svoc Articles

  • Properties and Behavior of Halogenated SVOCs

    An important consideration when evaluating a remedy is whether the compound is halogenated or nonhalogenated. A halogenated compound is one onto which a halogen ion(e.g., fluorine, chlorine, bromine, or iodine) has been attached. The nature of the halogen bond and the halogen itself can significantly affect performance of a technology or require more extensive treatment than for nonhalogenated ...

  • Properties and Behavior of Nonhalogenated SVOCs

    Subsurface contamination by nonhalogenated SVOCs potentially exists in four phases: Gaseous phase: contaminants present as vapors in saturated zone. Solid phase: contaminants adsorbed or partitioned onto the soil or aquifer material in both saturated and unsaturated zones. Aqueous phase: contaminants dissolved into pore water according to their solubility in both saturated and ...

  • Common Treatment Train for Nonhalogenated SVOCs

    A treatment train is the combination of different treatment technologies. A system diagram of a common treatment train for nonhalogenated SVOCs is illustrated below. A thermally enhanced soil vapor extraction system is used to pull SVOC vapor from the contaminated soil. Electrodes are installed in the contamination zone to enhance the desorption of SVOCs from the contaminated soil. The ...

  • Common Treatment Technologies for Nonhalogenated SVOCs in Soil, Sediment, and Sludge

    Common treatment technologies for nonhalogenated SVOCs in soil, sediment, and sludge include biodegradation, incineration, and excavation with off-site disposal. All types of biodegradation, both in situ or ex situ, can be considered to remediate soils: in situ bioremediation, bioventing, composting, controlled solid phase, or landfarming. Slurry phase biological treatment is also applicable but ...

  • Common Treatment Technologies for Nonhalogenated SVOCs in Ground Water, Surface Water, and Leachate

    It may be necessary to know other subsurface information to remediate nonhalogenated semivolatile organics in water. Treatability studies may be required to determine the contaminant biodegradability for any biodegradation technologies. Treatability studies are also necessary to ensure that the contaminated ground water can be treated effectively at the design flow. A subsurface geologic ...

  • Common Treatment Technologies for Halogenated SVOCs in Ground Water, Surface Water, and Leachate

    It may be necessary to know other subsurface information to remediate halogenated semivolatile organics in water. Treatability studies may be required to determine the contaminant biodegradability for any biodegradation technologies. Treatability studies are also necessary to ensure that the contaminated ground water can be treated effectively at the design flow. A subsurface geologic ...

  • Common Treatment Technologies for Halogenated SVOCs in Soil, Sediment, and Sludge

    Common treatment technologies for halogenated SVOCs in soil, sediment, and sludge include biodegradation, dehalogenation, incineration, and excavation with off-site disposal. All types of biodegradation, both in situ or ex situ, can be considered to remediate soils: in situ bioremediation, bioventing, composting, controlled solid phase, or landfarming. Slurry phase biological treatment is also ...

  • Detection of semi-volatile organic compounds (SVOCs) in surface water, soil, and groundwater in a chemical industrial park in Eastern China

    China is suffering from serious water and soil pollution, especially in the North China Plain. This work investigated semi-volatile organic compounds (SVOCs) in surface water, groundwater and soil within a chemical industrial park in Eastern China, for which the volatile organic compound (VOC) results have been previously reported. A total of 20 samples were collected from the field, and ...


    By IWA Publishing

  • Fast analysis of semi-volatile organic compounds using PTV-GC–TOF MS

    The evaluation of semi-volatile organic compounds (SVOCs) in environmental matrices poses many challenges for the analyst, not least the vast number that may be encountered in any given analysis. In addition, analyte reactivity and the potential for multiple analytes to co-elute makes achieving the required method detection limits (LODs or MDLs) quickly and cost-effectively a formidable task ...


    By SepSolve Analytical

  • Methods to assess carbonaceous aerosol sampling artifacts for IMPROVE and other long-term networks

    Volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs) adsorb to quartz fiber filters during fine and coarse particulate matter (PM2.5 and PM10, respectively) sampling for thermal/optical carbon analysis that measures organic carbon (OC) and elemental carbon (EC). Particulate SVOCs can evaporate after collection, with a small portion adsorbed within the filter. Adsorbed ...

  • Contamination levels and potential sources of organic pollution in an Asian river

    The Houjing River has long been an environmental victim of economic development. Industries that have settled along the bank of this river may have largely contributed to severe organic wastes pollution. This study collected water and sediment samples at various points along the river and measured concentrations of 61 volatile organic compounds (VOCs) and 128 semi-volatile organic compounds ...


    By IWA Publishing

  • Using Deconvolution Software to Identify Unknown Compounds

    Many software packages for the qualitative and quantitative analysis of GC/MS data allow the operator to indicate the target compounds of interest and generate a report that includes the observed concentration of each target compound in the sample. Given the targeted nature of the analysis, additional (i.e. unexpected) compounds present in the sample are not identified, unless the operator ...


  • IEST updates recommended practices to reflect leading-edge methods

    New developments covered in Recommended Practices revised recently by the Contamination Control Division of IEST include a test method for characterizing outgassed organic compounds; design and testing of Type IV (vee-bed) modular gas-phase adsorber cells; an automated surface cleaning efficiency test procedure; and production testing of filter types H through K. Characterizing Outgassed Organic ...

  • Slurry Phase Biological Treatment

    Slurry phase biological treatment involves the controlled treatment of excavated soil in a bioreactor. The excavated soil is first processed to physically separate stones and rubble. The soil is then mixed with water to a predetermined concentration dependent upon the concentration of the contaminants, the rate of biodegradation, and the physical nature of the soils. Some processes pre-wash the ...

  • In-well Vapor Stripping - Technology Overview

    In-well vapor stripping technology involves the creation of a ground-water circulation pattern and simultaneous aeration within the stripping well to volatilize VOCs from the circulating ground-water. Air-lift pumping is used to lift ground-water and strip it of contaminants. Contaminated vapors may be drawn off for aboveground treatment or released to the vadose zone for biodegradation. ...


  • Solar Detoxification

    Introduction: In this process, vacuum extraction is used to remove contaminants from soils. After condensation, contaminants are mixed with a semiconductor catalyst such (e.g., titanium dioxide), and fed through a reactor which is illuminated by sunlight. Ultraviolet light activates the catalyst, which results in the formation of reactive chemicals known as 'radicals'. These radicals are ...

  • Assessment of the PAHs contamination threat on groundwater: a case study of the Niger Delta region of Nigeria

    Contamination of the environment by polynuclear aromatic hydrocarbon (PAHs) is becoming a rising environmental concern. The interest this subject attracts has continually increased by the day because of the threat these compounds pose to human health. Water samples from several hand-dug wells in the Niger Delta region of Nigeria where extensive crude oil production activities take place were ...


    By Inderscience Publishers

  • PlumeStop Colloidal Biomatrix White Paper

    Securing rapid contaminant reduction and accelerated bioremediation using a dispersive injectable reagent Executive Summary PlumeStop Colloidal Biomatrix (PlumeStop) represents a new (patent pending) technology innovation designed to address the challenges of excessive time and end‐point uncertainty in groundwater bioremediation. The technology secures rapid ...


    By REGENESIS

  • Soil Washing

    Introduction: Soil washing is a water-based process for scrubbing soils ex situ to remove contaminants. The process removes contaminants from soils in one of two ways: By dissolving or suspending them in the wash solution (which can be sustained by chemical manipulation of pH for a period of time). By concentrating them into a smaller volume of soil through particle size ...

  • Properties and Behavior of Fuels

    Fuel contaminants are generally nonhalogenated. Information presented for nonhalogenated VOCs and nonhalogenated SVOCs may also be appropriate for many of the fuel contaminants presented in this subsection. Contamination by fuel contaminants in the unsaturated zone exists in four phases: vapor in the pore spaces; sorbed to subsurface solids; dissolved in water; or as NAPL. The nature and extent ...

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you