CN101028944A - Composite electrolytic bath and method for electrolyzing and decoloring pulp-making effluent - Google Patents

Composite electrolytic bath and method for electrolyzing and decoloring pulp-making effluent Download PDF

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CN101028944A
CN101028944A CN 200710026285 CN200710026285A CN101028944A CN 101028944 A CN101028944 A CN 101028944A CN 200710026285 CN200710026285 CN 200710026285 CN 200710026285 A CN200710026285 A CN 200710026285A CN 101028944 A CN101028944 A CN 101028944A
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plate
electrode
combined electrolysis
electrolysis
pulp
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CN100506713C (en
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陈元彩
何北海
李友明
林鹿
胡志军
李海明
雷利荣
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South China University of Technology SCUT
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Abstract

A composite electrolyzer for the electrolytic decoloring of chemico-mechanical pulping sewage is composed of multiple unit electrolyzers formed by dividing the composite electrolyzer by bulkheads and containing the plate anode, plate cathode and filler layer consisting of electric conductive particles and inertial particles, a supporting air distributing plate, aerating tube and sludge bath. Its electrolytic decoloring method for the chemico-mechanical pulping sewage includes such steps as flitering by oblique net, regulating pH=3-3.5, depositing, filtering and decoloring in said composite electrolyzer.

Description

The method of combined electrolysis groove and the decolouring of change machine pulp-making effluent combined electrolysis thereof
Technical field
The present invention relates to the devices and methods therefor of a kind of chemical machinery pulp-making effluent electrochemistry decolouring, especially relate to semi-chemical pulp waste liquid, Alkaline Peroxide Mechanical Pulp waste liquid and sulfonation machine pulp wastes such as being used for pine, poplar, Eucalyptus a kind of combined electrolysis method decolouring the combined electrolysis groove and meet the method for electrolysis process.
Background technology
Chemimechanical pulp is one of advanced pulping process that integrates chemical treatment and mechanical treatment, and it has plurality of advantages such as yield height, reduced investment, pulp strength be good.From the seventies, begun the production of thermomechanical pulp and CTMP abroad, produced newsprinting paper, high-grade printing paper and packing board in South America and North America.Because change machine slurry has Chemical Pretreatment, makes it not be only applicable to the pine of resin content height, fiber bulky, also is applicable to leaf woods such as poplar, Eucalyptus.
Major technique and method for the decolouring of pulping and paper-making waste liquid has flocculence, absorption method, oxidation style, biological process and membrane separation process etc. both at home and abroad.Compare with black liquid, though the pollution load decrease to some degree of the waste water that high yield machine slurry is discharged, but still contain and colourity, COD and BOD 5All very high, complicated component, foamer is many, change of water quality is big in the production process, the inorganic salt such as inferior sulfate radical, sulfate radical and sodium salt that not only contain high density in the waste liquid, and contain the multiple toxic chemical substance of microbial growth in the inhibition waste liquid, obviously be impracticable directly with common biodegradation method.High chroma, high-pollution load are that restrictionization machine slurry is used for one of major reason of paper industry.
Comprehensive paper waste Processing Technology both at home and abroad, the simple treatment technologies such as flocculation, oxidation, absorption and biological process that adopt, the percent of decolourization that high working cost and biological process are handled this class waste water is lower, be difficult to reach emission standard, often be difficult to reach emission standard, the process integration that the thing of delivering a child after the employing leading portion reinforcement pre-treatment is handled is both economical, reasonable, is the main research and the application trend of present paper waste process field.But adopt the coagulating sedimentation pre-treatment, inorganic flocculating agent not only consumption is big, required pH narrow range, and it is many to produce sludge quantity, and decolorizing effect is often unsatisfactory.Though organic floculant has flocculating decoloring effect preferably, wide to the wastewater pH area requirement, cost an arm and a leg, because the high density of waste liquid is easy to make the coagulating agent inactivation, and processing cost is high.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of combined electrolysis groove that is used for a kind of combined electrolysis method decolouring of semi-chemical pulp waste liquid, Alkaline Peroxide Mechanical Pulp waste liquid and sulfonation machine pulp wastes such as pine, poplar, Eucalyptus is provided.
Another object of the present invention is to provide a kind of lignin acidizing separation, dynamic complex electrolysis combined technology of utilizing, can handle the method for the change machine pulp-making effluent combined electrolysis decolouring of high density, high chroma.
Purpose of the present invention is achieved through the following technical solutions:
A kind of combined electrolysis groove, be separated into a plurality of electrolyzer units by dividing plate, the negative plate of each electrolyzer unit both sides and positive plate opposing parallel are provided with, be provided with the packing layer of conducting particles electrode and inert particle electrode in the electrolyzer unit, the volume ratio of conducting particles electrode and inert particle electrode is 1: 1~2: 1; Bottom of electrolytic tank is provided with aeration tube, and the aeration tube bottom is provided with sludge sump;
Described conducting particles electrode is that a plurality of diameters are less than 5mm, height is formed less than the cylindrical particle of 1mm, by percentage to the quality, cylindrical particle is by 80~84% iron powders, 5~15% activated carbon powders, 3~5% calcium lignin sulphonates, 1~2% cupric oxide, 1% zinc oxide and 0.3~1% nickel oxide sinter molding; During preparation, earlier matrix material is squeezed into the post strip that diameter is 5mm, cuts into and highly be the column of 1mm, again 480 ℃ with the anoxybiotic condition under sintering 2 hours, the formation diameter is 5mm, highly is the cylindrical particle of 1mm.
Described inert particle electrode is that a plurality of diameters are less than 5mm, height is formed less than the cylindrical particle of 1mm, by percentage to the quality, cylindrical particle is by 18~20% iron powders, 20~30% activated carbon powders, 40~60% clays, 3~8% calcium lignin sulphonates, 1% cupric oxide, 1% zinc oxide and 0.1~1% nickel oxide sinter molding.During preparation, earlier matrix material is squeezed into the post strip that diameter is 5mm, cuts into and highly be the column of 1mm, again 480 ℃ with the anoxybiotic condition under sintering 2 hours, the formation diameter is 5mm, highly is the cylindrical particle of 1mm.
Plate is a matrix with the titanium sheet, earlier through pre-treatment such as mechanical polishing acid etchings, prepares active intermediate SnO by thermal decomposition method again 2+ Sb 2O 3+ MnO 2, promptly prepare SnO successively by thermal decomposition method 2Layer, Sb 2O 3Layer and MnO 2Layer.Increase the good combination of coating and matrix, improve electropotential, solved the problem of surperficial easy adsorbed product.Cathode plate then is a stainless steel plate.
The method of a kind ofization machine pulp-making effluent combined electrolysis method decolouring comprises the steps and processing condition:
(1) fiber recovery: pulping waste liquor is at first used oblique net filtration, and screen cloth is 50~80 orders; Because it is quite high to change the concentration of suspension of machine pulp waste, if can not remove the suspended substance in the waste water fully, will strengthen follow-up processing load, it is 50~80 orders that waste liquid is used oblique net filtration, screen cloth earlier; After fiber recovery, enter water collecting basin.
(2) lignin acidizing separation, suspended substance are handled: it is 3~3.5. that the waste liquid acidity that step (1) is handled is reduced to pH value, precipitate 1.5~2 hours, and the generation lignin acidizing separation precipitates part chroma pollution thing and most suspended substance.
(3) the post precipitation water body that obtains of step (2) enters the combined electrolysis wastewater treatment equipment, compound little electrolytic waste water treatment equipment is by effective combination of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech, by the direct catalytic oxidation reduction of electrode, active substance ([H] and the Fe that electrode produces 2+, OH and H 2O 2Deng) the indirect redoxomorphism and the high electric current spatiotemporal efficiency of three-diemsnional electrode, intensive treatment waste water.
(3) combined electrolysis method decolouring: the described combined electrolysis groove of the filtrate claim 1 of post precipitation is decoloured, extra electric field provides 20~30V after rectification volts DS, adopt TPR constant current constant voltage power supply to supply with current/voltage, reacted 60~120 minutes, water outlet pH value is controlled to be 5~6.5, gas-water ratio is 3: 1, uses the air compressor machine air feed;
(4) inclined-plate clarifying basin precipitation: the water outlet that step (3) is obtained adds alkali adjusting pH value to 8.5~9, enters inclined-plate clarifying basin, and supernatant liquor is discharged, and mud is sunken in the pool bottom sludge groove.
(5), it can be delivered to iron work ironmaking or make material of construction with cement, sand fusion for the processing of mud.
Described pulping waste liquor is mechanical pulp waste liquid, semi-chemical pulp waste liquid, Alkaline Peroxide Mechanical Pulp waste liquid and sulfonation machine pulp waste.
The decolouring of micro-electrolysis method papermaking wastewater of the present invention is to utilize the carbon containing iron filings to form countless small galvanic cells in waste water, directly passes through [H] and the Fe of nascent state of the newborn atomic state of electrochemistry product 2+With pollutants in waste water generation redoxomorphism, remove COD and colourity in the waste water.Because the reaction of the galvanic cell of micro-electrolysis method is that spontaneous reaction does not need consume electric power, and iron filings are a kind of very common industrial waste low prices, the expense of micro-electrolysis treatment waste liquid is mainly derived from adjusting pH need add sulfur waste acid and lime, therefore the decolouring processing costs of micro-electrolysis method papermaking wastewater is lower, but has easy caking, back flushing or regenerate problem such as frequent.
The decolouring of electrolytic process papermaking wastewater mainly is the Fe (OH) that produces by electrolysis 3The ClO that generates when the flocculating settling effect of flco and electrolysis -Deng the high valence state active group of chlorion, come the chromophoric group in the oxidation destruction waste water, reach the purpose of removing colourity, but it is bigger to exist power consumption, running cost is than problems such as height.
The present invention is directed to the decolouring of micro-electrolysis method and electrolytic process waste liquid and handle the deficiency that exists, decolouring by carrying out of combined electrolysis method machine slurry papermaking wastewater has been proposed, the combined electrolysis method is the associating by three-diemsnional electrode, catalytic oxidation and micro electrolysis tech, positive/negative plate electrode, conducting particles electrode and inert particle electrode are equipped with in device inside, wherein, conducting particles is based on the little electrolytic action of iron powder, and inert particle then plays anti-short circuit effect, and the pole plate electrode adopts titanium base SnO 2+ Sb 2O 3+ MnO 2Coated electrode has solved electrode and has easily come off as the electrolytic anode of overpotential, and electropotential is not high, and work-ing life is short, and the surface is the problem of adsorbed product easily.The free radical of the nascent state that produces in the reaction process and coagulating agent, collection redox, flocculation absorption, catalyzed oxidation, complexing and deposition etc. act as one, and pollutants in waste water is removed rapidly.By the direct catalytic oxidation reduction of electrode, active substance ([H] and the Fe that electrode produces 2+, OH and H 2O 2Deng) the indirect redoxomorphism and the high electric current spatiotemporal efficiency of three-diemsnional electrode, intensive treatment waste water.
The present invention compares with existing method, has following advantage:
(1) at first remove part lignin and suspended substance in the waste liquid by screen filtration, acidifying lignin precipitation,
(2) decolouring of combined electrolysis method papermaking wastewater is by the combination of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech, by the direct catalytic oxidation reduction of electrode, active substance ([H] and the Fe that electrode produces 2+, OH and H 2O 2Deng) the indirect redoxomorphism and the high electric current spatiotemporal efficiency of three-diemsnional electrode, intensive treatment waste water adopts three-diemsnional electrode or fluidized bed electrochemical reactor, utilizes its higher mass transfer specific surface area, improves electrochemical reactor efficient.The combined electrolysis method has that device structure is simple, applied widely, treatment effect is good, working cost is cheap, convenient operating maintenance and easily and advantages such as other method of wastewater treatment couplings.
Description of drawings
Fig. 1 is a combined electrolysis groove structural representation of the present invention.
Shown in the figure: 1 aeration tube; 2 inert particle electrodes; 3 conducting particles electrodes; 4 anodes; 5 negative electrodes; 6 dividing plates; 7 combined electrolysis grooves; 8 support air distribution plate; 9 sludge sumps
Embodiment
The present invention is further illustrated below by embodiment, but the scope of protection of present invention is not limited to the scope of embodiment statement.
As shown in Figure 1, combined electrolysis groove of the present invention is separated into a plurality of electrolyzer units by dividing plate 6, the negative plate 5 of each electrolyzer unit both sides and positive plate 4 opposing parallel settings, be provided with the packing layer of conducting particles electrode 3 and inert particle electrode 2 in the electrolyzer unit, the volume ratio of conducting particles electrode 3 and inert particle electrode 2 is 1: 1~2: 1; Bottom of electrolytic tank is provided with aeration tube 1, and aeration tube 1 bottom is provided with sludge sump 9.Aeration tube 1 is positioned at and supports air distribution plate 8 belows, by supporting air distribution plate 8 even gas distributions.
Embodiment 1
Handle blue gum machine pulp waste water with the inventive method, waste water quality is: colourity: 6490C.U. COD:11600mg/L, BOD:2920mg/L, SS:1390mg/L.
(1) earlier to use oblique net filtration, screen cloth be 80 orders to waste liquid; After fiber recovery, enter water collecting basin.
(2) adding hydrochloric acid, waste liquid acidity is reduced to the pH value is 3; Precipitate 2 hours, lignin acidizing separation takes place, precipitation is chroma pollution thing and most suspended substance partly.
(3) the post precipitation water body that obtains of step (2) enters the combined electrolysis wastewater treatment equipment, and compound little electrolytic waste water treatment equipment is by effective combination of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech.
Wherein, combined electrolysis groove (7) is inner to be divided into four chambers by dividing plate with reactor, current are advanced in the plug-flow mode in reactor, guaranteeing has sufficient the contact in waste liquid and the granule electrode, battery lead plate is equipped with in the reactor both sides, adopt TPR constant current constant voltage power supply to supply with current/voltage, negative plate (5) and positive plate (4) opposing parallel setting, device inside mainly comprises the packing layer of conducting particles electrode (3) and inert particle electrode (2), dividing plate (6), support air distribution plate (8), aeration tube (1), sludge sump parts such as (9), extra electric field provides the 30V after rectification volts DS, react after 120 minutes, water outlet pH is controlled to be 6.5, reactor bottom is provided with micro-hole aerator, uses the air compressor machine air feed, gas-water ratio 3: 1.
Filler is made up of conducting particles (3) and inert particle (2) (volume ratio 2: 1) electrode, wherein conducting particles electrode (below be all mass ratio) is by 84% iron powder, 8% activated carbon powder, 4% calcium lignin sulphonate, 2% cupric oxide, 1% zinc oxide, 1% nickel oxide, being squeezed into diameter is the post strip of 5mm, cut into highly and to be the column of 1mm, sintering is 2 hours under 480 ℃ and anoxybiotic condition, and the formation diameter is 5mm, highly is the column of 1mm.
Inert particle electrode (mass ratio) is by 20% iron powder, 22.8% activated carbon powder, 50% clay, 5% calcium lignin sulphonate, 1% cupric oxide, 1% zinc oxide, 0.2% nickel oxide, being squeezed into diameter is the post strip of 5mm, cut into highly and to be the column of 1mm, sintering is 2 hours under 480 ℃ and anoxybiotic condition, and the formation diameter is 5mm, highly is the column of 1mm.
Plate (4) is a matrix with the titanium sheet, earlier through pre-treatment such as mechanical polishing acid etchings, prepares active intermediate SnO by thermal decomposition method again 2+ Sb 2O 3+ MnO 2, the good combination of increase coating and matrix improves electropotential, and the surface is the problem of adsorbed product easily.Cathode plate (5) then is a stainless steel plate.
(4) water outlet that obtains of step (3) adds sodium hydroxide and regulates pH to 8.5, enters inclined-plate clarifying basin, and supernatant liquor is discharged, and mud then is sunken in the pool bottom sludge groove.
(5), it can be delivered to iron work ironmaking or make material of construction with cement, sand fusion for the processing of mud.
Treatment effect is analyzed:
This test adopts electrochemical process to handle Eucalyptus machine pulp waste water, compares with little electrolysis, poly-iron PFC and poly-aluminium PAC, and the usefulness of poly-iron and poly-aluminium is measured its optimum handling effect and compared, and the result is as shown in table 1.
The comparison of table 1 treatment effect and cost
Processing mode Add-on/mg.L-1 Percent of decolourization/% COD clearance/% SS clearance/%
PAC PFC micro-electrolysis method combined electrolysis method 400 800 - - 23.6 30.2 85.7 96.2 18.6 20.6 44.1 62.0 91 91 90 98
As shown in Table 1, the removal effect of colourity, SS and the COD of the processing machine pulp waste water of combined electrolysis method reaches 96.2%, 98 and 62% respectively, significantly is better than the Coagulation Method of conventional poly-iron and poly-aluminium, is higher than micro-electrolysis method.
Embodiment 2
Handle poplar machine pulp waste water with the inventive method, waste water quality is: colourity: 5890C.U., COD:8600mg/L, BOD:2120mg/L, SS:560mg/L.
(1) earlier to use oblique net filtration, screen cloth be 50 orders to waste liquid; After fiber recovery, enter water collecting basin.
(2) adding hydrochloric acid, waste liquid acidity is reduced to the pH value is 3.5; Precipitate 1.5 hours, lignin acidizing separation takes place, precipitation is chroma pollution thing and most suspended substance partly.
(3) the post precipitation water body that obtains of step (2) enters the combined electrolysis wastewater treatment equipment, and compound little electrolytic waste water treatment equipment is by effective combination of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech.
Wherein, combined electrolysis groove (7) is inner to be divided into four chambers by dividing plate with reactor, current are advanced in the plug-flow mode in reactor, guaranteeing has sufficient the contact in waste liquid and the granule electrode, battery lead plate is equipped with in the reactor both sides, adopt TPR constant current constant voltage power supply to supply with current/voltage, negative plate (5) and positive plate (4) opposing parallel setting, device inside mainly comprises the packing layer of conducting particles electrode (3) and inert particle electrode (2), dividing plate (6), support air distribution plate (8), aeration tube (1), sludge sump parts such as (9), extra electric field provides the 25V after rectification volts DS, react after 90 minutes, water outlet pH is controlled to be 5.5, reactor bottom is provided with micro-hole aerator, uses the air compressor machine air feed, gas-water ratio 3: 1.
Filler is made up of conducting particles (3) and inert particle (2) (volume ratio 1.5: 1) electrode, wherein conducting particles electrode (below be all mass ratio) is by 80% iron powder, 12.3% activated carbon powder, 5% calcium lignin sulphonate, 1% cupric oxide, 1% zinc oxide, 0.7% nickel oxide, being squeezed into diameter is the post strip of 5mm, cut into highly and to be the column of 1mm, sintering is 2 hours under 480 ℃ and anoxybiotic condition, and the formation diameter is 5mm, highly is the column of 1mm.
Inert particle electrode (mass ratio) is by 20% iron powder, 22.8% activated carbon powder, 50% clay, 5% calcium lignin sulphonate, 1% cupric oxide, 1% zinc oxide, 0.2% nickel oxide, being squeezed into diameter is the post strip of 5mm, cut into highly and to be the column of 1mm, sintering is 2 hours under 480 ℃ and anoxybiotic condition, and the formation diameter is 5mm, highly is the column of 1mm.
Plate (4) is a matrix with the titanium sheet, earlier through pre-treatment such as mechanical polishing acid etchings, prepares active intermediate SnO by thermal decomposition method again 2+ Sb 2O 3+ MnO 2, the good combination of increase coating and matrix improves electropotential, and the surface is the problem of adsorbed product easily.Cathode plate (5) then is a stainless steel plate.
(4) water outlet that obtains of step (3) the pH value situation that need look waste water adds sodium hydroxide and regulates pH value to 9, enters inclined-plate clarifying basin, and supernatant liquor is discharged, and mud then is sunken in the pool bottom sludge groove.
(5), it can be delivered to iron work ironmaking or make material of construction with cement, sand fusion for the processing of mud.
Treatment effect is analyzed:
This test adopts electrochemical process to handle poplar machine pulp waste water, and the result is as shown in the table.
Table 2 poplar treatment effect and cost
Percent of decolourization/% BOD clearance/% COD clearance/% SS clearance/%
The combined electrolysis method 92 59.3 61.0 96
Can be as can be known by table 2, the processing poplar machine pulp waste water of combined electrolysis method has treatment effect preferably, and the removal effect of its colourity, BOD, SS and COD reaches 92%, 59.3%, 96% and 61.0% respectively.
Embodiment 3
Handle poplar machine pulp waste water with the inventive method, waste water quality is: colourity: 3890C.U., COD:4600mg/L, BOD:920mg/L, SS:370mg/L.
(1) earlier to use oblique net filtration, screen cloth be 50 orders to waste liquid; After fiber recovery, enter water collecting basin.
(2) adding hydrochloric acid, waste liquid acidity is reduced to the pH value is 4; Precipitate 1.5 hours, lignin acidizing separation takes place, precipitation is chroma pollution thing and most suspended substance partly.
(3) the post precipitation water body that obtains of step (2) enters the combined electrolysis wastewater treatment equipment, and compound little electrolytic waste water treatment equipment is by effective combination of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech.Wherein, combined electrolysis groove (7) is inner to be divided into four chambers by dividing plate with reactor, current are advanced in the plug-flow mode in reactor, guaranteeing has sufficient the contact in waste liquid and the granule electrode, battery lead plate is equipped with in the reactor both sides, adopt TPR constant current constant voltage power supply to supply with current/voltage, negative plate (5) and positive plate (4) opposing parallel setting, device inside mainly comprises the packing layer of conducting particles electrode (3) and inert particle electrode (2), dividing plate (6), support air distribution plate (8), aeration tube (1), sludge sump parts such as (9), extra electric field provides the 20V after rectification volts DS, react after 60 minutes, water outlet pH is controlled to be 6.5, reactor bottom is provided with micro-hole aerator, uses the air compressor machine air feed, gas-water ratio 3: 1.
Filler is made up of conducting particles (3) and inert particle (2) (volume ratio 1: 1) electrode, wherein conducting particles electrode (below be all mass ratio) is by 80% iron powder, 12.7% activated carbon powder, 5% calcium lignin sulphonate, 1% cupric oxide, 1% zinc oxide, 0.3% nickel oxide, being squeezed into diameter is the post strip of 5mm, cut into highly and to be the column of 1mm, sintering is 2 hours under 480 ℃ and anoxybiotic condition, and the formation diameter is 5mm, highly is the column of 1mm.
Inert particle electrode (mass ratio) is by 18% iron powder, 24.8% activated carbon powder, 50% clay, 5% calcium lignin sulphonate, 1% cupric oxide, 1% zinc oxide, 0.2% nickel oxide, being squeezed into diameter is the post strip of 5mm, cut into highly and to be the column of 1mm, sintering is 2 hours under 480 ℃ and anoxybiotic condition, and the formation diameter is 5mm, highly is the column of 1mm.
Plate (4) is a matrix with the titanium sheet, earlier through pre-treatment such as mechanical polishing acid etchings, prepares active intermediate SnO by thermal decomposition method again 2+ Sb 2O 3+ MnO 2, the good combination of increase coating and matrix improves electropotential, and the surface is the problem of adsorbed product easily.Cathode plate (5) then is a stainless steel plate.
(4) water outlet that obtains of step (3) adds sodium hydroxide and regulates pH value to 8.5, enters inclined-plate clarifying basin, and supernatant liquor is discharged, and mud then is sunken in the pool bottom sludge groove.
(5), it can be delivered to iron work ironmaking or make material of construction with cement, sand fusion for the processing of mud.
Treatment effect is analyzed:
This test adopts electrochemical process to handle poplar machine pulp waste water, and the result is as shown in the table.
Table 3 poplar treatment effect and cost
Percent of decolourization/% BOD clearance/% COD clearance/% SS clearance/%
The combined electrolysis method 96 63 72 98
Can be as can be known by table 3, the processing poplar machine pulp waste water of combined electrolysis method has treatment effect preferably, and the removal effect of its colourity, BOD, SS and COD reaches 96%, 63%, 98% and 72% respectively.

Claims (4)

1, a kind of combined electrolysis groove, it is characterized in that this combined electrolysis groove is separated into a plurality of electrolyzer units by dividing plate (6), negative plate of each electrolyzer unit both sides (5) and positive plate (4) opposing parallel setting, be provided with the packing layer of conducting particles electrode (3) and inert particle electrode (2) in the electrolyzer unit, the volume ratio of conducting particles electrode (3) and inert particle electrode (2) is 1: 1~2: 1; Bottom of electrolytic tank is provided with aeration tube (1), and aeration tube (1) bottom is provided with sludge sump (9);
Described conducting particles electrode (3) is that a plurality of diameters are less than 5mm, height is less than the cylindrical particle of 1mm, by percentage to the quality, cylindrical particle is by 80~84% iron powders, 5~15% activated carbon powders, 3~5% calcium lignin sulphonates, 1~2% cupric oxide, 1% zinc oxide and 0.3~1% nickel oxide sinter molding;
Described inert particle electrode (2) is that a plurality of diameters are less than 5mm, height is less than the cylindrical particle of 1mm, by percentage to the quality, cylindrical particle is by 18~20% iron powders, 20~30% activated carbon powders, 40~60% clays, 3~8% calcium lignin sulphonates, 1% cupric oxide, 1% zinc oxide and 0.1~1% nickel oxide sinter molding.
2, combined electrolysis groove according to claim 1 is characterized in that described plate (4) is a matrix with the titanium sheet, earlier through the pre-treatment of mechanical polishing acid etching, prepares SnO by thermal decomposition method again 2+ Sb 2O 3+ MnO 2Active intermediate obtains; Described cathode plate is a stainless steel plate.
3, the method for a kind ofization machine pulp-making effluent combined electrolysis method decolouring is characterized in that comprising the steps and processing condition:
(1) fiber recovery: pulping waste liquor is at first used oblique net filtration, and screen cloth is 50~80 orders;
(2) lignin acidizing separation, suspended substance are handled: it is 3~3.5 that the waste liquid acidity that step (1) is handled is reduced to the pH value, precipitates 1.5~2 hours;
(3) combined electrolysis method decolouring: the described combined electrolysis groove of the filtrate claim 1 of post precipitation is decoloured, and extra electric field provides 20~30V volts DS after rectification, electrolysis 60~120 minutes, and water outlet pH value is controlled to be 5~6.5, and gas-water ratio is 3: 1;
(4) inclined-plate clarifying basin precipitation: the water outlet that step (3) is obtained adds alkali adjusting pH value to 8.5~9, enters inclined-plate clarifying basin, and supernatant liquor is discharged, and mud is sunken in the pool bottom sludge groove.
4, the method for a kind ofization machine pulp-making effluent combined electrolysis method decolouring according to claim 3 is characterized in that pulping waste liquor is mechanical pulp waste liquid, semi-chemical pulp waste liquid, Alkaline Peroxide Mechanical Pulp waste liquid and sulfonation machine pulp waste.
CNB2007100262856A 2007-01-12 2007-01-12 Composite electrolytic bath and method for electrolyzing and decoloring pulp-making effluent Expired - Fee Related CN100506713C (en)

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