Electrifying biotrickling filters for the treatment of aquaponics wastewater
•Non-conductive filling material brought insufficient and uncontrollable N removal.•Polarized conductive filling material provided limited but controllable N removal.•Mix of non-conductive and polarized conductive material were the most active.•The electrified biotrickling filter met the N standards...
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Veröffentlicht in: | Bioresource technology 2021-01, Vol.319, p.124221-124221, Article 124221 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | •Non-conductive filling material brought insufficient and uncontrollable N removal.•Polarized conductive filling material provided limited but controllable N removal.•Mix of non-conductive and polarized conductive material were the most active.•The electrified biotrickling filter met the N standards, closing aquaponics loop.
This work aimed to study the electrification of biotrickling filters by means of Microbial electrochemical technologies (MET) to develop an easy-to-assemble and easy-to-use MET for nitrogen removal without external aeration nor addition of chemicals. Four different designs were tested. The highest ammonium and nitrate removal rates (94 gN·m−3·d−1 and 43 gN·m−3·d−1, respectively) were reached by combining an aerobic zone with an electrified anoxic zone. The standards of effluent quality suitable for hydroponics were met at low energy cost (8.3 × 10−2 kWh·gN−1). Electrified biotrickling filters are a promising alternative for aquaponics and a potential treatment for organic carbon-deficient ammonium-contaminated waters. |
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ISSN: | 0960-8524 1873-2976 |
DOI: | 10.1016/j.biortech.2020.124221 |