Enhancement of Lipid Production of Chlorella Pyrenoidosa Cultivated in Municipal Wastewater by Magnetic Treatment

Abstract

Despite the significant breakthroughs in research on microalgae as a feedstock for biodiesel, its production cost is still much higher than that of fossil diesel. One possible solution to overcome this problem is to optimize algal growth and lipid production in wastewater. The present study examines the feasibility of using magnetic treatment for enhancement of algal lipid production and wastewater treatment in outdoor-cultivated Chlorella pyrenoidosa. Results confirmed that magnetic treatment significantly enhances biomass and lipid productivity of C. pyrenoidosa by 12 and 10 %, respectively. Application of magnetic field in a semi-continuous culture resulted in highly treated wastewater with total nitrogen maintained under 15 mg L, ammonia nitrogen below 5 mg L, total phosphorus less than 0.5 mg L, and COD less than 50 mg L. In addition, magnetic treatment resulted in a decrease of wastewater turbidity, an increase of bacterial numbers, and an increase of active oxygen in wastewater which might be attributed to the enhancement of growth and lipid production of C. pyrenoidosa.

Magnetic Field (MF) Applications in Plants: An Overview

“…Deamici et al [ 96 ] verified that 60 mT applied throughout the cultivation increased by 20.5% and 24.8% in terms of biomass and carbohydrate content, respectively. Han et al [ 100 ] observed that 0.5 T stimulated 12% biomass and 10% lipid productivity when MF was applied throughout the cultivation. Chu et al [ 95 ] verified the effects of MF and nitrate concentration on the growth of Nannochloropsis oculate .…”

Potential Applications of Native Cyanobacterium Isolate (Arthrospira platensis NIOF17/003) for Biodiesel Production and Utilization of Its Byproduct in Marine Rotifer (Brachionus plicatilis) Production

“…At present, biodiesel's production cost is from 1.5 to 3-fold more than fossil diesel due to the high cost of raw feedstocks and unavailability of oil crops utilized for human food consumption [2]. Algal biomass are considered an attractive natural source of bioactive materials that can be utilized in several applications such as food industry [3], pharmaceuticals [4], cosmetics [5], biogas and biodiesel [6,7], antimicrobial and antioxidant activities [3,8], aquaculture [9][10][11][12], biofertilizers and bioremediation [13][14][15][16]. Therefore, the screening of native microalgae species is necessary to realize a potent algal database with effective commercial biotechnological applications [3,17].…”

Potential Applications of Arthrospira platensis Lipid-Free Biomass in Bioremediation of Organic Dye from Industrial Textile Effluents and Its Influence on Marine Rotifer (Brachionus plicatilis)

“…Algal biomass is an attractive inbred bioactive substances that can be used in different industrial uses including aquaculture diet feed additive [ 10 ], aquaculture water-conditioner [ 11 ], plant growth biostimulants [ 12 ], the food industry [ 13 ], pharmaceuticals [ 14 ], antimicrobial substances [ 15 ], cosmetics [ 16 ], bioremediation [ 17 ], biodiesel [ 18 , 19 ], and crude bio-oil [ 20 ]. One of the most interesting applications is the production of biodiesel from microalgae due to the relatively high lipid productivity [ 18 , 19 ].…”