Performance of nitrobenzene and its intermediate aniline removal by constructed wetlands coupled with the micro-electric field

The degradation of nitrobenzene and its intermediate aniline from wastewater by constructed wetlands coupled with the micro-electric field (CW-MEF) technology was studied. The results showed that the CW-MEF system had good degradation. With the increase of influent concentration of nitrobenzene, the removal rate of the anode was excellent which remained above 86%, but the degradation of CW-MEF for COD decreased. In different stages, the power generation capacity was different. In the second stage, the power generation voltage reached 430 V and the average power density was 85.07 MW m(-3), while the maximum reached 87.47 MW m(-3). Through high-throughput sequencing analysis, the Al sludge layer contained 36% of thick-walled bacteria and 20% of bacteroides, the A2 contained about 20% of campylobacter green, and the A3 contained 10% of green campylobacter, pachyphyte and bacteroides. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

The study found that the CW-MEF system can effectively degrade nitrobenzene and aniline in wastewater, with different power generation capacities in different stages. High-throughput sequencing analysis revealed differences in bacterial composition in different sludge layers.