Public Works Research Institute, Tsukuba, Ibaraki, Japan E-mail:
Water Sci Technol. 2014;69(9):1949-55. doi: 10.2166/wst.2014.111.
The treatment performance of thermophilic anaerobic digestion (AD) of sewage sludge with high solids content was investigated with two laboratory-scale thermophilic anaerobic reactors (R1 and R2) with a feeding of pre-centrifuged sewage sludge. Reactor R1 was fed with sludge of 3.7% total solids (TS). The volatile solids (VS) removal ratio and methane yield in the stable state were 54.9% and 0.29 NL CH(4)/g VS(added), respectively. For reactor R2, when the TS content of fed sludge was 7.4%, the VS removal ratio and methane yield in the stable state were 73.2% and 0.38 NL CH(4)/g VS(added), respectively. When the TS content was increased to 9.5%, the VS removal ratio and methane yield slightly decreased to 69.3% and 0.32 NL CH(4)/g VS(added), respectively, but the reactor was stably operated. An increase of ammonia concentration was observed, but it was in the safe range without severe inhibition on the methane production. The result indicated that thermophilic AD could support sewage sludge with high TS content (9.5%) without abrupt deterioration of the treatment performance. The high-solids AD process is an economical method for centralized sewage sludge treatment with lower transport cost.
研究了高固体含量污水污泥高温厌氧消化（AD）的处理性能，采用两个带有预离心污水污泥进料的实验室规模高温厌氧反应器（R1 和 R2）。R1 反应器进料中污泥总固体（TS）含量为 3.7%。稳定状态下挥发性固体（VS）去除率和甲烷产率分别为 54.9%和 0.29NL CH4/g VS（添加）。对于 R2 反应器，当进料污泥 TS 含量为 7.4%时，稳定状态下 VS 去除率和甲烷产率分别为 73.2%和 0.38NL CH4/g VS（添加）。当 TS 含量增加到 9.5%时，VS 去除率和甲烷产率略有下降，分别为 69.3%和 0.32NL CH4/g VS（添加），但反应器仍稳定运行。氨浓度增加，但在没有对甲烷生产产生严重抑制的安全范围内。结果表明，高温 AD 可以支持高 TS 含量（9.5%）的污水污泥，而不会突然恶化处理性能。高固体 AD 工艺是一种经济的集中污水污泥处理方法，运输成本较低。
