中文摘要：

碳源在生物硝酸盐去除过程中起着重要的提供电子供体的作用,因此是生物反硝化的核心物质之一.选出玉米芯、稻壳、稻草、木屑4种农业废弃物做为反硝化碳源和生物膜载体,研究了4种碳源物质的释碳规律及外界因子对其释碳能力的影响.结果表明,4种碳源材料的释碳过程均满足二级动力学方程;比较而言,稻草的有机物释放量最大,释放速率也最快,24 h内溶液COD浓度就超过了30 mg/（g.L）;木屑的有机物释放量最少,木屑的释碳能力是4种材料中最差的,整个研究过程中溶液COD浓度始终未超过17 mg/（g.L）.综合比较而言,玉米芯更适宜作为反硝化碳源.正交试验表明,固液比的增加和水温的提高都会导致碳源释碳能力的提高,而水体pH的变化则对碳源释碳能力没有显著的影响;水温、pH值、固液比对碳源材料的释碳影响显著程度排序依次为固液比〉水温〉pH值.

英文摘要：

Organic carbon is needed as the electron donor in the process of reduction of nitrate transformation to nitrogen gas,which is essential for biological denitrification.Based on previous research,agriculture wastes including corncob,rice hull,rice straw and sawdust were selected as potential carbon source for denitrification.Using the static organic material of carbon source leaching kinetics test and orthogonal experiments of external factors on carbon emission process,carbon release and its mechanism of a variety of carbon materials were studied.Study showed that release process of various types of carbon source materials follows the second dynamics formula,the release curve displayed a better double-reciprocal relationship.It revealed that release amount of rice straw was the highest and sawdust was the lowest.Results showed that corncob could better be used as carbon source for denitrification.Orthogonal test indicated that the increasing of solid-liquid ratio and water temperature would lead to an enhanced release capacity of carbon,however,the change of pH had no significant effect on release capacity of carbon;according to significant degree of water temperature,pH,solid-liquid ratio impacted on the carbon release,it was sorted by solid-liquid ratio temperature pH.