The Study On The Synergistic Repair Effect Of The Combined System Of Iron Oxide Nanomaterials And White Rot Fungus On Environmental Remediation

Recent years,white-rot fungi have been widely studied for environmental remediation by the domestic and foreign researchers due to the reason that it is less harmful to the environment than chemical technologies and it can be used in combined pollution.However,traditional biodegradation is still not widely applied in real cases because of its long period of treatment and unstable effect.Single technology can not satisfy the target of both efficiency and low risk.Nano-sized iron oxide materials with good electrical,magnetic and optical properties can effectively improve the electron transfer rate.Thus,it is widely used for environmental remediation process.Therefore,this study intends to combined the nanotechnology and traditional biodegradation process.As the nanomaterials have the advantage of large specific surface area and strong adsorption property,the addition of nanomaterials may help to improve the problem of long biodegradation cycle and instability,so as to reduce the toxicity of pollutants and shorten the repair time.This study focused on the degradation process and synergistic mechanism of combined system of iron oxide nanomaterials and white rot fungus on organic matter under different environmental conditions.The specific research contents include the following two experiments:(1)Study on the synergistic degradation of lignocellulosesIn order to figure out the potential mechanism of the combined system on lignocelluloses degradation,different concentrations of iron oxide nanomaterials were added during the lignocellulose solid-state fermentation of white-rot fungus.During the fermentation,the key parameters such as extracellular enzyme activity and free radical content were monitored,it is found that nanomaterials promoted the biodegradation process.Through FTIR characterization and determination of humic acid of the straw sample,the results demonstrated the structural change of lignocellulose.Based on the above findings,a Fenton-like reaction mechanism was proposed,which laid a foundation for further study on the degradation capacity of the combined system for further environmental remediation.(2)Study on the synergistic degradation of Phthalate Acid EstersThe degradation ability of indigenous microbial on organic pollutants is usually affected by sediment environment.Besides,it may take a long time for indigenous microbial to achieve complete degradation.Therefore,the synergistic effect of the combined system of iron oxide nanomaterials and white rot fungus was further investigated by treating Phthalate Acid Esters in real sediment environment.The removal rate of target pollutant,the bioactivity of both white rot fungus and indigenous microorganisms and the transformation of nanomaterials were detected to elucidate the repair mechanism of the combined system.The results showed that the removal rate of DEHP in the experimental group reached 96.63% within 45 days.This indicates that the coupled remediation technology,which integrates adsorption and biodegradation,is expected to be applied to the removal of Phthalate Acid Esters from the sediment.