The pH was measured with a Horiba D-55 pH-meter. Slurry samples were analyzed for volatile fatty acids [VFA] (acetic, propionic, butyric acid and formic acids)
The pH was measured with a Horiba D-55 pH-meter. Slurry samples were analyzedfor volatile fatty acids [VFA] (acetic, propionic, butyric acid and formic acids)