Adventus Americas Inc.

SITE Technology Capsule - DARAMEND Bioremediation Technology


Courtesy of Adventus Americas Inc.

GRACE Bioremediation Technologies’ DARAMENDTM Bioremediation Technology is an amendment-enhanced
bioremediation technology for soils and sediments contaminated with a wide variety of organic contaminants including
chlorinated phenols, polynuclear aromatic hydrocarbons (PAHs) and petroleum hydrocarbons. The technology may be applied ex situ to sediment and soil and in situ to near-surface soils. The technology is based upon the addition of solid-phase organic amendments of specific particle-size distribution and nutrient content. The amendments increase the ability of the soil matrix to supply biologically available water and nutrients to microorganisms that are capable of degrading the target compounds. In addition, the amendments bind pollutants to reduce the acute toxicity of the soil’s aqueous phase, thereby allowing microorganisms to survive in soils containing very high concentrations of toxicants.
The DARAMENDTM Bioremediation Technology was evaluated under the SITE program at the Domtar Wood Preserving Facility in Trenton, ON, Canada. The facility formerly treated wooden poles with solutions of creosote and pentachlorophenol (PCP). Soil at the site is contaminated with chlorinated phenols and PAHs at concentrations of up to 700 mg/kg and 3,000 mg/kg, respectively. Results from the SITE Demonstration indicate that the DARAMENDTM Bioremediation Technology significantly reduced total chlorinated phenols (TCPs), PAHs, and total recoverable petroleum hydrocarbons (TRPH) in the contaminated soils. Toxicity tests, using earthworm mortality and seed germination inhibition, indicated that the bioremediation process reduced the toxicity of the soils to these organisms. Water balance was successfully maintained to avoid the generation of contaminant-laden leachate. The DARAMENDTM Bioremediation Technology was implemented without any difficulties and it generally operated well throughout the demonstration period. The DARAMENDTM Bioremediation Technology was evaluated based on seven criteria used for decision making in the Superfund feasibility study (FS) process. Results of the evaluation are summarized in Table 1.

In 1980, the U.S. Congress passed the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), also known as Superfund, which was committed to protecting human health and the environment from uncontrolled hazardous waste sites. CERCLA was amended by the Super-fund Amendments and Reauthorization Act (SARA) in 1986, which calls for long-term effectiveness and permanence of remedies at Superfund sites. SARA mandates implementing permanent solutions and using alternative treatment technologies or resource recovery technologies, to the maximum extent possible, to clean up hazardous waste sites. State and federal agencies, as well as private parties, are now exploring a growing number of innovative technologies for treating hazardous wastes. The sites on the National Priorities List total over 1,700 and represent a broad spectrum of physical, chemical, and environmental conditions requiring various types of remediation. The U.S. Environmental Protection Agency (EPA) has focused on policy, technical, and informational issues in exploring and applying new remediation technologies to Superfund sites.

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