外加碳源成本较低，可以提高反硝化速率，因此成为水处理研究的热点之一。总结了常见的固体外加碳源、液体外加碳源以及气体外加碳源的研究及应用。外加碳源在应用过程中存在一定困难，但大多数外加碳源有机碳释放量高，还可以利用某些废弃物作为外加碳源解决反硝化碳源不足的问题。

There are insufficient carbon sources during denitrification in water treatment,external carbon source is hence required to ensure denitrification.External carbon source has developed rapidly in water treatment due to its high denitrification rate and low cost.Research and applications of common solid external carbon sources,liquid external carbon sources and gas external carbon sources are summarized.Although there exist certain difficulties in applications of external carbon sources,most of external carbon sources can release high concentration of organic carbon.Some wastes can be utilized to supplement carbon source for denitrification.

高欣东(1995-),女,硕士生,研究方向为地表水处理,798556707@qq.com