(Spain) being composed by green peas, maize, carrots and leeks
(25:25:25:25, dry weight (dw)). This residue was minced into particles
of about 1 mm size in a mill fruit. Mesophilic anaerobic
sludge (AS), collected in the wastewater treatment plant of Valladolid
(Spain), was used as inoculum. Table 1 shows SM, VPW and
AS chemical composition