Ultrafiltration technology has been widely used in many fields such as water purification, chemical separation, pharmaceutical production, food processing, seawater desalination pre-treatment, and more. This book provides new research on the processes and uses of ultrafiltration. Chapter One reviews the preparation and application of hollow fibre ultrafiltration membrane. Chapter Two details the ultrafiltration of surfactin (lipopeptide), one of the most well-known biosurfactants and suggests a similar process for mannosylerythritol lipids (glycolipid), one of the most prominent biosurfactants. Chapter Three provides an overview on ultrafiltration in food processing. Chapter Four addresses a suitable methodology for fouling control on an ultrafiltration membrane. Chapter Five discusses the effect of anions on the removal of mercury(II) using FeS-supported crossflow ultrafiltration.