不同预处理玉米秸秆释碳特征及反硝化脱氮效果研究

Characteristics of Carbon Release from Different Pretreated Corn Stover and the Effect of Denitrification on Nitrogen Removal

摘要: 为解决低C/N微污染水体反硝化碳源不足导致的脱氮效率低问题，本研究以玉米秸秆为对象，对比不同预处理对其释碳性能及反硝化效率的影响。首先利用扫描电镜对比观察预处理前后玉米秸秆表面结构变化，同时通过静态释放实验，探究不同预处理玉米秸秆的释碳性能及氮磷释放规律；然后以不同预处理的玉米秸秆作为外加碳源，考察了其脱氮能力及反硝化速率。结果表明：不同处理后的植物材料表面粗糙程度由大到小依次为酸处理 > 碱处理 > 氧化处理；静态释放实验中酸处理玉米秸秆碳量最大，氮磷物质的释放量较低；相较于其他预处理方式，以酸处理玉米秸秆作为外加碳源的脱氮效果更好，反硝化速率更高；说明酸处理玉米秸秆是一种良好的低C/N微污染水体深度处理的反硝化碳源材料。

Abstract: In order to solve the problem of low nitrogen removal efficiency caused by insufficient denitrification carbon sources in low C/N micropolluted water, this study took corn stover as the object and compared the effects of different pretreatment on its carbon release performance and denitrification efficiency. Firstly, scanning electron microscope was used to observe the changes in the surface structure of corn stover before and after pretreatment, and at the same time, static release experiments were carried out to investigate the carbon release performance and nitrogen and phosphorus release patterns of different pretreated corn stover; then, the nitrogen removal capacity and denitrification rate of different pretreated corn stover were investigated using the corn stover as an additional carbon source. The results showed that: the surface roughness of plant materials after different treatments was acid treatment > alkali treatment > oxidation treatment in descending order; the carbon release of acid-treated corn stover was the largest in the static release experiments, and the release of nitrogen and phosphorus substances was lower; compared with other pretreatment methods, acid-treated corn stover as an additional carbon source had better nitrogen removal effect and higher denitrification rate. The results indicated that acid treatment of corn straw was a good denitrification carbon source material for advanced treatment of low C/N micro-polluted water.