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Occurrence and treatment of hexavalent chromium and arsenic in Arizona municipal and industrial waters

Description
Arsenic (As) and chromium (Cr) occur naturally in AZ surface and groundwaters, pose different health impacts, and exhibit different treatment efficacies. Hexavalent chromium (Cr(VI)) has newly recognized human health concerns, and State and Federal agencies are evaluating a low Cr(VI)-specific maximum contaminant level (MCL) for drinking water. Occurrence of Cr…

Arsenic (As) and chromium (Cr) occur naturally in AZ surface and groundwaters, pose different health impacts, and exhibit different treatment efficacies. Hexavalent chromium (Cr(VI)) has newly recognized human health concerns, and State and Federal agencies are evaluating a low Cr(VI)-specific maximum contaminant level (MCL) for drinking water. Occurrence of Cr and As in municipal drinking waters and industrial cooling tower waters was quantified by grab samples and compared with sampling results obtained from a new passive sampler developed specifically for Cr(VI). Cr(VI) and As concentrations in groundwater used for cooling tower make-up water concentrations were ~3 ppb and ~4 ppb, respectively, and were concentrated significantly in blowdown water (~20 ppb and ~40 ppb). Based upon pending Cr(VI), As, and other metal regulations, these blowdown waters will need routine monitoring and treatment. Cr(VI) concentrations in a water treatment plant (WTP) raw and finished water samples varied from 0.5 and 2 ppb for grab samples collected every 4 hours for 7 consecutive days using an ISCO sampler. The development of an ion exchange (IX) based passive sampler was validated in the field at the WTP and yielded an average exposure within 1 standard deviation of ISCO sampler grab data. Sampling at both the WTP and cooling towers suggested sources of Cr(III) from treatment chemicals or wood preservatives may exist. Since both facilities use chlorine oxidants, I quantified the apparent (pH=5) second-order rate constant for aqueous chlorine (HOCl/OCl-) with Cr(III) to form Cr(VI) as 0.7 M-1s-1. Under typical conditions (2 ppb Cr(III) ; 2 mg/L Cl2) the half-life for the conversion of Cr(III) to the more toxic form Cr(VI) is 4.7 hours. The occurrence studies in AZ and CA show the Cr(VI) and As treatment of groundwaters will be required to meet stringent Cr(VI) regulations. IX technologies, both strong base anion (SBA) and weak base anion (WBA) resin types were screened (and compared) for Cr removal. The SBA IX process for As removal was optimized by utilizing a reactive iron coagulation and filtration (RCF) process to treat spent IX brine, which was then reused to for SBA resin regeneration.
ContributorsBowen, Alexandra (Author) / Paul, Westerhoff K. (Thesis advisor) / Hristovski, Kiril (Committee member) / Halden, Rolf (Committee member) / Arizona State University (Publisher)
Created2014
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Performing the Electrical or My Heart is an Electromagnetic Chamber Scenographies of Power, Ecology and Speculative Practice

Description
Performing the Electrical traces the histories and futures of electrical discovery and knowledge through cultural performances, socio-political assemblages, and the more-than-human worldmaking functions of energy in general and electricity in particular, or what I refer to as energy-as-electricity. This project seeks to transform how energy-as-electricity is perceived, and thereby to…

Performing the Electrical traces the histories and futures of electrical discovery and knowledge through cultural performances, socio-political assemblages, and the more-than-human worldmaking functions of energy in general and electricity in particular, or what I refer to as energy-as-electricity. This project seeks to transform how energy-as-electricity is perceived, and thereby to re-vision the impact that energy-rich relationships might have ecologically—in both the social and environmental senses of the word. As a practice-led inquiry I use my scenographic sensibilities in combination with performance studies and energy humanities lenses to identify how energy-scapes form through social performances, material relations, and aesthetic/ritualistic interventions. This approach allows me to synthesize vastly different scales of energy-as-electricity performatives and spatialities and propose alternative framings which work towards decolonizing and re-feminizing energy-rich relationships. This research considers the way power flows, accumulates, and transforms through performance as embodied expression, practice and eventful doings of human and more-than-human agents. It asks: if place is practiced space (Henri Lefebvre), how can decolonizing and re-feminizing energy-rich relationships transform normative power relationships (or power geometries, as cultural geographer Doreen Massey refers to such globalized interconnections)—which are formed through electricity, technologies and colonial-capitalism? I ground this inquiry as an ecological intervention in order to investigate how performing with electricity differently (both in collective imaginations and quotidian interactions), can change the ways that electricity is produced and consumed in the time of the Anthropocene, Capitalocene, and Plasticene. The following study produces written and tacit knowledge that expands the framing of energy-rich relationships shared between human and more-than-human performatives. My provocation is that experiential encounters are critical for expanding the ontological plurality of energy-as-electricity with ecological a/effect. Drawing on the insights of performance scenographer Rachel Hann, I demonstrate that scenographic methodologies in an expanded field, along with embodied sensing, provide productive insights into this endeavor of expansion. This project both serves as a space making/space keeping provocation and offers a methodology for devising more desirable futures.
ContributorsFoster Gluck, Geneva (Author) / Underiner, Tamara (Thesis advisor) / Hunt, Kristin (Committee member) / McHugh, Kevin (Committee member) / Arizona State University (Publisher)
Created2020
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Performing the Electrical: Ecologies of the Imaginary and Fem-Technologies

Description

As speculative aesthetics, what might feminist ontologies and artist imaginings do for rethinking the "real" assemblages and infrastructures of our quotidian experience, particularly with respect to those that standardize aggressive capital agendas, maximum industrial output and extreme waste? This paper draws connections between female artists' image and event-making, speculative design…

As speculative aesthetics, what might feminist ontologies and artist imaginings do for rethinking the "real" assemblages and infrastructures of our quotidian experience, particularly with respect to those that standardize aggressive capital agendas, maximum industrial output and extreme waste? This paper draws connections between female artists' image and event-making, speculative design and tacit knowledge, as sensing tools for technological possibilities at a time when energy dependency, in the form of electricity, is the greatest generator of fossil fuel waste and pollution. I use Remedios Varo's paintings from the mid 1930-1960s as a springboard to think about sustainability and ecological design from an embodied, fem-magic and deep-time perspective, and I draw from other female artists whose work explores technologies and energy, such as Alice Aycock, Tania Candiani, Cassie Meador and Hito Steyerl. An analysis of these artists' works allows me to explore the ways that feminist imaginings function as an ontological orientation that shifts power away from contemporary infrastructures, to decolonize and re-feminize electrical possibilities as alternative ways of engaging with and sensing assemblages.
ContributorsFoster Gluck, Geneva (Artist, Author)
Created2019-03-12
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Future of Wastewater Sensing Workshop Guide

Description

The Future of Wastewater Sensing workshop is part of a collaboration between Arizona State University Center for Nanotechnology in Society in the School for the Future of Innovation in Society, the Biodesign Institute’s Center for Environmental Security, LC Nano, and the Nano-enabled Water Treatment (NEWT) Systems NSF Engineering Research Center.…

The Future of Wastewater Sensing workshop is part of a collaboration between Arizona State University Center for Nanotechnology in Society in the School for the Future of Innovation in Society, the Biodesign Institute’s Center for Environmental Security, LC Nano, and the Nano-enabled Water Treatment (NEWT) Systems NSF Engineering Research Center. The Future of Wastewater Sensing workshop explores how technologies for studying, monitoring, and mining wastewater and sewage sludge might develop in the future, and what consequences may ensue for public health, law enforcement, private industry, regulations and society at large. The workshop pays particular attention to how wastewater sensing (and accompanying research, technologies, and applications) can be innovated, regulated, and used to maximize societal benefit and minimize the risk of adverse outcomes, when addressing critical social and environmental challenges.
ContributorsWithycombe Keeler, Lauren (Researcher) / Halden, Rolf (Researcher) / Selin, Cynthia (Researcher) / Center for Nanotechnology in Society (Contributor)
Created2015-11-01