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Thermal depolymerization of biogas digestate                      279


                                               Biocrude          processing digestate




                               Proposed digestate handling pathway  Hydrothermal liquefation operation  Post-HTL water Gaseous products  existing  to compared








                        Alternative digestate handling pathway  Insoluble biochar  technology processing digestate one-step






















                         Digestate—high moisture sludge  Existing digestate handling  pathway Digestate processing for nutrient recovery  Liquid fraction Complex tertiary water treatment operations for microbe removal  Discharge of purified water to the environment  HTL-based proposed  the  of illustration













                                   Solid fraction


                                                           Nutrient rich  digestate fertiliser  simplified  A  10.1 Fig.  technologies.
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