Bi Biol oleachi eaching of of fly fly ash ash and and bot bottom - - PowerPoint PPT Presentation

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bi biol oleachi eaching of of fly fly ash ash and and bot
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Bi Biol oleachi eaching of of fly fly ash ash and and bot bottom - - PowerPoint PPT Presentation

Jan 09, 2023 21 likes •162 views

Bi Biol oleachi eaching of of fly fly ash ash and and bot bottom om ash ash fr from om Muni Munici cipal pal Solid lid Wa Waste In Incin cineratio tion fo for met metal re reco cove very V. Funari, H. I. Gomes , M. Cappelletti, S.

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SLIDE 1

Bi Biol

  • leachi

eaching of

  • f fly

fly ash ash and and bot bottom

  • m ash

ash fr from

  • m Muni

Munici cipal pal Solid lid Wa Waste In Incin cineratio tion fo for met metal re reco cove very

  • V. Funari, H. I. Gomes, M. Cappelletti, S. Fedi, E. Dinelli, M. Rogerson, W. M. Mayes
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SLIDE 2

Potential for metal recovery

Funari et al. (2015). Waste Management, 45: 206‐216

Major elements output in tons per year Market Price Euro per kilograms Transfer Coefficients

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SLIDE 3

Trace elements output in kilograms per year Market Price Euro per kilograms Transfer Coefficients

Funari et al. (2015). Waste Management, 45: 206‐216

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SLIDE 4

Bio what?

https://goo.gl/sZyuRe

http://www.mintek.co.za/

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SLIDE 5

Objectives

  • How to transform BAs and FAs into a

low grade urban mine?

  • Bioleaching applied to MSWI residues
  • Start‐point optimisation
  • Metal recovery?

http://www.ceh.com.sg/

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SLIDE 6

Acidophilic mixed culture

Enriched from sulphidic ore mines

Libiola ore deposit  Cu Funari et al. (in progress)

  • At. ferrooxidans

Acidithiobacillus sp. Acidovarax sp. Delftia acidovorans Chlorobium limicola Actinobacteria Proteobacteria Thermophilic bacillus sp.

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SLIDE 7

Activation

0.00 0.50 1.00 1.50 2.00 2.50

15/05/2016 20/05/2016 25/05/2016 30/05/2016 04/06/2016

pH

Time

biofilm + nutrients (shake flasks)

Precultivation / adaptation 1% pulp density 5% pulp density 10% pulp density Bioleaching

  • ptimisation

Manual pH adjusting pH 2.2 pH 3 pH 3 2 L reactor ≠ FeII ≠ S0 ≠ pH (3 vs 6) Ion exchange resins for metal recovery

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SLIDE 8

10 20 30 40 50 60 70 80 90 100

Al Cr Cu Zn Co Sn

R % Bottom ash

setpoint pH 3 22 g/L iron(III) 0 g/L iron(III)

Optimisation

With or without FeII

Pulp density, rot. speed, T SAME Inoculum SAME Elemental sulphur SAME Iron sulphate heptahydrate DIFFERENT

Pb

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SLIDE 9

Optimisation

with 5 or 10 g L‐1 S0

10 20 30 40 50 60 70 80 90 100

Al Cr Cu Zn Co Sn

R % Fly ash

setpoint pH 3 5g/L sulphur 10g/L sulphur

Pulp density, rot. speed, T SAME Inoculum SAME Elemental sulphur DIFFERENT Iron sulphate heptahydrate SAME

Pb

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SLIDE 10

10 20 30 40 50 60 70 80 90 100

Al Cr Cu Zn Co Sn

R % Fly ash

setpoint pH 6 acidophilic acidophilic + alkalinophilic

Optimisation

pH set point

Pulp density, rot. speed, T SAME Inoculum DIFFERENT Elemental sulphur SAME Iron sulphate heptahydrate SAME

Pb

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SLIDE 11

Metal Recovery

CHELEX vs. AMBERLITE

1 2 3 4 5 6 7 8 9 10

Al Co Cr Cu Pb Zn Metal Recovery %

CHELEX AMBERLITE

10 20 30 40 50 60 70

Sb Pr Gd Ho Er Metal Recovery %

CHELEX AMBERLITE

BA sample 10% pulp density

  • ne‐step bioleaching

+ batch test for metal recovery (from the bioleachate)

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SLIDE 12

Process design

1M H2SO4 solution in 7 days using: 10 g/L S0 4.2 g/L other salts

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SLIDE 13
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SLIDE 14

Ta Take hom home messag ssages

  • Recovery is challenging – market can be an obstacle
  • Bioleaching can remove metals from fly ash and bottom ash
  • Further research needed for isolate metals

helena.gomes@nottingham.ac.uk @HelenaIGomes