A Novel Application of Enricher Reactor - Permeable Reactive Biobarrier for Removing a Mixture of Contaminants with Substrate Interactions
Enricher reactor (ER) - permeable reactive biobarrier (PRBB) was developed to address performance loss of a PRBB due to substrate interactions among a mixture of benzene, toluene, ethylbenzene, and xylene (BTEX) in groundwater, when the mixture reappeared after a 10-day absence period. Effect of ethanol, a common additive to gasoline, during the BTEX absence period on the substrate interactions among BTEX was investigated. Toluene and BTEX as an inducer in ER were compared to investigate toluene as a potential single inducer in ER. Augmentation of degraders from ERs greatly reduced the influence of substrate interactions and recovered the removal performances of PRBBs in relatively short time periods. PRBBs that did not receive ER supply experienced the most performance losses ranging from 11% to 35% for PRBBs initially inoculated with toluene degraders and 22% to 33% for PRBBs initially inoculated with BTEX degraders. Bacterial community of degraders enriched on toluene greatly differed from that of degraders enriched on BTEX. However, PRBBs augmented with degraders enriched on toluene not only overcame the inhibition interaction between benzene and toluene but also showed superior removal performances for toluene, which indicated that toluene can be used as a single inducer in an ER.
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Document Type: Research Article
Publication date: 2012-01-01
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