超声联合低温热水解促进剩余污泥破解和厌氧消化的研究

为了探索超声和低温热水解预处理技术对剩余污泥厌氧消化性能的影响，进行了单独超声、单独热水解和二者联合的实验研究.以温度和超声能量为控制参数，研究了不同预处理技术对污泥破解度DD（Disintegration degree of SCOD）和有机质溶出的影响.结果表明：联合预处理技术对DD和有机质浓度的增加效果比超声和热水解单独作用之和分别高4.04%、36.62mg/L. DD和实际输入能量之间存在较高的线性相关性（R²=0.977），即在本研究条件下，输入能量越高，污泥破解效果越好.超声和热水解联合预处理后污泥厌氧消化产甲烷量较原泥增加了30.2%～55.4%.DD和厌氧消化性能之间存在二次非线性关系（R²=0.821），且厌氧消化性能最高达到877.76LCH₄/kg VSS去除，该峰值出现在超声能量12000kJ/kg TS和热水解温度80℃联合作用条件下.

The effects of combined ultrasound and low temperature thermal pretreatments on disintegration and anaerobic digestion of waste activated sludge

To explore the effects of ultrasound and low temperature thermal pretreatments on anaerobic digestion of waste activated sludge (WAS), ultrasound, thermal, and combined (ultrasound+thermal) pretreatments were conducted. Taking temperature and specific energy as control parameters, disintegration degree of SCOD(DD) and organic disintegration before and after pretreatments were measured. Prior to anaerobic digestion, combined pretreatment significantly improved DD and soluble organic matter concentrations which were better than the sum of ultrasound and thermal pretreatments. The combination of ultrasound and thermal pretreatment under specific energy of 12000kJ/kg TS and temperature of 80℃, DD and soluble organic concentration were 4.04%、36.62mg/L higher than the sum of pretreatment alone. Besides, there was a highly linear relationship between DD and actual energies imparted to sludge (R²=0.977). Combined pretreatments improved the methane production of WAS during anaerobic digestion by 30.2%~55.4% than untreated sludge. It was also found that DD and anaerobic biodegradability had a conical relationship (R²=0.821). The optimum anaerobic biodegradability, 877.76LCH₄/kg VSS_removed, was achieved with combined pretreatment at temperature of 80℃ and specific energy of 12000kJ/kg TS.