CN103086537A - Method of removing cadmium in water - Google Patents
Method of removing cadmium in water Download PDFInfo
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- CN103086537A CN103086537A CN2012105954712A CN201210595471A CN103086537A CN 103086537 A CN103086537 A CN 103086537A CN 2012105954712 A CN2012105954712 A CN 2012105954712A CN 201210595471 A CN201210595471 A CN 201210595471A CN 103086537 A CN103086537 A CN 103086537A
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Abstract
The invention discloses a method of removing cadmium in water. The method comprises the steps of: introducing cadmium waste water into a flocculation settling pond, adding polymerized aluminum chloride and polyacrylamide to conduct flocculation settling treatment to suspended particulate matters through a flocculant; removing suspended particulate matters from the cadmium waste water, then flowing into an adsorption tower filled with modified attapulgite; firstly backwashing the treated adsorbed filler with an alkaline liquid and then flushing with waste acid each time; and concentrating a cadmium-containing flushing fluid, and then adding excessive sodium sulfide for settling treatment. The method has the characteristics of being simple in process flow, low in running cost, free from generating sludge, high in cadmium removal effect, and the like.
Description
Technical field
The present invention relates to a kind for the treatment of process that contains cadmium sewage, particularly process the sewage of cadmium concentration in 10～100mg/L scope, belong to sewage treatment area in environment protection.
Background technology
Cadmium is that a kind of reserves on earth are than the heavy metal resources of horn of plenty.China's cadmium ore resources reserves occupy the second place of the world, the cadmium resource and be widely used in modern industry production such as smelting, pharmacy and food service industry among.Cadmium is the indispensable element of HUMAN HEALTH, and it extensively is present in human muscle and bone, but content is very little, if serious consequence will occur excess.The discharging that contains cadmium sewage has serious harm to HUMAN HEALTH and industrial or agricultural activity, have the harm such as persistence, toxicity be large, seriously polluted, in case can not be biodegradable after entered environment, great majority participate in the food chain circulation, and finally accumulation in vivo, destroy organism normal physiological Metabolic activity, be detrimental to health.Along with the day by day increase of the mankind to activities in production such as the exploitation of heavy metal, smelting, processing, the heavy metal containing sewage of generation is all greatly to increase in quantity or on kind, has caused serious environmental pollution and the wasting of resources.Therefore the improvement that contains cadmium sewage is still a problems to be solved in world's field of Environment Protection.
At present, process the difference of means both at home and abroad according to it, can be divided into physico-chemical process and biological process, the form that exists in solution according to cadmium is different, treatment process commonly used is divided two classes: the first kind is to make the cadmium ion that is dissolved state in sewage change insoluble heavy metal compound into, remove from sewage through precipitation or floating upper method, concrete grammar has chemical precipitation method, ion exchange method, absorption method etc.; Equations of The Second Kind is to make the heavy metal in sewage concentrate under the condition that does not change its chemical form and separate, and concrete grammar has reverse osmosis method, electroosmose process, evaporation concentration method.The problems such as these class methods can effectively be removed the cadmium in sewage, but it is large all to exist investment, and working cost is high, and the shipwreck after improvement is with up to standard, and sludge yield is large.
For overcoming the deficiencies in the prior art, the invention provides a kind for the treatment of process that contains cadmium sewage, this inventive method technical process is simple, running cost is low, obvious processing effect, in water, residual concentration of cadmium ions is less than 0.2mg/L after primary treatment, and lower than the first discharge standard of national regulation, clearance is up to more than 99.9%; Produce without precipitation, can not cause secondary pollution, and the equal recoverable of the metal oxide in water outlet and sewage.
Summary of the invention
The objective of the invention is for overcoming the deficiencies in the prior art, provide and contained the method for removing cadmium that cadmium concentration is 10mg/L～100mg/L in a kind of disposing of sewage, this method for removing cadmium flow process is simple, running cost is low, obvious processing effect, after primary treatment in water residual concentration of cadmium ions less than 0.2mg/L, first discharge standard lower than national regulation, clearance produces without precipitation up to more than 99.9%, can not cause secondary pollution.
The technical solution used in the present invention is: cadmium wastewater is introduced flocculation sedimentation tank, add polymerize aluminum chloride and polypropylene amine by flocculation agent, suspended particulate to be carried out flocculating settling and process; Cadmium wastewater after the removal suspended particulate is flowed through attapulgite modified adsorption tower is housed; Adsorption stuffing after processing is first used the alkali lye back flushing at every turn, then rinse with spent acid; Concentrate containing the cadmium washing fluid, then add excessive sodium sulphite to carry out precipitation process.
A kind of described method of removing cadmium in sewage, it is characterized in that: the preparation method of described attapulgite modified adsorption stuffing is:
(1) concavo-convex mechanical disintegration is become the particle of 1.0～1.5mm particle diameter, soak 10h in 3% dilute hydrochloric acid, extremely neutral with the alkaline solution washing, and dry in constant temperature (110 ℃) baking oven;
(2) be placed in SRJX-2-9 molding box type resistance furnace and carry out thermal activation 3h, activation temperature is 380 ℃, is made into 13% magma after completing, and adds 5%NaCl sodium 1.5h;
(3) adopt WF-4000 type microwave flashing reactor, under 100Hz, 85 ℃, add 1% Cetyltrimethylammonium bromide to carry out the modification of concavo-convex microwave organism;
(4) concavo-convex stand-by after high speed centrifugation, washing, oven dry after modification.
Water outlet can reach national grade one discharge standard, and clearance is more than 99.9%.
The invention has the beneficial effects as follows:
(1) technical process is simple, and running cost is low;
(2) obvious processing effect, in water, residual concentration of cadmium ions is less than 0.2mg/L after primary treatment, and lower than the first discharge standard of national regulation, clearance is up to more than 99.9%;
When (3) this method for removing cadmium acid, alkali of processing various concentration contained the heavy metal containing sewage such as cadmium, the heavy metal content such as cadmium that all can guarantee water outlet were stably lower than the highest permission emission concentration of industrial sewage and be near or below the concentration of Drinking Water matter standard code.
Embodiment
Cadmium wastewater is introduced flocculation sedimentation tank, add polymerize aluminum chloride and polypropylene amine by flocculation agent, suspended particulate to be carried out flocculating settling and process; Cadmium wastewater after the removal suspended particulate is flowed through attapulgite modified adsorption tower is housed; Adsorption stuffing after processing is first used the alkali lye back flushing at every turn, then rinse with spent acid; Concentrate containing the cadmium washing fluid, then add excessive sodium sulphite to carry out precipitation process.
A kind of described method of removing cadmium in sewage, it is characterized in that: the preparation method of described attapulgite modified adsorption stuffing is:
(1) concavo-convex mechanical disintegration is become the particle of 1.0～1.5mm particle diameter, soak 10h in 3% dilute hydrochloric acid, extremely neutral with the alkaline solution washing, and dry in constant temperature (110 ℃) baking oven;
(2) be placed in SRJX-2-9 molding box type resistance furnace and carry out thermal activation 3h, activation temperature is 380 ℃, is made into 13% magma after completing, and adds 5%NaCl sodium 1.5h;
(3) adopt WF-4000 type microwave flashing reactor, under 100Hz, 85 ℃, add 1% Cetyltrimethylammonium bromide to carry out the modification of concavo-convex microwave organism;
(4) concavo-convex stand-by after high speed centrifugation, washing, oven dry after modification.
Example 1
Concavo-convex mechanical disintegration is become the particle of 1.0mm particle diameter, soak 10h in 3% dilute hydrochloric acid, extremely neutral with the alkaline solution washing, and dry in constant temperature (110 ℃) baking oven; Be placed in SRJX-2-9 molding box type resistance furnace and carry out thermal activation 3h, activation temperature is 380 ℃, is made into 11% magma after completing, and adds 5%NaCl sodium 1.5h; Adopt WF-4000 type microwave flashing reactor, under 100Hz, 85 ℃, add 1% Cetyltrimethylammonium bromide to carry out the modification of concavo-convex microwave organism; Concavo-convex stand-by after high speed centrifugation, washing, oven dry after modification.Cadmium wastewater is introduced flocculation sedimentation tank, add polymerize aluminum chloride and polypropylene amine by flocculation agent, suspended particulate to be carried out flocculating settling and process; Cadmium wastewater after the removal suspended particulate is flowed through attapulgite modified adsorption tower is housed; Adsorption stuffing after processing is first used the alkali lye back flushing at every turn, then rinse with spent acid; Concentrate containing the cadmium washing fluid, then add excessive sodium sulphite to carry out that in the precipitation process water outlet, cadmium content is 0.05mg/L, clearance is 99.90%.
Example 2
Concavo-convex mechanical disintegration is become the particle of 1.2mm particle diameter, soak 10h in 3% dilute hydrochloric acid, extremely neutral with the alkaline solution washing, and dry in constant temperature (110 ℃) baking oven; Be placed in SRJX-2-9 molding box type resistance furnace and carry out thermal activation 3h, activation temperature is 380 ℃, is made into 13% magma after completing, and adds 5%NaCl sodium 1.5h; Adopt WF-4000 type microwave flashing reactor, under 100Hz, 85 ℃, add 1% Cetyltrimethylammonium bromide to carry out the modification of concavo-convex microwave organism; Concavo-convex stand-by after high speed centrifugation, washing, oven dry after modification.Cadmium wastewater is introduced flocculation sedimentation tank, add polymerize aluminum chloride and polypropylene amine by flocculation agent, suspended particulate to be carried out flocculating settling and process; Cadmium wastewater after the removal suspended particulate is flowed through attapulgite modified adsorption tower is housed; Adsorption stuffing after processing is first used the alkali lye back flushing at every turn, then rinse with spent acid; Concentrate containing the cadmium washing fluid, then add excessive sodium sulphite to carry out that in the precipitation process water outlet, cadmium content is 0.02mg/L, clearance is 99.96%.
Example 3
Concavo-convex mechanical disintegration is become the particle of 1.5mm particle diameter, soak 10h in 3% dilute hydrochloric acid, extremely neutral with the alkaline solution washing, and dry in constant temperature (110 ℃) baking oven; Be placed in SRJX-2-9 molding box type resistance furnace and carry out thermal activation 3h, activation temperature is 380 ℃, is made into 15% magma after completing, and adds 5%NaCl sodium 1.5h; Adopt WF-4000 type microwave flashing reactor, under 100Hz, 85 ℃, add 1% Cetyltrimethylammonium bromide to carry out the modification of concavo-convex microwave organism; Concavo-convex stand-by after high speed centrifugation, washing, oven dry after modification.Cadmium wastewater is introduced flocculation sedimentation tank, add polymerize aluminum chloride and polypropylene amine by flocculation agent, suspended particulate to be carried out flocculating settling and process; Cadmium wastewater after the removal suspended particulate is flowed through attapulgite modified adsorption tower is housed; Adsorption stuffing after processing is first used the alkali lye back flushing at every turn, then rinse with spent acid; Concentrate containing the cadmium washing fluid, then add excessive sodium sulphite to carry out that in the precipitation process water outlet, cadmium content is 0.001mg/L, clearance is 99.99%.
Claims (2)
1. method of removing cadmium in sewage is characterized in that:
(1) cadmium wastewater is introduced flocculation sedimentation tank, add polymerize aluminum chloride and polypropylene amine by flocculation agent, suspended particulate to be carried out flocculating settling and process;
(2) cadmium wastewater after the removal suspended particulate is flowed through attapulgite modified adsorption tower is housed;
(3) adsorption stuffing after processing is first used the alkali lye back flushing at every turn, then rinse with spent acid;
(4) concentrate containing the cadmium washing fluid, then add excessive sodium sulphite to carry out precipitation process.
2. a kind of method of removing cadmium in sewage according to claim 1, it is characterized in that: the preparation method of described attapulgite modified adsorption stuffing is:
(1) concavo-convex mechanical disintegration is become the particle of 1.0～1.5mm particle diameter, soak 10h in 3% dilute hydrochloric acid, extremely neutral with the alkaline solution washing, and dry in constant temperature (110 ℃) baking oven;
(2) be placed in SRJX-2-9 molding box type resistance furnace and carry out thermal activation 3h, activation temperature is 380 ℃, is made into 13% magma after completing, and adds 5%NaCl sodium 1.5h;
(3) adopt WF-4000 type microwave flashing reactor, under 100Hz, 85 ℃, add 1% Cetyltrimethylammonium bromide to carry out the modification of concavo-convex microwave organism;
(4) concavo-convex stand-by after high speed centrifugation, washing, oven dry after modification.
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| CN2012105954712A CN103086537A (en) | 2012-12-07 | 2012-12-07 | Method of removing cadmium in water |
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| CN2012105954712A CN103086537A (en) | 2012-12-07 | 2012-12-07 | Method of removing cadmium in water |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102964006A (en) * | 2012-12-12 | 2013-03-13 | 常州大学 | Method for removing cadmium in sewage |
| CN103693774A (en) * | 2013-11-27 | 2014-04-02 | 深圳市水务(集团)有限公司 | Method for simultaneous removal of cadmium and thallium in raw water |
| CN105176965A (en) * | 2015-09-23 | 2015-12-23 | 天津大学 | Preparation method for bactericide and granulous compound soil conditioner prepared from bactericide |
| CN108946896A (en) * | 2018-08-09 | 2018-12-07 | 大连正好环保科技有限公司 | A kind of efficient and environment-friendly type mineral water purification agent and preparation method thereof |
| CN110092483A (en) * | 2019-04-12 | 2019-08-06 | 徐州工程学院 | A kind of high cadmium waste water processing method based on Wei Si Salmonella |
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| CN1978046A (en) * | 2005-12-06 | 2007-06-13 | 甘肃凯西生态环境工程有限公司 | PAL material for removing and controlling heavy metal contaminant |
| CN101186375A (en) * | 2007-12-06 | 2008-05-28 | 合肥工业大学 | Material and method for processing water containing heavy metal ion |
| CN101648735A (en) * | 2009-09-10 | 2010-02-17 | 南京师范大学 | Environmental functional material applied to electroplating wastewater treatment |
| CN101838072A (en) * | 2010-05-31 | 2010-09-22 | 西安热工研究院有限公司 | Treatment system and treatment method for reducing amount of volatile heavy metal sludge in desulfurization wastewater |
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2012
- 2012-12-07 CN CN2012105954712A patent/CN103086537A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1978046A (en) * | 2005-12-06 | 2007-06-13 | 甘肃凯西生态环境工程有限公司 | PAL material for removing and controlling heavy metal contaminant |
| CN101186375A (en) * | 2007-12-06 | 2008-05-28 | 合肥工业大学 | Material and method for processing water containing heavy metal ion |
| CN101648735A (en) * | 2009-09-10 | 2010-02-17 | 南京师范大学 | Environmental functional material applied to electroplating wastewater treatment |
| CN101838072A (en) * | 2010-05-31 | 2010-09-22 | 西安热工研究院有限公司 | Treatment system and treatment method for reducing amount of volatile heavy metal sludge in desulfurization wastewater |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102964006A (en) * | 2012-12-12 | 2013-03-13 | 常州大学 | Method for removing cadmium in sewage |
| CN103693774A (en) * | 2013-11-27 | 2014-04-02 | 深圳市水务(集团)有限公司 | Method for simultaneous removal of cadmium and thallium in raw water |
| CN103693774B (en) * | 2013-11-27 | 2015-10-28 | 深圳市水务(集团)有限公司 | A kind of method simultaneously removing cadmium and thallium in former water |
| CN105176965A (en) * | 2015-09-23 | 2015-12-23 | 天津大学 | Preparation method for bactericide and granulous compound soil conditioner prepared from bactericide |
| CN108946896A (en) * | 2018-08-09 | 2018-12-07 | 大连正好环保科技有限公司 | A kind of efficient and environment-friendly type mineral water purification agent and preparation method thereof |
| CN110092483A (en) * | 2019-04-12 | 2019-08-06 | 徐州工程学院 | A kind of high cadmium waste water processing method based on Wei Si Salmonella |
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Application publication date: 20130508 |