Suchergebnisse

This book unveils the myriad streams of ecocentric thoughts that have been flowing through the human mind - in indigenous communities, in the wisdom of philosophers, in the creative expressions of poets and writers - sometimes latent, but sometimes more explicit.

Introduction to environmental studies -- Ecosystems -- Natural resources: renewable and non-renewable resources -- Biodiversity: threats and conservation -- Environmental pollution -- Environmental policies, practices and global issues -- Human communities and the environment -- Field work in environmental studies.

AbstractIpomoea aquatica—an aquatic macrophyte—could remove chromium and manganese from their mixtures after 96 h exposure at a maximum rate of 82.8% and 93.9%, respectively, in microcosms. The removal rates were higher (90.4% and 94.5%, respectively) after 96 h exposure in mesocosms with gravel beds and vertical subsurface flow. The higher removal rates in mesocosm were probably due to a wide range of partitioned micro‐environments close to the root boundaries, and within the biofilms on both root and gravel surfaces. The Cr and Mn removal efficiencies of I. aquatica increased with increasing Cr or Mn concentrations in the medium. The study reveals the potential of I. aquatica—a fast‐growing species that can proliferate by fragmentation—to effectively remove Cr and Mn within a relatively short period of time, thereby raising the prospect of its use in phytoremediation of wastewater contaminated with these metals.

Papers presented at a symposium on "Sustainable development of water resources in Barak Valley", organized by Silchar Centre of the Institute of Northeast India Studies at Assam University on Mar. 24, 2010