Investigating the influence of iron–carbon microelectrolysis on the performance and microbial community of constructed wetlands

Abstract

Iron-carbon microelectrolysis (Fe-C-ME) has been used extensively for the treatment of domestic sewage. In this study, CWs incorporated with Fe-C-ME were established, and the performance and microbial community structure of CWs were investigated. The results indicated that CWs incorporated with Fe-C-ME had better performance for treating domestic sewage. The NO 3-N, TN and TP removal efficiencies of CWs incorporated with Fe-C-ME were 82.3, 80.3 and 98.2%, respectively, which were 7.8, 4.7 and 25.2% higher than those of the CWs without Fe-C-ME. High-throughput sequencing analysis demonstrated that Fe-C-ME changed the microbial community structure. For example, some dominant groups at the class level, such as Betaproteobacteria (15.2%), Gammaproteobacteria (10.6%) and Deltaproteobacteria(10.0%), were promoted by Fe-C-ME. The results demonstrated that the relative abundance of bacteria involved in nitrification, denitrification, polyphosphate accumulation or COD reduction at the genus level thrived because of the presence of Fe-C-ME, which can improve the performance of CWs.

A Review on Microorganisms in Constructed Wetlands for Typical Pollutant Removal: Species, Function, and Diversity

“…The main phylum is Proteobacteria , which are largely involved in phosphorus removal ( Si et al, 2018 , 2019 ; Huang et al, 2020a ). Of these, Alphaproteobacteria , Betaproteobacteria , and Gammaproteobacteria contain most of the microbial species associated with biological phosphorus removal ( Shi et al, 2017 ; Huang et al, 2020a ; Wei et al, 2020 ; Lv et al, 2021 ). The families Rhodobacteraceae and Rhizobiaceae of the class Alphaproteobacteria can absorb volatile fatty acids under aerobic conditions and convert them into poly-β-hydroxyalkanoates, facilitating total phosphorus removal in CWs ( Lv et al, 2021 ).…”