CN103395866A - Water treatment process for segmentation and constant current control of electric flocculation - Google Patents
Water treatment process for segmentation and constant current control of electric flocculation Download PDFInfo
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- CN103395866A CN103395866A CN2013102739916A CN201310273991A CN103395866A CN 103395866 A CN103395866 A CN 103395866A CN 2013102739916 A CN2013102739916 A CN 2013102739916A CN 201310273991 A CN201310273991 A CN 201310273991A CN 103395866 A CN103395866 A CN 103395866A
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Abstract
The invention discloses a water treatment process for segmentation constant current control of electric flocculation, wherein the segmentation constant current control comprises: in an early stage of reaction, setting high average current density in an intermittent electric flocculation system; in a mid-stage of reaction, setting moderate average current density; and in a later stage, setting low average current density. Compared with current water treatment technology for constant current intermittent electric flocculation control, the water treatment process provided by the invention has advantages that a high separating rate can be implemented under low average current density in an electric flocculation process for segmentation constant current control, and water treatment cost per ton is reduced in the electric flocculation process.
Description
Technical field
The invention belongs to sewage treatment area, be specifically related to a kind of multi-stage constant current and control electricity flocculation water technology.
Background technology
In recent years, in heavy metal and hardly degraded organic substance field of waste water treatment, the application of electric flocculation technique is more and more.Electric flocculation technique both can be processed heavy metal or hardly degraded organic substance waste water fast and efficiently.In electric flocculation process, generally can produce four kinds of effects, i.e. electrolytic oxidation, electrolytic reduction, electrolytic flocculation and electrofloatation.
Electrolytic oxidation: the oxygenizement in electrolytic process can be divided into direct oxidation, and namely pollutent directly loses electronics and oxidation occurs at anode; Utilize the lower negatively charged ion of electrode potential in solution, for example OH
-, Cl
-Lose electronics at anode and generate the active substance Cl of new stronger oxygenant
2Deng.Utilize these active substances to make pollutent lose electronics, its oxygenolysis, to reduce the BOD in stoste
5, COD, ammonia nitrogen etc.
Electrolytic reduction: the reductive action in electrolytic process also can be divided into two classes.One class is direct-reduction, and namely pollutent directly obtains electronics and reductive action occurs on negative electrode.Another kind of is indirect reduction, and at first the positively charged ion in pollutent obtains electronics at negative electrode, make in ionogen high price or at a low price metallic cation obtain electronics at negative electrode and directly be reduced to positively charged ion or precipitated metal at a low price.
Electrolytic flocculation: after soluble anode passes to direct current, after anode loses electronics, form metallic cation, with the OH in solution
-Generate metal hydroxides colloid flocculation agent, adsorptive power is extremely strong, and the pollution substance sorption-coprecipitation in waste water is removed.
Electrofloatation: electrofloatation is that waste water is carried out electrolysis, when voltage reaches the decomposition voltage of water, separates out respectively hydrogen and oxygen on negative electrode and anode.Bubble size is very little, and dispersity is high, as carrier, adheres to the suspended solids in water and floats, and is easy to contaminants removal like this.Electrofloatation both can have been removed the hydrophobic contaminant in waste water, also can remove the wetting ability pollutent in waste water.
The ton water cost of electricity flocculation water technology comprises power consumption and export license, and wherein power consumption accounts for major portion.The optimization of electricity flocculation process mainly comprises the optimization of energy consumption and the optimization of removing efficiency.The main technique measure of energy optimization has the cell construction of improvement, improves the wastewater feed parameter, improves power technology etc.
Summary of the invention
Goal of the invention: the purpose of this invention is to provide a kind of segmented current and control electricity flocculation water technology, its can be under the prerequisite of efficient and less energy-consumption heavy-metal ion removal and organic waste water.
Technical scheme: in order to address the above problem, technical scheme of the present invention is to provide a kind of multi-stage constant current and controls electricity flocculation water technology, described multi-stage constant current is controlled and is referred to,, in the early stage of reaction, is intermittently setting higher average current density in electric flocculation system; , in the mid-term of reaction, set medium average current density; , in the later stage of reaction, set lower average current density.
Preferably, described intermittence, the electricity flocculation system was to carry out by action of low-voltage pulse power supply or direct supply the system that multi-stage constant current is controlled, and on the battery lead plate on described intermittence electricity flocculation system, the overall average current density is 1 ~ 10 mA/cm
2, interelectrode distance is 3 ~ 20mm, electrolysis time is 20 ~ 90min.
Preferably, refer to front 1/3 section of total reaction time the early stage of described reaction, refer to 1/3 ~ 2/3 section of the centre of total reaction time the mid-term of described reaction, the later stage of described reaction refers to rear 1/3 section of total reaction time.
Preferably, described higher average current density refers to account for 130 ~ 180% of overall average current density; Described medium average current density refers to account for 80 ~ 120% of overall average current density; Described lower average current density refers to account for 20% ~ 60% of overall average current density.
Before entering intermittently electric flocculation system processing, for the organic wastewater of difficult degradation, its influent COD is 500 ~ 50000mg/L, and for effluent containing heavy metal ions, the concentration of heavy metal ion of its water inlet is 50 ~ 1000mg/L.
Before entering intermittently electric flocculation system processing, regulating wastewater pH is 4 ~ 6.5, and the adjusting specific conductivity is 300 ~ 7000us/cm.
Beneficial effect: in electric flocculation reaction in earlier stage, electrolyzer pollutent (as heavy metal ion and organism) concentration is higher, need a large amount of absorption flcos to adsorb pollutent, therefore in reaction in earlier stage, need higher current density to produce more absorption flco.In the mid-term of electric flocculation reaction, a large amount of absorption flcos are adsorbing pollutent, and the Pollutant levels in solution reduce gradually, and the absorption flco that only need the current density of medium tenacity to produce moderate this moment gets final product.In the later stage of electric flocculation reaction, quilt wadding absorption of most of pollutent in solution, in solution, Pollutant levels are about 0.5% ~ 5% of starting point concentration, later stage be mainly by the flco flco of high-specific surface area by net catch, roll up sweep, separation that the adsorption bridging effect realizes pollutent, only need this moment a small amount of new life to adsorb flco and get final product.Therefore, in the electric flocculation process later stage, only need less current density to get final product.
The present invention compares with existing continuous current electricity at intermittence flocculation water technology, and its remarkable advantage is that the electric flocculation process that the segmentation continuous current is controlled can be realized higher separation rate under lower average current density, has significantly reduced electric flocculation process ton cost of water treatment.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1:
Certain mixes dyeing waste water, and influent COD is 5000mg/L, and colourity is 1150 times, and regulating waste water ph is 5, and regulating specific conductivity is 600 us/cm, enters intermittently electric flocculation system and processes, and interelectrode distance is 7mm, and it is 4mA/cm that the overall average current density is set
2The overall cell reaction time is 60min, is controlled average current density on the multi-stage constant current controlling plate by the direct supply multi-stage constant current.At front 1/3 section of total reaction time, average current density is set as 180 % of overall average current density, i.e. 7.2 mA/cm
2In the centre of total reaction time 1/3 ~ 2/3 section, average current density is set as 80% of overall average current density, i.e. 3.2 A/cm
2At rear 1/3 section of total reaction time, average current density is set as 40% of overall average current density, i.e. 1.6 A/cm
2The complete rear waste water COD of electricity flocculation reaction is reduced to 385mg/L, and percent of decolourization reaches 93%.
Comparative Examples: the waste water of above-mentioned same kind, concentration, pH value,, through electric flocculation treatment, adopt constant current power supply, the current density in whole reaction times is set as steady state value, i.e. 4mA/cm
2, electrolysis time is consistent with above-described embodiment 1, and the complete rear waste water COD of electric flocculation reaction is reduced to 434mg/L, and percent of decolourization reaches 82%.
Embodiment 2:
Certain pharmacy wastewater, influent COD are 3000mg/L, and regulating waste water ph is 5, and regulating specific conductivity is 850 us/cm, enter intermittently electric flocculation system and process, and interelectrode distance is 3.5mm, and it is 3mA/cm that the overall average current density is set
2The overall cell reaction time is 40min, is controlled average current density on the multi-stage constant current controlling plate by the direct supply multi-stage constant current.At front 1/3 section of total reaction time, average current density is set as 140% of overall average current density, i.e. 4.2 mA/cm
2In the centre of total reaction time 1/3 ~ 2/3 section, average current density is set as 120% of overall average current density, i.e. 3.6mA/cm
2At rear 1/3 section of total reaction time, average current density is set as 40% of overall average current density, i.e. 1.2m A/cm
2The complete rear waste water COD of electricity flocculation reaction is reduced to 191mg/L.
Comparative Examples: the waste water of above-mentioned same kind, concentration, pH value,, through electric flocculation treatment, adopt constant current power supply, the current density in whole reaction times is set as steady state value, i.e. 3mA/cm
2, electrolysis time is consistent with above-described embodiment 1, and the complete rear waste water COD of electric flocculation reaction is reduced to 259mg/L.
Embodiment 3:
Certain contains the cobalt effluent containing heavy metal ions, and the water inlet concentration of cobalt ions is 200mg/L, and regulating waste water ph is 5.5, and regulating specific conductivity is 700 us/cm, enters intermittently electric flocculation system and processes, and interelectrode distance is 5mm, and it is 5mA/cm that the overall average current density is set
2The overall cell reaction time is 60min, is controlled average current density on the multi-stage constant current controlling plate by the direct supply multi-stage constant current.At front 1/3 section of total reaction time, average current density is set as 150 % of overall average current density, i.e. 7.5mA/cm
2In the centre of total reaction time 1/3 ~ 2/3 section, average current density is set as 100% of overall average current density, i.e. 5A/cm
2At rear 1/3 section of total reaction time, average current density is set as 50% of overall average current density, i.e. 2.5A/cm
2The complete rear waste water concentration of cobalt ions of electricity flocculation reaction is reduced to 11.8mg/L, and clearance reaches 94.1%.
Comparative Examples: the waste water of above-mentioned same kind, concentration, pH value,, through electric flocculation treatment, adopt constant current power supply, the current density in whole reaction times is set as steady state value, i.e. 5mA/cm
2, electrolysis time is consistent with above-described embodiment 1, and the complete rear waste water concentration of cobalt ions of electric flocculation reaction is reduced to 24.8mg/L, and clearance reaches 87.6%.
Embodiment 4
Certain nickeliferous effluent containing heavy metal ions, the water inlet nickel ion concentration is 100mg/L, and regulating waste water ph is 4, and regulating specific conductivity is 500 us/cm, enters intermittently electric flocculation system and processes, and interelectrode distance is 3mm, it is 4mA/cm that the overall average current density is set
2The overall cell reaction time is 60min, is controlled average current density on the multi-stage constant current controlling plate by the direct supply multi-stage constant current.At front 1/3 section of total reaction time, average current density is set as 140 % of overall average current density, i.e. 5.6mA/cm
2In the centre of total reaction time 1/3 ~ 2/3 section, average current density is set as 120% of overall average current density, i.e. 4.8mA/cm
2At rear 1/3 section of total reaction time, average current density is set as 40% of overall average current density, i.e. 1.6A/cm
2The complete rear nickel-containing wastewater ionic concn of electricity flocculation reaction is reduced to 3.6mg/L, and clearance reaches 96.4%.
Comparative Examples: the waste water of above-mentioned same kind, concentration, pH value,, through electric flocculation treatment, adopt constant current power supply, the current density in whole reaction times is set as steady state value, i.e. 4mA/cm
2, electrolysis time is consistent with above-described embodiment 1, and the complete rear nickel-containing wastewater ionic concn of electric flocculation reaction is reduced to 8.7mg/L, and clearance reaches 91.3%.
Embodiment 5
Certain Combination waste water, influent COD are 500mg/L, and colourity is 1150 times, and regulating waste water ph is 6.5, and regulating specific conductivity is 300 us/cm, enter intermittently electric flocculation system and process, and interelectrode distance is 20mm, and it is 1mA/cm that the overall average current density is set
2The overall cell reaction time is 20min, is controlled average current density on the multi-stage constant current controlling plate by the direct supply multi-stage constant current.At front 1/3 section of total reaction time, average current density is set as 130 % of overall average current density, i.e. 1.3mA/cm
2In the centre of total reaction time 1/3 ~ 2/3 section, average current density is set as 80% of overall average current density, i.e. 0.8A/cm
2At rear 1/3 section of total reaction time, average current density is set as 20% of overall average current density, i.e. 0.2 A/cm
2The complete rear waste water COD of electricity flocculation reaction is reduced to 185mg/L, and percent of decolourization reaches 94%.
Comparative Examples: the waste water of above-mentioned same kind, concentration, pH value,, through electric flocculation treatment, adopt constant current power supply, the current density in whole reaction times is set as steady state value, i.e. 10mA/cm
2, electrolysis time is consistent with above-described embodiment 5, and the complete rear waste water COD of electric flocculation reaction is reduced to 234mg/L, and percent of decolourization reaches 72%.
Embodiment 6
Certain nickeliferous effluent containing heavy metal ions, the water inlet nickel ion concentration is 1000mg/L, and regulating waste water ph is 4, and the adjusting specific conductivity is 7000us/cm, enters intermittently electric flocculation system and processes, and interelectrode distance is 3mm, it is 10mA/cm that the overall average current density is set
2The overall cell reaction time is 90min, is controlled average current density on the multi-stage constant current controlling plate by the direct supply multi-stage constant current.At front 1/3 section of total reaction time, average current density is set as overall average current density 140 %, i.e. 14mA/cm
2In the centre of total reaction time 1/3 ~ 2/3 section, average current density is set as 120% of overall average current density, i.e. 12mA/cm
2At rear 1/3 section of total reaction time, average current density is set as 40% of overall average current density, i.e. 4A/cm
2The complete rear nickel-containing wastewater ionic concn of electricity flocculation reaction is reduced to 20mg/L, and clearance reaches 98%.
Comparative Examples: the waste water of above-mentioned same kind, concentration, pH value,, through electric flocculation treatment, adopt constant current power supply, the current density in whole reaction times is set as steady state value, i.e. 10mA/cm
2, electrolysis time is consistent with above-described embodiment 1, and the complete rear waste water concentration of cobalt ions of electric flocculation reaction is reduced to 90mg/L, and clearance reaches 91%.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a multi-stage constant current is controlled electricity flocculation water technology, and it is characterized in that: described multi-stage constant current is controlled and referred to,, in the early stage of reaction, is intermittently setting higher average current density in electric flocculation system; , in the mid-term of reaction, set medium average current density; , in the later stage of reaction, set lower average current density.
2. multi-stage constant current according to claim 1 is controlled electricity flocculation water technology, it is characterized in that: described intermittence, the electricity flocculation system was to carry out by action of low-voltage pulse power supply or direct supply the system that multi-stage constant current is controlled, and on the battery lead plate on described intermittence electricity flocculation system, the overall average current density is 1 ~ 10 mA/cm
2, interelectrode distance is 3 ~ 20mm, electrolysis time is 20 ~ 90min.
3. multi-stage constant current according to claim 1 is controlled electricity flocculation water technology, it is characterized in that: refer to front 1/3 section of total reaction time the early stage of described reaction, refer to 1/3 ~ 2/3 section of the centre of total reaction time the mid-term of described reaction, the later stage of described reaction refers to rear 1/3 section of total reaction time.
4. multi-stage constant current according to claim 1 is controlled electricity flocculation water technology, and it is characterized in that: described higher average current density refers to account for 130 ~ 180% of overall average current density; Described medium average current density refers to account for 80 ~ 120% of overall average current density; Described lower average current density refers to account for 20% ~ 60% of overall average current density.
5. multi-stage constant current according to claim 1 is controlled electricity flocculation water technology, it is characterized in that: before entering intermittently electric flocculation system processing, organic wastewater for difficult degradation, its influent COD is 500 ~ 50000mg/L, for effluent containing heavy metal ions, the concentration of heavy metal ion of its water inlet is 50 ~ 1000mg/L.
6. multi-stage constant current according to claim 1 is controlled electricity flocculation water technology, it is characterized in that: before entering intermittently electric flocculation system processing, regulating wastewater pH is 4 ~ 6.5, and the adjusting specific conductivity is 300 ~ 7000us/cm.
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Cited By (2)
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| CN103979646A (en) * | 2014-06-04 | 2014-08-13 | 江苏科技大学 | Continuous electric flocculation water treatment method for dosing along process |
| CN104261519A (en) * | 2014-10-08 | 2015-01-07 | 深圳大学 | Method for removing perfluoro organic pollutants in waste water |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103979646A (en) * | 2014-06-04 | 2014-08-13 | 江苏科技大学 | Continuous electric flocculation water treatment method for dosing along process |
| CN103979646B (en) * | 2014-06-04 | 2015-07-15 | 江苏科技大学 | Continuous electric flocculation water treatment method for dosing along process |
| CN104261519A (en) * | 2014-10-08 | 2015-01-07 | 深圳大学 | Method for removing perfluoro organic pollutants in waste water |
| CN104261519B (en) * | 2014-10-08 | 2016-01-13 | 深圳大学 | A kind of method removing perfluor organic pollutant in waste water |
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Application publication date: 20131120 |