CN106745652A - The processing method of arsenic-containing waste water - Google Patents
The processing method of arsenic-containing waste water Download PDFInfo
- Publication number
- CN106745652A CN106745652A CN201611261242.1A CN201611261242A CN106745652A CN 106745652 A CN106745652 A CN 106745652A CN 201611261242 A CN201611261242 A CN 201611261242A CN 106745652 A CN106745652 A CN 106745652A
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- China
- Prior art keywords
- waste water
- arsenic
- reaction
- sedimentation basin
- containing waste
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The processing method of the arsenic-containing waste water that the present invention is introduced is included in dearsenification slag and provides under nucleating condition, and with hydrogen peroxide as oxidant, molysite makees the arsenic in precipitating reagent precipitation waste water.Waste water energy stably reaching standard discharge after treatment.
Description
Technical field
The present invention relates to a kind of processing method of arsenic-containing waste water.
Background technology
Arsenic-containing waste water can be being produced using many industrial trades such as sulphide ore production sulfuric acid, pesticide producings.The toxicity of arsenic is very
Greatly.If arsenic-containing waste water is not processed and enters environment, it will cause Heavy environmental pollution.The processing method of current arsenic-containing waste water mainly has
Chemical precipitation method, absorption method and membrane separation process.Wherein chemical precipitation method is most widely used due to low cost.Due to relating to arsenic industry
Level of clean production generally improve, the arsenic concentration in waste water is also more and more lower（A few mg/litre~tens mg/litres）, thus
The sediment for causing chemical precipitation method to produce is very thin, and separation of solid and liquid is difficult, the waste water after treatment is difficult to stably reaching standard and discharges.Open
Dearsenification effect is good, simple to operate for hair, the arsenic-containing waste water that dearsenification slag is easily processed, secondary environmental pollution is small processing method have compared with
Big practical value.
The content of the invention
For current arsenic-containing waste water treatment exist problem, the purpose of the present invention be find dearsenification effect it is good, simple to operate,
The processing method of the arsenic-containing waste water that dearsenification slag is easily processed, secondary environmental pollution is small, it is characterised in that arsenic-containing waste water feeding is anti-
Device is answered, dearsenification slag, FeSO is added4Or Fe2(SO4)3, add hydrogen peroxide.Every cubic metre of waste water adds the amount of dearsenification slag with butt
It is calculated as 500g~1500g;Every mole of arsenic adds 1.5 moles~2.5 moles FeSO in waste water4Or Fe2(SO4)3（If in waste water
Iron-holder exceed this value, be both not added with iron, also not remove iron）;The addition of hydrogen peroxide is that whole arsenic in waste water are oxidized into pentavalent
Arsenic, whole iron（The iron contained in itself including waste water and the iron for adding）It is oxidized to 120%~150% of theoretical amount needed for ferric iron.
After the completion of charging, the pH value for adjusting waste water (when the pH value of waste water is less than 2.0, does not carry out pH value regulation) to 2~5.In normal temperature
Lower stirring reaction 50min~70min, stirring intensity is 30 r/min~120 r/min.After oxidation reaction terminates, milk of lime is used
Or the pH value of NaOH solution regulation waste water continues stirring reaction 10min~20min at normal temperatures to 6~9, stirring intensity is 30
R/min~120 r/min.Waste water after precipitation reaction terminates enters sedimentation basin precipitation 1.0h~3.0h.The supernatant of sedimentation basin
Qualified discharge.Irregularly extract sediment out from sedimentation basin to be filtered, filtrate Returning reactor, filter residue（Dearsenification slag）Return part
Reactor is returned, remainder is disposed by the associated specifications of dangerous disposition of solid waste.
The object of the present invention is achieved like this, and arsenic-containing waste water adds FeSO4Or Fe2(SO4)3, after hydrogen peroxide, main hair
Raw following reaction：
AsO3 3- + H2O2 = AsO4 3- + H2O
2Fe2+ + H2O2 + 2H+ = 2Fe3+ + 2H2O
Add the main following reaction of generation after milk of lime or NaOH：
H+ + OH- = H2O
AsO4 3- + Fe3+ = FeAsO4
Fe3+ + 3OH- = Fe(OH)3
By above-mentioned series reaction, the arsenic in solution is with FeAsO4The form of precipitation is removed, and reaches waste water dearsenification purification
Purpose.
Dearsenification slag part returns to the effect for using and is to provide FeAsO4With Fe (OH)3Good nucleating condition, it is to avoid generation is difficult
The fine grained FeAsO of precipitation4With Fe (OH)3, improve its precipitation and separation of solid and liquid performance, it is ensured that the waste water stably reaching standard after treatment
Discharge.Experiment shows：When waste water of the arsenic concentration less than 20mg/L is processed, under equal conditions, dearsenification slag is added without, particle diameter is small
In 1 micron of sediment about 20% or so, precipitate poor performance, processed waste water is unable to qualified discharge；Add de-
After arsenic slag.The particle diameter of sediment is all higher than 1 micron, and precipitate performance is good, the waste water energy stably reaching standard discharge after treatment.
Relative to existing method, the present invention makees " nucleator ", substantially improves FeAsO using dearsenification slag4With Fe (OH)3's
Deposition condition, significantly increases the particle diameter of these sediments, thus the energy rapid precipitation in sedimentation basin, so that after ensureing treatment
Waste water stably reaching standard is discharged, with obvious economic benefit and environmental benefit.
Specific implementation method
Embodiment 1：Iron content, arsenic concentration are not 8.7 mg/L waste water 5L for treatment, and the valence state of arsenic in waste water is trivalent.By every mole of arsenic
Add 1.5 moles of Fe2(SO4)3；The addition of hydrogen peroxide for needed for trivalent arsenic is oxidized into pentavalent arsenic theoretical amount 150%；Every liter
Waste water adds 500mgFeAsO4;Regulation pH value is 5.0；Stirring at normal temperature reacts 50min；Stirring intensity is 100r/min.Oxidation is anti-
After should terminating, the pH value of waste water is adjusted to 6.0 with NaOH solution, continue stirring reaction 10min.After precipitation reaction terminates, stand
1.0h.Arsenic concentration in supernatant is 0.24mg/L.
Embodiment 2：The arsenic-containing waste water 100m that treatment pyrite-based sulfuric acid production is produced3/d（Composition：Arsenic 8.2mg/L, the mg/ of iron 387
L, pH1.8）.The addition of hydrogen peroxide theoretical amount needed for for trivalent arsenic is oxidized into pentavalent arsenic, oxidation of ferrous iron to ferric iron
120%；Every cubic metre of waste water adds 1.0kg dearsenification slags（Butt）;Stirring at normal temperature reacts 60min；Stirring intensity is 30r/min.
After oxidation reaction terminates, the pH value of waste water is adjusted to 7.2 with milk of lime, continue stirring reaction 15min.After precipitation reaction terminates,
2.0h is precipitated into sedimentation basin.Arsenic concentration in supernatant is 0.016mg/L.
Claims (1)
1. a kind of processing method of arsenic-containing waste water, it is characterised in that arsenic-containing waste water is sent into reactor, adds dearsenification slag, FeSO4
Or Fe2(SO4)3, hydrogen peroxide is added, every cubic metre of waste water adds the amount of dearsenification slag to be calculated as 500g~1500g, waste water with butt
In every mole of arsenic add 1.5 moles~2.5 moles FeSO4Or Fe2(SO4)3）, the addition of hydrogen peroxide is by whole arsenic in waste water
It is oxidized to pentavalent arsenic, whole iron and is oxidized to 120%~150% of theoretical amount needed for ferric iron, after the completion of charging, adjusts the pH of waste water
Value to 2~5, stirring reaction 50min~70min at normal temperatures, stirring intensity is 30 r/min~120 r/min, oxidation reaction
After end, the pH value of waste water is adjusted to 6~9 with milk of lime or NaOH solution, continue at normal temperatures stirring reaction 10min~
20min, stirring intensity be 30 r/min~120 r/min, precipitation reaction terminate after waste water enter sedimentation basin precipitation 1.0h~
3.0h, the supernatant qualified discharge of sedimentation basin is irregularly extracted sediment out from sedimentation basin and is filtered, and filtrate returns to reaction
Device, filter residue part Returning reactor, remainder is disposed by the associated specifications of dangerous disposition of solid waste.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611261242.1A CN106745652A (en) | 2016-12-30 | 2016-12-30 | The processing method of arsenic-containing waste water |
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| CN201611261242.1A CN106745652A (en) | 2016-12-30 | 2016-12-30 | The processing method of arsenic-containing waste water |
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| CN106745652A true CN106745652A (en) | 2017-05-31 |
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| CN201611261242.1A Pending CN106745652A (en) | 2016-12-30 | 2016-12-30 | The processing method of arsenic-containing waste water |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107162273A (en) * | 2017-07-03 | 2017-09-15 | 郴州钖涛环保科技有限公司 | A kind of processing method of arsenic-containing waste water |
| CN107915291A (en) * | 2017-11-17 | 2018-04-17 | 金川集团股份有限公司 | It is a kind of using waste water sink arsenic slag to copper-bath containing arsenic carry out arsenic removal method |
| CN108101258A (en) * | 2017-12-20 | 2018-06-01 | 郴州市金贵银业股份有限公司 | A kind of method of arsenic-containing waste water recycling arsenic |
| CN109607886A (en) * | 2019-02-19 | 2019-04-12 | 中国科学院过程工程研究所 | The method for innocent treatment of arsenic in a kind of arsenic-containing waste water |
| CN109621276A (en) * | 2018-11-01 | 2019-04-16 | 昆明理工大学 | A kind of method that richness iron copper ashes handles arsenic in nonferrous smelting waste acid |
| CN114180701A (en) * | 2021-11-12 | 2022-03-15 | 华中科技大学 | Method for degrading organic arsenic pollution by ferrous iron activated carbamide peroxide |
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| JP2002316173A (en) * | 2001-04-18 | 2002-10-29 | Sony Corp | Method for treating wastewater containing arsenic and hydrogen peroxide |
| CN101743203A (en) * | 2007-07-13 | 2010-06-16 | 同和金属矿业有限公司 | Method of treating diarsenic trioxide |
| CN101784489A (en) * | 2007-07-13 | 2010-07-21 | 同和金属矿业有限公司 | Method of treating arsenical matter with alkali |
| CN102531236A (en) * | 2012-01-16 | 2012-07-04 | 中国科学院沈阳应用生态研究所 | Treating method of arsenic in waste acid |
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| CN106180138A (en) * | 2016-07-15 | 2016-12-07 | 深圳市危险废物处理站有限公司 | A kind of processing method of arsenic-containing waste |
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Patent Citations (9)
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| JP2001113272A (en) * | 1999-10-20 | 2001-04-24 | Agency Of Ind Science & Technol | Method for capturing selenium or arsenic in aqueous solution |
| JP2002316173A (en) * | 2001-04-18 | 2002-10-29 | Sony Corp | Method for treating wastewater containing arsenic and hydrogen peroxide |
| CN101743203A (en) * | 2007-07-13 | 2010-06-16 | 同和金属矿业有限公司 | Method of treating diarsenic trioxide |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107162273A (en) * | 2017-07-03 | 2017-09-15 | 郴州钖涛环保科技有限公司 | A kind of processing method of arsenic-containing waste water |
| CN107915291A (en) * | 2017-11-17 | 2018-04-17 | 金川集团股份有限公司 | It is a kind of using waste water sink arsenic slag to copper-bath containing arsenic carry out arsenic removal method |
| CN108101258A (en) * | 2017-12-20 | 2018-06-01 | 郴州市金贵银业股份有限公司 | A kind of method of arsenic-containing waste water recycling arsenic |
| CN109621276A (en) * | 2018-11-01 | 2019-04-16 | 昆明理工大学 | A kind of method that richness iron copper ashes handles arsenic in nonferrous smelting waste acid |
| CN109607886A (en) * | 2019-02-19 | 2019-04-12 | 中国科学院过程工程研究所 | The method for innocent treatment of arsenic in a kind of arsenic-containing waste water |
| CN114180701A (en) * | 2021-11-12 | 2022-03-15 | 华中科技大学 | Method for degrading organic arsenic pollution by ferrous iron activated carbamide peroxide |
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Application publication date: 20170531 |