Impact of organic carbon and nutrients mobilized during chemical oxidation on subsequent bioremediation of a diesel-contaminated soil

Impact of organic carbon and nutrients mobilized during chemical oxidation on subsequent bioremediation of a diesel-contaminated soil

Type	Journal Article
Author	Nora B. Sutton
Author	Tim Grotenhuis
URL	http://www.sciencedirect.com/science/article/pii/S0045653513015737
Volume	97
Pages	64-70
Publication	Chemosphere
Date	February 2014
Abstract	Remediation with in situ chemical oxidation (ISCO) impacts soil organic matter (SOM) and the microbial community. Deleterious effects on the latter are a major impediment to coupling ISCO with in situ bioremediation (ISB). Authors studied treatment of a diesel-contaminated soil with Fenton’s reagent and modified Fenton’s reagent coupled with a subsequent bioremediation phase of 187 d, both with and without nutrient amendment. In the absence of nutrient amendment, the highest microbial respiration rates were correlated with higher availability of nitrogen and phosphorus species mobilized by oxidation. Significant diesel degradation was only observed following nutrient amendment, implying that nutrients mobilized by chemical oxidation can increase microbial activity but are insufficient for bioremediation. Overall, results indicate that biodegradation of DOC, as an alternative substrate to diesel, and biological utilization of mobilized nutrients have implications for the success of coupled ISCO and ISB treatments.