title: Effect of static magnetic field on the oxygen production of Scenedesmus obliquus cultivated in municipal wastewater.
abstract: Algal-bacterial symbiotic system, with biological synergism of physiological functions of both algae and bacteria, has been proposed for cultivation of microalgae in municipal wastewater for biomass production and wastewater treatment. The algal-bacterial symbiotic system can enhance dissolved oxygen production which enhances bacterial growth and catabolism of pollutants in wastewater. Therefore, the oxygen production efficiency of microalgae in algal-bacterial systems is considered as the key factor influencing the wastewater treatment efficiency. In the present study, we have proposed a novel approach which uses static magnetic field to enhance algal growth and oxygen production rate with low operational cost and non-toxic secondary pollution. The performance of oxygen production with the magnetic field was evaluated using Scenedesmus obliquus grown in municipal wastewater and was calculated based on the change in dissolved oxygen concentration. Results indicated that magnetic treatment stimulates both algal growth and oxygen production. Application of 1000 GS of magnetic field once at logarithmic growth phase for 0.5 h increased the chlorophyll-a content by 11.5% over the control after 6 days of growth. In addition, magnetization enhanced the oxygen production rate by 24.6% over the control. Results of the study confirmed that application of a proper magnetic field could reduce the energy consumption required for aeration during the degradation of organic matter in municipal wastewater in algal-bacterial symbiotic systems.
authors.affiliation: Harbin Institute of Technology, Shenzhen Graduate School, 518055 Shenzhen, China.
authors.forename: Renjie
authors.initials: R
authors.lastname: Tu
authors.affiliation: Harbin Institute of Technology, Shenzhen Graduate School, 518055 Shenzhen, China. Electronic address: 13828830095@139.com.
authors.forename: Wenbiao
authors.initials: W
authors.lastname: Jin
authors.affiliation: Harbin Institute of Technology, Shenzhen Graduate School, 518055 Shenzhen, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Xi
authors.affiliation: Harbin Institute of Technology, Shenzhen Graduate School, 518055 Shenzhen, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Yang
authors.affiliation: Harbin Institute of Technology, Shenzhen Graduate School, 518055 Shenzhen, China.
authors.forename: Song-Fang
authors.initials: SF
authors.lastname: Han
authors.affiliation: Harbin Institute of Technology, Shenzhen Graduate School, 518055 Shenzhen, China; Botany Department, Faculty of Science, Tanta University, 31527 Tanta, Egypt.
authors.forename: Abd El-Fatah
authors.initials: Ael-F
authors.lastname: Abomohra
mesh_terms: D001673:Biodegradation, Environmental; D002734:Chlorophyll / Q000378:metabolism*; D000077194:Chlorophyll A; D060526:Magnetic Fields; D010100:Oxygen / Q000378:metabolism*; D044444:Scenedesmus / Q000254:growth & development* / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000382:microbiology; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D002734:Chlorophyll; D000077194:Chlorophyll A; D010100:Oxygen; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Algal-bacterial systems; Oxygen production; Scenedesmus obliquus; Static magnetic field; Wastewater treatment