Suchergebnisse

This volume presents the recent developments in the field of arsenic in soil and groundwater. Arranged into nine sections, the text emphasizes the global occurrences of arsenic in the environment, particularly on its source, pathways, behavior, and effects it has on soils, plants, water, animals, and humans. It also covers the diverse issues of arsenic in the mining environment, arsenic emanating from hydrothermal springs, and the geochemical modeling of arsenic adsorption to oxide surfaces. Finally, the text includes different cost effective removal mechanisms of arsenic from drinking water using natural red earth, solar oxidation, and arsenic oxidation by ferrrate. Written in simple English, and few technical terms, the book is designed to create interest within the countries with occurrences of arsenic in drinking water with an update the current status of knowledge on the dynamics of natural arsenic from the aquifers through groundwater to food chain and efficient techniques for arsenic removal. serve as a standard text book for graduate, postgraduate students and researchers in the field of Environmental Sciences and Hydrogeochemistry as well as researchers, environmental scientists and chemists, toxicologists, medical scientists and even for general public seeking an in-depth view of arsenic which had been classed as a carcinogen. bring awareness, among administrators, policy makers and company executives, on the problem and to improve the international cooperation

Cover -- Half Title -- Title Page -- Copyright Page -- Table of Contents -- About the book series -- Dedication -- Organizers -- Sponsors and Contributors -- Scientific Committee -- Foreword (Director General, Institute of Urban Environment, Chinese Academy of Sciences) -- Foreword (Vice President, China University of Geosciences, Beijing) -- Foreword (KTH Royal Institute of Technology) -- Foreword (Deputy Vice Chancellor, University of Southern Quensland) -- Foreword (Director, KWRWatercycle Research Institute) -- Foreword (Vice Chancellor and President, The University of Newcastle) -- Editors' foreword -- List of contributors -- Plenary presentations -- Sedimentological and hydro-biogeochemical processes controlling arsenic behavior in the Holocene and upper Pleistocene aquifers of the centralYangtze River Basin -- Groundwater Assessment Platform (GAP): A new GIS tool for risk forecasting and mitigation of geogenic groundwater contamination -- Arsenic biogeochemistry from paddy soil to rice -- Mechanism of As(III) S-adenosylmethionine methyltransferases and the consequences of human polymorphisms in hAS3MT -- Genetic susceptibility and alterations in relation to arsenic exposure, metabolism and toxicity -- Arsenic oral bioavailability in soils, housedust, and food: implications for human health -- Arsenic removal by iron-based nanomaterials -- Distribution of arsenic hazard in public water supplies in the United Kingdom - methods, implications for health risks and recommendations -- Section 1: Arsenic behaviour in changing environmental media -- 1.1 Sources, transport and fate of arsenic in changing groundwater systems -- AdvectAs challenge: multidisciplinary research on groundwater arsenic dissolution, transport, and retardation under advective flow conditions -- Arsenic in the Baltic Sea sediments - past, present, and future.

AbstractContaminated water with multiple contaminants, including As, Cr, Cu and Zn, was treated with a sorbent prepared by coating peat with Fe oxides. Because As has a relatively little explored market, the regeneration of the spent sorbent was not feasible. Meanwhile, the disposal of As wastes in landfills can cause landfill leachate treatment problems. Under the reducing conditions prevailing at landfills, As(V) is reduced to As(III), which is a toxic and more mobile form. In this study, incineration was explored as a management option to treat the spent sorbent that was loaded with As, Cr, Cu and Zn. The first objective of this study was to evaluate the leaching of these metal(loid)s from the ashes and compare it with the leaching from the spent sorbents before incineration. The second objective was to evaluate the leaching behaviour when the spent sorbent was co-incinerated with a Ca-rich additive (lime). To achieve these objectives, the obtained ashes were subjected to leaching tests, sequential extraction, and X-ray diffraction analyses. After the incineration, the ash content ranged from 9 to 19% of the initial mass of the spent sorbents. The leaching of As, Cu and Zn decreased compared with that from the spent sorbents before the thermal treatment because of the high incineration temperatures and/or co-incineration with lime. However, the leaching of Cr increased, which would hinder the disposal of the obtained ashes in a landfill because the limit value for disposal at a landfill for hazardous wastes was exceeded by 50 times. However, co-incineration with 10 wt% lime significantly decreased the leaching of Cr as a result of the formation of water-insoluble Ca-Cr compounds.

The Congress ""Arsenic in the Environment"" offers an international, multi- and interdisciplinary discussion platform for research aimed towards a holistic solution to the problem posed by the environmental toxin arsenic, with considerable societal impact. The congress has focused on cutting edge and breakthrough research in physical, chemical, toxicological, medical, agricultural and other specific issues on arsenic across a broader environmental realm. The Congress "Arsenic in the Environment" was first organized in Mexico City (As2006) followed by As2008 in Valencia, Spain, As2010 in Tainan