Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada.
Waste Manag. 2012 Mar;32(3):542-9. doi: 10.1016/j.wasman.2011.10.007. Epub 2011 Nov 15.
To enhance the anaerobic digestion of municipal waste-activated sludge (WAS), ultrasound, thermal, and ultrasound+thermal (combined) pretreatments were conducted using three ultrasound specific energy inputs (1000, 5000, and 10,000 kJ/kg TSS) and three thermal pretreatment temperatures (50, 70 and 90°C). Prior to anaerobic digestion, combined pretreatments significantly improved volatile suspended solid (VSS) reduction by 29-38%. The largest increase in methane production (30%) was observed after 30 min of 90°C pretreatment followed by 10,000 kJ/kg TSS ultrasound pretreatment. Combined pretreatments improved the dimethyl sulfide (DMS) removal efficiency by 42-72% but did not show any further improvement in hydrogen sulfide (H(2)S) removal when compared with ultrasound and thermal pretreatments alone. Economic analysis showed that combined pretreatments with 1000 kJ/kg TSS specific energy and differing thermal pretreatments (50-90°C) can reduce operating costs by $44-66/ton dry solid when compared to conventional anaerobic digestion without pretreatments.
为了增强城市污水活性污泥（WAS）的厌氧消化，采用三种超声特定能量输入（1000、5000 和 10000 kJ/kg TSS）和三种热预处理温度（50、70 和 90°C）进行了超声、热和超声+热（组合）预处理。在进行厌氧消化之前，组合预处理可使挥发性悬浮固体（VSS）减少 29-38%。在 90°C 预处理 30 分钟后，进行 10000 kJ/kg TSS 超声预处理，可使甲烷产量最大增加 30%。与单独的超声和热预处理相比，组合预处理可将二甲基硫（DMS）的去除效率提高 42-72%，但对硫化氢（H（2）S）的去除率没有进一步提高。经济分析表明，与没有预处理的传统厌氧消化相比，采用 1000 kJ/kg TSS 特定能量的组合预处理，并采用不同的热预处理（50-90°C），可使每吨干固体的运行成本降低 44-66 美元。
