Cultivation of Chlorella zofingiensis in bench-scale outdoor ponds by regulation of pH using dairy wastewater in winter, South China

► Cultivation of C. zofingiensis in dairy wastewater was investigated. ► Algal growth rate and composition were different under CO2 and HAc regulations. ► It's feasible to cultivate C. zofingiensis in outdoor ponds in winter, South China. ► And remarkable content of GABA in C. zofingiensis G1 could be obtained.