title: Comparative analysis of duckweed cultivation with sewage water and SH media for production of fuel ethanol.
abstract: Energy crises and environmental pollution have caused considerable concerns; duckweed is considered to be a promising new energy plant that may relieve such problems. Lemna aequinoctialis strain 6000, which has a fast growth rate and the ability to accumulate high levels of starch was grown in both Schenk & Hildebrandt medium (SH) and in sewage water (SW). The maximum growth rates reached 10.0 g DW m(-2) day(-1) and 4.3 g DW m(-2) day(-1), respectively, for the SH and SW cultures, while the starch content reached 39% (w/w) and 34% (w/w). The nitrogen and phosphorus removal rate reached 80% (SH) and 90% (SW) during cultivation, and heavy metal ions assimilation was observed. About 95% (w/w) of glucose was released from duckweed biomass hydrolysates, and then fermented by Angel yeast with ethanol yield of 0.19 g g(-1) (SH) and 0.17 g g(-1) (SW). The amylose/amylopectin ratios of the cultures changed as starch content increased, from 0.252 to 0.155 (SH) and from 0.252 to 0.174 (SW). Lemna aequinoctialis strain 6000 could be considered as valuable feedstock for bioethanol production and water resources purification.
authors.affiliation: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, PR China.
authors.forename: Changjiang
authors.initials: C
authors.lastname: Yu
authors.affiliation: Beijing Risun Chemical Industry Technology Research institute Co. Ltd, Beijing, 100070, China.
authors.forename: Changjiang
authors.initials: C
authors.lastname: Sun
authors.affiliation: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Yu
authors.affiliation: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, PR China.
authors.forename: Ming
authors.initials: M
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, PR China.
authors.forename: Hua
authors.initials: H
authors.lastname: Xu
authors.affiliation: Qingdao Institute of Animal Sciences, Qingdao, 266100, China.
authors.forename: Jinshan
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, PR China.
authors.forename: Yubin
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, PR China.
authors.forename: Gongke
authors.initials: G
authors.lastname: Zhou
mesh_terms: D000687:Amylopectin / Q000378:metabolism; D000688:Amylose / Q000378:metabolism; D029064:Araceae / Q000254:growth & development* / Q000378:metabolism*; D056804:Biofuels; D018533:Biomass; D003470:Culture Media / Q000737:chemistry*; D046508:Culture Techniques / Q000379:methods*; D000431:Ethanol / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry*; D013213:Starch / Q000378:metabolism
chemical_list: D056804:Biofuels; D003470:Culture Media; D012722:Sewage; D000431:Ethanol; D013213:Starch; D000688:Amylose; D000687:Amylopectin