Regenerative Thermal Oxidizer

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Up to 12000 SCFM Regenerative Thermal Oxidizer RTO VOC    US $250,000.00

Tellkamp Regenerative 40000 CFM Thermal Oxidizer System Model 25    US $100,000.00

2500 SCFM Regenerative Thermal Oxidizer RTO Reduce VOC    US $85,000.00

Advantage Energy Group Regenerative Thermal Oxidizer RTO 3500 CFM Very Nice    US $32,500.00

Soil Vapor Extraction Using Combination GAC And Thermal Oxidation

Remediation by means of Soil Vapor Extraction (SVE) is a process that occurs in its natural occurring place and the soil contamination is removed by either steam or air. The gathered soil vapors may then be divided into vapors and liquids, or treated entirely as waste gas and treated directly. Soil vapor extraction is suitable for removing a variety of soil contaminants that have an elevated vapor pressure and/or lower boiling points when compared to H2O, an example would be chlorinated hydrocarbons.

Soil vapor extraction can cope with higher concentrations of contaminant, which include contaminants in the form of a non-aqueous phase liquid. Soil vapor extraction can be differentiated as a rapid and efficient remediation method. The methods typically used are either air or steam for contaminants located in the soil. Stream or Air may be precisely injected into the soil. When the procedure uses air injected into the soil by means of high pressure blowers and injection wells it is called air 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 electrodes. 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 collected.

Removed ground vapor can then be cooled if necessary for conversion into a liquid. The liquid material; then separated can be treated by alternate means, while treating the vapor 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 run the contaminants through a granulated activated carbon system, and then to send the cleaned H2O to the sewer or discharge it to a local pond area. For the vapor contaminant phase, the following methods may be used:

(A)  Run the vapor through a granulated activated carbon system which is separate from the primary treatment of the liquid.

(B)  Treatment by oxidation using a regenerative 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 regenerative thermal oxidizer to capture the lower volatile energy as heat and reduce oxidation abatement costs during the lower level vapor  destruction phase.

(C) Condensing the vapors into non-aqueous phase liquid form for reuse or recycling. Generally, granulated activated carbon is used primary for low volatile organic compounds vapor concentrations less than 500 ppmv, thermal oxidation is used for vapor concentrations between 500 and 5,000 ppmv. On higher than 5,000 ppmv dilution air may be required. At 2,500 to 5,000 ppmv the regenerative thermal oxidizer system will be able to operate at low to no fuel costs, this due to the higher levels of volatile organic compounds supplying the BTU value.

Thermal oxidation and carbon adsorption are the two most common technologies used for Soil Vapor Extraction off-gas treatment. These technologies are fast and dependable methods of vapor treatment 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 and carbon adsorption systems. Even though many factors may effect the economics of waste-gas treatment, the general rule for selecting thermal oxidation or carbon adsorption is that dilute off gases are more cost effectively treated by carbon adsorption. Thermal oxidation is more cost effective for soil vapor that contains larger concentrated values of vapor waste. Some sites have both thermal oxidation and Granular Activated Carbon systems. Thermal oxidation systems have been used to treat higher initial concentrations and are replaced by GAC systems once concentrations have decreased.

For more information about Soil Vapor Extraction please visit: American Environmental Fabrication & Supply

Regenerative Thermal Oxidizer Operation