Effects of cyclodextrins, humic substances, and rhamnolipids on the washing of a historically contaminated soil and on the aerobic bioremediation of the resulting effluents

Biotechnology and Bioengineering
Sara BerselliFabio Fava

Abstract

Nontoxic and biodegradable pollutant-mobilizing agents, instead of chemical surfactants, were tested in the washing of an actual-site chloroaromatic-contaminated soil. A soil historically contaminated by chlorinated anilines and benzenes, thiophenes and several polycyclic aromatic hydrocarbons was subjected to washing by suspending it (15% w/v) in water or in water with 1.0% (w/v) beta-clodextrin (beta-CD), hydroxypropyl-beta-cyclodextrin (HP-beta-CD), rhamnolipid (RL), dissolved humic substances (HS), or Triton X-100 (TX) in shaken batch reactors for 24 hr. The resulting wastewaters were amended with nutrients and treated aerobically in shaken reactors for 65 days. The biogenic agents markedly enhanced (by 237%, beta-CD; 265%, HP-beta-CD; 400%, RL; 566%, HS) the capability of water of eluting organic pollutants from the soil. TX enhanced the overall pollutant removal by about 660%; however, a lower depletion of the initial soil ecotoxicity, along with a more extensive impact on the soil organic matter, was observed. Furthermore, TX adversely affected the bioremediation of the resulting effluent by apparently inducing a premature decrease of specialized bacterial biomass. By contrast, the biogenic agents, and in particular HS a...Continue Reading

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Citations

Dec 1, 2006·Applied Microbiology and Biotechnology·Alessandro D'AnnibaleMaurizio Petruccioli
Sep 8, 2007·Applied Microbiology and Biotechnology·Ermanno FedericiMaurizio Petruccioli
Jun 9, 2005·Current Opinion in Microbiology·Saïd El Fantroussi, Spiros N Agathos
Dec 29, 2015·Journal of Hazardous Materials·Clément TrelluMehmet A Oturan
Feb 2, 2010·Waste Management·Kristin Elgh DalgrenPatrick A W van Hees
Oct 6, 2009·Journal of Hazardous Materials·Bhargavi SubramanianDionysios D Dionysiou
Aug 12, 2009·Ecotoxicology and Environmental Safety·Beatriz MorenoEmilio Benitez
Aug 25, 2009·Journal of Hazardous Materials·Kristin Elgh-DalgrenPatrick A W van Hees
Jul 4, 2015·Environmental Science and Pollution Research International·Muhammad ArslanMuhammad Afzal
Apr 29, 2005·Biotechnology and Bioengineering·Alessandro D'AnnibaleMaurizio Petruccioli
Oct 4, 2014·Environmental Science. Processes & Impacts·O U OgbonnayaK T Semple

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