用作固定SRB碳源的玉米芯的最佳改性条件

针对现阶段玉米芯作为SRB污泥颗粒内聚碳源所带来碳源释放不佳的问题，选用碱性H2O2对玉米芯进行改性，制备成SRB污泥颗粒处理AMD，经过单因素实验和正交实验分析，对玉米芯的最佳改性条件进行研究。结果表明，当玉米芯改性时间24 h，NaOH浓度为6%，H2O2浓度为1.5%，可制得最佳改性玉米芯。制备成SRB污泥颗粒处理AMD后，SO42-、Mn2+和Fe2+去除率分别为93%、78%和95%，较未改性提高了29%、3%和23%；COD释放量为215 mg·L-1，较未改性减少了545 mg·L-1；Fe2+剩余量为1.5 mg·L-1，较未改性减少了1.1 mg·L-1；溶液pH为7.8。同时经SEM和XRD分析，发现改性玉米芯颗粒较未改性玉米芯颗粒相比，内部结构变得的疏松多孔，且大分子物质被分解为小分子物质，可以更好被SRB所利用。说明了该改性法可以改善玉米芯的碳释性能，为微生物处理AMD的工程应用提供技术参考。

Best conditions of modification about corncob as SRB fixed carbon source

Simple corncobs,as a fixed source of SBR sludge particles,can presently be used to meet the problem of improper release of carbon. The corncobs are modified using alkaline H2O2,to prepare SRB immobilized particles to treat AMD. We studied the optimal conditions for modification of corncobs for this purpose. The results showed that when the corn cob modification time was 24 h,NaOH concentration was 6%,and the concentration of H2O2 was 1.5%,we could get the best modified corn cobs and prepared SRB sludge particles. The removal rates of SO42-,Mn2+,and Fe2+ were 93%,78%,and 95%,respectively,in comparison with unmodified materials,increases of 29%,3%,and 23%. The COD emission was 215 mg·L-1,compared with unmodified material,a reduction of 545 mg·L-1. The remaining amount of Fe2+ was 1.5 mg·L-1,compared with unmodified materials,a reduction of 1.1 mg·L-1;the pH is 7.8. Analysis using SEM and XRD showed that the internal structure of the modified corncobs became loose and porous,and that large molecules were broken down into smaller molecules,compared to unmodified corncobs. Therefore,the modified corncobs were better for use by SRB. This method for modification can greatly improve the release properties of corncob carbon,and provide a technical reference for microbial treatment of AMD engineering applications.