Concurrent treatment of raw and aerated swine wastewater using an electrotrophic denitrification system

Anna Prokhorova, Mami Kainuma, Rie Hiyane, Susan Boerner, Igor Goryanin

Research output: Contribution to journalArticlepeer-review

Abstract

Enhanced nitrate removal in the cathode chamber of bioelectrochemical systems (BES) using aerated swine wastewater under high nitrate levels and low organic carbon was investigated in this study, focusing on the relationship between nitrogen and bacterial communities involved in denitrification pathways. BESs with the anion exchange membrane (AEM) under cathodic applied potentials of −0.6 V vs. AgCl/AgCl reference electrode showed a removal rate of 99 ± 2 mg L−1 d−1. Moreover, organic compounds from the untreated full-strength wastewater were simultaneously eliminated in the anode chamber with a removal rate of 0.46 g COD L−1 d−1 with achieved efficiency of 61.4 ± 0.5% from an initial concentration of around 5 g of COD L−1, measured over the course of 7 days. The highest microbial diversity was detected in BESs under potentials of −0.6 V, which include autotrophic denitrifiers such as Syderoxidans, Gallionela and Thiobacillus.
Original languageEnglish
Article number124508
Number of pages11
JournalBioresource technology
Volume322
Early online date8 Dec 2020
DOIs
Publication statusPublished - 1 Feb 2021

Keywords

  • Biocathodic denitrification
  • Wastewater treatment
  • Bioelectrochemical systems
  • Autotrophic microbial biofilm

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