CN102424457B - Treating system for industrial wastewater containing heavy metal and treating method thereof - Google Patents
Treating system for industrial wastewater containing heavy metal and treating method thereof Download PDFInfo
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- CN102424457B CN102424457B CN 201110331829 CN201110331829A CN102424457B CN 102424457 B CN102424457 B CN 102424457B CN 201110331829 CN201110331829 CN 201110331829 CN 201110331829 A CN201110331829 A CN 201110331829A CN 102424457 B CN102424457 B CN 102424457B
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Abstract
The invention provides a treating system for industrial wastewater containing heavy metal. The system comprises an electrolytic tank (1); the electrolytic tank (1) comprises a first trough wall (11) and a second trough wall (12), which are arranged to be opposite; positive plates (2) and negative plates (3) are staggerly arranged in the electrolytic tank (1), the first ends of the positive plates (2) are fixed on the first trough wall (11), the first ends of the negative plates (3) are fixed on the second trough wall (12), and each negative plate (3) is a starting sheet of a tri-dimensional network structure. According to the invention, because of utilization of the tri-dimensional network structure in the treating system, the negative starting sheets have substantially improved capacity in bearing stress, and the problem of short circuit of cathodes and anodes caused by cracking of the negative plates is avoided; the operation of plate stripping is omitted. The invention also provides a treating method for industrial wastewater containing heavy metal by using the treating system.
Description
Technical field
The present invention relates to Industrial Wastewater Treatment and resource and reclaim the field, especially, relate to a kind for the treatment of system of low levels heavy metal industrial effluent.In addition, the invention still further relates to a kind for the treatment of process that comprises the low levels heavy metal industrial effluent of above-mentioned treatment system.
Background technology
Trade effluent is one of important source of current environment pollution, and various countries attach great importance to the processing of trade effluent and the recycling of resource.At present, the treatment process of the acid industrial effluent of heavy metal ion content below 15 grams per liters mainly contained two kinds: one, neutralization precipitation method; Two, electrodeposition sedimentation.
The neutralization precipitation method is to process at present the most general technique of low levels heavy metal industrial effluent, its process characteristic is that technical maturity is simple, heavy metal industrial effluent after can guaranteeing to process reaches environmental emission standard, but also have following fatal deficiency: utilizing the neutralization precipitation method to process the resulting product of heavy metal ion industrial effluent is that the metal ion grade only has the mud of several percentage points, and its economic worth is had a greatly reduced quality; Must carry out purification processes as arriving the contained heavy metal of above-mentioned mud is recycled, this certainly will cause the secondary pollution to environment; As heavy metal ion content being reached environmental emission standard at the 15 following heavy metal industrial effluent of grams per liter by the neutralization precipitation method, production cost is higher.
The electrodeposition sedimentation is processed the acid industrial effluent of heavy metal ion content below 15 grams per liters and is mainly contained two kinds: one, dull and stereotyped electrodeposition process, two, strengthen electrodeposition process.Wherein, can only obtain the spongy metal settling on dull and stereotyped electrodeposition process negative electrode, because the anti-oxidation processing cost to spongy metal is higher, so dull and stereotyped electrodeposition process can only obtain metal content at the product below 80%.Wherein, strengthening electrodeposition process is comparatively advanced in the market treatment process, its ultimate principle is by the particular design to electrodeposition equipment, strengthen the mass transfer of metal ion in electrolytic deposition process, reduce to greatest extent due to the too low concentration polarization that causes of metal ions in waste liquor content, simultaneously by making adding of special additive metal ion separate out and guarantee higher cathode efficiency with the fine crystallization of densification on negative electrode.At present, this technique Main Problems in production application is: the device fabrication cost is higher; The floor space of equipment is larger; The additive cost that extracts one ton of amount of metal from waste liquid is higher; There is certain limitation in process range, only have metal ion content 6 grams per liters when above its economic benefit just apparent in view; When the metal ion content in waste liquid is reduced to 1 grams per liter when following, its cathode efficiency will decline to a great extent, and cause production cost obviously to propose; Stable equipment operation is relatively poor; Device security is not high, and cathode deposition exists cracking to cause the possibility of anode and cathode short circuit; The labour intensity of production operation is larger, and the operation of stripping plate needs to complete by manual operations.
Summary of the invention
The object of the invention is to provide a kind of simple in structure, high treatment system that contains heavy metal industrial effluent of metal purity of reclaiming, and existing Industry Waste is high except the treatment facility cost, metal purity that reclaim is low to solve, the technical problem of complicated operation.
For achieving the above object, the invention provides a kind for the treatment of system that contains heavy metal industrial effluent, comprise: electrolyzer, this electrolyzer comprises the first cell wall and the second cell wall that is oppositely arranged, be staggeredly equipped with positive plate and negative plate in electrolyzer, the first end of positive plate is fixed on the first cell wall, and the first end of negative plate is fixed on the second cell wall, and the second end of each negative plate is between two adjacent positive plates; Each negative plate is the beginning pole plate of tridimensional network.
Further, positive plate is the positive plate of netted titanium coating structure.
Further, treatment system also comprises the treatment solution mixing section, and the treatment solution mixing section is communicated with electrolyzer by a connecting pipe with valve.
Further, be provided with stirrer in the treatment solution mixing section.
Further, treatment system also comprises circulation groove and transfer tank, and circulation groove is communicated with the treatment solution mixing section, and circulation groove can inject pending liquid with controlling in the treatment solution mixing section; Transfer tank is connected with the upper end of electrolyzer.
Further, be provided with recycle pump between circulation groove and treatment solution mixing section.
Further, transfer tank and circulation groove are communicated with, and are provided with reflux pump between transfer tank and circulation groove.
A kind for the treatment of process that contains heavy metal industrial effluent, use above-mentioned treatment system, concrete steps are: the first step, a certain amount of pending solution is injected in circulation groove, add appropriate additive, ON cycle pump, stirrer and reflux pump are evenly distributed additive pending liquid circular flow 10～20 minutes in pending liquid; Second step makes the electrolyzer energising, and when the concentration of metal ions of electrolytic solution was greater than or equal to 2 grams per liter, cathode current density was controlled at 370A/m2～450A/m2; Less than 2 grams per liters and when being greater than or equal to 500ppm, cathode current density is controlled at 320A/m2～370A/m2 when the concentration of metal ions of electrolytic solution; During less than 500ppm, cathode current density is controlled at 270A/m2～320A/m2 when the concentration of metal ions of electrolytic solution; The 3rd step during less than 100ppm, finished electrolysis when the concentration of metal ions of electrolytic solution, took out negative plate, and the negative electrode starting sheet of packing into new.
Further, the additive that adds in the first step is macromolecular organic compound.This macromolecular organic compound is preferably gelatine, dried network element or thiocarbamide.
Further, in second step, the monitoring of the concentration of metal ions of electrolytic solution is that (Chinese of EDTA was: ethylenediamine tetraacetic acid (EDTA)) electrolytic solution is carried out titrimetry every 1.5～2.5 hours use EDTA.
The present invention has following beneficial effect:
1, treatment system of the present invention is due to the negative electrode beginning pole plate that uses tridimensional network, and the ability that meets with stresses of this negative electrode beginning pole plate improves greatly, has avoided the negative plate cracking to cause the problem of anode and cathode short circuit; Make the metal precipitate that is adsorbed in electrolytic process on negative electrode beginning pole plate can pass this negative electrode beginning pole plate, thereby negative plate need not rotation or mobile in electrolytic process, the precipitate that is collected at negative electrode beginning pole plate both sides combines securely, has greatly improved stability and the safety performance of equipment.
2, treatment system of the present invention owing to having used the material negative electrode beginning pole plate identical with the electrolysis precipitate, therefore in electrolytic process, after the electrolysis precipitate is adsorbed onto on negative electrode beginning pole plate, need not to shell the plate operation, and the level of automation of equipment obviously improves.
3, treatment process of the present invention is owing to having added additive, and the heavy metal concentration of waste liquid after treatment is reduced to 0.5 grams per liter, minimum heavy metal concentration can be reduced to the ppm level even as required; The cathode efficiency of this treatment process can integral body remain on more than 80%, and corresponding power consumption cost will be effectively reduced.
Except purpose described above, feature and advantage, the present invention also has other purpose, feature and advantage.The below is with reference to figure, and the present invention is further detailed explanation.
Description of drawings
The accompanying drawing that consists of the application's a part is used to provide a further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the industrial wastewater treatment system structural representation of the preferred embodiment of the present invention, and what in figure, electrolyzer partly represented is vertical view.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Referring to Fig. 1, a kind for the treatment of system that contains heavy metal industrial effluent comprises: electrolyzer 1, circulation groove 5 and transfer tank 6.One side of electrolyzer 1 is provided with treatment solution mixing section 4, treatment solution mixing section 4 is communicated with electrolyzer 1, be provided with connecting pipe 41 between treatment solution mixing section 4 and electrolyzer 1, be provided with valve on this connecting pipe 41, pending solution is entered in electrolyzer 1 by connecting pipe 41.Be provided with stirrer 42 in treatment solution mixing section 4, when being added with additive in pending solution, open stirrer 42, make additive fully mix before pending solution is entering electrolyzer 1, and be evenly distributed.Circulation groove 5 is communicated with treatment solution mixing section 4, be provided with recycle pump 7 between circulation groove 5 and treatment solution mixing section 4, circulation groove 5 is that trade effluent is the reservoir of pending solution, processing power according to this treatment system, disposable a certain amount of trade effluent is injected in circulation groove 5, after adding additive, by recycle pump 7, pending solution is drawn in treatment solution mixing section 4, is re-introduced in electrolyzer 1.Preferably, this additive is macromolecular organic compound.Electrolyzer 1 is communicated with transfer tank 6 by pipeline 61, and the end that this pipeline 61 is connected with electrolyzer 1 is arranged on the upper end of electrolyzer 1, and when the electrolytic solution in electrolyzer 1 was excessive, electrolytic solution flow in transfer tank 6 after overflowing electrolyzer 1 from pipeline 61.Transfer tank 6 is communicated with circulation groove 5, is provided with reflux pump 8 between transfer tank 6 and circulation groove 5, like this, after opening reflux pump 8, can in time the electrolytic solution that overflows in transfer tank 6 be extracted to circulation groove 5, realizes the cyclic electrolysis of pending solution.
Electrolyzer 1 comprises the first cell wall 11 and the second cell wall 12 that is oppositely arranged, be provided with abreast the mounting groove of a plurality of positive plates 2 on the first cell wall 11, be provided with abreast the mounting groove of a plurality of negative plates 3 on the second cell wall 12, the position of the mounting groove of the mounting groove of these a plurality of positive plates 2 and these a plurality of negative plates 3 is staggered.Positive plate 2 is fixed on the first cell wall 11 by the mounting groove of positive plate 2, negative plate 3 is fixed on the second cell wall 12 by the mounting groove of negative plate 3, polylith positive plate 2 and polylith negative plate 3 are arranged in electrolyzer 1 alternately, the end that positive plate 2 stretches out the first cell wall 11 gos deep between two adjacent negative plates 3, the end that negative plate 3 stretches out the second cell wall 12 gos deep between two adjacent positive plates 2, i.e. positive plate 2 and negative plate 3 setting that overlaps.Negative plate 3 is the negative electrode beginning pole plate of tridimensional network, and namely the inside of negative plate 3 is the mesh-like structure of hollow out, and this mesh-like structure is rule or irregular Polygons supporting structure.Negative plate 3 uses and is made by the same material of the precipitate in electrolytic solution, like this, after the electrolysis precipitate is adsorbed on this negative electrode beginning pole plate, as long as negative electrode is begun can be sold together after pole plate takes out, need not to shell the plate operation.Preferably, positive plate 2 is the positive plate of netted titanium coating structure.Preferably, electrolyzer 1 also comprises electrolyte circulation system, exhaust treatment system, electric control cooling system.
A kind for the treatment of process that contains heavy metal industrial effluent provided by the invention, use above-mentioned treatment system, concrete steps are: the first step, a certain amount of pending solution is injected in circulation groove 5, add appropriate additive, ON cycle pump 7, stirrer 42 and reflux pump 8 with pending liquid circular flow 10～20 minutes, are evenly distributed additive in pending liquid; Second step makes electrolyzer 1 energising, and when the concentration of metal ions of electrolytic solution was greater than or equal to 2 grams per liter, the control cathode current density was at 400A/m
2Less than 2 grams per liters and when being greater than or equal to 500ppm, the control cathode current density is at 350A/m when the concentration of metal ions of electrolytic solution
2During less than 500ppm, the control cathode current density is at 300A/m when the concentration of metal ions of electrolytic solution
2The 3rd step during less than 100ppm, finished electrolysis when the concentration of metal ions of electrolytic solution, took out negative plate 3, and the new negative plate 3 of packing into, used in order to next electrolysis.Preferably, the additive that adds in the first step is macromolecular organic compound, this macromolecular organic compound is preferably gelatine, dried network element or thiocarbamide, such macromolecular organic compound is the cathode surface active substance, its mechanism of action in electrolytic process is to form one deck macromolecule membrane on the surface of negative plate 3, reach the purpose that reduces the negative electrode concentration polarization and improve the electrochemical cathode polarization, guarantee that cathode deposition can be separated out with densification, fine crystallization, bulk, high-purity form under higher cathode current density.Preferably, in second step, the monitoring of the concentration of metal ions of electrolytic solution is that (Chinese of EDTA was: ethylenediamine tetraacetic acid (EDTA)) electrolytic solution is carried out titrimetry every 1.5～2.5 hours use EDTA.Preferably, in second step, the energising boot program of electrolyzer 1 is: open successively electrolyte circulation system, exhaust treatment system, electric control cooling system, open direct supply after definite said system runs well, pass into direct current according to the cathode current density of the negative electrode useful area of equipment and setting electric effusion is carried out the metal electro-deposition recycling.Shutdown programm when preferably, finishing electrolysis in the 3rd step is: after the metal ion content in electric effusion drops to process set value, close successively direct supply, electric control cooling system, the recycle system, exhaust treatment system.
As other embodiment, the span of the current density of the second step in treatment process of the present invention, can be when satisfying corresponding concentration of metal ions value, choose arbitrarily in following scope: when the concentration of metal ions of electrolytic solution was greater than or equal to 2 grams per liter, cathode current density was controlled at 370A/m
2～450A/m
2Less than 2 grams per liters and when being greater than or equal to 500ppm, cathode current density is controlled at 320A/m when the concentration of metal ions of electrolytic solution
2～370A/m
2During less than 500ppm, cathode current density is controlled at 270A/m when the concentration of metal ions of electrolytic solution
2～320A/m
2
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. treatment system that contains heavy metal industrial effluent, comprise: electrolyzer (1), described electrolyzer (1) comprises the first cell wall (11) and the second cell wall (12) that is oppositely arranged, and is staggeredly equipped with positive plate (2) and negative plate (3) in described electrolyzer (1), it is characterized in that:
The first end of described positive plate (2) is fixed on described the first cell wall (11), the first end of described negative plate (3) is fixed on described the second cell wall (12), and the second end of each described negative plate (3) is positioned between adjacent two described positive plates (2);
Each described negative plate (3) is the beginning pole plate of tridimensional network;
Described treatment system also comprises treatment solution mixing section (4), and described treatment solution mixing section (4) is communicated with described electrolyzer (1) by a connecting pipe with valve (41);
Described treatment system also comprises circulation groove (5) and transfer tank (6), and described circulation groove (5) is communicated with described treatment solution mixing section (4), and described circulation groove (5) can inject pending liquid with controlling in described treatment solution mixing section (4);
Described transfer tank (6) is connected with the upper end of described electrolyzer (1).
2. the treatment system that contains heavy metal industrial effluent according to claim 1, is characterized in that,
Described positive plate (2) is the titanium anode plate of netted iridium tantalum coating structure.
3. the treatment system that contains heavy metal industrial effluent according to claim 1, is characterized in that,
Be provided with stirrer (42) in described treatment solution mixing section (4).
4. the treatment system that contains heavy metal industrial effluent according to claim 3, is characterized in that,
Be provided with recycle pump (7) between described circulation groove (5) and described treatment solution mixing section (4).
5. the treatment system that contains heavy metal industrial effluent according to claim 4, is characterized in that,
Described transfer tank (6) and described circulation groove (5) are communicated with, and are provided with reflux pump (8) between described transfer tank (6) and described circulation groove (5).
6. treatment process that contains heavy metal industrial effluent, right to use requires 5 described treatment systems, it is characterized in that, and concrete steps are:
The first step, a certain amount of pending liquid is injected in described circulation groove (5), add appropriate additive, open described recycle pump (7), described stirrer (42) and described reflux pump (8) with pending liquid circular flow 10～20 minutes, additive is evenly distributed in pending liquid, and described additive is gelatine, dried network element or thiocarbamide;
Second step is given described electrolyzer (1) energising, and when the concentration of metal ions of electrolytic solution was greater than or equal to 2 grams per liter, the control cathode current density was at 370A/m
2～450A/m
2Less than 2 grams per liters and when being greater than or equal to 500ppm, the control cathode current density is at 320A/m when the concentration of metal ions of electrolytic solution
2～370A/m
2During less than 500ppm, the control cathode current density is at 270A/m when the concentration of metal ions of electrolytic solution
2～320A/m
2
The 3rd step during less than 100ppm, finished electrolysis when the concentration of metal ions of electrolytic solution, took out negative plate, and the new negative plate of packing into.
7. the treatment process that contains heavy metal industrial effluent according to claim 6, is characterized in that,
In described second step, the monitoring of the concentration of metal ions of electrolytic solution is undertaken by using EDTA to carry out titrimetry to electrolytic solution every 1.5～2.5 hours.
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| CN 201110331829 CN102424457B (en) | 2011-10-27 | 2011-10-27 | Treating system for industrial wastewater containing heavy metal and treating method thereof |
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| CN 201110331829 CN102424457B (en) | 2011-10-27 | 2011-10-27 | Treating system for industrial wastewater containing heavy metal and treating method thereof |
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| CN104370345B (en) * | 2014-08-29 | 2017-01-25 | 冯胜 | Sewage treatment device |
| CN108277502A (en) * | 2017-01-06 | 2018-07-13 | 上海奇谋能源技术开发有限公司 | A method of being directly separated copper and tin alloy mixture using electrolysis |
| CN108101161B (en) * | 2017-12-18 | 2019-01-25 | 王珏 | A kind of heavy metal-polluted water treatment system |
| CN108558083B (en) * | 2018-05-07 | 2019-04-23 | 陕西中环信环保科技有限公司 | A kind of heavy metal wastewater thereby integrated approach device |
| CN111912090A (en) * | 2020-08-21 | 2020-11-10 | 南京贝特空调设备有限公司 | Condensate recovery device and system thereof |
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| NO321256B1 (en) * | 2002-08-26 | 2006-04-10 | Oro As | Electrode designs and their use |
| TWI286998B (en) * | 2004-06-17 | 2007-09-21 | Univ Nat Chiao Tung | Equipment for treating wastewater |
| CN201390683Y (en) * | 2009-04-17 | 2010-01-27 | 湖州森蓝环境工程有限公司 | Multistage electrolysis device for treating cyanide containing wastewater |
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