CN102417255A - Efficient and economic mercury-containing waste water treatment method - Google Patents
Efficient and economic mercury-containing waste water treatment method Download PDFInfo
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- CN102417255A CN102417255A CN2011103187092A CN201110318709A CN102417255A CN 102417255 A CN102417255 A CN 102417255A CN 2011103187092 A CN2011103187092 A CN 2011103187092A CN 201110318709 A CN201110318709 A CN 201110318709A CN 102417255 A CN102417255 A CN 102417255A
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Abstract
the invention relates to an efficient and economic mercury-containing waste water treatment method. The efficient and economic mercury-containing waste water treatment method comprises the following steps of 1, adding an alkaline substance into high-concentration mercury-containing waste water so that the total mercury concentration is reduced to mercury concentration below 0.6mg/L, and 2, when the total mercury concentration of the high-concentration mercury-containing waste water is below 0.6mg/L, adding a sulfur-containing chelating agent into the high-concentration mercury-containing waste water according to 0.005 to 0.2% of the volume of the high-concentration mercury-containing waste water, adjusting a pH value of the mixed solution to a pH value of 3 to 7, adding 0.5 to 10% by mass of a flocculating agent into the clear solution according to a flocculating agent-clear solution volume ratio of 0.001 to 0.01 when mercury in the mixed solution is separated out, and carrying out solid-liquid separation after flocculating to obtain clarified waste water of which total mercury content is below 0.001mg/L. The efficient and economic mercury-containing waste water treatment method has the advantages that mercury removal efficiency is high; a scope of application is wide; a preparation treatment cost and a low equipment investment are low; and mercury-containing precipitates are gathered naturally and solid waste residues are treated centrally so that recovery and recycle are easy.
Description
Technical field
The invention belongs to method of wastewater treatment, particularly a kind of mercury-containing waste water treatment process of highly economical.
Background technology
The treatment process of mercury-containing waste water has sulphide precipitation, ion exchange method, active carbon adsorption, solvent extration, metallic reducing method etc. at present.
There is the mercurous molecule granule of suspended state in sulphide precipitation, is difficult to condense solid-liquid separation, and total mercury content surpasses 0.005mg/L usually in the treated water; Ion exchange method and active carbon adsorption processing cost are high, are not suitable for the higher mercury-containing waste water of starting point concentration, and the resin after the absorption is difficult to recycle; Solvent extration is not suitable for the processing of a large amount of water quality in the industry, also needs solvent in the secondary treatment water; The metallic reducing method is applied in mercury processing in the external water, and the treatment facility investment is big, cost is high.
Summary of the invention
The mercury-containing waste water treatment process that the purpose of this invention is to provide a kind of highly economical through system optimization; Be suitable for the wastewater treatment of various total mercury concentration; Adopt the step-by-step processing novel process; Have technology simple, can reduce removal of mercury sequestrant usage quantity, reduce and comprise the advantages such as mercury-containing waste water comprehensive treating process expense of eliminating secondary pollution, thereby realize efficient, economic removal of mercury purpose.
Technical solution of the present invention is: the method that a kind of mercury-containing waste water is handled; Be suitable for various concentration mercury-containing waste waters and handle, when comprising the steps: that total mercury content is 0.6～2000mg/L in the waste water, in mercury-containing waste water, add alkaline matter; Make pH value in the water between 9～13; Behind the mixing, separate out the compound containing mercury deposition in the water, separate the total mercury amount that obtains clear liquid and reduce to below the 0.6mg/L; Total mercury content is that 0.6mg/L is when following in the waste water; Regulating the waste water pH value is under 9～13 the alkaline condition; Press 0.005%～0.2% of mercury-containing waste water volume and add the sulfur-bearing sequestrant, regulate the pH value then between 3～7, chelating forms insoluble mercurous molecule or molecule granule; Adding massfraction by clear liquid volume ratio 0.001～0.01 again is 0.5%～10% flocculation agent, and flocculation is carried out solid-liquid separation after forming macrobead, obtains the clear liquid total mercury content and is lower than 0.001mg/L; Separating the solid slag that obtains focuses on.
Described sulfur-bearing sequestrant is one of alkyl nabam salt or ammonium salt, dithioamnoformic acid modifying starch, dithiocarbamic acid polymkeric substance DTCR, tri-thiol triazine trisodium TMT.
Described flocculation agent is one of Poly aluminum Chloride (PAC), bodied ferric sulfate, iron trichloride, SEPIGEL 305, ZX-I.
Described alkaline matter is one of solution or suspension-s of alkali metal hydroxide, alkaline earth metal hydroxides, strong base-weak acid salt, carbide slag pulp-water.
The present invention can handle the high density mercury-containing waste water to 0.0001～0.001mg/L, and water outlet is mercurous to be lower than 0.001mg/L electron trade emission standard, and removal of mercury efficient is high; Processing power of the present invention does not receive the influence of wastewater temperature, potential of hydrogen, suspended substance and saltiness, and the scope of application is wide; Because adopt the step-by-step processing mercury-containing waste water, it is low that the present invention handles reagent cost, less equipment investment is simple to operate; The present invention is mercurous to be deposited in natural enrichment in the treating processes, and waste residue is prone to recycling; The waste residue pulp-water that acetylene generation technology produced during the mercury-containing waste water that the present invention produces generated by polyvinyl chloride by calcium carbide, the carbide slag pulp-water that uses were produced as generated by polyvinyl chloride by calcium carbide has been realized the comprehensive utilization of the treatment of wastes with processes of wastes against one another.
Description of drawings
Accompanying drawing is a process flow sheet of the present invention.
Embodiment
Concrete technological process of the present invention is: with reference to accompanying drawing, high density mercury-containing waste water total mercury after the super-alkaline substance precipitation process is reduced to below the 0.6mg/L.The waste water that total mercury is lower than 0.6mg/L adopts sulfur-bearing sequestrant chelating to form insoluble mercurous molecule or molecule granule; Form macrobead after adding flocculation agent; Handle through solid-liquid separation; The clear liquid total mercury content is lower than 0.001mg/L, can satisfy current national and relate to the strictest industry (like electron trade) of mercury industry to the mercury emissions standard-required.The solid separated waste residue focuses on.
Embodiment 1 total mercury concentration is the acid waste water of 50mg/L～200mg/L
Total mercury amount 150～200mg/L before the sample wastewater treatment, content of hydrochloric acid 10%～15% adds solid sodium hydroxide or milk of lime and makes in the water pH value between 9～13, separate out the mercury deposition behind the mixing in the water, and the clear liquid total mercury amount that separation obtains is lower than 0.6mg/L.
Clear liquid pH value is between 9～13; Add dithiocarbamic acid polymkeric substance DTCR solution (dithiocarbamic acid content 10%～15%) by 0.02%～0.2% of clear liquid volume; Regulate the pH value behind the mixing between 3～7, the mercury in the solution is chelated and separates out, and adding massfraction by clear liquid volume ratio 0.001～0.01 is 10% liquor ferri trichloridi flocculation agent; Liquid-solid separation obtains handling the back clear liquid, uses cold atomic absorption to measure total mercury content to be＜0.001mg/L.
Embodiment 2 total mercury concentration are the acid waste water of 30mg/L～50mg/L
Total mercury amount 30mg/L～50mg/L before the sample wastewater treatment, pH value 1～3 adds carbide slag slurries clear liquid waterborne, regulates the pH value between 9～13, separates out the mercury deposition behind the mixing, separates the clear liquid total mercury amount that obtains and is lower than 0.6mg/L.
Clear liquid pH value is between 9～13; The dithioamnoformic acid modifying starch (dithiocarbamic acid content 20～30%) that adds clear liquid quality 0.01%～0.1%; Regulate the pH value between 3～7, the mercury in the solution is chelated and separates out, and adding massfraction by clear liquid volume ratio 0.001～0.01 is 10% polymeric ferrous sulphate solution; Liquid-solid separation obtains handling the back clear liquid, and using cold atomic absorption to measure total mercury content is 0.0001～0.001mg/L.
Embodiment 3 total mercury concentration are the alkaline waste water of 2.2mg/L～2.8mg/L
Total mercury amount 2.2mg/L～2.8mg/L before the sample wastewater treatment, the pH value adds sodium sulphite 9～10, regulates the pH value between 9～13, separates out the mercury deposition behind the mixing, separates the clear liquid total mercury amount that obtains and is lower than 0.6mg/L
Clear liquid pH value is between 9～13; Add tri-thiol triazine trisodium TMT solution (TMT content 10%～15%) by 0.02%～0.2% of clear liquid volume; Regulate the pH value behind the mixing between 3～7; Mercury in the solution is chelated and separates out, and adding massfraction by clear liquid volume ratio 0.001～0.01 is 10% Poly aluminum Chloride (PAC), and the clear liquid that liquid-solid separation obtains uses cold atomic absorption mensuration total mercury content to be 0.0001mg/L～0.001mg/L.
The alkaline waste water of embodiment 4 total mercury concentration＜0.6mg/L
Total mercury amount 0.3mg/L～0.4mg/L before the sample wastewater treatment; Total alkali content 2%～10% reduces pH value to 9～13 with acid, and adding mercury-containing waste water volume ratio is 0.005%～0.05% Sodium dimethyldithiocarbamate 40min (dithiocarbamic acid content 75～85%); Regulate pH between 3～7; Mercury in the solution is chelated and separates out, and adding massfraction by clear liquid volume ratio 0.001～0.01 is 0.5% polyacrylamide solution, leaves standstill back mercury slag and separates out; Clear liquid is measured with cold atomic absorption after the processing that obtains, and total mercury content is 0.0001mg/L～0.001mg/L.
Claims (4)
1. the mercury-containing waste water treatment process of a highly economical; Be suitable for various concentration mercury-containing waste waters and handle, it is characterized in that: when comprising the steps: that total mercury content is 0.6～2000mg/L in the waste water, in mercury-containing waste water, add alkaline matter; Make pH value in the water between 9～13; Behind the mixing, separate out the compound containing mercury deposition in the water, separate the total mercury amount that obtains clear liquid and reduce to below the 0.6mg/L; Total mercury content is that 0.6mg/L is when following in the waste water; Regulating the waste water pH value is under 9～13 the alkaline condition; Press 0.005%～0.2% of mercury-containing waste water volume and add the sulfur-bearing sequestrant, regulate the pH value then between 3～7, chelating forms insoluble mercurous molecule or molecule granule; Adding massfraction by clear liquid volume ratio 0.001～0.01 again is 0.5%～10% flocculation agent, and flocculation is carried out solid-liquid separation after forming macrobead, obtains the clear liquid total mercury content and is lower than 0.001mg/L; Separating the solid slag that obtains focuses on.
2. the mercury-containing waste water treatment process of highly economical as claimed in claim 1 is characterized in that: described sulfur-bearing sequestrant is one of alkyl nabam salt or ammonium salt, dithioamnoformic acid modifying starch, dithiocarbamic acid polymkeric substance DTCR, tri-thiol triazine trisodium TMT.
3. the mercury-containing waste water treatment process of highly economical as claimed in claim 1, it is characterized in that: described flocculation agent is one of Poly aluminum Chloride (PAC), bodied ferric sulfate, iron trichloride, SEPIGEL 305, ZX-I.
4. the mercury-containing waste water treatment process of highly economical as claimed in claim 1 is characterized in that: described alkaline matter is one of solution or suspension-s of alkali metal hydroxide, alkaline earth metal hydroxides, strong base-weak acid salt, carbide slag pulp-water.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103394282A (en) * | 2013-08-13 | 2013-11-20 | 国家电网公司 | Additive for inhibiting re-release of mercury during wet method flue gas desulfurization process and using method thereof |
| CN104944635A (en) * | 2015-06-08 | 2015-09-30 | 中国石油集团工程设计有限责任公司 | High-concentration mercury-containing gas field wastewater treatment method |
| CN105565453A (en) * | 2015-12-19 | 2016-05-11 | 湖南科技大学 | Preparation method and application of composite coagulant for manganese-containing wastewater treatment |
| CN105600902A (en) * | 2015-12-19 | 2016-05-25 | 湖南科技大学 | Preparation method and application of coagulant for removing Mn and Mn-DOM |
| CN106915812A (en) * | 2015-12-28 | 2017-07-04 | 沈阳中科环境工程科技开发有限公司 | A kind of chemical nickle-plating wastewater inorganic agent and preparation method thereof |
| CN110577269A (en) * | 2019-10-15 | 2019-12-17 | 湖南亿康环保科技有限公司 | Composite reagent for removing manganese and ammonia nitrogen in wastewater and application method thereof |
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| CN1449362A (en) * | 2000-07-07 | 2003-10-15 | 微巴公司 | Process and apparatus for removal of heavy metals from wastewater |
| CN1579964A (en) * | 2003-08-04 | 2005-02-16 | 上海理工大学 | New method for treating waste water |
| CN1673117A (en) * | 2005-03-17 | 2005-09-28 | 周石来 | Treating process of mercury-containing waste water |
| CN101186373A (en) * | 2007-11-30 | 2008-05-28 | 华南理工大学 | Method for processing paroxysmal mercury polluted water under emergency condition |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1449362A (en) * | 2000-07-07 | 2003-10-15 | 微巴公司 | Process and apparatus for removal of heavy metals from wastewater |
| CN1579964A (en) * | 2003-08-04 | 2005-02-16 | 上海理工大学 | New method for treating waste water |
| CN1673117A (en) * | 2005-03-17 | 2005-09-28 | 周石来 | Treating process of mercury-containing waste water |
| CN101186373A (en) * | 2007-11-30 | 2008-05-28 | 华南理工大学 | Method for processing paroxysmal mercury polluted water under emergency condition |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103394282A (en) * | 2013-08-13 | 2013-11-20 | 国家电网公司 | Additive for inhibiting re-release of mercury during wet method flue gas desulfurization process and using method thereof |
| CN103394282B (en) * | 2013-08-13 | 2015-04-22 | 国家电网公司 | Additive for inhibiting re-release of mercury during wet method flue gas desulfurization process and using method thereof |
| CN104944635A (en) * | 2015-06-08 | 2015-09-30 | 中国石油集团工程设计有限责任公司 | High-concentration mercury-containing gas field wastewater treatment method |
| CN105565453A (en) * | 2015-12-19 | 2016-05-11 | 湖南科技大学 | Preparation method and application of composite coagulant for manganese-containing wastewater treatment |
| CN105600902A (en) * | 2015-12-19 | 2016-05-25 | 湖南科技大学 | Preparation method and application of coagulant for removing Mn and Mn-DOM |
| CN105600902B (en) * | 2015-12-19 | 2017-12-05 | 湖南科技大学 | A kind of preparation method and application for being used to remove Mn and Mn DOM coagulant |
| CN106915812A (en) * | 2015-12-28 | 2017-07-04 | 沈阳中科环境工程科技开发有限公司 | A kind of chemical nickle-plating wastewater inorganic agent and preparation method thereof |
| CN110577269A (en) * | 2019-10-15 | 2019-12-17 | 湖南亿康环保科技有限公司 | Composite reagent for removing manganese and ammonia nitrogen in wastewater and application method thereof |
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