域市污水厂污泥直接热化学液化制油过程研究

Study on the Process of Converting Municipal Sewage Sludge into Oil by Direct Thermochemical Liquefaction

城市污水厂污泥是城市污水处理过程中，无法避免的二次污染物．以直接热化学液化技术处理此种污泥是其处理技术的最新发展之一，直接热化学液化过程具有处理与能源利用双重性质．文中介绍了以间歇反应釜对其进行实验室研究的一些结果，发现在反应温度２５０～３００℃的范围内，每千克挥发性固体（ＶＳ）可得油０．４～０．４４ｋｇ，相应的有机质转化率为７０％～８０％，过程能量消费比小于１，指示过程为净得能的．处理过程废水ＣＯＤ约４０ｇ·Ｌ－１，但具有类似于城市污水的生化可降解性，可回流污水厂处理．

Municipal sewage sludge is an unavoidable secondary pollutant which comes from the process of municipal sewagewtreatment .The didectrthermochemical liquefaction technology is a new treatment method of sludgese sposalowhich has the advantage of both treatment and energy recovery. In this article,some experimental results from a batch reactor are discussed. The results show that between reaction temperatures of 250～300℃,toil yields 0.4～0.44 kg/kg VS and organic conversion yields 70%-80%. Energy cconsumption ratio of the process is less than unity, indicating that the poocesssis met energy producer. The COD value of the wastewater from the process is about 40g·L-1, which has the same biodegradability as the municipal sewage itself.