Arsenic Removal from Contaminated Groundwater

Contamination of groundwater with arsenic is being considered a pervasive and critical issue in recent years. Large areas in India, Bangladesh, South East Asia, and other parts of the world are suffering from this problem. Arsenic Removal from Contaminated Groundwater presents a comprehensive discussion on various important issues, including state-of-the-art arsenic removal technologies, preparation and performance analysis of laterite, and scale-up issues and design of a household filter. It also expounds the potentiality of raw laterite and treated laterite as low-cost arsenic adsorbents. The efficiency of adsorbent capacity is evaluated using real arsenic contaminated groundwater collected from an affected area in West Bengal, India. The topic is an emerging area and most of the work presented has the potential of field application.

Key Features:
Detailed description of hydrogeochemistry of arsenic-contaminated groundwater
Coverage of technologies of arsenic removal from contaminated groundwater using laterite-based adsorption technique
Significant insight on scale-up and design aspects of household and community filtration systems
Unique focus on the preparation and performance of raw laterite and treated laterite for arsenic removal

Contents:
Arsenic in groundwater and its health effects
Health Hazards of Arsenic
Social Impact of Arsenicosis

Hydrogeochemistry of arsenic-contaminated water
Arsenic Chemistry
Sources of Arsenic and Environmental Impacts
Physico-chemical Processes Involved in Arsenic Mobilization
World Scenario of Arsenic Pollution in Water
Groundwater Hydrochemistry
Scenario of Arsenic in Deep Groundwater (>150 m) and its Hydrogeochemistry

Arsenic removal processes and advantages of the adsorption process
Oxidation
Chemical Coagulation Precipitation and Electrocoagulation
Ion Exchange
Membrane Technology
Adsorption
Literature Review on Various Adsorbents used for Arsenic Removal Studies
Prospect of Raw Laterite as an Arsenic Adsorbent
Treated/Modified Laterite as a Potential Arsenic Adsorbent
Organization of Experimental Work for Arsenic Laterite System

Application of raw laterite as an arsenic adsorbent
Experiment
Results and Discussion

Application of acid-treated laterite as an arsenic adsorbent
Experiment and Methodology
Results and Discussion

Application of acid base treated laterite as an arsenic adsorbent
Materials and Analysis
Preparation of Acid Base Treated Laterite and the Optimization of Treatment Process
Characterization of Treated Laterite
Chemical Reactions Involved during the Preparation of Treated Laterite
Batch Mode Arsenic Adsorption on Treated Laterite
Batch Kinetic Modelling of the Treated Laterite/Arsenic System
Adsorption of Arsenic Species in a Binary System
Effect of other Ions on As(III) and As(V) Adsorption
Fixed-bed Column Study
Comparison of Adsorption Capacity of Treated Laterite with other Adsorbents
Scale up for Preparation of Treated Laterite and Performance of Household Filter using Contaminated Groundwater
Leaching Study of Fresh Treated Laterite and Arsenic Adsorbed Treated Laterite