CN112225302A - Ammonia nitrogen wastewater treatment method and system - Google Patents
Ammonia nitrogen wastewater treatment method and system Download PDFInfo
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- CN112225302A CN112225302A CN202010901137.XA CN202010901137A CN112225302A CN 112225302 A CN112225302 A CN 112225302A CN 202010901137 A CN202010901137 A CN 202010901137A CN 112225302 A CN112225302 A CN 112225302A
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- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 416
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 87
- 239000002351 wastewater Substances 0.000 claims abstract description 257
- 238000005530 etching Methods 0.000 claims abstract description 227
- 238000010521 absorption reaction Methods 0.000 claims abstract description 84
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000000460 chlorine Substances 0.000 claims abstract description 51
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 51
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910001431 copper ion Inorganic materials 0.000 claims abstract description 43
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910052802 copper Inorganic materials 0.000 claims abstract description 40
- 239000010949 copper Substances 0.000 claims abstract description 40
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 33
- 238000000605 extraction Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 238000001179 sorption measurement Methods 0.000 claims description 27
- 239000000498 cooling water Substances 0.000 claims description 23
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 30
- 239000012535 impurity Substances 0.000 description 15
- 238000011084 recovery Methods 0.000 description 12
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 5
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 4
- 241000196171 Hydrodictyon reticulatum Species 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 hypochlorite ions Chemical class 0.000 description 2
- 229910017464 nitrogen compound Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/46—Regeneration of etching compositions
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/24—Halogens or compounds thereof
- C25B1/26—Chlorine; Compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/12—Electrolytic production, recovery or refining of metals by electrolysis of solutions of copper
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The application provides an ammonia nitrogen wastewater treatment method and system. The ammonia nitrogen wastewater treatment method comprises the steps of circulating an etching solution in an etching solution tank and an electrolytic bath; carrying out electrolysis operation on the etching solution in the electrolytic bath; performing air extraction operation in the electrolytic cell to obtain chlorine; detecting the copper content of the etching solution in the etching solution tank, stopping electrolysis operation if the concentration of copper ions is 120-130 g/l, and adjusting preset components of the etching solution to obtain PCB etching solution; if the concentration of the copper ions is more than 130g/l, continuing the electrolysis operation; circulating the ammonia nitrogen wastewater in an ammonia nitrogen wastewater collecting tank and an absorption tank; and introducing chlorine into the ammonia nitrogen wastewater in the absorption tank to carry out ammonia nitrogen removal operation. The ammonia nitrogen wastewater treatment method reduces the ammonia nitrogen wastewater treatment cost and improves the ammonia nitrogen wastewater treatment effect, and the ammonia nitrogen wastewater treatment can be completed only by using equipment with smaller volume.
Description
Technical Field
The invention relates to the technical field of ammonia nitrogen wastewater treatment, in particular to a method and a system for treating ammonia nitrogen wastewater.
Background
The ammonia nitrogen wastewater generated after the alkaline etching is carried out on the PCB by the existing PCB preparation factory and the ammonia nitrogen wastewater generated by other procedures of adjusting the pH value by using ammonia water are complex to treat and have higher treatment cost. Along with the stricter standard of the ammonia nitrogen discharge of the wastewater, the treatment cost and the treatment difficulty of the ammonia nitrogen wastewater are gradually increased, and the treatment measures of the ammonia nitrogen wastewater are commonly used, such as a blow-off method, a breakpoint chlorination, a nitrification and denitrification and other treatment modes, wherein the blow-off method is simple in equipment for treating the high-concentration ammonia nitrogen wastewater, can recover ammonia, but has higher requirements on the environment, limited blow-off efficiency, large material consumption and high cost; the breakpoint chlorination method can completely remove ammonia nitrogen theoretically through certain control, but has the reasons of large chlorine adding amount, high cost, generated byproducts and the like, and the method can only be used for the subsequent treatment of wastewater at present; the nitrification and denitrification are the most widely applied denitrification mode, the process is mature, the denitrification effect is good, but the process flow is long, the occupied area is large, an additional carbon source is often needed, the energy consumption is large, and the cost is high.
Therefore, the method for treating the ammonia nitrogen wastewater, which can reduce the treatment cost of the ammonia nitrogen wastewater and has a good treatment effect on the ammonia nitrogen wastewater, and can finish the treatment of the ammonia nitrogen wastewater only by using equipment with a small volume, is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the ammonia nitrogen wastewater treatment method and the ammonia nitrogen wastewater treatment system which have the advantages of low ammonia nitrogen wastewater treatment cost and good ammonia nitrogen wastewater treatment effect and can finish the ammonia nitrogen wastewater treatment by using equipment with small volume.
The purpose of the invention is realized by the following technical scheme:
a method for treating ammonia nitrogen wastewater,
the method comprises the following steps:
circulating the etching solution in the etching solution tank and the electrolytic tank;
carrying out electrolysis operation on the etching solution in the electrolytic bath;
performing air extraction operation in the electrolytic cell to obtain chlorine;
detecting the copper content of the etching solution in the etching solution tank, stopping electrolysis operation if the concentration of copper ions is 120-130 g/l, and adjusting preset components of the etching solution to obtain a PCB etching solution; if the concentration of the copper ions is more than 130g/l, continuing the electrolysis operation;
circulating the ammonia nitrogen wastewater in an ammonia nitrogen wastewater collecting tank and an absorption tank; and
and introducing the chlorine into the ammonia nitrogen wastewater in the absorption tank to carry out ammonia nitrogen removal operation.
In one embodiment, the ammonia nitrogen removal operation specifically comprises the following steps:
adjusting the pH value of the ammonia nitrogen wastewater in the absorption tank to 11.0-11.8;
introducing the chlorine gas into the absorption tank;
and stirring the ammonia nitrogen wastewater.
In one embodiment, in the process of circulating the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collection tank and the absorption tank, a liquid level controller is adopted to control the liquid level height of the ammonia nitrogen wastewater in the absorption tank to be 1/4-1/3 of the total height of the absorption tank.
In one embodiment, the circulating of the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collecting tank and the absorption tank specifically comprises the following steps:
cooling the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collection tank;
filtering the cooled ammonia nitrogen wastewater;
and circulating the filtered ammonia nitrogen wastewater in an ammonia nitrogen wastewater collecting tank and an absorption tank.
An ammonia nitrogen wastewater treatment system comprises:
the etching box is provided with an etching liquid tank, and the etching liquid tank is used for containing etching liquid;
a first circulation pump;
the electrolytic tank is provided with an electrolytic tank, the electrolytic tank is connected with the etching tank through the first circulating pump, the electrolytic tank is used for electrolyzing to generate chlorine, and the first circulating pump is used for circulating the etching solution in the etching solution tank and the electrolytic tank;
an absorption tank for absorbing chlorine gas;
a first conduit;
a second conduit;
an air inlet of the air pump is communicated with the electrolytic bath through the first pipeline, and an air outlet of the air pump is communicated with the absorption tank through the second pipeline;
the copper ion detector is arranged in the etching solution tank and is used for obtaining the copper ion concentration of the etching solution;
a second circulation pump; and
the ammonia nitrogen waste water collecting tank, the ammonia nitrogen waste water collecting tank pass through the second circulating pump with the adsorption tank is connected, the ammonia nitrogen waste water collecting tank is used for placing ammonia nitrogen waste water, the second circulating pump is used for making ammonia nitrogen waste water at ammonia nitrogen waste water collecting tank and adsorption tank inner loop.
In one embodiment, the treatment system for ammonia nitrogen wastewater further comprises a pH regulator, wherein the pH regulator is arranged in the absorption tank and is used for adjusting the pH value of the ammonia nitrogen wastewater in the absorption tank.
In one embodiment, the ammonia nitrogen wastewater treatment system further comprises a liquid level controller, wherein the liquid level controller is arranged in the absorption tank and used for controlling the liquid level of the ammonia nitrogen wastewater in the absorption tank.
In one embodiment, the treatment system for ammonia nitrogen wastewater further comprises a filter, and the filter is respectively connected with the second circulating pump and the ammonia nitrogen wastewater collecting tank.
In one of them embodiment, the processing system of ammonia nitrogen waste water still includes the cooling water backward flow ware, the cooling water backward flow ware includes cooling water net, first water pump and refrigeration water tank, the inlet of cooling water net is passed through the third pipeline and is connected with first water pump, the liquid outlet of cooling water net pass through the fourth pipeline with refrigeration water tank connects, first water pump with refrigeration water tank connects, the cooling water net sets up the water inlet department of filter.
In one embodiment, the treatment system for ammonia nitrogen wastewater further comprises a second water pump, wherein a liquid inlet of the second water pump is communicated with the absorption tank, and a liquid outlet of the second water pump is communicated with the electrolytic bath.
Compared with the prior art, the invention has at least the following advantages:
1. according to the ammonia nitrogen wastewater treatment method, the etching solution is used for electrolytically recovering copper and generating chlorine, and the treated etching solution is adjusted by preset components to obtain the PCB etching solution which can be continuously used for PCB etching, so that the cyclic utilization of the etching solution is realized;
2. according to the ammonia nitrogen wastewater treatment method, the ammonia nitrogen is removed from the ammonia nitrogen wastewater by directly utilizing the chlorine generated by the etching solution for recovering copper, so that the chlorine generated by the etching solution for recovering copper is reused for removing ammonia nitrogen from the ammonia nitrogen wastewater, and the treatment cost of the ammonia nitrogen wastewater is reduced;
3. according to the ammonia nitrogen wastewater treatment method, a large amount of chlorine generated by recovering copper by using the etching solution is used for removing ammonia nitrogen from the ammonia nitrogen wastewater in the absorption tank, so that the ammonia nitrogen removal effect of the ammonia nitrogen wastewater is improved;
4. according to the ammonia nitrogen wastewater treatment method, the etching solution is circulated in the etching solution tank and the electrolytic bath, so that the occupied space for uniformly placing the etching solution is reduced, and the etching solution is circulated in the etching solution tank and the electrolytic bath in the electrolytic operation process, so that the occupied space for electrolytic operation is reduced; make ammonia nitrogen waste water at ammonia nitrogen waste water collecting pit and adsorption tank mesocycle, reduced the unified occupation of land space of placing of ammonia nitrogen waste water, and remove ammonia nitrogen in-process with ammonia nitrogen waste water at ammonia nitrogen waste water collecting pit and adsorption tank mesocycle, reduced the required occupation of land space of ammonia nitrogen waste water treatment, and then reduced ammonia nitrogen waste water treatment equipment's volume, realized only needing to utilize less bulky equipment can accomplish ammonia nitrogen waste water treatment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart showing the steps of a method for treating ammonia nitrogen wastewater according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an ammonia nitrogen wastewater treatment system according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a cooling water network of the ammonia nitrogen wastewater treatment system shown in FIG. 2.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The application provides an ammonia nitrogen wastewater treatment method, which comprises the following steps: circulating the etching solution in the etching solution tank and the electrolytic tank; carrying out electrolysis operation on the etching solution in the electrolytic bath; performing air extraction operation in the electrolytic cell to obtain chlorine; detecting the copper content of the etching solution in the etching solution tank, stopping electrolysis operation if the concentration of copper ions is 120-130 g/l, and adjusting preset components of the etching solution to obtain PCB etching solution; if the concentration of the copper ions is more than 130g/l, continuing the electrolysis operation; circulating the ammonia nitrogen wastewater in an ammonia nitrogen wastewater collecting tank and an absorption tank; and introducing chlorine into the ammonia nitrogen wastewater in the absorption tank to carry out ammonia nitrogen removal operation.
In the ammonia nitrogen wastewater treatment method, the etching solution is used for electrolyzing and recovering copper and generating chlorine, and the treated etching solution is adjusted by preset components to obtain the PCB etching solution which can be continuously used for PCB etching, so that the cyclic utilization of the etching solution is realized. The chlorine generated by the etching solution for recovering the copper is directly utilized to remove ammonia nitrogen from the ammonia nitrogen wastewater, so that the chlorine generated by the etching solution for recovering the copper is reused for removing ammonia nitrogen from the ammonia nitrogen wastewater, and the treatment cost of the ammonia nitrogen wastewater is reduced. A large amount of chlorine generated by recovering copper by using the etching solution removes ammonia nitrogen from the ammonia nitrogen wastewater in the absorption tank, thereby improving the ammonia nitrogen removal effect of the ammonia nitrogen wastewater. The etching solution is circulated in the etching solution tank and the electrolytic tank, so that the occupied space for uniformly placing the etching solution is reduced, and the etching solution is circulated in the etching solution tank and the electrolytic tank in the electrolytic operation process, so that the occupied space for electrolytic operation is reduced; make ammonia nitrogen waste water at ammonia nitrogen waste water collecting pit and adsorption tank mesocycle, reduced the unified occupation of land space of placing of ammonia nitrogen waste water, and remove ammonia nitrogen in-process with ammonia nitrogen waste water at ammonia nitrogen waste water collecting pit and adsorption tank mesocycle, reduced the required occupation of land space of ammonia nitrogen waste water treatment, and then reduced ammonia nitrogen waste water treatment equipment's volume, realized only needing to utilize less bulky equipment can accomplish ammonia nitrogen waste water treatment.
In order to better understand the ammonia nitrogen wastewater treatment method of the present application, the ammonia nitrogen wastewater treatment method of the present application is further explained below, referring to fig. 1, and an embodiment of the ammonia nitrogen wastewater treatment method comprises the following steps:
s100, circulating the etching solution in the etching solution tank and the electrolytic tank. It can be understood that the etching solution circularly flows in the etching solution tank and the electrolytic bath, on one hand, the total concentration of copper ions and chloride ions of the etching solution in the etching solution tank and the electrolytic bath is kept to be reduced step by step in the flowing process of the etching solution, which is beneficial to the step by step adjustment of the current in the electrolytic bath, saves the energy consumption and reduces the treatment cost; on the other hand, the etching solution is respectively stored in the etching solution tank and the electrolytic bath, which is equivalent to that the etching solution tank and the electrolytic bath are both used for storing the etching solution, so that the total occupied space of the etching solution tank and the electrolytic bath is reduced, and the treatment of the ammonia nitrogen wastewater can be completed only by using equipment with smaller volume.
S200, carrying out electrolysis operation on the etching solution in the electrolytic bath. It can be understood that the electrolytic bath is provided with the anode post and the cathode post, the electrolytic operation is carried out on the etching solution after the electrolytic bath is electrified, copper is separated out on the surface of the anode post in the electrolytic operation process, chlorine is generated at the cathode post, the copper can be effectively recovered through the electrolytic operation, the recovery rate of the copper is improved, the chlorine is generated, the chlorine is used for removing ammonia nitrogen in ammonia nitrogen wastewater, the chlorine after the copper is recovered is recycled, the treatment cost of the ammonia nitrogen wastewater is reduced, and the environmental protection is improved.
S300, performing air extraction operation in the electrolytic cell to obtain chlorine. It can be understood that a large amount of chlorine generated in the electrolytic cell needs to be pumped into the ammonia nitrogen wastewater to remove ammonia nitrogen in the ammonia nitrogen wastewater, namely, a large amount of chlorine is used for removing ammonia nitrogen in the ammonia nitrogen wastewater, so that the ammonia nitrogen removal effect of the ammonia nitrogen wastewater is improved.
S400, detecting the copper content of the etching solution in the etching solution tank, stopping electrolysis operation if the concentration of copper ions is 120-130 g/l, and adjusting preset components of the etching solution to obtain PCB etching solution; if the concentration of copper ions is greater than 130g/l, the electrolysis operation is continued. It can be understood that the etching solution contains a large amount of copper ions and chloride ions, the concentration of the copper ions and chloride ions in the etching solution after electrolysis is greatly reduced, when the concentration of the copper ions is 120g/l to 130g/l, the concentration of the copper ions in the etching solution is met, at this time, further electrolysis of the etching solution is stopped, and the preset component adjustment is performed on the etching solution to obtain the PCB etching solution, so that the cyclic utilization of the etching solution is completed, if the detection of the copper ions is not performed, the over electrolysis of the etching solution is easily caused, so that the concentrations of the copper ions and chloride ions in the etching solution after electrolysis are both lower than those of the copper ions and chloride ions in the PCB etching solution, the addition of the copper ions is increased when the preset component adjustment is performed on the etching solution, the energy consumption of the over electrolysis is wasted in the electrolysis process, and the treatment cost of the ammonia nitrogen wastewater is increased, therefore, the copper content of the etching solution in the etching solution tank is detected by adopting a copper ion detector in the step, the problems of excessive electrolysis and increased copper ion consumption are avoided, and the treatment cost of the ammonia nitrogen wastewater is reduced.
S500, circulating the ammonia nitrogen wastewater in an ammonia nitrogen wastewater collecting tank and an absorption tank. It can be understood that, make ammonia nitrogen waste water circulate in ammonia nitrogen waste water collecting pit and adsorption tank, keep ammonia nitrogen overall concentration in the adsorption tank to descend step by step, make ammonia nitrogen overall concentration in the adsorption tank and the concentration of chlorion in the electrolysis trough be direct ratio relation, the treatment rate and the treatment effect of ammonia nitrogen waste water have been improved, and make ammonia nitrogen waste water deposit respectively in ammonia nitrogen waste water collecting pit and adsorption tank, be equivalent to ammonia nitrogen waste water collecting pit and adsorption tank all are used for depositing ammonia nitrogen waste water, the occupation of land space of ammonia nitrogen waste water collecting pit and adsorption tank totality has been reduced, it can accomplish ammonia nitrogen waste water treatment only to need to utilize less bulky equipment to have realized.
S600, introducing chlorine into the ammonia nitrogen wastewater in the absorption tank, and removing ammonia nitrogen. The method can be understood that the air extracting pump performs air extracting operation, and the obtained chlorine is led into the absorption tank, so that the chlorine generated in the electrolytic cell reacts with the ammonia nitrogen wastewater, the ammonia nitrogen in the ammonia nitrogen wastewater is generated into nitrogen, and the ammonia nitrogen in the ammonia nitrogen wastewater is removed.
It should be noted that when ammonia gas is introduced into the absorption tank, if the content of chlorine gas is large and the content of ammonia nitrogen in ammonia nitrogen wastewater is small, chlorine gas is easily dissolved in alkaline water to generate a large amount of hypochlorite, and the dissolution of chlorine gas in alkaline water to generate hypochlorite is an exothermic reaction, and as the temperature of the solution rises and the chlorate is not consumed, the decomposition of hypochlorite can be caused to generate oxygen and chlorate, so that the utilization rate of chlorine gas is reduced. If the chlorine content is small and the ammonia nitrogen content in the ammonia nitrogen wastewater is large, the ammonia nitrogen removal speed of the ammonia nitrogen wastewater is reduced due to insufficient chlorine, and the ammonia nitrogen removal effect in the ammonia nitrogen wastewater is poor due to insufficient chlorine, so that the etching solution and the ammonia nitrogen wastewater circularly flow, the chlorine content in the etching solution and the ammonia nitrogen content in the ammonia nitrogen wastewater are correspondingly reduced step by step, and the ammonia nitrogen removal effect and speed in the ammonia nitrogen wastewater are improved.
In the ammonia nitrogen wastewater treatment method, the etching solution is used for electrolyzing and recovering copper and generating chlorine, and the treated etching solution is adjusted by preset components to obtain the PCB etching solution which can be continuously used for PCB etching, so that the cyclic utilization of the etching solution is realized. The chlorine generated by the etching solution for recovering the copper is directly utilized to remove ammonia nitrogen from the ammonia nitrogen wastewater, so that the chlorine generated by the etching solution for recovering the copper is reused for removing ammonia nitrogen from the ammonia nitrogen wastewater, and the treatment cost of the ammonia nitrogen wastewater is reduced. A large amount of chlorine generated by recovering copper by using the etching solution removes ammonia nitrogen from the ammonia nitrogen wastewater in the absorption tank, thereby improving the ammonia nitrogen removal effect of the ammonia nitrogen wastewater. The etching solution is circulated in the etching solution tank and the electrolytic tank, so that the occupied space for uniformly placing the etching solution is reduced, and the etching solution is circulated in the etching solution tank and the electrolytic tank in the electrolytic operation process, so that the occupied space for electrolytic operation is reduced; make ammonia nitrogen waste water at ammonia nitrogen waste water collecting pit and adsorption tank mesocycle, reduced the unified occupation of land space of placing of ammonia nitrogen waste water, and remove ammonia nitrogen in-process with ammonia nitrogen waste water at ammonia nitrogen waste water collecting pit and adsorption tank mesocycle, reduced the required occupation of land space of ammonia nitrogen waste water treatment, and then reduced ammonia nitrogen waste water treatment equipment's volume, realized only needing to utilize less bulky equipment can accomplish ammonia nitrogen waste water treatment.
In one embodiment, the ammonia nitrogen removal operation specifically comprises the following steps:
and adjusting the pH value of the ammonia nitrogen wastewater in the absorption tank to 11.0-11.8. It can be understood that when the PH of the ammonia nitrogen wastewater is 11.0-11.8, the absorption capacity of chlorine is improved, and the ammonia nitrogen removal effect of the ammonia nitrogen wastewater is improved.
Chlorine gas is introduced into the absorption tank.
And stirring the ammonia nitrogen wastewater. It can be understood that the stirring operation is carried out on the ammonia nitrogen wastewater, the contact area of the ammonia nitrogen wastewater and the chlorine gas is increased, the combination speed of the ammonia nitrogen wastewater and the chlorine gas is increased, and the treatment speed of the ammonia nitrogen wastewater is increased.
It can be understood that the liquid level of the ammonia nitrogen wastewater is in contact with chlorine gas, the liquid level of the ammonia nitrogen wastewater is related to the absorption amount of the chlorine gas, if the liquid level area of the ammonia nitrogen wastewater is increased, the total floor area of an ammonia nitrogen wastewater treatment device is increased, if the total floor area of the ammonia nitrogen wastewater treatment device is reduced, the liquid level area of the ammonia nitrogen wastewater is smaller, the treatment time of the ammonia nitrogen wastewater is increased, and the treatment speed of the ammonia nitrogen wastewater is reduced. It can be understood that, when the liquid level was 1/4 ~ 1/3 of adsorption tank gross height, ammonia nitrogen waste water had more stirring space, and contained 3/4 ~ 2/3's of adsorption tank gross volume chlorine in the adsorption tank, when stirring ammonia nitrogen waste water, ammonia nitrogen waste water can fully contact with chlorine, has improved ammonia nitrogen's treatment effect and treatment rate in the ammonia nitrogen waste water.
In one embodiment, the method for circulating the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collecting tank and the absorption tank comprises the following steps:
and cooling the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collection tank. It can be understood that, before ammonia nitrogen waste water in the ammonia nitrogen waste water collecting tank gets into the adsorption tank, need carry out cooling treatment to ammonia nitrogen waste water, cooling treatment's effect is the solubility that reduces impurity in the ammonia nitrogen waste water, impurity influence ammonia nitrogen waste water except that ammonia nitrogen effect problem in the ammonia nitrogen waste water has been avoided, and the solubility that reduces the temperature and can not reduce ammonia nitrogen compound, ammonia nitrogen waste water treatment's wide adaptability has been improved, all have better removal ammonia nitrogen effect to the ammonia nitrogen waste water that the different mode produced promptly.
And (4) filtering the cooled ammonia nitrogen wastewater. The method has the advantages that after the solubility of impurities is reduced, the impurities are precipitated and separated from the ammonia nitrogen wastewater by using the filter, so that the problem that the impurities in the ammonia nitrogen wastewater influence the ammonia nitrogen removal effect of the ammonia nitrogen wastewater is solved, the interference of the impurities on the detection of copper ions is reduced, and the precision of the detection of the copper content is improved; and the filter filters the particulate matters in the ammonia nitrogen wastewater, so that the problem that the particulate matters in the ammonia nitrogen wastewater block a liquid conveying channel of ammonia nitrogen wastewater treatment equipment is avoided, and the anti-blocking effect in the circulating process is favorably improved.
And circulating the filtered ammonia nitrogen wastewater in an ammonia nitrogen wastewater collecting tank and an absorption tank.
It is noted that the liquid transport channel of the ammonia nitrogen wastewater treatment equipment comprises an etching liquid tank, a first circulating pump, an electrolytic tank, an absorption tank, an air suction pump, a connecting pipeline between a copper ion detector and an ammonia nitrogen wastewater collection tank or the connecting pipeline itself.
In one embodiment, the operation of adjusting the preset components is as follows: and (3) detecting the substance and the content of the substance of the etching solution, and adding hydrochloric acid, ammonium chloride or sodium chloride according to the components of the PCB etching solution. It can be understood that the predetermined composition is adjusted to mainly supplement the insufficient or missing components of the PCB etching solution, so that the PCB etching solution has an etching effect.
In one embodiment, the etching solution is an acidic etching solution. It can be understood that the acidic etching solution has high recovery rate and low cost for recovering copper through electrolysis, can form a large amount of chlorine after electrolysis, can be directly used for PCB etching through preset component adjustment after electrolysis, and realizes the recycling of the etching solution.
In one embodiment, the etching solution is an alkaline etching solution. It can be understood that copper and chlorine are generated in the electrolytic process of the alkaline etching solution, and in order to prevent the chlorine from re-dissolving the copper to form copper ions, in this step, the chlorine also needs to be pumped out by an air pump and then introduced into the absorption tank, so as to perform ammonia nitrogen removal treatment on the ammonia nitrogen wastewater in the absorption tank.
Further, the ammonia nitrogen wastewater and the etching solution are alkaline etching solutions. It can be understood that the alkaline etching solution contains ammonia nitrogen, and ammonia nitrogen removal treatment needs to be carried out on the alkaline etching solution.
Further, the etching solution in the electrolytic bath is introduced into the absorption tank by the second water pump. It can be understood that if the etching solution after the electrolysis operation contains a large amount of ammonia nitrogen, the ammonia nitrogen removal operation needs to be performed on the etching solution, so that the etching solution in the electrolytic bath is introduced into the absorption tank for the ammonia nitrogen removal operation.
Similarly, the alkaline etching solution in the absorption tank also needs to be subjected to a copper recovery operation. When the alkaline etching solution in the absorption tank is refluxed into the electrolytic bath, the effect of copper recovery is lowered, and the alkaline etching solution in the absorption tank contains hypochlorite ions which are a reaction, and the precipitated copper ions are reformed into copper ions, thereby lowering the efficiency of copper recovery.
Furthermore, the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collection tank is guided into the etching liquid tank through a third water pump. It can be understood that, in the process of removing ammonia nitrogen in the ammonia nitrogen wastewater treatment of the alkaline etching solution, copper ions in the alkaline etching solution are not recovered, and the alkaline etching solution is the etching solution and is also the ammonia nitrogen wastewater, so that the alkaline etching solution treated by the ammonia nitrogen wastewater flows back to the etching solution tank, and the copper recovery treatment of the alkaline etching solution treated by the ammonia nitrogen wastewater is realized.
It should be noted that if the alkaline etching solution in the etching solution tank is refluxed into the ammonia nitrogen wastewater collection tank, the ammonia nitrogen and copper removing recovery process cannot be repeated circularly, and the overall occupied space of the ammonia nitrogen wastewater treatment equipment is increased.
In the process of circulating the etching solution in the etching solution tank and the electrolytic tank, the etching solution in the etching solution tank and the electrolytic tank is stirred;
stirring the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collecting tank and the absorption tank in the process of circulating the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collecting tank and the absorption tank.
It can be understood that, foretell etching cistern, the electrolysis trough, all be provided with agitating unit in ammonia nitrogen waste water collecting pit and the adsorption tank, stir the etching solution in etching cistern and the electrolysis trough respectively, and stir the ammonia nitrogen waste water in ammonia nitrogen waste water collecting pit and the adsorption tank, it is even to be favorable to each part's etching solution or each part's ammonia nitrogen waste water in each part's each composition distribution, the local circulation of etching solution or ammonia nitrogen waste water has been avoided, or the problem that the concentration of each composition does not correspond the reduction step by step, ammonia nitrogen removal efficiency of ammonia nitrogen waste water has been improved.
It can be understood that, because the circulation of the etching solution and the ammonia nitrogen wastewater needs to be realized and the components in the etching solution and the ammonia nitrogen wastewater need to be correspondingly reduced step by step, stirring devices are arranged in the etching solution tank, the electrolytic tank, the ammonia nitrogen wastewater collecting tank and the absorption tank for stirring the etching solution or the ammonia nitrogen wastewater, but in the process of stirring the ammonia nitrogen wastewater, particle impurities in the ammonia nitrogen wastewater collecting tank are stirred and brought into the absorption tank to block a liquid conveying channel, and the dissolving amount of other impurities in the ammonia nitrogen wastewater is increased, so that the impurity content in the ammonia nitrogen wastewater is increased, thereby increasing the possibility of the influence of the impurities on the ammonia nitrogen removal effect, therefore, in one embodiment, the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collecting tank is cooled, the ammonia nitrogen wastewater after being cooled is filtered, and the possibility of the influence of the soluble impurities in the ammonia nitrogen wastewater on the ammonia nitrogen removal effect is reduced, and reduces the instances of particulate impurities clogging the liquid transport channels.
The application also provides an ammonia nitrogen wastewater treatment system, and the ammonia nitrogen wastewater treatment method of any embodiment is adopted to treat ammonia nitrogen wastewater. In one embodiment, the ammonia nitrogen wastewater treatment system comprises an etching tank, a first circulating pump, an electrolytic tank, an absorption tank, a first pipeline, a second pipeline, a suction pump, a copper ion detector, a second circulating pump and an ammonia nitrogen wastewater collection tank. The etching liquid tank is provided with an etching liquid groove used for containing etching liquid. The electrolytic tank is provided with an electrolytic tank, the electrolytic tank is connected with the etching tank through a first circulating pump, the electrolytic tank is used for electrolyzing to generate chlorine, and the first circulating pump is used for enabling the etching solution to circulate in the etching solution tank and the electrolytic tank. The absorption tank is used for absorbing chlorine. The air inlet of the air pump is communicated with the electrolytic bath through a first pipeline, and the air outlet of the air pump is communicated with the absorption tank through a second pipeline. The copper ion detector is arranged in the etching solution tank and is used for obtaining the copper ion concentration of the etching solution. The ammonia nitrogen wastewater collecting tank is connected with the absorption tank through a second circulating pump, the ammonia nitrogen wastewater collecting tank is used for placing ammonia nitrogen wastewater, and the second circulating pump is used for enabling the ammonia nitrogen wastewater to circulate in the ammonia nitrogen wastewater collecting tank and the absorption tank.
In the ammonia nitrogen wastewater treatment system, the etching solution circulates in the etching solution tank and the electrolytic bath, so that the occupied space for uniformly placing the etching solution is reduced, and the etching solution circulates in the etching solution tank and the electrolytic bath in the electrolytic operation process, so that the occupied space for electrolytic operation is reduced; make ammonia nitrogen waste water at ammonia nitrogen waste water collecting pit and adsorption tank mesocycle, reduced the unified occupation of land space of placing of ammonia nitrogen waste water, and remove ammonia nitrogen in-process with ammonia nitrogen waste water at ammonia nitrogen waste water collecting pit and adsorption tank mesocycle, reduced the required occupation of land space of ammonia nitrogen waste water treatment, and then reduced ammonia nitrogen waste water treatment equipment's volume, realized only needing to utilize less bulky equipment can accomplish ammonia nitrogen waste water treatment.
It should be noted that, etching cistern, electrolysis trough, absorption tank, aspiration pump, copper ion detector, ammonia nitrogen waste water collecting pit, first pipeline, second pipeline, first circulating pump and second circulating pump are current ammonia nitrogen waste water treatment facility, this application protection etching cistern, electrolysis trough, absorption tank, aspiration pump, copper ion detector, ammonia nitrogen waste water collecting pit, first pipeline, second pipeline, the position relation and the connection relation of first circulating pump and second circulating pump.
For better understanding of the ammonia nitrogen wastewater treatment system 10 of the present application, the ammonia nitrogen wastewater treatment system 10 of the present application is further explained below, referring to fig. 2, and the ammonia nitrogen wastewater treatment system 10 of an embodiment includes an etching tank 100, a first circulation pump 300, an electrolysis tank 200, an absorption tank 400, a first pipeline 600, a second pipeline 700, an air suction pump 500, a copper ion detector, a second circulation pump 110, and an ammonia nitrogen wastewater collection tank 900. The etching solution tank 100 is opened with an etching solution tank 101, and the etching solution tank 101 is used for holding etching solution. The electrolytic tank 200 is provided with an electrolytic tank 201, the electrolytic tank 200 is communicated with the etching solution tank 101 through a first circulating pump 300, the electrolytic tank 201 is used for electrolyzing to generate chlorine, and the first circulating pump 300 is used for circulating the etching solution in the etching solution tank 101 and the electrolytic tank 201. The canister 400 is used to absorb chlorine gas. An air inlet of the air pump 500 is communicated with the electrolytic bath 200 through a first pipe 600, and an air outlet of the air pump 500 is communicated with the absorption tank 400 through a second pipe. A copper ion detector (not shown) is disposed in the etching solution tank 100, and the copper ion detector is used to obtain the copper ion concentration of the etching solution. The ammonia nitrogen wastewater collecting tank 900 is connected with the absorption tank 400 through a second circulating pump 110, the ammonia nitrogen wastewater collecting tank 900 is used for placing ammonia nitrogen wastewater, and the second circulating pump 110 is used for enabling the ammonia nitrogen wastewater to circulate in the ammonia nitrogen wastewater collecting tank 900 and the absorption tank 400.
In the ammonia nitrogen wastewater treatment system 10, the first circulating pump 300 circulates the etching solution in the etching solution tank 101 and the electrolytic tank 201, so that the occupied space for uniformly placing the etching solution is reduced, and the etching solution circulates in the etching solution tank 101 and the electrolytic tank 201 in the electrolytic operation process, so that the occupied space for electrolytic operation is reduced; the second circulating pump 110 enables the ammonia nitrogen wastewater to circulate in the ammonia nitrogen wastewater collecting tank 900 and the absorption tank 400, the occupied space for uniformly placing the ammonia nitrogen wastewater is reduced, the ammonia nitrogen wastewater circulates in the ammonia nitrogen wastewater collecting tank 900 and the absorption tank 400 in the ammonia nitrogen removal process, the occupied space required by ammonia nitrogen wastewater treatment is reduced, the size of ammonia nitrogen wastewater treatment equipment is reduced, and the ammonia nitrogen wastewater treatment can be completed only by using equipment with smaller size.
In one embodiment, the ammonia nitrogen wastewater treatment system 10 further comprises a PH adjuster, which is disposed in the absorption tank 400 and is used for adjusting the PH value of the ammonia nitrogen wastewater in the absorption tank 400, so as to ensure the ammonia nitrogen removal effect on the ammonia nitrogen wastewater.
In one embodiment, the ammonia nitrogen wastewater treatment system 10 further comprises a liquid level controller, wherein the liquid level controller is arranged in the absorption tank 400 and is used for controlling the liquid level of the ammonia nitrogen wastewater in the absorption tank 400, so that the ammonia nitrogen removal effect on the ammonia nitrogen wastewater is ensured.
In one embodiment, the ammonia nitrogen wastewater treatment system 10 further comprises a filter 140, and the filter 140 is connected to the second circulation pump 110 and the ammonia nitrogen wastewater collection tank 900 respectively. It can be understood that the filter 140 is used for filtering the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collecting tank 900, so that the problem that impurities in the ammonia nitrogen wastewater influence the ammonia nitrogen removal effect of the ammonia nitrogen wastewater is avoided, and the problem that particulate matters in the ammonia nitrogen wastewater block a liquid transportation channel of the ammonia nitrogen wastewater treatment equipment is avoided.
Referring to fig. 3, in one embodiment, the ammonia nitrogen wastewater treatment system 10 further includes a cooling water reflux unit, the cooling water reflux unit includes a cooling water network 151, a first water pump and a cooling water tank, a liquid inlet of the cooling water network 151 is connected to the first water pump through a third pipeline 152, a liquid outlet of the cooling water network 151 is connected to the cooling water tank through a fourth pipeline 153, the first water pump is connected to the cooling water tank, and the cooling water network 151 is disposed at a water inlet of the filter 140. It can be understood that, before ammonia nitrogen waste water in ammonia nitrogen waste water collecting pit 900 gets into adsorption tank 400, adopt cooling water backward flow ware to carry out cooling treatment to ammonia nitrogen waste water, cooling treatment's effect is the solubility that reduces impurity in the ammonia nitrogen waste water, impurity influence ammonia nitrogen waste water except that ammonia nitrogen effect problem in the ammonia nitrogen waste water has been avoided, and the reduction temperature can not reduce ammonia nitrogen compound's solubility, ammonia nitrogen waste water treatment's universality has been improved, the ammonia nitrogen effect of removing to the ammonia nitrogen waste water that the different mode produced has been improved promptly.
In one embodiment, the ammonia nitrogen wastewater treatment system 10 further comprises a second water pump 160, wherein a liquid inlet of the second water pump 160 is communicated with the absorption tank 400, and a liquid outlet of the second water pump 160 is communicated with the electrolytic tank 201. It can be understood that if the etching solution after the electrolysis operation contains a large amount of ammonia nitrogen, the ammonia nitrogen removal operation is required for the etching solution, so the etching solution in the electrolytic bath 201 is introduced into the absorption tank 400 for ammonia nitrogen removal operation.
Similarly, the alkaline etching solution in the absorption tank 400 also needs to be subjected to a copper recovery operation. When the alkaline etching solution in the absorption tank 400 is returned to the electrolytic bath 201, the effect of copper recovery is lowered, and the alkaline etching solution in the absorption tank 400 contains hypochlorite ions for reaction, so that the precipitated copper ions are reformed into copper ions, and the efficiency of copper recovery is lowered.
In one embodiment, the ammonia nitrogen wastewater treatment system 10 further comprises a third water pump 170, wherein a liquid inlet of the third water pump 170 is connected with the ammonia nitrogen wastewater collection tank 900, and a liquid outlet of the third water pump 170 is connected with the etching liquid tank 101. It can be understood that, in the process of removing ammonia nitrogen in the ammonia nitrogen wastewater treatment of the alkaline etching solution, copper ions in the alkaline etching solution are not recovered, and the alkaline etching solution is the etching solution and is also the ammonia nitrogen wastewater, so that the alkaline etching solution treated by the ammonia nitrogen wastewater flows back to the etching solution tank 101, and the copper recovery treatment of the alkaline etching solution treated by the ammonia nitrogen wastewater is realized.
It should be noted that if the alkaline etching solution in the etching solution tank 101 is refluxed into the ammonia nitrogen wastewater collection tank 900, the ammonia nitrogen removal and copper recovery process cannot be repeated circularly, and the overall occupied space of the ammonia nitrogen wastewater treatment equipment is increased.
Compared with the prior art, the invention has at least the following advantages:
1. according to the ammonia nitrogen wastewater treatment method, the etching solution is used for electrolytically recovering copper and generating chlorine, and the treated etching solution is adjusted by preset components to obtain the PCB etching solution which can be continuously used for PCB etching, so that the cyclic utilization of the etching solution is realized;
2. according to the ammonia nitrogen wastewater treatment method, the ammonia nitrogen is removed from the ammonia nitrogen wastewater by directly utilizing the chlorine generated by the etching solution for recovering copper, so that the chlorine generated by the etching solution for recovering copper is reused for removing ammonia nitrogen from the ammonia nitrogen wastewater, and the treatment cost of the ammonia nitrogen wastewater is reduced;
3. according to the ammonia nitrogen wastewater treatment method, a large amount of chlorine generated by recovering copper by using the etching solution is used for removing ammonia nitrogen from the ammonia nitrogen wastewater in the absorption tank, so that the ammonia nitrogen removal effect of the ammonia nitrogen wastewater is improved;
4. according to the ammonia nitrogen wastewater treatment method, the etching solution is circulated in the etching solution tank and the electrolytic bath, so that the occupied space for uniformly placing the etching solution is reduced, and the etching solution is circulated in the etching solution tank and the electrolytic bath in the electrolytic operation process, so that the occupied space for electrolytic operation is reduced; make ammonia nitrogen waste water at ammonia nitrogen waste water collecting pit and adsorption tank mesocycle, reduced the unified occupation of land space of placing of ammonia nitrogen waste water, and remove ammonia nitrogen in-process with ammonia nitrogen waste water at ammonia nitrogen waste water collecting pit and adsorption tank mesocycle, reduced the required occupation of land space of ammonia nitrogen waste water treatment, and then reduced ammonia nitrogen waste water treatment equipment's volume, realized only needing to utilize less bulky equipment can accomplish ammonia nitrogen waste water treatment.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The ammonia nitrogen wastewater treatment method is characterized by comprising the following steps:
circulating the etching solution in the etching solution tank and the electrolytic tank;
carrying out electrolysis operation on the etching solution in the electrolytic bath;
performing air extraction operation in the electrolytic cell to obtain chlorine;
detecting the copper content of the etching solution in the etching solution tank, stopping electrolysis operation if the concentration of copper ions is 120-130 g/l, and adjusting preset components of the etching solution to obtain a PCB etching solution; if the concentration of the copper ions is more than 130g/l, continuing the electrolysis operation;
circulating the ammonia nitrogen wastewater in an ammonia nitrogen wastewater collecting tank and an absorption tank; and
and introducing the chlorine into the ammonia nitrogen wastewater in the absorption tank to carry out ammonia nitrogen removal operation.
2. The ammonia nitrogen wastewater treatment method according to claim 1, characterized in that the ammonia nitrogen removal operation specifically comprises the following steps:
adjusting the pH value of the ammonia nitrogen wastewater in the absorption tank to 11.0-11.8;
introducing the chlorine gas into the absorption tank;
and stirring the ammonia nitrogen wastewater.
3. The ammonia nitrogen wastewater treatment method according to claim 1, wherein in the process of circulating the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collection tank and the absorption tank, a liquid level controller is adopted to control the liquid level of the ammonia nitrogen wastewater in the absorption tank to be 1/4-1/3 of the total height of the absorption tank.
4. The ammonia nitrogen wastewater treatment method according to claim 1, wherein the ammonia nitrogen wastewater is circulated in the ammonia nitrogen wastewater collection tank and the absorption tank, and the method comprises the following steps:
cooling the ammonia nitrogen wastewater in the ammonia nitrogen wastewater collection tank;
filtering the cooled ammonia nitrogen wastewater;
and circulating the filtered ammonia nitrogen wastewater in an ammonia nitrogen wastewater collecting tank and an absorption tank.
5. The ammonia nitrogen wastewater treatment system is characterized by comprising:
the etching box is provided with an etching liquid tank, and the etching liquid tank is used for containing etching liquid;
a first circulation pump;
the electrolytic tank is provided with an electrolytic tank, the electrolytic tank is connected with the etching tank through the first circulating pump, the electrolytic tank is used for electrolyzing to generate chlorine, and the first circulating pump is used for circulating the etching solution in the etching solution tank and the electrolytic tank;
an absorption tank for absorbing chlorine gas;
a first conduit;
a second conduit;
an air inlet of the air pump is communicated with the electrolytic bath through the first pipeline, and an air outlet of the air pump is communicated with the absorption tank through the second pipeline;
the copper ion detector is arranged in the etching solution tank and is used for obtaining the copper ion concentration of the etching solution;
a second circulation pump; and
the ammonia nitrogen waste water collecting tank, the ammonia nitrogen waste water collecting tank pass through the second circulating pump with the adsorption tank is connected, the ammonia nitrogen waste water collecting tank is used for placing ammonia nitrogen waste water, the second circulating pump is used for making ammonia nitrogen waste water at ammonia nitrogen waste water collecting tank and adsorption tank inner loop.
6. The ammonia-nitrogen wastewater treatment system of claim 5, further comprising a pH regulator, wherein the pH regulator is arranged in the absorption tank and is used for regulating the pH value of the ammonia-nitrogen wastewater in the absorption tank.
7. The ammonia-nitrogen wastewater treatment system of claim 5, further comprising a liquid level controller, wherein the liquid level controller is arranged in the absorption tank and used for controlling the liquid level of the ammonia-nitrogen wastewater in the absorption tank.
8. The ammonia nitrogen wastewater treatment system of claim 5, further comprising a filter, wherein the filter is connected with the second circulating pump and the ammonia nitrogen wastewater collection tank respectively.
9. The ammonia nitrogen wastewater treatment system of claim 8, further comprising a cooling water reflux device, wherein the cooling water reflux device comprises a cooling water network, a first water pump and a refrigerating water tank, a liquid inlet of the cooling water network is connected with the first water pump through a third pipeline, a liquid outlet of the cooling water network is connected with the refrigerating water tank through a fourth pipeline, the first water pump is connected with the refrigerating water tank, and the cooling water network is arranged at a water inlet of the filter.
10. The ammonia nitrogen wastewater treatment system of any one of claims 5 to 9, further comprising a second water pump, wherein a liquid inlet of the second water pump is communicated with the absorption tank, and a liquid outlet of the second water pump is communicated with the electrolytic bath.
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Application publication date: 20210115 |