Aerobic Degradation of Lindane in Clay Soil with High Organic Matter Content in a Triphasic Slurry Bioreactor

摘要

Because of its toxicity, persistence, and bioaccumulaton potential the use of the pesticide lindane has been prohibited or restricted. Its high hydrophobicity is linked to its great adsorption to organic matter and low bioavailability to microorganisms, thus precluding effective degradation. The use of tri-phaisc soil bioreactors might increase the transfer of sorbed lindane from soil to the aqueous phase, thus improving its availability for biological degradation. The solvent silicone oil has been shown to increase lindane desorption from soil, and meets the required characteristics such as biocompatibility, recalcitrant to biodegradation, and chemical stability and reuse. On the other hand, stimulation of bioremediation by use of a co-substrates and bioaugmentation, can lead to increased degradation of a variety of xenobiotics. Therefore, the objective of this study was to evaluate the effect of co-substrate supplementation and the synergistic effect of the native population and a lindane- acclimated inoculum on the removal of lindane in threephase, aerobic slurry bioreactors.