One: The Principles of Bioconversion of Waste Materials.- 1 The enzymic treatment of waste materials.- 2 Processes with immobilized enzymes and cells.- 3 Solid substrate fermentation: a biotechnological approach to bioconversion of wastes.- 4 Composting processes.- Two: Bioconversion Applications.- 5 Bioprocessing of agro-residues to value added products.- 6 Use of photosynthetic bacteria for the production of SCP and chemicals from organic wastes.- 7 Utilization of starch industry wastes.- 8 Bioconversion of food processing wastes.- 9 Bioconversion of cheese whey to organic acids.- 10 Lignocellulosic wastes: biological conversion.- 11 Bioconversion of waste water from the pulp and paper industry.- 12 Fisheries waste biomass: bioconversion alternatives.- 13 Production of Bacillus thuringiensis biopesticides using waste materials.- 14 Biorecovery of metals from mining wastes.- Acknowledgements.- References.