MGP soil remediation in a slurry-phase system: A pilot-scale test

摘要

An overall protocol for remediating manufactured gas plant (MGP) soils generally includes bench-scale evaluation of the technology, pilot-scale demonstration, and full-scale implementation. This paper summarizes the results of the bench-scale and pilot-scale study for treating an MGP soil with IGT`s integrated Chemical/Biological Treatment (CBT) or Manufactured Gas Plant Remediation (MGP-REM) process in the slurry-phase mode of application. MGP soils are contaminated primarily with polynuclear aromatic hydrocarbons (PAHs). An MGP site in New Jersey was the subject of this study. Soils from the site were used for the bench-scale evaluation of the integrated Chemical/Biological Treatment. The bench-scale study started with biological pre-treatment followed by chemical treatment and biological polishing. Results of the bench-scale study showed that this process was effective in degrading EPA Total as well as EPA Carcinogenic PAHs. A test matrix was developed to assess this technology at a pilot-scale facility. The test matrix consisted of at least eight semi-continuous runs designed to evaluate the effects of PAH concentration, total solids concentration, residence time, and a number of chemical reagent additions. An operating permit for 14 days was obtained to evaluate the process primarily for air emission data and secondarily for PAH degradation data. The PAH data showed that the MGP-REM process was very effective in degrading carcinogenic PAHs even under sub-optimal operating conditions. The field data also showed that the emissions of volatile organic compounds were well below the regulatory limits.