off-gas treatment Articles | Environmental XPRT

Sustainable soil remediation by refrigerated condensation at sites with `high-concentration` recalcitrant compounds and NAPL: two case studies

Remediation of recalcitrant compounds at sites with high concentrations of volatile organic com- pounds (VOCs) or nonaqueous-phase liquids (NAPLs) can present significant technical and financial (long-term) risk for stakeholders. Until recently, however, sustainability has not been included as a significant factor to be considered in the feasibility and risk evaluation for remediation ...

Oct. 13, 2010

By EnviroLogek Technologies

Air Emissions/Off-Gas Treatment

A number of technologies have been widely applied for removal of VOCs from off-gas streams. However, the application of these technologies to off-gases from site remediation may be quite limited. Biofiltration has been widely applied for VOC destruction in Europe and Japan, but it has only recently been used in the United States. Catalytic and thermal oxidation are widely used for the destruction ...

Jan. 1, 1997

By Federal Remediation Technologies Roundtable

Off-Gas Treatment Technologies for Soil Vapor Extraction Systems: State of the Practice

Untitled Document EXECUTIVE SUMMARY This document provides state-of-the-practice information on off-gas treatment technologies for soil vapor extraction (SVE) systems currently being used to clean up hazardous waste sites. It provides information on a wide variety of processes, including common practices as well as innovative emerging alternatives to illustrate the state ...

Jun. 1, 2006

By US EPA - Environmental Protection Agency

Using Air Strippers for Off-gas Treatment - Case Study

Two pharmaceutical plants in Puerto Rico used large sequencing batch reactor (SBR) systems to treat their wastewater. The primary treatment was an aerobic bio breakdown of the waste. The were forced to change their treament process because of change in treatment regulations. The new regulations required them to treat off-gas that was coming from the SBRs. They were faced with installing a very ...

Jan. 16, 2017

By QED Environmental Systems, Inc

U.S. Air Force DOD Project - Case Study

Environmental Issues Controlling the off-gas from a remediation project, where high concentrations of petroleum hydrocarbons are present, can be a difficult if not dangerous process when utilizing internal combustion engines and conventional oxidation technology. In more recent years, the use of high vacuum pumps to accomplish both liquid and gas phase extraction — sometimes referred to ...

Dec. 20, 2017

By Catalytic Combustion Corporation (CCC)

Data Requirements Air Emissions/Off-Gases

Predictive modeling may be usefelected to represent the system (e.g., SVE treatment, incinerator, etc.), and site and contaminant informaul in estimating emissions from a site or treatment system. An appropriate theoretical model is stion is used to estimate gross emissions. Because many variables affect emission rates, this approach is limited by the representativeness of the model and by the ...

Jan. 1, 1997

By Federal Remediation Technologies Roundtable

Thermal Desorption Unit - Overview, Types and Applications

Thermal desorption is basically a remediation technique heavily used to clean contaminated soils, sludge’s etc. This technique uses heat to vaporize the contaminants, and works only for volatile contaminants. These include typically organic wastes composed of hydrocarbons, such as coal tar wastes, chlorinated solvents, oil refining wastes, fuels, pesticides, and a lot other. In the ...

Feb. 25, 2014

By IWA Publishing

3-in-1 Flame-Ox High BTU Thermal Oxidizer - Case Study

Environmental Issues Controlling the off-gas from a remediation project, where high concentrations of petroleum hydrocarbons are present, can be a difficult if not dangerous process when utilizing internal combustion engines and conventional oxidation technology. In more recent years, the use of high vacuum pumps to accomplish both liquid and gas phase extraction — sometimes referred to as ...

Nov. 22, 2018

By Catalytic Combustion Corporation (CCC)

Case study - Coupling ISCO and anaerobic bioremediation at Kings Bay Naval Submarine Base wins state award of environmental excellence

Site Description: The Naval Submarine Base in Kings Bay, Georgia (a former landfill) was impacted with VOCs due to buried drums. Contaminants: PCE and its degradation products at concentrations of 9,000 ug/L. Based on investigation efforts conducted by the Navy, DNAPL was also suspected. Remedial Challenge: The groundwater plume was moving off site to a residential subdivision, which ...

Feb. 4, 2017

By Geo-Cleanse International, Inc. (Geo-Cleanse)

Treating drinking water with 99% removal - Case Study

QED E-Z Tray® Air Stripper Treating Drinking Water with 99% Removal in Cedarburg, Wisconsin In October 2011, the Cedarburg, Wisconsin Light and Water Utility installed a QED E-Z Tray® (U.S. Patent Number 5,518,668) Air Stripper in a discreet addition to their existing production pump building. The E-Z Tray 72.6 handles a flow rate of 600 gpm and treats groundwater containing vinyl ...

Jan. 16, 2017

By QED Environmental Systems, Inc

Soil Vapor Extraction (In Situ)

Introduction Soil vapor extraction (SVE) is an in situ unsaturated (vadose) zone soil remediation technology in which a vacuum is applied to the soil to induce the controlled flow of air and remove volatile and some semivolatile contaminants from the soil. The gas leaving the soil may be treated to recover or destroy the contaminants, depending on local and state air discharge regulations. ...

Jan. 1, 1997

By Federal Remediation Technologies Roundtable

Andover, Vapor Extraction and Refrigerated Condensation Case study

Vapor Extraction and Refrigerated Condensation was used as a primary source removal technology to remediate high concentrations of recalcitrant chlorinated solvent compounds at the WDE Site in Minnesota. The use of Refrigerated Condensation has achieved high mass removal rates and will reduce the lifecycle costs and time of remediation. History 6,600 drums of hazardous wastes were placed in a ...

May 13, 2014

By In-Situ Oxidative Technologies, Inc (ISOTEC) - Soil & Groundwater Remediation

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 ...

Jan. 1, 1997

By Federal Remediation Technologies Roundtable

Soil Vapor Extraction (Ex Situ)

Introduction: Ex situ soil vapor extraction (SVE) is a full-scale technology in which soil is excavated and placed over a network of aboveground piping to which a vacuum is applied to encourage volatilization of organics. Soil piles are generally covered with a geomembrane to prevent volatile emissions and to prevent the soil from becoming saturated by precipitation. The process includes a ...

Oct. 1, 1997

By Federal Remediation Technologies Roundtable

In Situ Thermal Treatment for Soil, Sediment, and Sludge

The main advantage of in situ thermal treatment is that it allows soil to be treated without being excavated and transported, resulting in significant cost savings. However, in situ treatment generally requires longer time periods, and there is less certainty about the uniformity of treatment because of the variability in soil and aquifer characteristics and because the efficacy of the process is ...

Jan. 1, 1997

By Federal Remediation Technologies Roundtable

Properties and Behavior of Radionuclides

For the purposes of this document, radionuclides should be considered to have properties similar to those of other heavy metals.This does not imply that all radionuclides are heavy metals, but that the majority of sites requiring remediation of radioactively contaminated materials are contaminated with radionuclides that have similar properties. Like metals, the contaminants of concern are ...

Jan. 1, 1997

By Federal Remediation Technologies Roundtable

Removing VOCs from Municipal Water Supply - Case Study

QED E-Z Tray® Air Strippers Removing Volatile Compounds in Cheyenne’s Drinking Water The U.S. Army Corps of Engineers (USACE) – Omaha District has funded the design and construction of a new groundwater treatment plant in Cheyenne, Wyoming to treat groundwater from the city’s Borie well field. This important groundwater supply was apparently contaminated with ...

Jan. 16, 2017

By QED Environmental Systems, Inc

Landfill remediation with refrigerants and chlorinated solvents

PROJECT DESCRIPTION Between 1979 and 1980, industrial and hazardous wastes were disposed of at the Site in a series of unlined pits, each of which was used for a particular type of waste disposal. It is reported based on evaluations of manifests that approximately 3.4 million gallons of hazardous liquid wastes and between 3,700 and 4,100 tons of solid wastes were disposed of in the pits at the ...

Oct. 13, 2010

By GEO Environmental Remediation Company

Efficient cleaning of effluent gases from optical fibre production processes using a V-tex scrubber

Introduction In this paper we discuss a unique process technology called the V-tex scrubber. Its design makes it particularly suitable for a wide range of scrubbing and stripping applications, where it can deliver economic and technical advantages for the operator versus conventional packed tower or tray scrubbers, venturi and fluidized bed scrubbers. In cases where there are both ...

May 1, 2008

By ERG (Air Pollution Control) Ltd

Oxygen-induced dynamics of nitrous oxide in water and off-gas during the treatment of digester supernatant

Nitrous oxide (N2O) is a potent greenhouse gas and of special concern in wastewater treatment. It is formed in biological wastewater treatment under both aerobic and anaerobic conditions. A major reason for high N2O emissions is low oxygen concentration during nitrification. In this full-scale study of N2O emissions from a sequencing batch reactor for treating digester supernatant, the oxygen ...

Jan. 16, 2014

By IWA Publishing