Effect Of Hydrogen Autotrophic Denitrifying Bacteria On The Mobility Of NZVI

Nanoscale zerovalent iron?nZVI?becomes one of the most available materials,because it has the specific positive features of high reactivity towards a broad range of contaminants and its potential to reduce a number of priority source zone contaminants.In order to effectively deliver nZVI to the source zone,working out the stability,mobility and the fate of nZVI in underground water is very important.So far,most studies about the mobility of nZVI are focused on water quality conditions and hydrological parameters,but the effect of microorganism cannot neglect.This purpose of this survey is going to study the effect of Ca²⁺,Na⁺and hydrogen autotrophic denitrifying bacteria?HTB?on the sedimentation of nZVI,CS-nZVI and Fe/Cu,and the effect of HTB on the mobility of nZVI,CS-nZVI and Fe/Cu,it showed that:?1?The HTB had a inhibition on the sedimentation of nZVI,CS-nZVI and Fe/Cu.With the concentration of HTB increased,the inhibition on the sedimentation of nZVI became strong,the sedimentation of CS-nZVI became slow,and the sedimentation of Fe/Cu increased first,but then decreased.Compared the three kinds of nZVI,whether added HTB,the sedimentation rate order is Fe/Cu>CS-nZVI>n ZVI.?2?The inhibition of Ca²⁺on the sedimentation of nZVI was stronger than Na⁺,the effect of Ca²⁺and Na⁺on the sedimentation of CS-nZVI were little,the inhibition of Ca²⁺on the sedimentation Fe/Cu was stronger than Na⁺.The effect of Na⁺on the sedimentation of HTB-nZVI was stronger than Ca²⁺,but CS-nZVI and Fe/Cu had opposite result.?3?The HTB promoted the mobility of nZVI,CS-nZVI and Fe/Cu.The effect of flow rate on the mobility of CS-nZVI and Fe/Cu were promoted,but rejected nZVI.