污泥高温热水解预处理的影响条件及机理研究

Study on Affecting Factors and Mechanism of the Sludge Thermal Hydrolysis Pretreatment Process

从热水解的原理出发,通过试验考察了热水解温度、时间以及热水解后不同闪蒸压差对厌氧消化性能的影响.通过热水解前后污泥中的SCOD （soluble chemical oxygen demand）等指标的变化分析热水解的影响机理.结果表明,最适宜的热水解条件为170℃,30 min.在两级闪蒸且0.7～0.1 MPa的闪蒸压差下热水解污泥的产气能力最佳.在此条件下,热水解后污泥的SCOD相对增加了21.9％,粘度相比下降了92.8％,污泥中的微生物解体,灭菌效果良好,符合安全卫生要求.

According to the principle of thermal hydrolysis, the effects of temperature, time on anaerobic digestion efficiency, the changes of soluble chemical oxygen demand （SCOD） before and after the reactions were investigated. The results show that the optimum conditions for thermal hydrolysis were 170℃ and 30 min,and the sludge gas production capability is the best with twice-flash pressure and 0. 7 - 0. 1 MPa of pressure reduction differential. Under these conditions, SCOD after thermal hydrolysis is increased by 21.9%, and viscosity decreased by 92. 8%. Moreover, the microorganisms of sludge is disintegrated and sterilization effect is good that complied with safety and health requirements.