The process of biodegradation of hazardous and other compounds has been elucidated in this comprehensive book. It is a compilation of various research documents and procedures that pertain to the biodegradation compounds with contaminant characteristics while also focusing on specific products of varied interests as value added products or ones which facilitate following up of diverse biological processes. Contaminants are generated by numerous industrial processes like halogen compounds and by-products of the petroleum industry. On some occasions, natural calamities like tsunamis also give rise to such compounds which require intervention for recovery from damaged soils. Moreover, this book enlists topics that deal with special product degradation processes such as chlorophyll, corresponding to a biological process indicator like photosynthesis.