Microalgae strains isolated from Wuliangye Industrial Park for efficient treating distillery wastewater

The treatment of distillery wastewater by microalgae is a promising low-carbon green technology for wastewater treatment. A key aspect of this process is the selection of appropriate microalgal strains. In this study, based on anaerobically treated distillery wastewater, Chlorella sorokiniana M7 with high decontamination efficiency was screened from Wuliangye wastewater treatment plant. This strain demonstrated superior decontamination efficiency compared to both Chlorella sp. (FACHB-30) and Tetradesmus obliquus (FACHB-12). Chlorella sorokiniana M7 exhibited optimal nitrogen and phosphorus removal efficiency at the carbon dioxide concentration of 2.5% and unsterilized wastewater, the removal rates for NH3-N and TP reached up to 100% and 90.39%, respectively. The findings from high-throughput sequencing suggested that as the duration of wastewater treatment with Chlorella M7 extends, there was a corresponding increase in the abundance of Fimbriimonadaceae, which played a pivotal role in enhancing the growth of Chlorella.