CN101973609A - Method for removing soluble Cr (VI) in wastewater by utilizing electric arc discharge - Google Patents
Method for removing soluble Cr (VI) in wastewater by utilizing electric arc discharge Download PDFInfo
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- CN101973609A CN101973609A CN 201010508530 CN201010508530A CN101973609A CN 101973609 A CN101973609 A CN 101973609A CN 201010508530 CN201010508530 CN 201010508530 CN 201010508530 A CN201010508530 A CN 201010508530A CN 101973609 A CN101973609 A CN 101973609A
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Abstract
The invention discloses a method for removing soluble Cr (VI) in wastewater by utilizing electric arc discharge, which comprises the following concrete steps of: adjusting a soluble Cr (VI)-contained wastewater solution to be treated to a certain pH value to be guided into a sealed electric arc discharge device; introducing discharge gas into the sealed electric arc discharge device and switching on a direct current power supply for carrying out discharge treatment; and effectively reducing Cr (VI) in the solution by carrying out discharge treatment for 10-15 minutes. According to the invention, the Cr (VI) in the chromium-contained wastewater is reduced by utilizing a plasma gas electric arc discharge device; and the method has the advantages of uniqueness, novelty, high reducing efficiency, no any chemical reagent, simple needed equipment, convenient operation, lower cost and convenient popularization and use.
Description
Technical field
The present invention relates to the environmental wastewater process field, being specifically related to is that a kind of arc-over that utilizes is removed solubility Cr (VI) in the waste water.
Background technology
Chromium (Cr) compound is the indispensable industrial raw material of industry such as metallurgical industry, metal processing plating, pigment, printing and dyeing, textile production and process hides.These industry all can output contain Cr waste water every day in a large number.Wherein Cr (VI) has strong oxidizing property, and is very easily water-soluble, and very strong flowability is arranged in environment.Compare with the Cr of other valence states, the toxicity maximum of Cr (VI) is carcinogenic, teratogenesis, mutagenic " three cause " pollutent.International cancer institute is classified as carcinogens to Cr (VI).In view of the very big hazardness of Cr (VI), countries in the world are the discharging of strict control Cr (VI) all.Therefore, high Cr (VI) trade effluent must be handled through removing Cr (VI) before discharging.
Handle the method that contains Cr (VI) waste water at present and mainly contain reduction-precipitation, absorption, ion-exchange, galvanic deposit, biological dechromisation, reverse osmosis and electrodialysis etc.Wherein, the reduction-precipitator method are most widely used, and its ultimate principle is to add reductive agent Cr (VI) is reduced into the less Cr of toxicity (III) under acidic conditions in containing Cr (VI) waste water, and then add basic agent raising pH value of solution value formation Cr (OH)
3Precipitation is separated at last and is removed.But still there are many drawbacks in this technology, as for guaranteeing that Cr (VI) is fully reduced, needs to add excessive reductive agent, not only increases processing cost, also causes the wasting of resources, produces a large amount of mud simultaneously, easily causes secondary pollution.In recent years, some researchists adopt electrochemical process reduction Cr (VI), and this method need consume the Fe electrode, and easily produces passivation phenomenon, and reduction efficiency is low.Other treatment process also all respectively has shortcoming, and is slow as absorption method speed, the difficult life of saturated sorbent material; Ion exchange method exists the difficult life of ion exchange resin, shortcomings such as complicated operation equally.
Therefore, set up a kind of secondary pollution that do not produce, simple to operate to contain Cr (VI) method of wastewater treatment very urgent.The present invention utilizes arc-over can efficiently reduce Cr (VI), simultaneously without any need for chemical reducing agent, has advantages such as environmental protection, equipment requirements be simple, easy to operate, thereby very practical, and good application prospects is arranged.
Summary of the invention
In view of chemical reduction method reduction Cr (VI) needs a large amount of reductive agents, produce a large amount of mud and easily cause shortcomings such as secondary pollution, the invention provides a kind of simple, efficient, Cr (VI) method of reducing of need not any chemical reducing agent.
The invention technical scheme:
A kind of method of utilizing arc-over to remove solubility Cr (VI) in the waste water is characterized in that: comprise the following steps:
(1), pending solubility Cr (VI) waste water solution that contains is adjusted to certain pH value, import to airtight arc discharge device;
(2), feed discharge gas, connect direct supply and carry out discharge process at airtight arc discharge device; Got final product Cr (VI) in effective reducing solution in discharge process 10-15 minute.
The described method of utilizing arc-over to remove solubility Cr (VI) in the waste water, it is characterized in that described arc discharge device is that an airtight synthetic glass container is as discharge vessel, import pending solubility Cr (VI) waste water solution that contains in the discharge vessel, stainless steel plate is installed as negative electrode in the bottom of container, there is the inlet mouth and the air outlet of discharge gas the upper end, there is a stainless steel needle liquid level of solution upper end as anode, and anode and liquid level apart from 3-5mm.Feed discharge gas by inlet mouth during discharge.
The described method of utilizing arc-over to remove solubility Cr (VI) in the waste water is characterized in that described pH value is adjusted in less than 2 or greater than 8 o'clock, reduction effect was better; The voltage range 1350-1650V of direct-current discharge, electric current are the 35-45 milliampere; Described discharge gas is an argon gas.
Inventive principle:
The gaseous arc discharge can produce the UV-light of a large amount of electronics, low energy ion (being mainly the argon ion with a unit positive charge) and wide wavelength region, under the comprehensive action of these physical factors, water molecules is ionized various free radicals such as generating hydrated electron, hydrogen atom and hydroxyl radical free radical.Wherein reductive free radical such as hydrated electron, hydrogen atom can effectively reduce Cr (VI) to Cr (III), and reaction formula is as follows:
e
aq -+Cr(Ⅵ)→Cr(Ⅲ)K＝2.1×10
10L/(mol·s)，pH?7
H·+Cr(Ⅵ)→Cr(Ⅲ)K＝2.0×10
10L/(mol·s)，pH?7
The present invention utilizes Cr (VI) in the plasma gas arc discharge device reduction chromate waste water, and method is unique novel, and the reduction efficiency height does not need any chemical reagent.And required equipment is simple, and is easy to operate, and cost is also lower, is convenient to promote the use of.
Description of drawings
Fig. 1 is the structural representation of arc discharge device.
Fig. 2 is the variation (Cr (VI) starting point concentration be 40 μ g/mls) of Cr (VI) relative concentration in the potassium bichromate solution of different pH with the argon gas arc-over treatment time.
Embodiment
As shown in Figure 1, this apparatus structure comprises A: reometer; B: stainless steel needle (anode); C: stainless steel plate (negative electrode); D: synthetic glass container; E: magnet rotor; F: magnetic stirring apparatus; G: refrigerating unit; I: inlet mouth; O: air outlet; S: sample solution; R: resistance; V: voltmeter.
Regulate Cr (VI) concentration respectively and be the potassium bichromate solution pH value to 2.0,5.9,8.0 of 40 μ g/ml, respectively get 20ml and inject discharge synthetic glass container D, feed argon gas, be about 1500V at voltage, discharge process is 10 minutes under the electric current 40mA condition, every sampling in two minutes once.Test finishes, and utilizes diphenyl carbazide spectrophotometry to measure remaining Cr (VI) relative concentration in the solution.According to experimental result, Cr in the potassium bichromate solution of pH 2 (VI) clearance when discharge process 2min just reaches 97.6%, Cr (VI) clearance reaches more than 97% when discharge process 10min in pH 8 solution, substantially, reach the removal level of the identical time Cr of discharge process (VI) under pH 2 conditions, test-results is seen accompanying drawing 2.Above experimental result show the argon gas arc-over can be efficiently, Cr (VI) in the fast restore solution.
Claims (3)
1. a method of utilizing arc-over to remove solubility Cr (VI) in the waste water is characterized in that: comprise the following steps:
(1), pending solubility Cr (VI) waste water solution that contains is adjusted to certain pH value, import to airtight arc discharge device;
(2), feed discharge gas, connect direct supply and carry out discharge process at airtight arc discharge device; Got final product Cr (VI) in effective reducing solution in discharge process 10-15 minute.
2. the method for utilizing arc-over to remove solubility Cr (VI) in the waste water according to claim 1, it is characterized in that described arc discharge device is that an airtight synthetic glass container is as discharge vessel, import pending solubility Cr (VI) waste water solution that contains in the discharge vessel, stainless steel plate is installed as negative electrode in the bottom of container, there is the inlet mouth and the air outlet of discharge gas the upper end, there is a stainless steel needle liquid level of solution upper end as anode, and anode and liquid level apart from 3-5mm.
3. the described method of utilizing arc-over to remove solubility Cr (VI) in the waste water according to claim 1 and 2 is characterized in that described pH value is adjusted in less than 2 or greater than 8 o'clock, reduction effect was better; The voltage range 1350-1650V of direct-current discharge, electric current are the 35-45 milliampere; Described discharge gas is an argon gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010508530 CN101973609A (en) | 2010-10-14 | 2010-10-14 | Method for removing soluble Cr (VI) in wastewater by utilizing electric arc discharge |
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| CN 201010508530 CN101973609A (en) | 2010-10-14 | 2010-10-14 | Method for removing soluble Cr (VI) in wastewater by utilizing electric arc discharge |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179030A (en) * | 2011-05-05 | 2011-09-14 | 中国地质大学（武汉） | Method for detoxifying and solidifying Cr(VI) by utilizing metakaolin base mineral polymer added with Na2S.9H2O |
| CN102424449A (en) * | 2011-10-14 | 2012-04-25 | 南京大学 | Method for removing hexavalent chromium in water by utilizing low temperature plasma |
| CN103896372A (en) * | 2014-02-20 | 2014-07-02 | 中国石油大学(华东) | Method and device for synergistically treating As(III) and Cr(VI)-containing wastewater by virtue of glow discharge |
| CN104030391A (en) * | 2014-07-01 | 2014-09-10 | 中山大学 | Method and device for removing hexavalent chromium in water through micro-plasma |
| CN104047017A (en) * | 2014-07-01 | 2014-09-17 | 中山大学 | Method and device for preparing nano cuprous oxide by utilizing micro-plasmas |
| CN104118892A (en) * | 2014-07-01 | 2014-10-29 | 中山大学 | Method for preparing nano magnesium hydroxide from microplasma seawater |
| CN109205870A (en) * | 2018-10-30 | 2019-01-15 | 山东大学 | A method of processing contains Cr (VI) waste water |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557731A (en) * | 2004-01-16 | 2004-12-29 | 浙江大学 | Slide arc discharging plasma device for organic waste water treatment |
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2010
- 2010-10-14 CN CN 201010508530 patent/CN101973609A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557731A (en) * | 2004-01-16 | 2004-12-29 | 浙江大学 | Slide arc discharging plasma device for organic waste water treatment |
Non-Patent Citations (3)
| Title |
|---|
| 《Environ. Sci. Technol.》 20081021 LEI WANG et al Plasma-Induced Reduction of Chromium(VI) in an Aqueous Solution 第8493页第2节、第8494页第3.2节，图1 1 第42卷, 第22期 2 * |
| 《Environ. Sci. Technol.》 20081021 LEI WANG et al Plasma-Induced Reduction of Chromium(VI) in an Aqueous Solution 第8493页第2节、第8494页第3.2节，图1 2-3 第42卷, 第22期 2 * |
| 《Nuclear Instruments and Methods in Physics Research B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS》 20100319 Zhigang Ke et al A paradigm study for assessment of phenylalanine's damage under arc-discharge irradiation 第1619页第2.2节、第1619-1620页第3.1节，图1 2-3 第268卷, 2 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179030A (en) * | 2011-05-05 | 2011-09-14 | 中国地质大学（武汉） | Method for detoxifying and solidifying Cr(VI) by utilizing metakaolin base mineral polymer added with Na2S.9H2O |
| CN102179030B (en) * | 2011-05-05 | 2012-06-06 | 中国地质大学（武汉） | Method for detoxifying and solidifying Cr(VI) by utilizing metakaolin base mineral polymer added with Na2S.9H2O |
| CN102424449A (en) * | 2011-10-14 | 2012-04-25 | 南京大学 | Method for removing hexavalent chromium in water by utilizing low temperature plasma |
| CN102424449B (en) * | 2011-10-14 | 2013-07-03 | 南京大学 | Method for removing hexavalent chromium in water by utilizing low temperature plasma |
| CN103896372A (en) * | 2014-02-20 | 2014-07-02 | 中国石油大学(华东) | Method and device for synergistically treating As(III) and Cr(VI)-containing wastewater by virtue of glow discharge |
| CN103896372B (en) * | 2014-02-20 | 2016-01-20 | 中国石油大学(华东) | Glow discharge associated treatment is utilized to contain As (III), the method for Cr (VI) waste water and device thereof |
| CN104030391A (en) * | 2014-07-01 | 2014-09-10 | 中山大学 | Method and device for removing hexavalent chromium in water through micro-plasma |
| CN104047017A (en) * | 2014-07-01 | 2014-09-17 | 中山大学 | Method and device for preparing nano cuprous oxide by utilizing micro-plasmas |
| CN104118892A (en) * | 2014-07-01 | 2014-10-29 | 中山大学 | Method for preparing nano magnesium hydroxide from microplasma seawater |
| CN104047017B (en) * | 2014-07-01 | 2016-07-27 | 中山大学 | A kind of method and apparatus utilizing microplasma to prepare nano cuprous oxide |
| CN109205870A (en) * | 2018-10-30 | 2019-01-15 | 山东大学 | A method of processing contains Cr (VI) waste water |
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Application publication date: 20110216 |