SUNLi-li,LIChang-fu,YAODeng-hui.Impact of Heavy Metal Thallium on a Novel Post-anoxic Denitrification Process[J].China Water & Wastewater,2024,40(15):75-82.
Impact of Heavy Metal Thallium on a Novel Post-anoxic Denitrification Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第15期
Page:
75-82
Column:
Date of publication:
2024-08-01
- Keywords:
- heavy metal Tl; post-anoxic denitrification; nutrient removal; EPS
- Abstract:
- In light of the ambiguous impact of thallium (Tl) on the operational performance of a novel post-anoxic denitrification process, an investigation into the influence of Tl on the novel post-anoxic denitrification process at room temperature was conducted by regulating the influent Tl concentration, and the underlying mechanism was elucidated. Even the low concentration of Tl (5 μg/L) hindered the effective removal of pollutants and nutrients in the process. Furthermore, Tl influenced the sludge characteristics in the post-anoxic denitrification process, decreased total suspended solids （TSS） concentration and VSS/TSS ratio, and promoted the secretion of extracellular polymeric substances (EPS). The intracellular polymeric substances analysis revealed that Tl decreased the concentration of polyhydroxyalkanoate (PHA), but enhanced the metabolism of glycogen. The analysis of microbial community composition revealed that a high concentration of Tl led to a decrease in the relative abundance of Proteobacteria at the phylum level, and the relative abundance of Chloroplast and Devosia at the genus level, consequently diminishing the removal efficiency of pollutants and nutrients.
Last Update:
2024-08-01