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ON-SITE ENGINEERING REPORT OF THE SLURRY-PHASE BIOLOGICAL REACTOR FOR PILOT-SCALE TESTING ON CONTAMINATED SOIL
Citation:
Dosani, M, J. Hessling, M. L. Smith, A. Jones, AND W. R. Mahaffey. ON-SITE ENGINEERING REPORT OF THE SLURRY-PHASE BIOLOGICAL REACTOR FOR PILOT-SCALE TESTING ON CONTAMINATED SOIL. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-93/066 (NTIS 93-178259), 1993.
Impact/Purpose:
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Description:
The performance of pilot-scale bioslurry treatment on creosote-contaminated soil was evaluated. Five reactors containing 66 L of slurry (30% soil by weight), were operated in parallel. The soil was a sandy soil with minor gravel content. The pilot-scale phase utilized an inoculum of indigenous polynuclear aromatic hydrocarbon (PAH) degraders (9.3 x 10 7 per g of soil), an inorganic nitrogen supplement in the form of ammonia nitrogen, and a media broth containing potassium, phosphate, magnesium, calcium, and iron to achieve an overall reduction of the PAH contaminants. The test reactors were operated over a period of 12 wk. uring the testing of the soil, levels of soil-bound and liquid-phase PAHS, total petroleum hydrocarbons (TPHs), nutrients, pH, dissolved oxygen, temperature, toxicity, and microbial activity were monitored. The results of analysis performed on posttreated soil samples revealed that the total percent reduction of soil bound PAHS, after 12 wk, ranged from >66.8% to >92.6%. Concentrations of PAHs in the liquid samples after 12 wk were very low.