Method for treating biochemical sludge by thermal hydrolysis pretreatment

The invention discloses a method for treating biochemical sludge by thermal hydrolysis pretreatment. The method comprises (1) diluting biochemical sludge through water so that the solid content of thebiochemical sludge is in a range of 5-15%, (2) thermally hydrolyzing the biochemical sludge obtained in the step (1) and after the reaction, naturally cooling the product to the room temperature, (3)adjusting the biochemical sludge obtained in the step (2) and (4) press-filtering the biochemical sludge obtained in the step (3) through a plate-and-frame filter press to obtain dehydrated sludge. The method has simple processes. The pretreated sludge has low viscosity and strong fluidity and is conducive to post-treatment on the biochemical sludge. 本发明公开了种采用热水解预处理工艺对生化污泥进行处理的方法。该方法的具体步骤如下：(1)用水稀释生化污泥，使得生化污泥的含固率在5-15％之间；(2)将步骤(1)得到的生化污泥进行热水解，反应结束后，发然冷却至室温；(3)将步骤(2)得到的生化污泥进行调理；(4)将步骤(3)得到的生化污泥用板框压滤机压滤，得到脱水后污泥。本发明的有益效果在于：该方法简单，预处理后的污泥粘度降低，流动性增强，有利于生化污泥的后处理。