Title

Periodic Aerated Treatment And In-Situ Bioremediation Strategies For Polyhalogenated Compounds

Keywords

Alternating anaerobic-aerobic in-situ bioremediation strategy; DNAPLs; Highly halogenated compounds; PAABR; Periodic aerated anaerobic batch reactor

Abstract

Polyhalogenated compounds are known to resist aerobic degradation but are subject to anaerobic reductive dehalogenation. The anaerobic biotransformation often result in the accumulation of toxic and carcinogenic compounds. An example is the production of trichloroethylene (TCE), cis-1,2-dichloroethylene (cDCE), trans-1,2-dichloroethylene (tDCE), 1,1-dichloroethylene (1,1-DCE) and vinyl chloride (VC), from anaerobic dechlorination of tetrachloroethylene (PCE). However, the anaerobic dehalogenation products are known to be susceptible to aerobic methanotrophic oxidative mineralization. Therefore, the treatment of polyhalogenated compounds and field remediation of sites contaminated by these compounds involve anaerobic biotransformation followed by aerobic mineralization. As opposed to two stage treatment and remediation which involve anaerobic environment followed by an aerobic environment in two separate systems or environments, recent focus on the detoxification of polyhalogenated compounds involve the development of engineering systems which can accomplish anaerobic biotransformation and aerobic oxidative mineralization in a single reaction environment. Periodic aerated anaerobic batch systems, including systems for ex-situ and in-situ biodetoxification of polyhalogenated compounds are being developed at San Jose State University under the direction of Dr Udeme J. Ndon. These systems and results of preliminary studies are presented in this report. Results of the preliminary experiments showed minimum accumulation of PCE biotransformation products in comparison to strict anaerobic conditions. Results also show that PCE degradation may have occurred during the transition between anaerobiosis and aerobiosis.

Publication Date

1-1-1999

Publication Title

Water Research

Volume

33

Issue

11

Number of Pages

2715-2720

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/S0043-1354(98)00499-0

Socpus ID

0033066905 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0033066905

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