Dr. Suresh Kumar Nath
Assistant Professor, Dept. of Chemistry, Kokrajhar Govt. College
Kokrajhar, Assam, India
Title of presentation: Fluoride Contamination Of Groundwater, Its Origin And Remedies
The groundwater of many parts of the world is contaminated with excess of fluoride and people are consuming fluoride with drinking water. Thousands of people in the world are affected by fluorosis, especially in India, China, Pakistan and Thailand. The problem is particularly acute in several parts of India as its vast areas are fluoride-affected. Long-term drinking of water containing high fluoride content can lead to various manifestations of fluorosis, such as, mottling of teeth, softening and bending of bones, and ossification of tendons and ligaments. The low-cost method, viz., lime-alum or Nalgonda technique, commonly used in the third world countries, adds harmful aluminum to water and often increases the pH of water above permissible limit in the process. On the other hand, the removal efficiency and applicability of the existing fluoride removal methods depends on various factors such as location specific mineral concentrations in water and geographical and economic conditions. Limestone is a potential material for removal of fluoride if Ca2+ activity can be increased in solution. This paper describes the problem of fluoride menace, its origin and some solution methods based on limestone defluoridation.
Dr Nath completed his doctorate in Chemistry from Tezpur University, Assam, India in 2011; where he did research on water treatment technology development. During PhD he contributed to the development of methods for fluoride and arsenic removal from contaminated water. Two methods namely FLUOIDE NILOGON and ARSIRON NILOGON are now being applied in the practical field of fluoride and arsenic affected areas of Assam and various places of India. Recently the methods are recognized by Indian Patent Office, Kolkata and two patents have been granted. After PhD Dr Nath worked in Nagaland University for few months as an ad-hoc faculty and from August 2012 he is working in Kokrajhar Govt. College, Assam India.