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Joanna Rodziewicz, Artur Mielcarek, Kamil Bryszewski, Wojciech Janczukowicz +1
This study evaluates electric energy consumption for simultaneous nitrogen and phosphorus removal from high-nutrient, low-COD wastewater (soilless tomato cultivation) using two bioelectrochemical reactors: an aerobic rotating electrobiological disc contactor (REBDC) and an anaerobic sequencing batch biofilm reactor (SBBR). A cumulative energy indicator (EEINUTRIENTSrem) was developed to account for simultaneous nutrient removal. Results demonstrate that the anaerobic SBBR achieved substantially lower energy consumption (30–464 kWh/kg NUTRIENTSrem) compared to the aerobic REBDC (80–1380 kWh/kg NUTRIENTSrem) across tested current densities (0.63–5.0 A/m²).
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An attempt was undertaken to determine indicators of energy consumption in bio-electro reactors (BERs) i.e., an aerobic rotating electrobiological disc contactor (REBDC) and an anaerobic sequencing batch biofilm reactor (SBBR), during contaminant removal from soilless tomato cultivation wastewater having a specific composition, i.e., high nitrate and phosphorus concentrations and low COD. Because of this specificity, the energy consumption during the treatment process was characterized by a cumulative indicator for simultaneous removal of phosphorus and nitrates—EEINUTRIENTSrem (electric energy consumption per unit of removed nutrient load, expressed as kWh/kgNUTRIENTSrem). Four values of direct current density were tested: 0.63, 1.25, 2.5, and 5.0 A/m2. The indicator values were compared at a hydraulic retention time (HRT) of 24 h. The study demonstrated that the values of electric energy consumption per unit of removed nutrient load determined in the anaerobic SBBR ranged from 30 to 464 kWh/kg NUTRIENTSrem and were lower than the values obtained in the aerobic REBCD, i.e., 80–1380 kWh/kg NUTRIENTSrem.