title: Nutrient removal and biodiesel production by integration of freshwater algae cultivation with piggery wastewater treatment.
abstract: An integrated approach, which combined freshwater microalgae Chlorella zofingiensis cultivation with piggery wastewater treatment, was investigated in the present study. The characteristics of algal growth, lipid and biodiesel production, and nutrient removal were examined by using tubular bubble column photobioreactors to cultivate C. zofingiensis in piggery wastewater with six different concentrations. Pollutants in piggery wastewater were efficiently removed among all the treatments. The specific growth rate and biomass productivity were different among all the cultures. As the initial nutrient concentration increased, the lipid content of C. zofingiensis decreased. The differences in lipid and biodiesel productivity of C. zofingiensis among all the treatments mainly resulted from the differences in biomass productivity. It is worthy of note that the diluted piggery wastewater with 1900 mg L(-1) COD provided an optimal nutrient concentration for C. zofingiensis cultivation, where the advantageous nutrient removal and the highest productivities of biomass, lipid and biodiesel were presented.
authors.affiliation: Guangzhou Institute of Energy Conversion, Key Laboratory of Renewable Energy and Gas Hydrate, Chinese Academy of Sciences, Guangzhou 510640, China. liandongzhu@gmail.com
authors.forename: Liandong
authors.initials: L
authors.lastname: Zhu
authors.forename: Zhongming
authors.initials: Z
authors.lastname: Wang
authors.forename: Qing
authors.initials: Q
authors.lastname: Shu
authors.forename: Josu
authors.initials: J
authors.lastname: Takala
authors.forename: Erkki
authors.initials: E
authors.lastname: Hiltunen
authors.forename: Pingzhong
authors.initials: P
authors.lastname: Feng
authors.forename: Zhenhong
authors.initials: Z
authors.lastname: Yuan
mesh_terms: D000822:Animal Husbandry; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D002708:Chlorella / Q000254:growth & development; D004952:Esters / Q000032:analysis; D005618:Fresh Water; D050356:Lipid Metabolism; D058086:Microalgae / Q000254:growth & development*; D009584:Nitrogen / Q000302:isolation & purification*; D010758:Phosphorus / Q000302:isolation & purification*; D058433:Photobioreactors / Q000382:microbiology; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification
chemical_list: D056804:Biofuels; D004952:Esters; D009584:Nitrogen; D010758:Phosphorus; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Biodiesel productivity; Chlorella zofingiensis; Microalgae; Nutrient removal; Piggery wastewater