VFAs、TOC及COD作为生物除磷能力指标的探讨

在实际生活污水的处理中,研究了通过A/O运行模式对生物除磷过程中磷的变化情况及在厌氧释磷过程中COD、TOC与VFAs变化之间的关系。结果表明,在厌氧释磷过程中VFAs的变化更能准确地反映系统内释磷进程,实际生活污水中能直接用于磷释放的有机物含量占COD的13.33%,并且释放1 mg P所需VFAs为1.401 mg,此值明显低于前期研究结果。通过对COD、TOC和VFAs 3种组分的分析,可将实际生活污水中的有机底物分为3类:易生物降解含碳有机物、难降解的含碳有机物和水中存在的无机性还原物质,含量分别占COD的13.33%、31.7%和54.97%,其中只有13.33%的含量对生物释磷有直接作用,并可对实际生活污水除磷有指导意义。

Comparative study on COD,TOC,VFAs as biological phosphorus removal index

Variation of phosphorus at the relationship of COD,TOC and fatty acids(VFAs) along with the phosphorus releasing period with real domestic wastewater were investigated.The experimental results showed that the variety of VFAs concentration would reflect the process of phosphorus releasing accurately.The proportion of organic substance used in phosphorus releasing was 13.33% of total COD in real domestic wastewater,and approximately 1.401 mg VFAs-COD were required to release 1mg of soluble phosphorus.The domestic wastewater composed by three parts,readily bio-degradable organic substance,refractory organic substance and reduction COD via the analysis of the COD,TOC and VFAs.The proportion of three parts was 13.33%,31.7% and 54.97%,respectively.The proportion of 13.33% would be used in phosphorus releasing straightly.Such a conclusion may be advantageously used in treating domestic wastewater for biological phosphorus removal.