Surfactant-aided soil washing is often pro posed far the restoration of aged organic poltutant eontaminated soils. As many a commercial surfactants have been found to be toxic and recalcitrant, the opportunity to use in this process cheap, non-toxic, and biodegradable pollutant-mobilizing agents, such as deoxycholic acid (DA), bovine bile (BB). and the residue resulting tron DA extraction from BB (BBR), was studied in this work. A soil historically contaminated by chiari nated anilines and benzenes, thiophenes, and several polycyclic arornatic hydrocarbons was suspended at 15% wfv and washed in water or water amended at 1.0% (wlv) with DA, BB, BBR, or Triton X-100 (TX). The resulting effluents were supplernented with nutrients and sub jected to aerobic bioremediation. The biogenic agents enhanced the water pollutant elution potential by 230/ 440%. DC enhanced the same parameter by about 540%; however, it mediated a lower depletion of the initial soil ecotoxicity and a more extensive mobilization of soil constituents with respect to the biogenic agents. Further more,TX adverselyaffected the biotreatabilityofresulting effluents, by adversely aftectirig the growth a cultivable bacterial biomass and the structure of eubacterial corì munity of the effluent. On the contrary, the biogenic agents, and in particular DA and BB, enhanced the eftluents bioremediation, by sustaining the growth and increasing the complexity of the effluent eubacterial communities. Thus, DA and BB are very promising additives for an effective and environrnental friendly soil washing treatment of aged (chloro)organics contanti nated soils.
Development and assessment of an innovative soil-washing process based on the use of cholic acid-derivatives as pollutant-mobilizing agents
MEDICI, Alessandro;
2006
Abstract
Surfactant-aided soil washing is often pro posed far the restoration of aged organic poltutant eontaminated soils. As many a commercial surfactants have been found to be toxic and recalcitrant, the opportunity to use in this process cheap, non-toxic, and biodegradable pollutant-mobilizing agents, such as deoxycholic acid (DA), bovine bile (BB). and the residue resulting tron DA extraction from BB (BBR), was studied in this work. A soil historically contaminated by chiari nated anilines and benzenes, thiophenes, and several polycyclic arornatic hydrocarbons was suspended at 15% wfv and washed in water or water amended at 1.0% (wlv) with DA, BB, BBR, or Triton X-100 (TX). The resulting effluents were supplernented with nutrients and sub jected to aerobic bioremediation. The biogenic agents enhanced the water pollutant elution potential by 230/ 440%. DC enhanced the same parameter by about 540%; however, it mediated a lower depletion of the initial soil ecotoxicity and a more extensive mobilization of soil constituents with respect to the biogenic agents. Further more,TX adverselyaffected the biotreatabilityofresulting effluents, by adversely aftectirig the growth a cultivable bacterial biomass and the structure of eubacterial corì munity of the effluent. On the contrary, the biogenic agents, and in particular DA and BB, enhanced the eftluents bioremediation, by sustaining the growth and increasing the complexity of the effluent eubacterial communities. Thus, DA and BB are very promising additives for an effective and environrnental friendly soil washing treatment of aged (chloro)organics contanti nated soils.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
