Pesticides
Pesticides

Author: Hamir S. Rathore

Publisher: CRC Press

Published: 2012-04-11

Total Pages: 663

ISBN-13: 1439836248

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Pesticides play an important role in controlling pests that carry diseases and threaten crop production. In recent years, however, there has been increased concern about the adverse impacts of pesticides and their degradation products on public health and the environment. A considerable amount of work is being done to develop nonchemical methods of pest control, but it is not yet feasible to dispense with the use of chemical pesticides. Pesticides: Evaluation of Environmental Pollution brings together, in a single volume, current knowledge on environmental pollution caused by pesticides. It helps readers evaluate the effects that pesticide residues have in all compartments of the environment. Featuring contributions by eminent scientists from around the world, the book gives an overview of the fate and transport of pesticides and their degradation in the environment. Detailing the sources, concentration, and hazards of residues, it examines their effects in humans, birds and mammals, fish, soil invertebrates, soil microflora, aquatic invertebrates, water, milk products, and more. The book also addresses endocrine-disrupting pesticides and explores biopesticides as alternatives to chemical pesticides. A review of data on the potential hazards of pesticides, this reference will be of interest to readers working in the areas of chemical crop protection and pollution management. It adds a balanced perspective to the debate between those who think that pesticides should be banned and those who consider the continued use of large quantities to be necessary for the survival of humanity. See also Handbook of Pesticides: Methods of Pesticide Residues Analysis (CRC Press, 2009).

Analysis of Selected Enhancements for Soil Vapor Extraction
Analysis of Selected Enhancements for Soil Vapor Extraction

Author:

Publisher: DIANE Publishing

Published: 1997

Total Pages: 246

ISBN-13: 1428903607

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This report provides an engineering analysis of, and status report on, selected enhancements for soil vapor extraction (SVE) treatment technologies. The report is intended to assist project managers considering an SVE treatment system by providing them with an up-to-date status of enhancement technologies; an evaluation of each technology's applicability to various site conditions; a presentation of cost and performance information; a list of vendors specializing in the technologies; a discussion of relative strengths and limitations of the technologies; recommendations to keep in mind when considering the enhancements; and a compilation of references. The performance of an SVE system depends on properties of both the contaminants and the soil. SVE is generally applicable to compounds with a vapor pressure of greater than 1 millimeter of mercury at 20EC and a Henry s Law constant of greater than 100 atmospheres per mole fraction. SVE is most effective at sites with relatively permeable contaminated soil and with saturated hydraulic conductivities of greater than 1 x 10 or 1 x 10 centimeter per second (cm/s). SVE by itself does not effectively remove contaminants -3 -2 in saturated soil. However, SVE can be used as an integral part of some treatment schemes that treat both groundwater and the overlying vadose zone. Enhancement technologies should be considered when contaminant or soil characteristics limit the effectiveness of SVE or when contaminants are present in saturated soil. The five enhancement technologies covered in this report are as follows and are described in the following subsections: * Air Sparging * Dual-phase Extraction * Directional Drilling * Pneumatic and Hydraulic Fracturing * Thermal Enhancement.