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SBR Technologies determines an effective process for the bioremediation of soils contaminated with Bis-(2-ethylhexyl) Phthalates (BEHP) and Petroleum Hydrocarbons

Challenge

SBR Technologies, Inc. (SBRT) was hired to conduct a six month bench scale study in order to assess the feasibility of bioremediating phthalate contaminated soil from a polyvinyl chloride manufacturing operation in northern New Jersey.

SBR Technologies Solution

SBRT began with a bench scale slurry reactor study which utilized 14C-labeled BEHP and demonstrated that approximately 50 to 60% of the carbon in BEHP was mineralized directly to CO2 by indigenous microbial flora. The remaining 40 to 50% of the carbon was converted into cell mass. Additional bench scale studies were conducted in the SS-SBR to evaluate the impact of basic biotreatability parameters (e.g., nutrient requirements and seed acclimation) on the bioremediation of soil contaminated with high levels of BEHP and total petroleum hydrocarbons (TPH).

Benefits Achieved

The studies resulted in treatment efficiencies of greater than 96% for both BEHP and TPH in slurry reactors supplemented with nutrients. BEHP concentrations were reduced from initial levels as high as 24,000 mg/ kg to less than 230 mg/kg and TPH concentrations, from 8,000 mg/kg to 160 mg/kg.