超声波破解污泥对厌氧水解过程中有机物水解的影响

Effect of ultrasound pretreatment on organic matter degradation during anaerobic hydrolysis of sludge

为了研究超声波预处理对污泥厌氧水解过程的作用,利用声能密度为0.96 kW/L的超声波对污泥进行破解,考察厌氧水解过程中蛋白质及多糖的浓度的变化。结果表明,随着超声波破解时间的延长,污泥中的溶解性蛋白质和多糖浓度总体呈现上升趋势;污泥经0.96 kW/L的超声波破解15 min后进行厌氧水解,溶解性蛋白质及多糖的质量浓度分别是未破解污泥的42.4倍及15.6倍,其水解饱和常数分别为834.28和151.40,同时,蛋白酶及α-葡萄糖苷酶活力是未破解污泥的2.04倍及1.68倍,说明超声波预处理对污泥厌氧水解有很好的促进作用。

In order to study the effect of ultrasound pretreatment on anaerobic hydrolysis of sludge, a test of sludge disintegration by ultrasound with ultrasonic energy density of 0.96 kW/L was carried out, and the changes of protein and polysaccharide concentrations during the process of anaerobic hydrolysis was investigated. The test results showed that, the concentration of soluble protein and polysaccharide in the sludge presented a rising ten- dency along with the time, through the 15-rain disintegration by 0.96 kW/L ultrasound and anaerobic hydrolysis, the mass concentrations of soluble protein and polysaccharide and the activity of protease and ot-glucosidase of the disintegrated sludge were 42.4, 15.6, 2.04 and 1.68 times higher respectively than those in the sludge which had never been disintegrated before, and the hydrolysis saturation constants were 834.28 and 151.40 respectively, which indicated that, ultrasound pretreatment had great acceleration effect on anaerobic hydrolysis of sludge.