城市污水污泥微波热水解特性研究  

Sewage Sludge Microwave Thermal Hydrolysis Process

作　　者：乔玮[1] 王伟[1] 黎攀[1] 荀锐[1] 

机构地区：[1]清华大学环境科学与工程系,北京100084

出　　处：《环境科学》2008年第1期152-157,共6页Environmental Science

基　　金：国家高技术研究发展计划(863)项目(2006AA06Z384)

摘　　要：在80-170℃进行1-30 min的城市污水污泥微波热水解，微波频率2 450 MHz，最大输出功率1 kW，考察挥发性悬浮固体（VSS）和悬浮固体（SS）溶解率，污泥上清液COD和TOC浓度、污泥粒径、形态变化和碳氢氮含量等污泥热水解特征，分析污泥离心脱水性能的改善和减量化效果.结果表明，微波加热使污泥有机物水解反应快速发生，水解过程受温度影响显著.热水解5 min时，150℃和170℃的VSS溶解率为15.8%和29.4%；10 min时COD溶解率达到19.07%和25.75%，COD和TOC浓度在170℃分别为9 860.0 mg/L和2 949.70 mg/L.超过5-10 min，VSS和COD水解率增加缓慢.通过扫描电镜（SEM）观察到污泥热水解后菌体细胞破裂.与碳和氢相比，污泥中氮的水解率更高，170℃微波热水解5 min氮的水解率达到67%.150℃和170℃热水解10 min离心脱水污泥含水率降低到73.1%和65.5%，脱水性能改善，相应减量化率为33.9%和51.7%.Sewage sludge thermal hydrolysis experiments with 2 450 MHz microwave energy were carried out under 80 - 170℃ with 1 - 30 min. Max. microwave output power was 1 kW. Volatile suspended solid （VSS） dissolving ratio, COD dissolving ratio, liquor COD and TOC, sludge particle size distribution, micro-structure, and elements（C, H and N） hydrolysis were measured. Also, sludge dewaterability improvement was inspected. Results show that microwave heating leads fast sludge hydrolysis reaction. Temperature was the controlling process factor. Under 150℃ and 170℃ with 5 min, 15.8% and 29.4% VSS dissolved respectively. While, with 10 min 19.07% and 25.75% COD moved to liquor. Release of organic materials increased liquid sludge COD and TOC concentration. Under 170℃ with 10 min, COD and TOC concentration were 9 860.0 mg/L and 2 949.70 mg/L respectively. More than 5 to 10 min, VSS and COD dissolving trend turned slow down. SEM test showed cell disruption of hydrolyzed sludge. N could dissolve more easily than C and H. 67% N hydrolysiszed under 170℃ with 5 min. Bacterial cell disruption and organic solid hydrolysis improved sludge dewaterability. Sludge cake moisture content decreased from 82 % to 73.1% and 65.5% under 150℃, 170℃ with 10 min microwave hydrolysis. Accordingly, sludge amount reduction ratios were 33.9% and 51.7% respectively.

关 键 词：污泥 微波 热水解 

分 类 号：X705[环境科学与工程—环境工程]