Natural Materials and Methods Used in Water Purification: A Review

The review article presents the prevalent water problems; from needs, scarcity, management, pollution and the risk associated with waterborne disease. It also discusses the remediation methods using natural materials such as clay, activated carbon, zeolites, sand, rice husk, chitosan, hydroxyapatite, LECA, to combat the microbial, organic and inorganic pollutants. It includes insights from papers collected from original research work and reviews that covers the areas of study. The review serves as a guide to the authors who are working on the development of modified expanded clay aggregates for multiple contaminants removal.