Senior Project Manager, Remediation Technology
Langan Engineering & Environmnetal Services, Inc.
FLASH POSTER PRESENTER – Biological Treatment: Strength in Small Packages
Bioremediation Treatability Study for Nitrobenzene, Aniline, and Diphenylamine at a Former Manufacturing Facility, New Jersey
In support of a soil and sediment bioremediation land treatment project, the comprehensive treatability study investigated the land treatment of nitrobenzene (NB), aniline, and diphenylamine (DPA) in soil. The presence of lower permeability soils was evaluated and proved to be a significant challenge in the evaluation. The objectives of the treatability study were to evaluate the feasibility of the biological land treatment application, develop contingent remedial approaches to mitigate the technical obstacles posed for land treatment and to develop data to support the remedial design basis. A full scale pilot test was implemented to evaluate site specific conditions and confirm design and operational protocols. The full scale implementation is scheduled for March 2017.
The laboratory treatability study consisted of four tasks: (1) soil sampling; (2) bulking simulation; (3) pre-treatment; and (4) land treatment simulation. The pilot test consisted of four different test cells with varying contaminant constituents, soil texture (plastic clays, cohesive silts, sands) and bulking agents.
An improved understanding of the major contaminants was achieved through the treatability study. Mainly, that NB could not be degraded effectively through reactive chemical oxidation methods or at elevated levels of more than 2,500 milligrams per kilogram (mg/kg) through biodegradation. However, NB and aniline are readily dissipated through abiotic processes, and can be readily degraded under moderate concentrations of less than 1,500 mg/kg.Elevated aniline at more than 2,500 mg/kg may pose toxicity to microbes. DPA was confirmed to pose no toxicity at elevated levels, and can be readily degraded. DPA cannot be lost through abiotic processes under ambient temperatures, so DPA reduction would solely rely on biodegradation.
- Ray Lees, Langan Engineering and Environmental Services, Inc., Warrington, PA
- Kevin McKeever, Langan Engineering and Environmental Services, Inc., Warrington, PA
- Sathya Yalvigi, The Chemours Company, Wilmington, DE