over emphasized that BMP analysis i

over emphasized that BMP analysis indicates the potential of substrates to produce methane under perfect laboratory conditions. It does not say how the substrate will behave in an actual digester. A co-digestion product may be toxic in higher doses than the small amount used in the BMP test.
If VS, COD, and BMP analyses reveal that a substrate is a good co-digestion product, then it is wise to determine maximum feeding rate of the material using an Anaerobic Toxicity Assay. Also, it is a good idea to pilot test – simulate the digester using a smaller reactor – before making any major changes to a digestion system.