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Nowadays, the main method applied to remediate As contaminated soil is excavation
and landfilling. Soil treatments normally are implemented under aerobic conditions.
This study was conducted to investigate the possibility of stabilizing As in reducing
conditions by adsorption to and co-precipitation with Fe-sulphides or formation of
amorphous As-S phases. The sulphide formation is considered to result from the activity
of sulphate reducing bacteria (SRB) present in sludge as a part of their metabolism. The
bacteria produce sulphide by reducing sulphate and oxidizing organic compounds.
A total of 36 bottles were prepared, 18 of them are considered as sample bottles and did
not contain sludge or Na-lactate (organic source) together with soil. The bottles
amended with sludge contained 4.5 g/l of sulphate and 3.5 g/l of Na-lactate.
The results showed that the concentration of dissolved As was dramatically higher in
the bottles amended with sludge, probably due to insufficient SRB activity or the
necessity of having a longer-term experiment.
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