CN112759040B - Composite electric flocculant and method for treating cold-rolling emulsion wastewater through electric flocculation - Google Patents
Composite electric flocculant and method for treating cold-rolling emulsion wastewater through electric flocculation Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000839 emulsion Substances 0.000 title claims abstract description 25
- 238000005189 flocculation Methods 0.000 title claims abstract description 25
- 230000016615 flocculation Effects 0.000 title claims abstract description 21
- 239000002351 wastewater Substances 0.000 title claims abstract description 11
- 238000005097 cold rolling Methods 0.000 title claims abstract description 10
- 239000002131 composite material Substances 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 30
- 230000010287 polarization Effects 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 8
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 claims description 29
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 229940103272 aluminum potassium sulfate Drugs 0.000 claims description 21
- 229910052700 potassium Inorganic materials 0.000 claims description 15
- 239000011591 potassium Substances 0.000 claims description 15
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 14
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 12
- 239000011780 sodium chloride Substances 0.000 claims description 11
- IGJRYXMMAMQEGY-UHFFFAOYSA-L potassium;iron(2+);sulfate Chemical compound [K+].[Fe+2].[O-]S([O-])(=O)=O IGJRYXMMAMQEGY-UHFFFAOYSA-L 0.000 claims description 9
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 4
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 4
- 235000011151 potassium sulphates Nutrition 0.000 claims description 4
- 239000008394 flocculating agent Substances 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 5
- 238000009297 electrocoagulation Methods 0.000 abstract description 5
- 238000002161 passivation Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 53
- 239000003795 chemical substances by application Substances 0.000 description 23
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 14
- 239000003814 drug Substances 0.000 description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 239000000084 colloidal system Substances 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910000358 iron sulfate Inorganic materials 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000002696 acid base indicator Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 150000001399 aluminium compounds Chemical class 0.000 description 1
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical compound [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- JFBJUMZWZDHTIF-UHFFFAOYSA-N chlorine chlorite Inorganic materials ClOCl=O JFBJUMZWZDHTIF-UHFFFAOYSA-N 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000005649 metathesis reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000007785 strong electrolyte Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
- C02F1/4674—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation with halogen or compound of halogens, e.g. chlorine, bromine
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention relates to a composite electric flocculant, which comprises three components of A, B and C, wherein the component A and the component B are added at the water inlet of an electrolytic tank, and the component C is added in the middle of the water flow of the electrolytic tank. The invention also relates to a method for treating cold rolling emulsion wastewater by electrocoagulation, which is characterized in that based on the volume of electrolytic bath water, the component A is added into the electrolytic bath water according to the proportion of 5-6%, the component B is added into the electrolytic bath water according to the proportion of 2-5 per mill, the total electrolysis time is 5-10 minutes, the component A and the component B are added while water is fed, the amounts of the component A and the component B are calculated according to the addition proportion and the water inlet amount, and the pH value in the electrolytic bath is controlled to be 7-8 through the addition amount of the component C. The invention solves the problems of electrode surface concentration polarization, electrode passivation and the like in the existing electrocoagulation technology, and the addition of the reagent of the invention in the electrocoagulation process can effectively relieve the electrode surface concentration polarization phenomenon, improve the flocculation effect and effectively reduce the loss of electrodes.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to a composite electric flocculant and a method for treating cold rolling emulsion wastewater through electric flocculation.
Background
The electrocoagulation method is a competitive waste water treatment method developed in recent years, and is characterized by that it utilizes iron plate or aluminium plate as anode, and makes it undergo the processes of electrolytic oxidation to produce Fe ion or Al ion, and makes them undergo the processes of a series of hydrolysis and polymerization to obtain polynuclear hydroxyl complex and hydroxide, and uses it as coagulant to make coagulation treatment of suspended matter and organic matter in the water. Meanwhile, water molecules are subjected to electrolytic reaction under the action of current, hydrogen and oxygen are respectively generated at the cathode and the anode, suspended solid particles which are not settled by the flocculating agent in the water are combined with the hydrogen and the oxygen to form an electric floating body with the density smaller than that of the water, and the treatment effect is further improved.
The electric flocculation technology integrates oxidation reduction, flocculation and air floatation, has the characteristics of simple equipment structure, small floor area, low capital investment, convenient operation and management, no secondary pollution, capability of removing various pollutants and the like, can make up for the defects of the traditional treatment method, and has good development prospect and application value.
But the electric flocculation method is used for effectively treating the wastewater, and the problems of electrode passivation, electrolytic polarization and the like are solved, so that the current efficiency and the flocculation effect are ensured, and the tank pressure and the energy consumption are controlled. The electrode passivation is mainly caused by oxidation film formation of metal ions generated by anode dissolution and adhesion to the anode, and the electrolytic polarization comprises concentration polarization, electrochemical polarization and metal anode surface polarization.
Disclosure of Invention
Technical problem to be solved
In view of the defects and shortcomings of the prior art, the invention provides a composite electric flocculant and a method for treating cold-rolling emulsion wastewater by electric flocculation, solves the problems of concentration polarization on the surface of an electrode, electrode passivation and the like in the prior electric flocculation technology, and can effectively relieve the concentration polarization phenomenon on the surface of the electrode, improve the flocculation effect and effectively reduce the loss of the electrode by adding the reagent in the electric flocculation process.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, the embodiment of the invention provides a composite electric flocculant which comprises three components A, B and C,
the component A comprises a sodium chloride solution, the component B comprises an aluminum potassium sulfate solution, the component C comprises a sodium hydroxide solution, the component A and the component B are added at a water inlet of an electrolytic cell, and the component C is added in the middle of a water flow of the electrolytic cell.
Optionally, in the component A, the concentration of sodium chloride is 4-6%; in the component B, the concentration of aluminum potassium sulfate is 20 to 50 percent; in the component C, the concentration of sodium hydroxide is 5 to 20 percent.
Optionally, in the component A, the concentration of sodium chloride is 5%; in the component B, the concentration of aluminum potassium sulfate is 30 percent; in the component C, the concentration of the sodium hydroxide is 10%.
In a second aspect, the embodiment of the invention provides a method for treating cold rolling emulsion wastewater by electrocoagulation, wherein the method comprises the following steps:
carrying out electric flocculation treatment on the cold rolling emulsion wastewater, and adding the composite electric flocculant according to any one of claims 1-3 in the electric flocculation process to relieve the polarization phenomenon of the electrode surface, improve the flocculation effect and effectively reduce the loss of the electrode;
wherein,
on the basis of the volume of water in an electrolytic tank, the component A is added into the water in the electrolytic tank according to the proportion of 5-6%, the component B is added into the water in the electrolytic tank according to the proportion of 2-5 thousandths, the total electrolysis time is 5-10 minutes, the component A and the component B are added while water is fed, the amount of the component A and the amount of the component B are calculated according to the adding proportion and the water inlet amount, and the pH value in the electrolytic tank is controlled to be 7-8 through the adding amount of the component C.
Optionally, the component A is added into water according to the proportion of 6%, and the component B is added into the water of the electrolytic cell according to the proportion of 5 per mill.
Optionally, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the processed emulsion.
Optionally, the component B further comprises a potassium ferric sulfate solution, the concentration of the potassium ferric sulfate solution is 30%, the potassium ferric sulfate solution is added to the water inlet of the electrolytic bath according to the proportion of 2-5 thousandths after the electrolytic reaction of the potassium aluminum sulfate solution is finished and stands for 2-5 minutes, and the electrolytic time of the potassium ferric sulfate solution is 3-5 minutes.
Optionally, the component B further comprises a potassium ferric sulfate solution, the concentration of the potassium ferric sulfate solution is 30%, the potassium ferric sulfate solution and the potassium aluminum sulfate solution are added to a water inlet of the electrolytic cell together according to a proportion of 2-5 thousandths, the potassium ferric sulfate solution is added at the same time of starting water inlet, the amount of the potassium ferric sulfate solution is calculated according to the amount of water inlet according to the adding proportion, and the electrolysis time is 5-10 minutes.
Optionally, the component B further comprises a sodium metaaluminate solution, and the concentration of the sodium metaaluminate solution is 30%. Adding the sodium metaaluminate solution and the aluminum potassium sulfate solution into the water inlet of an electrolytic tank according to the proportion of 2-5 per mill, and electrolyzing for 4-10 minutes.
(III) advantageous effects
The beneficial effects of the invention are: the invention relates to a composite electric flocculant and a method for treating cold-rolling emulsion wastewater by electric flocculation 3+ The generation of aluminum hydroxide colloid is accelerated, and organic matters, colloid and suspended matters in water are destabilized, collided and condensed to form floccule sedimentation by utilizing the adsorption bridging, the compression double electric layers and the net catching effect of the aluminum hydroxide, and then the COD in the water is further reduced.
The two medicaments are matched for use, the COD degradation efficiency can be improved, and Al hydrolyzed by the medicaments is obtained 3+ But also can effectively accelerate the reaction process, shorten the reaction time and reduce the electric quantity and the loss of the electrode plate. The C agent can provide OH for the whole treatment process - Accelerating Al 3+ +3OH - →Al(HO) 3 The forward reaction of (2) and then shorten electrolytic flocculation's treatment cycle, promote the work efficiency of electric flocculation.
Detailed Description
For a better understanding of the above technical solutions, it should be understood that the present invention may be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The main reaction principle is that the reagent is easy to be adsorbed on the surface of electrode with oxide film, so that the oxygen in the film is substituted by said reagent, so that the iron or aluminium compound can be dissolved in the zone where said reagent is adsorbed, and the water-passivated film of these zones can be formed into pores, and the aluminium ion or ferrous ion can be introduced into electrolyte.
The properties of the medicament: the product is divided into two solid preparations A, B and C;
the A medicament is sodium chloride:
physical properties:
appearance and properties: colorless crystals or white powder
Density: 1.199 g/mL at 20 deg.C
Water solubility: 360 g/L (20 ℃ C.)
Stability: stable under normal transport and handling conditions
Storage conditions were as follows: low temp. in storehouse, ventilation, drying and steaming
Steam pressure: 1 mm Hg (865 deg.C)
Melting point: 801 deg.C (about 1074K)
Boiling point: 1465 deg.C (about 1738K)
Chemical properties of sodium chloride:
is slightly soluble in ethanol, propanol and butane, becomes plasma after being mutually soluble with butane, and is easily soluble in water.
NaCl, dispersed in alcohol, forms a colloid, the solubility of which in water is reduced by the presence of hydrogen chloride, and which is almost insoluble in concentrated hydrochloric acid.
The B medicament is aluminum potassium sulfate:
physical properties: is a double salt of potassium sulfate and aluminum sulfate containing crystal water. KAI (SO 4) 2.12H 2O, colorless cubic, monoclinic or hexagonal crystal, glass luster, density of 1.757g/cm3 and melting point of 92.5 ℃.
The chemical properties are as follows: 9 molecular crystal water is lost at 64.5 ℃, 12 molecular crystal water is lost at 200 ℃, and the crystal water is soluble in water and insoluble in ethanol.
The agent C is sodium hydroxide:
physical properties: sodium hydroxide is a white opaque waxy solid with a density of 2.13. It has a molecular weight of 40.00, a melting point of 318 deg.C (591K), and a boiling point of 1388 deg.C (1661K). Can be dissolved in water to form alkaline solution, and can also be dissolved in methanol and ethanol, wherein the solubility in water is 111 g/100 ml (20 ℃), the solubility in methanol is 238 g/L, and the solubility in ethanol is less than 139 g/L.
The chemical properties are as follows: reacting with an acid-base indicator; reacting with a non-metal oxide; carrying out neutralization reaction with acid; metathesis reactions with certain salts occur.
The preparation scheme of the medicament is as follows: A. b and C medicaments are prepared respectively, the A medicament is prepared into a medicament solution according to the concentration of 5%, the B medicament is prepared into a solution according to the concentration of 30%, the prepared solutions of the two medicaments are added at the water inlet of the electrolytic cell, and the C medicament is prepared according to the concentration of 10% and is added in the middle of the water flow of the electrolytic cell;
comparative example 1: the cold-rolled emulsion is processed by a traditional simple electrolytic method, the effluent meets the requirements of subsequent biochemical processing procedures and the like, the electrolysis time is required to be 40-50 minutes, the power consumption is large, the electrolytic scum volume is fluffy, the scum volume accounts for 1/2-2/3 of the total volume of the processed emulsion, and the COD removal rate is 70-80%;
example 1: the solution of the agent A is added into water according to the proportion of 6 percent, the solution of aluminum potassium sulfate is added into water according to the proportion of 3 per mill, the agent C is added according to the change of the pH value in the water with proper amount, and the pH value is controlled to be 7 to 8; the effluent meets the requirements of subsequent biochemical treatment procedures and the like, the electrolysis time can be shortened to 8 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 92 percent.
Example 2: the solution of the agent A is added into water according to the proportion of 5 percent, the solution of aluminum potassium sulfate is added into water according to the proportion of 2 thousandths, the agent C is added according to the change of the pH value in the water with proper amount, and the pH value is controlled to be 7 to 8; the effluent meets the requirements of subsequent biochemical treatment procedures and the like, the electrolysis time can be shortened to 10 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 88 percent;
example 3: the solution of the agent A is added into water according to the proportion of 6 percent, the solution of aluminum potassium sulfate is added into water according to the proportion of 5 per thousand, the agent C is added according to the change of the pH value in water, and the pH value is controlled to be 7 to 8; the effluent meets the requirements of subsequent biochemical treatment procedures and the like, the electrolysis time can be shortened to 5 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 96 percent.
Example 4: the solution of the agent A is added into water according to the proportion of 6 percent, the solution of iron sulfate and potassium sulfate is added into water according to the proportion of 3 per mill, the agent C is added according to the change of the pH value in the water with proper amount, and the pH value is controlled to be 7 to 8; the effluent meets the requirements of subsequent biochemical treatment procedures and the like, the electrolysis time can be shortened to 9 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 85 percent.
Example 5: the solution of the agent A is added into water according to the proportion of 6% +3%, the solution of aluminum potassium sulfate is added into water according to the proportion of 3 per mill, the solution of iron potassium sulfate is added into water according to the proportion of 3 per mill, the solution of the agent C is added according to the change of the pH value in water, and the pH value is controlled to be 7 to 8; the effluent meets the requirements of subsequent biochemical treatment procedures and the like, the electrolysis time can be shortened to 7 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 94 percent.
After the aluminum potassium sulfate is added in the example 1, 3 per thousand percent of iron potassium sulfate is added, and the chemical solution is added by 3 percent more, the COD removal rate reaches 95 percent, which is 3 percent more than 92 percent in the example 1, that is, the iron potassium sulfate can remove the part which can not be removed by the aluminum potassium sulfate.
Example 6: the solution of the agent A is added into water according to the proportion of 6 percent, the solution of aluminum potassium sulfate is added into water according to the proportion of 3 per mill, the agent C is added according to the change of the pH value in the water with proper amount, and the pH value is controlled to be 7 to 8; the effluent meets the requirements of subsequent biochemical treatment procedures and the like, the electrolysis time can be shortened to 8 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 92 percent;
standing the solution of the electrolytic cell for 3 minutes, adding the solution of the agent A into water according to the proportion of 3 percent, adding the solution of iron sulfate and potassium into water according to the proportion of 3 per mill, and adding the agent C according to the change of the pH in the water, wherein the pH is controlled to be 7 to 8; the effluent meets the requirements of subsequent biochemical treatment procedures and the like, the electrolysis time is 3 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 98 percent.
On the basis of adding the potassium aluminum sulfate in the embodiment 1, after standing for 3 minutes, the potassium iron sulfate is added, the COD removal rate is as high as 98 percent, 6 percent points are more than 92 percent in the embodiment 1, 3 percent points are more than 95 percent in the embodiment 5, the components added in the embodiment 5 and the embodiment 6 have the same amount, the difference is that the process is different, probably because the potassium aluminum sulfate is removed most of the time, the reaction of the potassium iron sulfate is facilitated, and possibly, certain ions after the reaction promote the subsequent reaction of the potassium iron sulfate.
Example 7: the solution of the agent A is added into water according to the proportion of 6 percent, the solution of iron sulfate and potassium sulfate is added into water according to the proportion of 3 per mill, the agent C is added according to the change of the pH value in the water with proper amount, and the pH value is controlled to be 7 to 8; the effluent meets the requirements of subsequent biochemical treatment procedures and the like, the electrolysis time can be shortened to 9 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 85 percent.
Standing the solution of the electrolytic cell for 3 minutes, adding the solution of the agent A into water according to the proportion of 3 percent, adding the solution of aluminum potassium sulfate into water according to the proportion of 3 per mill, and adding the agent C according to the change of the pH in the water, wherein the pH is controlled to be 7 to 8; the effluent meets the requirements of subsequent biochemical treatment procedures and the like, the electrolysis time is 3 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 97 percent.
On the basis of the added potassium ferric sulfate, after standing for 3 minutes, the potassium aluminum sulfate is added, the COD removal rate is up to 97%, 5% more than 92% in example 1, 2% more than 95% in example 5, but one% lower than 98% in example 6, and the difference between example 6 and example 5 lies in the addition sequence of potassium ferric sulfate and potassium aluminum sulfate, and it can be seen that the COD removal rate can be improved by adding potassium ferric sulfate and potassium aluminum sulfate sequentially, but the COD removal rate can be improved by adding potassium aluminum sulfate first and adding potassium ferric sulfate later.
Example 8: the solution of the agent A is added into water according to the proportion of 6 percent, the solution of aluminum potassium sulfate and sodium metaaluminate are added into water according to the proportion of 3 per mill, the agent C is added according to the change of pH in water with proper dosage, and the pH is controlled to be 7 to 8; the effluent meets the requirements of subsequent biochemical treatment processes and the like, the electrolysis time can be shortened to 6 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 94%. The COD removal rate of example 8 was 94% which was two percentage points greater than 92% in example 1, and the electrolysis time was shortened to 6 minutes.
The reaction principle of A, B and C in the invention is as follows: wherein, sodium chloride and aluminum potassium sulfate belong to strong electrolyte, sodium chloride is added into water to hydrolyze Cl & lt- & gt and Na & lt + & gt, and aluminum potassium sulfate is added into water to hydrolyze K + 、Al 3+ And SO 2 -4 The electrode plate is an aluminum plate, and the reaction generated in the electric flocculation process is as follows:
anode: al → Al 3+ +3e
Cl — +2OH - →ClO - +H 2 O+2e
2Cl—→Cl 2 +2e
Cathode: 2H 2 O+2e→H 2 +2OH -
Al 3+ +3OH - →Al(HO) 3
Chlorine and hypochlorite generated by the reaction of chloride ions hydrolyzed by sodium chloride are strong oxidizers, organic matters in water can be oxidized into organic matters and inorganic matters with smaller molecular weight, and Al hydrolyzed by aluminum sulfate 3+ Accelerating the generation of aluminum hydroxide colloid, utilizing the adsorption bridging, double electric layer compression and net catching functions of the aluminum hydroxide to ensure that organic matters, colloid and suspended matters in water are unstable, mutually collide and agglomerate to form flocculating constituent settlement, and further reducing COD in the water.
The two medicaments are matched for use, the COD degradation efficiency can be improved, and Al hydrolyzed by the medicaments is obtained 3+ But also can effectively accelerate the reaction process, shorten the reaction time and reduce the electric quantity and the loss of the electrode plate. The C agent can provide OH for the whole treatment process - Accelerating Al 3+ +3OH - →Al(HO) 3 The forward reaction of (2) and then shorten electrolytic flocculation's treatment cycle, promote the work efficiency of electric flocculation.
The iron potassium sulfate reaction principle of the invention refers to aluminum potassium sulfate, and it should be noted that if the iron potassium sulfate solution is adopted alone, the electrode plate is an iron electrode, if the aluminum potassium sulfate solution is adopted alone, the electrode plate is an aluminum electrode, and if both solutions are adopted and added simultaneously, the electrode plate adopts an iron electrode and an aluminum electrode.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (1)
1. A method for treating cold rolling emulsion wastewater by electric flocculation is characterized by comprising the following steps: the method comprises the following steps:
carrying out electric flocculation treatment on cold-rolling emulsion wastewater, and adding a composite electric flocculating agent in the electric flocculation process to relieve the polarization phenomenon of the surface of the electrode, improve the flocculation effect and effectively reduce the loss of the electrode;
wherein,
the composite electric flocculant comprises three components A, B and C, wherein the component A comprises a sodium chloride solution, the component B comprises an aluminum potassium sulfate solution and an iron potassium sulfate solution, and the component C comprises a sodium hydroxide solution;
the component A and the component B are added at the water inlet of an electrolytic cell, and the component C is added in the middle of the water flow of the electrolytic cell;
in the component A, the concentration of sodium chloride is 4 to 6 percent; in the component B, the concentration of aluminum potassium sulfate is 20 to 50 percent, and the concentration of the ferric potassium sulfate solution is 30 percent; in the component C, the concentration of sodium hydroxide is 5 to 20 percent;
the component A is added into water according to the proportion of 6 percent, the aluminum potassium sulfate solution is added into the water according to the proportion of 3 per thousand, the component C is added according to the change of the pH value of the water, and the pH value is controlled to be 7 to 8; the effluent meets the requirements of the subsequent biochemical treatment process, the electrolysis time is 8 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 92 percent;
standing the solution in the electrolytic cell for 3 minutes, adding the component A into water according to the proportion of 3%, adding a ferric sulfate potassium solution into water according to the proportion of 3 per mill, adding the component C according to the change of the pH value in the water, and controlling the pH value to be 7-8; the effluent meets the requirements of subsequent biochemical treatment procedures, the electrolysis time is 3 minutes, the volume of scum generated by electrolysis accounts for 1/4 to 1/5 of the total volume of the treated emulsion, and the COD removal rate is 98 percent.
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