对沼气池的最基本的要求是不漏水、不漏气。但目前农村中修建的沼气池结构层大部分采用混凝土、砖、石等建筑材料,这些材料均有相当数量的大小不同的微细孔隙,而这些孔隙大多是非闭合的。在一定的沼气压力下,沼气很容易通过这些孔隙渗漏出去,因此,必须在沼气池内表面涂抹密封材 The most basic requirement for biogas digesters is no leakage and no leakage. However, most of the biogas digesters constructed in rural areas use concrete, brick, stone and other construction materials. These materials have a considerable amount of tiny pores with different sizes, and most of these pores are non-closed. In certain biogas pressure, biogas can easily leak out through these pores, therefore, it is necessary to apply sealing material on the inner surface of the digester