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Operation of a 2-Stage Bioelectrochemical System for Groundwater Denitrification

Department of Civil Engineering and Architecture, University of Pavia, via Adolfo Ferrata 3, 27100 Pavia, Italy
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Water 2019, 11(5), 959; https://doi.org/10.3390/w11050959
Received: 26 March 2019 / Revised: 18 April 2019 / Accepted: 5 May 2019 / Published: 8 May 2019
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Abstract

Nitrate groundwater contamination is an issue of global concern that has not been satisfactorily and efficiently addressed, yet. In this study, a 2-stage, sequential bioelectrochemical system (BES) was run to perform autotrophic denitrification of synthetic groundwater. The system was run at a 75.6 mgNO3-N L−1NCC d−1 nitrate loading rate, achieving almost complete removal of nitrate (>93%) and Total Nitrogen (TN) (>93%). After treatment in the first stage reactor values of effluent nitrate compatible with the EU and USA limits for drinking water (<11.3 and 10 mgNO3-N L−1, respectively) were achieved. Nitrite and nitrous oxide were observed in the first stage’s effluent, and were then successfully removed in the second stage. The observed nitrate removal rate was 73.4 ± 1.3 gNO3-N m−3NCC d−1, while the total nitrogen removal rate was 73.1 ± 1.2 gN m−3NCC d−1. Specific energy consumptions of the system were 0.80 ± 0.00 kWh m−3, 18.80 ± 0.94 kWh kgNO3-N−1 and 18.88 ± 0.95 kWh kgN−1. Combination of two denitrifying BES in series herein described proved to be effective. View Full-Text
Keywords: groundwater; autotrophic denitrification; bioelectrochemical system; biocathode; microbial electrochemical technologies; bioremediation; bioelectroremediation groundwater; autotrophic denitrification; bioelectrochemical system; biocathode; microbial electrochemical technologies; bioremediation; bioelectroremediation
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Callegari, A.; Bolognesi, S.; Cecconet, D. Operation of a 2-Stage Bioelectrochemical System for Groundwater Denitrification. Water 2019, 11, 959.

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