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| Environmental Technology Listing |
Title of Listing: | | Biocat-II (TM) |
Category: | | Treatment Technologies |
Subcategory: | * | Waste, Soil, All Listings |
Media: | | Soil, Mixed Waste |
Contaminants: | | Aromatic Hydrocarbons, Heavy Metals, Acids, Salts |
Web Site: | | http://www.yestech.com/ |
Email: | | yes@imt.net |
Technology Description: | |
BIOREMEDIATION - SLURRY PHASE
The BIOCAT-II (TM) Process for bioremediation of mixed hazardous wastes removes aromatic hydrocarbons, halogenated hydrocarbons, heavy metals, acids and salts from mixed waste streams. Control of the microorganisms mean cell residence time (kinetic control) and other parameters are used to enrich a series of cultures of microorganisms that are capable of accomplishing the required biotransformations. Initial denitrification and/or sulfate-reduction process steps are followed by a methanogenic step. In some instances a final aerobic treatment step is provided.
The process uses natural microorganisms to remove toxic organic and inorganic waste constituents with recovery of metals, sulfur and energy from mixed hazardous wastes. Applications include bioremediation of industrial wastewater, sludges, slurries and contaminated groundwater.
Sludges or slurries containing mixed hazardous waste are introduced first to an anoxic, preferably completely mixed reactor, in which denitrification is occurring. If the waste does not contain sufficient nitric acid, nitrate is also added to the reactor. If very low effluent concentrations of aromatic hydrocarbons are sought, it may be necessary to add a primary substrate, such as methanol to the reactor. Denitrification produces alkalinity which increases the water pH and causes metal precipitation. Nitrogen gas produced in the reactor is introduced to one of the downstream reactors. In some versions, the process begins with an anaerobic sulfate-reduction step. In others, a sulfate reduction step is provided after the denitrification step. During this stage, sulfate is added if the waste does not contain sufficient sulfuric acid. Waste pH is increased by removal of hydrogen sulfide gas, from which sulfur can be recovered. The increased pH also determines the reduction of heavy metal concentrations to very low levels. During a third process step, methanogenesis and most of the dehalogenation reactions occur. In some versions at least a portion of this step can occur in the pore space of an underground formation. If further treatment is required, a conventional aerobic treatment step is provided.
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Performance Status/
Limitations: | |
Limitations:
The BIOCAT-II (TM) Process is applicable to situations wherein the wastes can be exposed to a sequence of treatment environments. This is most easily accomplished in a series of reactors.
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Topics
Bioremediation/Biodegradation, Mixed/Radioactive Waste, Technologies, Treatment/Remediation
Additional Topics/Tags/Keywords
Bioremediation, Soil, Mixed Waste |
Organization: | | Yellowstone Environmental Science, Inc. |
Address: | | 920 Technology Boulevard
| Phone: | Description | Number |
City: | | Bozeman | | Primary | (406) 586-2002 |
State/Province/Territory: | | MT | 2. | | |
Zip/Postal Code: | | 59715 | 3. | | |
Country: | | United States | 4. | Fax: | (406) 586-8188 |
Branch Locations: | |
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