2种缓释碳源材料的释碳特性及脱氮性能研究

Study on Carbon Release Properties and Denitrification Performances of Two Slow-Release Carbon Sources Materials

以农业废弃物竹粉﹑荔枝核粉未作为碳源,聚乙烯醇(PVA)和海藻酸钠(SA)作为骨架载体,利用硼酸-硼砂二次交联的方法将2种碳源分别固定在PVA-SA载体中,制备2种新型缓释碳源材料:竹粉-PVA-SA(BPS)和荔枝核粉末-PVA-SA(LPS),研究了二者的释碳特性和脱氮性能。结果表明,BPS和LPS的释碳过程皆满足一级动力学方程,相较于BPS,LPS释放的TOC量更高,最高达56.08 mg/g,其表面结构也较粗糙,更利于微生物附着;LPS脱氮性能强于BPS,8 d后系统达到最高NO,-N去除率100%,而BPS系统可达到最高NO^-3-N去除率仅为21.3%,LPS系统平均反硝化速率为30.65 g/(m^3·d),远高于BPS系统的4.83 g/(m^3·d),且.LPS材料释放的碳源更易被微生物利用。

The bamboo power-PVA-SA(BPS)and lychee seed power-PVA-SA(LPS)slow-release carbon sources were prepared using agriculturalwastes bamboo power and lychee seed power as carbon sources wih polyvinyl alcohol(PVA)and sodium alginate(SA)as framework carrier and usingborc ai-borax secondary rss-Jinking to fix the two carbon sourcs in the PVA-SA carriers,respectively.The carbon release propertics and denitrificationperformances of the two materals were stdied.The result showed that,the carbon release process of BPS and LPS were followed the first-order kineticcquation and the release of TOC in LPS was higer than in BPS,is highest was 56.08 mg/g.The surface structure of LPS was also rougher,which wasmore conducive to the attachment of microorganisms.The LPS provided better denitrification efficiency than BPS,it reached the highest nitrate removalrate of 10%after 8,but the highest nitrate removcl of BPS wasjust 21.3%.The average denitrification rate of LPS system was 30.65 g(m^3·d),it washigher than 4.83g(m^3·d)of BPS system,and the carbon source released by the LPS material was more easily used by microorganisms.