|
|
First Annual Southeastern In Situ Soil & Groundwater Remediation Conference |
Redox
Tech, LLC has developed a proprietary formulation to promote anaerobic
biodegradation of halogenated solvents in groundwater. The product, Anaerobic
Biochem ABC̉1,
is a patented mixture of lactates, fatty acids, and a phosphate buffer. ABC̉
contains soluble lactic acid as well as slow- and long-term releasing
components. The phosphate buffer provides phosphates, which are a micronutrient
for bioremediation. In addition, the buffer helps to maintain the pH in a range
that is best suited for microbial growth. Using a GeoProbẻ
and proprietary injection equipment, Redox Tech is able to inject ABC̉
in most geologic environments, including low-permeability silt and clay. For low
permeability environments, Redox Tech utilizes hydraulic fracturing. Many common organic groundwater contaminants can be treated in situ
by enhanced anaerobic processes.
These types of contaminants include chlorinated solvents, some chlorinated
aromatics, nitroaromatics, inorganics (e.g. nitrate and perchlorate), and metals
(e.g. chromium). With anaerobic biodegradation, the target contaminants are
“reduced” with hydrogen, unlike chemical oxidation or aerobic processes
where oxygen is the working chemical. For optimal anaerobic degradation to
occur, more energetically favorable electron acceptors such as oxygen, nitrate,
manganese, ferric iron or sulfate must first be consumed. There also must be
sufficient carbon source or food for the bacteria to thrive. Carbon sources can
include co-contaminants such as petroleum hydrocarbons or natural organic
matter. If these carbon sources are not metabolically available or are not
sufficient, the anaerobic process can be enhanced by introducing a food source
into the subsurface. One of the most effective and environmentally benign food
sources are fatty acids, which are found in ABC̉.
However, care must be taken not to overstimulate the bacteria, because in some
instances, the desired bacteria may be overwhelmed by other bacteria (such as
methanogens). This is why ABC̉
has slow- and long-term release compounds. In addition, in some instances, the
bacteria that are necessary to obtain the desired results are not at the site.
Often review of the site specific data a priori can determine this. In some
instances, fairly simple microbiological tests may be recommended. Because
enhanced anaerobic degradation can be different for every site, Redox Tech
carefully reviews site-specific data before formulating a mixture. Redox
Tech provides the added value of working closely with the client in order to
help avoid costly and embarrassing failures. ABC̉
is buffered because anaerobic biodegradation results in the product of metabolic
acids, which can lower the pH and adversely affect the results. The pH buffer
also is provides a source of phosphate, which is known to be a micronutrient (aka
vitamin) for the bacteria. Perhaps
one of the biggest advantages of ABC̉
results from its viscosity at ambient conditions. ABC̉
has roughly the same viscosity as a mixture of sugar water. This means that
labor-intensive pre-heating is not necessary for injection. More importantly,
the radius of influence that can be obtained with conventional injection is much
larger for ABC̉
because it will not become noticeably thicker as it comes in contact with often
colder soil and groundwater. New! Through
a license agreement provided by Envirometals and Adventus, Redox Tech is now the
only licensed and approved company
able to add zero valent iron to our formulation of Anaerobic BioChem. Let Redox Tech help formulate an enhanced anaerobic program for your site today. For more information contact:
John
Haselow Redox
Tech, LLC 1006A
Morrisville Parkway Morrisvile,
NC 27560 Phone:
919-460-0330 FAX:
919-460-0211 haselow@redox-tech.com 1ABC̉ is protected by US Patent 6,001,252. Trademark pending Additional Info Site Profile Sheet for Cost Estimate
|
|