温度对热水解预处理高含固污泥特性的影响

以含固率为10%的污泥为对象,研究不同温度和时间条件下热水解过程中有机物转化规律对污泥特性的影响。结果表明:随着热水解时间的延长和温度的升高,污泥中挥发性悬浮固体(VSS)的水解率逐渐升高。在热水解时间为20 min时,温度由150℃升高到180℃,VSS水解率由22.9%增至38.4%,污泥中VSS由46.28 g/L降低到40.63 g/L。水解液组分分析表明,溶解性化学需氧量(SCOD)主要组成为蛋白质(50%)、碳水化合物(15%~20%)、可挥发性脂肪酸(15%~20%)。水解液中氮主要以有机氮的形式存在。在热水解条件达到165℃、50 min时,氨氮浓度为1.16 g/L,之后,随着温度的升高和时间的延长,氨氮浓度基本不变。

Effect of temperature on characteristics of thermal hydrolysis pretreatment of high-solid sludge

The influence of substance transformation at different temperatures and times condition during thermal hydrolysis pretreatment process on sludge(10% solids content) characteristics was investigated.The results showed that the hydrolysis rate of volatile suspended solids(VSS) gradually increased with the increasing of thermal hydrolysis time and temperature.The hydrolysis rate increased from 22.9% to 38.4% and the VSS in the sludge reduced from 46.28 g/L to 40.63 g/L with the temperature increased from 150℃ to 180℃ at 20 min.Through analysis of hydrolysate component,soluble chemical oxygen demand(SCOD) mainly composed of protein(50%),carbohydrates(15% to 20%),volatile fatty acids(15% to 20%).The main component of nitrogen in the hydrolysate was organic-N.The ammonia concentration was 1.16 g/L under 165℃,50 min and then kept stable with reaction time and temperature increased.