title: Evaluation of an oil-producing green alga Chlorella sp. C2 for biological DeNOx of industrial flue gases.
abstract: NOx, a significant portion of fossil fuel flue gases, are among the most serious environmental issues in the world and must be removed in an additional costly gas treatment step. This study evaluated the growth of the green alga Chlorella sp. C2 under a nitrite-simulated NOx environment and the removal rates of actual flue gas fixed salts (FGFSs) from Sinopec's Shijiazhuang refinery along with lipid production. The results showed that nitrite levels lower than 176.5 mM had no significant adverse effects on the cell growth and photosynthesis of Chlorella sp. C2, demonstrating that this green alga could utilize nitrite and NOx as a nitrogen source. High concentrations of nitrite (88.25-176.5 mM) also resulted in the accumulation of neutral lipids. A 60% nitrite removal efficiency was obtained together with the production of 33% algae lipids when cultured with FGFS. Notably, the presence of nitrate in the FGFS medium significantly enhanced the nitrite removal capability, biomass and lipid production. Thus, this study may provide a new insight into the economically viable application of microalgae in the synergistic combination of biological DeNOx of industrial flue gases and biodiesel production.
authors.affiliation: Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences , Wuhan 430072, Hubei China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.forename: Weixian
authors.initials: W
authors.lastname: Chen
authors.forename: Yaqin
authors.initials: Y
authors.lastname: Qiao
authors.forename: Chenliu
authors.initials: C
authors.lastname: He
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wang
mesh_terms: D001673:Biodegradation, Environmental / Q000187:drug effects; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D019069:Cell Respiration / Q000187:drug effects; D002708:Chlorella / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism; D058440:Denitrification / Q000187:drug effects; D005453:Fluorescence; D005740:Gases / Q000737:chemistry*; D007221:Industry; D050356:Lipid Metabolism / Q000187:drug effects; D009573:Nitrites / Q000494:pharmacology; D009584:Nitrogen / Q000378:metabolism; D009589:Nitrogen Oxides / Q000302:isolation & purification*; D009821:Oils / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects; D045331:Photosystem I Protein Complex / Q000378:metabolism; D045332:Photosystem II Protein Complex / Q000378:metabolism
chemical_list: D005740:Gases; D009573:Nitrites; D009589:Nitrogen Oxides; D009821:Oils; D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D002734:Chlorophyll; D009584:Nitrogen; D010100:Oxygen