biological wastes waste disposal services 25 composts 23 biofuels 13 treatment 7 recycling of wastes 6 fermentation 5 more ... wastes 5 biomass 4 fertilizers 4 unconventional energy sources 4 exploitation 4 house-hold wastes 3 secondary raw materials 3 municipalities 3 fertilization 2 sludge management 2 legal regulations 2 storage of wastes 2 wine industry 2 production 2 agricultural wastes 2 anaerobid waste water treatment 1 biochemical processes 1 biochemistry 1 biomethan 1 bioreactors 1 chemical industry 1 sugar industry 1 grants 1 less ...