Mariculture wastewater treatment using electrochemically assisted submerged fixed bed bioreactor (E-SFBBR): Potential performance and pathways of nitrogen removal

• Published in: Journal of water process engineering Vol. 40; p. 101904
• Main Authors: Wei, Yuanrong, Sun, Zuoliang, Song, Xiefa, Sun, Guoxiang, Li, Meng
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2021
• Subjects: Electro-stimulation; Maricluture wastewater; N removal pathways; Submerged fixed bed bioreactors; Submerged fixed bed bioreactors; Electro-stimulation; Maricluture wastewater; N removal pathways
• ISSN: 2214-7144; 2214-7144
• DOI: 10.1016/j.jwpe.2020.101904

[Display omitted] •E-SFBBR enhanced N removal from carbon limited mariculture wastewater.•Current density of 0.1 mA cm−2 performed the best on N removal.•N removal pathways related to S and Fe transformations in E-SFBBR were proposed. Nitrogen discharged from mariculture industry leads to adjacent aquatic pollution. This study utilized an electrochemically assisted submerged fixed bed bioreactor (E-SFBBR) to treat carbon-limited saline mariculture wastewater and aimed to evaluate the performance and pathways of nitrogen removal by testing the effects of electrical stimulation and different current densities (CD). Electro-stimulation increased nitrogen removal performance of E-SFBBR from 1.1 to 2.2 g N m−2 d−1 to 3.0–3.4 g N m−2 d−1; CD of 0.10 mA cm−2 resulted in the highest N removal rate. Results of water quality at different depths and the batch experiment revealed the N removal pathways in E-SFBBR: in the cathode area, nitrogen removal was mainly attributed to the processes of denitrification and dissimilatory nitrate reduction to ammonia; and in the anode area, nitrification and autotrophic denitrification driven by sulfur or iron contributed to nitrogen elimination. These findings provided a promising method for enhancing N removal from carbon-limited mariculture effluents.