总氮超标的微污染水体中有机碳源较少, 投加外部碳源可促进反硝化脱氮, 固体碳 源因能克服传统碳源缺点而备受关注. 以农业废弃物玉米芯和高分子材料作为碳源, 以聚乙 烯醇和海藻酸钠作为骨架载体, 利用交联法制备 2 种复合固相碳源 PSPC-Ⅰ和 PSPC-Ⅱ, 并 研究释碳特性及强化生物绳脱氮效果. 结果表明, 28 d 内两种固相碳源持续释碳且未达到释 碳平衡, 最高释碳量分别达 6.3 和 8.7 mg/g (以溶解性有机碳计); 三维荧光结果显示释放碳 源以微生物易降解的可溶性微生物代谢产物和芳香蛋白类物质为主; 与不投加碳源的生物绳 (生物量 6 200 ng/g, 以三磷酸腺苷计) 相比, 2 种固相碳源均显著增加了生物绳挂膜生物量 (PSPC-Ⅰ和 PSPC-Ⅱ的生物量分别为 400∼600 和 300∼500 ng/g, 以三磷酸腺苷计); 2 种固 相碳源均显著增强了反硝化作用, 对照组未脱氮, 2 种固相碳源脱氮率达 80.4% 和 75.0%.

There are few organic carbon sources in micro-polluted water with excessive total nitrogen. Adding an external carbon source can promote denitrification to remove nitrogen. Solid carbon sources have attracted attention because they overcome the shortcomings of the traditional carbon source. In this study, two solid carbon sources, PSPC-Ⅰ and PSPC-Ⅱ, were prepared by cross-linking, using agricultural waste corncob and polymer materials as carbon sources and polyvinyl alcohol and sodium alginate as skeleton carriers. The carbon release characteristics of the two solid carbon sources and their enhanced denitrification effect were studied. The results showed that the two solid carbon sources released carbon continuously and did not reach carbon release equilibrium within 28 days. The maximum carbon release values of PSPC-Ⅰ and PSPC-Ⅱ were 6.3 and 8.7 mg/g (calculated via the dissolved organic carbon (DOC)), respectively. Three-dimensional fluorescence results showed that the released carbon sources were mainly soluble microbial metabolites and aromatic proteins that were easily degraded by microorganisms. In comparison with the biological rope without an added carbon source (6 200 ng/g, calculated via the adenosine triphosphate (ATP)), both solid carbon sources significantly increased the biomass of biological rope biofilm (PSPC-Ⅰ: 400∼600 ng/g, PSPC-Ⅱ: 300∼500 ng/g). Additionally, both solid carbon sources significantly enhanced denitrification. The control group did not produce denitrification, but the denitrification rates of the two solid carbon sources were as high as 80.4% and 75.0%, respectively.