Degradation characteristics of polycyclic aromatic hydrocarbons-naphthalene and anthracene in coking wastewater by Stenotrophomonas maltophilia JWJ-Y6
Biodegradation is an effective method for the removal of polycyclic aromatic hydrocarbons,but there are still problems such as incomplete degradation and unstable degradation performance,further research on the effective-ness of bacterial removal is needed.In this study,the co-metabolic action of sodium citrate enhanced the degradation effect of Stenotrophomonas maltophilia JWJ-Y6 on naphthalene and anthracene.It provided new theoretical basis and data support for the biodegradation of coking wastewater.The optimal conditions for the degradation of naphthalene by the JWJ-Y6 were as follows:sodium citrate was used as the co-metabolic carbon source,the carbon-nitrogen ratio was 2∶1,and the pH was 8.0.Compared to before optimization,under above same conditions,the JWJ-Y6 could completely degrade naphthalene at an initial concentration of 100 mg/L at 144 h,the degradation time was shortened by 24 h;the degradation efficiency of anthracene at an initial concentration of 40 mg/L was 77.04%at 168 h,the degradation efficiency increased by 7.73%.In the treatment of coking wastewater,the JWJ-Y6 used sodium citrate as the co-metabolic substrate,and the degradation efficiencies of COD and anthracene were 77.28%and 97.35%.The metabolic pathways of the JWJ-Y6 for the degradation of naphthalene and anthracene were phthalic acid path-ways.The degradation of coking wastewater by the three ways(the JWJ-Y6,the co-metabolic action of JWJ-Y6 and sodium citrate,and the co-metabolic action of dried bacteria agents and sodium citrate)was all in line with the sec-ond-order kinetic model.
Stenotrophomonas maltophilianaphthaleneanthracenecoking wastewaterco-metabolic matrixdegradation efficiencydegradation time
万方数据
维普
