不同改性方式对控释碳源材料脱氮性能的影响

以玉米淀粉(S)为碳源,聚乙烯醇(P)为骨架载体,根据是否用硼酸(B)和硫酸钠(N)做改性处理,制备了GSP、GSP-N、GSP-B和GSP-BN 4种控释碳源材料,研究N、B和BN 3种改性方式对碳源材料脱氮性能的影响。在添加4种碳源的静态实验中,硝酸盐氮去除率均在96.1%以上。碳源材料的改性对硝酸盐氮的降解情况影响不明显,但对脱氮过程中TOC、亚硝酸盐氮、氨氮和TN浓度的变化有不同程度的影响。以TOC、亚硝酸盐氮、氨氮和TN为指标,N、BN和B 3种改性方式综合效益指数分别为5.62、4.6和1.92,硫酸钠(N)改性处理对提高控释碳源材料整体性能具有最佳效果。

Influence of different modified methods on denitrification performance of controlled-release carbon-source materials

Four types of controlled-release carbon source materials GSP, GSP-N, GSP-B and GSP-BN were prepared by using corn starch(S) as carbon source and polyvinyl alcohol(P) as vector,and depending on whether modifying with boric acid (B) or sodium sulfate(N). The influences of three methods modified by N, B and B+N on denitrification performance of carbon-source materials were investigated. Nitrate removal rates are all above 96.1% when adding these four carbon-sources in a static experiment. Modification of carbon-sources has little effect on denitrification, while it has significant effects on TOC, nitrite, ammonia and TN in nitrogen-removal process. With concentrations of TOC, nitrite, ammonia and TN as indicators, MCEI of N, B, and B+N methods are 5.62, 4.6 and 1.92, respectively, and N is the most effective modified method.