Solid or water wastes are resources from which monetary values can be derived. Food and agriculture industry hold enormous economic potential in the form of agricultural wastes. During the last few decades, world has become more aware of the consequences of environmental pollution and its impacts on human life. We have also witnessed public awareness of environmental influence of wastewater discharge. Therefore, the treatment and reuse of agricultural wastewater is essential to harness the true potential of agricultural waste. Irrigated agriculture yields 33% of the world's crop products and 50% return from worldwide crop production. However, in numerous areas of the world, particularly in arid and semiarid regions the future of irrigation based agriculture is endangered by existing or projected freshwater shortages. These water shortages essentially result from the ever-growing demand of water by rapidly growing global population and their elegant lifestyle. Water reuse (recycling), wastewater treatment and the utilization of treated sewage effluents for industry agriculture, and non-potable environmental and urban applications can offer a highly efficacious and sustainable approach to exploit water resources in regions afflicted by water shortage.This book consists of 8 chapters. All the chapters focus on modern methods and techniques regarding reuse and treatment of agricultural wastewaters.