城市污泥两种低温协同干化法的比较研究  

Comparison of Two Sewage Sludge Low Temperature Drying Methods

作　　者：韩媚玲 朱芬芬[1] 张荣岩 董仪 HAN Mei-ling;ZHU Fen-fen;ZHANG Rong-yan;DONG Yi(School of Environment&Natural Resources,Renmin University of China,Beijing 100872,China)

机构地区：[1]中国人民大学环境学院,北京100872

出　　处：《中国给水排水》2020年第17期57-61,共5页China Water & Wastewater

摘　　要：污泥包含大量有机质,通过索氏提取法和超声波提取法可提取污泥中脂质;此外还发现,该过程可同时降低污泥渣含水率,达到污泥低温干化的效果。从不同角度探究了索氏提取和超声波提取法的最佳反应条件。结果表明,索氏提取法的最佳条件如下:提取剂正己烷与乙醇的体积比为1∶1、固液比为1∶20、提取温度为75℃、提取时间为8 h,最佳提取条件下脂提取率可达到22%,污泥渣含水率降至5%~10%;超声波提取法最佳条件如下:功率密度为0.2 W/cm^3、固液比为1∶20、提取时间为30 min、提取温度为50℃,最佳提取条件下脂提取率也可达到22%,污泥渣含水率降至50%~60%。Sewage sludge contains abundant organic matters.Lipid in the sludge can be extracted by Soxhlet extraction method and ultrasonic extraction method.Meanwhile,it is also found that this process could simultaneously reduce the moisture content of the sludge residue and achieve the effect of low-temperature drying of the sludge.The optimal reaction conditions of Soxhlet extraction and ultrasonic extraction were explored from different perspectives.The optimal reaction conditions of Soxhlet extraction method were as follows:volume ratio of n-hexane and ethanol of 1∶1,solid-liquid ratio of 1∶20,extraction temperature of 75℃,and extraction time of 8 hours.Under the above conditions,the extraction rate of lipid was up to 22%,and the moisture content of the sludge residue was reduced to 5%-10%.The optimal extraction conditions of ultrasonic extraction method were as follows:power density of 0.2 W/cm^3,solid-liquid ratio of 1∶20,extraction time of 30 min,and extraction temperature of 50℃.Under the optimal extraction conditions,the extraction rate of lipid could reach 22%,and the moisture content of the sludge residue could be reduced to 50%-60%.

关 键 词：城市污泥 低温热干化 索氏提取法 超声波提取法 

分 类 号：TU992[建筑科学—市政工程]