Determination of the dewatered digestate amounts and methane yields from the co-digestion of biowaste as a basis for a cost-benefit analysis

Co-digestion is the simultaneous digestion of two or more substrates and a common practice at wastewater treatment plants (WWTPs). The amounts methane digested sludge produced are key parameters for evaluating economic efficiency co-digestion. However, share dewatered digestate from co-substrates not known. Synergistic effects in co-digestion, i.e. better biodegradability compared to mono-digestion each substrate, might reduce increase yields. these also influence calculation quantities co-substrates. main objective this work was provide basis cost-benefit analysis biowaste (BW) co-digestion WWTPs data. Therefore, continuous batch experiments with sewage (SS) BW were conducted evaluated production, possible synergistic effects. led an additional production 0.35 t total solids (TS) per ton TSadded 0.23 TS experiments. yield 441 L/kg 482 test. No observed both Batch tests found be suitable rough estimation parameters. Continuous recommended obtain robust A that electricity can generate savings 88-170 €/t grid purchase.