to 80cm away from the bottom of the reactor; an inclined plate is provided in the compartment, which is installed at the bottom of the reactor at an angle of 45°.

[0008] Furthermore, an acid addition port is provided above the acid adjustment reaction tank, a drug addition port a is provided above the denitrification and decomplexation reactor, a drug addition port b is provided above the oxidation reaction tank, and a drug addition port c and a drug addition port d are provided above the pH adjustment tank.

[0009] Furthermore, a first pH meter is provided in the acid adjustment reaction tank, a second pH meter is provided in the pH adjustment tank, and a stirrer is provided in the pH adjustment tank.

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

[0011] (1) The device improves the reagent reaction efficiency, reduces reagent loss, and at the same time improves the zinc-nickel wastewater treatment effect;

[0012] (2) The device uses hydraulic fluidization, which effectively avoids the problem of equipment corrosion, reduces the equipment failure rate, and reduces the difficulty of subsequent maintenance;

[0013] (3) The device occupies a small area, and the device is made of corrosion-resistant plastic materials such as PP, etc., with low investment cost;

[0014] (4) The device has a simple structure, is easy to manufacture, and can meet different water treatment requirements;

[0015] (5) The device is equipped with a sealing cover, so that the harmful gases generated during the reaction can be effectively collected and treated to avoid their negative impact on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the device of the utility model; Figure 2 This is a process flow chart of the utility model.

[0017] Wherein 1 is an acid adjustment reaction tank, 101 is a water inlet, 102 is an acid addition port, 103 is an acid addition circulation pump, 104 is a water outlet, 105 is a circulation inlet, 106 is a circulation outlet, 107 is a first pH meter, and 108 is an acid adjustment tank lifting pump;

[0018] 2- denitrification and decomposition reactor, 201- water inlet, 202- circulating water outlet, 203- dosing port a, 204- water outlet, 205- circulating water inlet, 206- left inclined plate, 207- right inclined plate, 208- baffle, 209- partition, 210- vent, 211- denitrification and decomposition circulation pump;

[0019] 3-oxidation reaction tank, 301-water inlet, 302-dosing port b, 303-oxidation circulation pump, 304-circulation inlet, 305-circulation outlet, 306-flow pipe;

[0020] 4-pH regulating tank, 401-dosing port c, 402-dosing port d, 403-mixer, 404-second pH meter, 405-flow pipe;

[0021] 5-sedimentation tank, 501-mud bucket, 502-mud discharge hole, 503-outlet weir plate, 504-outlet pipe. DETAILED DESCRIPTION

[0022] The utility model is further elaborated and illustrated below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1 As shown, the utility model provides a zinc-nickel alloy wastewater treatment device, the system includes: an acid adjustment reaction tank 1, a water inlet 101, an acid addition port 102, an acid addition circulation pump 103, a water outlet 104, a circulation inlet 105, a circulation outlet 106, a first pH meter 107, and an acid adjustment tank lift pump 108; a denitrification and complex breaking reactor 2, a water inlet 201, a circulation outlet 202, a dosing port a203, a water outlet 204, a circulation inlet 205, a left inclined plate 206, a right inclined plate 207, a baffle 208, a partition 209, a vent 210, and a denitrification and complex breaking circulation pump 211; an oxidation reaction tank 3, a water inlet 301, a dosing port b 302, an oxidation circulation pump 303, a circulation inlet 304, a circulation outlet 305, and a flow pipe 306; a pH adjustment tank 4, a dosing port c 401, a dosing port d 402, agitator 403, a second pH meter 404, a flow pipe 405; sedimentation tank 5, a mud bucket 501, a mud discharge hole 502, a water outlet weir plate 503, and a water outlet pipe 504.

[0024] The device comprises an acid adjustment reaction tank, a denitrification and complex breaking reactor, an oxidation reaction tank, a pH adjustment tank and a sedimentation tank which are sequentially connected along the direction of the wastewater treatment process; a water inlet pipe is arranged on one side of the acid adjustment reaction tank; a water outlet pipe is arranged on the upper part of the sedimentation tank; a mud bucket is arranged at the bottom of the sedimentation tank, and a mud discharge hole is arranged at the center of the mud bucket; an acid adjustment tank lifting pump is arranged between the acid adjustment reaction tank and the denitrification and complex breaking reactor.

[0025] An acid-adding circulation pump is provided outside the acid-adjusting reaction tank; a denitrification and decomplexing circulation pump is provided outside the denitrification and decomplexing reactor; and an oxidation circulation pump is provided outside the oxidation reaction tank. A partition is provided inside the denitrification and decomplexing reactor to divide the reactor into several compartments, and a vent is provided below each compartment; a baffle is provided inside the compartment, which is vertically installed inside the reactor, with the end at an angle of 145°, 50cm to 80cm from the bottom of the reactor; an inclined plate is provided inside the compartment, which is installed at the bottom of the reactor at an angle of 45°. An acid-adding port is provided above the acid-adjusting reaction tank, a drug-adding port a is provided above the denitrification and decomplexing reactor, a drug-adding port b is provided above the oxidation reaction tank, and drug-adding ports c and d are provided above the pH-adjusting tank. Furthermore, a first pH meter is provided inside the acid-adjusting reaction tank, a second pH meter is provided inside the pH-adjusting tank, and a stirrer is provided inside the pH-adjusting tank.

[0026] The treatment process of the system is as follows: zinc-nickel wastewater enters the acid adjustment reaction tank 1 from the water inlet pipe 101, and an appropriate amount of hydrochloric acid with a concentration of 5% to 28% is added to the wastewater through the acid addition port 102 to adjust the pH of the wastewater to 3.0 to 4.0. After hydraulic circulation and fluidization, the circulation ratio is controlled to be 200% to 300%, and the hydraulic retention time is 30min to 45min; the wastewater passes through the acid adjustment tank lift pump 108 and enters the denitrification and decomplexation reactor 2. Then, 3 g / L to 4 g / L of denitrification complex breaking agent is added to the denitrification complex breaking reactor 2 through the dosing port a 203. The wastewater mixed with the denitrification complex breaking agent first performs an up-and-down baffle movement in the first compartment, then moves downward along the baffle plate 208, and changes to a horizontal movement under the guidance of the left inclined plate 206, effectively avoiding the problem of hydraulic short-circuiting. Subsequently, it starts to move upward under the guidance of the right inclined plate 207 and the partition plate 209, overflows from the partition plate 209 into the second compartment, and starts a new up-and-down baffle movement. Figure 1As shown by the arrow in the middle; a large number of bubbles will be generated during the mixing process of the denitrification and decomplexing agent and the wastewater, and the bubbles will stir the wastewater as the wastewater flows upward, similar to the aeration effect. Under the dual effects of up and down folding movement and aeration stirring, the wastewater is fully in contact with the denitrification and decomplexing agent, which is beneficial to improve the reaction efficiency of the agent and reduce the loss of the agent; at the same time, under the action of the denitrification and decomplexing circulation pump 211, the wastewater is hydraulically circulated in the denitrification and decomplexing reactor 2, and the circulation ratio is controlled to be 250% to 350%, the hydraulic retention time is 3h, and the flow rate is about 6mm / s; the fifth compartment, the sixth compartment, etc. can be added according to the actual amount of water to be treated. The effluent of the denitrification and decomplexation reactor flows by gravity into the oxidation reaction tank 3, and hydrogen peroxide with a concentration of 8% to 10% is added to the wastewater through the dosing port b 302. The hydrogen peroxide and the wastewater are fully mixed through the oxidation circulation pump 303, and the hydraulic circulation ratio is controlled to be 200% to 300%, and the hydraulic retention time is 30 minutes. Then the wastewater enters the pH adjustment tank 4 through the flow pipe 306. Lime is added through the top dosing port c to adjust the pH of the wastewater to about 11.0. Under the action of the stirrer 403, the lime and the wastewater are fully mixed, and the heavy metal nickel in the wastewater forms nickel hydroxide precipitation; an appropriate amount of polyacrylamide aqueous solution with a concentration of 0.1% to 1% is added through the dosing port d402 to form larger flocs of heavy metals in the wastewater for easy sedimentation and separation. The residence time of pH adjustment tank 4 is controlled to be 45 minutes, and then the wastewater enters the sedimentation tank through flow pipe 405 for solid-liquid separation, the supernatant is discharged from the outlet pipe 504, and the precipitate in the wastewater gradually settles on the mud bucket 501 and is regularly discharged from the mud discharge hole 502 into the sludge tank.

[0027] At present, most zinc-nickel wastewater treatment devices have problems such as uneven mixing of dosing, low utilization rate of reagents, inconvenient maintenance and environmental unfriendliness. The utility model combines the water quality characteristics of zinc-nickel wastewater to invent a zinc-nickel wastewater treatment device, which can improve the effluent effect of zinc-nickel wastewater, reduce treatment costs, save space and reduce environmental impact.

[0028] Example

[0029] 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.

[0030] A zinc-nickel wastewater treatment device was trial-produced using the above technical solution. Figure 1 and Figure 2 As shown, the treatment object is zinc-nickel wastewater.

[0031] This device was used to treat zinc-nickel wastewater from a certain electroplating park. The raw water quality was: pH 3-5, nickel 60 mg / L, organic nitrogen 300 mg / L. The effluent quality is shown in Table 1.

[0032] Table 1 Water quality of the effluent from the treatment device of the utility model

[0033]

[0034] As shown in Table 1, the treatment device of the utility model is used to treat zinc-nickel wastewater, and the organic nitrogen in the raw water is reduced from 300 mg / L to below 30 mg / L, and the nickel is reduced from 60 mg / L to below 5 mg / L. The treatment effect is obvious, and the removal effect of organic nitrogen is good. It shows that the treatment device of the utility model can effectively improve the reaction efficiency of the reagent and significantly reduce the heavy metal nickel and organic nitrogen in zinc-nickel wastewater.

[0035] 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 zinc-nickel wastewater treatment device, characterized in that: It comprises an acid adjustment reaction tank, a denitrification and complex breaking reactor, an oxidation reaction tank, a pH adjustment tank and a sedimentation tank which are sequentially connected along the wastewater treatment process direction; a water inlet pipe is arranged on one side of the acid adjustment reaction tank; a water outlet pipe is arranged on the upper part of the sedimentation tank; a mud hopper is arranged at the bottom of the sedimentation tank, and a mud discharge hole is arranged at the center of the mud hopper; an acid adjustment tank lifting pump is arranged between the acid adjustment reaction tank and the denitrification and complex breaking reactor.

2. A zinc-nickel wastewater treatment device according to claim 1, characterized in that: An acid adding circulation pump is arranged outside the acid adjustment reaction tank; a denitrification and complex breaking circulation pump is arranged outside the denitrification and complex breaking reactor; and an oxidation circulation pump is arranged outside the oxidation reaction tank.

3. A zinc-nickel wastewater treatment device according to claim 1, characterized in that: The denitrification and decomplexation reactor is provided with a partition to divide the reactor into several compartments, and a vent is provided at the bottom of each compartment; a baffle is provided in the compartment, which is vertically installed in the reactor, with the end at an angle of 145° and 50 cm to 80 cm away from the bottom of the reactor; an inclined plate is provided in the compartment, which is installed at the bottom of the reactor at an angle of 45°.

4. A zinc-nickel wastewater treatment device according to claim 1, characterized in that: An acid adding port is arranged above the acid adjustment reaction tank, a drug adding port a is arranged above the denitrification and decomplexation reactor, a drug adding port b is arranged above the oxidation reaction tank, and a drug adding port c and a drug adding port d are arranged above the pH adjustment tank.

5. A zinc-nickel wastewater treatment device according to claim 1, characterized in that: A first pH meter is arranged in the acid adjustment reaction tank, a second pH meter is arranged in the pH adjustment tank, and a stirrer is arranged in the pH adjustment tank.

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