CN103864185A - Method and device for high-efficiently and quickly oxidizing and fixing arsenic in wastewater based on glow discharge - Google Patents
Method and device for high-efficiently and quickly oxidizing and fixing arsenic in wastewater based on glow discharge Download PDFInfo
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Abstract
The invention relates to the field of environment wastewater disposal, and particularly relates to a method and a device for high-efficiently and quickly oxidizing and fixing arsenic in wastewater based on glow discharge. According to the method and based on the device, plasma technology is applied to a system for disposing wastewater containing As (III), As (V), Fe (III), and Fe(II) ions from metallurgy, mining and the like, As (III) is converted into less-toxic As (V), and Fe (II) in the solution is oxidized into Fe (III) by using a glow discharge system, and simultaneously the hard-soluble amorphous compound precipitate ferric arsenate can be quickly produced at an appropriate pH and within the range of better arsenic-iron mole ratio in the glow discharge plasma system, thereby achieving the purpose of high-efficiency removal of arsenic.
Description
Technical field
The present invention relates to environmental wastewater process field, particularly a kind of method and device thereof that utilizes the fixing arsenic in waste water of the efficient Quick Oxidation of glow discharge.
Background technology
Arsenic (As) is a kind of element extensively distributing in the earth's crust, and is acknowledged as a kind of poisonous carcinogenic substance.The compound of As has trivalent and two kinds of forms of pentavalent, and toxicity and the mobility of As (III) are larger.Research shows, with AsO
3 3-as (III) ratio existing is with AsO
4 3-the toxicity of the As (V) existing will exceed 60 times.Arsenide is when the production fields such as mining, smelting, glass manufacture, agricultural chemicals and wood preservative are used widely, cause a considerable amount of arsenic compound entered environments, and be present in water body, soil, plant, animal, marine organisms and human body with different shape by chemical process and bio-transformation effect, and form circulation between each arsenide.
According to the research of the World Health Organization, as long as there is a small amount of As in tap water, be just enough to the health of human body to endanger.Long-term drinking, containing the water of As, may cause a series of health problems such as Skin pigmentation, skin keratin, skin carcinoma, bladder cancer, hypertension, cardiovascular and cerebrovascular disease, DPN, diabetes.In view of being on the rise that the significant damage of As to HUMAN HEALTH and As pollute, 1993, WHO took the lead in the desired value of As in tap water to be down to 10 μ m/L by 50 μ m/L.Subsequently, Japan, European Union, the U.S. are also decided to be 10 μ g/L by tap water As standard separately respectively." drinking water sanitary standard " that China is used at present (GB5749-2006) requires the peak concentration of As in tap water must be lower than 10 μ g/L.Therefore be very urgent for the processing that contains High Concentration of Arsenic trade effluent.
At present, coagulation is widely used except aluminium, iron-based flocculation agent in As method, and the method is mainly the adsorption arsenic-adsorbing that utilizes coagulating agent powerful, then by filter or with filter membrane except the arsenic in anhydrating.Experimental result shows, molysite to the removal efficiency of arsenic apparently higher than aluminium salt.Molysite is most economical, the most effective precipitation agent.But As (III) toxicity is large and be difficult to be flocculated realization and remove completely.And the toxicity of As (V) is relatively little, and be easily adsorbed, be able to efficient removal.Therefore before applying flocculation technique arsenic removal, need As (III) to carry out preoxidation, AS (III) initial oxidation is become to As (V), and then remove.Conventional oxygenant mainly contains chlorinated lime, hydrogen peroxide, chlorine, ozone and Manganse Dioxide etc.But the method need to add a large amount of flocculation agents, produce a large amount of arsenic-containing waste residues and also can cause secondary pollution, therefore make the application of the method be restricted.
Therefore for the existing defect about trivalent arsenic treatment technology, be badly in need of developing a kind of green, efficient trivalent arsenic treatment technology.Single stage method realizes arsenious Quick Oxidation, removing by arsenic from waste liquid, and reduce final produce arsenic-containing waste residue amount.Scorodite is a kind of ferric arsenate crystal, and its solubleness is little, stable in properties, arsenic content can be up to 30%.Therefore for the arsenic-containing waste water of large concentration, arsenic can be converted into ferric arsenate crystal, reach the object of solid arsenic.Conventional method is under 95 ° of C conditions, to control neutralisation higher than 150 ° of C hydrothermal methods or under atmospheric atmosphere in temperature, but these method costs are higher, the long large-scale application that is unfavorable for of required time.
Direct current glow discharge plasma body water technology is a kind of novel high-level oxidation technology, cardinal principle is that the gas around high voltage needle electrode will be crashed to pieces into positive ion and electronics under the effect of high direct voltage, these particles accelerate to obtain high-energy under high-tension effect, thereby bump with other material, thereby produce new electronics, ion and free radical, chemical substance etc.At present, this kind of technology has been applied to the processing of Organic Pollutants in Wastewater widely, utilizes the material such as hydroxyl radical free radical and hydrogen peroxide producing to realize organic final removal.But this kind of technology is applied to the processing research that contains poisonous mineral ion and also do not obtain everybody and pay close attention to comprehensively.
Summary of the invention
The present invention is directed to deficiency of the prior art, a kind of method and device thereof that utilizes the fixing arsenic in waste water of the efficient Quick Oxidation of glow discharge is provided.
The present invention is applied to plasma technique the system for handling of the waste water such as metallurgy, mining that contains As (III), As (V), Fe (III), Fe (II) ion, utilize glow discharge system that As (III) is converted into the As that toxicity is less (V), Fe in solution (II) is oxidized to Fe (III), in glow discharge plasma system, produce ferric arsenate compound precipitation, realize in-situ precipitate and remove arsenic simultaneously.
Technical scheme of the present invention is:
A treatment process of utilizing the fixing arsenic in waste water of the efficient Quick Oxidation of glow discharge, comprises the following steps:
(1) pending As (III) waste water solution that contains is regulated to pH value and conductivity value, regulate the concentration of Fe (II) in waste water solution, import to electrode glow discharge water treatment device;
(2) under atmospheric atmosphere, carry out glow discharge, connect direct supply and carry out discharge process; After discharge process, in solution, As (III) is oxidized to As (V), Fe (II) is converted into Fe (III) simultaneously, As (V) and Fe (III) produce ferric arsenate co-precipitation, realize fixedly removing arsenic.
On the basis of above scheme, in described step (1), will contain As (III) waste water solution pH value and be adjusted to 3-6, specific conductivity is adjusted to 0.5-6 mS/cm.
On the basis of above scheme, in described step (1), will contain As (III) waste water solution pH value and be adjusted to 6, specific conductivity is adjusted to 3 mS/cm.
On the basis of above scheme, in described step (1), regulating Fe (II)/As (III) mol ratio in waste water solution is 2-4.
On the basis of above scheme, the voltage of the direct supply in described step (2) is 480-1000V, and electric current is 80-500mA.
On the basis of above scheme, in described step (2), in discharge process process, stir, stir speed (S.S.) is turn/s of 2-3.
The invention also discloses the electrode glow discharge water treatment device adopting in a kind of aforesaid method, comprise carbon-point negative electrode, stainless steel anode, glass reactor, Glass tubing, described carbon-point negative electrode and Glass tubing are separately positioned on described glass reactor and cover; Described glass reactor periphery arranges cold hydrazine interlayer, and cooling water inlet and cooling water outlet mouth are set on described cold hydrazine interlayer; The bottom of described Glass tubing seals with quartzy core, and described stainless steel anode is placed in described Glass tubing.
On the basis of above scheme, the quantity of described stainless steel anode is 1-6 root.
On the basis of above scheme, stirring magneton is set in described glass reactor.
The invention has the beneficial effects as follows:
In contacting glow process, can produce a large amount of materials such as hydroxyl radical free radical and hydrogen peroxide, produce the UV-light of wide wavelength simultaneously.The hydroxyl radical free radical isoreactivity material wherein generating can effectively be oxidized to As (V) by As (III).Produced simultaneously hydrogen peroxide, owing to there being the existence generation Fenton's reaction of iron ion, can promote the generation of hydroxyl radical free radical, the oxidation of strengthening As (III).Therefore can realize the Quick Oxidation of As (III), under the effect of hydroxyl radical free radical and hydrogen peroxide, Fe (II) can be converted into Fe (III) simultaneously.At suitable pH and preferably can generate fast the property amorphous compound precipitation hard to tolerate of ferric arsenate in the scope of iron arsenic mol ratio, realize the removal of efficient arsenic.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of electrode glow discharge device of the present invention;
Accompanying drawing 2 is the vertical view of electrode glow discharge device of the present invention;
Accompanying drawing 3 is the removal efficiency of total arsenic under different pH condition;
Embodiment
The specific embodiment of the present invention is as follows:
Embodiment 1:
A treatment process of utilizing the fixing arsenic in waste water of the efficient Quick Oxidation of glow discharge, comprises the following steps:
(1) contain As (III) waste water solution to regulate pH value be 3 and conductivity value 6 mS/cm pending, regulate the concentration of Fe (II) in waste water solution, making Fe in waste water solution (II)/As (III) mol ratio is 2, imports to electrode glow discharge water treatment device;
(2) described glow discharge reactor as shown in Figure 1, applying 4 pin electrodes is stainless steel anode, negative electrode is carbon electrode, and by Glass tubing and the solution phase isolation of sealed bottom core, in the time of electric discharge, every pin electrode contacts with liquid level, and normal operation DC voltage is 480V, and electric current is 80mA, electric discharge is under atmospheric atmosphere, and stir speed (S.S.) is 2 turn/s; After discharge process, in solution, As (III) is oxidized to As (V), Fe (II) is converted into Fe (III) simultaneously, As (V) and Fe (III) produce ferric arsenate co-precipitation, realize fixedly removing arsenic.
Embodiment 2:
A treatment process of utilizing the fixing arsenic in waste water of the efficient Quick Oxidation of glow discharge, comprises the following steps:
(1) contain As (III) waste water solution to regulate pH value be 6 and conductivity value 1 mS/cm pending, regulate the concentration of Fe (II) in waste water solution, making Fe in waste water solution (II)/As (III) mol ratio is 4, imports to electrode glow discharge water treatment device;
(2) described 2 pin electrodes of glow discharge reactor application are stainless steel anode, negative electrode is carbon electrode, and by Glass tubing and the solution phase isolation of sealed bottom core, in the time of electric discharge, every pin electrode contacts with liquid level, normal operation DC voltage is 1000V, electric current is 500mA, and electric discharge is under atmospheric atmosphere, and stir speed (S.S.) is 2 turn/s; After discharge process, in solution, As (III) is oxidized to As (V), Fe (II) is converted into Fe (III) simultaneously, As (V) and Fe (III) produce ferric arsenate co-precipitation, realize fixedly removing arsenic.
Embodiment 3:
As depicted in figs. 1 and 2, a kind of electrode glow discharge water treatment device, comprise carbon-point negative electrode (1), stainless steel anode (2), glass reactor (3), Glass tubing (4), described carbon-point negative electrode (1) and Glass tubing (4) are separately positioned on described glass reactor (3) and cover; Described glass reactor (3) periphery arranges cold hydrazine interlayer (6), and cooling water inlet (7) and cooling water outlet mouth (8) are set respectively on described cold hydrazine interlayer (6); The bottom of described Glass tubing (4) seals with quartzy core, and described stainless steel anode (2) is placed in described Glass tubing (4).
Allocating pending solution: As (III) concentration is the mixing solutions 250mL that 0.8mM, Fe (II) concentration is 1.6mM, utilize sodium sulfate that electrical conductivity of solution is adjusted to 3.0mS/cm left and right, and pH value is adjusted to 3,4,5 with sulfuric acid, 6 four kinds of solution, inject respectively glow discharge reactor, be about 570V at voltage, electric current 100mA, discharge process 10 minutes under the condition of a pin electrode of employing, stir speed (S.S.) is 3 turn/s.
As shown in Figure 3, the total arsenic content in treating processes in waste water solution constantly reduces, and in solution, be accompanied by white precipitate simultaneously and generate, be 6 o'clock removal effect the bests at pH.
As shown in Figure 4, in last minute of discharge process, constantly have the generation of pentavalent arsenic in waste water solution, then, because pentavalent arsenic starts to transform to the precipitation of ferric arsenate, the amount of pentavalent arsenic constantly reduces.After electric discharge, leave standstill through for some time, solution bottom adularescent precipitation generates, and is ferric arsenate amorphous solid.
As can be seen here, while utilizing the waste water that glow discharge processing contains As (III), by regulating the content of Fe (II), can realize fast the oxidation of arsenic and fixedly remove.
Claims (9)
1. a treatment process of utilizing the fixing arsenic in waste water of the efficient Quick Oxidation of glow discharge, is characterized in that: comprise the following steps:
(1) pending As (III) waste water solution that contains is regulated to pH value and conductivity value, regulate the concentration of Fe (II) in waste water solution, import to electrode glow discharge water treatment device;
(2) under atmospheric atmosphere, carry out glow discharge, connect direct supply and carry out discharge process; After discharge process, in solution, As (III) is oxidized to As (V), Fe (II) is converted into Fe (III) simultaneously, As (V) and Fe (III) produce ferric arsenate co-precipitation, realize fixedly removing arsenic.
2. the treatment process of utilizing the fixing arsenic in waste water of the efficient Quick Oxidation of glow discharge according to claim 1, it is characterized in that, in described step (1), will contain As (III) waste water solution pH value and be adjusted to 3-6, specific conductivity is adjusted to 0.5-6 mS/cm.
3. the treatment process of utilizing the fixing arsenic in waste water of the efficient Quick Oxidation of glow discharge according to claim 2, is characterized in that, in described step (1), will contain As (III) waste water solution pH value and be adjusted to 6, specific conductivity is adjusted to 3 mS/cm.
4. the treatment process of utilizing the fixing arsenic in waste water of the efficient Quick Oxidation of glow discharge according to claim 1, is characterized in that, in described step (1), regulating Fe (II)/As (III) mol ratio in waste water solution is 2-4.
5. the treatment process of utilizing the fixing arsenic in waste water of the efficient Quick Oxidation of glow discharge according to claim 1, is characterized in that, in described step (2), in discharge process process, stirs, and stir speed (S.S.) is turn/s of 2-3.
6. according to the treatment process of utilizing the fixing arsenic in waste water of the efficient Quick Oxidation of glow discharge described in claim 1-5 any one, it is characterized in that, the voltage of the direct supply in described step (2) is 480-1000V, and electric current is 80-500mA.
7. one kind according to the electrode glow discharge water treatment device described in claim 1, it is characterized in that: comprise carbon-point negative electrode (1), stainless steel anode (2), glass reactor (3), Glass tubing (4), described carbon-point negative electrode (1) and Glass tubing (4) are separately positioned on described glass reactor (3) and cover; Described glass reactor (3) periphery arranges cold hydrazine interlayer (6), and cooling water inlet (7) and cooling water outlet mouth (8) are set respectively on described cold hydrazine interlayer (6); The bottom of described Glass tubing (4) seals with quartzy core, and described stainless steel anode (2) is placed in described Glass tubing (4).
8. electrode glow discharge water treatment device according to claim 5, is characterized in that the quantity of described stainless steel anode (2) is 1-6 root.
9. electrode glow discharge water treatment device according to claim 5, is characterized in that arranging and stirring magneton (9) in described glass reactor (3).
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