Particle-Scale Investigation of PAH Desorption Kinetics and Thermodynamics from Sediment

Ghosh, Upal; Talley, Jeffrey W.; Luthy, Richard G.

doi:10.1021/es0105820

Cited by 176 publications

(161 citation statements)

References 35 publications

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“…Rather, these results indicate bacterial access to the pool of sorbed atrazine. According to Gillette et al (22) and Ghosh et al (20,21), sorbed concentrations of contaminants in soils differ from particle to particle and differ laterally and radially in the same particle, suggesting that sorption phenomena are heterogeneous at subparticle dimensions. In their study, polycyclic aromatic hydrocarbons accumulated more in organic carbon rich regions and on the exterior of soil particles.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Bioavailability of Soil-Sorbed Atrazine

Park

Feng

et al. 2003

Appl Environ Microbiol

118

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Bioavailability of pesticides sorbed to soils is an important determinant of their environmental fate and impact. Mineralization of sorbed atrazine was studied in soil and clay slurries, and a desorption-biodegradation-mineralization (DBM) model was developed to quantitatively evaluate the bioavailability of sorbed atrazine. Three atrazine-degrading bacteria that utilized atrazine as a sole N source (Pseudomonas sp. strain ADP, Agrobacterium radiobacter strain J14a, and Ralstonia sp. strain M91-3) were used in the bioavailability assays. Assays involved establishing sorption equilibrium in sterile soil slurries, inoculating the system with organisms, and measuring the CO 2 production over time. Sorption and desorption isotherm analyses were performed to evaluate distribution coefficients and desorption parameters, which consisted of three desorption site fractions and desorption rate coefficients. Atrazine sorption isotherms were linear for mineral and organic soils but displayed some nonlinearity for K-saturated montmorillonite. The desorption profiles were well described by the three-site desorption model. In many instances, the mineralization of atrazine was accurately predicted by the DBM model, which accounts for the extents and rates of sorption/desorption processes and assumes biodegradation of liquid-phase, but not sorbed, atrazine. However, for the Houghton muck soil, which manifested the highest sorbed atrazine concentrations, enhanced mineralization rates, i.e., greater than those expected on the basis of aqueous-phase atrazine concentration, were observed. Even the assumption of instantaneous desorption could not account for the elevated rates. A plausible explanation for enhanced bioavailability is that bacteria access the localized regions where atrazine is sorbed and that the concentrations found support higher mineralization rates than predicted on the basis of aqueous-phase concentrations. Characteristics of high sorbed-phase concentration, chemotaxis, and attachment of cells to soil particles seem to contribute to the bioavailability of soil-sorbed atrazine.

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Section: Discussionmentioning

confidence: 99%

Assessment of Bioavailability of Soil-Sorbed Atrazine

Park

Feng

et al. 2003

Appl Environ Microbiol

118

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“…The attraction between contaminants and PAC particles is also a very well studied process by Jonker and Koelmans (2002), Zimmerman et al (2004Zimmerman et al ( , 2005, and Ghosh et al (2001), among others. The method has been proven to reduce the negative impacts of contaminants on benthic organisms by reducing the amount of contaminants they uptake.…”

Section: Contaminated Sediments Have Become a Widespread Issue The Umentioning

confidence: 99%

Development of a waterjet system for direct delivery of granular iron and activated carbon to remediate contaminated aqueous sediments

Risley¹,

Elmore

Burken

et al. 2011

Remediation Journal

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While the techniques and technologies associated with contaminated sediment remediation are relatively mature, there are several issues associated with these practices that make them unattractive. The inability of currently used mechanical mixing implements to place amendments in aqueous environments and their intrusive behavior toward benthic communities are just two examples of a necessity for an improved delivery method. Waterjets may be a viable option for placement of particulate remediation amendments, such as activated carbon and granular iron, at depth. A custom waterjet nozzle and injection system has been fabricated by the authors to examine this delivery concept. The developed injection system's performance was tested by characterizing the waterjet-delivered amendment (activated carbon and granular iron) distributions in a surrogate sediment. The delivered amendment distributions followed similar patterns for a range of injection times and a variety of amendments. The injection depths, however, were dependent upon the type of amendment being injected. These findings have led to a better understanding of what occurs during an amendment injection, which can be used for a more controlled placement of remediation amendments using this technique in the future. The laboratory results indicate that the subject waterjet system may have the potential for field-scale applications, especially for granular iron delivery, as the authors were able to place between 60 and 70 wt percent into a surrogate sediment bed along the path of injection. O

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“…Using the equation developed by Schwartz and Scow (1999) [µmax.X o /K s = k], the first-order KRs were then calculated as [dC/dt = -kC], where k is the first-order rate constant (Ghosh et al, 2001), while the negative sign indicates that the PAHs are consumed over time.…”

Section: Sample Collection and Analysismentioning

confidence: 99%

Managing bioremediation of a creosote‐contaminated superfund site by optimizing moisture and temperature in a biopile

Portier

Iqbal

Metosh-Dickey

et al. 2007

Remediation Journal

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Soil moisture content and temperature in a contaminated soil biopile equipped with immobilized microbe bioreactors (IMBRs) were optimized during ex situ bioremediation at a creosotecontaminated Superfund site. Efficiency of remediation during warm summer months without soil-temperature and moisture optimization was compared with that of cold winter months when corrective measures were applied. Significant reduction (35 percent) in total polycyclic aromatic hydrocarbons (PAHs) was observed, compared to 3.97 percent without corrective measures ( p <0.05). Kinetic rates (KRs) for total PAH removal were significantly enhanced from 3.93 to 50.95 mg/kg/day. KRs for removal of high molecular mass four-to-six-ring PAHs were also significantly enhanced from 70.29 mg/kg/day to 97.45 mg/kg/day ( p < 0.05). Bioremediation of two-and three- INTRODUCTIONImmobilized microbe bioreactors (IMBRs) have been shown to be a successful bioremediation technology for cleanup of contaminated Superfund sites (Portier, 1994;Portier et al., 1998). Details of this technology are available elsewhere (Portier et al., 1990). Briefly, an IMBR consists of vessels filled with porous, diatomaceous earth ceramic beads that provide a large surface area for microbial attachment. A preferred microbial consortia with identified capabilities for biodegradation/mineralization is permanently attached to this porous matrix so as to optimally seed contaminated soils from a permanent point source. The IMBR system optimizes conditions necessary for microbial growth and provides the necessary oxygen and nutrients for rapid mineralization of selected waste streams (Portier et al., 1998).A bioplug is a miniaturized adaptation of IMBR technology and is usually made of a slotted polyvinyl chloride (PVC) or high-density polyethylene (HDPE) pipe packed with the previously described inoculated beads (Exhibit 1). metabolic specificity toward the compounds of concern at the remediation location (Portier et al., 1990). Bioplugs are inserted directly into contaminated soil be it in the ground or in a reservoir of excavated material, thereby creating a biopile. Water, air, and nutrients are added to each plug via a network of tubes to ensure an active and mobile culture for degradation of selected compounds. This increases the presence of useful culture and reduces the required treatment time, often the limiting factor when choosing a technology for site remediation.Optimizing environmental factors responsible for affecting the progress of bioremediation activity has a crucial role in its success (Portier & Christianson, 1994;Riser-Roberts, 1998). This optimization may lead to shortened treatment times, smoother running of the system year-round, successful mineralization of the contaminants, and restoration of the site to a functional ecosystem. Temperature and soil moisture are strong environmental variables responsible for growth and activity of microbes. In this study, the effect of optimized temperature and soil moisture inside a biopile into which bioplugs were insert...

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Particle-Scale Investigation of PAH Desorption Kinetics and Thermodynamics from Sediment

Cited by 176 publications

References 35 publications

Assessment of Bioavailability of Soil-Sorbed Atrazine

Assessment of Bioavailability of Soil-Sorbed Atrazine

Development of a waterjet system for direct delivery of granular iron and activated carbon to remediate contaminated aqueous sediments

Managing bioremediation of a creosote‐contaminated superfund site by optimizing moisture and temperature in a biopile

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