Composition of and contaminants in anaerobic fermentation residues

This study analyzed the composition of the anaerobic fermentation residues(AFR) from different biogas digesters to provide data for the safe utilization of the material.The results showed that ① all nutrients in the biogas liquid were significantly lower than those in the sediment,especially in regard to the organic matters,humic acid,crude fiber,vitamin C and dry matters found in the liquid which were merely 2-5% of those in the residue;② the hygienic indices of the biogas liquid were significantly better than those of the residue,the harmful components in the fluid were significantly less than the residue.