Based upon the information provided in the following figure, calculate the critical influent COD to sustainably treat a warm high-strength organic waste stream (assume influent temperature is 30°C) using a thermophilic anaerobic digester running under 75% insulation efficiency and 55°C.

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35 100 % Efficiency 60 30 °C 50 25 Typically needed temperature increase 20 for mesophilic operation °F 40 30 15 20 10 50% Efficiency 5 10 2000 4000 6000 8000 10000 12000 Influent COD AT (°F) AT(°C) 35 100 % Efficiency 60 30 °C 50 25 Typically needed temperature increase 20 for mesophilic operation °F 40 30 15 20 10 50% Efficiency 5 10 2000 4000 6000 8000 10000 12000 Influent COD AT (°F) AT(°C)