Using a special microbial blend, Delta Environmental has been successfully bioremediating high concentrations of heavy oil in soil around pipelines and oil production equipment. At a typical site, Delta reduced the concentration of petroleum C34 to >C50 from 130,000 mg/Kg to less than 10,900 in 30 days. That is a removal rate of 3,970 mg/Kg/day. This approach not only benefits the environment and meets green cleanup standards, but saves money and equipment downtime for the facility.
Petrox bioremediation accelerates the removal of naphthalene and isomers of methylnaphthalene. These petroleum compounds are often slow to remediate due to their low volatility and strong affinity for absorption onto soil particles. The remediation rate of these compounds is slower than BTEX compounds. They often also rebound as the absorbed phase solubilizes following removal of the compound from ground water to reestablish phase equilibrium. Petrox bioremediation accelerates the remediation of these compounds by a combination of metabolizing the dissolved phase and a biosurfactant effect that strips the compound from soil to make it available for metabolism.
For example, Petrox achieved more than 90% removal of these compound in less than 9 months at a site of a former underground storage tank (UST) in Florida. After the UST and surrounding contaminated soil were removed, the residual BTEX compounds were treated by chemical oxidation. The chemical oxidation, however, did not remove the naphthalene and methylnaphthalene isomers. Petrox was applied to the ground water in and around the former UST cavity.
Nine months after the Petrox application the following reductions in concentrations were achieved. The concentrations are the average of four ground water sampling locations.
Naphthalene – 367 ug/L reduced to 18 ug/L, 95% removal.
1 Methylnaphthalene – 255 ug/L reduced to 33 ug/L, 87% removal.
2 Methylnaphthalene – 400 ug/L reduced to 30 ug/L, 93% removal.
The Petrox was injected into the ground through a continuous low-volume injection system. This application method did not impact the use of the property or require major construction. The application was also far less costly than alternatives.
The greatest benefit was the relatively rapid removal of difficult contaminants.
For a brief summary of the basics of petroleum bioremediation follow this link Basics of Petroleum Bioremediation
Aerobic cometabolism of TCE may be limited by the potential microbial toxicity of by products or by product metabolic repression. An independent comparison of induced cometabolism using soluble methane and CL-Out bioaugmentation showed that CL-Out bioaugmentation removed more TCE. The TCE removal rate by CL-Out when supplemented with an oxygen source was a steady rate that continued past apparent limits of induced cometabolism. The significant difference may be in that the population of beneficial microbes that can be added is much higher than the population level that may be achieved through biostimulation. For a brief summary of the study follow this link Overcoming TCE Metabolic Limits.
Petrox bioremediation is used to remove petroleum contamination from soil and water under many different conditions. From surface spills to deep soil and ground water contamination, Petrox has successfully removed the contamination and environmental risk. This summary of case studies demonstrates the applicability of Petrox bioremediation to the full range and life cycle of petroleum spills. Click here to view the document.