Biological Treatment of Soils Containing Manufactured Gas Plant Residues. Topical Report June 1988-February 1990

摘要

The report summarizes the results of an on-going laboratory research program directed by GRI to investigate the feasibility of using biological treatment to remediate soils containing residues from manufactured gas plant (MGP) sites, and to develop and verify a rapid assessment protocol (the GRI Accelerated Treatability Protocol) for determining the potential for biologically treating specific MGP site soils. This protocol, which features soil characterization, desorption testing and slurry reactor testing, is cost competitive with traditional treatability studies and can be completed in approximately half the time. For the first two soils evaluated, total polynuclear aromatic hydrocarbon (PAH) concentrations (a critical class of chemicals at MGP sites) were reduced by 95 and 80 percent to residual 'plateau' concentrations of less than 10 and 5,000 mg/Kg, respectively. It is believed that the magnitude of the 'plateau' concentration is not primarily dictated by the availability of nutrients, oxygen and adequate microbial populations but rather by limitations of mass transfer from the soil-waste matrix to the bulk aqueous phase. Further tests with thirteen other MGP soils are in-progress and the results of these will be reported at a later time.