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This study presents a dual-chambered bioelectrochemical system enhanced with Chlorella vulgaris microalgae and biochar for simultaneous nitrogen removal and biogas production from wastewater. Operating under anoxic conditions with a NH₃-N/NO₃-N ratio of 1.33, the system achieved >90% removal efficiency for both ammonia and nitrate nitrogen over 35-day batch experiments. Dominant bacterial genera (Sporosarcina, Tissieralla, Pseudomonas) facilitated nitrogen removal through anammox-like reactions, while biogas (N₂O, CH₄, CO₂) was generated as a recoverable energy product.

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What they did

System
MNRC
Substrate
synthetic mixture

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Abstract

Abstract Bioelectrochemical systems can recover energy while treating wastewater as an attractive form of bioengineering technology. This research devised a novel upgraded system that can remove a high proportion of nitrogen (N) from wastewater and produce biogas. We investigated the scale-up effect of mixing ammonia-nitrogen (NH 3 -N) and nitrate-nitrogen (NO 3 -N) under anoxic conditions, and we also assessed the mediation-impact of Chlorella vulgaris (C. vulgaris) and carbon-based biocatalyst (biochar). The experiment was carried out using three independent batches, and each lasted for 35 d. The results showed that the unique enhanced system could simultaneously remove more than 90% of NH 3 and NO 3 from wastewater and generate a significant amount of N 2 O, CH 4, and CO 2 . In addition, dominant bacteria genera such as Sporosarcina, Tissieralla , and Pseudomonas have played a robust role in N removal and biogas generation. Compared to past studies, the unique enhanced system significantly improved the N removal efficiency of the bioelectrochemical systems.

Keywords

BiocharBiogasWastewaterSewage treatmentBiogas productionProduction (economics)

Identifiers

DOI
10.21203/rs.3.rs-1531440/v1
Journal
Research Square
Year
2022