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Extensive technologies for the treatment of sulphate in tailing facility effluents: from bench to the pilot plant
Claudia Ortiz, Mario Carreo and Marcela WilkensFaculty of Chemistry and Biology, University of Santiago de Chile, ChileAndre Gerth and Anja HebnerBioPlanta GmbH, Germany
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PROBLEM Mining activities generate liquid waste
containing heavy metals and high concentrations of sulphates.
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SOLUTION A strategy for the treatment of this waste is
the use of biological systems with sulphate reducing bacteria (SRB) and metal accumulating plants.
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ADVANTAGES Biological treatment of mining residual waters
is an economically interesting approach Environmentally friendly
Low energy cost
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PROPOSAL The project proposes a technological solution
consisting of a treatment system made by an anaerobic sulphate reducing system that
uses bacteria
coupled
to
an
optimized
wetland system.
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LOCATION
Second region of Antofagasta (Talabre, Chuquicamata)
Treatment of tailing facility effluents 2,800 mg/L sulphate; pH 7.0 8.0; Cu 0.5 1.0 mg/L; Mn up to 3.0 mg/L
Up to 50 m 3/day
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PARCELASDE MUESTREO
DEPRESIONCON VEGETACION
BOFEDAL NOLANA
VEGA
ENTRADA AL TRANQUE INSTALACIONES
COLA DE ZORRO
**
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2486
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TRANQUE DE RELAVE TALABRE
Q u e b r a
d a S u r
Q u
e
b
r a d
a
N o r t
e
C a m i n o a C h i u - C h i u
CARACTERIZACION DEL AREA DE ESTUDIO: TRANQUE DE RELAVE TALABRE, II REGION
ESCALA: 1: 50.000FUENTE: SERNAGEOMIN 2001, Elaboracin prpopia FONDEF D06I1097
N
TRANQUE DE RELAVE
SITIO DE INSTALACION
PILOTO WETLAND
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PARCELASDE MUESTREO
DEPRESIONCON VEGETACION
BOFEDAL NOLANA
VEGA
ENTRADA AL TRANQUE INSTALACIONES
COLA DE ZORRO
**
2515
2493
2486
2515
2486
2470
2477
2469
2481
2515
2442
2507
2459
2542
2457
2445
TRANQUE DE RELAVE TALABRE
Q u e b r a
d a S u r
Q u
e
b
r a d
a
N o r t
e
C a m i n o a C h i u - C h i u
CARACTERIZACION DEL AREA DE ESTUDIO: TRANQUE DE RELAVE TALABRE, II REGION
ESCALA: 1: 50.000FUENTE: SERNAGEOMIN 2001, Elaboracin prpopia FONDEF D06I1097
N
TRANQUE DE RELAVE
SITIO DE INSTALACION
PILOTO WETLAND
#
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#
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#
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%%
"
" ""
2445
2457
2542
2459
2507
2442
2515
2481
2469
2477
2470
2486
2515
2486
2493
2515
PARCELASDE MUESTREO
DEPRESIONCON VEGETACION
BOFEDAL NOLANA
VEGA
ENTRADA AL TRANQUE INSTALACIONES
COLA DE ZORRO
**
2515
2493
2486
2515
2486
2470
2477
2469
2481
2515
2442
2507
2459
2542
2457
2445
TRANQUE DE RELAVE TALABRE
Q u e b r a
d a S u r
Q u
e
b
r a d
a
N o r t
e
C a m i n o a C h i u - C h i u
CARACTERIZACION DEL AREA DE ESTUDIO: TRANQUE DE RELAVE TALABRE, II REGION
ESCALA: 1: 50.000FUENTE: SERNAGEOMIN 2001, Elaboracin prpopia FONDEF D06I1097
N
TRANQUE DE RELAVE
SITIO DE INSTALACION
PILOTO WETLAND
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STRATEGY
Evaluation of performance of three bacterial consortia under laboratory conditions
Bacterial strains and growth conditions Alternative carbon source
Solid matrixes Sulphate removal in synthetic MLIW
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STRATEGY Evaluation of performance of three bacterial
consortia under laboratory conditions
Bacterial strains and growth conditions Alternative carbon source Solid matrixes
Sulphate removal in synthetic MLIW
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STRATEGY Technical investigation on microbial sulphate
reduction using model systems
Bacterial growth conditions Carbon source Sulphate removal
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RESULTS Sulphate reducing activity of the SRB consortia
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RESULTS Carbon source effect on sulphate reduction C1 C2 C3
Carbon source Incubation
time (7 days)
Earthworm humus
Wheat straw + + +
Sawdust
+
Cork
Coconut fiber +
Guano
Alfalfa
Dr moss + +
White a er +
Peat +
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RESULTS Effect of the retention time and volume ratio on sulphate reduction (C1)
Experiment
Number Sand/Liquid
ratio Lactic Acid
(mg/L) Retention Time
(h) Reduced sulphate
(%)
1 1:1 30.0 10.0 10.32 1:10 90.0 10.0 14.5
3 1:1 90.0 0.50 12.5
4 1:1 90.0 10.0 13.0
5 1:10 30.0 0.50 10.9
6 1:10 90.0 0.50 14.07 1:10 30.0 0.50 11.5
8 1:1 30.0 0.50 10.5
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RESULTS Microbial sulphate reduction coupled with sulphide immobilization using reactive material in model systems
A B
C D
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CONCLUSIONS
Alternative carbon source can be used by sulphate reducing bacteria Retention time and solid matrix did not affect sulphate reduction (3 days)
but the water height has to be considered Sulphate reduction efficiency is higher in a more anaerobic system from
14 % (semi anaerobic) up to 90 % (fully anaerobic) Sulphate reduction is more efficient when working with isolated consortia
CDO is a critical parameter to be considered in the design and operation of a pilot plant.
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Usach: CORFO-INNOVA 09CN14-5795.BioPlanta: Federal Ministry of Economics and Technology,Germany