A mine drainage treatment system for AMD in remediation of metal sulfide mines - 论文

China?Geology?3?(2019)?396?397

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China?Geology

Journal?homepage:?http://chinageology.cgs.cn

Research?Advances?

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A?mine?drainage?treatment?system?for?AMD?in?remediation?of?metal?sulfide?mines

Shi-Tian?Houa,?b,?Jing-Yi?Caia,?b,?Ke-Yan?Tana,*,?Hong?Yangc,?Xin?Huc,?Zhe?Wanga,?d,?Xin?Yuana

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?Key Laboratory of Eco-Geochemistry, National Research Center for Geoanalysis, Ministry of Natural Resources, Beijing 100037, China?China University of Geosciences(Beijing), Beijing 100083, China

?Key Laboratory of Geotechnical and Underground Engineering of Ministry of Euducation, College of Civil Engineering, Tongji University, Shanghai 200092, China?Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, Beijing University of Technology, Beijing 100124, China

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d

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1. Objective

In?the?process?of?mining,?sorting?and?smelting?metalsulfide?mines,?a?large?amount?of?acid?mine?drainage?(AMD)containing?concentrated?sulfate?(SO42?)?and?various?metalelements?(Fe,?Mn,?Cu,?Zn,?Ni,?etc.)?are?produced.?In?order?tosolve?current?problems?of?mine?acid?drainage,?we?haveimproved?the?existing?repair?technology?based?on?bio-geochemical?technology,?and?provided?a?new?treatmentsystem?for?AMD?from?metal?sulfide?mines.2. Method

As?shown?in?Fig.?1?and?Fig.?2,?an?AMD?treatment?systemis?mainly?composed?of?5?units.?They?are?the?iron?removal?unit(1,?2,?3),?sulfate?reduction?unit?(4,?5,6),?sulfur?recovery?unit(7,8,?9),?manganese?removal?unit?(10,?11,?12)?and?endpurification?unit(13,?14,?15)?successively.?In?order?to?achievea?good?separation?and?recovery?effect,?each?unit?is?equippedwith?a?reaction?tank,?flocculation?tank?and?sedimentation?tank.All?equipment?is?distributed?from?left?to?right,?and?the?heightdifference?is?used?to?ensure?the?order?of?the?water?in?and?outof?each?process.3. Results

When?AMD?flowed?through?this?system,?firstly,?in?theiron?precipitation?unit,?Fe2+?was?oxidized?to?Fe3+?by?aerationand?hydrogen?peroxide?oxidation,?and?after?adjusting?the?pHvalue?of?the?drainage,?Fe3+?in?the?solution?formed?a?precipitateof?Fe(OH)3,?which?is?removed?by?flocculation?andprecipitation?separation.

AMDO2 and H2O2SRBO2 and SOBO2 and MOBActivesludgeMineral materialIronprecipitationunitSulfatereduction unitSulfur recycleunitManganeseremoval unitDeeppurification unitEnffluentIron-richsedimentCoppersulphide-richsedimentSulfur-richsedimentManganese-richsediment?

Fig. 1.???Schematic?diagram?of?the?acid?mine?drainage?treatment?sys-tem.

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?*?Corresponding?author:?E-mail address:?tankeyan2017@163.com?(Ke-Yan?Tan).

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doi:10.31035/cg2018112

2096-5192/??2019?China?Geology?Editorial?Office.

In?the?next?procedure,?the?release?of?sulfate-reducingbacteria?(SRB)?in?the?sulfate?oxidation?tank?reduced?SO42??toS2??in?wastewater?producing?CuS?with?Cu2+,?which?reachedan?object?to?remove?Cu2+?and?some?SO42??in?water?byflocculation?and?precipitation.

After?that,?adding?sulfur?oxidizing?bacteria?(SOB)?in?thesulfur?oxidation?tank,?oxidizing?S2??to?elemental?S?in?thesulfur?oxidation?tank?by?aeration?and?bacteria?action,?andproduced?S?was?removed?from?the?water?by?flocculationprecipitation.

Then,?aerobic?and?releasing?manganese?oxidizing?bacteriain?the?manganese?oxidation?tank?can?oxidize?Mn2+?in?thewastewater?to?insoluble?high-valence?manganese,?and?removeMn2+?in?the?wastewater?by?flocculation?and?sedimentation.