Utilization and integration of microalgae consortium in treating undiluted anaerobic digestate animal effluent to produce animal feed, bio-oil, and biogas

[Display omitted] •High N and P nutrients in ADAE are suitable to be treated by microalgae consortium.•As much as 2 kg of animal feed was produced from treatment of 1 m3/d of ADAE.•The bio-oil was produced at 36–180 L/d for microalgae consortium grown in ADAE.•The integrated process produced 247–1,217 MWh y-1 of electricity from biogas.•Moreover, the process can reduce GHG emission by 2 kg-CO2eq kg−1 of HSCW. Anaerobic digestate animal effluent (ADAE) contains high N and P nutrients which need to be treated. In this study, an integrated process was proposed using a microalgae consortium of Chlorella and Scenedesmus. The system was designed for 71 m3/d (medium-sized) and 355 m3/d (large-sized) animals of ADAE. Process simulation estimated to produce 83–417 kg d-1 of microalgae biomass which can be used as further products. As much as 2 kg of animal feed and 36–180 L/d of bio-oil can be produced during the treatment of 1 m3/d of ADAE. The produced biogas can generate 247–1,217 MWh y-1 of electricity. Likewise, the process can reduce greenhouse gas emissions by 2 kg-CO2eq kg−1 of hot standard carcass weight (HSCW). This integrated system offers merits in treating ADAE as well as producing chemicals and energy with low environmental burdens.