Environmental Engineering About the Author Prof. Dr N. S. Varandani had a long academic career spanning over 30 years. He hadbeen teaching different subjects of Environmental Engineering at the Department ofEnvironmental Engineering, L. D. College of Engineering, since 1988.He has guided more than 100 theses of master degree, published technical papers innational journals and delivered expert lectures on different environmental issues.He was the recipient of Dr Vikram Sarabhai Award for Science and Technology, 2009for developing “Integrated Air Pollution Control System for Foundry Industry” and was a member of several government and non-government organisations contributingtowards environment protection and management.