| 城市污水污泥微波热水解特性研究 |
| 摘要点击 7223 全文点击 2690 投稿时间：2007-01-27 修订日期：2007-03-14 |
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| 中文关键词 污泥 微波 热水解 |
| 英文关键词 sludge microwave thermal hydrolysis |
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| 中文摘要 |
| 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 450MHz，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5～10min，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5min氮的水解率达到67%.150℃和170℃热水解10min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%. |
| 英文摘要 |
| Sewage sludge thermal hydrolysis experiments with 2 450MHz microwave energy were carried out under 80～170℃ with 1～30min. Max. microwave output power was 1kW. 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 5min, 15.8% and 29.4% VSS dissolved respectively. While, with 10min 19.07% and 25.75% COD moved to liquor. Release of organic materials increased liquid sludge COD and TOC concentration. Under 170℃ with 10min, COD and TOC concentration were 9 860.0 mg/L and 2 949.70 mg/L respectively. More than 5 to 10min, 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 5min. 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 10min microwave hydrolysis. Accordingly, sludge amount reduction ratios were 33.9% and 51.7% respectively. |
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