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Danny Reible is the Donovan Maddox Distinguished Engineering Chair and Paul Whitfield Horn Professor at Texas Tech University where he guides the development of the Maddox Environmental Engineering Research Center. He holds a PhD in Chemical Engineering from Caltech and in 2005 was elected to the National Academy of Engineering for “the development of widely used means of managing contaminated sediments”. His current research is focused on sustainable management of water resources, technologies and practices for the use and reuse of brackish and produced waters, and the assessment and remediation of contaminated soils and sediments
Climate change, population growth, and increased industrial activities are exacerbating freshwater scarcity and leading to increased interest in desalination of saline water. Brackish water is an attractive alternative to freshwater due to its low salinity and widespread availability in many water-scarce areas. However, partial or total desalination of brackish water is essential to reach the water quality requirements for a variety of applications. Selection of appropriate technology requires knowledge and understanding of the operational principles, capabilities, and limitations of the available desalination processes. Proper combination of feedwater technology improves the energy efficiency of desalination. In this article, we focus on pressure-driven and electro-driven membrane desalination processes. We review the principles, as well as challenges and recent improvements for reverse osmosis (RO), nanofiltration (NF), electrodialysis (ED), and membrane capacitive deionization (MCDI). RO is the dominant membrane process for large-scale desalination of brackish water with higher salinity, while ED and MCDI are energy-efficient for lower salinity ranges. Selective removal of multivalent components makes NF an excellent option for water softening. Brackish water desalination with membrane processes faces a series of challenges. Membrane fouling and scaling are the common issues associated with these processes, resulting in a reduction in their water recovery and energy efficiency. To overcome such adverse effects, many efforts have been dedicated toward development of pre-treatment steps, surface modification of membranes, use of anti-scalant, and modification of operational conditions. However, the effectiveness of these approaches depends on the fouling propensity of the feed water. In addition to the fouling and scaling, each process may face other challenges depending on their state of development and maturity. This review provides recent advances in the material, architecture, and operation of these processes that can assist in the selection and design of technologies for particular applications. The active research directions to improve the performance of these processes are also identified. The review shows that technologies that are tunable and particularly efficient for partial desalination such as ED and MCDI are increasingly competitive with traditional RO processes. Development of cost-effective ion exchange membranes with high chemical and mechanical stability can further improve the economy of desalination with electro-membrane processes and advance their future applications.
Soraya Honarparvar; Xin Zhang; Tianyu Chen; Ashkan Alborzi; Khurshida Afroz; Danny Reible. Frontiers of Membrane Desalination Processes for Brackish Water Treatment: A Review. Membranes 2021, 11, 246 .
AMA StyleSoraya Honarparvar, Xin Zhang, Tianyu Chen, Ashkan Alborzi, Khurshida Afroz, Danny Reible. Frontiers of Membrane Desalination Processes for Brackish Water Treatment: A Review. Membranes. 2021; 11 (4):246.
Chicago/Turabian StyleSoraya Honarparvar; Xin Zhang; Tianyu Chen; Ashkan Alborzi; Khurshida Afroz; Danny Reible. 2021. "Frontiers of Membrane Desalination Processes for Brackish Water Treatment: A Review." Membranes 11, no. 4: 246.
Water softening is desirable to reduce scaling in water infrastructure and to meet industrial water quality needs and consumer preferences. Membrane capacitive deionization (MCDI) can preferentially adsorb divalent ions including calcium and magnesium and thus may be an attractive water softening technology. In this work, a process model incorporating ion exclusion effects was applied to investigate water softening performance including ion selectivity, ion removal efficiency and energy consumption in a constant voltage (CV) mode MCDI. Trade-offs between the simulated Ca2+ selectivity and Ca2+ removal efficiency under varying applied voltage and varying initial concentration ratio of Na+ to Ca2+ were observed. A cut-off CV mode, which was operated to maximize Ca2+ removal efficiency per cycle, was found to lead to a specific energy consumption (SEC) of 0.061 kWh/mole removed Ca2+ for partially softening industrial water and 0.077 kWh/m3 removed Ca2+ for slightly softening tap water at a water recovery of 0.5. This is an order of magnitude less than reported values for other softening techniques. MCDI should be explored more fully as an energy efficient means of water softening.
Xin Zhang; Danny Reible. Theoretical Analysis of Constant Voltage Mode Membrane Capacitive Deionization for Water Softening. Membranes 2021, 11, 231 .
AMA StyleXin Zhang, Danny Reible. Theoretical Analysis of Constant Voltage Mode Membrane Capacitive Deionization for Water Softening. Membranes. 2021; 11 (4):231.
Chicago/Turabian StyleXin Zhang; Danny Reible. 2021. "Theoretical Analysis of Constant Voltage Mode Membrane Capacitive Deionization for Water Softening." Membranes 11, no. 4: 231.
Capping with layers of inert or adsorptive materials is used to control the release of polycyclic aromatic hydrocarbons (PAH) in sediment but little is known about microbial degradation processes in these materials. A rich native microbial community inhabits the sediment bed, and capping media can influence enrichment and biodegradation activity of benthic microorganisms. The aim of this study was to evaluate the effects of capping media (sand, organoclay, and powdered activated carbon [PAC]) on microbial communities under oxic conditions typical of the cap-water interface, where naphthalene degradation (model PAH) is likely to be maximized. Bench scale experiments compared naphthalene concentrations, nahAc biomarker abundance, microbial community composition, and cellular attachment in systems amended with adsorptive and non-adsorptive capping materials. Results indicate that activated carbon promoted and enhanced bioactivity; PAC treatments showed high biodegradation rates, nahAc biomarker levels, and attached biological growth consistent with enrichment of the PAH-degrading genus Pseudomonae. In contrast, sand did not enhance biological activity compared to media-free systems. Naphthalene strongly influenced microbial community composition at the species level in all treatments except organoclay, which promoted biological signatures commonly associated with impeding degradation activity. Data overall suggest that adsorptive capping materials can both promote (PAC) and inhibit (organoclay) bioactivity in the surficial layer of caps, indicating that media selection is critical to the design of bioactive capping systems.
Giovanna Pagnozzi; Danny D. Reible; Kayleigh Millerick. The effects of adsorptive materials on microbial community composition and PAH degradation at the sediment cap–water interface. International Journal of Sediment Research 2020, 36, 555 -565.
AMA StyleGiovanna Pagnozzi, Danny D. Reible, Kayleigh Millerick. The effects of adsorptive materials on microbial community composition and PAH degradation at the sediment cap–water interface. International Journal of Sediment Research. 2020; 36 (4):555-565.
Chicago/Turabian StyleGiovanna Pagnozzi; Danny D. Reible; Kayleigh Millerick. 2020. "The effects of adsorptive materials on microbial community composition and PAH degradation at the sediment cap–water interface." International Journal of Sediment Research 36, no. 4: 555-565.
In the arid west, the freshwater supply of many communities is limited, leading to increased interest in tapping brackish water resources. Although reverse osmosis is the most common technology to upgrade saline waters, there is also interest in developing and improving alternative technologies. Here we focus on membrane capacitive deionization (MCDI), which has attracted broad attention as a portable and energy-efficient desalination technology. In this study, a fully coupled two-dimensional MCDI process model capable of capturing transient ion transport and adsorption behaviors was developed to explore the function of the ion-exchange membrane (IEM) and detect MCDI influencing factors via sensitivity analysis. The IEM enhanced desalination by improving the counter-ions’ flux and increased adsorption in electrodes by encouraging retention of ions in electrode macropores. An optimized cycle time was proposed with maximal salt removal efficiency. The usage of the IEM, high applied voltage, and low flow rate were discovered to enhance this maximal salt removal efficiency. IEM properties including water uptake volume fraction, membrane thickness, and fixed charge density had a marginal impact on cycle time and salt removal efficiency within certain limits, while increasing cell length and electrode thickness and decreasing channel thickness and dispersivity significantly improved overall performance.
Xin Zhang; Danny Reible. Exploring the Function of Ion-Exchange Membrane in Membrane Capacitive Deionization via a Fully Coupled Two-Dimensional Process Model. Processes 2020, 8, 1312 .
AMA StyleXin Zhang, Danny Reible. Exploring the Function of Ion-Exchange Membrane in Membrane Capacitive Deionization via a Fully Coupled Two-Dimensional Process Model. Processes. 2020; 8 (10):1312.
Chicago/Turabian StyleXin Zhang; Danny Reible. 2020. "Exploring the Function of Ion-Exchange Membrane in Membrane Capacitive Deionization via a Fully Coupled Two-Dimensional Process Model." Processes 8, no. 10: 1312.
The purpose of this work-in-progress research paper is to explore how engineering students’ phronesis (ethical judgement or practical wisdom) can be fostered in an interdisciplinary graduate course that incorporates the arts and humanities. We present our research findings and implications from the data gathered from an innovative pilot course taught at a university in the south-central United States. Using the philosophical concept of phronesis as a guiding theoretical framework, we examined the writing of ten engineering graduate students who were enrolled in the course. The corpus of data included pre- and post-course essays, autobiographies, and samples of weekly reflective writing completed after reading about and discussing ethical dilemmas and other contextual considerations of engineering work. The data were analyzed inductively and deductively, generating categories and themes from coded data (bottom-up) as well as observing categories and themes implied in the course activities (top-down). The findings indicate preliminary signs concerning the students’ development of phronesis through each week’s learning activities. For example, they learned to be more open to others’ ideas while simultaneously doubtful of their own thinking. They also became more attentive to the question of morality and ethics when considering engineering applications. Particularly, they learned to connect local engineering issues to broader implications. The significance of the study is three-fold: First, it shows an example of the value of educational theory and philosophy in advancing engineering education using the philosophical notion of phronesis. Second, the findings suggest the potential effectiveness of the curriculum that integrates the arts and humanities in cultivating engineering students’ development of phronesis to become reflective practitioners. Lastly, the implications of our research provide future directions for improving and even rethinking engineering education.
Jeong-Hee Kim; Ryan C. Campbell; Ngan T.T. Nguyen; Roman Taraban; Danny D. Reible; Chongzheng Na. Exploring Ways to Develop Reflective Engineers: Toward Phronesis-Centered Engineering Education. 2019 ASEE Annual Conference & Exposition Proceedings 2020, 1 .
AMA StyleJeong-Hee Kim, Ryan C. Campbell, Ngan T.T. Nguyen, Roman Taraban, Danny D. Reible, Chongzheng Na. Exploring Ways to Develop Reflective Engineers: Toward Phronesis-Centered Engineering Education. 2019 ASEE Annual Conference & Exposition Proceedings. 2020; ():1.
Chicago/Turabian StyleJeong-Hee Kim; Ryan C. Campbell; Ngan T.T. Nguyen; Roman Taraban; Danny D. Reible; Chongzheng Na. 2020. "Exploring Ways to Develop Reflective Engineers: Toward Phronesis-Centered Engineering Education." 2019 ASEE Annual Conference & Exposition Proceedings , no. : 1.
Can the arts and humanities provide key perspectives for engineers in developing awareness of and interest in the environmental and sociotechnical impacts of engineering? How might essential habits and skills necessary for engineers to meaningfully address these impacts be learned using the arts and humanities? We are exploring such questions under a grant from the National Science Foundation to develop and assess a curriculum that explores methods of fostering reflective habits and skills in graduate students through activities involving the arts and humanities. Largely informed by the theories of John Dewey, Elliot Eisner, and Donald Schön, our experimental curriculum includes such activities as autobiographical writing with an accompanying art creation, reading about and discussing ethical dilemmas, practicing visual thinking strategies (VTS), writing weekly reflective essays, reading and discussing fiction with strong environmental justice themes, and even collaborating on art projects with graduate students in the School of Art. Incorporating aspects of the arts and humanities to complement engineering thought and action is a critical component of our work, which we describe as developing reflective engineers through artful methods. In this paper, we present findings from two instantiations of a newly designed graduate course in civil/environmental engineering that integrates the arts and humanities. The objective of our course is to develop engineers who are more reflective than traditionally trained engineers and are thereby better able to: (a) understand and address the complexities of modern real-world challenges, (b) make better ethical decisions, and (c) serve the public not only with technical engineering skills but with mindfulness of and sensitivity to the complex social, cultural, and environmental contexts their work. Thus far, results have been encouraging from both our surveys (reported here) and our analyses of student interviews and writing samples (reported elsewhere). For example, aggregate results from the pre/post Likert-type surveys (n = 19) showed statistically significant increases in Insight, which is a metacognitive factor central to the process of purposeful & directed change (p < 0.02, d > 0.3) and in Contextual Competence, which is an engineering-specific measure of contextual understand (p < 0.001, d > 0.8). We also observed potentially significant increases in Reflective Skepticism (p < 0.1, d > 0.3), which is a measure of reflection regarding the tendency to learn from one’s past experiences and be questioning of evidence, and in Interdisciplinary Skills (p < 0.3, d > 0.3). These self-reported survey results, despite the small number of participants, suggest clear potential that engineering students can develop their capacity for reflection through arts- and humanities-based activities.
Ryan C. Campbell; Danny D. Reible; Roman Taraban; Jeong-Hee Kim; Chongzheng Na. Fostering Reflective Habits and Skills in Graduate Engineering Education via the Arts and Humanities. 2020 ASEE Virtual Annual Conference Content Access Proceedings 2020, 1 .
AMA StyleRyan C. Campbell, Danny D. Reible, Roman Taraban, Jeong-Hee Kim, Chongzheng Na. Fostering Reflective Habits and Skills in Graduate Engineering Education via the Arts and Humanities. 2020 ASEE Virtual Annual Conference Content Access Proceedings. 2020; ():1.
Chicago/Turabian StyleRyan C. Campbell; Danny D. Reible; Roman Taraban; Jeong-Hee Kim; Chongzheng Na. 2020. "Fostering Reflective Habits and Skills in Graduate Engineering Education via the Arts and Humanities." 2020 ASEE Virtual Annual Conference Content Access Proceedings , no. : 1.
ABET is committed to promoting the broad development of engineering students including knowledge of the social, cultural, environmental, and global implications of engineering practice. Coincident with the cultural shift within engineering education is a scholarly interest in the communications of engineers and students. The present study is situated in a graduate course in environmental engineering that incorporated lectures and activities that used art and narrative topics with the goal of making students more reflective about engineering practices. The goal of this paper is to describe and analyze two methods of machine-based formative assessment of students’ essays written in response to these lectures. The two machine tools used were i) naïve Bayes analysis and ii) Meaning Extraction Helper. The results showed that both methods were able to identify differences in student essays. We suggest several ways in which these machine methods could be extended to aid in assessing learning and reflective thinking in students.
Roman Taraban; David Robledo; Francesco V. Donato; Ryan C. Campbell; Jeong-Hee Kim; Danny D. Reible; Chongzheng Na. Machine-assisted Analysis of Communication in Environmental Engineering. 2020 ASEE Virtual Annual Conference Content Access Proceedings 2020, 1 .
AMA StyleRoman Taraban, David Robledo, Francesco V. Donato, Ryan C. Campbell, Jeong-Hee Kim, Danny D. Reible, Chongzheng Na. Machine-assisted Analysis of Communication in Environmental Engineering. 2020 ASEE Virtual Annual Conference Content Access Proceedings. 2020; ():1.
Chicago/Turabian StyleRoman Taraban; David Robledo; Francesco V. Donato; Ryan C. Campbell; Jeong-Hee Kim; Danny D. Reible; Chongzheng Na. 2020. "Machine-assisted Analysis of Communication in Environmental Engineering." 2020 ASEE Virtual Annual Conference Content Access Proceedings , no. : 1.
Evaluating sediment recontamination due to stormwater discharges is important when evaluating the long‐term effectiveness of sediment remedial efforts in reducing biological impacts. The bioaccumulation of the heavy metals, Zn, Ni, Cu, Cd, Hg and Pb, and the metalloid As in a clam Macoma nasuta was studied in surficial sediments before and after stormwater inputs from Paleta Creek, CA during wet seasons in 2015‐2016 and 2016‐2017. The bioaccumulation was compared to bulk sediment concentrations and porewater concentrations measured by diffusion gradient in thin film devices. Significant reductions in biota accumulation and porewater concentrations were observed in samples collected after storm seasons compared to before storm seasons despite bulk sediment concentrations remaining the same or increasing. This was apparently the result of the deposition of stormwater contaminants in low bioavailable forms. The bioaccumulation of all the measured contaminants showed a positive significant correlation with porewater concentrations (p<0.1, α=0.1) and weak or no correlations with bulk sediment concentration. In conclusion, observed bulk sediment recontamination due to stormwater should not be assumed to lead directly to greater biota accumulation without bioavailability assessment. This article is protected by copyright. All rights reserved.
Ilektra Drygiannaki; Michelle Bejar; Danny D. Reible; John A. Dawson; Balaji Rao; Nicholas T. Hayman; Gunther H. Rosen; Marienne A. Colvin. Assessing Biota Accumulation Due to Contamination of Sediments by Storm Water Heavy Metals. Environmental Toxicology and Chemistry 2020, 1 .
AMA StyleIlektra Drygiannaki, Michelle Bejar, Danny D. Reible, John A. Dawson, Balaji Rao, Nicholas T. Hayman, Gunther H. Rosen, Marienne A. Colvin. Assessing Biota Accumulation Due to Contamination of Sediments by Storm Water Heavy Metals. Environmental Toxicology and Chemistry. 2020; ():1.
Chicago/Turabian StyleIlektra Drygiannaki; Michelle Bejar; Danny D. Reible; John A. Dawson; Balaji Rao; Nicholas T. Hayman; Gunther H. Rosen; Marienne A. Colvin. 2020. "Assessing Biota Accumulation Due to Contamination of Sediments by Storm Water Heavy Metals." Environmental Toxicology and Chemistry , no. : 1.
Volatile losses of hydrophobic organic contaminants from a confined disposal facility (CDF) containing dredged contaminated sediments is of substantial concern to surrounding communities. A partitioning passive sampling approach using polyoxymethylene (POM) was applied to measure long-term average (weeks to months) air concentrations resulting from evaporation at a CDF. Measurements at 10 locations surrounding the CDF using the POM air samplers indicated that the highest concentrations of ΣPCBs∼13 ng/m3 and ΣPAHs ∼ 65 ng/m3 were measured during an active dredge material placement period when the average temperature was 23 o C. The measurements were dominated by the more volatile, lower molecular weight compounds of each type. Partitioning to the POM during the post dredge material placement period with average temperature of 5 o C was corrected for temperature and the measured ∑PCBs and ∑PAHs were ∼3 ng/m3 and 45 ng/m3 respectively. The partitioning passive sampling measurements agreed well with the available weekly 24-hour high-volume air samples (HVAS) averaged over the POM equilibration time for lower congener number PCBs (15, 18, 20/28 and 31) and naphthalene but were as much as 10 times lower than HVAS for high molecular weight PAHs. The difference was likely the result of the greater association of these PAHs with particulates and sources other than evaporation from the CDF. The POM air sampler achieved the goal of providing a long-term average air concentration without having to collect, analyze and average multiple HVAS samples although the technique is largely limited to the lower molecular weight PAHs and PCBs and different equilibration times for different compounds complicate its use and analysis.
Adesewa A. Odetayo; Danny D. Reible; Damarys Acevedo-Mackey; Cynthia Price; Le Thai. Application of polyoxymethylene passive air sampler to monitor hydrophobic organics in air around a confined disposal facility. Chemosphere 2020, 263, 127827 .
AMA StyleAdesewa A. Odetayo, Danny D. Reible, Damarys Acevedo-Mackey, Cynthia Price, Le Thai. Application of polyoxymethylene passive air sampler to monitor hydrophobic organics in air around a confined disposal facility. Chemosphere. 2020; 263 ():127827.
Chicago/Turabian StyleAdesewa A. Odetayo; Danny D. Reible; Damarys Acevedo-Mackey; Cynthia Price; Le Thai. 2020. "Application of polyoxymethylene passive air sampler to monitor hydrophobic organics in air around a confined disposal facility." Chemosphere 263, no. : 127827.
Danny D. Reible. Book review of Mechanics of Bio-Sediment Transport, Hongwei Fang, Lei Huang, Huiming Zhao, Wei Cheng, Yishan Chen, Mehdi Fazeli, Qianqin Shang (Eds.), Springer-Verlag, Berlin Heidelberg (2020). International Journal of Sediment Research 2020, 36, 161 -162.
AMA StyleDanny D. Reible. Book review of Mechanics of Bio-Sediment Transport, Hongwei Fang, Lei Huang, Huiming Zhao, Wei Cheng, Yishan Chen, Mehdi Fazeli, Qianqin Shang (Eds.), Springer-Verlag, Berlin Heidelberg (2020). International Journal of Sediment Research. 2020; 36 (1):161-162.
Chicago/Turabian StyleDanny D. Reible. 2020. "Book review of Mechanics of Bio-Sediment Transport, Hongwei Fang, Lei Huang, Huiming Zhao, Wei Cheng, Yishan Chen, Mehdi Fazeli, Qianqin Shang (Eds.), Springer-Verlag, Berlin Heidelberg (2020)." International Journal of Sediment Research 36, no. 1: 161-162.
The effects of a model natural organic matter (NOM) on the transport of Hg(II) into diffusive gradient in thin-film devices (DGTs) was evaluated in order to better understand their ability to measure colloidal Hg species in porewater. The presence of NOM significantly reduced the diffusivity of the Hg(II) species and the reduction was dependent upon NOM to Hg(II) ratio. This relationship was modeled by determining the Hg(II) partition coefficients (Kd) of size fractionated NOM obtained by ultrafiltration and estimating the Hg diffusivity through the DGT for the different NOM size fractions across a range of Hg-NOM ratios. The estimated diffusivities were consistent with experimental observations of uptake into the DGT. Overall, this study indicated that Hg(II) associated with NOM passes into a DGT, however the transport is slowed in accordance with the diffusivity of the NOM to which the Hg(II) is associated. Thus, the Hg—NOM association and complex diffusivities need to be considered when relating DGT uptake to Hg porewater concentration. The results also suggest that Hg(II) associated with colloidal or larger particles of negligible diffusivity are unlikely to contribute significantly to DGT measurements.
Garret D. Bland; Balaji Rao; Danny Reible. Evaluating the transport of Hg(II) in the presence of natural organic matter through a diffusive gradient in a thin-film passive sampler. Science of The Total Environment 2020, 749, 141217 .
AMA StyleGarret D. Bland, Balaji Rao, Danny Reible. Evaluating the transport of Hg(II) in the presence of natural organic matter through a diffusive gradient in a thin-film passive sampler. Science of The Total Environment. 2020; 749 ():141217.
Chicago/Turabian StyleGarret D. Bland; Balaji Rao; Danny Reible. 2020. "Evaluating the transport of Hg(II) in the presence of natural organic matter through a diffusive gradient in a thin-film passive sampler." Science of The Total Environment 749, no. : 141217.
Passive sampling and bioaccumulation assessments were used to evaluate the performance of activated carbon (AC) remediation of polychlorinated biphenyl (PCB) contaminated sediment offshore in Parcel F of the former Hunters Point Naval Shipyard (HPNS) (San Francisco, California). Two different composite AC materials, AquaGate+PAC™ (86 tons) and SediMite™ (24 tons) were placed on the sediment surface covering an area of 3200 m2. PCB tissue concentrations in the clam Macoma nasuta were reduced 75 to 80% in pilot amendment areas after 8 months and 84–87% in non-lipid normalized tissues after 14 months during in situ monitoring, confirming the effectiveness of the AC at reducing bioavailability of the PCBs. Polydimethylsiloxane (PDMS) passive samplers were applied to evaluate and monitor freely dissolved concentrations (Cfree) of PCBs in sediment porewater before AC placement (i.e., during baseline) and at 8 months, 14 months and 26 months following placement. Although AC composite materials were placed only at the surface, 80% reductions were observed to a depth of 16 cm after 8 months and up to 26 cm after 26 months in AquaGate+PAC treatment area. Total PCB porewater concentrations in surface sediments (1–6 cm) were reduced 89 and 91% in the AquaGate+PAC and SediMite areas during final sampling. Ex situ passive sampling showed porewater concentrations 2–5 times larger than in situ measurements due to the absence of hyporheic exchange in laboratory measurements and near equilibration between sediment and porewater. Estimated post placement ex situ porewater concentrations were more consistent with a model of bioaccumulation using the octanol-water partition coefficient (KOW) as a bioaccumulation factor leading to a hypothesis that the bioaccumulation factor in the deposit feeding clam is better estimated by equilibrium ex situ porewater measurements.
Songjing Yan; Magdalena Rakowska; Xiaolong Shen; Theresa Himmer; Cameron Irvine; Rachel Zajac-Fay; Jamie Eby; Danielle Janda; Sharon Ohannessian; Danny D. Reible. Bioavailability assessment in activated carbon treated coastal sediment with in situ and ex situ porewater measurements. Water Research 2020, 185, 116259 .
AMA StyleSongjing Yan, Magdalena Rakowska, Xiaolong Shen, Theresa Himmer, Cameron Irvine, Rachel Zajac-Fay, Jamie Eby, Danielle Janda, Sharon Ohannessian, Danny D. Reible. Bioavailability assessment in activated carbon treated coastal sediment with in situ and ex situ porewater measurements. Water Research. 2020; 185 ():116259.
Chicago/Turabian StyleSongjing Yan; Magdalena Rakowska; Xiaolong Shen; Theresa Himmer; Cameron Irvine; Rachel Zajac-Fay; Jamie Eby; Danielle Janda; Sharon Ohannessian; Danny D. Reible. 2020. "Bioavailability assessment in activated carbon treated coastal sediment with in situ and ex situ porewater measurements." Water Research 185, no. : 116259.
Recontamination of sediments by stormwater is a major concern when evaluating the potential effectiveness of sediment remediation. Stormwater and sediment sampling were conducted in a mixed-use watershed at Paleta Creek in San Diego, CA to evaluate methods for assessing sediment recontamination by metals. Size-segregated stormwater contaminant loads with simultaneous receiving water and sediment measurements were used to identify dominant sources and contaminants with respect to their impact on sediment recontamination. Most of the stormwater contaminant loads of Cd, Cu, Pb, and Zn were associated with residential and highway sources from the upstream portions of the watershed and As, Ni and Hg were more significantly influenced by the downstream area of the watershed. Cd was strongly associated with large particles (>63 μm) and observed to settle in near shore areas with some attenuation due to mixing and dilution. Cu, in contrast, was associated more with the filtered fraction (<0.45 μm) and clay fraction (0.45–5 μm), resulting in less near shore sediment recontamination. Depositing sediment and other metals, particularly Cu and Hg, exhibited greater accumulation in settling traps than could be attributed to stormwater loads indicating the importance of other sources or resuspension of bay sediments on surficial sediment concentrations. Pb, Zn, Ni, and As showed influences of both stormwater and other sources. The study showed that measurement of size-segregated stormwater contaminant mass and concentrations combined with simultaneous measurements of deposition in sediment traps could differentiate between recontamination by stormwater and that of other sources.
Ilektra Drygiannaki; Balaji Rao; John A. Dawson; Magdalena Rakowska; Danny D. Reible; Nicholas T. Hayman; Gunther H. Rosen; Marienne A. Colvin; D. Bart Chadwick; Robert Pitt; Megan Otto; Brandon Steets; Jared Ervin. Assessing sediment recontamination from metals in stormwater. Science of The Total Environment 2020, 737, 139726 .
AMA StyleIlektra Drygiannaki, Balaji Rao, John A. Dawson, Magdalena Rakowska, Danny D. Reible, Nicholas T. Hayman, Gunther H. Rosen, Marienne A. Colvin, D. Bart Chadwick, Robert Pitt, Megan Otto, Brandon Steets, Jared Ervin. Assessing sediment recontamination from metals in stormwater. Science of The Total Environment. 2020; 737 ():139726.
Chicago/Turabian StyleIlektra Drygiannaki; Balaji Rao; John A. Dawson; Magdalena Rakowska; Danny D. Reible; Nicholas T. Hayman; Gunther H. Rosen; Marienne A. Colvin; D. Bart Chadwick; Robert Pitt; Megan Otto; Brandon Steets; Jared Ervin. 2020. "Assessing sediment recontamination from metals in stormwater." Science of The Total Environment 737, no. : 139726.
The release of oil and gas at Mississippi Canyon Block 20 into the Gulf of Mexico has vexed response officials since 2004 when a regional seafloor failure toppled the Taylor Energy Company platform. Despite the completion of nine intervention wells, releases continue from the seafloor, mostly captured by a recently installed containment system. Toward informing resolution, this work applies chemical forensic and statistical analyses to surface sheens, sediments, and reservoir oil samples. Our results indicate sheens are chemically heterogeneous, contain remnant synthetic hydrocarbons likely discharged from well interventions prior to 2012, and require mixing of multiple chemically-distinct oil groups to explain observed variability in diagnostic ratios. Given the respite and opportunity afforded by containment we suggest leveraging ongoing collection activities to assess release dynamics, as well as engaging the National Academies of Science, Engineering, and Medicine, to evaluate potential solutions, associated risks, and to consider policy ramifications.
Wade L. Bryant; Richard Camilli; G. Burch Fisher; Edward B. Overton; Christopher M. Reddy; Danny Reible; Robert F. Swarthout; David L. Valentine. Harnessing a decade of data to inform future decisions: Insights into the ongoing hydrocarbon release at Taylor Energy's Mississippi Canyon Block 20 (MC20) site. Marine Pollution Bulletin 2020, 155, 111056 .
AMA StyleWade L. Bryant, Richard Camilli, G. Burch Fisher, Edward B. Overton, Christopher M. Reddy, Danny Reible, Robert F. Swarthout, David L. Valentine. Harnessing a decade of data to inform future decisions: Insights into the ongoing hydrocarbon release at Taylor Energy's Mississippi Canyon Block 20 (MC20) site. Marine Pollution Bulletin. 2020; 155 ():111056.
Chicago/Turabian StyleWade L. Bryant; Richard Camilli; G. Burch Fisher; Edward B. Overton; Christopher M. Reddy; Danny Reible; Robert F. Swarthout; David L. Valentine. 2020. "Harnessing a decade of data to inform future decisions: Insights into the ongoing hydrocarbon release at Taylor Energy's Mississippi Canyon Block 20 (MC20) site." Marine Pollution Bulletin 155, no. : 111056.
In this study, 76 μm polyoxymethylene (POM) strips were evaluated as a passive air sampler (PAS) for monitoring the volatile emissions from dredged material placed in confined disposal facilities (CDF). Laboratory evaluations were used to assess the uptake kinetics, average equilibrium time, and estimate the POM-air partition coefficients (KPOM-A) of 16 PCB congeners. The uptake kinetics defined the effective averaging time for air sampling and ranged from about a week for dichlorobiphenyls to 2 weeks or more for tetra- and pentachlorobiphenyls at ∼20 °C under internal mass transfer resistance control which was applicable for Log KPOM-A < 8. The measured Log KPOM-A for PCBs ranged from 5.65 to 9.34 and exhibited an average deviation of 0.19 log unit from the theoretical value of KPOM-W/KAW. The PAS approach was then tested with a preliminary field application (n = 17) at a CDF allowing equilibration over 42 days. The field application focused on lower congener PCBs as a result of the estimated increase in KPOM-A and longer uptake times expected at the low ambient temperatures during the field study (average of 3.5 °C). Total PCB air concentrations around the CDF averaged 0.32 ng/m3 and varied according to proximity to placement of the dredged materials and predominant wind directions. Average PAS concentration of low congener number PCBs (15, 18, 20/28, 31) were compared to available high volume air sampler (HVAS) measurements. The PAS concentrations were within 20% of HVAS in the dominant north and south directions and showed similar trends as east and west HVAS samplers although PAS concentrations were as much as an order of magnitude below the west HVAS.
Adesewa A. Odetayo; Danny D. Reible; Damarys Acevedo-Mackey; Cynthia Price; Le Thai. Development of polyoxymethylene passive sampler for assessing air concentrations of PCBs at a confined disposal facility (CDF). Environmental Pollution 2020, 265, 114720 .
AMA StyleAdesewa A. Odetayo, Danny D. Reible, Damarys Acevedo-Mackey, Cynthia Price, Le Thai. Development of polyoxymethylene passive sampler for assessing air concentrations of PCBs at a confined disposal facility (CDF). Environmental Pollution. 2020; 265 ():114720.
Chicago/Turabian StyleAdesewa A. Odetayo; Danny D. Reible; Damarys Acevedo-Mackey; Cynthia Price; Le Thai. 2020. "Development of polyoxymethylene passive sampler for assessing air concentrations of PCBs at a confined disposal facility (CDF)." Environmental Pollution 265, no. : 114720.
The freely dissolved concentration (Cfree) of hydrophobic organic chemicals in sediments and soils is considered the driver behind chemical bioavailability and, ultimately, toxic effects in benthic organisms. Therefore, quantifying Cfree, although challenging, is critical when assessing risks of contamination in field and spiked sediments and soils (e.g., when judging remediation necessity or interpreting results of toxicity assays performed for chemical safety assessments). Here, we provide a state-of-the-art passive sampling protocol for determining Cfree in sediment and soil samples. It represents an international consensus procedure, developed during a recent interlaboratory comparison study. The protocol describes the selection and preconditioning of the passive sampling polymer, critical incubation system component dimensions, equilibration and equilibrium condition confirmation, quantitative sampler extraction, quality assurance/control issues and final calculations of Cfree. The full procedure requires several weeks (depending on the sampler used) because of prolonged equilibration times. However, hands-on time, excluding chemical analysis, is approximately 3 d for a set of about 15 replicated samples.
Michiel T. O. Jonker; Robert M. Burgess; Upal Ghosh; Philip M. Gschwend; Sarah E. Hale; Rainer Lohmann; Michael J. Lydy; Keith A. Maruya; Danny Reible; Foppe Smedes. Ex situ determination of freely dissolved concentrations of hydrophobic organic chemicals in sediments and soils: basis for interpreting toxicity and assessing bioavailability, risks and remediation necessity. Nature Protocols 2020, 15, 1800 -1828.
AMA StyleMichiel T. O. Jonker, Robert M. Burgess, Upal Ghosh, Philip M. Gschwend, Sarah E. Hale, Rainer Lohmann, Michael J. Lydy, Keith A. Maruya, Danny Reible, Foppe Smedes. Ex situ determination of freely dissolved concentrations of hydrophobic organic chemicals in sediments and soils: basis for interpreting toxicity and assessing bioavailability, risks and remediation necessity. Nature Protocols. 2020; 15 (5):1800-1828.
Chicago/Turabian StyleMichiel T. O. Jonker; Robert M. Burgess; Upal Ghosh; Philip M. Gschwend; Sarah E. Hale; Rainer Lohmann; Michael J. Lydy; Keith A. Maruya; Danny Reible; Foppe Smedes. 2020. "Ex situ determination of freely dissolved concentrations of hydrophobic organic chemicals in sediments and soils: basis for interpreting toxicity and assessing bioavailability, risks and remediation necessity." Nature Protocols 15, no. 5: 1800-1828.
A 2-dimensional multicomponent ion transport model based on Nernst-Planck (NP) equation and electroneutrality assumption is developed for an electrodialysis (ED) cell operated in the ohmic regime. The flow in channels are assumed incompressible, isothermal, and laminar. Donnan equilibrium and flux continuity are considered at ion-exchange membrane (IEM)-solution interfaces. To account for tortuosity effects inside membranes, effective ionic diffusion coefficients are calculated using membranes water volume fractions. The developed multicomponent model is used to elucidate the effects of feed solution properties, cell properties, system hydrodynamics, operational conditions, and membrane properties on selective divalent ion removal in the cell. The results indicate that the selective removal of divalent ions improves with decreasing the cell length, imposed potential, and ionic strength of feed water. Enhanced mixing in spacer-filled cell also promotes selective divalent ion removal. Higher concentrations of fixed charges on the membranes results in greater selectivity toward divalent ions at short cell length and low imposed potentials. With equal concentrations of fixed charges, membranes with high water content are less favorable for selective divalent ion removal. The developed framework enables the optimum selection of cell design, IEMs, spacer design, and operational conditions to selectively remove ions from multicomponent solutions.
Soraya Honarparvar; Danny Reible. Modeling multicomponent ion transport to investigate selective ion removal in electrodialysis. Environmental Science and Ecotechnology 2020, 1, 100007 .
AMA StyleSoraya Honarparvar, Danny Reible. Modeling multicomponent ion transport to investigate selective ion removal in electrodialysis. Environmental Science and Ecotechnology. 2020; 1 ():100007.
Chicago/Turabian StyleSoraya Honarparvar; Danny Reible. 2020. "Modeling multicomponent ion transport to investigate selective ion removal in electrodialysis." Environmental Science and Ecotechnology 1, no. : 100007.
Brackish groundwater is a largely untapped water resource that is available in much of the arid US. The low salinity of brackish water (1000–10 000 mg/L TDS) makes it a viable alternative water supply for municipal, industrial, and agricultural applications. Improvements in desalination technologies are required to fully utilize these waters. Electrodialysis (ED), capacitive deionization (CDI), and membrane capacitive deionization (MCDI) are tunable techniques with low energy requirements and operational costs and have advantages over conventional reverse osmosis (RO) in many applications. The aim of the current effort is identifying the conditions under which these technologies may be applicable and developing models of these processes for the purposes of optimization and design. A steady-state 2D ion transport model for ED and a 2D transient ion transport-adsorption model for (M)CDI are presented. The models are capable of successfully describing the concentrations and potential distributions in the processes during brackish water desalination. The models are used to describe the effects of thermodynamics, hydrodynamics, and operating conditions on ion transport in these systems.
Soraya Honarparvar; Xin Zhang; Tianyu Chen; Chongzheng Na; Danny Reible. Modeling technologies for desalination of brackish water — toward a sustainable water supply. Current Opinion in Chemical Engineering 2019, 26, 104 -111.
AMA StyleSoraya Honarparvar, Xin Zhang, Tianyu Chen, Chongzheng Na, Danny Reible. Modeling technologies for desalination of brackish water — toward a sustainable water supply. Current Opinion in Chemical Engineering. 2019; 26 ():104-111.
Chicago/Turabian StyleSoraya Honarparvar; Xin Zhang; Tianyu Chen; Chongzheng Na; Danny Reible. 2019. "Modeling technologies for desalination of brackish water — toward a sustainable water supply." Current Opinion in Chemical Engineering 26, no. : 104-111.
To assess potential impacts associated with stormwater contaminants on receiving systems, laboratory 10‐d amphipod (Eohaustorius estuarius) survival toxicity tests were performed using intact sediment cores collected from Paleta Creek (San Diego Bay, California, USA) on five occasions between 2015‐2017. The approach included deposition‐associated sediment particles collected from sediment traps placed at each of four locations during the 2015‐2016 wet seasons. The bioassays demonstrated wet season toxicity, especially closest to the creek mouth, and greater mortality associated with wet‐season deposited particles when compared with dry season samples. Grain size analysis of sediment trap material indicated coarser sediment at the mouth of the creek and finer sediment in the outer depositional areas. Metal (Cd, Cu, Hg, Ni, Pb, Zn) and organic (polycyclic aromatic hydrocarbons, polychlorinated biphenyls and pesticides) contaminant concentrations were quantified to assess possible causes of toxicity. Contaminant concentrations were determined in the top 5‐cm of sediment and porewater (using passive samplers). While metals, PAHs, and PCBs were rarely detected at sufficient concentrations to elicit a response, pyrethroid pesticides were highly correlated with amphipod toxicity. Summing individual pyrethroid constituents using a toxic unit approach suggested toxicity to E. estuarius could be associated with pyrethroids. This unique test design allowed delineation of spatial and temporal differences in toxicity, suggesting that stormwater discharge from Paleta Creek may be the source of seasonal toxicity. This article is protected by copyright. All rights reserved.
Nicholas T. Hayman; Gunther H. Rosen; Marienne A. Colvin; Bart D. Chadwick; Balaji Rao; Dimitrios Athanasiou; Magdalena Rakowska; Ilektra Drygiannaki; G. Allen Burton Jr.; Danny Reible. Seasonal Toxicity Observed with Amphipods ( Eohaustorius estuarius ) at Paleta Creek, San Diego Bay, USA. Environmental Toxicology and Chemistry 2019, 39, 229 -239.
AMA StyleNicholas T. Hayman, Gunther H. Rosen, Marienne A. Colvin, Bart D. Chadwick, Balaji Rao, Dimitrios Athanasiou, Magdalena Rakowska, Ilektra Drygiannaki, G. Allen Burton Jr., Danny Reible. Seasonal Toxicity Observed with Amphipods ( Eohaustorius estuarius ) at Paleta Creek, San Diego Bay, USA. Environmental Toxicology and Chemistry. 2019; 39 (1):229-239.
Chicago/Turabian StyleNicholas T. Hayman; Gunther H. Rosen; Marienne A. Colvin; Bart D. Chadwick; Balaji Rao; Dimitrios Athanasiou; Magdalena Rakowska; Ilektra Drygiannaki; G. Allen Burton Jr.; Danny Reible. 2019. "Seasonal Toxicity Observed with Amphipods ( Eohaustorius estuarius ) at Paleta Creek, San Diego Bay, USA." Environmental Toxicology and Chemistry 39, no. 1: 229-239.
Models that have been developed to quantify the oxygen flux at the sediment‐water interface (SWI) generally do not explicitly consider the influence of bioroughness (mounds and burrows) and bioirrigation. We performed a numerical study of the influence of overlying water velocity, bioroughness, and bioirrigation on the oxygen flux across the sediment‐water interface. We found that compared with a flat bed, bioroughness significantly increases O2 transport at the SWI as a result of enhanced turbulence and pressure differences across the roughness. Bioirrigation can also enhance O2 transport across the SWI by a factor of up to 10 when the roughness Reynolds number (Re*) is low, but the influence of bioirrigation decreases with increasing Re*. Burrows increase O2 penetration depth, and bioirrigation causes asymmetric distributions of O2 along burrows. Despite the complexity of O2 distribution in sediments, the net exchange across the SWI can be described by the relationship of O'Connor and Harvey (2008) when the shape is 2 dimensional or when the burrow density is low. When the burrow density is large, flow is 3 dimensional and flow interactions between burrows become important. Under these conditions the net exchange across the SWI increases by up to a factor of 4. A burrow number is introduced, Bu = [burrow density]1/2[burrow height], to correct the coefficient in O'Connor and Harvey's relationship, i.e. a=0.005 for Bu>0.1.
Y. Liu; D. Reible; F. Hussain; H. Fang. Role of Bioroughness, Bioirrigation, and Turbulence on Oxygen Dynamics at the Sediment‐Water Interface. Water Resources Research 2019, 55, 8061 -8075.
AMA StyleY. Liu, D. Reible, F. Hussain, H. Fang. Role of Bioroughness, Bioirrigation, and Turbulence on Oxygen Dynamics at the Sediment‐Water Interface. Water Resources Research. 2019; 55 (10):8061-8075.
Chicago/Turabian StyleY. Liu; D. Reible; F. Hussain; H. Fang. 2019. "Role of Bioroughness, Bioirrigation, and Turbulence on Oxygen Dynamics at the Sediment‐Water Interface." Water Resources Research 55, no. 10: 8061-8075.