CN102241449B - Method for treating electroplating wastewater based on low voltage pulsed electric flocculation technology - Google Patents
Method for treating electroplating wastewater based on low voltage pulsed electric flocculation technology Download PDFInfo
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- CN102241449B CN102241449B CN 201110158042 CN201110158042A CN102241449B CN 102241449 B CN102241449 B CN 102241449B CN 201110158042 CN201110158042 CN 201110158042 CN 201110158042 A CN201110158042 A CN 201110158042A CN 102241449 B CN102241449 B CN 102241449B
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Abstract
The invention discloses a method for treating electroplating wastewater based on low voltage pulsed electric flocculation technology. The method comprises the following steps: treating electroplating wastewater by pulsed electric flocculation technology, wherein the time for the treatment is 20 min to 60 min, pulse power supply is an industrial-frequency alternating current of 220 V and 50 Hz, output voltage of the pulse power supply is 0 to 36 V, duty ratio is 10% to 90%, output frequency is 100 Hz to 1000 Hz, output current density is 0.5 A/dm<2> to 3.5 A/dm<2>, the anode of the electric flocculation is aluminum electrodes, the cathode is stainless steel electrodes, and the distance between plate electrodes is 1 cm to 10 cm; adding lime into the electroplating wastewater treated by pulsed electric flocculation to adjust the pH value of the wastewater to be 7.4, wherein the weight ratio of lime to the treated wastewater is 1:200 to 1:40; adding diatomite into the solution, wherein the weight ratio of diatomite to the electroplating wastewater treated by pulsed electric flocculation is 1:200, standing the solution for deposition, and discharging or recycling the electroplating wastewater. The method provided in the invention is simple and easy to implement and enables low cost and high efficiency; treated wastewater can be reused or discharged directly.
Description
Technical field
The present invention relates to a kind of method of processing electroplating wastewater, specifically based on the method for the processing electroplating wastewater of low voltage pulsed electric flocculation technology.
Background technology
Plating is wide in industrial highly versatile, use, and nearly all industrial sector has Electroplate Factory.According to statistics, the whole nation is electroplated point and has been developed into nearly 20000, and the consumption of water resources also increases thereupon.Select water 200m every day by average each plating
3Calculate, a whole nation year waste discharge will be above 1,000,000,000 m
3Electroplating wastewater comes from the cleaning process of plating piece more than 90%, the repeating utilization factor of electroplating cleaning water is very low, and the wantonly wasting phenomenon of water is very general.The water quality of electroplating wastewater is complicated, and composition is wayward, and the toxicity such as the heavy metal ion such as the chromium that wherein contains, copper, nickel, good fortune, zinc, gold and silver and prussiate are larger, and some belongs to carcinogenic, teratogenesis, mutagenic highly toxic substance, and is very harmful to the mankind.Therefore the improvement of electroplating wastewater remains the great research topic of world's field of Environment Protection.
The treatment process of electroplating wastewater is a lot of both at home and abroad at present, can be divided into two large classes.One class is to make the heavy metal that is dissolved state in the waste water change insoluble heavy metal compound into, remove from waste water through precipitation or floating upper method, method commonly used has hydroxide precipitation method, sulphide precipitation, ferrite coprecipitation method, oxidation reduction process, ion exchange method, ion floatation method, electrolytic process, membrane electrolysis etc.Another kind of method is to adsorb under the condition that does not change its chemical form, concentrate and separate, and concrete grammar has the methods such as reverse osmosis method, electroosmose process, membrane separation process, evaporation concentration method, absorption method, solvent extration.This two class methods plant efficiency is low, and processing cost is high, and later maintenance is complicated.
Electric flocculation technique has does not need to add medicament, and cost is low, can or seldom not produce secondary pollution, produce the advantages such as sludge quantity is few, but this technology in use easily causes the electrode fouling, reduces processing efficiency, has also increased the maintenance cost of changing electrode simultaneously.
The pulse electro-flocculation technology can effectively be slowed down the electrode fouling, and can save power consumption, when this technology is used for wastewater treatment, the pulse power voltage that adopts is higher (up to 300 ~ 500V), far above the safety voltage of 36V, and electrode is when processing waste water, easily moist, infiltration on every side, operator are got an electric shock, very large potential safety hazard is arranged.
Summary of the invention
For the problem that prior art exists, the present invention proposes a kind of method of processing electroplating wastewater based on low voltage pulsed electric flocculation technology, can when being lower than the 36V safety voltage, electroplating wastewater effectively be processed.
The technical solution used in the present invention is to adopt successively following steps: process electroplating wastewater with pulse electro-flocculation (1), treatment time is 20min ~ 60min, the pulse power is the industrial-frequency alternating current that is input as 220V, 50Hz, the output voltage of the pulse power is 0 ~ 36V, dutycycle is 10% ~ 90%, output frequency is 100Hz ~ 1000Hz, and outward current density is 0.5 A/dm
2~ 3.5 A/dm
2, what the anode of electricity flocculation adopted is the aluminium electrode, and negative electrode adopts stainless steel electrode, and polar plate spacing is 1cm ~ 10cm; (2) the pH value of electroplating wastewater after the adding lime regulating impulse electricity flocculation treatment, the pH value that makes solution is 7.4, the weight ratio of electroplating wastewater was 1:200 ~ 1:40 after lime and pulse electro-flocculation were processed; (3) add diatomite in solution, the weight ratio of electroplating wastewater was 1:200 after diatomite and pulse electro-flocculation were processed, and can discharge or reuse after staticly settling.
The invention has the beneficial effects as follows:
1, the invention solves the common electrical flocculation and in use easily cause the easily aging and high problem of energy consumption of electrode fouling, reduced the voltage of the electric flocculation pulse power, it is worked in being lower than the safety voltage scope of 36V, be conducive to guarantee operator's safety.
2, the present invention adopts low voltage pulsed electric flocculation technology and utilizes diatomite adsorption as auxiliary process, and adsorption filtration is carried out in the water outlet after the paired pulses electricity flocculation treatment, is simple and easy to execute, and cost is low, and efficient is high.
3, the waste water quality of processing meets electroplates pollutant emission standard (GB21900-2008), but water outlet reuse or directly discharging also can be applicable to administer other sanitary sewage or industrial sewage.
Embodiment
The present invention adopts electro-flucculation process that electroplating wastewater is processed, and what anode adopted is the aluminium electrode, and negative electrode adopts stainless steel electrode, and polar plate spacing is 1cm ~ 10cm, and the treatment time is 20min ~ 60min.During processing, the input voltage of the pulse power is 220V, and incoming frequency is 50Hz.The output voltage of the pulse power is 0 ~ 36V, and output frequency is 100Hz ~ 1000Hz, and outward current density is 0.5 A/dm
2~ 3.5 A/dm
2The dutycycle of the pulse power is 10% ~ 90%.After the pulse electro-flocculation processing, the COD of electroplating wastewater and various concentration of metal ions can obviously reduce, but the pH value can be elevated between 5 ~ 7, therefore, the pH value of electroplating wastewater after the need adding lime regulating impulse electricity flocculation treatment, making the pH value of solution is 7.4, add fashionable, lime and pulse electro-flocculation are processed after the weight ratio of electroplating wastewater be 1:200 ~ 1:40.After the pH value is regulated, for further removing each type organic and the inorganics in the waste water, be that the ratio of 1:200 adds diatomite in solution in electroplating wastewater weight ratio after processing with pulse electro-flocculation again, solution carried out adsorption precipitation, but namely obtain reuse or the directly water outlet of discharging after staticly settling.
Below provide 8 embodiment to further specify the present invention:
Embodiment 1:Adopt first the electricity flocculation that electroplating wastewater is processed, the treatment time is 20min.The input voltage of the pulse power is that 220V, incoming frequency are 50Hz, and pulse power dutycycle is 10%, and output frequency is 100Hz, and outward current density is 0.5 A/dm
2, what anode adopted is the aluminium electrode, and negative electrode adopts stainless steel electrode, and polar plate spacing is 1cm.To add lime in the electroplating wastewater through the pulse electro-flocculation processing again, the weight ratio of electroplating wastewater was 1:200 after lime and pulse electro-flocculation were processed, and regulated its pH value, and making the final pH value is 7.4.At last, be that the ratio of 1:200 adds diatomite and carries out adsorption precipitation in electroplating wastewater weight ratio after processing with pulse electro-flocculation again, get supernatant liquid after staticly settling, through diatomite filtration, then draining.
Embodiment 2:The present embodiment as different from Example 1 the electric flocculation treatment time be 30min ~ 60min, the weight ratio of electroplating wastewater was 1:40 after lime and pulse electro-flocculation were processed; Other is identical with embodiment 1.
Embodiment 3:The present embodiment as different from Example 1 output frequency of the pulse power is 500Hz, and the weight ratio of electroplating wastewater was 1:100 after lime and pulse electro-flocculation were processed; Other is identical with embodiment 1.
Embodiment 4:The present embodiment as different from Example 1 when flocculation electricity the pulse power dutycycle be 20% ~ 90%, outward current density is 2.5 A/dm
2Other is identical with embodiment 1.
Embodiment 5:The present embodiment as different from Example 1 when flocculation electricity the pulse power output frequency be 200Hz ~ 1000Hz, polar plate spacing is 5cm, other is identical with embodiment 1.
Embodiment 6:The present embodiment as different from Example 1 when flocculation electricity outward current density be 0.8 A/dm
2~ 3.5 A/dm
2, other is identical with embodiment 1.
Embodiment 7:Polar plate spacing is 1.5cm ~ 10cm to the present embodiment when flocculation electricity as different from Example 1, and outward current density is 3.5 A/dm
2, other is identical with embodiment 1.
Embodiment 8:For certain Electroplate Factory contain chromium, Zinc-containing electroplating waste water, adopt the electricity flocculation that it is processed, the treatment time is 40min.Pulse power dutycycle is 70%, and frequency is 400Hz, and outward current density is 2.5 A/dm
2, what anode adopted is the aluminium electrode, and negative electrode adopts stainless steel electrode, and polar plate spacing is 6cm.To add lime through the electroplating wastewater that pulse electro-flocculation is processed again, regulating the pH value is 7.4, the weight ratio of electroplating wastewater was 1:150 after lime and pulse electro-flocculation were processed, add at last the diatomite adsorption precipitation, the weight ratio of electroplating wastewater was 1:200 after diatomite and pulse electro-flocculation were processed, through diatomite filtration, then discharge water, it is as shown in the table that it goes out water concentration and the influent density indices result after after testing:
| ? | COD | Cr 6+ | Total Zn | pH |
| Influent density (mg/L) | 1640 | 32.89 | 15.81 | 2.37 |
| Go out water concentration (mg/L) | 78 | 0.09 | 0.05 | 7.4 |
Claims (1)
1. method of processing electroplating wastewater based on low voltage pulsed electric flocculation technology is characterized in that adopting successively following steps:
(1) with pulse electro-flocculation electroplating wastewater is processed, treatment time is 20min ~ 60min, the pulse power is the industrial-frequency alternating current that is input as 220V, 50Hz, the output voltage of the pulse power is 0 ~ 36V, dutycycle is 10% ~ 90%, output frequency is 100Hz ~ 1000Hz, and outward current density is 0.5 A/dm
2~ 3.5 A/dm
2, what the anode of electricity flocculation adopted is the aluminium electrode, and negative electrode adopts stainless steel electrode, and polar plate spacing is 1cm ~ 10cm;
(2) the pH value of electroplating wastewater after the adding lime regulating impulse electricity flocculation treatment, the pH value that makes solution is 7.4, the weight ratio of electroplating wastewater was 1:200 ~ 1:40 after lime and pulse electro-flocculation were processed;
(3) add diatomite in solution, the weight ratio of electroplating wastewater was 1:200 after diatomite and pulse electro-flocculation were processed, and can discharge or reuse after staticly settling.
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| CN103130365B (en) * | 2013-03-21 | 2014-06-25 | 江苏大学 | Method for treating explosive waste water through electric flocculation |
| CN103991936A (en) * | 2014-05-20 | 2014-08-20 | 江苏大学 | Coaxial pulsed electro-coagulation device and method for treating gold mine wastewater |
| CN103979646B (en) * | 2014-06-04 | 2015-07-15 | 江苏科技大学 | Continuous electric flocculation water treatment method for dosing along process |
| CN105174562A (en) * | 2015-09-14 | 2015-12-23 | 北京京润环保科技股份有限公司 | Method for electric flocculation treatment of heavy metal wastewater |
| CN105967405A (en) * | 2016-06-28 | 2016-09-28 | 南京德邦金属装备工程股份有限公司 | Treating and recycling method of coal washing wastewater |
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