中文摘要：

采用水热法处理含有机质较高的食品加工废水处理厂剩余污泥,以期实现污泥减量并改善污泥脱水性能。研究结果表明,水热反应温度和反应时间对污泥减量影响较大,污泥初始含水率对污泥减量影响较小。污泥减量的最佳反应条件为：反应温度为220℃,反应时间为3 h,污泥初始含水率为84%;在此条件下,通过物料衡算分析可知,污泥湿重减量达到72.9%,污泥干重减量达到31.2%,污泥VSS降解率达到35.5%,水热反应结束并抽滤脱水后污泥含水率降至59.4%,所得脱水滤液ρ（COD）可达38.2 g/L且含有一定氮磷浓度,经测算该脱水滤液回流到废水处理系统时对废水处理负荷无明显影响。水热处理对食品加工废水厂剩余污泥具有显著的减量及改善脱水性能的效能。

英文摘要：

In order to achieve sludge reduction and improve the property of sludge dewatering,the excess sludge with higher organic matter,produced by biological treatment of food processing wastewater,was treated by the hydrothermal method. The results showed that hydrothermal reaction temperature and reaction time have significant effect on the sludge reduction,while initial water content of sludge was margin. Additionally,the optimum parameters for sludge reduction were at 220℃,reaction time of 3h with initial water content of 84%. Under the optimal conditions,from mass balance point of view,it showed that wet weight reduction of sludge was above 72. 9%,dry weight reduction of sludge was above 31. 2%,sludge VSS degradation rate reached up to 35. 5%,the water content of sludge after hydrothermal reaction and filtration dehydration dropped to59. 4%,COD concentration in the filtrate was about 38. 2g/L,in addition,the filtrate also contained a certain concentration of nitrogen and phosphorus. However,there was no significant effect on the load of food processing wastewater treatment when the dehydration filtrate returned to the wastewater treatment system. So hydrothermal treatment could reduce significantly the excess sludge produced by biological treatment of food processing wastewater,and improve its dehydration property greatly.