High-solids thermophilic anaerobic digestion fed with sewage sludge of 7–8% and 9–10% total solids was investigated at the hydraulic retention time of 20 days in this lab-scale study. The anaerobic digester fed with 7–8% sewage sludge was successfully operated, resulting in volatile solids (VS) destruction of 57.8% and methane production of 0.327 L/gVS (at standard temperature and pressure). When fed with 9–10% sewage sludge, the control digester was upset after about 80 days of operation. Total ammonia nitrogen (TAN) of 2500 mgN/L or more caused inhibition to anaerobic microorganisms. Another digester combined with weekly batch ammonia stripping of digested sludge in a side-stream configuration (80 °C, 2 h, initial pH of 9 with NaOH and return ratio of 70%), was maintained at the average TAN of 1720 mgN/L, and was able to continue without ammonia inhibition. TAN was a better indicator on inhibition of ammonia than free ammonia nitrogen (FAN). Microbial analysis revealed poor microbial diversity of digested sludge, that is, Class Clostridia for Bacteria and Geneus Methanothermobacter and Methanosarcina for Archaea were predominated. In conclusion, high-solids thermophilic anaerobic digestion can accommodate the influent sewage sludge up to 10%, as far as TAN is properly controlled in digester.

在此实验室规模的研究中，在20天的水力停留时间下，对高固体嗜热厌氧消化物（总固体量为7–8％和9–10％）进行了研究。厌氧消化池中装有7–8％的污水污泥，其运行成功，导致挥发性固体（VS）的破坏率为57.8％，甲烷生成量为0.327 L / gVS（在标准温度和压力下）。当饲喂9-10％的污水污泥时，对照蒸煮器在运行约80天后会感到不适。总氨氮（TAN）大于或等于2500 mgN / L会导致厌氧微生物受到抑制。另一个蒸煮器与侧流构型（80°C，2 h，初始pH为9，NaOH回流率为70％）结合每周分批蒸煮污泥的氨气保持在平均TAN为1720 mgN / L ，并且能够在没有氨抑制的情况下继续进行。与游离氨氮（FAN）相比，TAN是更好的氨抑制指标。微生物分析表明，消化污泥的微生物多样性差，即细菌和属的梭状芽胞杆菌用于古生菌的甲烷杆菌属和甲烷菌属占主导地位。总之，只要对消化池中的TAN进行适当控制，高固体热厌氧消化可以容纳高达10％的进水污泥。