CN105060580A - Method for treating heavy metal wastewater through electric flocculation-chemical precipitation - Google Patents
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Abstract
The invention provides a method for treating heavy metal wastewater through electric flocculation-chemical precipitation. The method comprises the following steps: regulating the pH value of wastewater, performing electric flocculation treatment in an electric flocculation reactor for 30-60 min, adding a settling agent for sedimentation for 10-30 min and then discharging water. According to the method for treating heavy metal wastewater through electric flocculation-chemical precipitation, provided by the invention, heavy metal wastewater containing trace heavy metal ions is firstly subjected to electric flocculation, ions produced by electrolysis are hydrolyzed to produce a great deal of polyhydroxy compounds, the polyhydroxy compounds are subjected to reaction, absorption and chelation with trace heavy metal ions, therefore a large proportion of heavy metal ions can be gathered, and besides, the settling agent is added for further gathering the heavy metal ions, the settling agent has a synergistic effect with the electrochemical floccules, and at the same time the obtained flocculating constituents start to precipitate, finally, the obtained effluent can be enabled to meet the emission standard.
Description
Technical field
The invention belongs to sewage treatment area, relate to a kind of method of electricity flocculation-chemical precipitation process heavy metal wastewater thereby, particularly relate to a kind of method of electricity flocculation-chemical precipitation process low concentration heavy metal water.
Background technology
Heavy metal wastewater thereby refers to the trade effluent containing heavy metal ion such as chromium, cadmium, nickel and lead.Mechanical industry, mine smelting industry and part chemical enterprise can produce heavy metal wastewater thereby in process of production, the concentration <50mg/L of this kind of waste water heavy metal ion after various preliminary treatment, but the heavy metal wastewater thereby containing micro heavy ion of this lower concentration reaches discharging standards not yet, if directly discharge can cause water pollution, and by soil, water, air, particularly by food chain, directly serious harm is caused to human health.Therefore, one of problem demanding prompt solution in environment protection has been become to the purifying treatment of the low concentration heavy metal water containing micro heavy ion.
The treatment process of current heavy metal wastewater thereby has chemical precipitation, chemical flocculation, electrolytic reduction, membrane separation process and chemisorption etc., and various treatment process respectively has relative merits.Planting as first three the subject matter that treatment process exists is: the serious and effective processing rate of secondary pollution is low; Membrane separation process exists that film easily pollutes, cost is high and the problem such as membrane lifetime is short; Chemisorption exists that adsorption rate is low, sorbent material is expensive and the difficulty such as difficult life.Any single treatment process can not meet the requirement of present heavy metal discharge, therefore adopts technique coupling technique to become the important development direction of heavy metal treatment process.In recent years in heavy metal containing wastewater treatment field, it is more and more extensive that electrochemistry flocculation technique is applied, this contains the multiple reactions such as electrolytic reduction, electrofloatation and adsorption-flocculation due to electrochemistry flocculation process and acts synergistically between each reaction, thus can fast and process heavy metal wastewater thereby efficiently, and simple to operate, or seldom can not produce secondary pollution etc., but single electrochemistry flocculation technique is bad to micro heavy treatment effect, and current consumption greatly, costly DeGrain.
Patent CN102001779A discloses a kind of electricity flocculation-active carbon adsorption that utilizes to process the method for heavy metal-containing electroplating effluent, in order to adsorb the low-concentration heavy metal after electricity flocculation, the method is follow-up have employed charcoal absorption, after absorption, gac needs regeneration, make this technological operation comparatively complicated and level of automation is low, gac link improves a ton cost of water treatment to a certain extent simultaneously.Patent CN103193343A discloses a kind of method utilizing electricity flocculation-ion exchange method to carry out advanced treatment chromate waste water, after electric flocculation treatment, the heavy metal of lower concentration adopts the method for ion-exchange to reduce its concentration further, although waste water after treatment reaches emission standard, but ion exchange resin easily pollutes, need desorption and regeneration, add technical process, complicated operation.
In sum, in order to promote the application of electrochemistry flocculation technique in heavy metal wastewater thereby industry, be necessary to improve traditional electrochemistry flocculation technique again, to reduce process energy consumption and cost.
Summary of the invention
For the secondary pollution existed in heavy metal waste water treatment process in prior art, processing efficiency is low, film easily pollutes, adsorption rate is low, sorbent material is expensive and difficult life, ion exchange resin easily pollute, cost is high and the problem such as complicated operation, the invention provides a kind of method of electricity flocculation-chemical precipitation process low concentration heavy metal water.First the method carries out electricity flocculation to the heavy metal wastewater thereby containing micro heavy ion, the ion hydrolysis that electrolysis produces produces a large amount of polyol and reacts with the heavy metal ion of trace, to adsorb and chelating etc. is done in order to the most heavy metal ion of enrichment, then by adding settling agent, further enriching heavy metal ion, flocculates with electricity and acts synergistically; The flocs unit of gained starts precipitation, finally makes gained water outlet meet emission standard.
For reaching this object, the present invention by the following technical solutions:
The invention provides a kind of method of electricity flocculation-chemical precipitation process heavy metal wastewater thereby, said method comprising the steps of: the pH value regulating waste water, in electric flocculation reactor, carry out electric flocculation treatment 30 ~ 60min, then add water outlet after settling agent sedimentation 10 ~ 30min.
Wherein, the electric flocculation treatment time can be 30min, 40min, 50min, 60min etc.; Settling time can be 10min, 13min, 15min, 17min, 20min, 23min, 25min, 27min or 30min etc.
Electric flocculation treatment process in the present invention comprises the kinds of reaction such as electrochemistry flocculation, air supporting and flocculation sediment.
In the present invention, the pH regulating waste water is 4 ~ 9, such as 4,5,6,7,8 or 9 etc.
In the present invention, in electric flocculation treatment process, adopt direct supply or action of low-voltage pulse Energy control electrode.
In the present invention, in electric flocculation treatment process, adopt the voltage of direct supply or action of low-voltage pulse Energy control often pair of electrode to be 10 ~ 20V, such as 10V, 11V, 12V, 13V, 14V, 15V, 16V, 17V, 18V, 19V or 20V etc., be preferably 10 ~ 12V.
In the present invention, the current density in electric flocculation treatment process on battery lead plate is 3 ~ 10mA/cm
2, such as 3mA/cm
2, 4mA/cm
2, 5mA/cm
2, 6mA/cm
2, 7mA/cm
2, 8mA/cm
2, 9mA/cm
2or 10mA/cm
2deng, be preferably 4 ~ 8mA/cm
2.
In the present invention, in electric flocculation treatment process, interelectrode distance is 10 ~ 30mm, such as 10mm, 13mm, 15mm, 17mm, 20mm, 23mm, 25mm, 27mm or 30mm etc., is preferably 10 ~ 20mm.
In the present invention, in electricity flocculation treatment process, electrode is the combination of any one or any two kinds in aluminium electrode, iron electrode or zinc electrode, described combination typical case but limiting examples have: the combination of aluminium electrode and iron electrode, the combination of iron electrode and zinc electrode, the combination etc. of aluminium electrode and zinc electrode.
Preferably, in electric flocculation treatment process on electrode with circular hole; The present invention adopts the battery lead plate of band circular hole to contribute to the stable of reaction solution and flocculation sediment.
Preferably, number >=2 of the circular hole in electric flocculation treatment process on electrode, such as 2,4,6,8,10,20,25,30,40,50 or 60 and more.
Preferably, the circular hole in electric flocculation treatment process on electrode is evenly arranged on battery lead plate;
Preferably, the diameter of the circular hole in electric flocculation treatment process on electrode is 0.5 ~ 2cm, such as 0.5cm, 0.7cm, 1cm, 1.3cm, 1.5cm, 1.7cm or 2cm, is preferably 1cm.
In the present invention, described heavy metal in waste water concentration is 0.01 ~ 10mg/L, such as 0.01mg/L, 0.05mg/L, 0.1mg/L, 0.5mg/L, 1mg/L, 1.5mg/L, 2mg/L, 3mg/L, 4mg/L, 5mg/L, 6mg/L, 7mg/L, 8mg/L, 9mg/L or 10mg/L etc.
In the present invention, described settling agent is the combination of any one or at least two kinds in polyacrylamide, hydrocarbylamino dithio formate, disodium ethylene diamine tetraacetate, nitrilotriacetic acid or diethylene triaminepentaacetic acid(DTPA), described combination typical case but limiting examples have: the combination of polyacrylamide and hydrocarbylamino dithio formate, the combination of hydrocarbylamino dithio formate and disodium ethylene diamine tetraacetate, the combination of nitrilotriacetic acid and diethylene triaminepentaacetic acid(DTPA), polyacrylamide, the combination of hydrocarbylamino dithio formate and disodium ethylene diamine tetraacetate, hydrocarbylamino dithio formate, disodium ethylene diamine tetraacetate, the combination of nitrilotriacetic acid and diethylene triaminepentaacetic acid(DTPA), polyacrylamide, hydrocarbylamino dithio formate, disodium ethylene diamine tetraacetate, the combination etc. of nitrilotriacetic acid and diethylene triaminepentaacetic acid(DTPA).There is coagulation in the macromole that the settling agent added in the present invention contributes to the colloidal structure formed in electric flocculation process, it also has the effect catching heavy metal and reaction flocculation sediment completely simultaneously, flocculates work in coordination with removal heavy metal with electrochemistry.
Preferably, the add-on of described settling agent is 1 ~ 10mg/L, such as 1mg/L, 2mg/L, 3mg/L, 4mg/L, 5mg/L, 6mg/L, 7mg/L, 8mg/L, 9mg/L or 10mg/L etc., is preferably 3 ~ 8mg/L; When the consumption of settling agent is lower than 1mg/L, heavy metal in waste water process can be made incomplete; When the consumption of settling agent makes higher than 10mg/L, precipitation agent may be caused excessive and the complexity that waste component is become.
The method of a kind of electricity flocculation-chemical precipitation process heavy metal wastewater thereby of the present invention, comprise the following steps: the pH value regulating waste water is 4 ~ 9, electric flocculation treatment 30 ~ 60min is carried out in electric flocculation reactor, the voltage wherein adopting direct supply or action of low-voltage pulse Energy control often pair of electrode is 10 ~ 20V, and adjustment current density is 3 ~ 10mA/cm
2interelectrode distance is 10 ~ 30mm, electrode is the combination of any one or any two kinds in aluminium electrode, iron electrode or zinc electrode, with the circular hole of evenly arrangement on electrode, then the combination of any one or at least two kinds is added in settling agent polyacrylamide, hydrocarbylamino dithio formate, disodium ethylene diamine tetraacetate, nitrilotriacetic acid or diethylene triaminepentaacetic acid(DTPA), the add-on of settling agent is 1 ~ 10mg/L, water outlet after sedimentation 10 ~ 30min.
First the method for the invention carries out electricity flocculation to the heavy metal wastewater thereby containing micro heavy ion, the ion hydrolysis that electrolysis produces produces a large amount of polyol and reacts with the heavy metal ion of trace, to adsorb and chelating etc. is done in order to the most heavy metal ion of enrichment, then by adding settling agent, further enriching heavy metal ion, flocculates with electricity and acts synergistically; The flocs unit of gained starts precipitation, finally makes gained water outlet meet emission standard.
Now set forth for the mechanism of aluminium electrode to described method, the mechanism in the present invention when electrode adopts the combination of in iron electrode, zinc electrode and aluminium electrode, iron electrode or zinc electrode at least two kinds is identical with adopting the mechanism of aluminium electrode, therefore repeats no more.
When adopting Al anode, the Al that electrolysis produces
3+rapidly with hydrated ion Al (H in water
2o)
6 3+form exist, subsequently very soon hydrolysis lose H
+, form a series of mononuclear complex, as Al (H
2o)
5oH
2+, Al (H
2o)
4(OH)
2+with Al (H
2o)
3(OH)
3deng.Because oxyaluminum ion increases gradually, remain a large amount of lone-pair electron, hydroxyl coordinate bond unsaturation, therefore oxyaluminum ion can be polymerized to hydroxyl bridge crosslinking structure gradually with another aluminum ion, form two hydroxyl bond bridges, thus slowly aggregate into the multinuclear polymer network polymer [Al of rich surface hydroxyl by the complex compound of mononuclear aluminum
m(H
2o)
x(OH)
n]
(3m-n), and finally change into unbodied [Al (OH)
3]
nflocculation agent.
A.Sarpola etc. confirm in reaction system have more than 80 kinds of unit price aluminium core positively charged ion (Al by mass spectroscopy
2 ~ 13) and 19 kinds of multivalence aluminium core positively charged ion (Al
10 ~ 27) exist; In addition, also found more than 45 kinds of unit price aluminium core negatively charged ion (Al
1 ~ 12) and 9 kinds of multivalence aluminium core negatively charged ion (Al
10 ~ 32).These hydroxo complexes can react with heavy metal ion, by effects such as adsorption-condensations, enrichment is carried out to the heavy metal ion in waste water, according to negative positive and negative positive form constantly in conjunction with heavy metal ion, thus form the macromole with colloidal structure, then under the effect of settling agent, there is coagulation completely, reach the object of removal heavy metal.
In addition, the settling agent added also has the effect catching heavy metal and reaction flocculation sediment, flocculates work in coordination with removal heavy metal with electrochemistry.Simultaneously charged pollutent swimming in the electric field, its Partial charge is neutralized by electrode and impels its de-steady coagulation, realizes good solid-liquid separation effect.Its concentration is made to reach discharging standards.
For aluminium electrode, principal reaction formula involved in the present invention is as follows:
Anode: Al (s)-3e
-=Al
3+(aq)
Negative electrode: M
z+(metal ion)+ze
-=M
2H
2O+O
2+4e
-＝4OH
-
Enrichment, flocculation and precipitin reaction:
mAl
3+(aq)+xH
2O+nOH
-→[Al
m(H
2O)
x(OH)
n]
3m-n
[Al
m(H
2o)
x(OH)
n]
3m-n+ yM
z+→ { [Al
m(H
2o)
x(OH)
n]
3m-nm
y]
3m-n+yx(colloid)
TDC+M → TDC-M (S) (taking TDC as settling agent)
{[Al
m(H
2O)
x(OH)
n]
3m-nM
y]}
3m-n+yx+TDC-M→{{[Al
m(H
2O)
x(OH)
n]
3m-nM
y]}
3m-n+yxTDC-M}
Compared with prior art, the present invention has following beneficial effect:
(1) the electrochemistry flocculation in the present invention in electric flocculation reaction, air supporting and flocculation sediment and the follow-up depositing technology adding settling agent all concentrate in a reactor and complete, and equipment is simple, saves fixed investment and floor space.
(2) adopt the processing mode adding settling agent to catch the micro heavy in waste water in the present invention after electric flocculation reaction, the heavy metal wastewater thereby of heavy metal concentration very low (heavy metal concentration is 0.01 ~ 10mg/L) can be processed; Electrochemistry flocculation and settling agent synergy remove the heavy metal in waste water, and processing efficiency is high, makes the concentration of heavy metal ion in water outlet, as the concentration of nickel, lead, cadmium, chromium and mercury ion, is all low to moderate below 0.05mg/L and meets qualified discharge requirement.
(3) battery lead plate in the present invention adopts the battery lead plate of band circular hole, contributes to the stable of reaction solution and flocculation sediment; Meanwhile, what the present invention adopted is the voltage of periodic reverse, and two-plate can use simultaneously, can prevent electrode passivation.
(4) electrochemistry flocculation and settling agent conbined usage in the present invention, not only can reduce current consumption but also can reduce the consumption of chemical agent, running cost is lower.
Embodiment
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment only understands the present invention for helping, and should not be considered as concrete restriction of the present invention.
The present invention is directed to the heavy metal wastewater thereby containing micro heavy ion, adopt electrochemistry flocculation to carry out enriching heavy metal ion in conjunction with the mode of settling agent, make heavy metal ion content in water outlet lower, meet qualified discharge standard.
Embodiment 1:
In pending heavy metal wastewater thereby, wherein nickel, lead, cadmium, chromium and ion concentration of mercury are 10mg/L.
Get pending heavy metal wastewater thereby, adjust ph is 5, adopts direct supply, and arrange the voltage 15V that electricity flocculation parameter is often pair of electrode, current density is 5mA/cm
2, polar plate spacing is 20mm, and electrode adopts the fine aluminium pole plate of band circular hole, carries out electric flocculation treatment 30min; After electricity flocculation reaction 30min, in reaction solution, add the settling agent hydrocarbylamino dithio formate (DTC salt) of 4mg/L, continue sedimentation 10min and complete reaction.
After electricity flocculation reaction completes, nickel, lead, cadmium, chromium and the mercury concentration measured in water outlet is respectively 0.05mg/L, 0.025mg/L, 0.035mg/L, 0.05mg/L and 0.01mg/L.
Embodiment 2:
In pending heavy metal wastewater thereby, wherein nickel, lead, cadmium, chromium and ion concentration of mercury are 5mg/L.
Get pending heavy metal wastewater thereby, adjust ph is 7, adopts action of low-voltage pulse power supply, and arrange the voltage 20V that electricity flocculation parameter is often pair of electrode, current density is 8mA/cm
2, polar plate spacing is 15mm, and electrode adopts the fine aluminium pole plate of band circular hole, carries out electric flocculation treatment 40min; After electricity flocculation reaction, in reaction solution, add the settling agent hydrocarbylamino dithio formate (DTC salt) of 5mg/L, continue sedimentation 20min and complete reaction.
After electricity flocculation reaction completes, nickel, lead, cadmium, chromium and the ion concentration of mercury measured in water outlet is respectively 0.025mg/L, 0.04mg/L, 0.05mg/L, 0.01mg/L and 0.01mg/L.
Embodiment 3:
In pending heavy metal wastewater thereby, wherein nickel, lead, cadmium, chromium and mercury concentration are 8mg/L.
Get pending heavy metal wastewater thereby, adjust ph is 6, adopts action of low-voltage pulse power supply, and arrange the voltage 20V that electricity flocculation parameter is often pair of electrode, current density is 10mA/cm
2, polar plate spacing is 10mm, and electrode adopts the fine aluminium pole plate of band circular hole, carries out electric flocculation treatment 40min; After electricity flocculation reaction, in reaction solution, add the settling agent hydrocarbylamino dithio formate (DTC salt) of 3mg/L, continue sedimentation 15min and complete reaction.
After electricity flocculation reaction completes, nickel, lead, cadmium, chromium and the ion concentration of mercury measured in water outlet is respectively 0.02mg/L, 0.03mg/L, 0.03mg/L, 0.05mg/L and 0.015mg/L.
Embodiment 4:
In pending heavy metal wastewater thereby, wherein nickel, lead, cadmium, chromium and ion concentration of mercury are 3mg/L.
Get pending heavy metal wastewater thereby, adjust ph is 9, adopts direct supply, and arrange the voltage 10V that electricity flocculation parameter is often pair of electrode, current density is 4mA/cm
2, polar plate spacing is 30mm, and electrode adopts the pure iron pole plate of band circular hole, carries out electric flocculation treatment 60min; After electricity flocculation reaction, in reaction solution, add the settling agent polyacrylamide of 8mg/L, continue sedimentation 30min and complete reaction.
After electricity flocculation reaction completes, the concentration measuring nickel, lead, cadmium, chromium and mercury in water outlet is respectively 0.025mg/L, 0.035g/L, 0.04mg/L, 0.05mg/L and 0.01mg/L.
Embodiment 5:
In pending heavy metal wastewater thereby, wherein nickel, lead, cadmium, chromium and ion concentration of mercury are 1mg/L.
Except regulating pH to be 4, arranging electrode voltage is 12V, and current density is 3mA/cm
2, electrode adopts the pure zincode plate of band circular hole, and settling agent is disodium ethylene diamine tetraacetate, and settling agent consumption is outside 10mg/L, and other steps are all in the same manner as in Example 1.
After electricity flocculation reaction completes, measure nickel, lead, cadmium, chromium and mercury concentration in water outlet and be respectively 0.015mg/L, 0.02mg/L, 0.02mg/L, 0.04mg/L and 0.005mg/L.
Embodiment 6:
In pending heavy metal wastewater thereby, wherein nickel, lead, cadmium, chromium and mercury concentration are 1mg/L.
Except the mixture that settling agent is polyacrylamide and hydrocarbylamino dithio formate, settling agent consumption is outside 1mg/L, and other steps are all in the same manner as in Example 1.
After electricity flocculation reaction completes, the concentration measuring nickel, lead, cadmium, chromium and mercury in water outlet is respectively 0.025mg/L, 0.012mg/L, 0.045mg/L, 0.050mg/L and 0.005mg/L.
Comparative example 1:
Except not adding except settling agent, other steps are all in the same manner as in Example 1.
After electricity flocculation reaction completes, measure nickel, lead, cadmium, chromium and mercury concentration in water outlet and be respectively 1.5mg/L, 1.2mg/L, 0.5mg/L, 1.0mg/L and 0.1mg/L.
Comparative example 2:
Except the consumption of settling agent is lower than except 1mg/L, other steps are all identical with example 1.
After electricity flocculation reaction completes, measure nickel, lead, cadmium, chromium and mercury concentration in water outlet and be respectively 2.3mg/L, 1.5mg/L, 0.5mg/L, 0.8mg/L and 0.15mg/L.
Comparative example 3:
Except the consumption of settling agent is higher than except 10mg/L, other steps are all identical with example 1.
After electricity flocculation reaction completes, measure nickel, lead, cadmium, chromium and mercury concentration in water outlet and be respectively 0.03mg/L, 0.04mg/L, 0.03mg/L, 0.10mg/L and 0.005mg/L.
Comparative example 4:
Except electrode is not with except the fine aluminium pole plate of circular hole, other steps are all identical with example 1.
After electricity flocculation reaction completes, measure nickel, lead, cadmium, chromium and mercury concentration in water outlet and be respectively 0.23mg/L, 0.10mg/L, 0.8mg/L, 0.2mg/L and 0.15mg/L.
The result of integrated embodiment 1-6 and comparative example 1-4 can be found out, adopt the processing mode adding settling agent to catch the micro heavy in waste water in the present invention after electric flocculation reaction, the heavy metal wastewater thereby of heavy metal concentration very low (heavy metal concentration is 0.01 ~ 10mg/L) can be processed; Electrochemistry flocculation and settling agent synergy remove the heavy metal in waste water, and processing efficiency is high, makes the concentration of heavy metal ion in water outlet, as the concentration of nickel, lead, cadmium, chromium and mercury ion, all be low to moderate below 0.05mg/L, meet qualified discharge requirement, reduce running cost; Battery lead plate in the present invention adopts the battery lead plate of band circular hole, contributes to the stable of reaction solution and flocculation sediment; The present invention adopts the voltage of periodic reverse, and two-plate can use simultaneously, can prevent electrode passivation; Electrochemistry flocculation in the present invention in electric flocculation reaction, air supporting and flocculation sediment and the follow-up depositing technology adding settling agent all concentrate in a reactor and complete, and equipment is simple, saves fixed investment and floor space.
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (10)
1. the method for an electricity flocculation-chemical precipitation process heavy metal wastewater thereby, it is characterized in that, said method comprising the steps of: regulate the pH value of waste water, in electric flocculation reactor, carry out electric flocculation treatment 30 ~ 60min, then add water outlet after settling agent sedimentation 10 ~ 30min.
2. method according to claim 1, is characterized in that, the pH regulating waste water is 4 ~ 9.
3. method according to claim 1 and 2, is characterized in that, adopts direct supply or action of low-voltage pulse Energy control electrode in electric flocculation treatment process.
4. the method according to any one of claim 1-3, is characterized in that, adopts the voltage of direct supply or action of low-voltage pulse Energy control often pair of electrode to be 10 ~ 20V in electric flocculation treatment process, is preferably 10 ~ 12V.
5. the method according to any one of claim 1-4, is characterized in that, the current density in electric flocculation treatment process on battery lead plate is 3 ~ 10mA/cm
2, be preferably 4 ~ 8mA/cm
2.
6. the method according to any one of claim 1-5, is characterized in that, in electric flocculation treatment process, interelectrode distance is 10 ~ 30mm, is preferably 10 ~ 20mm.
7. the method according to any one of claim 1-6, is characterized in that, in electric flocculation treatment process electrode be in aluminium electrode, iron electrode or zinc electrode any one;
Preferably, in electric flocculation treatment process on electrode with circular hole;
Preferably, number >=2 of the circular hole in electric flocculation treatment process on electrode;
Preferably, the circular hole in electric flocculation treatment process on electrode is evenly arranged on battery lead plate;
Preferably, the diameter of the circular hole in electric flocculation treatment process on electrode is 0.5 ~ 2cm, is preferably 1cm.
8. the method according to any one of claim 1-7, is characterized in that, described heavy metal in waste water concentration is 0.01 ~ 10mg/L.
9. the method according to any one of claim 1-8, it is characterized in that, described settling agent is the combination of any one or at least two kinds in polyacrylamide, hydrocarbylamino dithio formate, disodium ethylene diamine tetraacetate, nitrilotriacetic acid or diethylene triaminepentaacetic acid(DTPA);
Preferably, the add-on of described settling agent is 1 ~ 10mg/L, is preferably 3 ~ 8mg/L.
10. the method according to any one of claim 1-9, it is characterized in that, said method comprising the steps of: the pH value regulating waste water is 4 ~ 9, electric flocculation treatment 30 ~ 60min is carried out in electric flocculation reactor, the voltage wherein adopting direct supply or action of low-voltage pulse Energy control often pair of electrode is 10 ~ 20V, and adjustment current density is 3 ~ 10mA/cm
2interelectrode distance is 10 ~ 30mm, electrode is the combination of any one or any two kinds in aluminium electrode, iron electrode or zinc electrode, with the circular hole of evenly arrangement on electrode, then the combination of any one or at least two kinds is added in settling agent polyacrylamide, hydrocarbylamino dithio formate, disodium ethylene diamine tetraacetate, nitrilotriacetic acid or diethylene triaminepentaacetic acid(DTPA), the add-on of settling agent is 1 ~ 10mg/L, water outlet after sedimentation 10 ~ 30min.
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| CN106045138A (en) * | 2016-05-20 | 2016-10-26 | 北京矿冶研究总院 | Soluble magnesium-aluminum electrode and heavy metal wastewater treatment method using same |
| CN109179800A (en) * | 2018-08-31 | 2019-01-11 | 湖南中冶艾迪环保资源开发有限公司 | A method of removal rare earth extraction heavy metal in waste water |
| CN109354134A (en) * | 2018-10-24 | 2019-02-19 | 东莞市三人行环境科技有限公司 | A kind of method of electric flocculation removal anodic oxidation Determinating Chromaticity of Dyeing Effluent |
| CN110357318A (en) * | 2019-07-05 | 2019-10-22 | 中铝广西国盛稀土开发有限公司 | A kind of rare-earth industry acid waste water heavy metal processing method |
| CN115159743A (en) * | 2022-07-15 | 2022-10-11 | 张彧 | Control method of cleaning equipment and related device |
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| CN106045138A (en) * | 2016-05-20 | 2016-10-26 | 北京矿冶研究总院 | Soluble magnesium-aluminum electrode and heavy metal wastewater treatment method using same |
| CN106045138B (en) * | 2016-05-20 | 2019-04-19 | 北京矿冶研究总院 | Soluble magnesium-aluminum electrode and heavy metal wastewater treatment method using same |
| CN109179800A (en) * | 2018-08-31 | 2019-01-11 | 湖南中冶艾迪环保资源开发有限公司 | A method of removal rare earth extraction heavy metal in waste water |
| CN109354134A (en) * | 2018-10-24 | 2019-02-19 | 东莞市三人行环境科技有限公司 | A kind of method of electric flocculation removal anodic oxidation Determinating Chromaticity of Dyeing Effluent |
| CN109354134B (en) * | 2018-10-24 | 2021-10-08 | 东莞市三人行环境科技有限公司 | Method for removing chroma of anodic oxidation dyeing wastewater through electric flocculation |
| CN110357318A (en) * | 2019-07-05 | 2019-10-22 | 中铝广西国盛稀土开发有限公司 | A kind of rare-earth industry acid waste water heavy metal processing method |
| CN110357318B (en) * | 2019-07-05 | 2024-05-10 | 中铝广西国盛稀土开发有限公司 | Heavy metal treatment method for rare earth industrial acid wastewater |
| CN115159743A (en) * | 2022-07-15 | 2022-10-11 | 张彧 | Control method of cleaning equipment and related device |
| CN115252703A (en) * | 2022-08-23 | 2022-11-01 | 一力制药股份有限公司 | Children's Yinlian granules and preparation method thereof |
| CN115252703B (en) * | 2022-08-23 | 2023-08-18 | 一力制药股份有限公司 | Children's Yinlian granule and preparation method thereof |
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Application publication date: 20151118 |