Treatment of PAHs in waters using the GAC-FBR process
- EFX Systems, Inc., Lansing, MI (United States)
- Michigan Biotechnology Inst., Lansing, MI (United States)
- Remediation Technologies, Inc., Concord, MA (United States)
- Gas Research Inst., Chicago, IL (United States)
Pilot studies were conducted to determine the utility of the granular activated carbon fluidized-bed reactor (GAC-FBR) process to treat groundwater from manufactured gas plant (MGP) sites containing polycyclic aromatic hydrocarbons (PAHs) and a process effluent water from a deep subsurface dense, nonaqueous-phase liquid (DNAPL) removal process at an MGP site. Removal of naphthalene exceeded 99.9%, and overall PAH removals of 99+% were observed at organic loading rates (OLRs) exceeding 4-kg chemical oxygen demand (COD)/m{sup 3}-d and a hydraulic retention time (HRT) of about 6 min. Analysis of PAHs accumulated on GAC and oxygen consumption clearly demonstrated that removal of 2- to 4-ring PAHs was due primarily to biological oxidation and not to adsorption. Analysis of influent and effluent samples using Microtox{reg_sign} indicated removal of toxicity. Full-scale application of the GAC-FBR process has begun at a Superfund site in Pennsylvania. The GAC-FBR is being used to treat a 15-gal per min (gpm) process effluent flow from a subsurface DNAPL removal process. Initial results confirm the ability of the process to treat PAHs at high OLRs and short HRTs.
- OSTI ID:
- 479339
- Report Number(s):
- CONF-950483--; ISBN 1-57477-010-1
- Country of Publication:
- United States
- Language:
- English
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