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21.
本文阐述了一种新型二级垂直移动式颗粒层除尘器,它的关键技术采用独创的床外清灰及气流输送、滤料循环系统.该除尘器1991年已获国家实用新型专利,它的适用范围广,除尘效率高,无二次污染。适用于粉尘、烟气等污染源的治理,使排放浓度达标. 相似文献
22.
Characteristics, treatment and utilization of residues from municipal waste incineration 总被引:12,自引:0,他引:12
Beneficial utilization of residues from municipal solid waste incineration is an important objective for integrated waste management in many jurisdictions. When residues are to be used as an aggregate substitute in construction applications, the release of constituents of concern to soils and water through leaching is an important environmental consideration. In this paper, residue characteristics that control constituent leaching and testing approaches for evaluating leaching are discussed. Quality control and potential improvement in case of beneficial application are addressed. 相似文献
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The study has investigated the levels of metal contamination in groundwater due to particulate matter fallout and leaching from ash pond and assigned contamination indices for the adjacent localities around an ash disposal site with application of geographic information systems (GIS). Fe, Ba, Cu, Mn, S, Pb, V, and Zn were found to be the major contaminants in groundwater. Enrichment factors (EF) of these elements with respect to the United States Environmental Protection Agency (USEPA) maximum contaminant levels show high values for Mn, Fe, and Pb in groundwater. The zone of attenuation for Ba, Fe, Cu, Mn, S, and Zn in groundwater is about 600-900 m from the ash pond, while Pb did not show any significant attenuation even at a distance of 1200 m. Tube wells around Rankasingha and Kukurhanga villages are most contaminated whereas open wells of Lachhmanpur, Kaniapada, and Kurudul villages showed higher degrees of contamination. 相似文献
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Brian K. Gullett William P. Linak Abderrahmane Touati Shirley J. Wasson Staci Gatica Charles J. King 《Journal of Material Cycles and Waste Management》2007,9(1):69-79
Air emissions and residual ash samples were collected and analyzed during experiments of open, uncontrolled combustion of
electronic waste (e-waste), simulating practices associated with rudimentary e-waste recycling operations. Circuit boards
and insulated wires were handled separately to simulate processes associated with metal recovery. The average emissions of
polychlorinated dibenzodioxins and dibenzofurans (PCDD/PCDFs) were 92 ng toxic equivalency (TEQ)/kg [n = 2, relative standard deviation (RSD) = 98%] and 11 900 ng TEQ/kg (n = 3, RSD = 50%) of the initial mass of the circuit boards and insulated wire, respectively. The value for the insulated wire
is about 100 times higher than that for backyard barrel burning of domestic waste. The emission concentrations of polybrominated
dibenzodioxins and dibenzofurans (PBDD/PBDFs) from the combustion of circuit boards were 100 times higher than for their polychlorinated
counterparts. Particulate matter (PM) sampling of the fly ash emissions indicated PM emission factors of approximately 15
and 17 g/kg of the initial mass for the circuit boards and insulated wire, respectively. Fly ash samples from both types of
e-waste contained considerable amounts of several metallic elements and halogens; lead concentrations were more than 200 times
the United States regulatory limits for municipal waste combustors and 20 times those for secondary lead smelters. Leaching
tests of the residual bottom ash showed that lead concentrations exceeded U.S. Environmental Protection Agency landfill limits,
designating this ash as a hazardous waste. 相似文献
27.
Due to the consumption of the herby cheese in south eastern Anatolia-Turkey is at high ratio, chemical parameters such as
dry matter, pH, acidity, aCl, protein, fat and trace metal contents in 50 different herby cheeses produced at this region
have been determined in the presented study. The content of lead, copper, cobalt, nickel, chromium, cadmium, and iron have
been analyzed by flame atomic absorption spectrometer in air/acetylene flame after combination ash digestion method and wet
digestion method. The mean concentration of lead, copper, cobalt, nickel, chromium and cadmium in our samples are higher than
literature values except iron. 相似文献
28.
R. Cimdins I. Rozenstrauha L. Berzina J. Bossert M. Bücker 《Resources, Conservation and Recycling》2000,29(4)
Large areas of Latvia are contaminated with industrial waste: metallurgical slag, fly-ash, etching refuse, peat, and coal ash as well as glass waste which often contain dangerous substances. From the environmental point of view this waste should be neutralised. As this waste also contains valuable chemical compounds, it can be considered as a raw material for the generation of new materials. One method of utilisation is to produce recycled materials — street plates, decorative tiles, or floor tiles. Dense sintered glassceramics with a water uptake of 0.34–3.23 wt.%, a final density of 2.93–3.05 g/cm3, and a bending strength of 80–96 MPa have been created from industrial waste. The mast chemically durable glassceramics contained clay additions. Thus, the material containing only waste had a durability (mass loss) of 3.02% in 0.1 N HCl, while the composition containing 30% clay addition had a durability of 0.2% in 0.1 N HCl. 相似文献
29.
Isobel Tomlinson 《环境政策》2016,25(4):709-728
Why did the identification of ash dieback (Chalara Fraxinea) in 2012 in the UK catch the national media, public, and political zeitgeist, and lead to policy changes, in a way that no other contemporary tree pest or pathogen outbreak has? The identification of ash dieback in the UK is conceptualised as a successful ‘focusing event’, and the ways in which it was socially constructed by the media, stakeholders, and the government are analysed. National newspaper coverage contributed to the way that the disease was understood and was significant in driving the political response. Ash dieback’s focal power derived from the perceived scale and nature of its impact, the initial attribution of blame on government, the war-like response from the government, and Ash’s status as a threatened native tree. The ash dieback focusing event has increased the salience of plant health issues amongst policymakers, the public, and conservation organisations in the UK. 相似文献
30.
Leachate from ash landfills is frequently enriched with As and Se but their off-site movement is not well understood. The attenuation potential of As and Se by soils surrounding selected landfills during leachate seepage was investigated in laboratory column studies using simulated ash leachate. As(III, V) and Se(IV, VI) concentrations as well as pH, flow rate, and a tracer were monitored in influent and effluent for up to 800 pore volumes followed by sequential desorption, extraction, and digestion of column segments. Column breakthrough curves (BTCs) were compared to predictions based on previously measured sorption isotherms. Early As(V) breakthrough and retarded As(III) breakthrough relative to predicted BTCs are indicative of oxidative transformation during seepage. For Se(VI), which exhibits linear sorption and the lowest sorption propensity, measured BTCs were predicted fairly well by equilibrium sorption isotherms, except for the early arrival of Se(IV) in one site soil, which in part, may be due to higher column pH values compared to batch isotherms. Most of the As and Se retained by soils during leaching was found to be strongly sorbed (60–90%) or irreversibly bound (10–40%) with <5% readily desorbable. Redox potential favoring transformation to the more sorptive valence states of As(V) and Se(IV) will invoke additional attenuation beyond equilibrium sorption-based predictions. With the exception of Se(IV) on one site soil, results indicate that attenuation by down-gradient soils of As and Se in ash landfill seepage will often be no less than what is predicted by equilibrium sorption capacity with further attenuation expected due to favorable redox transformation processes, thus mitigating contaminant plumes and associated risks. 相似文献