alternative to or in addition to the preferred use of the centrifuge 46 the oil concentration within the hydrolysate 25 can be diluted by addition of other waste streams to absorb the excess oils for example a bulking agent 47 may be blended into the hydrolysate a most preferred bulking agent is chicken feathers preferably pulverized or otherwise comminuted into a pulp or finely shredded consistency chicken feather are an ideal bulking agent in that they have a high ph and readily absorb oils while adding solids to the hydrolysate mixture in addition dry animal manures can act as bulking agents to absorb the excess oils and water from the hydrolysate other slaughter wastes from poultry spent hens hogs and cattle mortalities and slaughter waste could also be utilized to provide increased nutrient levels ph control and slow nitrogen release qualities with the high ph of the chicken feathers base additives are minimized or not required as would be needed to neutralize the cake from the prior addition of the acid 32 the cake 43 is the residual substrate of the fish hydrolysate 25 after the oils 41 and stick water 42 are extracted from the centrifuge 46 the cake is transferred to a blender 48 a primary purpose of the blender is for a nutrient.