固相自养-异养反硝化脱氮同步去除微污染物

Solid phase autotrophic-heterotrophic denitrification and simultaneously removal of trace pollutants

针对固相反硝化体系,以聚己内酯复合花生壳(PCL/PS)的固体碳源为基底,耦合以S和Fe O主导的自养反硝化,构建新型多功能碳源,考察其对典型微污染物(Cr(Ⅵ)、ClO_(4)^(-)、BPA、NPX)与硝酸盐的同步降解效能,探究自养异养共存的反硝化体系内微生物群落特征及微观作用机制.结果表明,PCL/PS异养反硝化体系具有更好的反硝化脱氮和同步去除Cr(Ⅵ)、BPA性能,对NO_(3)^(-)-N、Cr(Ⅵ)的去除率分别为94%、92%,对NO_(3)^(-)-N、BPA的去除率均可达99%以上;PCL/PS同时耦合Fe O和S的体系反硝化脱氮同步去除ClO_(4)^(-)、NPX性能良好且稳定,在反硝化率均维持90%的基础上,对NO_(3)^(-)-N、ClO_(4)^(-)的去除率分别达90%、96%,对NO_(3)^(-)-N、NPX的去除率分别达96%、99%;固体碳源种类不同,其对微污染物降解去除的选择性也不同.测序结果表明,耦合自养反硝化后,反应体系内微生物多样性和丰富度均有所提高,Clostridium_sensu_strito、Lactococcus和Prevotella是4个固体碳源体系中影响污染物去除性能的主要优势菌属.

Aiming at the solid-phase denitrification system,PCL/PS(polycaprolactone composite peanut shell)solid carbon source was used as the substrate,coupled with autotrophic denitrification dominated by S and FeO to construct a new multi-functional carbon source.The simultaneous degradation efficiency of typical micropollutant(Cr(Ⅵ),ClO_(4)^(-),BPA,NPX)and nitrates was investigated,and the microbial community characteristics and micro-mechanism in the denitrification system of autotrophic heterotrophic coexistence were explored.The results showed that the PCL/PS heterotrophic denitrification system had better denitrification and simultaneous removal of Cr(VI)and BPA.The removal rates of NO_(3)^(-)-N and Cr(VI)were 94%and 92%,respectively,and the removal rates of NO_(3)^(-)-N and BPA were more than 99%.The simultaneous removal of ClO_(4)^(-)and NPX by denitrification and denitrification in the system of PCL/PS coupled with FeO and S was good and stable.Based on 90%denitrification rate,the removal rates of NO_(3)^(-)-N and ClO_(4)^(-)were 90%and 96%,respectively,and the removal rates of NO_(3)^(-)-N and NPX were 96%and 99%,respectively.Different solid carbon sources have different selectivity for the degradation and removal of micropollutant.The sequencing results showed that the microbial diversity and richness in the reaction system were improved after coupled autotrophic denitrification.Clostridium_sensu_strito,Lactococcus and Prevotella were the main dominant bacteria affecting the removal performance of pollutants in the four solid carbon source systems.