Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Removal Of Cis 12 Dichloroethylene From Groundwater Using A Restored Wetland PDF full book. Access full book title Removal Of Cis 12 Dichloroethylene From Groundwater Using A Restored Wetland.
| Author | : Todd Douglas DeJournett |
| Publisher | : |
| Total Pages | : 326 |
| Release | : 2006 |
| Genre | : |
| ISBN | : |
| Author | : Nathan D. Clemmer |
| Publisher | : |
| Total Pages | : 159 |
| Release | : 2003-03 |
| Genre | : Constructed wetlands |
| ISBN | : 9781423503132 |
Widespread chlorinated ethene contamination of aquifers coupled with high costs of current treatment technologies demand innovative remediation solutions. Wetlands, maintaining anaerobic and aerobic zones promoting the complete degradation of chlorinated ethenes such as Tetrachloroethylene (PCE), could be the answer. This thesis characterized the chlorinated solvent contamination levels in three strata of an upward flow constructed wetland. Analysis of samples was accomplished by purge-and-trap gas chromatography. Water quality parameters, Dissolved Oxygen (DO), Oxidation Reduction Potential (ORP), pH, Conductivity, and Temperature, were also measured in monitoring wells with a water monitoring sonde. After removing data outliers caused by short-circuiting flow, PCE concentrations declined from an average of 32,59 +/- 0,699 ppb (+/- 95% confidence interval) in the inflow stream to an average of 0.171 +/- 0.079 ppb in the upper layer (99,3% reduction). Concentration trends of PCE degradation products cis-1,1 -Dichloroethylene (cis-DCE), Vinyl Chloride (VC), and Trichloroethylene TCE) indicate dechlorination processes are occurring. In addition to PCE, TCE at concentrations below 0,6 ppb was the only other analyte detected in the inflow and outflow, Water quality measurements (DO and 0RP) decreased from the bottom to the middle layer to a level that supports anaerobic reductive dechlorination but not methanogenesis. The DO increased slightly from the middle to the top layer while 0RP continued to decrease.
| Author | : Thomas Jay Slusser |
| Publisher | : |
| Total Pages | : 276 |
| Release | : 2001 |
| Genre | : Groundwater |
| ISBN | : |
| Author | : Commission on Geosciences, Environment, and Resources |
| Publisher | : National Academies Press |
| Total Pages | : 289 |
| Release | : 2000-08-31 |
| Genre | : Science |
| ISBN | : 0309069327 |
In the past decade, officials responsible for clean-up of contaminated groundwater have increasingly turned to natural attenuation-essentially allowing naturally occurring processes to reduce the toxic potential of contaminants-versus engineered solutions. This saves both money and headaches. To the people in surrounding communities, though, it can appear that clean-up officials are simply walking away from contaminated sites. When is natural attenuation the appropriate approach to a clean-up? This book presents the consensus of a diverse committee, informed by the views of researchers, regulators, and community activists. The committee reviews the likely effectiveness of natural attenuation with different classes of contaminants-and describes how to evaluate the "footprints" of natural attenuation at a site to determine whether natural processes will provide adequate clean-up. Included are recommendations for regulatory change. The committee emphasizes the importance of the public's belief and attitudes toward remediation and provides guidance on involving community stakeholders throughout the clean-up process. The book explores how contamination occurs, explaining concepts and terms, and includes case studies from the Hanford nuclear site, military bases, as well as other sites. It provides historical background and important data on clean-up processes and goes on to offer critical reviews of 14 published protocols for evaluating natural attenuation.
| Author | : National Research Council |
| Publisher | : National Academies Press |
| Total Pages | : 423 |
| Release | : 2013-02-27 |
| Genre | : Nature |
| ISBN | : 0309278139 |
Across the United States, thousands of hazardous waste sites are contaminated with chemicals that prevent the underlying groundwater from meeting drinking water standards. These include Superfund sites and other facilities that handle and dispose of hazardous waste, active and inactive dry cleaners, and leaking underground storage tanks; many are at federal facilities such as military installations. While many sites have been closed over the past 30 years through cleanup programs run by the U.S. Department of Defense, the U.S. EPA, and other state and federal agencies, the remaining caseload is much more difficult to address because the nature of the contamination and subsurface conditions make it difficult to achieve drinking water standards in the affected groundwater. Alternatives for Managing the Nation's Complex Contaminated Groundwater Sites estimates that at least 126,000 sites across the U.S. still have contaminated groundwater, and their closure is expected to cost at least $110 billion to $127 billion. About 10 percent of these sites are considered "complex," meaning restoration is unlikely to be achieved in the next 50 to 100 years due to technological limitations. At sites where contaminant concentrations have plateaued at levels above cleanup goals despite active efforts, the report recommends evaluating whether the sites should transition to long-term management, where risks would be monitored and harmful exposures prevented, but at reduced costs.
| Author | : National Research Council |
| Publisher | : National Academies Press |
| Total Pages | : 300 |
| Release | : 1994-02-01 |
| Genre | : Nature |
| ISBN | : 0309051428 |
As demand for water increases, water managers and planners will need to look widely for ways to improve water management and augment water supplies. This book concludes that artificial recharge can be one option in an integrated strategy to optimize total water resource management and that in some cases impaired-quality water can be used effectively as a source for artificial recharge of ground water aquifers. Source water quality characteristics, pretreatment and recharge technologies, transformations during transport through the soil and aquifer, public health issues, economic feasibility, and legal and institutional considerations are addressed. The book evaluates three main types of impaired quality water sourcesâ€"treated municipal wastewater, stormwater runoff, and irrigation return flowâ€"and describes which is the most consistent in terms of quality and quantity. Also included are descriptions of seven recharge projects.
| Author | : Hans F. Stroo |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 421 |
| Release | : 2012-10-02 |
| Genre | : Technology & Engineering |
| ISBN | : 1461441153 |
This volume provides a review of the past 10 to 15 years of intensive research, development and demonstrations that have been on the forefront of developing bioaugmentation into a viable remedial technology. This volume provides both a primer on the basic microbial processes involved in bioaugmentation, as well as a thorough summary of the methodology for implementing the technology. This reference volume will serve as a valuable resource for environmental remediation professionals who seek to understand, evaluate, and implement bioaugmentation.
| Author | : |
| Publisher | : |
| Total Pages | : 1400 |
| Release | : 1992 |
| Genre | : Government reports announcements & index |
| ISBN | : |
| Author | : Sharon E. Kroening |
| Publisher | : |
| Total Pages | : 122 |
| Release | : 2004 |
| Genre | : Earth sciences |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 286 |
| Release | : 1994 |
| Genre | : Chlordan |
| ISBN | : |
