Cost-effective wastewater treatment in a continuous manner by a novel bio-photoelectrolysis cell (BPE) system. (February 2019)

• Record Type: Journal Article
• Authors: Sun, Han; Zhao, Weiyang; Mao, Xuemei; Ren, Yuanyuan; Wu, Tao; Chen, Feng
• Is Part Of: Bioresource technology. Volume 273(2019)
• Page Start: 297
• Page End: 304
• Publication Date: 2019-02
• Subjects: Chlorella zofingiensis -- Electric current -- Nutrient removal -- Lipid productivity -- Recyclable wastewater treatment; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.11.045
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Electric current promoted daily nutrient removal. Electric current promoted 1.17-fold increase of lipid productivity. Harvesting by electric current was a less-cost approach. Bio-photoelectrolysis cell (BPE) system achieved repeated wastewater treatment. Abstract: 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/m 2 . 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/m 2 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.