Water Treatment by Green Coagulants—Nature at Rescue

Water purification and treatment are significant challenges for environmental engineers to several extents, continually increasing pressure to provide safe drinking water to the consumers. Nevertheless, water treatment with chemicals is minimized as they are toxic to the environment and humans. One of the fundamental steps for water treatment for consumption is water clarification by Coagulation and flocculation, eliminating colloidal particles, impurities, algae, etc. The sustainability in water treatment is only possible by the usage of natural materials combined with innate technologies. In these lines, the present book chapter will appraise the efficiency of natural coagulants’ in treating surface water. Several researchers tested the natural coagulants for water treatment; but, various natural coagulants and their coagulation efficiency were not presented. Thus, an attempt is made to achieve a comprehensive account of widely used different plant-based coagulants, to understand their properties and efficiencies in treating water. The approaches mentioned in the book chapter will develop a knowledge database on available coagulants and their best utility techniques that can be adopted at any given time.