Life-cycle energy production and emissions mitigation by comprehensive biogas-digestate utilization

► A life-cycle assessment of a biogas-digestate utilization system is performed. ► Both biogas utilization and digestate reuse are vital for energy production. ► The system can be optimized by adjusting the ratio of biogas utilization pathways. ► Substitution for chemical fertilizers benefits environmental conditions. ► A tradeoff is acquired with foci on substitution for fertilizers and seed soaking.