Author: Rebekah L. DoylePublisher:
ISBN:
Category :
Languages : en
Pages : 109
Book Description
In-situ Soil Lead Remediation
Author: Rebekah L. DoyleProviding Solutions for a Better Tomorrow
Author: Recent Developments for in Situ Treatment of Metal Contaminated Soils
Author: Publisher: DIANE Publishing
ISBN: 1428903763
Category : In situ remediation
Languages : en
Pages : 64
Book Description
Application of In-situ Remediation by Using Soil Phosphate Amendments at Three Lead Contaminated Soil Sites (residential Yards) in New Orleans, LA.
Author: Dhary Saad AlkandaryPublisher:
ISBN:
Category : Apatite
Languages : en
Pages : 396
Book Description
Lead (Pb) contamination of soil continues as a threat to public health. The problem exists, in part,due to the abundance of lead in soil in certain contexts which has the potential to cause adverse health effects in children at relatively low exposure levels. The dominant source of lead in soils in the city of New Orleans, in the older urban areas close to residences, is old deteriorated lead-based paint. A cost-effective intervention method to address the problem of lead in these soils is needed to reduce the Pb exposure risk for people in these areas. Excavation and removal of lead (Pb) contaminated soils has been widely used as a remediation technique whereby the contaminated soil is removed, transported to a suitable landfill site, and clean soil is used to replace excavated soil. However, the cost of this "dig and dump" method is high, and the availability of an appropriate landfill may be problematic. Several alternative, low-cost, and effective methods are now being used to remediate lead contaminated soils. In situ methods involve the treatment of soil in the contaminated locations. The treatment technique is based on adding a chemical stabilization agent to the soil in such manner as to immobilize the contaminants. A chemical stabilization amendment that is widely used phosphate, as it has the ability to combine with metal contaminants and form a stable mineral that is sparingly soluble, and stable in low pH conditions (such as in the human stomach). The phosphate amendment is used in lead (Pb)-contaminated soils for several reasons. Namely, it combines with soluble Pb ions in the soil to form an insoluble crystalline lead phosphate mineral (pyromorphite). Also, pyromorphite has a low solubility product (Ksp) of approximately 10−80 so remains in the soil as immobile mineral. Apatite II is a biogenic phosphate, fish bones that can be applied to soil and it has been the focus of much attention because it is inexpensive, stable under various pH conditions, and it slowly and continuously supplies sufficient amount of phosphorous to form the mineral pyromorphite. Here we propose to assess the suitability of Apatite II as an in situ soil amendment for lead in soil at urban residential sites. Specifically for the use on lead contaminated soils in New Orleans, LA. Three different sites have been chosen for this study to prove the effectiveness of Apatite II in treating lead contaminated soils. Also, other types of amendments will be used as phosphate sources and a comparison will be made between each to show the effectiveness of Apatite II to the other phosphate agents. In our study, we propose to demonstrate that not only is Apatite II an effective intervention product, but is also an environmentally acceptable agent that does not excessively leach from the soil. It was anticipated that Apatite II would be a better phosphate amendment agent than other types of phosphate. The potential problems associated with rapidly releasing phosphate agents involve phosphorus entering groundwater and then passing into standing water bodies and causing eutrophication. The work here will determine the advantage of Apatite II over other forms of phosphate agents in terms of leaching into the soil solution. In addition to evaluating the efficacy of Apatite II, the "Treat Lock and Cover" (TLC) approach that has been promulgated by the Artist Mel Chin (http://www.fundred.org/about/operationpaydirt. php), that involves capping the amended soil with clean layer of soil, is also to be tested by evaluating the action of Apatite II at depth in the soil. The advantage of TLC is that a barrier is put in place (the clean capping soil) for the time period over which conversion of the soil Pb to a sparingly soluble form occurs. The principal idea of the study is to demonstrate that Apatite II can be presented as clean-up "method of choice" for lead contaminated soils in urban areas. By demonstrating this, we also propose to show that Apatite II can be used as a remediation agent on a large urban scale as there is a recognized need for city wide remediation of lead contaminated soils in cities like New Orleans, LA.
Urban Soil Lead Abatement Demonstration Project
Author: Bioaccessibility Based In-situ Remediation of Lead-contaminated Soils Using Local Materials
Author: Martina Laura Vázquez MirandaPublisher:
ISBN:
Category : In situ remediation
Languages : en
Pages : 107
Book Description
Lead (Pb) speciation in soil is key for bioavailability assessment and exposure risk to humans from Pb contaminated soils. Soil ingestion is the main exposure pathway in Pb contaminated soils and in vitro bioaccessibility assays (IVBA) can predict relative bioavailable (RBA) Pb in soil by mimicking the GI tract conditions without traditional expensive animal feeding studies. In situ soil remediation has been considered an effective ecological treatment option compared to ex-situ techniques. The use of amendments such as biosolids, biochar, compost and phosphorous (P) amendments have been effective to decrease RBA in soils and, in doing so, reducing human exposure to the contaminant. In this study, soil amendments including biosolids, compost, wood-ash, biochar, soluble phosphate (SP) and their combinations were applied to Pb contaminated soil. Soil samples were incubated for up to 6 months at constant temperature, moisture and humidity. Samples were taken at three time points 1 (t1), 4 (t2) and 6 (t3) months of incubation and analyzed for total metal content, bioaccessible Pb (%IVBA-Pb), bioaccessible arsenic (%IVBA-As), organic carbon content (Org C), pH, extractable P and other key properties to determine the best treatment to reduce bioavailability of lead while improving soil health. Phosphorous was the most effective amendment to reduce %IVBA-Pb. Whether as individual or combined amendments, SP and biosolids resulted in 25-50% reductions of %IVBA Pb. Organic C addition did not reduce %IVBA-Pb, indicating complexation was not relevant for chemical immobilization of Pb in the case of strongly acidic soils such as the ones used in this experiment. %IVBA-As was correlated with pH and not P addition nor Organic C addition. Biosolid addition produced, apart from an expected plant available P increase, a great increase in Mineralizable Nitrogen content in the soils. Considering the importance of Nitrogen as an essential nutrient in plant growth, these results indicate that this amendment would be suitable for decreasing %IVBA-Pb and overall exposure to Pb contaminated soils. This is due to ensuring plant cover in the soils and decreasing soil erosion and loss, with the subsequent Pb dust dispersion, decreasing possible ingestion rates of the soil.
In Situ Soil Remediation
Author: A.M. OttenPublisher: Springer Science & Business Media
ISBN: 9401155941
Category : Science
Languages : en
Pages : 128
Book Description
In situ remediation techniques have experienced a boom over the last few years, thereby producing a wide range of valuable experiences. Their results have demonstrated that in situ techniques are a mature alternative to conventional remediation techniques. Irrespective of future policy developments, it is impossible to imagine future remediation practice without the use of in situ techniques. The book presents an overview of recent developments in the field of in situ soil remediation. The book is unique in that it is not a compilation of unrelated case studies. A conceptual approach has been chosen; remediation models described in this book are illustrated from a practical point of view. The authors present the Dutch way of treating contaminated land; The Netherlands is renowned for being at the forefront of remediation techniques as a result of the country's progressiveness and experience in this area.
Remediation of Lead Contaminated Soil at Greenbury Point, Annapolis, Md
Author: Kathryn A. StewartPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
The remedial investigation is satisfied through compilation of information required to adequately characterize Greenbury Point. Information includes data on lead, applicable regulatory requirements, soils types, contamination, site maps, field investigations, utility drawings, history, archeology, and natural resources. The feasibility study is satisfied through examination of remedial options. Various treatment technologies are screened for effectiveness in reducing the lead contamination or risks associated with the lead contamination. These include in-situ technologies, such as containment, soil flushing, and electrokinetic treatment; ex-situ technologies, such as physical separation/ concentration, soil washing and pyrometallurgical separation; and technologies with both in- and ex-situ applications, such as cement based solidification/ stabilization, polymer microencapsulation solidification/ stabilization, and vitrification. Each of these technologies is described and compared to conditions at Greenbury Point.
Model Development and Simulation of in Situ Remediation in Lead-contaminated Soils
Author: Zhiao ShiEnvironmental Soil Remediation and Rehabilitation
Author: Eric D. van HullebuschPublisher: Springer Nature
ISBN: 3030403483
Category : Science
Languages : en
Pages : 438
Book Description
This book provides a comprehensive overview of innovative remediation techniques and strategies for soils contaminated by heavy metals or organic compounds (e.g. petroleum hydrocarbons, NAPLs and chlorinated organic compounds). It discusses various novel chemical remediation approaches (in-situ and ex-situ) used alone and in combination with physical and/or thermal treatment. Further, it addresses the recovery of NAPLs, reuse of leaching solutions, and in-situ chemical reduction and oxidation, and explores the chemical enhancement of physical NAPLs recovery from both practical and theoretical perspectives. Also presenting the state-of-the-art in waste-assisted bioremediation to improve soil quality and the remediation of petroleum hydrocarbons, the book is a valuable resource for students, researchers and R&D professionals in industry engaged in the treatment of contaminated soils.