CN1931736A - Degrading and viscosity reducing process for sewage containing oil and polymer - Google Patents
Degrading and viscosity reducing process for sewage containing oil and polymer Download PDFInfo
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Abstract
The present invention relates to oil field effluent treating technology, and is especially degrading and viscosity reducing process for sewage containing oil and polymer. The oil field effluent treating process includes the following steps: 1. introducing the polymer containing effluent into reactor with anode, cathode and stirrer; and 2. treating the effluent for 20-50 min through slow stirring at normal temperature, the action of the acidic medium inside the reactor and the action of the anode and cathode. The present invention has the advantages of simple technological process, simple reactor structure, high treating effect, small sludge amount, low power consumption, no secondary pollution and capacity of treating different kinds of oil field water.
Description
Technical field
The present invention relates to a kind of process for treating oil field sewage, be specifically related to a kind of treatment process that is used for the sewage viscosity reduction degraded of oil-containing and polymkeric substance.
Background technology
Polymer flooding is a kind of tertiary oil recovery new technology, has stepped into the industrial applications stage at Daqing oil field.The polymer flooding annual production reaches 9,000,000 t, follows the above polymer-containing wastewater of annual 6000 ten thousand t of generation of crude oil, can't re-injection after the sewage that contains polymkeric substance is in a large number handled with prior art, can only efflux, cause environmental pollution, therefore, sewage disposal with utilize again extremely important.
Partially hydrolyzed polyacrylamide (abbreviating HPAM as) is one of two kinds of the most frequently used polymer flooding hosts of present oil field, and it improves the recovery ratio of crude oil by the sweep efficiency that improves water.But because the existence of this polymkeric substance makes that the composition of oil field extracted water is more complicated, the performance variation, intractability obviously increases.And this water-soluble HPAM fails in the process because of being subjected to complicated ingredient and condition influence in the environment at the collection of stratum migration and recovered water, the macromolecular chain fracture is serious, the sewage viscosity number descends, substantially lost displacement of reservoir oil function, the direct reinjection into reservoir of polymer-containing wastewater of this moment or be used for prepared polymer and all can not reach corresponding water quality requirement.But because its existence, cause the viscosity of recovered water big, salinity increases, COD value height, oil in water emulsion and dissolving oil content height, the bacteria living ability is strong and vulnerability to jamming is strong, is difficult to reach the requirement of re-injection water or discharging in the recovered water.Therefore, research contains the degrading and viscosity reducing process of polyacrylamide oil field sewage, has very urgent meaning for gathering the oilfield produced waste water processing of driving with the ternary composite driving oil reservoir, is the key that solves this class sewage disposal.
At present, petroleum industry has mainly adopted methods such as filtering technique, air supporting method, membrane separation technique, ultrafiltration, use water purification agent, ultrasonic technology or use potassium ferrate for the degraded of polymkeric substance in the recovered water that contains polymkeric substance.But they exist following deficiency to the processing of oil-containing and polymer sewage:
Filtering technique is low to the clearance of polymkeric substance, only is 30-40%, and can produce a certain amount of mud and need secondary treatment.
The air supporting method does not have obvious effect to the removal of high polymer.
Membrane separation technique is the focus of studying at present, because its processing accuracy height, but cost an arm and a leg, therefore, it is mainly used in the produced water disposal in viscous crude field and low permeability oil field.
Ultrafiltration is owing to ultra-filtration membrane heat resistance poor (being generally 65～90 ℃), and work-ing life is short, easily stops up, and costs an arm and a leg, and has hindered the widespread use of this technology in oil field produced water treatment.
Use water purification agent along with the increase reagent consumption amount of water treatment amount increases, processing costs is higher.
Ultrasonic technology has a large amount of breadboard fundamental research achievements abroad as a kind of new wastewater processing technology, and has part to enter practical application, is considered to a kind of promising wastewater processing technology.Ultrasonic wave to organic degraded based on cavitation theory and two theories of free radical.Clearance to polymkeric substance in the sewage can reach 50～65%.
With potassium ferrate to the oil field contain polyacrylamide sewage water degrade and its clearance of viscosity reduction to polymkeric substance lower, generally can reach 60-70%.
Be in the patent application of CN1320562A at publication number in addition, propose " a kind of process for treating oil field sewage " that its deficiency is: additive types is many, dosage is big (A, B, C dosage amount to 0-715mg/L);
And publication number is the patent application of CN1724397A, introduced " treater of sewage by electrochemistr catalyzing oxidizing ", it is characterized in that belonging to three-dimensional electrochemical reactor, wherein need to fill gold mine stone flour, silver ore stone flour and manganese ore stone flour grade in an imperial examination three electric polarity materials, the price comparison costliness of third electrode.
Also having publication number is the patent application of CN2756626Y, and disclosed is " a kind of oil field sewage treating equipment ", and its reactor composition part is many and complicated, current consumption is higher.
Comprehensively above-mentioned, present to following some deficiency of oil field produced sewage disposal existence: operation steps is many, a certain amount of mud of meeting generation need secondary treatment; Consumable material is many, need carry out forming processes to filler; Reactor composition part is many and complicated, current consumption is higher; Clearance to polymkeric substance is low.
Summary of the invention
The objective of the invention is that the existing method for treating water cut out that contains polymkeric substance to the oil field has secondary pollution, reactor complexity, complex process, sludge quantity is big and the current consumption problem of higher in order to solve; The degrading and viscosity reducing process of a kind of oil-containing and polymer sewage is provided.The present invention is as follows to the step of disposing polluted water in oil: the oil extraction-generated waste water that, will contain polymkeric substance feeds and is equipped with in the reactor of anode, negative electrode and agitator, two, agitator with in stir at a slow speed, under the condition of normal temperature, in the acidic medium of reactor, under the effect of anode and negative electrode, handle 20min～50min; Degraded be can realize, re-injection water and discharging requirements in water quality behind the process quartz sand filtration, can be reached viscosity reduction and the organic pollutant and the oil in water emulsion of sewage.
The present invention can make starting point concentration in the sewage be 500-1000mg/L, initial viscosity (apparent) for 8.00mPaS contain the degraded of aqueous solutions of polymers viscosity reduction, (standard temperature is 30 ℃) tap water viscosity is near (0.82～0.91mPaS) under viscosity reduction rear solution viscosity and the same test temperature.Oil-contg, COD, HPAM content, amount of bacteria etc. all reach and efflux water quality requirement in the sewage of process sedimentation filtration back, can directly discharge.
Electrochemical degradation has comprised three kinds of principal reactions: in this electrochemical reaction system, pollutants in waste water is purified under electrochemistry indirect oxidation, electricity flocculation, electric floating three kinds of effects.Reaction principle is as follows:
(1) comprises electric flocculation process.Polymer-bearing waste-water a certain amount of floss occurred in the solution in electrochemical treatment process.This is the process that an electricity generates flocculation agent, specifically reacts as follows:
Anode:
Negative electrode:
Total reaction:
The flco feature that electricity generates flocculation agent is obviously different with chemical flocculation, have the flco water content little, more stable, be easier to filtering advantage.
Follow electric floating process simultaneously.Negative electrode constantly has small bubbles to generate, i.e. the hydrogen that water electrolysis reduction generates, and can making partly by pneumatically supported rolling action, lighter organic pollutant be floated and is removed.
(2) also comprise electro-oxidation process.The feature of this technology is to utilize when also not having flco to generate in the weak acid environment of pH=3.5～5.5, particularly solution, and COD and viscosity number are reduced significantly.Utilize the strong oxidation activity inter-level that moment forms in the solution to strengthen organism in the water of decomposition, reduce soltion viscosity, specifically react as follows:
Anode:
Negative electrode:
React in the solution:
Promptly generate Fenton (Fenton) reagent, thereby realize electrochemical catalytic oxidation indirectly by the electrochemical reaction electricity.Be hydroxyl radical free radical (OH) the i.e. electricity generation Fenton reagent that generates with the reaction of hydrogen peroxide and ferrous ion, and the hydroxyl radical free radical extremely strong intermediate strong oxidizer that is oxidation capacity.This characteristic feature of an invention is to utilize the less condition of initial pH to create to help the processing condition that electro-Fenton reaction takes place, and significantly improves DeR efficient.
Reaction unit of the present invention is made up of reactor, anode, negative electrode, thief hole, agitator, venting hole, direct supply, voltmeter and reometer.Anode, negative electrode and agitator are in reactor; Thief hole is communicated with the outer lower portion of reactor; Venting hole is communicated with the upper end of reactor; The positive pole of direct supply, voltmeter and reometer links to each other with anode, and the negative pole of direct supply, voltmeter and reometer is connected with negative electrode, and direct supply, voltmeter and reometer parallel connection.
The present invention has that technology is simple, structure of reactor is simple, treatment effect is good, sludge quantity is little, save electricity, non-secondary pollution and can handle the advantage of the oil field extracted water that high salinity, differing temps and COD value are high, viscosity is high, bacteria content is high.
Description of drawings
Fig. 1 is reaction unit figure, Fig. 2 is the different polymers soln degradation effect figure of molecular weight, among Fig. 2-■-represent molecular weight is 8,000,000 polymers soln degradation effect curve, among Fig. 2-●-to represent molecular weight be 1,680 ten thousand polymers soln degradation effect curve, among Fig. 2-▲-to represent molecular weight be 1,680 ten thousand polymers soln degradation effect curve, Fig. 3 is the influence figure of concentration of polyacrylamide to the COD clearance, among Fig. 3-■-represent concentration of polyacrylamide is the curve of 750mol/L to the COD clearance, among Fig. 3-●-to represent concentration of polyacrylamide be the curve of 630mol/L to the COD clearance, among Fig. 3-▲-to represent concentration of polyacrylamide be the curve of 500mol/L to the COD clearance, Fig. 4 is the influence figure of concentration of polyacrylamide to oil removal rate, among Fig. 4-■-represent concentration of polyacrylamide is the curve of 750mol/L to oil removal rate, among Fig. 4-●-to represent concentration of polyacrylamide be the curve of 630mol/L to oil removal rate, among Fig. 4-▲-to represent concentration of polyacrylamide be the curve of 500mol/L to oil removal rate, Fig. 5 is that three kinds of bacterial concentrations are with the electrolysis time variation diagram, among Fig. 5-curve that ■-represent SKB bacterial concentration changes with electrolysis time, among Fig. 5-●-curve of representing the FB bacterial concentration to change with electrolysis time, among Fig. 5-▲-represent the curve of TGB concentration with the electrolysis time variation.
Embodiment
Embodiment one: the present invention is as follows to the step of disposing polluted water in oil: the sewage that one, will contain polymkeric substance feeds and is equipped with in the reactor 1 of anode 2, negative electrode 3 and agitator 5, two, agitator 5 with in stir at a slow speed, at bath voltage, the 75～80mA/cm of the acidic medium under the condition of normal temperature, in reactor 1,10～30V
2Current density, under the effect of anode 2 and negative electrode 3, handle 20min～50min.Degraded be can realize, re-injection water and discharging requirements in water quality behind the process quartz sand filtration, can be reached viscosity reduction and the organic pollutant and the oil in water emulsion of sewage.
Embodiment two: the acidic medium of present embodiment in step 2 is HCl, its pH=1～6, and other is identical with embodiment one.
Embodiment three: present embodiment has increased additive in step 2, and additive is NaCl or CaCl
2, other is identical with embodiment one.
Additive contains a large amount of Cl
-, on anode 2, Cl is arranged
2Separate out, and Cl
2Favourable to organic degraded, have germicidal action simultaneously.
Embodiment four: present embodiment has increased cocatalyst in step 2, and cocatalyst is for containing Ce
4+And La
3+The ionic lucium, other is identical with embodiment one.
Add cocatalyst the viscosity of the recovered water that contains polymkeric substance in oil field is reduced, and reach the synthermal viscosity of tap water down, make the clearance of COD increase more than 95% simultaneously.
Embodiment five: the material of the anode 2 of present embodiment is iron, aluminium, stainless steel, carbon steel or titanium, is shaped as tabularly, and thickness is 0.5～3mm, and other is identical with embodiment one.
Embodiment six: the material of the negative electrode 3 of present embodiment is stainless steel or carbon steel, is shaped as tabularly, and thickness is 0.5～3mm, and other is identical with embodiment one.
Embodiment seven: the anode 2 and the distance between the negative electrode 3 of present embodiment are 1～10cm, and adopt many group parallel arrangements,
Embodiment eight: the agitator 5 of present embodiment is magnetic stirring apparatus, mechanical stirrer or ultrasonic agitation device, and other is identical with embodiment one.
Embodiment nine: the reactor 1 of present embodiment is two-dimentional reactor, and other is identical with embodiment one.
Present embodiment need not added the third electrode material, has saved materials consumption.Reactor structure is simple, and technical process is simple, adds a procedure and get final product on the common process basis.
Embodiment ten: present embodiment to the oil field contain the produced water disposal of polymkeric substance the time parameter be: anode 2 is used stainless steel, negative electrode 3 usefulness 20
#Steel, bath voltage are 20V, and current density is 75-80mA/cm
2, the distance between anode 2 and the negative electrode 3 is 2cm, the polymer concentration that contains of preparation is 1000mg/L, wherein the oil field is with the molecular-weight average 1,680 ten thousand of polyacrylamide, magnetic stirring apparatus with in stir the pH=4 of acidic medium～6 at a slow speed, handle 20min, the results are shown in Table 1.
Table 1
| Reaction times, min | Viscosity, mPa.s | COD，mg/ |
| 0 | 7.941 | 1326 |
| 20 | 0.9337 | 174 |
Embodiment 11:
Present embodiment to the oil field contain the produced water disposal of polymkeric substance the time parameter be: anode 2, negative electrode 3 are all used stainless steel, and bath voltage is 20V, and current density is 60-70mA/cm
2, the distance between anode 2 and the negative electrode 3 is 2cm, the polymer concentration that contains of preparation is 1000mg/L, wherein the oil field is with the molecular-weight average 1,680 ten thousand of polyacrylamide, magnetic stirring apparatus with in stir the pH=3 of acidic medium～4 at a slow speed, handle 15min, the results are shown in Table 2.
Table 2
| Reaction times, min | Viscosity, mPa.s | COD，mg/ |
| 0 | 7.235 | 1078 |
| 15 | 0.8962 | 87.4 |
Embodiment 12: present embodiment to the oil field contain the produced water disposal of polymkeric substance the time parameter be: anode 2 is used aluminium sheet, and negative electrode 3 is used stainless steel, and bath voltage is 20V, and current density is 20-30mA/cm
2, the distance between anode 2 and the negative electrode 3 is 2cm, the polymer concentration that contains of preparation is 500mg/L, wherein the oil field is with the molecular-weight average 1,680 ten thousand of polyacrylamide, magnetic stirring apparatus with in stir at a slow speed, 15min is handled in the pH=3 of acidic medium～4, the results are shown in Table 3.
Table 3
| Reaction times, min | Viscosity, mPa.s | COD，mg/ |
| 0 | 3.835 | 829 |
| 15 | 0.9126 | 62 |
The viscosity and the COD of the recovered water that contains polymkeric substance in the oil field after being handled by the visible the present invention of embodiment ten, 11,12 obviously reduce.
Embodiment 13: present embodiment to the oil field contain the produced water disposal of polymkeric substance the time parameter be: anode 2 and negative electrode 3 all adopt stainless steel plate, distance between anode 2 and the negative electrode 3 is 2cm, the pH=5 of acidic medium, polymericular weight 8,800,000, concentration 500mg/L, sewage quantity 2L, magnetic stirring apparatus with in stir at a slow speed and react.
Make θ=[(η
0-η
i)/(η
0-η
Water)] * 100% be defined as the clearance of polymkeric substance.
θ-polymkeric substance clearance, %;
η
0-solution initial viscosity value, mPa.s;
η
i-reaction back soltion viscosity value, mPa.s;
η
WaterViscosity number during 30 ℃ in-tap water, mPa.s;
Table 4
| t/ | 0 | 10 | 20 | 30 | 40 | 50 |
| η/mPa.s | 2.179 | 1.081 | 0.9158 | 0.8578 | 0.8477 | 0.8214 |
| θ/％ | 80.32 | 92.41 | 96.65 | 97.39 | 99.31 |
The result is when handling 20min, and near the viscosity number of water, when handling 30min, the sewage viscosity number is consistent with the value of water for soltion viscosity.
Under same reaction conditions, for the different aqueous solutions of polymers of molecular-weight average, starting point concentration is identical, result such as Fig. 1.Soltion viscosity all reaches the viscosity number of water after the electrocatalytic reaction time reaches 20min.Also proof HPAM this moment is thoroughly degraded.
Embodiment 14: present embodiment to the oil field contain the produced water disposal of polymkeric substance the time parameter be: with concentration is that ultra-high molecular weight (2,580 ten thousand) polyacrylamide solution of 1000mg/L transfers to 750mg/L, 630mg/L, 500mg/L respectively with the polymer concentration in the oilfield sewage, the pH value of solution is transferred to 3～5, anode and negative electrode 3 all adopt iron plate, distance between anode 2 and the negative electrode 3 is 2.0cm, is 75.0mA/cm in current density
2Carry out electrolysis under the condition.The result is shown in Fig. 2, Fig. 3 and table 5.
Table 5
| The solution original concentration, mg/L | 500 | 630 | 750 |
| Soltion viscosity before handling, soltion viscosity behind the mPa.s processing 20min, mPa.s | 2.7694 0.8373 | 3.3401 0.8393 | 5.2825 0.8191 |
The result proves polymer concentration when 500mg/L, and the clearance of oil and CODcr reaches more than 90%, and the sewage viscosity number is consistent with the viscosity number of water, and organism all is degraded.
Embodiment 15: present embodiment to the oil field contain the produced water disposal of polymkeric substance the time parameter be: with the polymkeric substance waste water of oil field extracted water preparation, its viscosities il
0=6.822mPa.s (COD
Cr=1206mg/L).The pH=2 of acidic medium～5 are in various ce
4+(C
0=0.1mol/L) the following reaction of ion dosage 20min's the results are shown in Table 6.
Table 6
| C(Ce 4+)(mmol/L) | 0.25 | 0.5 | 0.75 | 1.0 | 1.25 |
| η 1(mPa.s) η 2(mPa.s) COD cr(mg.L) COD crClearance (%) | 2.781 0.9528 837.4 30.6 | 0.9955 0.8803 22.8 98.1 | 0.8782 0.8875 28.2 97.7 | 0.8971 0.8813 27.8 97.7 | 0.9147 0.9004 60.3 95.0 |
η
1Soltion viscosity value during for reaction 10min has made the viscosity of solution be reduced to 0.8782mPa.s when the add-on of cerium ion is 0.75mmol/L, and from viscosity number η
2As can be seen, the effect of each add-on reaches unanimity during reaction 20min, has all reached the synthermal viscosity of tap water down, and the clearance of COD is all greater than 95% after dosage is greater than 0.5mmol/L at this moment, and degradation effect is very good.
Embodiment 16: present embodiment to the oil field contain the produced water disposal of polymkeric substance the time parameter be: the pH=2 of acidic medium～5, prepared full-bodied polymers soln (C with oil field extracted water
0=1500mg/L, viscosities il
0=7.941mp.s), the dosage of catalyzer lanthanum ion just makes viscosity be reduced to below the 0.9mPa.s more than the 0.5mmol/L, and the treatment time is 10min, works as La
3+Dosage is during greater than 0.5mmol/L, COD
CrValue all is lower than 130mg/L, has reached the sewage second-level emission standard, and COD reaches the sewage first discharge standard this moment less than 100mg/L when adding 1.25mmol/L.
Reaction below recovered water carried out after removing oil slick, anode adopts stainless steel plate, cloudyly adopts 20
#Steel plate, reaction the results are shown in Table 7 behind the 20min.Add the back COD of sewage
CrValue reaches emission standard after handling.Oil-contg all reaches the requirement of re-injection water, illustrates the degradation effect of oil in water emulsion obvious.
Table 7
| Character | Do not have and add | x(Ce 4+) | y(La 3+) |
| C(mmol/L) η(mPa.s) COD cr(mg/L) Ф Oil-contg(mg/L) | 0 0.9713 130.4 36.2 | 0.5 0.8834 46.3 15.3 | 1.0 0.8846 45.6 16.2 |
Embodiment 17: present embodiment to the oil field contain the produced water disposal of polymkeric substance the time parameter be: owing to contain various interpolation auxiliary agents, oil-displacing agent and oil organic substances such as (oil slick and oil in water emulsions), also contain Cl in the oil field extracted water
-, HCO
3 -, CO
3 2-Etc. multiple zwitterion, so composition is very complicated.
Present embodiment is before electrochemical treatment recovered water have been carried out coarse filtration, carries out electrochemical treatment after having removed oil slick, anode 2 usefulness titanium base titanium ruthenium stannum oxide coating electrodes, negative electrode 3 titanium plate, and several important indicators of sewage change and see Table 8.
Table 8
| t/min | Salinity (mg/L) | Colourity | Turbidity | COD cr(mg/L) | HPAM(mg/L) |
| 0 30 45 60 | 2820 1425 1690 1295 | 60 15 8 9 | 900 500 300 200 | 717.9 83.4 70.8 71.6 | 406.4 8.92 52.3 17.3 |
Leading indicator all reaches first discharge standard as a result.Salinity also has obvious reduction, proves that this electrochemical reaction process has the chlorine of analysing, liberation of hydrogen, analyses gases such as oxygen and emit reaction, and organic pollutant has reached thorough mineralising.
Embodiment 18: present embodiment to the oil field contain the produced water disposal of polymkeric substance the time parameter be: with titanium base ruthenium dioxide is anode 2, with stainless steel as negative electrode 3, distance between anode 2 and the negative electrode 3 is 2.0cm, and impressed voltage is 2.4V, and current density is 1.33mA/cm
2, what electrolyzer adopted is the large beaker of 500L.In the experimentation, by adjusting bath voltage, holding current is constant.Three kinds of predominantly bacteria result of variations such as Fig. 4.
The result just can make three kinds of inactivation of bacteria quickly under very low current density, reach germ-resistant purpose.That sterilization speed is the fastest is saprophytic microorganism (TGB), and sterilizing rate is 99.4% when handling 20min, and sterilizing rate 99.997% during 30min.Next is iron bacteria (FB), sterilizing rate 96.0% when handling 20min, and sterilizing rate is 99.8% during 30min.That slower slightly is sulphate reducing bacteria (SRB), and sterilizing rate is 93.5% during 20min, is 99.975% during 30min.
Table 9
| Composition | pH | Colourity | Suspended substance | BOD 5 | COD cr | Petroleum-type | Volatile phenol | Ammonia nitrogen | Negatively charged ion (LAS) |
| After the primary standard secondary standard grade III Standard processing pre-treatment (30min) | 6-9 6-9 6-9 8-9 6-7 | 50 80 - 60 15 | 70 200 400 91.5 41.7 | 30 60 300 124.3 8.65 | 100 150 500 1237.9 51.6 | 10 10 30 118.2 6.9 | 0.5 0.5 2.0 2.4 1.8 | 10 10 20 244.3 6.93 | 5.0 10 20 17.65 3.39 |
Annotate: suspended substance, BOD in the table
5, COD
Cr, unit such as petroleum-type, volatile phenol, ammonia nitrogen, negatively charged ion is mg/L.
Oil field extracted water is being handled back significant parameter variation as Fig. 9 through catalytic oxidation.COD after the result treatment
Cr, HPAM content, BOD
5, oil, volatile phenol, ammonia nitrogen, anion-content, colourity and suspension content all reach the primary standard of sewage discharge, pH value of solution raises in the reaction process.Handling back sewage just can make all indexs reach first discharge standard through suitably neutralizing.
Embodiment 19: the reaction unit of (referring to Fig. 1) present embodiment is made up of reactor 1, anode 2, negative electrode 3, thief hole 4, agitator 5, venting hole 6, direct supply 7, voltmeter 8 and reometer 9.Anode 2, negative electrode 3 and agitator 5 are in reactor 1; Thief hole 4 is communicated with the outer lower portion of reactor 1; Venting hole 6 is communicated with the upper end of reactor 1; The positive pole of direct supply 7, voltmeter 8 and reometer 9 links to each other with anode 2, and the negative pole of direct supply 7, voltmeter 8 and reometer 9 is connected with negative electrode 3, and direct supply 7, voltmeter 8 and reometer 9 parallel connections; Other is identical with embodiment one.
The present invention has that technology is simple, structure of reactor is simple, treatment effect is good, sludge quantity is little, save electricity, non-secondary pollution and can handle the advantage of the oil field extracted water that high salinity, differing temps and COD value are high, viscosity is high, bacteria content is high.
Claims (10)
1, the degrading and viscosity reducing process of a kind of oil-containing and polymer sewage, it is characterized in that it is as follows to the step of disposing polluted water in oil: one, will contain the polymer sewage from oil extraction feeding and be equipped with in the reactor (1) of anode (2), negative electrode (3) and agitator (5), two, agitator (5) with in stir at a slow speed, under the condition of normal temperature, the acidic medium in reactor (1), the bath voltage of 10～30V, 75～80mA/cm
2Current density, under the effect of anode (2) and negative electrode (3), handle 20min～50min.
2,, it is characterized in that the acidic medium in step 2 is HCl, its PH=1～6 according to the degrading and viscosity reducing process of right 1 described a kind of oil-containing and polymer sewage.
3, according to the degrading and viscosity reducing process of right 1 described a kind of oil-containing and polymer sewage, it is characterized in that having increased additive in step 2, additive is NaCl or CaCl
2
4, according to the degrading and viscosity reducing process of right 1 described a kind of oil-containing and polymer sewage, it is characterized in that having increased cocatalyst in step 2, cocatalyst is for containing Ce
4+And La
3+The ionic lucium.
5, according to the degrading and viscosity reducing process of right 1 described a kind of oil-containing and polymer sewage, the material that it is characterized in that anode (2) is iron, aluminium, stainless steel, charcoal steel, is shaped as tabularly, and thickness is 0.5～3mm.
6, according to the degrading and viscosity reducing process of right 1 described a kind of oil-containing and polymer sewage, it is characterized in that the material of negative electrode (3) is stainless steel or carbon steel, be shaped as tabularly that thickness is 0.5～3mm.
7,, it is characterized in that the spacing between anode (2) and the negative electrode (3) is 1-10cm, and adopt many group parallel arrangements according to the degrading and viscosity reducing process of right 1 described a kind of oil-containing and polymer sewage.
8,, it is characterized in that agitator is mechanical stirrer, magnetic stirring apparatus or ultrasonic agitation device according to the degrading and viscosity reducing process of right 1 described a kind of oil-containing and polymer sewage.
9,, it is characterized in that reactor is two-dimentional reactor according to the degrading and viscosity reducing process of right 1 described a kind of oil-containing and polymer sewage.
10, the degrading and viscosity reducing process of a kind of oil-containing according to claim 1 and polymer sewage, it is characterized in that to the oil field contain the produced water disposal of polymkeric substance the time parameter be: anode (2) is used stainless steel, and negative electrode (3) is with 20
#Steel, bath voltage are 20V, and current density is 75-80mA/cm
2, the distance between anode (2) and the negative electrode (3) is 2cm, the polymer concentration that contains of preparation is 1000mg/L, wherein the oil field is with the molecular-weight average 1,680 ten thousand of polyacrylamide, magnetic stirring apparatus with in stir at a slow speed, 20min is handled in the pH=4 of acidic medium～6.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101798130A (en) * | 2010-04-02 | 2010-08-11 | 中国科学院苏州纳米技术与纳米仿生研究所 | Wastewater treatment method based on electro-Fenton reaction |
| CN101602531B (en) * | 2009-07-16 | 2011-07-20 | 华南理工大学 | Electrochemical method of oil removal of wastewater produced in oil extraction by polymer flooding displacement |
| CN105298458A (en) * | 2015-11-28 | 2016-02-03 | 东北石油大学 | Method for relieving downward lag of polymer flooding production well sucker rod |
| CN105419772A (en) * | 2015-12-25 | 2016-03-23 | 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 | Polyacrylamide polymer viscosity reducer |
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| CN1137857C (en) * | 2001-01-05 | 2004-02-11 | 中国石油化工股份有限公司 | Oily sewage processing method |
| CN1179891C (en) * | 2001-05-18 | 2004-12-15 | 傅绍斌 | Process for treating oil field sewage |
| DE10222598A1 (en) * | 2002-05-17 | 2003-11-27 | Dbt Gmbh | conveyor pan |
| CN1328181C (en) * | 2005-06-28 | 2007-07-25 | 陕西师范大学 | Treater of sewage by electrochemistr catalyzing oxidizing |
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| CN105419772B (en) * | 2015-12-25 | 2018-09-18 | 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 | A kind of thinner of polyacrylamide polymer |
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| CN106587453A (en) * | 2016-12-30 | 2017-04-26 | 中国石油大学(华东) | Treatment method of alkaline-surfactant-polymer flooding wastewater |
| CN106587453B (en) * | 2016-12-30 | 2020-10-30 | 中国石油大学(华东) | Treatment method of ternary combination flooding wastewater |
| CN113087091A (en) * | 2019-12-23 | 2021-07-09 | 天津大学 | Application of W element doped cerium oxide catalyst in degradation of oily sewage |
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