城市污水厂污泥的浸泡油炸

提出了一种利用餐厨废油为热交换介质，在常压下对城市污水厂污泥进行油炸干化制成固体燃料，以实现城镇两大废弃物一污泥和餐厨废油综合处置的方法。以大豆油模拟餐厨废油，研究了污泥油炸干燥特性及过程影响参数。实验结果表明，污泥经油炸干化后，干基含水率从初始的4．56kg／kg降低至0．05kg／kg，干基含油率升为0．37～0．47kg／kg，干污泥热值达到21．551～24．082MJ／kg，是一种高热值固体燃料。油温对污泥油炸干化过程影响显著，当油温从120℃升至180℃时，污泥干燥时间从28min缩短至4min。实验条件下，1t餐厨废油可处理约8．3t湿污泥。

Immersion frying of municipal sewage sludge

Spent cooking oil was used as the heating medium to dry wet sewage sludge using the immersion frying method to convert the wet sludge into a solid fuel. A laboratory scale test facility was designed and used to examine the effect of key operating parameters on the fry-drying process. Under the test conditions employed, the dry basis moisture content of the sludge could be reduced from the initial level of 4.56 kg/kg to least 0.05 kg/ kg, while the oil content on dry basis increased from 0.37 kg/kg to 0.47 kg/kg. The calorific value of the dried sludge reached 21. 551 ~ 24. 082 MJ/kg, indicating that the dried sludge can be considered a solid fuel with good calorific value. It is noted that the oil temperature is the key governing parameter in the immersion frying process; when the oil temperature varied from 120℃ to 180℃ , the drying time was shortened from 28 min to just 4 min. Under this experimental condition, 1 ton waste cooling oil can process about 8.3 tons of wet sludge.