CN212982715U - Treatment equipment for zinc-nickel alloy electroplating wastewater - Google Patents
Treatment equipment for zinc-nickel alloy electroplating wastewater Download PDFInfo
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Abstract
The utility model discloses a zinc-nickel alloy electroplating effluent's treatment facility, include the regulating reservoir that catchments, first pH regulating reservoir, ultraviolet catalytic oxidation reaction pond, second pH regulating reservoir, the reaction tank that thoughtlessly congeals, mix pond, sedimentation tank and the mud pressure filter that connect gradually from the front to the back. The utility model discloses electroplating effluent treatment process optimizes traditional zinc-nickel alloy, newly-increased ultraviolet catalysis wet oxidation technique, degrades and gets rid of the complexing agent in the zinc-nickel alloy electroplating effluent for aquatic zinc and nickel are got rid of with the form release of ion state, and the rethread adds the mode that alkali and heavy metal trapping agent deposit, guarantees that the tail water discharges stably up to standard.
Description
Technical Field
The utility model relates to the technical field of environmental engineering, in particular to a zinc-nickel alloy electroplating wastewater treatment device and a process.
Background
Alloy electroplating is a surface treatment technology which is rapidly developed in recent years, contains two or more than two metal coating layers, and has the characteristics of high hardness, high density, wear resistance, corrosion resistance, strong high temperature resistance, easy welding and attractive appearance compared with a single metal coating layer. The Zn-Ni alloy is widely applied in nearly 10 years, the corrosion resistance of the alloy coating is 7-10 times higher than that of a zinc coating, the appearance can be kept unchanged for 10 years, the hydrogen brittleness sensitivity is low, and the Zn-Ni alloy particularly shows excellent corrosion resistance in severe atmosphere and marine environment. The zinc and nickel have very different precipitation potentials due to their very different properties. In order to satisfy the stability and codeposition of zinc and nickel in the coating, a complexing agent and a coordination agent for adjusting the precipitation potential of two metal ions are generally required to be added, so that the equilibrium potential of the metal with the potential larger than that of the positive metal is shifted negatively, the equilibrium potential of the two metals with the potential difference is approximate, and the two metals are better codeposited.
The zinc-nickel alloy electroplating wastewater usually comes from the rinsing process and residual bath solution of plated parts, and according to detection, the alkaline zinc-nickel alloy plating solution mainly contains zinc ions, nickel ions, sodium hydroxide, triethanolamine, a nickel complexing agent and the like. Because the complexing agent is added, the metal ions exist in a complex form, and the requirement of the treatment standard is generally difficult to meet when the conventional alkali-adding precipitation mode is adopted to treat the wastewater. The prior treatment process of the zinc-nickel alloy electroplating wastewater generally adopts the steps of diluting with other water in large amount and then mixing and discharging, or adopts a heavy metal catching agent alone to treat and then mixing the treated water into comprehensive water for unified treatment.
Because nickel is a pollutant, the discharge standard of the discharge port in a workshop needs to be met, the problem cannot be solved fundamentally by adopting a large water volume dilution treatment mode, the subsequent treatment difficulty is increased, and the waste phenomenon also exists in the aspect of water resource utilization; the wastewater treated by the heavy metal catching agent can temporarily meet the discharge requirement, but the heavy metal complexing agent in the water is not removed, and when the wastewater enters the comprehensive water for unified treatment, the heavy metal complexing agent can be combined with the heavy metal in the comprehensive water again, so that the treatment difficulty of the comprehensive water is increased, and the treatment stability is reduced.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art, the utility model aims to provide a zinc-nickel alloy electroplating effluent's treatment facility can effectively get rid of the heavy metal complexing agent in the zinc-nickel alloy electroplating effluent, improves the stability of follow-up comprehensive waste water treatment system operation, guarantees that the tail water discharges stably up to standard.
The purpose of the utility model is realized by adopting the following technical scheme:
a treatment device for zinc-nickel alloy electroplating wastewater comprises a water collecting adjusting tank, a first pH adjusting tank, an ultraviolet catalytic oxidation reaction tank, a second pH adjusting tank, a coagulation reaction tank, a mixing tank, a sedimentation tank and a sludge filter press which are sequentially connected from front to back; a first pH regulator is added into the first pH regulating tank and used for regulating the pH value of the wastewater to 4, and the ultraviolet catalytic oxidation effect is optimal under the condition that the pH value is 4; an oxidant and a catalyst are added into the ultraviolet catalytic oxidation reaction tank, and an ultraviolet generator is arranged on the ultraviolet catalytic oxidation reaction tank; a second pH regulator is added into the second pH regulating pool and is used for regulating the pH of the wastewater to be in alkalescence of 7.0-7.5; a heavy metal catching agent is added into the coagulation reaction tank; a flocculating agent is added into the mixing tank.
The complexing agent in the zinc-nickel alloy electroplating wastewater is complex in component, the complexing agent is oxidized to a degradable intermediate state in the UV-CWOP oxidation process, the COD (chemical oxygen demand) can be oxidized to be less than or equal to 200mg/L in the oxidation process through intermediate product analysis, the purpose of complex breaking is achieved, heavy metal exists in the wastewater in an ionic state, the wastewater is adjusted to be alkalescent through adjusting the pH value and is added with a heavy metal trapping agent for precipitation, the wastewater enters a mixing tank to be added with a flocculating agent to generate large water-insoluble floc, and finally the large water-insoluble floc passes through a precipitation tank. And (4) discharging effluent meeting the discharge standard after passing through a sedimentation tank, and pressing sludge into dry sludge by a sludge filter press, and then handing the dry sludge by a qualification unit.
Further, the first pH adjusting agent is sulfuric acid; sodium hydroxide is added in the second pH adjustment.
Still further, the oxidant comprises one or more of hydrogen peroxide, air, oxygen and peroxyacetic acid; the catalyst is an iron catalyst, in particular ferrous sulfate heptahydrate, so as to improve the oxidation efficiency.
Further, the heavy metal trapping agent is HMC-M2. The principle of the heavy metal trapping agent is that the heavy metal trapping agent and metal ions generate chelation precipitation reaction to generate water-insoluble chelation precipitation, thereby achieving the effect of removing the metal ions.
And the buffer tank is arranged between the second pH adjusting tank and the coagulation reaction tank and is used for controlling the water yield of the wastewater discharged to the coagulation reaction tank. The water yield is controlled to be regulated and controlled mainly according to the daily treatment capacity, and the water yield is regulated to achieve the homogenization effect.
Further, the mixing tank comprises a first mixing tank and a second mixing tank, and the flocculating agent comprises a first flocculating agent and a second flocculating agent; a first flocculating agent is added into the first mixing tank, and the first flocculating agent is PAC; and a second flocculating agent is added into the second mixing tank, and the second flocculating agent is PAM. PAC is polyaluminium chloride, has high electric neutralization and bridging effects on colloids and particles in water, can strongly remove micro-toxic substances and heavy metal ions, and has stable properties. PAM is polyacrylamide, and polyacrylamide is a water-soluble linear high molecular polymer formed by free radical initiated polymerization of Acrylamide (AM) monomers, has good flocculation property, and can reduce the frictional resistance between liquids. The first mixing tank is used for forming flocs, and the second mixing tank is used for polymerizing the flocs formed by the first mixing tank into large-particle flocs so as to facilitate the sedimentation of the flocs in the subsequent step.
The process of the zinc-nickel alloy electroplating wastewater treatment equipment comprises the following steps:
1) the zinc-nickel alloy wastewater enters a water collecting adjusting tank through a pipeline to carry out water quality homogenization adjustment;
2) after the water is discharged from the water collection regulating tank, the zinc-nickel alloy wastewater enters a first pH regulating tank, a first pH regulator is added to regulate the pH of the zinc-nickel alloy wastewater to 4, and then the zinc-nickel alloy wastewater is conveyed to an ultraviolet catalytic oxidation reaction tank;
3) after zinc-nickel alloy wastewater enters an ultraviolet catalytic oxidation reaction tank, radiating ultraviolet rays, adding an oxidant and a catalyst, and discharging the zinc-nickel alloy wastewater to a second pH regulating tank after the zinc-nickel alloy wastewater reacts until COD is less than or equal to 200 mg/L;
4) after the zinc-nickel alloy wastewater enters a second pH adjusting tank, adding a second pH adjusting agent, adjusting the pH of the zinc-nickel alloy wastewater to 7.0-7.5, and conveying the zinc-nickel alloy wastewater to a buffer tank;
5) controlling the water yield of the zinc-nickel alloy wastewater by the buffer tank, discharging the zinc-nickel alloy wastewater to a coagulation reaction tank, and adding a heavy metal capture agent;
6) discharging the zinc-nickel alloy wastewater in a coagulation reaction tank, then feeding the zinc-nickel alloy wastewater into a first mixing tank, adding PAC (polyaluminium chloride), stirring, standing for 900s, then discharging the liquid into a second mixing tank, adding PAM (polyacrylamide), and standing for 900 s; wherein the stirring speed is 500r/min
7) And (3) taking the upper layer liquid of the second mixing tank to be discharged to a sedimentation tank, taking the upper layer clear liquid of the sedimentation tank to be discharged to the outside, such as a clear water tank, and conveying the lower layer sludge of the sedimentation tank to a sludge filter press.
Further, in the step 1), the rotation speed of homogenizing is 62 r/min.
Still further, in step 3), the ultraviolet generator synchronously radiates ultraviolet rays having UV values of 254nm and 185 nm.
Further, in step 5), the reaction time was 1 hour.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses electroplating effluent treatment facility optimizes traditional zinc-nickel alloy, newly-increased ultraviolet catalysis wet oxidation equipment, degrades and gets rid of the complexing agent in the zinc-nickel alloy electroplating effluent for aquatic zinc and nickel are got rid of with the form release of ion state, and the rethread adds the mode that alkali and heavy metal trapping agent deposit, guarantees that the tail water discharges stably up to standard.
Drawings
FIG. 1 is a diagram of the process route of the present invention;
FIG. 2 is a diagram of the reaction steps of the ultraviolet generator.
In the figure: 1. a gas source; 2. a water source; 3. a water collecting and adjusting tank; 4. a first pH adjusting tank; 41. a sulfuric acid bucket; 5. an ultraviolet catalytic oxidation reaction tank; 51. a catalyst barrel; 52. an oxidant barrel; 6. a second pH adjusting tank; 61. a liquid caustic soda barrel; 7. a buffer pool; 8. a coagulation reaction tank; 81. a heavy metal scavenger bucket; 9. a first mixing tank; 91. a PAC bucket; 10. a second mixing tank; 101. a PAM bucket; 11. a sedimentation tank; 12. a sludge filter press; 13. a clean water tank.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
As shown in fig. 1, a treatment device for zinc-nickel alloy electroplating wastewater comprises a water collection regulating reservoir 3, a first pH regulating reservoir 4, an ultraviolet catalytic oxidation reaction reservoir 5, a second pH regulating reservoir 6, a coagulation reaction reservoir 8, a mixing reservoir, a sedimentation reservoir 11 and a sludge filter press 12 which are connected in sequence from front to back; a first pH regulator is added into the first pH regulating tank 4 and is used for regulating the pH value of the wastewater to 4; an oxidant and a catalyst are added into the ultraviolet catalytic oxidation reaction tank 5, and an ultraviolet generator is arranged on the ultraviolet catalytic oxidation reaction tank 5; a second pH regulator is added into the second pH regulating tank 6 and is used for regulating the pH of the wastewater to be alkalescent; a heavy metal catching agent is added into the coagulation reaction tank 8; a flocculating agent is added into the mixing tank.
Further, the first pH regulator is sulfuric acid for regulating the pH value of the wastewater to 4, the sulfuric acid is placed in a sulfuric acid bucket 41, and the sulfuric acid is transported from the sulfuric acid bucket 41 to the first pH regulating tank 4 by using a lift pump; the second pH adjusting agent comprises sodium hydroxide, the alkali solution is placed in the liquid alkali bucket 61, and the alkali solution is transported from the liquid alkali bucket 61 to the second pH adjusting tank 6 by using a lift pump.
Still further, the oxidant comprises one or more of hydrogen peroxide, air, oxygen and peroxyacetic acid; the catalyst is ferrous sulfate heptahydrate. The oxidant and the catalyst are respectively placed in the oxidant barrel 52 and the catalyst barrel 51, and are respectively conveyed to the ultraviolet catalytic oxidation reaction tank 5 by utilizing a lift pump.
Further, the heavy metal trapping agent is HMC-M2. The heavy metal capturing agent is placed in the heavy metal capturing agent bucket 81, and is transported to the coagulation reaction tank 8 by using a lift pump.
Still further, the device also comprises a buffer tank 7, wherein the buffer tank 7 is arranged between the second pH adjusting tank 6 and the coagulation reaction tank 8, and the buffer tank 7 is used for controlling the water outlet amount of the wastewater discharged to the coagulation reaction tank 8 to be 1m3/h。
Further, the mixing tank comprises a first mixing tank 9 and a second mixing tank 10, and the flocculating agent comprises a first flocculating agent and a second flocculating agent; a first flocculating agent is added into the first mixing tank 9, the first flocculating agent is PAC, and the first flocculating agent is placed in a PAC barrel 91; the second mixing tank 10 is added with a second flocculant, which is PAM, and placed in a PAM tank 101.
In particular, the supernatant finally treated by the settling tank 11 may be discharged to a clean water tank 13, stored in the clean water tank 13 and subjected to a water quality inspection.
Specifically, a water source 2 and an air source 1 are required to be introduced into the equipment, and as can be seen from fig. 1, air in the air source 1 circulates in a liquid caustic soda barrel 61, a first pH adjusting tank 4, an ultraviolet catalytic oxidation reaction tank 5, a second pH adjusting tank 6, a coagulation reaction tank 8, a first mixing tank 9 and a second mixing tank 10, so that the reaction in the equipment is ensured to be carried out in an aeration process, the water quality is mainly uniformly mixed, suspension in the tank is prevented from sinking, and the purpose of contact of organic matters in the tank with microorganisms and dissolved oxygen is enhanced. Thereby ensuring the function of the microorganisms in the tank on the oxidative decomposition of organic matters in the sewage under the condition of sufficient dissolved oxygen.
Tap water and corresponding reagents in a water source need to be added into the sulfuric acid barrel 41, the catalyst barrel 51, the oxidant barrel 52, the liquid caustic soda barrel 61, the heavy metal capture agent barrel 81, the PAC barrel 91 and the PAM barrel 101 to supplement liquid in the barrels in time.
Because a complexing agent is added during the zinc-nickel alloy electroplating to enable metal ions to exist in a complex form, the ultraviolet catalytic wet oxidation technology (UV-CWOOP) is utilized to break the complex, so that zinc and nickel exist in an ion form, and the specific mechanism of the UV-CWOOP is as follows:
the ultraviolet generator can radiate high-strength ultraviolet rays, and high-energy photons can directly photodegrade organic matters in the wastewater to break bonds and mineralize the organic matters; meanwhile, the high-energy photons can also sensitize refractory organic matters to enable the refractory organic matters to be in an unstable sensitizing state, and further degradation is facilitated. Then adding oxidant and catalyst to make catalytic oxidation of organic matter. The ultraviolet catalytic oxidation reaction tank 5 simultaneously introduces ultraviolet light, a catalyst and an oxidant, utilizes the synergistic effect of the ultraviolet light, the catalyst and the oxidant to generate free radicals such as O, OH and the like, realizes advanced oxidation, and thoroughly decomposes organic pollutants in the wastewater into CO2And water, and the like, and simultaneously has the functions of deodorization, decoloration, sterilization and disinfection. The specific reaction steps are shown in FIG. 2.
Example 1
Taking zinc-nickel alloy electroplating wastewater of a large electroplating plant in Jiangsu as a test object, and the water quality of raw water is as shown in the following table.
TABLE 1 Water quality data before treatment of Zn-Ni alloy electroplating wastewater
Use the utility model provides a zinc-nickel alloy electroplating effluent's treatment facility handles waste water, zinc-nickel alloy electroplating effluent's treatment facility's technology, a serial communication port, including following step:
1) the zinc-nickel alloy wastewater enters a water collecting adjusting tank 3 through a pipeline for water quality homogenization adjustment; wherein the rotation speed of homogenization is 62 r/min;
2) after the zinc-nickel alloy wastewater is discharged from the water collection regulating tank 3, the zinc-nickel alloy wastewater enters a first pH regulating tank 4, 2mol/L sulfuric acid is added under the action of aeration to regulate the pH of the zinc-nickel alloy wastewater to 4, and then the zinc-nickel alloy wastewater is conveyed to an ultraviolet catalytic oxidation reaction tank 5;
3) after zinc-nickel alloy wastewater enters an ultraviolet catalytic oxidation reaction tank 5, radiating ultraviolet rays, adding 1mol/L hydrogen peroxide and ferrous sulfate heptahydrate, and discharging the zinc-nickel alloy wastewater to a second pH adjusting tank 6 after the zinc-nickel alloy wastewater reacts until COD is below 200 mg/L; wherein the ultraviolet generator synchronously radiates ultraviolet rays with UV values of 254nm and 185 nm.
4) After the zinc-nickel alloy wastewater enters a second pH adjusting tank 6, adding 1mol/L sodium hydroxide, adjusting the pH of the zinc-nickel alloy wastewater to 7.0, and conveying the zinc-nickel alloy wastewater to a buffer tank 7;
5) the buffer tank 7 controls the water yield of the zinc-nickel alloy wastewater to be 1m3Discharging to a coagulation reaction tank 8 after the reaction lasts for 0.5 hour, and adding an HMC-M2 heavy metal capture agent;
6) discharging the zinc-nickel alloy wastewater in a coagulation reaction tank 8, feeding the zinc-nickel alloy wastewater into a first mixing tank 9, adding 0.5 mol/LPAC, stirring, standing for 900s, discharging the liquid into a second mixing tank 10, adding 0.02 mol/LPAM, and standing for 900 s; wherein the stirring speed is 84r/min
7) And (3) taking the upper layer liquid of the second mixing tank 10 and discharging to a sedimentation tank 11, taking the upper layer clear liquid of the sedimentation tank 11 and discharging to a clear water tank 13, and conveying the lower layer sludge of the sedimentation tank 11 to a sludge filter press 12.
The water quality of the treated water in the clean water tank 13 is checked, and the data is as follows:
TABLE 2 data of water quality after treatment of zinc-nickel alloy electroplating wastewater
According to the data in tables 1 and 2, after the zinc-nickel alloy electroplating wastewater is treated, the organic matter pollution condition, the total nickel content, the suspended matter content and the chroma are all reduced, according to the emission standard of water pollutants for the iron and steel industry (GB13456-2012), the maximum allowable emission concentration of the total nickel content is 1.0mg/L, the pH primary standard range is 6-9, the maximum allowable emission concentration of the chroma (dilution multiple) is 50mg/L (primary standard) and 80mg/L (secondary standard), the maximum allowable emission concentration of the suspended matter (SS) is 70mg/L (primary standard) and 200mg/L (secondary standard), and the maximum allowable emission concentration of the CODcr is 100mg/L (primary standard) and 150mg/L (secondary standard). Waste water after handling promptly accords with emission standard, the utility model provides a zinc-nickel alloy electroplating effluent's equipment and technology can effectively get rid of the heavy metal complexing agent in the zinc-nickel alloy electroplating effluent, improves the stability of follow-up comprehensive waste water treatment system operation, guarantees that the tail water discharges stably up to standard.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (6)
1. A zinc-nickel alloy electroplating wastewater treatment device is characterized by comprising a water collection regulating tank, a first pH regulating tank, an ultraviolet catalytic oxidation reaction tank, a second pH regulating tank, a coagulation reaction tank, a mixing tank, a sedimentation tank and a sludge filter press which are sequentially connected from front to back; a first pH regulator is added into the first pH regulating pool and is used for regulating the pH value of the wastewater to 4; an oxidant and a catalyst are added into the ultraviolet catalytic oxidation reaction tank, and an ultraviolet generator is arranged on the ultraviolet catalytic oxidation reaction tank; a second pH regulator is added into the second pH regulating pool and is used for regulating the pH of the wastewater to 7.0-7.5; a heavy metal catching agent is added into the coagulation reaction tank; a flocculating agent is added into the mixing tank.
2. The apparatus for treating zinc-nickel alloy electroplating wastewater according to claim 1, wherein the first pH adjuster is sulfuric acid; the second pH regulator is sodium hydroxide.
3. The apparatus for treating zinc-nickel alloy electroplating wastewater according to claim 1, wherein the oxidizing agent is one of hydrogen peroxide, air, oxygen, and peracetic acid; the catalyst is an iron catalyst.
4. The apparatus for treating wastewater from zinc-nickel alloy electroplating according to claim 1, wherein said heavy metal scavenger is HMC-M2.
5. The apparatus for treating zinc-nickel alloy electroplating wastewater according to claim 1, further comprising a buffer tank disposed between the second pH adjusting tank and the coagulation reaction tank.
6. The apparatus for treating zinc-nickel alloy electroplating wastewater according to claim 1, wherein the mixing tank comprises a first mixing tank and a second mixing tank, and the flocculating agent comprises a first flocculating agent and a second flocculating agent; a first flocculating agent is added into the first mixing tank, and the first flocculating agent is PAC; and a second flocculating agent is added into the second mixing tank, and the second flocculating agent is PAM.
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