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T.O.C.S.
- Hydrogen Sulfide Remission System
The Need
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In Sanitary wastewater
collection, conveyance, and treatment system, the existence of hydrogen sulfide (H2S)
can develop serious problems. These include corrosion, toxicity, and noxious odors. In
normal course, corrosion control, corrosion repair, and odor control can cost
billions of dollars per year. Hydrogen sulfide can be treated in vapor phase or in the
liquid phase using several methods, such as addition of caustic, hydrogen peroxide,
chlorine, ferrous sulfate and ferric chloride, or nitrate. Yet the capital investment for
such methods are estimated to be more than $50,000 per treatment site. |
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The Technology
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BioEnviroTech, Inc., (BET)
developed Toxicity Odor Corrosion Sulfides (T.O.C.S.) Remission System for hydrogen
sulfide reduction in municipal and industrial wastewater sewer, lift stations and force
mains. This safe and cost effective biotreatment technology uses safe and natural bacteria
to interrupt sulfide generation. The
interruption of sulfide generation can be done by the addition of natural and safe
facultative bacteria into the wastestream. Therefore, the biomass in the wastestream can
be dominated while interrupting the metabolism of the indigenous sulfur-reducing bacteria
living in the slime layer below the sewer flow line. The interdiction of sulfur-reducing
bacterial metabolism terminates or greatly reduces the anaerobic bacterial generation of
hydrogen sulfide.
Three to four pounds of facultative
bacterial compound is required to terminate approximately 85% of hydrogen sulfide
generation in one million gallons of sanitary wastewater. The calculation of the required
dosage is necessary to determine required selected bacteria count for the
domination of biomass. Cost of treatment does not increase with the potential for
increased generation of hydrogen sulfide since no stoichiometric chemical is required.
Capital cost are not required; the system includes equipment, maintenance, service and
monitoring of hydrogen sulfide levels.
The bacteria used in the inoculant are not
pathogenic, mutagenic, teratogenic, carcinogenic, toxic, or corrosive. While solving
hydrogen sulfide problems, the bacteria did not create problems in the wastewater
collection system, in the wastewater treatment processes, in nature , or in the community.
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The Benefits
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- Cost effective remission of hydrogen
sulfide.
- Reduces corrosion, odors, and toxicity.
- Uses all natural cultured bacteria.
- Requires no upfront capital outlay for
program.
- Decreases costs for line maintenance.
- Works 50% better than most chemicals.
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Status
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BET has been researched and
tested this technology extensively. A research pilot project held in December 1995, at
Trinity River Authority of Texas, was a success with the reduction of more than 81%
hydrogen sulfide. Another successful project was held in a residential neighborhood in
Jefferson Parish, Louisiana, in mid November 1996. After eighty one days of biotreatment,
a level of 83% reduction of hydrogen sulfide was achieved. |
Barriers
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Since the technology deals
with bacterial additive, some considerations and assurance need to be addressed in
designing the remission program, such as the characteristic of the bacteria, to insure
safety in the environment and for human exposure. |
Points of Contact
- Tom Mercer, BioEnviroTech, Inc., Phone:
1-800-758.3253, Fax: (281) 351-5494, Email: bacteria@betusa.com.
References
- T.O.C.S. Remission System, BioEnviroTech,
1997
- T.O.C.S. Remission System, BioEnviroTech,
http://www.betusa.com/tocs.html
Disclaimer Statement
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Neither the Construction
Industry Institute nor Purdue University in any way endorses this
technology or represents
that the information presented can be relied upon without further investigation. |
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