Figure 4From: Enzymatic monitoring and control of a two-phase batch digester leaching system with integrated anaerobic filterTime course of the enzyme activity of hydrolases of the biofilm in the percolator. (a) Values of xylanase, cellulase, and amylase activities. (b) Values of aminopeptidase and protease activity. Depth 1 (D1) corresponds to a sampling of about 100 cm and depth 2 (D2) to approximately 20 cm below the surface. The data points are arithmetic means of two independent experiments, while the error bars denote the standard deviation.Back to article page