CN106698632A - Treatment method of mercury-containing wastewater - Google Patents

Treatment method of mercury-containing wastewater Download PDF

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Publication number
CN106698632A
CN106698632A CN201611255823.4A CN201611255823A CN106698632A CN 106698632 A CN106698632 A CN 106698632A CN 201611255823 A CN201611255823 A CN 201611255823A CN 106698632 A CN106698632 A CN 106698632A
Authority
CN
China
Prior art keywords
waste water
mercury
slag
demercuration
thioacetamide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201611255823.4A
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Chinese (zh)
Inventor
龙炳清
刁剑
曾凡芸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Normal University
Original Assignee
Sichuan Normal University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan Normal University filed Critical Sichuan Normal University
Priority to CN201611255823.4A priority Critical patent/CN106698632A/en
Publication of CN106698632A publication Critical patent/CN106698632A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62—Heavy metal compounds
    • 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
    • C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
    • C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/046—Recirculation with an external loop

Abstract

A treatment method of mercury-containing wastewater, disclosed in the invention, is characterized in that mercury in wastewater is precipitated under a mercury residue removal provided nucleation condition under the action of ultrasonic waves by using thioacetamide and sodium sulfide as a precipitating agent. Treated wastewater is discharged after stably reaching standards.

Description

The processing method of mercury-containing waste water
Technical field
The present invention relates to a kind of processing method of mercury-containing waste water.
Background technology
Mercury is important industrial raw materials, and mercury-containing waste water can be produced in its extraction, chemicals production and use.The poison of mercury Property is very big.If mercury-containing waste water is not processed and enters environment, it will cause Heavy environmental pollution.The processing method master of current mercury-containing waste water There are chemical precipitation method, absorption method and membrane separation process etc..Wherein chemical precipitation method is most widely used due to low cost.Due to relating to The level of clean production of mercury industry is generally improved, and the mercury concentration in waste water is also more and more lower（A few mg/litre~tens milligram/ Rise）, the sediment for thereby resulting in chemical precipitation method generation is very thin, and the also generation colloidal substance having, separation of solid and liquid is difficult, makes treatment Waste water afterwards is difficult to stably reaching standard discharge.The mercury-containing waste water that exploitation mercury removal effect is good, simple to operate, demercuration slag is easily processed Processing method has larger practical value.
The content of the invention
For the problem that the treatment of current mercury-containing waste water is present, the purpose of the present invention is that searching mercury removal effect is good, operates letter The processing method of the mercury-containing waste water that single, demercuration slag is easily processed, it is characterised in that mercury-containing waste water is sent into reactor.Add demercuration Slag, every cubic metre of waste water adds the amount of demercuration slag to be calculated as 500g~1500g with butt.After stirring, the pH value of waste water is adjusted To 6~8.Hereafter while adding thioacetamide and vulcanized sodium, the addition of thioacetamide and vulcanized sodium is respectively waste water Middle whole mercury and other metal ion reactions that can generate sulfide precipitation generate 3%~5% He of theoretical amount needed for sulfide 100%~110%.After the completion of charging, stirring reaction 8min~15min under normal temperature and ul-trasonic irradiation, stirring intensity is 20 r/ Min~30 r/min, the power of every cubic metre of waste water input ultrasonic wave is 2kW~6kW.Waste water after precipitation reaction terminates enters Sedimentation basin precipitates 1.0h~3.0h.The supernatant qualified discharge of sedimentation basin.Irregularly extracting sediment out from sedimentation basin was carried out Filter, filtrate Returning reactor, filter residue（Demercuration slag）Part Returning reactor, remainder comprehensive utilization, or by dangerous solid The associated specifications of waste treatment are disposed.
The object of the present invention is achieved like this, main to occur such as after mercury-containing waste water adds thioacetamide and vulcanized sodium Lower reaction：
CH3CSNH2 + H2O + Hg2+ = CH3CONH2 + HgS +2H+
Hg2++ Na2S = HgS + 2Na+
CH3CSNH2 + H2O + 2Hg+ = CH3CONH2 + Hg2S +2H+
2Hg+ + Na2S = Hg2S + 2Na+
By above-mentioned series reaction, the mercury in solution is with HgS and Hg2The form of S precipitations is removed, and reaches waste water and goes the removal of mercury Purpose.
The core of this method is that the return of demercuration slag part is used, there is provided HgS and Hg2S good nucleating condition, it is to avoid generation The fine grained HgS and Hg of hardly possible precipitation2S；It is used in conjunction with thioacetamide and vulcanized sodium makees precipitating reagent, can both ensures the removal effect of mercury Really, the generation of colloidal substance can be avoided again, thus improve HgS and Hg2The precipitation and separation of solid and liquid performance of S, after guarantee treatment Waste water stably reaching standard is discharged.
Using the effect of ultrasonic wave be to speed up reaction mass transport process, while ultrasonic wave also has some improvement HgS and Hg2The effect of the settling property of S.
Experiment shows：When waste water of the mercury concentration less than 20mg/L is processed, under equal conditions, demercuration slag is added without, particle diameter is small In 1 micron of sediment about 15% or so, precipitate poor performance, processed waste water is unable to qualified discharge；Add de- After mercury 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.
Experiment shows：When the waste water that mercury concentration is 20mg/L is processed, thioacetamide is used alone, even if its addition It is the 300% of theoretical amount, the concentration of the mercury in solution is still above 6mg/L；When vulcanized sodium is used alone, contain in the slag of generation A large amount of colloidal substances, it is difficult to carry out separation of solid and liquid；When both are used in combination, both can depth go the removal of mercury, the precipitation of sediment and Strainability is also fine.
Relative to existing method, the present invention makees " nucleator ", substantially improves HgS and Hg using demercuration slag2The precipitation bar of S Part, significantly increases the particle diameter of these sediments；It is used in conjunction with thioacetamide and vulcanized sodium makees precipitating reagent, can both ensures mercury Removal effect, can avoid the generation of colloidal substance, HgS and Hg again2S can rapid precipitation, sediment strainability in sedimentation basin Well, so as to ensure the waste water stably reaching standard discharge after treatment, with obvious economic benefit and environmental benefit.
Specific implementation method
Embodiment 1：Treatment simulated wastewater 50L（Composition：Hg12.3mg/L、pH1.8）.Treatment conditions：Every liter of waste water adds demercuration The addition of slag 1000mg, thioacetamide and vulcanized sodium be respectively theoretical amount 3% and 105%, precipitation reaction time 8min, PH6, mixing speed 30r/min, every liter of ultrasonic power of waste water of input are 4W, sedimentation time 1.0h.Waste water after treatment into It is divided into：Hg0.0004mg/L、pH6.8.
Embodiment 2：Daily treatment of laboratory waste water 20m3（Composition：Hg3.2mg/L, pH2.2,）.Treatment conditions：Every cube It is anti-that rice waste water adds the addition of demercuration slag 1200g, thioacetamide and vulcanized sodium to be respectively 5% and the 100% of theoretical amount, precipitation 10min, pH6.5, mixing speed 20r/min, every cubic metre of ultrasonic power of waste water of input are 2kW, sedimentation time between seasonable 2.0h.Waste component after treatment is：Hg0.0003mg/L、pH7.1.
Embodiment 3：Treatment mercury smelts water seal and washes 50L（Composition：Hg 315mg/L、pH3.1）.Treatment conditions： Every liter of waste water adds the addition of demercuration slag 500mg, thioacetamide and vulcanized sodium to be respectively 4% and the 108% of theoretical amount, precipitation Reaction time 15min, pH6.5, mixing speed 20r/min, every liter of ultrasonic power of waste water of input are 3W, sedimentation time 1.0h.Waste component after treatment is：Hg0.0006mg/L、pH7.6.

Claims (1)

1. a kind of processing method of mercury-containing waste water, it is characterised in that mercury-containing waste water is sent into reactor, adds demercuration slag, often stands Square rice waste water adds the amount of demercuration slag to be calculated as 500g~1500g with butt, after stirring, adjusts the pH value of waste water to 6~8, Hereafter while adding thioacetamide and vulcanized sodium, the addition of thioacetamide and vulcanized sodium is respectively whole mercury in waste water 3%~5% and 100%~110% of theoretical amount needed for the metal ion reaction generation sulfide of sulfide precipitation can be generated with other, After the completion of charging, stirring reaction 8min~15min under normal temperature and ul-trasonic irradiation, stirring intensity is 20 r/min~30 r/ Min, the power of every cubic metre of waste water input ultrasonic wave is 2kW~6kW, and the waste water after precipitation reaction terminates is precipitated into sedimentation basin 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 Reactor, filter residue part Returning reactor, remainder comprehensive utilization, or by the correlation technique of dangerous disposition of solid waste Specification is disposed.
CN201611255823.4A 2016-12-30 2016-12-30 Treatment method of mercury-containing wastewater Pending CN106698632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611255823.4A CN106698632A (en) 2016-12-30 2016-12-30 Treatment method of mercury-containing wastewater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611255823.4A CN106698632A (en) 2016-12-30 2016-12-30 Treatment method of mercury-containing wastewater

Publications (1)

Publication Number Publication Date
CN106698632A true CN106698632A (en) 2017-05-24

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CN201611255823.4A Pending CN106698632A (en) 2016-12-30 2016-12-30 Treatment method of mercury-containing wastewater

Country Status (1)

Country Link
CN (1) CN106698632A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1548381A (en) * 2003-05-08 2004-11-24 财团法人工业技术研究院 Method of removing As from water
CN1686870A (en) * 2005-03-31 2005-10-26 苏州市环境工程有限责任公司 Technique for processing reclamation of industrial wastewater from printing electronic circuit board
CN1919755A (en) * 2006-09-15 2007-02-28 合肥工业大学 Method of processing organic contaminant waste-water difficult to biochemical degradation using tetravalent manganese compounds
CN101693574A (en) * 2009-09-09 2010-04-14 湖南浩美安全环保科技有限公司 Method for treating waste water with high pH value, high sulfide content, high ammonia nitrogen content and high COD content
CN101928083A (en) * 2010-09-28 2010-12-29 同济大学 Method for treatment of wastewater containing heavy metal molybdenum
CN102010086A (en) * 2010-12-01 2011-04-13 新疆天业（集团）有限公司 Method for treating mercury-containing wastewater with three-section continuous process
CN103011439A (en) * 2011-09-20 2013-04-03 无锡尚德太阳能电力有限公司 Cadmium-containing wastewater treatment method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1548381A (en) * 2003-05-08 2004-11-24 财团法人工业技术研究院 Method of removing As from water
CN1686870A (en) * 2005-03-31 2005-10-26 苏州市环境工程有限责任公司 Technique for processing reclamation of industrial wastewater from printing electronic circuit board
CN1919755A (en) * 2006-09-15 2007-02-28 合肥工业大学 Method of processing organic contaminant waste-water difficult to biochemical degradation using tetravalent manganese compounds
CN101693574A (en) * 2009-09-09 2010-04-14 湖南浩美安全环保科技有限公司 Method for treating waste water with high pH value, high sulfide content, high ammonia nitrogen content and high COD content
CN101928083A (en) * 2010-09-28 2010-12-29 同济大学 Method for treatment of wastewater containing heavy metal molybdenum
CN102010086A (en) * 2010-12-01 2011-04-13 新疆天业（集团）有限公司 Method for treating mercury-containing wastewater with three-section continuous process
CN103011439A (en) * 2011-09-20 2013-04-03 无锡尚德太阳能电力有限公司 Cadmium-containing wastewater treatment method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王绍文等: "《冶金工业节水减排与废水回用技术指南》", 31 October 2013, 冶金工业出版社 *

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Application publication date: 20170524