6. You need to convert a semi-solid (e.g. 80% moisture content) waste stream to renewable fuel. (a) Propose TWO different processes using physico-chemical, biochemical, and thermochemical conversion technologies. Please describe your processes in detail (process flow diagram is preferred but not mandatory). The conversion technology can be used singly or be integrated in series. (b) How can you make your processes carbon negative? Please briefly explain your solutions