水解是污泥厌氧消化的限速阶段，采用超声波、碱、零价铁-过硫酸盐氧化3种预处理技术可以有效加快水解，促进污泥厌氧消化。通过序批式实验得到3种技术的最优参数分别是：20 kHz超声波、10 g/L NaOH、c（Fe）=c（S₂O₈^2-）=30 mmol/L。采用一阶动力学模型、修正一阶动力学模型和Gompertz模型对最佳预处理参数下的污泥产甲烷曲线进行拟合，Gompertz模型的拟合精度较高且动力学参数具有实际意义。Gompertz模型的拟合结果表明，原污泥厌氧消化的最大产甲烷速率为6.09 mL/（g·d），经过超声波、碱、氧化预处理后，污泥的最大产甲烷速率分别提升至9.17、7.12、8.72 mL/（g·d）；原污泥厌氧消化的迟滞时间为3.03 d，经过超声波、碱、氧化预处理后，污泥的迟滞时间分别缩短至1.05、1.60、1.61 d。

Hydrolysis is the speed bottleneck stage during anaerobic digestion process of sludge.Pretreatment can accelerate hydrolysis and promote anaerobic digestion of sludge.Therefore,three kinds of pretreatment technologies such as ultrasonic,alkaline and zero-valent iron-persulfate are respectively used to accelerate hydrolysis.The optimum parameters for three kinds technologies are obtained through sequential batch experiments,i.e.20 kHz,10 g·L^-1 of NaOH and c(Fe)=c(S₂O₈^2-)=30 mmol·L^-1,respectively.The first-order kinetic model,modified first-order kinetic model and Gompertz model are used to fit the accumulated methane yield curves under optimum parameters.Gompertz model gives a high fitting accuracy that has practical significance for kinetic parameters.The fitting results by Gompertz model show that the maximum methane production rate by the common sludge anaerobic digestion process without pretreatment is 6.09 mL/(g·d).After pretreatment by ultrasonic,alkaline and oxidation,the maximum methane production rate increases to 9.17,7.12 and 8.72 mL/(g·d),respectively.The common sludge anaerobic digestion process without pretreatment needs 3.03 days of lag period,after ultrasonic,alkaline and oxidation pretreatment.the lag periods reduce to 1.05,1.60 and 1.61 days,respectively.Gompertz model is suitable for the evaluation of pretreatment technologies and is conducive to the optimization of sludge anaerobic digestion.

胡扬清(1993-),男,博士研究生,研究方向为有机固废厌氧消化处理,huyangqing@zju.edu.cn