REMOVAL OF FLUORIDE, ALKALINITY, HEAVY METALS AND SUSPENDED SOLIDS SIMULTANEOUSLY - ADSORBENT SYNTHESIS, ADSORBENT COMPOSITION AND A DEVICE FOR AFFORDABLE DRINKING WATER

摘要

The present invention reveals a novel natural polymer mediated self-sustained combustion synthesis method for preparing extremely fine nano-magnesia and its application in drinking water purification. This invention also related to the development of a purification device for drinking water application. The device consists of a two stage filtration system to remove fluoride, alkalinity, heavy metals from drinking water and control the alkaline pH of the fluoride removed water. The filter system comprises of a batch mixing unit followed by a fixed bed unit. The treatment method involves mixing fluoride contaminated water with nano-magnesia in a batch reactor followed by settling of fluoride sorbed nano-magnesia. The second part of the system consists of a sand bed followed by manganese oxide-coated activated alumina (supported manganese oxide was prepared either in bulk or nano form) fixed bed through which the water from the first stage flows and controls the suspended solids and pH of the water within the limit. This device is also capable of removing heavy metals and bacteria as well.