CN102351353A - Method for pre-treating inverted trough water of electroplating pre-treatment - Google Patents
Method for pre-treating inverted trough water of electroplating pre-treatment Download PDFInfo
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- CN102351353A CN102351353A CN2011102516374A CN201110251637A CN102351353A CN 102351353 A CN102351353 A CN 102351353A CN 2011102516374 A CN2011102516374 A CN 2011102516374A CN 201110251637 A CN201110251637 A CN 201110251637A CN 102351353 A CN102351353 A CN 102351353A
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Abstract
The invention provides a method for pre-treating inverted trough water of electroplating pre-treatment. The method is characterized by comprising the following steps of: combining acid out and three-dimensional electrolysis technologies; slowly adding concentrated sulfuric acid into the wax-removing inverted trough water, regulating pH to be 2.0, stopping adding, standing, and demixing; taking supernatant; slowly adding the concentrated sulfuric acid into oil-removing inverted trough water, regulating pH to be 2.0, stopping adding, standing, and demixing; taking subnatant; and mixing two clear solutions, and feeding the mixture in a three-dimensional electrolysis device for electrolysis treatment. According to the method, waste oil and waste wax in the inverted trough can be effectively reclaimed, catalytic decomposition of organic matters in the waste water can be improved, and the biochemical performance of the waste water can be improved.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, particularly a kind of pretreatment process of the pre-electroplating treatment water of falling the groove.
Technical background
The pre-treatment of plating piece is an important link in the electroplating technology, mainly is grease and the wax of removing the plating piece surface.Electroplate basic cpds more commonly used in the oil removing process, also use Solvent degreasings such as kerosene, gasoline, acetone, toluene, trieline, tetracol phenixin sometimes, carry out chemical alkaline degreasing again for the part of greasy dirt especially severe.For removing some mineral oil, in degreasing fluid, add a certain amount of emulsifying agent usually, like OP emulsifying agent, AE emulsifying agent, trihydroxy ethylamine oleate soap etc.Therefore Cleaning Wastewater that produces in the oil removing process and renewal waste liquid all are alkaline waste waters, often contain oils and other organic compound, have higher COD, are the major causes that causes that the pre-electroplating treatment waste water COD is too high.These wastewater biodegradabilities are poor, and waste oil often exists with the form of free oil, dispersed oil, oil in water emulsion or dissolving oil, and particularly the droplet diameter of emulsified state adopts conventional method to be difficult to remove below 1 μ m.The method of handling this type waste water at present mainly contains and adopts the method for flocculation, air supporting and Fenton oxidation that waste water is carried out pre-treatment, gets into biochemical system then and handles.Oily water separation technique only is suitable for the heavier electrochemical deoiling of oil slick and separates greasy dirt, and the greasy dirt of emulsified state is removed ability; And Fenton oxidative treatment cost is high, the mud amount is many, be difficult to control.
Summary of the invention
The technical problem that the present invention will solve provides a kind of waste oil, slop wax that can efficient recovery falls in the tank liquor, can improve organic catalyzed degradation in the waste water, can improve the pretreatment process of the pre-electroplating treatment water of falling the groove of the biochemical of waste water.
For solving this technical problem, the technical scheme that the present invention adopts is:
A kind of pre-electroplating treatment water pretreatment of falling groove method is characterized in that acid out and three-dimensional electrolysis technology are made up, and concrete steps are following:
A) in paraffin removal falls tank liquor, slowly add the vitriol oil, regulate pH to 2.0, stop to add, leave standstill layering; Get supernatant liquid;
B) in tank liquor is fallen in oil removing, slowly add the vitriol oil, regulate pH to 2.0, stop to add, leave standstill layering; Take off a layer clear liquid;
C) behind the supernatant liquid among the mixing step A, the subnatant among the B, get into the three-dimensional electrolysis device, carry out electrolysis treatment.
Further, the lower floor's slop wax in the steps A is reclaimed; Upper strata waste oil among the step B is reclaimed;
The three-dimensional electrolysis equipment that said electrolysis treatment adopts is to adopt a slice anode, the form of two negative electrodes, and anode is positioned in the middle of the body of pond, and negative electrode is positioned at body both sides, pond, and anode and negative electrode are all selected the C304 stainless steel for use, and granule electrode is filled between the anode and cathode; Described voltage is 30-60V during electrolysis, and electrolysis time is 20 minutes.Bubbling air in electrolytic process.
Technique scheme is a kind of the method for acid out and three-dimensional electrolysis technology combination processing trade effluent.
Through the mode of acid out, realized that oil removing falls waste oil and paraffin removal in the tank liquor and fall the recovery of the slop wax in the tank liquor,
" three-diemsnional electrode " is called " ternary electrode " again, utilizes this three-diemsnional electrode device to carry out electrochemical treatment, claims " three-dimensional electrolysis technology ".Except two electrodes that traditional electrolyzer has, some granulous working electrode material also between electrode, have been filled, in this device like gac, conductivity ceramics, baton round and glass sphere etc.Under higher operating voltage, these granulated materials also form little electrified body one by one, both " granule electrode "; Compare with traditional tabular and stick electrode, the granule electrode surface-area increases greatly, and the spacing of particle is little, can increase mass transfer velocity, improves current efficiency, therefore can be applied to the pre-treatment of the organic waste water of water treatment field, particularly difficult for biological degradation.
Alkaline degreasing and paraffin removal operation are generally adopted in the pre-treatment of plating piece in the electroplating technology, by means of the saponification and the emulsifying effect of solution, remove the smeary purpose to reach, and therefore the paraffin removal water of falling the groove that forms often also all is alkaline emulsion with the oil removing water of falling the groove.Acid out be meant under acidic conditions or with acid generation chemical reaction after, the solubilised state material becomes the process of colloidal attitude or solid attitude.The acid out technology can realize separating out of grease, xylogen etc., therefore usually is applied to the pre-treatment of papermaking black wash, printing ink wastewater etc.
During electrolysis, adopt the overpotential technology, promptly adopt the above operating voltage of 30V, select 30-60V usually for use; In the electrolyzer, energising back granule electrode forms one by one little charged particle, thereby forms small one by one reaction electrode under the polarized action of highfield, and airborne oxygen reacts at electrode surface, generates H
2O
2Then through a series of reaction; Final hydroxyl radical free radical (OH) the isoreactivity oxygen that forms; These active oxygens have very strong oxidisability; Organism in can attack solution; Break wherein phenyl ring and long carbochain, when realizing the catalytic organism degraded, can improve the biodegradability of waste water greatly.Therefore acid-precipitation method and three-dimensional electrolysis technical tie-up being got up, be applied to pre-electroplating treatment and fall the pre-treatment of tank liquor, can ease off the pressure for subsequent wastewater treatment, give security for final outflow water is up to standard, is a kind of pretreatment process efficiently.The pre-electroplating treatment water pretreatment of falling groove novel process the invention belongs to the waste water treatment process technical field, is specifically related to a kind of the method for acid out technology and three-dimensional electrode electrolysis technology combination processing trade effluent.
Description of drawings:
Accompanying drawing 1: the pretreatment process of the pre-electroplating treatment water of falling the groove
Accompanying drawing 2: electrolyzer structural representation
Embodiment:
The choosing of this embodiment has organic pollution load height, unmanageable plating to fall tank liquor as process object, and acid out-three-dimensional electrolysis technology is carried out pre-treatment to the water of falling the groove, and concrete mistake is called: referring to Fig. 1
(1) process object
Wenzhou, Zhejiang Electroplate Factory's oil removing water of falling the groove and the paraffin removal water of falling the groove, wherein the oil removing water of falling groove COD
Cr=8180mg/L; The paraffin removal water of falling groove COD
Cr=52600mg/L; The pH value is about 10.
(2) processing technological flow
A: acid out process
The paraffin removal water of falling the groove: water sampling adds the vitriol oil while stirring in the red plastic bucket, and regulating the pH value is 2.0, stirs 5min, leaves standstill, and gets supernatant liquid, and lower floor's slop wax is reclaimed by the grease company that professional qualification is arranged.
The oil removing water of falling the groove: water sampling adds the vitriol oil while stirring in the red plastic bucket, and regulating the pH value is 2.0, stirs 5min, leaves standstill, and takes off a layer clear liquid, and upper strata waste oil is reclaimed by the grease company that professional qualification is arranged.
B: three-dimensional electrolysis process
Referring to Fig. 2, three-dimensional electrolysis equipment comprises water outlet plate 4, water distribution board 5, a slice anode 1, two negative electrodes 2, and anode 1 is positioned in the middle of the pond body 6, and negative electrode 2 is positioned at pond body 6 both sides, and anode 1 is all selected the C304 stainless steel for use with negative electrode 2, and granule electrode 3 is filled between the anode and cathode; The mixed clear liquid of two kinds of clear liquids obtaining among the A is injected the three-dimensional electrolysis device, starts oxygen increasing pump, by aeration tube 8 bubbling airs to cloth hydroecium 7.Energized begins to carry out electrolysis, and initial voltage is adjusted to 60V, electrolysis 20 minutes, sampling, Analysis for CO D
CrRemoval effect and wastewater biodegradability changing conditions.Get into the subsequent disposal program after the electrolysis treatment.
(3) test effect
A: acid out experimental result
As shown in table 1: after the paraffin removal water of falling the groove is handled through the acid out process, COD
Cr52600mg/L by original drops to 11600mg/L, and clearance reaches 77.9%; After the oil removing water of falling the groove is handled through the acid out process, COD
Cr8180mg/L by original drops to 3036mg/L, and clearance reaches 62.9%.Obtained removing significantly through organism in acid out processing oil removing water of falling the groove and the paraffin removal water of falling the groove.
B: three-dimensional electrolysis test-results
As shown in table 2: mixed clear water COD
CrThrough electrolysis, drop to 5820mg/L by original 9800mg/L, clearance reaches 40.6%; B/C rises to 0.479 than then by 0.125 before the electrolysis, and visible biochemical is greatly improved, and waste water ph also rises to 6.8 by getting 2.0 before the electrolysis in addition; Exempted the pH regulator step in the subsequent process, water outlet can directly get into biochemical treatment system.
Table 1: acid out experimental result
Table 2: three-dimensional electrolysis experimental result
Claims (4)
1. the pre-electroplating treatment water pretreatment of falling a groove method is characterized in that acid out and three-dimensional electrolysis technology are made up, and concrete steps are following:
A) in the paraffin removal water of falling the groove, slowly add the vitriol oil, regulate pH to 2.0, stop to add, leave standstill layering; Get supernatant liquid;
B) in the oil removing water of falling the groove, slowly add the vitriol oil, regulate pH to 2.0, stop to add, leave standstill layering; Take off a layer clear liquid;
C) behind the supernatant liquid among the mixing step A, the subnatant among the B, get into the three-dimensional electrolysis device, carry out electrolysis treatment.
2. according to the claims 1 described pre-electroplating treatment water pretreatment of falling groove method, it is characterized in that the lower floor's slop wax in the steps A is reclaimed.
3. according to the claims 1 described pre-electroplating treatment water pretreatment of falling groove method, it is characterized in that through the upper strata waste oil among the step B is reclaimed.
4. according to the claims 1 described pre-electroplating treatment water pretreatment of falling groove method; It is characterized in that the three-dimensional electrolysis equipment that said electrolysis treatment adopts is to adopt a slice anode; The form of two negative electrodes; Anode is positioned in the middle of the body of pond; Negative electrode is positioned at body both sides, pond; Anode and negative electrode are all selected the C304 stainless steel for use, and granule electrode is filled between the anode and cathode; Described voltage is 30-60V during electrolysis, and electrolysis time is 20 minutes, bubbling air in electrolytic process.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105384220A (en) * | 2015-12-16 | 2016-03-09 | 无锡吉进环保科技有限公司 | Three-dimensional electrode oxidation reactor |
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| FR2792307B1 (en) * | 1999-04-14 | 2001-06-29 | Julien Lacaze | PROCESS AND DEVICE FOR TREATING INDUSTRIAL EFFLUENTS FOR THE ELIMINATION OF ORGANIC AND / OR MINERAL POLLUTION |
| CN100999347A (en) * | 2006-01-13 | 2007-07-18 | 绵阳市仁智实业发展有限责任公司 | Microelectrolysis treatment method of oil gas field industrial effluent and its device |
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| CN101792221A (en) * | 2010-04-09 | 2010-08-04 | 安徽南风环境工程技术有限公司 | Method for pre-treating N,N-dimethylformamide-containing waste water |
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| 陈武等: "三维电极方法处理石油工业废水COD的实验研究", 《环境科学与技术》, 30 November 2001 (2001-11-30), pages 6 - 9 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105384220A (en) * | 2015-12-16 | 2016-03-09 | 无锡吉进环保科技有限公司 | Three-dimensional electrode oxidation reactor |
| CN105384220B (en) * | 2015-12-16 | 2019-01-22 | 河北天泓环保科技有限公司 | A kind of 3 D stereo anodizing reactor |
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