Abstract
The effect of some clay minerals as support for methane production by an anaerobic process was studied. The clay minerals used were: natural sepiolite, treated sepiolite (both from Vallecas, Spain), vermiculite from Santa Olalla (Spain) and montmorillonite from Gador (Spain). Expanded polyurethane and PVC were also used in order to compare these materials, frequently used as supports in anaerobic digesters, and clay minerals. Treated sepiolite in suspension is the material that produces more methanobacteria. This is the only mineral able to fix the bacteria when it is in suspension. The best results for sedimentation are also obtained with this material. Magnesium released from the supports may play an important role in anaerobic digestion.
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