Damage to biogas plants from internal desulfurization Many experts now recommend completely avoiding desulfurization in the fermenter. The reason is enormous damage to roof structures leading to complete collapse, and subsequently to agitators, tanks, etc. With desulfurization using SH SULPHTEC, you are on the safe side. Important information can be found here: Text Dipl.-Ing. Detlef Krause - Expert office for wood and moisture damage.