Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China.
College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Bioresour Technol. 2021 Feb;321:124454. doi: 10.1016/j.biortech.2020.124454. Epub 2020 Nov 27.
Hydrothermal pretreatment (HTP) conditions were optimized for continuous mesophilic (MAD) and thermophilic (TAD) anaerobic digestion of high-solid sludge (10-11% total solids). COD solubilization increased with prolonged HTP durations, and became not significant after 210 min. According to the methane production rate and energy consumption, the optimal HTP temperature was determined at 160 °C. Regarding continuous operation without HTP, TAD achieved higher methane yield and volatile solids (VS) reduction, at 0.12 L/g VS and 23.9%, respectively. After HTP, methane yield and VS reduction in MAD and TAD were increased by 400% and 191% (MAD), 67% and 72% (TAD), respectively. TAD was limited due to the inhibition from about 2800 mg/L of NH-N concentration. The methanogenic activity of MAD was enhanced, whereas TAD displayed a reduced value owing to ammonia inhibition. Ultimately, MAD with HTP and TAD without HTP achieved the higher energy balance, 5.25 and 3.27 kJ/g VS, respectively.
优化了水热预处理 (HTP) 条件，以实现高固体污泥 (10-11%总固体) 的中温 (MAD) 和高温 (TAD) 厌氧消化的连续运行。随着 HTP 持续时间的延长，COD 溶出率增加，210 分钟后不再显著。根据甲烷产率和能耗，确定最佳 HTP 温度为 160°C。对于没有 HTP 的连续运行，TAD 实现了更高的甲烷产量和挥发性固体 (VS) 减少率，分别为 0.12 L/g VS 和 23.9%。经过 HTP，MAD 和 TAD 的甲烷产量和 VS 减少率分别增加了 400%和 191%（MAD）、67%和 72%（TAD）。由于 NH-N 浓度约为 2800mg/L，TAD 受到抑制。MAD 的产甲烷活性增强，而 TAD 由于氨抑制而显示出降低的值。最终，经过 HTP 的 MAD 和未经 HTP 的 TAD 分别实现了更高的能量平衡，分别为 5.25 和 3.27 kJ/g VS。
