One of major drawback of industrial revolution is water pollution. Among many organic Hazardous compounds, the most notorious is the pesticides pollution. The persistence, toxicity and degraded products of organophosphorus pesticides have a serious environmental and public health concerns. So, the wastewater generated during pesticide production must be effectively treated before disposal, because improper disposal may lead to contamination of soil and water systems. This book provides complete methodologies, results and achievements which are enough to achieve need based treatment system with respect to organophosphorus pesticides. This book, in particular would help researchers to design water treatment systems for industries. Material presented in this book is based on the experimental study conducted to decompose organophosphorus pesticides. Therefore, this research can be applied to design a low cost system for the treatment of industrial effluents containing hazardous organic compounds.