Response of ammonium transformation in bioanodes to potential regulation: Performance, electromicrobiome and implications
Year: 2024
Type: article
Abstract: Understanding how potential regulation affects ammonium transformation in bioanodes is crucial for promoting their application. This study explored the performance, electrochemical properties, electromicrobiome of bioanodes across potentials from 0.0 V to 0.4 V vs. standard hydrogen electrode (SHE). Higher anode potentials enhanced the performance of electroactive biofilms and ammonium removal but suppressed nitrite oxidation while favoring dissimilatory nitrate reduction (DNRA), leading to increased nitrite accumulation. A reduction in nitrite-oxidizing bacteria (NOB) and an increase in DNRA-related genes resulted in an optimal nitrite-to-ammonium ratio of 1.32 for the Anammox process. Higher anodic potentials (0.3 and 0.4 V) were less effective for TN removal than lower potentials (0, 0.1, and 0.2 V), likely due to increased NOB and denitrification genes at lower potentials enhancing nitrite oxidation and denitrification. These findings indicate that regulating anodic potential effectively directs ammonium transformation in bioanodes, optimizing its conversion to N 2 or nitrite.
Source: Bioresource Technology
Authors: Xin Tang, Qianjing Yao, Xiaodun Jiang, Chunlin Wang, Yang Liu, Cui Li, Yanlong Chen, Wenzong Liu, Fan Chen, Yuheng Wang
Language: English
Subfield: Environmental Engineering
Field: Environmental Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,740
Awards: G2813513725, G5823614529
OpenAlex ID: W4403936309