The book examines the suitability of nanoscale zero-valent iron (ZVI) for degradation of agrochemicals for the purpose of developing a cost-effective treatment technology. It identifies by-products produced from the ZVI-mediated degradation process of particular contaminants, and clarifies the reaction mechanism by which ZVI degrades a chosen contaminant. It also assesses how the ZVI-based technology may be applied in complex, natural systems, the limitations to implementation, and possible avenues for further research which might improve the viability of the process.