Bioremediation of soils contaminated with bis-(2-ethylhexyl) phthalate (BEHP)in a soil slurry-sequencing batch reactor
✍ Scribed by Irvine, R. L. ;Earley, J. P. ;Kehrberger, George J. ;Tod Delaney, B.
- Publisher
- American Institute of Chemical Engineers
- Year
- 1993
- Tongue
- English
- Weight
- 703 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0278-4491
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✦ Synopsis
A bench-scde study was conducted to assess the feasibility of bioremediating phthalate contaminated soil from a polyvinyl chloride manufacturing operation in New Jersey. 14 bench-scale slurry reactor study which utilized I4C-labeled bis-(2ethylhexyl) phthalate (BEHP) demonstrated that approximately 50 to 60% of the carbon in BEHP was mineralized directly to COz by indigenous microbial flora, while the remaining 40 to 50% was converted into cell mass. Additional bench-scale studies were conducted in Soil Slurry-Sequencing Batch Reactors ( 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) . Treatment efficiencies of greater than 96% for both BEHP and TPH were observed in slurry reactors supplemented with nutrients (e.g., 1.4 to 2.0 g N per kg dry soil and 0.16 to 13.4 g P per k g dry soil). BEHP concentrations were reduced from initial leuels 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.