CN102603024A - In-situ cadmium removal method for underground water - Google Patents
In-situ cadmium removal method for underground water Download PDFInfo
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- CN102603024A CN102603024A CN201210106323XA CN201210106323A CN102603024A CN 102603024 A CN102603024 A CN 102603024A CN 201210106323X A CN201210106323X A CN 201210106323XA CN 201210106323 A CN201210106323 A CN 201210106323A CN 102603024 A CN102603024 A CN 102603024A
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Abstract
The invention relates to an in-situ cadmium removal method for underground water. The in-situ cadmium removal method is characterized by comprising the following steps that: cadmium-polluted underground water flows into an injection well, mixed with an added surface active agent in the injection well and then enters an ion flotation grating which is provided with an aerator pipe at the bottom, a great amount of air bubbles are separated when cadmium ions attached on the surfaces air bubbles in the underground water rise to a bubble chamber of the ion flotation grating under the action of air turbulence, and the bubbles are further removed from discharged water through a bubble strengthening separation well so as to improve the quality of the discharged water. The in-situ cadmium removal method of the underground water, disclosed by the invention, has the advantages of high cadmium removal efficiency and long stably running period of a system, and can economically and effectively repair the cadmium-polluted underground water in situ.
Description
Technical field
The present invention relates to a kind of underground water original position and remove the method for cadmium, is to utilize froth-flotation method to remove the cadmium in the underground water, belongs to underground water recovery technique field.
Background technology
Along with the fast development of industry and the rapid increase of mankind's activity; Cadmium is widely used in the production of plating, alloy smelting, pigment, battery, plastics etc.; And produce with use in forms such as waste gas, waste water, waste residue entering environment, the cadmium in these " three wastes " materials infiltrates entering underground water along with sedimentation, rainwater leaching and sewage.Cadmium metal toxicity is very low, but its toxicity of compound is very big, drinks the underground water that cadmium exceeds standard and can cause serious harm to HUMAN HEALTH, it is reported, when cadmium in the water surpasses 0.2mg/L, the resident drink water for a long time and from food picked-up contain the cadmium material, can cause " itai-itai disease ".Experimentation on animals shows that the minimum lethal quantity of small white mouse is 50mg/kg, gets into the cadmium of human body and warm-blooded animal, mainly is accumulated in liver, kidney, pancreas, Tiroidina and the bone, the kidney organ is waited pathology takes place, and influence people's normal activity.Cause that anaemia, hypertension, neurodynia, sclerotin are soft, illness such as ephritis and dyssecretosis.Therefore, effectively remove cadmium pollution in the underground water and become the very urgent task in environmental protection field.
At present, processing contains the phreatic method of cadmium and mainly can be divided into dystopy treatment technology and in-situ treatment technology.The dystopy treatment technology mainly is with containing after cadmium underground water extracts out, through methods such as physics, chemical methods cadmium being separated; The in-situ treatment technology mainly is meant the permeable reactive barrier technology, loads different media in the waterbearing stratum, through absorption or metallic reducing effect cadmium is removed.The dystopy treatment technology is mainly used in the underground water that receives cadmium pollution more serious; The in-situ treatment technology is mainly used in slight cadmium pollution underground water; Though absorption or metallic reducing method can effectively be removed the cadmium in the underground water; But adsorption medium is easy to reach capacity after reaction for some time, and owing to the metal medium surface passivation, treatment effect is difficult to be protected metal medium after reaction for some time.
Summary of the invention
In order to overcome the defective that existing underground water in-situ treatment cadmium technology exists, the object of the present invention is to provide a kind of underground water original position to remove the method for cadmium, it adopts the restoring cadmium polluted phreatic in-situ treatment technology of ion floatation method; Removal efficient is high, can make in the water cadmium ion remove more abundant; System's cycle of operation is long, can need replacement/regeneration when avoiding the adsorption technology medium to reach capacity with cadmium ion in the underground water attached to separating on the bubble, and system can not be moved continuously.
For realizing above-mentioned purpose, technical scheme of the present invention is achieved in that the method for a kind of underground water original position except that cadmium, strengthens the separation well by injection well, ion flotation grid, foam and constitutes; It is characterized in that concrete steps are following: flowed into by cadmium pollution underground water and inject well, chemicals feed pump pumps into tensio-active agent and injects into well through drug tube, mixes injecting into well with receiving cadmium pollution underground water; Get into the water distributing area of ion flotation grid afterwards; Upwards flow along packing layer through water distributing area underground water, air gets into packing layer through being arranged on ion flotation grid bottom aeration tube with the micro-bubble form under the gas blower effect simultaneously, and bubble gets in the underground water in packing layer; Cadmium ion rises to the foam room of ion flotation grid in the underground water attached to bubble surface; Most of bubble is managed to be separated through row's bubble and is got into collection bubble case, and water outlet gets into the foam reinforcement through water outlet and separates well, and remaining foam sticks on elastic solid filler; Foam is further removed, improved effluent quality.
Wherein inject into well vertical perforated pipe is set, dosing pump links to each other on perforated pipe and the ground, and tensio-active agent pumps into perforated pipe through dosing pump, contains cadmium underground water thorough mixing thereby make in tensio-active agent and the well;
The ion flotation grid constitutes by steeped pipe and water outlet by water distributing area, aeration tube, packing layer, foam room, row; Ion flotation grid upstream face and back side are water-tight structure, and its material can be stainless steel plate or precast slab;
Wherein water distributing area is in the ion flotation grid, and loading particle diameter in the water distributing area is the pebbles of 5cm-15cm, and water distributing area thickness is between 25cm-40cm;
Aeration tube is laid on the water distributing area bottom and is rich font pipe, and the perforate aperture is 5mm, guarantees to form bubble diameter below 5mm;
The filler of placing in the packing layer can be zeolite, haydite etc., and the packing material size size depends on local AQUIFER HYDRAULIC, guarantees that the packing layer PQ is more than 20 times of AQUIFER HYDRAULIC;
The foam room is located at ion flotation grid top, is used for the enrichment foam.
Water outlet is arranged on ion flotation grid back side one side, packing layer top, and water outlet is higher than waterbearing stratum end face 50cm-100cm, makes water outlet get into foam with the drop form and strengthens the separation well.
On the foam reinforcement separation well liquid level high-density elastic solid filler is set, foam not separated in the water outlet of ion flotation grid can be held back by elastic solid filler, further improves effluent quality.
Positive beneficial effect of the present invention really is
(1) it is high to remove efficient, compares with the original position adsorption technology, adopts original position ion flotation technology, can make in the water cadmium ion remove more abundant;
(2) system's cycle of operation long, the ion flotation technology attached to separating on the bubble, needs replacement/regeneration when avoiding the adsorption technology medium to reach capacity with cadmium ion in the underground water, and system can not be moved continuously.
Description of drawings
Fig. 1 is that a kind of underground water original position is removed the cadmium process schematic representation
Among the figure 1, inject well; 2, drug tube; 3, aeration tube; 4, water distributing area; 5, packing layer; 6, foam room; 7, water outlet; 8, row's bubble pipe; 9, collection bubble case; 10, foam is strengthened the separation well; 11, elastic solid filler; 12, chemicals feed pump; 13, gas blower.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further description: as shown in Figure 1,A kind of underground water original position is removed the method for cadmium, strengthens separation well 10 by injection well 1, ion flotation grid, foam and constitutes; It is characterized in that concrete steps are following: flowed into by cadmium pollution underground water and inject well 1; Chemicals feed pump 12 pumps into tensio-active agent and injects in the well 1 through drug tube 2; In injecting well 1, mix, get into the water distributing area 4 of ion flotation grid afterwards, upwards flow along packing layer 5 through water distributing area 4 underground water with receiving cadmium pollution underground water; Air gets into packing layer 5 through being arranged on ion flotation grid bottom aeration tube 3 with the micro-bubble form under gas blower 13 effects simultaneously; Bubble gets in the underground water in packing layer 5, and cadmium ion rises to the foam room 6 of ion flotation grid attached to bubble surface in the underground water, and most of bubble is separated through row's bubble pipe 8 and gets into collection bubble case 9; Water outlet gets into foam through water outlet 7 and strengthens separation well 10; Remaining foam sticks on elastic solid filler 11, and foam is further removed, and improves effluent quality.
Wherein inject vertical drug tube 2 is set in the well 1, chemicals feed pump 12 links to each other on drug tube 2 and the ground, and tensio-active agent pumps into perforated pipe through chemicals feed pump 12, contains cadmium underground water thorough mixing thereby make in tensio-active agent and the well;
The ion flotation grid is by being made up of water distributing area 4, aeration tube 3, packing layer 5, foam room 6, row's bubble pipe 8 and water outlet 7; Ion flotation grid upstream face and back side are water-tight structure, and its material can be stainless steel plate or precast slab;
Wherein water distributing area 4 is in the ion flotation grid, and loading particle diameter in the water distributing area 4 is the pebbles of 5cm-15cm, and water distributing area 4 thickness are between 25cm-40cm;
It is rich font pipe that aeration tube 3 is laid on water distributing area 4 bottoms, and the perforate aperture is 5mm, guarantees to form bubble diameter below 5mm;
The filler of placing in the packing layer 5 can be zeolite, haydite etc., and the packing material size size depends on local AQUIFER HYDRAULIC, guarantees that the packing layer PQ is more than 20 times of AQUIFER HYDRAULIC;
Foam room 6 is located at ion flotation grid top, is used for the enrichment foam.
Water outlet 7 is arranged on ion flotation grid back side one side, packing layer top, and water outlet is higher than waterbearing stratum end face 50cm-100cm, makes water outlet get into foam with the drop form and strengthens the separation well.
On the foam reinforcement separation well liquid level high-density elastic solid filler 11 is set, foam not separated in the ion flotation grid water outlet 7 can be held back by elastic solid filler 11, further improves effluent quality.
Claims (9)
1. a underground water original position is removed the method for cadmium, strengthens and separates well and constitute by injecting well, ion flotation grid, foam; It is characterized in that concrete steps are following: flowed into by cadmium pollution underground water and inject well, chemicals feed pump pumps into tensio-active agent and injects into well through drug tube, mixes injecting into well with receiving cadmium pollution underground water; Get into the water distributing area of ion flotation grid afterwards; Upwards flow along packing layer through water distributing area underground water, air gets into packing layer through being arranged on ion flotation grid bottom aeration tube with the micro-bubble form under the gas blower effect simultaneously, and bubble gets in the underground water in packing layer; Cadmium ion rises to the foam room of ion flotation grid in the underground water attached to bubble surface; Most of bubble is managed to be separated through row's bubble and is got into collection bubble case, and water outlet gets into the foam reinforcement through water outlet and separates well, and remaining foam sticks on elastic solid filler; Foam is further removed, improved effluent quality.
2. a kind of underground water original position according to claim 1 is removed the method for cadmium; It is characterized in that described inject into well vertical chemical feed pipe is set; Chemicals feed pump links to each other on chemical feed pipe and the ground, and tensio-active agent pumps into chemical feed pipe through chemicals feed pump, thereby makes tensio-active agent and contain cadmium underground water thorough mixing.
3. a kind of underground water original position according to claim 1 is removed the method for cadmium, it is characterized in that said ion flotation grid steeps pipe by water distributing area, aeration tube, packing layer, foam room, row and water outlet constitutes; Wherein ion flotation grid upstream face and back side are water-tight structure, and its material is stainless steel plate or precast slab.
4. a kind of underground water original position according to claim 3 is removed the method for cadmium, it is characterized in that described water distributing area in ion flotation grid bottom, and loading particle diameter in the water distributing area is the pebbles of 5cm-15cm, and thickness is between 25cm-40cm.
5. a kind of underground water original position according to claim 3 is removed the method for cadmium, it is characterized in that described aeration tube is rich font pipe for being laid on the water distributing area bottom, and the perforate aperture is 5mm, guarantees to form bubble diameter below 5mm.
6. a kind of underground water original position according to claim 3 is removed the method for cadmium, it is characterized in that the filler of placing in the described packing layer is zeolite, haydite.
7. a kind of underground water original position according to claim 3 is removed the method for cadmium, it is characterized in that described foam room at ion flotation grid top, is used for the enrichment foam.
8. a kind of underground water original position according to claim 3 is removed the method for cadmium; It is characterized in that said water outlet is arranged on ion flotation grid back side one side; Packing layer top, water outlet are higher than waterbearing stratum end face 50cm-100cm, make water outlet get into foam with the drop form and strengthen the separation well.
9. a kind of underground water original position according to claim 1 is removed the method for cadmium, it is characterized in that on the described foam reinforcement separation well liquid level high-density elastic solid filler being set, and foam not separated in the water outlet of ion flotation grid can be held back by elastic solid filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201210106323 CN102603024B (en) | 2012-04-12 | 2012-04-12 | In-situ cadmium removal method for underground water |
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| CN 201210106323 CN102603024B (en) | 2012-04-12 | 2012-04-12 | In-situ cadmium removal method for underground water |
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| CN102603024B CN102603024B (en) | 2013-10-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102923822A (en) * | 2012-11-08 | 2013-02-13 | 中国环境科学研究院 | Restoring device and restoring method for treating fluorine pollution of groundwater |
| CN104150582A (en) * | 2014-08-19 | 2014-11-19 | 中国建筑设计研究院 | Modularized energy-saving spatial formula sewage treatment device and system thereof used for multi-floor buildings |
| CN104310666A (en) * | 2014-10-09 | 2015-01-28 | 常州大学 | Method for repairing heavy metal chromium in underground water |
| CN104310667A (en) * | 2014-10-09 | 2015-01-28 | 常州大学 | Device for repairing heavy metal cadmium in underground water |
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| CN101805048A (en) * | 2010-03-17 | 2010-08-18 | 上海大学 | Method for efficiently treating chromium (VI) pollution of underground water |
| CN102389776A (en) * | 2011-10-09 | 2012-03-28 | 广东省生态环境与土壤研究所 | Metal heavy absorbent and preparation method and use thereof |
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- 2012-04-12 CN CN 201210106323 patent/CN102603024B/en not_active Expired - Fee Related
Patent Citations (6)
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| KR100506037B1 (en) * | 2002-12-02 | 2005-08-09 | 임창성 | Apparatus for disposing waste water |
| CN101021062A (en) * | 2007-02-15 | 2007-08-22 | 陈建庭 | Stereo in-situ ecological urban water system repairing process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102923822A (en) * | 2012-11-08 | 2013-02-13 | 中国环境科学研究院 | Restoring device and restoring method for treating fluorine pollution of groundwater |
| CN104150582A (en) * | 2014-08-19 | 2014-11-19 | 中国建筑设计研究院 | Modularized energy-saving spatial formula sewage treatment device and system thereof used for multi-floor buildings |
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| CN104310666A (en) * | 2014-10-09 | 2015-01-28 | 常州大学 | Method for repairing heavy metal chromium in underground water |
| CN104310667A (en) * | 2014-10-09 | 2015-01-28 | 常州大学 | Device for repairing heavy metal cadmium in underground water |
| CN104310667B (en) * | 2014-10-09 | 2016-05-11 | 常州大学 | A kind of device of repairing heavy metal cadmium in underground water |
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| CN102603024B (en) | 2013-10-16 |
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Granted publication date: 20131016 Termination date: 20140412 |