Showing papers by "Pedro J. J. Alvarez published in 1998"
TL;DR: In this article, it was shown that Fe(0) can stoichio metrically reduce nitrate to ammonium and that cathodic hydrogen [produced during anaerobic Fe( 0) corrosion by water] can sustain microbial den...
Abstract: Proof of concept was obtained that Fe(0) can stoichio metrically reduce nitrate to ammonium and that cathodic hydrogen [produced during anaerobic Fe(0) corrosion by water] can sustain microbial den...
301 citations
TL;DR: In this article, the effect of ethanol on microbial degradation of representative BTX compounds under electron acceptor conditions commonly found in intrinsic bioremediation projects was investigated. But, little is known about ethanol's effect on biOREmediation of the toxic BTX contaminants.
179 citations
Patent•
24 Apr 1998TL;DR: In this paper, methods, devices and apparatus for bioremediation of mixed waste aquifers, based on a synergistic combination of reductive treatment using zero-valent iron and anaerobic biotransformations, are presented.
Abstract: Disclosed are methods, devices and apparatus for bioremediation of mixed waste aquifers, based on a synergistic combination of reductive treatment using zero-valent iron and anaerobic biotransformations Also disclosed are methods for in situ and ex situ remediation of groundwater and wastewater via these iron-bacterial compositions in a variety of devices including batch reactors, permeable and semipermeable reactive barriers, flow-through reactors, fluidized bed reactors, and sediment tanks
82 citations
TL;DR: The feasibility of injecting benzoate to enhance the growth of BTX degraders and establish a buffer zone downgradient of a BTX plume was also investigated in this article.
Abstract: Flow-through aquifer columns were used to evaluate the efficacy of using benzoate as a biostimulatory substrate to enhance the aerobic biodegradation of benzene, toluene, and o-xylene (BTX), fed continuously at low concentra tions (about 0.2 mg/L each). When used as a cosubstrate, benzoate addition (1 mg/L) enhanced BTX degradation kinetics and attenuated BTX breakthrough relative to acetate-amended (2 mg/L) or unamended control columns. The benzoate-amended column also experienced an increase in predominance of pseudomonad species capable of degrading BTX. The feasibility of injecting benzoate to enhance the growth of BTX degraders and establish a buffer zone downgradient of a BTX plume was also investigated. Using pristine aquifer material without previous exposure to BTX, aquifer columns were fed benzoate (2 mg/L), acetate (4 mg/L), or mineral medium without supplemental substrates during a 2-day acclimation stage. All columns were subsequently fed BTX alone, and their breakthrough was monitored. Previ...
25 citations
TL;DR: In this paper, traces of MTBE in ground water (>10 ppb) do not necessarily indicate recent gasoline contamination, and therefore, they do not indicate the presence of gasoline contamination.
Abstract: “Traces of MTBE in ground water (>10 ppb) do not necessarily indicate recent gasoline contamination.”
13 citations
Journal Article•
6 citations