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Cost-effective wastewater treatment in a continuous manner by a novel bio-photoelectrolysis cell (BPE) system
- Sun, Han, Zhao, Weiyang, Mao, Xuemei, Ren, Yuanyuan, Wu, Tao, Chen, Feng
- Bioresource technology 2019 v.273 pp. 297-304
- biomass, cell growth, cost effectiveness, electric current, energy, harvesting, lipid content, lipids, microalgae, models, nitrogen, phosphorus, wastewater, wastewater treatment
- Approaches to improve wastewater treatment by microalgae have objectives of greater culture control, efficient nutrient removal and increased lipid content. This work designed a bio-photoelectrolysis cell (BPE) system to modulate wastewater treatment by electric current. The electric current had the capacity to enrich entrapped cell weight with a 0.72-fold increase, which resulted in high daily nutrient removal, with 6.78 mg/L/d for nitrogen and 2.14 mg/L/d for phosphorus at 0.6 A/m2. As the nutrient removal was mostly dependent on cell growth, the 1.17-fold increase of lipid productivity was achieved. The harvesting at 6 A/m2 required lower energy input of 1.77 KWh/kg. For the recyclability of treatment, BPE system could continuously treat the fresh wastewater for at least three cycles with biomass and lipid productivities of 68.67 and 22.04 mg/L/d, respectively. The nitrogen removal model of Cst = 45.52–5.52exp(0.45 t) and phosphorus removal model of Cst = 12.54–1.48exp(0.45 t) were established to evaluate the stability of BPE system.