One of the most pressing concerns in using bed material
fixed-zeolite system for anaerobic digestion of ammonium-rich
substrate is selection of the most appropriate material for zeolite
fixation. In order to improve the performance of anaerobic digestion
of ammonium-rich livestock wastes, on one hand, the ammonium
removal efficiency is of great importance and indispensable
should be ensured by the sufficient contact between the zeolite
absorbent and the digestate. On the other hand, the quantity of
immobilized methanogens should be increased as the immobilized
microbes have higher activity and tolerance to unfavorable environmental
conditions. Thus, the selection of an appropriate bed
material is very important to ensure the system’s effectiveness
and success