玉米芯与秸秆作为缓释碳源的改性研究

Study on Modification of Corncob and Straw as Slow-release Carbon Sources

目的 为解决低C/N污水中碳源不足的问题,探究以玉米芯与秸秆作为固体缓释碳源的可能性。方法 分别使用NaOH溶液、H2O2溶液及NaOH与H2O2的混合液对玉米芯与秸秆进行改性,通过静态试验测定改性后固体碳源的质量变化,分析改性后固体碳源的浸出液中COD、NH_(4)^(+)-N、TN、TP的释放规律,对改性后固体碳源的可生化性能进行研究。结果 经过预处理后的固体碳源释碳能力均有不同程度的提升,经过碱处理组的质量减少最为明显,经过碱处理后的玉米芯具有良好、持久的释碳能力,氮磷的释放量几乎可忽略不计,经过碱处理后的玉米芯和秸秆的可生化性均有所提高,玉米芯的可生化性能增强更明显,更适合微生物的生长繁殖。结论 经过碱性溶液处理后的玉米芯更适于作为固体缓释碳源应用于低C/N污水的脱氮除磷。

In order to solve the problem of insufficient carbon source in low C/N wastewater treatment,the carbon,nitrogen and phosphorus release characteristics and the biochemical performance of corncob and straw treated by different modification methods were studied as solid slow-release carbon source.The modification reagents are NaOH solution,H 2O 2 solution and the admixture of the former two.After modification,mass change of solid carbon source,the release law of COD,NH_(4)^(+)-N,TN and TP in the leaching solution were continuously determined and analyzed by static test.The carbon release capacity of the pretreated solid carbon source is improved to varying degrees,and the quality reduction of alkali treatment group was the most obvious among them.The corncob with alkali treatment has good and lasting carbon release capacity,and has the almost negligible release of nitrogen and phosphorus.The biodegradability of corncob and straw after alkali treatment was improved,and the biodegradability of corncob was more obvious,which is more suitable for microbial growth and reproduction than that of straw.So the corncob treated with alkaline solution is more suitable as a solid slow-release carbon source for nitrogen and phosphorus removal of low C/N wastewater.