Environmental Effects of Using Chelating Agents in Polluted Sediment Remediation
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The results of laboratory scale experimental tests of contaminant extraction from marine sediment slurries are presented and discussed. The objective of this study was to compare the effectiveness of EDTA and rhamnolipid in copper removal from an artificially contaminated sediment. The comparison was made in terms of metal extraction yield, and in the evaluation of its mobilization towards the more exchangeable fractions in the sediment. Results show that, under acidic conditions established during washing, EDTA ensured higher extractions efficiencies of Cu (up to 95 %) than rhamnolipid, although there was less mobilization into bioavailable forms with the use of rhamnolipid. In addition, in the view of a biological treatment of the spent solution, the use of rhamnolipid resulted in a lower decrease of the specific oxygen uptake rate with respect to EDTA. In fact, the low surfactants concentration required, partially compensated the toxic effect of Cu towards biomass.
KeywordsSediment remediation Washing Biosurfactants Extractions Metal complexes Toxicity
This work has been partially supported by INAIL, Grant. B 01/DIPIA, Programme 2009-11 P2.
- APHA, Awwa, WEF (2005) Standard methods for the examination of water and wastewater, 21st edn. American Public Health Association, WashingtonGoogle Scholar
- Di Palma L, Ferrantelli P, Medici F (2005) Heavy metal extraction from contaminated soil: recovery of the flushing solution. J Environ Manage 77:205–211Google Scholar
- Di Palma L, Verdone N (2012) Metals extraction from contaminated soils: model validation and parameters estimation. Chem Eng Trans 28:193–198Google Scholar
- Di Palma L, Mancini D, Petrucci E (2012) Experimental assessment of chromium mobilization from polluted soil by washing. Chem Eng Trans 28:145–150Google Scholar
- Italian Environmental Regulation (2006) Environmental standards assessment, G.U.R.I. n. 88 of April 14th 2006Google Scholar
- Liu C, Evett JB (2002) Soil properties, testing, measurement, and evaluation, 5th edn. Prentice-Hall, New YorkGoogle Scholar