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Benefits of Renting vs. Owning Air Pollution Control Equipment
We have a ready to use air pollution control fleet or can design a specialized system for your plant operations. Some of the available systems include:
Granulated Activated Carbon (GAC) Systems, Biological Oxidation Systems, Wet Scrubbers, Regenerative, Catalytic and Direct Fired Thermal Oxidizers.
Rentals range from 6 months to 5 years with flexible options.
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|Understanding Soil Vapor Extraction
the soil by separating them into vapors and liquids, or may also be treated entirely as waste-gas and
treated directly. Soil vapor extraction is suitable for removing a variety of soil contaminants that have
elevated vapor hydrocarbons. Soil vapor extraction can operate with higher concentrations. The
methods in which contaminants are typically removed is either by air or steam. Air or steam may be
directly injected into the ground. When the process uses injecting air into the ground by a means of high
pressure blowers and injection wells is called sparging.
Another method to treat soil contaminates is to increase the soil temperature high enough to change
the liquid into a vapor, when this occurs there is an increase in soil pressure. Increasing the soil
temperature can appreciably minimize the time needed to achieve objective levels of remediation.
Modest soil heating can be achieved using an underground heat exchange system. Heating to
higher temperatures can be achieved with electrical resistance heating. The process includes
installing electrodes in the earth area of treatment and applying higher phase electricity to the
Electrical current flowing through the soil will generate heat through resistant heating; this causes
the soil contaminants to turn into a vapor. The vaporized soil contaminants will then be transported
through the soil vapor extraction collection system to the surface, where the containments may be
Extracted soil vapor can then be cooled if necessary to convert some of the vapor into a liquid. The
liquid VOC's and HAPS may be treated by alternate means, while treating the vapor phase by thermal
oxidation. When designing the treatment system one should take into account the expected
concentration of contaminants in both the liquid and vapor phases.
For the liquid phase, a more common treatment is to send the contaminants through a granulated
activated carbon system, after VOC's removal the H2O may be sent to the sewer for discharge. For the
vapor contaminant phase, the following methods may be used:
(A) Granulated Activated Carbon Biological Oxidation uses the granulated carbon bed to contain the
contaminate or trap the emissions and secondary microbes as the biological method to convert the
volatile organic compounds (VOCs) into H2O and CO2. These systems have a very high destruction
rate efficiency of 99%+.
(B) Treatment by oxidation using a thermal oxidizer (without use of a heat recovery bed), after
oxidation of the highly concentrated vapors a ceramic media heat recovery bed may be inserted into
the thermal oxidizer to capture the still high but lower volatile energy, as treatment continues one
may convert the thermal oxidizer into a catalytic oxidizer by means of placing catalyst on top of the
current ceramic media for final disposition or oxidation during the lowest level of vapor phase
destruction. Make sure you purchase technology capable of conversion during the various phases.
Various thermal oxidation equipment, granulated carbon adsorption and biological oxidation systems
are the three most common technologies used for Soil Vapor Extraction off-gas treatment. These
technologies are robust and are mature vapor treatment methods that address a wide variety of
contaminants and concentrations. The selection of off-gas treatment technologies for Soil Vapor
Extraction is based on cost and operational considerations that differentiate thermal oxidation,
catalytic oxidation, carbon adsorption and biological oxidation systems.