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Hazardous Wastes (hazardous + waste)
Terms modified by Hazardous Wastes Selected AbstractsReviews: Industrial Ecology: Environmental Chemistry and Hazardous WasteJOURNAL OF INDUSTRIAL ECOLOGY, Issue 1 2001Article first published online: 8 FEB 200 [source] From Cradle to Grave: Extended Producer Responsibility for Household Hazardous Wastes in British ColumbiaJOURNAL OF INDUSTRIAL ECOLOGY, Issue 2 2001Ronald J. Driedger Summary Household hazardous wastes (HHWs), the discarded pesticides, solvents, paints, lubricating oil, and similar products common to residences throughout the industrial world, create problems for governments charged with managing solid waste. When disposed of improperly in landfills or incinerators or if dumped illegally, HHW may contribute to soil and water contamination. A most common management tool for HHW is a special collection effort that segregates HHW from normal trash and disposes of it in an approved manner, all at a higher cost to the governmental jurisdiction. The Canadian province of British Columbia (BC) has undertaken a different approach, based on the use of extended producer responsibility (EPR). BC's efforts began in 1992 with adoption of a regulation on used lubricating oil (lube oil). More than 40 million liters (L) of used lube oil have been collected annually through the EPR system established under this regulation. A regulation establishing producer responsibility for postconsumer paints followed in 1994. BC enacted an additional regulation establishing EPR in 1997 for solvents/flammable liquids, domestic pesticides, gasoline, and pharmaceuticals. As a result of the application of EPR to HHW, local government costs for managing HHW and the amount of HHW identified in municipal waste have declined. Although the regulations appear to have mixed success in prompting consumers to avoid products that result in HHW, there are indications that they may be more effective than conventional management efforts. Based on BC's experience with EPR, key factors for successful implementation include maintaining flexibility in program design, creating viable funding alternatives, aggressive enforcement to provide a level playing field, and adopting policies that maximize diversion of HHW from landfills, while minimizing waste generation, setting targets for reuse and recycling, promoting consumer awareness and convenience, involving local government jurisdictions, and monitoring outcomes. [source] Hazardous waste: the semiotics of ritual hygiene in Cuban popular religionTHE JOURNAL OF THE ROYAL ANTHROPOLOGICAL INSTITUTE, Issue 3 2009Kristina Wirtz Using a semiotic framework to examine different categorizations of ritually produced ,hazardous waste' in Cuban popular religions, I argue that the ways in which waste is produced and treated generate its social indexical value and its potential to act on people. I suggest a focus on the interactions between the materiality of ritual waste and its circulation as an object of discourse. In this view, subjectification and objectification processes are shown to be related, and the agency of subjects and objects is constituted within what Webb Keane calls the same ,representational economy'. Ethnographically, I describe two different but overlapping explanatory frameworks in how religious practitioners and the Cuban state construe the dangers of ritual waste: a religious framework in which certain kinds of waste are spiritually charged, and an epidemiological framework based on long-standing metaphors of racialized contagion. Résumé À partir de l'analyse, dans un cadre sémiotique, de différentes catégorisations de « déchets dangereux » produits par les rituels des religions populaires cubaines, l'auteure avance que la manière dont les déchets sont produits et traités génère leur valeur indexique sociale et leur capacité d'agir sur les gens. Elle suggère de se concentrer sur les interactions entre la matérialité des déchets rituels et leur circulation en tant qu'objet de discours. Selon cette approche, il apparaît que les processus de subjectification et d'objectification sont liés et que l'agencéité des sujets et des objets est constituée dans le cadre d'une même «économie représentationnelle », selon l'expression de Webb Keane. Du point de vue ethnographique, l'auteure décrit deux cadres différents, mais qui se recoupent, pour expliquer la manière dont les praticiens religieux et l'État cubain envisagent les dangers des déchets rituels : un cadre religieux dans lequel certains types de déchets portent une charge spirituelle, et un cadre épidémiologique, basé sur d'anciennes métaphores de contagion racialisée. [source] Corn and rice waste: a comparative and critical presentation of methods and current and potential uses of treated wasteINTERNATIONAL JOURNAL OF FOOD SCIENCE & TECHNOLOGY, Issue 6 2008Ioannis S. Arvanitoyannis Summary Although corn and rice waste can be hardly classified among the most hazardous waste, their treatment is very important in view of the great volume of waste materials involved. In this review article, an update is provided for most of the waste treatment techniques (composting, pyrolysis, gasification, combustion) used to alter the physical, chemical or biological character of the waste, to reduce its volume and/or toxicity and to make the waste safer for disposal. Furthermore, all current and potential uses of treated corn and rice waste such as fertilisers, biomass and biogas/biofuel are summarised. Four comprehensive tables and six figures provide a thorough presentation of both waste treatment methods (characteristics, advantages and disadvantages) and uses of treated corn and rice waste. [source] Removal of heavy metals from municipal solid waste incineration (MSWI) fly ash by traditional and microwave acid extractionJOURNAL OF CHEMICAL TECHNOLOGY & BIOTECHNOLOGY, Issue 9 2010Jun Xue Abstract BACKGROUND: Municipal solid waste incinerator (MSWI) fly ash is regarded as hazardous waste because it contains various toxic metals. A previous study has shown that fly ash can be detoxified by removal of heavy metals. In this work, the extractability of heavy metals from MSWI fly ash by traditional and microwave acid extraction were compared. RESULTS: A 24 , 1 fractional factorial experimental design was adopted using acid concentration, extraction time, temperature, and liquid/solid (L/S) ratio as the experimental factors for traditional extraction, and acid concentration, extraction time, liquid/solid (L/S) ratio and microwave power as the experimental factors for microwave extraction. The traditional extraction results show that L/S played an important role in Zn, Cd extraction while L/S ratio and extractant concentration were important for Pb extraction. However, no controlling parameter was determined for Cu and Cr extraction. For the microwave extraction, it was shown that L/S was important for Pb and Zn and extractant concentration was important for Pb, Zn and Cd. The time and the power were not significant for the extractability of heavy metals. CONCLUSION: Hydrochloric acid was an effective extractant. Microwave heating promoted extraction and shortened extraction time. Microwave acid extraction treatment is a potentially feasible method for the removal of heavy metals from MSWI fly ash. Copyright © 2010 Society of Chemical Industry [source] Recycling of nickel,metal hydride batteries.JOURNAL OF CHEMICAL TECHNOLOGY & BIOTECHNOLOGY, Issue 9 2004I: Dissolution, solvent extraction of metals Abstract Nickel,metal hydride batteries contain valuable metallic components and although they are not considered a hazardous waste, recovery of these materials is necessary from an economic point of view. In this work a hydrometallurgical method for the dissolution and separation of the metals from cylindrical nickel,metal hydride rechargeable batteries was investigated. Hydrochloric acid was employed as the leaching agent to dissolve the metals from the batteries. Dissolution of metals was investigated as a function of acid concentration, leaching time and temperature. Suitable conditions for maximum metal dissolution were 3 h leaching with 4.0 mol dm,3 hydrochloric acid solutions at 95 °C. Extraction of 98% of nickel, 100% of cobalt and 99% of rare earth elements was achieved under these conditions. Separation of the rare earths from nickel and cobalt was preliminarily investigated by single batch solvent extraction with 25% bis(2-ethylhexyl)phosphoric acid. Efficient separation via complete extraction of the rare earths was obtained at a pH of approximately 2.5 while leaving nickel and cobalt in the raffinate. A shrinking particle model which can enable, under certain conditions, evaluation of the extent of metal dissolution present in nickel,metal hydride batteries was developed. A proposed electrochemical recovery of nickel and cobalt is also briefly discussed. Copyright © 2004 Society of Chemical Industry [source] HAZARDOUS WASTE DISPOSAL: A WASTE-FUEL BLENDING APPROACHPRODUCTION AND OPERATIONS MANAGEMENT, Issue 3 2003A. DALE FLOWERS The disposal of hazardous wastes creates major economic and environmental problems. One productive use of hazardous wastes is to blend them into fuel, which mitigates damage to the environment by recycling waste into fuel and reducing fossil-fuel consumption. Operations personnel face a daunting task of efficiently blending hazardous waste into fuel, while simultaneously maintaining environmental regulatory requirements. This research develops a goal-programming approach to the waste-fuel-blending process that considers the diverse objectives of fuel managers. A realworld case study at a cement kiln illustrates the effectiveness of this approach, where the implementation followed principles of team building and quality management. [source] Specific gravity as an alternative to creatinine for estimating urine concentration in captive and wild chimpanzee (Pan troglodytes) SamplesAMERICAN JOURNAL OF PRIMATOLOGY, Issue 2 2009Stephanie F. Anestis Abstract The measurement of hormones in urine has become a widely used technique in primatology. Because urine concentration varies according to fluid intake, concentration must be measured in each sample collected, and hormone values are always expressed per unit of concentration. Traditionally, creatinine has been used as a concentration index, but some studies in humans have shown that creatinine varies among populations and even within and between individuals within a population, and that it begins to degrade after just one freeze,thaw cycle. In addition, creatinine measurement is relatively time-consuming and expensive and creates hazardous waste. In this study, we tested the hypothesis that specific gravity, or the ratio of the density of a sample to that of water, is highly correlated with creatinine measurement in urine samples collected from captive chimpanzees at the New Iberia Research Center in Louisiana and wild chimpanzees at the Ngogo study site in the Kibale National Park, Uganda. We found that specific gravity and creatinine were highly correlated in both captive (N=124) and wild (N=13) chimpanzee samples, and that specific gravity measurement was robust to actual and simulated transport conditions and repeated freeze,thaw cycles. We recommend that researchers consider specific gravity measurement as a preferable alternative to creatinine measurement in their studies of primate endocrinology. Am. J. Primatol. 71:130,135, 2009. © 2008 Wiley-Liss, Inc. [source] Hazardous waste: the semiotics of ritual hygiene in Cuban popular religionTHE JOURNAL OF THE ROYAL ANTHROPOLOGICAL INSTITUTE, Issue 3 2009Kristina Wirtz Using a semiotic framework to examine different categorizations of ritually produced ,hazardous waste' in Cuban popular religions, I argue that the ways in which waste is produced and treated generate its social indexical value and its potential to act on people. I suggest a focus on the interactions between the materiality of ritual waste and its circulation as an object of discourse. In this view, subjectification and objectification processes are shown to be related, and the agency of subjects and objects is constituted within what Webb Keane calls the same ,representational economy'. Ethnographically, I describe two different but overlapping explanatory frameworks in how religious practitioners and the Cuban state construe the dangers of ritual waste: a religious framework in which certain kinds of waste are spiritually charged, and an epidemiological framework based on long-standing metaphors of racialized contagion. Résumé À partir de l'analyse, dans un cadre sémiotique, de différentes catégorisations de « déchets dangereux » produits par les rituels des religions populaires cubaines, l'auteure avance que la manière dont les déchets sont produits et traités génère leur valeur indexique sociale et leur capacité d'agir sur les gens. Elle suggère de se concentrer sur les interactions entre la matérialité des déchets rituels et leur circulation en tant qu'objet de discours. Selon cette approche, il apparaît que les processus de subjectification et d'objectification sont liés et que l'agencéité des sujets et des objets est constituée dans le cadre d'une même «économie représentationnelle », selon l'expression de Webb Keane. Du point de vue ethnographique, l'auteure décrit deux cadres différents, mais qui se recoupent, pour expliquer la manière dont les praticiens religieux et l'État cubain envisagent les dangers des déchets rituels : un cadre religieux dans lequel certains types de déchets portent une charge spirituelle, et un cadre épidémiologique, basé sur d'anciennes métaphores de contagion racialisée. [source] Bioconcentrations of metals (Fe, Cu, Zn, Pb) in earthworms (Eisenia fetida), inoculated in municipal sewage sludge: Do earthworms pose a possible risk of terrestrial food chain contamination?ENVIRONMENTAL TOXICOLOGY, Issue 1 2009Surindra Suthar Abstract Efforts have been made to evaluate the possible risks of metal bioaccumulation in composting earthworms during vermicomposting of hazardous wastes, e.g., sewage sludge. The sewage sludge was diluted by mixing cow dung in different proportions, and vermicomposted sludge as well as inoculated earthworms were analyzed for metal (Fe, Cu, Zn, Pb) contents. The sludge processed by worms showed a significant reduction in concentration of metals, Cu (29.4,51.6%), Fe (13.1,19.9%), Zn (15.2,25.8%), and Pb (4.6,46.9%), at the end. A considerable concentration of metals, total Cu (16.7,27.6 mg kg,1), total Fe (42.9,89.8 mg kg,1), total Zn (5.85,75.0 mg kg,1), and total Pb (1.79,12.4 mg kg,1), in composting earthworms was also recorded. The greater values of bioconcentration factors for metals suggested the possible risk of entering contaminants in higher food chains; since, earthworms are near to the terrestrial food chain, they can potentially mediate metal transfer from soil to a range of predators, including birds. Therefore, feasibility of vermitechnology in hazardous waste recycling needs close attention in respect to possible risk of environmental contamination. © 2008 Wiley Periodicals, Inc. Environ Toxicol, 2009. [source] Molecular dynamics and multiscale homogenization analysis of seepage/diffusion problem in bentonite clayINTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 12 2002Y. Ichikawa Abstract A scheme combining a molecular behaviour and macro-continuum phenomenon is presented for bentonite clay, which is a key component of a barrier system for disposal and containment of hazardous wastes. On designing a disposal facility we use a macro-phenomenological model. However the existing model is not sufficiently effective. Bentonite is a microinhomogeneous material. Properties of the saturated bentonite are characterized by montmorillonite and water, called montmorillonite hydrate. Since the crystalline structure of montmorillonite determines the fundamental properties of the montmorillonite hydrate, we analyse its molecular behaviour by applying a molecular dynamics simulation to enquire into the physicochemical properties of the montmorillonite hydrate such as diffusivity of chemical species. For extending the microscopic characteristics of constituent materials to a macroscopic diffusion behaviour of the microinhomogeneous material we apply a multiscale homogenization analysis, especially in order to treat micro-level of adsorption behaviour. Copyright © 2002 John Wiley & Sons, Ltd. [source] From Cradle to Grave: Extended Producer Responsibility for Household Hazardous Wastes in British ColumbiaJOURNAL OF INDUSTRIAL ECOLOGY, Issue 2 2001Ronald J. Driedger Summary Household hazardous wastes (HHWs), the discarded pesticides, solvents, paints, lubricating oil, and similar products common to residences throughout the industrial world, create problems for governments charged with managing solid waste. When disposed of improperly in landfills or incinerators or if dumped illegally, HHW may contribute to soil and water contamination. A most common management tool for HHW is a special collection effort that segregates HHW from normal trash and disposes of it in an approved manner, all at a higher cost to the governmental jurisdiction. The Canadian province of British Columbia (BC) has undertaken a different approach, based on the use of extended producer responsibility (EPR). BC's efforts began in 1992 with adoption of a regulation on used lubricating oil (lube oil). More than 40 million liters (L) of used lube oil have been collected annually through the EPR system established under this regulation. A regulation establishing producer responsibility for postconsumer paints followed in 1994. BC enacted an additional regulation establishing EPR in 1997 for solvents/flammable liquids, domestic pesticides, gasoline, and pharmaceuticals. As a result of the application of EPR to HHW, local government costs for managing HHW and the amount of HHW identified in municipal waste have declined. Although the regulations appear to have mixed success in prompting consumers to avoid products that result in HHW, there are indications that they may be more effective than conventional management efforts. Based on BC's experience with EPR, key factors for successful implementation include maintaining flexibility in program design, creating viable funding alternatives, aggressive enforcement to provide a level playing field, and adopting policies that maximize diversion of HHW from landfills, while minimizing waste generation, setting targets for reuse and recycling, promoting consumer awareness and convenience, involving local government jurisdictions, and monitoring outcomes. [source] Chlorophenol dehalogenation in a magnetically stabilized fluidized bed reactorAICHE JOURNAL, Issue 3 2006Lisa J. Graham Abstract Aromatic halocarbons are often present in contaminated aquifers, surface waters, wastewater streams, soils, and hazardous wastes. The dehalogenation of p-chlorophenol as a model compound in both the aqueous phase and in slurries of contaminated solids using a magnetically stabilized fluidized bed (MSFB) reactor is discussed. Composite palladium-iron (Pd/Fe) media are employed as both catalyst and sacrificial reactant for the reductive dechlorination of p-chlorophenol. Calcium alginate beads impregnated with Pd/Fe granules are fluidized in a recirculating aqueous stream containing either dissolved p-chlorophenol or a slurry of soil contaminated with this chlorocarbon. Magnetic stabilization of the fluidized bed allows substantially higher rates of mass transfer than would otherwise be achievable, and allows circulation of contaminated solids while fluidization media are retained. Anoxic conditions are sustained under a nitrogen purge and the solution pH of 5.8 is maintained by active control to minimize surface fouling by hydroxides, and to minimize mass-transfer resistances resulting from the surface accumulation of hydrogen bubbles. A model of this process is described and the resulting predictions are compared to the experimentally derived data. © 2005 American Institute of Chemical Engineers AIChE J, 2006 [source] Steering through Complexity: EU Environmental Regulation in the International ContextPOLITICAL STUDIES, Issue 1 2002Aynsley Kellow The nature of governance in the European Union (EU) and its member states is continuing to evolve as the EU develops. This paper focuses on the challenges to this governance process in the sector of environmental policy, and particularly the role of external organizations and states in providing alternate policy fora. The policy impact of these institutions and organizations leads to more actor participation in a way that EU players may not be able to anticipate or control since the EU is only one of several arenas involved. Both states and non-governmental actors actively seek to shift issues to arenas that provide them advantages. Consequently, developments in other arenas shape and are shaped by EU issues as actors pursue forum shopping. The paper presents two cases, the amendment of the Basel Convention to ban hazardous wastes export and the EU regulation of chemical risk, which demonstrate how external players can shape EU regulation. [source] HAZARDOUS WASTE DISPOSAL: A WASTE-FUEL BLENDING APPROACHPRODUCTION AND OPERATIONS MANAGEMENT, Issue 3 2003A. DALE FLOWERS The disposal of hazardous wastes creates major economic and environmental problems. One productive use of hazardous wastes is to blend them into fuel, which mitigates damage to the environment by recycling waste into fuel and reducing fossil-fuel consumption. Operations personnel face a daunting task of efficiently blending hazardous waste into fuel, while simultaneously maintaining environmental regulatory requirements. This research develops a goal-programming approach to the waste-fuel-blending process that considers the diverse objectives of fuel managers. A realworld case study at a cement kiln illustrates the effectiveness of this approach, where the implementation followed principles of team building and quality management. [source] The Use of Natural Systems to Remediate Groundwater: Department of Energy Experience at the Savannah River SiteREMEDIATION, Issue 3 2002Gerald C. Blount Natural remediation is moving toward the forefront as engineers clean groundwater at the Savannah River Site (SRS), a major Department of Energy (DOE) installation near Aiken, South Carolina. This article reviews two successful, innovative remediation methods currently being deployed: biosparging to treat chlorinated solvents and phytoremediation to address tritium in groundwater. The biosparging system reintroduces oxygen into the groundwater and injects nutrient compounds for in-situ remediation. The system has greatly reduced the concentrations of trichloroethylene (TCE) and vinyl chloride in wells downgradient from a sanitary landfill (SLF). Phytoremediation is an emerging technology that promises effective and inexpensive cleanup of certain hazardous wastes. Using natural processes, plants can break down, trap and hold, or transpire contaminants. This article discusses the use of phytoremediation to reduce the discharge of tritium to an on-site stream at SRS. © 2002 Wiley Periodicals Inc.* [source] Treatment of Perchlorate-Contaminated Groundwater Using Highly Selective, Regenerable Ion-Exchange Technology: A Pilot-Scale DemonstrationREMEDIATION, Issue 2 2002Baohua Gu Treatment of perchlorate-contaminated groundwater using highly selective, regenerable ion-exchange technology has been recently demonstrated at Edwards Air Force Base, California. At an influent concentration of about 450 ,g/l ClO4,, the bifunctional anion-exchange resin bed treated approximately 40,000 empty bed volumes of groundwater before a significant breakthrough of ClO4, occurred. The presence of relatively high concentrations of chloride and sulfate in site groundwater did not appear to affect the ability of the bifunctional resin to remove ClO4,. The spent resin bed was successfully regenerated using the FeCl3,HCl regeneration technique recently developed at the Oak Ridge National Laboratory, and nearly 100 percent of sorbed ClO4, was displaced or recovered after elution with as little as about two bed volumes of the regenerant solution. In addition, a new methodology was developed to completely destroy ClO4, in the FeCl3,HCl solution so that the disposal of perchlorate-containing hazardous wastes could be eliminated. It is therefore anticipated that these treatment and regeneration technologies may offer an efficient and cost-effective means to remove ClO4, from contaminated groundwater with significantly reduced generation of waste requiring disposal. © 2002 Wiley Periodicals, Inc. [source] | |||||||||||||||||||