Chlorella vulgaris cultivation in simulated wastewater for the biomass production, nutrients removal and CO2 fixation simultaneously. (15th April 2021)

• Record Type: Journal Article
• Authors: Kong, Wenwen; Kong, Jia; Ma, Jiao; Lyu, Honghong; Feng, Shuo; Wang, Zhuozhi; Yuan, Peng; Shen, Boxiong
• Is Part Of: Journal of environmental management. Volume 284(2021)
• Publication Date: 2021-04-15
• Subjects: Carbon dioxide fixation -- Chlorella vulgaris -- Nitrogen -- Phosphorus -- Kinetics; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2021.112070
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Chlorella vulgaris ( C. vulgaris ) was promising microalgae to simultaneously achieve biomass production, carbon dioxide (CO2 ) fixation, nutrients removal and proteins production especially under different conditions of CO2 gas and wastewaters. Results presented that maximal specific growth rate of C. vulgaris was 0.21–0.35 d −1 and 0.33–0.43 d −1 at 0.038% and 10% CO2 respectively, and corresponding maximal CO2 fixation rate was attended with 4.51–14.26 and 56.26–85.72 mg CO2 ·L −1 ·d −1 . C. vulgaris showed good wastewater removal efficiency of nitrogen and phosphorus at 10% CO2 with 96.12%–99.61% removal rates. Nitrogen fixation amount achieved 41.86 mg L −1 when the initial NH4 Cl concentration was set at 60 mg L −1 at 10% CO2 . Improved total protein (25.01–365.49 mg) and amino acids (24.56–196.44 mg) contents of C. vulgaris biomass was observed with the increasing of added CO2 and ammonium concentrations. Moreover, the developed kinetic function of C. vulgaris growth depends on both phosphorus quota and nitrogen quota with correlation coefficient ( R 2 ) ranged from 0.68 to 0.97. Computed maximal consumed nutrients concentrations ( ΔC max ) based on Logistic function are positively related to initial NH4 + -N concentrations, which indicated that adding ammonium could stimulate the utilization of both phosphorus and nitrogen. Graphical abstract: Image 1 Highlights: CO2 fixation and nutrients removal by C. vulgaris could be improved at 10% CO2 . Adding CO2 and NH4 + -N promote the production of protein contents in C. vulgaris. Kinetic function of C. vulgaris growth depends on both P quota and N quota. Adding NH4 + -N simulate the utilization of not only phosphorus but also nitrogen. Higher NH4 + -N concentrations reduced consumption rate of nitrogen by C. vulgaris.