Cultivation of microalgae Chlorella zofingiensis on municipal wastewater and biogas slurry towards bioenergy.

The high cost of large-scale cultivation of microalgae has limited their industrial application. This study investigated the potential use of mixed biogas slurry and municipal wastewater to cultivate microalgae. Pig biogas slurry as the sole nutrient supplement, was assessed for the cultivation of Chlorella zofingiensis in municipal wastewater. Batch culture of various ratios of pig biogas slurry and municipal wastewater were compared. The characteristics of algal growth and lipid production were analyzed, and the removal rates of nitrogen and phosphate were examined. Results indicate that 8% pig bio-gas slurry in municipal wastewater, had a significant effect on microalgal growth. C. zofingiensis, with 2.5 g L-1 biomass, 93% total nitrogen and 90% total phosphorus removal. Lipid content was improved by 8% compared to BG11 medium. These findings show that mixing pig biogas slurry and municipal wastewater, without additional nutrition sources, allows efficient cultivation of C. zofingiensis. This is of high research and industrial significance, allowing cultivation of C. zofingiensis in mixed waste culture solution without additional nutrition sources.

Zhou W ，Wang Z ，Xu J ，Ma L ... -  《-》

Nutrient removal and biodiesel production by integration of freshwater algae cultivation with piggery wastewater treatment.

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.

Zhu L ，Wang Z ，Shu Q ，Takala J ，Hiltunen E ，Feng P ，Yuan Z ... -  《-》

Water-saving analysis on an effective water reuse system in biodiesel feedstock production based on Chlorella zofingiensis fed-batch cultivation.

Yang K ，Qin L ，Wang Z ，Feng W ，Feng P ，Zhu S ，Xu J ，Yuan Z ... -  《WATER SCIENCE AND TECHNOLOGY》

Integration of microalgae cultivation with industrial waste remediation for biofuel and bioenergy production: opportunities and limitations.

McGinn PJ ，Dickinson KE ，Bhatti S ，Frigon JC ，Guiot SR ，O'Leary SJ ... -  《-》

Screening of microalgae for integral biogas slurry nutrient removal and biogas upgrading by different microalgae cultivation technology.

Wang X ，Bao K ，Cao W ，Zhao Y ，Hu CW ... -  《Scientific Reports》