Hitachi Plant Technologies, Ltd, 5-2 Higashi-Ikebukuro 4-Chome, Toshima-ku, Tokyo 170-8466, Japan.
Water Sci Technol. 2013;67(11):2527-33. doi: 10.2166/wst.2013.154.
The influence of two pretreatment methods, thermal treatment and low-pressure wet oxidation, on the sludge digestion efficiency was examined. Batch thermophilic anaerobic digestion was used to evaluate the effectiveness of the pretreatment methods in terms of volatile suspended solids (VSS) digestion efficiency and gas production. The results showed that the gas production was not proportional to the VSS degradation efficiency of either thermal treatment or low-pressure wet oxidation. Low-pressure wet oxidation treatment at 150 °C along with 40% of the theoretical oxygen required to oxidize organic carbon gave the highest gas production and the VSS digestion efficiency of 77% at a VSS loading rate of 8 g l(-1) d(-1). The digestion efficiency was about 30% higher than that of thermophilic anaerobic digestion without sludge pretreatment. Sewage sludge could be treated effectively at a high VSS digestion efficiency with this pretreatment followed by thermophilic anaerobic digestion.
研究了两种预处理方法（热处理和低压湿式氧化）对污泥消化效率的影响。采用分批高温厌氧消化法，根据挥发性悬浮固体（VSS）消化效率和产气量来评估预处理方法的效果。结果表明，无论是热处理还是低压湿式氧化，产气量都与 VSS 降解效率不成正比。在 VSS 负荷率为 8 g l(-1) d(-1)时，150°C 下进行低压湿式氧化处理并添加氧化有机碳所需理论氧量的 40%，可获得最高的产气量和 77%的 VSS 消化效率。与未经污泥预处理的高温厌氧消化相比，消化效率提高了约 30%。采用这种预处理方法后再进行高温厌氧消化，可以有效地处理高 VSS 消化效率的污水污泥。
