CN211664878U - Ammonia nitrogen wastewater treatment device - Google Patents
Ammonia nitrogen wastewater treatment device Download PDFInfo
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- CN211664878U CN211664878U CN201922279871.2U CN201922279871U CN211664878U CN 211664878 U CN211664878 U CN 211664878U CN 201922279871 U CN201922279871 U CN 201922279871U CN 211664878 U CN211664878 U CN 211664878U
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- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 238000004065 wastewater treatment Methods 0.000 title claims description 22
- 239000002351 wastewater Substances 0.000 claims abstract description 101
- 238000006243 chemical reaction Methods 0.000 claims abstract description 47
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 26
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims abstract description 24
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 17
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005273 aeration Methods 0.000 claims abstract description 12
- 238000010992 reflux Methods 0.000 claims abstract description 6
- 229910001868 water Inorganic materials 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 6
- QDHHCQZDFGDHMP-UHFFFAOYSA-N Chloramine Chemical compound ClN QDHHCQZDFGDHMP-UHFFFAOYSA-N 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 238000010979 pH adjustment Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 239000010936 titanium Substances 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 4
- 229910052741 iridium Inorganic materials 0.000 claims description 4
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052707 ruthenium Inorganic materials 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- HJPBEXZMTWFZHY-UHFFFAOYSA-N [Ti].[Ru].[Ir] Chemical compound [Ti].[Ru].[Ir] HJPBEXZMTWFZHY-UHFFFAOYSA-N 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 25
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 23
- 239000000460 chlorine Substances 0.000 description 21
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 18
- 229910052801 chlorine Inorganic materials 0.000 description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 229910021529 ammonia Inorganic materials 0.000 description 11
- 239000000126 substance Substances 0.000 description 11
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- -1 chlorine ions Chemical class 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 8
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 7
- 230000008901 benefit Effects 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000005708 Sodium hypochlorite Substances 0.000 description 6
- 238000006722 reduction reaction Methods 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 229910021536 Zeolite Inorganic materials 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 4
- 239000003607 modifier Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000010457 zeolite Substances 0.000 description 4
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 3
- 235000019270 ammonium chloride Nutrition 0.000 description 3
- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 238000005660 chlorination reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910052567 struvite Inorganic materials 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000009615 deamination Effects 0.000 description 2
- 238000006481 deamination reaction Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000006396 nitration reaction Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- QEHKBHWEUPXBCW-UHFFFAOYSA-N nitrogen trichloride Chemical compound ClN(Cl)Cl QEHKBHWEUPXBCW-UHFFFAOYSA-N 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 1
- 229910021591 Copper(I) chloride Inorganic materials 0.000 description 1
- 239000004267 EU approved acidity regulator Substances 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 1
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000010669 acid-base reaction Methods 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 229960001701 chloroform Drugs 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical compound [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 description 1
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Abstract
The utility model discloses a treatment device for ammonia nitrogen wastewater, which comprises a pH adjusting unit and an electrolysis reaction unit. The pH adjusting unit receives the ammonia nitrogen wastewater and adjusts the pH; the electrolysis reaction unit receives the ammonia nitrogen wastewater from the pH adjusting unit and carries out electrolysis to generate hypochlorite (ClO)‑) And chloride ion (Cl)‑) And generating carbonic acid (H) after aeration2CO3) Carbonic acid under weakly acidic conditionsFurther reacts with hypochlorite to generate hypochlorous acid (HClO), wherein the hypochlorite, chloride ions and the hypochlorous acid continuously oxidize the ammonia nitrogen wastewater to generate nitrogen (N)2) And removing, and refluxing part of ammonia nitrogen wastewater after the reaction to the pH adjusting unit, and adjusting the pH of the pH adjusting unit.
Description
Technical Field
The utility model relates to a processing apparatus of ammonia nitrogen waste water, especially a processing apparatus of ammonia nitrogen waste water who uses electrolysis mode discharge nitrogen gas after the adjustment pH.
Background
Since the global natural nitrogen balance is affected by industrial emissions and human activity emissions in recent years, serious unbalance is caused in the harm of ammonia Nitrogen (NH)4 +N) increases the biotoxicity of the bearing water body after being discharged into the water body, and consumes dissolved oxygen in the bearing water body to cause damage to the water body environment. The ammonia nitrogen wastewater discharge of each industry is different due to different processes, such as the ammonia nitrogen concentration, whether organic matters, organic nitrogen and the like are contained or not, meanwhile, the problems of land occupation size, operation feasibility and the like are also involved in the selection of treatment programs, more factors need to be considered in the selection of the treatment programs compared with the treatment of common organic matters, and the existing effective ammonia nitrogen wastewater treatment method can be divided into physical treatment, biological treatment, chemical treatment and the like according to different operation principles.
Among the existing physical treatment methods, a membrane separation method and a zeolite deamination method can be used. In the membrane separation method, NH is separated by adjusting the pH value of water4Conversion to NH3The selective permeability of the membrane is utilized to remove ammonia nitrogen, but the method needs to recover and treat the finally produced ammonium sulfate concentrated solution; in the zeolite deamination method, cations in zeolite and NH in wastewater are utilized4The exchange is carried out for the purpose of denitrification, but because of the problem of saturation of concentration, the method is generally used for treating low-concentration ammonia-containing wastewater or wastewater containing trace heavy metals, and the used zeolite has the problem of regeneration treatment.
In the existing biological treatment method, the ammonia nitrogen in water is mainly oxidized and reduced through various microorganism groups of different types to perform physiological metabolism, the conversion of ammonia nitrogen comprises nitrite nitrogen, nitrate nitrogen and the like, and the final treated product is usually nitrogen (N)2). Common biological treatment methods include ammonia oxidation, nitrous acid oxidation, nitric acid reduction, anaerobic ammonia oxidation, and the like. When the biological treatment method is used for treating ammonia nitrogen wastewater, an important factor to be considered is whether the wastewater simultaneously contains organic matters, and if the wastewater simultaneously contains the organic matters, the ammonia oxidation reaction and the nitrate can be utilizedThe acid reduction reaction is used for carrying out the nitration/denitrification reaction to achieve the aim of removing ammonia nitrogen, or the nitric acid reduction reaction is used for carrying out the semi-nitration/denitrification reaction, and also can achieve the aim of removing ammonia nitrogen, if the concentration of organic matters in the wastewater is insufficient or trace, the anaerobic ammonia oxidation reaction is mainly used for carrying out ammonia nitrogen wastewater treatment.
In the existing chemical treatment method, different methods are adopted according to the concentration of ammonia nitrogen in the wastewater, and under the condition of low concentration of ammonia nitrogen in the wastewater, the purpose of removing the ammonia nitrogen in the wastewater by converting the ammonia nitrogen into nitrogen by using a breakpoint chlorination method is achieved; when high-concentration ammonia nitrogen wastewater is treated, struvite precipitation can be selected, ammonia nitrogen is formed into solids, and then the ammonia nitrogen is removed, however, when the struvite treatment is carried out by a chemical coagulation procedure, a large amount of struvite glue is easily generated, and the treatment cost is increased.
The basic principle of the existing breakpoint chlorine adding method for removing ammonia is to utilize chlorine (Cl)2) Or sodium hypochlorite reacts with ammonia to generate harmless nitrogen, although the method has the advantages of no influence of water temperature on operation, simple operation method and the like, the requirements on the aspects of safe use and storage and pH control of liquid chlorine are strict, in addition, a large amount of alkali needs to be added in the treatment process, and under the condition of high alkali addition amount, the operation cost for treating the high-concentration ammonia nitrogen wastewater does not accord with economic benefits.
Based on the bottleneck of above-mentioned prior art, the utility model provides an ammonia nitrogen effluent treatment plant can effective treatment ammonia nitrogen waste water, simultaneously reduce cost to do not produce discarded object or secondary product after handling.
SUMMERY OF THE UTILITY MODEL
The utility model provides an ammonia nitrogen wastewater treatment device, after ammonia nitrogen wastewater is treated, can not produce discarded object or secondary product.
The utility model provides an ammonia nitrogen wastewater treatment device, in order to solve prior art, the use and the control of storing safety, pH about liquid chlorine require high and add the alkali gauge height, lead to the treatment cost to rise, be not conform to economic benefits scheduling problem.
The utility model discloses an embodiment provides an ammonia nitrogen effluent treatment plant contains a pH adjustment unit and an electrolysis reaction unit. The pH adjusting unit receives the ammonia nitrogen wastewater and adjusts the pH; the electrolysis reaction unit receives the ammonia nitrogen wastewater from the pH adjusting unit, electrolyzes the ammonia nitrogen wastewater to generate hypochlorite and chloride ions, generates carbonic acid after aeration, and further reacts with the hypochlorite to generate hypochlorous acid under the condition of weak acidity, wherein the hypochlorite, the chloride ions and the hypochlorous acid continuously oxidize the ammonia nitrogen wastewater to enable the ammonia nitrogen wastewater to generate nitrogen and be discharged, and part of the ammonia nitrogen wastewater after the reaction is returned to the pH adjusting unit, and the pH of the pH adjusting unit is adjusted. The electrolytic reaction unit is provided with an anode and a cathode, wherein the anode is made of ruthenium or iridium materials, and the cathode is made of stainless steel or titanium materials.
According to the ammonia nitrogen wastewater treatment device provided by the embodiment, the pH adjusting unit adjusts the pH according to the added acid-base adjustment substance and the returned ammonia nitrogen wastewater. The returned ammonia nitrogen wastewater is in weak acidity, so that the use amount of added regulators can be reduced, and the ammonia nitrogen wastewater is more elastic in pH control. In addition, in the process of oxidizing the ammonia nitrogen wastewater, chlorine ions such as hypochlorite, chlorine ions and hypochlorous acid are generated from electrolysis reaction in the electrolysis reaction and after aeration, and no additional chlorine ions are needed. Therefore, the problems of high treatment cost, non-conformity with economic benefit and the like caused by safe use and storage of liquid chlorine, high requirement on pH control and high alkali addition in the prior art can be solved, and simultaneously, waste or secondary products cannot be generated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of an ammonia nitrogen wastewater treatment apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view of an apparatus for treating ammonia nitrogen wastewater according to another embodiment of the present invention;
description of reference numerals: 10-ammonia nitrogen wastewater treatment device; 100-a pH adjusting unit; 200-an electrolysis reaction unit; 210-an anode; 220-a cathode; 300-ammonia nitrogen wastewater; m-a stirring member; a-an aeration device; b-a reflux water pumping area.
Detailed Description
An embodiment of the present invention will be described with reference to fig. 1. Fig. 1 is a schematic view of an ammonia nitrogen wastewater treatment device according to an embodiment of the present invention.
The ammonia nitrogen wastewater treatment apparatus 10 of the present embodiment is used for treating wastewater containing ammonia nitrogen. The source of the ammonia nitrogen-containing sewage and wastewater is, but not limited to, domestic sewage, high-tech industry, petrochemical industry, chemical industry and the like. The ammonia nitrogen wastewater treatment device 10 comprises a pH adjusting unit 100 and an electrolytic reaction unit 200. The pH adjusting unit 100 receives ammonia nitrogen wastewater 300, and the flowing direction of the ammonia nitrogen wastewater 300 is shown by a long-short dashed line in the figure; the electrolysis reaction unit 200 comprises an anode 210 and a cathode 220, and receives the ammonia nitrogen wastewater 300 from the pH adjustment unit 100. Wherein, the ammonia nitrogen wastewater 300 can flow back to the pH adjusting unit after being treated by the electrolytic reaction unit 200. In other words, the ammonia nitrogen wastewater 300 passes through the pH adjusting unit 100, then passes through the electrolytic reaction unit 200 for treatment, and finally flows back to the pH adjusting unit to form a circulation.
In detail, the ammonia nitrogen wastewater 300 is received by the pH adjusting unit 100, and the pH adjusting unit 100 adjusts the pH value of the ammonia nitrogen wastewater 300 to keep the pH value of the ammonia nitrogen wastewater 300 at a proper value. The pH adjusting unit 100 may adjust the pH of the ammonia nitrogen wastewater 300 by adding acidic and alkaline modifiers. Commonly used acidity regulators are for example but not limited to sulfuric acid (H)2SO4) Hydrochloric acid (HCl), and alkaline modifiers such as, but not limited to, sodium hydroxide (NaOH). It should be noted that, since the ammonia nitrogen wastewater 300 is weak acidic when finally reflowing to the pH adjusting unit 200, it can assist in adjusting the pH value of the pH adjusting unit 200, and therefore, it is necessary to add additional componentsThe acidity regulator (c) is also reduced. In other words, the reason why the pH value of the ammoniacal nitrogen wastewater 300 in the pH adjusting unit 100 is determined by the added acidic and alkaline modifiers and the returned ammoniacal nitrogen wastewater 300 and the pH value of the ammoniacal nitrogen wastewater 300 needs to be kept at a proper value is that the reaction condition of the electrolysis reaction is between 4.5 and 6.5, so that the ammoniacal nitrogen wastewater 300 needs to be adjusted to a proper state before entering the electrolysis reaction unit 200 for the subsequent reaction to proceed, that is, the pH value of the ammoniacal nitrogen wastewater in the pH adjusting unit 100 needs to be kept at a state of 6 to 7.5.
Further, the pH adjusting unit 100 may include a stirring member M. The stirring member M can assist in mixing the acidic and alkaline modifiers with the ammonia-nitrogen wastewater 300, and accelerate the acid-base reaction in the pH adjusting unit 100. After being treated by the pH adjusting unit 100, the ammonia nitrogen wastewater 300 enters the electrolysis reaction unit 200 for subsequent treatment.
After receiving the ammonia nitrogen wastewater 300 from the pH adjusting unit 100, the electrolysis reaction unit 200 performs a series of reactions to remove the ammonia nitrogen in the ammonia nitrogen wastewater 300 after generating nitrogen. The reaction includes an electrolytic reaction to generate hypochlorous acid, sodium hypochlorite and chloride ions, and generates carbonic acid after aeration, under the weak acidic condition, the carbonic acid further reacts with hypochlorite to generate hypochlorous acid, and the hypochlorite, the chloride ions and the hypochlorous acid continuously oxidize the ammonia nitrogen wastewater to enable the ammonia nitrogen wastewater 300 to generate chloramine (NH)2Cl) is finally oxidized to ammonia and removed. The detailed reaction is described later:
the electrolytic reaction formula of the ammonia nitrogen wastewater 300 comprises:
2NaCl+2H2O→2NaOH+H2↑+Cl2(ii) a And
2NaOH+Cl2→NaClO+NaCl+H2O。
as shown in the above reaction formula, in the electrolytic reaction, sodium chloride (NaCl) and water (H)2O) to produce sodium hydroxide and chlorine, followed by reaction of the sodium hydroxide and chlorine to produce sodium hypochlorite, sodium chloride, and water. It is noted that in the electrolysis reaction of the general ammonia nitrogen wastewater, chemical substances containing chloride ions are additionally added to the ammonia nitrogen wastewaterAs a source of chloride ions in the reactants, for example, sodium chloride is added, or ferric chloride (FeCl) is used in the process by many industries3) Copper chloride (CuCl)2) Ammonium chloride (NH)4Cl), hydrochloric acid, and the like. However, in this embodiment, the chemical substance containing chloride ions is directly used to perform the electrolysis reaction without adding any additional chemical substance containing chloride ions.
As mentioned above, the source of the waste water containing ammonia nitrogen is domestic sewage, high-tech industry, petrochemical industry, chemical industry, etc., and before treating ammonia nitrogen, the waste water is first treated by chemical precipitation to remove heavy metals and fluoride ions (F) in the waste water-) With Suspended Solids (SS), coagulating agent used in coagulating sedimentation process such as ferric Chloride, polyaluminum Chloride (polyaluminum Chloride), calcium Chloride (CaCl)2) Can be used as the source of chloride ions. In addition, ammonium chloride (NH4Cl) used in batteries, accumulators, PCBs, electroplating, leather, metal surface pickling, semiconductor processes, etc. is also a source of chloride ions in wastewater. Furthermore, a large amount of chloride ions are contained in waste water such as leakage water from landfills and washing of incineration bottom slag. Therefore, in the present embodiment, the chlorine ions existing in the wastewater are used as the source of the chlorine ions in the electrolysis reaction, and no additional chemicals are required.
The electrolytic reaction unit 200 has an anode 210 and a cathode 220, and the anode and the cathode are alternately arranged, that is, the anode and the cathode are alternately arranged in a manner that one anode is matched with the other cathode, and the anode and the cathode are in a shape such as but not limited to a plate, a mesh, a strip, and the like. The anode is made of ruthenium or iridium material, and the cathode is made of stainless steel or titanium material. In more detail, the anode is a ruthenium iridium titanium anode. The ruthenium iridium titanium anode is used for generating sodium hypochlorite by electrolysis, and the anode material selects a coating titanium electrode and a mixed oxide coating. The use of ruthenium or iridium as the anode has the advantages of long service life, low overpotential, and high chlorine evolution current efficiency, thereby having the effect of energy saving. The cathode is made of titanium, which has the advantages of excellent corrosion resistance and good corrosion resistance, and is not easy to be corroded by dilute sulfuric acid, dilute hydrochloric acid, chlorine solution and most organic acids.
The reaction formula of the aeration reaction performed by the ammonia nitrogen wastewater 300 comprises:
H2CO3+NaClO→HClO+NaHCO3。
the ammonia nitrogen wastewater 300 is aerated by introducing air (shown by dotted line) into the ammonia nitrogen wastewater 300 through the aeration device A, and carbon dioxide (CO) in the air is introduced2) Dissolved in water to generate carbonic acid, and then the carbonic acid reacts with sodium hypochlorite generated in the electrolytic reaction to generate hypochlorous acid and sodium carbonate. The aeration apparatus A may be installed in the pH adjusting unit 100 in this embodiment, in addition to the electrolytic reaction unit 200, to generate carbonic acid in advance in the pH adjusting unit 100, thereby accelerating the reaction rate of sodium hypochlorite and carbonic acid.
The oxidation reaction formula of the ammonia nitrogen wastewater 300 comprises:
NH4 ++HClO→NH2Cl+H++H2o; and
2NH2Cl+HClO→N2+3HCl+H2O。
the hypochlorous acid generated after the ammonia nitrogen wastewater 300 is aerated and the ammonium ions in the ammonia nitrogen wastewater 300 are subjected to oxidation reaction to generate chloramine, and the generated chloramine is continuously subjected to oxidation reaction with the hypochlorous acid until nitrogen is formed, so that nitrogen removal is achieved. During the reaction, hypochlorous acid and ammonia in water need to be continuously reacted, and in this example, the ratio of chlorine: nitrogen is between about 8 and 10: 1. the aeration device a is used to dissolve carbon dioxide into water to generate carbonic acid in the electrolysis reaction unit 200, and can also remove the generated nitrogen out of the water body by aeration.
Wherein the pH value of the ammonia nitrogen wastewater before entering the electrolytic reaction unit is between 6 and 7.5, and the pH value of the ammonia nitrogen wastewater in the electrolytic reaction unit is gradually reduced to between 5 and 6 along with the gradual reduction of the pH value in the electrolytic reaction process. In terms of electrolytic reaction, the pH value of the electrolytic reaction condition of the ammonia nitrogen wastewater 300 is between 4.5 andbetween 6.5, the above pH is maintained because of the generation of toxic gases such as trichloroamine (NCl) at pH values below 43) Trichloromethane (CHCl)3) Above 7.5 again results in poor reaction efficiency.
After nitrogen is generated to achieve the effect of removing ammonia, the residual ammonia nitrogen wastewater flows back to the pH adjusting unit, and because the pH value of the ammonia nitrogen wastewater is gradually reduced in the electrolytic reaction process, the residual ammonia nitrogen wastewater is in a weakly acidic state, and when the residual ammonia nitrogen wastewater flows back and is mixed with the ammonia nitrogen wastewater to be treated in the pH adjusting unit, the pH value of the ammonia nitrogen wastewater to be treated can be adjusted.
The above reactions are in different orders, but the reactions are carried out simultaneously in the electrolytic reaction unit, that is, the electrolytic reaction, the aeration reaction, the oxidation reaction, and the like are carried out simultaneously in the electrolytic reaction unit.
In addition, the ammonia nitrogen wastewater treatment apparatus shown in fig. 1 further includes a reflux water pumping region B adjacent to the electrolytic reaction unit 200, the treated ammonia nitrogen wastewater 300 flows into the reflux water pumping region B in an overflow manner, and a pump returns part of the treated ammonia nitrogen wastewater 300 to the pH adjustment unit 100, so as to achieve the purpose of adjusting the pH value in the pH adjustment unit 100. Although the detailed pump arrangement position is not shown in detail in fig. 1, no matter when the external wastewater enters the pH adjusting unit, the ammonia nitrogen wastewater enters the electrolytic reaction unit from the pH adjusting unit, or the ammonia nitrogen wastewater flows back from the electrolytic reaction unit, it may be necessary to add a pump to introduce the ammonia nitrogen wastewater into each unit, different pump configurations may be provided according to different equipment designs and actual requirements, and the structure shown in the drawing does not limit the scope of the present invention.
In fig. 2, another embodiment of the present invention is provided, which is another layout of the ammonia nitrogen wastewater treatment device according to the present invention, and the pH adjusting unit 100, the electrolysis unit 200 and the corresponding positions of the reflux water pumping area B of the ammonia nitrogen wastewater treatment device 10 according to the different requirements and site designs can be as shown in fig. 2.
Besides, the ammonia nitrogen wastewater treatment device of the utility model can be connected with at least one coagulation unit, at least one precipitation unit, at least one biological treatment unit and/or at least one neutralization unit selectively. In other words, the ammonia nitrogen wastewater treatment device of the utility model can be elastically combined with other different treatment units.
The common breakpoint chlorine adding method for treating ammonia nitrogen waste water is to continuously introduce chlorine gas into waste water until the concentration of ammonia in waste water is reduced to zero. In general, when the breakpoint chlorination method is used, a large amount of chlorine needs to be introduced, and the amount of chlorine introduced must be controlled from time to time so as to avoid the problems of toxic trichloroamine generation or poor efficiency when the pH value exceeds the operating range. However, the utility model provides a processing apparatus of ammonia nitrogen waste water borrows the mode that gets into the electrolysis reaction unit again by the pH value of adjustment ammonia nitrogen waste water, make pH reach appropriate reaction value, and utilize originally in the waste water with the chloridion that exists, and directly produce the required reactant of getting rid of ammonia nitrogen with the mode of electrolysis, do not need extra rethread chlorine, the operating cost is compared and is low in traditional breakpoint chlorination method, additionally the time that lets in chlorine has also been reduced, it is less to handle required time tradition relatively. In addition, in the electrolytic reaction, hypochlorous acid can continuously react with amine compounds in the ammonia nitrogen wastewater until nitrogen is formed and discharged, and the residual ammonia nitrogen wastewater can be recycled without generating wastes or secondary products. In addition, the residual ammonia nitrogen wastewater after electrolysis can be refluxed to be used as the adjustment of the pH value, so that the chemical needed to be added is reduced in the aspect of regulating the pH value. In conclusion, the ammonia nitrogen wastewater treatment device provided by the utility model has the advantages of energy conservation, cost reduction, no waste production and the like.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (5)
1. The utility model provides an ammonia nitrogen wastewater's processing apparatus which characterized in that includes:
a pH adjusting unit for receiving ammonia nitrogen wastewater and adjusting the pH value of the ammonia nitrogen wastewater to be between 6 and 7.5; and
an electrolysis reaction unit, which receives the ammonia nitrogen wastewater from the pH adjusting unit and carries out electrolysis to generate hypochlorite and chloride ions, generates carbonic acid after aeration, and the carbonic acid further reacts with the hypochlorite to generate hypochlorous acid under the condition of weak acidity, and the hypochlorite, the chloride ions and the hypochlorous acid continuously oxidize the ammonia nitrogen wastewater, so that the ammonia nitrogen wastewater is finally oxidized into nitrogen after chloramine is generated and is discharged, and part of the ammonia nitrogen wastewater after the reaction is completed flows back to the pH adjusting unit, and the pH value of the pH adjusting unit is adjusted;
the electrolytic reaction unit is provided with an anode and a cathode, wherein the anode is made of ruthenium or iridium materials, and the cathode is made of stainless steel or titanium materials.
2. The ammonia nitrogen wastewater treatment device of claim 1, wherein the pH adjustment unit further comprises a stirring member.
3. The ammonia nitrogen wastewater treatment device according to claim 1, wherein the anode is a ruthenium iridium titanium anode.
4. The ammonia nitrogen wastewater treatment device of claim 1, wherein the electrolysis reaction unit is further connected with a reflux water pumping area.
5. The ammonia-nitrogen wastewater treatment device of claim 1, which is selectively connected with at least one coagulation unit, at least one precipitation unit, at least one biological treatment unit and/or at least one neutralization unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW107217172U TWM577423U (en) | 2018-12-18 | 2018-12-18 | Device for nitrogen wastewater treatment |
| TW107217172 | 2018-12-18 |
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| CN211664878U true CN211664878U (en) | 2020-10-13 |
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| TW (1) | TWM577423U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956424A (en) * | 2022-05-31 | 2022-08-30 | 中冶赛迪技术研究中心有限公司 | Sintering machine head ash deamination method using desulfurization waste liquid treatment system |
| CN115974341A (en) * | 2023-02-22 | 2023-04-18 | 广东翔鸿生态环境工程有限公司 | High ammonia nitrogen denitrification treatment system and treatment method |
-
2018
- 2018-12-18 TW TW107217172U patent/TWM577423U/en not_active IP Right Cessation
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2019
- 2019-12-18 CN CN201922279871.2U patent/CN211664878U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956424A (en) * | 2022-05-31 | 2022-08-30 | 中冶赛迪技术研究中心有限公司 | Sintering machine head ash deamination method using desulfurization waste liquid treatment system |
| CN115974341A (en) * | 2023-02-22 | 2023-04-18 | 广东翔鸿生态环境工程有限公司 | High ammonia nitrogen denitrification treatment system and treatment method |
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| TWM577423U (en) | 2019-05-01 |
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