Introduction: Waste as a concept & importance of definition. Genesis of wastes: Industry-Agriculture system, Population boom vis-à-vis waste production. Classification of wastes: (i) State (solid, liquid, gaseous), (ii) Source (industrial, agricultural, medical, household, abattoirs), (iii) composition, Type (organic vs inorganic), degradability (degradable/non-degradable), hazard potential. Goals of waste management: source reduction, recycling, reuse, treatment, safe disposal. Organic Wastes: Types and composition of organic wastes (waste waters, sewage, sludge production, farmyard manure, chicken manure, biogas effluents, etc.) and their properties, composting techniques, Nutrient recycling for agriculture, forestry and recreational land, Biogas production.