Xem 1-19 trên 19 kết quả Liquid pollutants
  • Analysis and abatement of air pollution involve a variety of technical disciplines. Formation of the most prevalent pollutants occurs during the combustion process, a tightly coupled system involving fluid flow, mass and energy transport, and chemical kinetics. Its complexity is exemplified by the fact that, in many respects, the simplest hydrocarbon combustion, the methane-oxygen flame, has been quantitatively modeled only within the last several years.

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  • This volume covers the technologies that are applied to the treatment and purification of water. Those who are generally familiar with this field will immediately embrace the subject as a treatise on solid-liquid separations. However, the subject is much broader, in that the technologies discussed are not just restricted to pollution control hardware that rely only upon physical methods of treating and purifymg wastewaters.

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  • Polychlorinated biphenyls (PCBs) are a family of chemical compounds which do not exist in nature but which are manmade. Commercial mixtures are clear, pale yellow liquids manufactured by the replacement of hydrogen atoms on the biphenyl molecule by chlorine. The reaction is controlled according to the percentage replacement of hydrogen and results in a product which contain chlorobiphenyls with one or, more usually, several chlorine atoms attached to each molecule.

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  • Sự hấp thu cho HAP và VOC kiểm soát Hấp thụ một khối lượng chuyển diffusional hoạt động mà theo đó một thành phần hòa tan khí được lấy ra từ một dòng khí bằng cách giải thể trong một dung môi liquid.1 động lực cho chuyển khối lượng là sự khác biệt nồng độ chất tan giữa các giai đoạn khí và chất lỏng.

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  • This book is planned to publish with an objective to provide a state-of-art reference book in the area of computational fluid dynamics for CFD engineers, scientists, applied physicists and post-graduate students. Also the aim of the book is the continuous and timely dissemination of new and innovative CFD research and developments. This reference book is a collection of 14 chapters characterized in 4 parts: modern principles of CFD, CFD in physics, industrial and in castle.

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  • Pollution control policy is fundamental for our analysis. In 1982 the central government imposed a system of levies on air pollutants, on total wastewater, and on the concentrations of three pollutants contained in wastewater: total suspended solids, chemical oxygen demand, and other solids. The first two are characteristic of the paper industry. The levy rates were reassessed in 1989 and increased in 1992. Wang et al. (1996) examined the effect of these charges on the effluents on the general manufacturing sector. They found the expected emission-reducing effect.

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  • Liquid waste from Nong Son uranium ore processing is treated with concentrated acid, agglomerated, leached, run through ion exchange and then treated with H2O2 to precipitate yellowcake. The liquid radioactive waste has a pH of 1.86 and a high content of radioactive elements, such as: [U] = 143.898 ppm and [Th] = 7.967 ppm. In addition, this waste contains many polluted chemical elements with high content, such as arsenic, mercury, aluminum, iron, zinc, magnesium, manganese and nickel. The application of the triditional method as one stage...

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  • Benzene is a colourless, liquid, flammable, aromatic hydrocarbon that is a component of petrol, or may result from incomplete combustion of fuels. Benzene, a natural component of crude oil, is emitted from a range of industrial and combustion sources. The major source of benzene is motor vehicles—both vehicle exhaust (contributing approximately 75% to 80% of emissions) and evaporative emissions (including evaporation losses from motor vehicles and evaporation losses during the handling, distribution and storage of petrol).

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  • In contrast, the smaller or so-called "fine" particles in the urban aerosol come from combustion sources, such as power plants, automobile, truck, bus and other vehicle exhaust or from the reactions that transform some of the pollutant gases into solid or liquid particles. These distinctions may be important because the current air pollution health effects literature suggests, although not with certainty, that for some key health effects the fine particles are more important than the coarse particles. These findings have led EPA to propose a new nationwide PM2.

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  • Areas with high concentrations of air-borne particulate matter are more likely to experience fogs, because these particles are preferred nucleation sites for water droplets. Smoke and soot are also very undesirable aesthetically. Soot is formed during combustion when the supply of oxygen is insufficient for complete conversion of carbon to carbon oxides. Its formation is mainly a problem in the combustion of liquid and solid fuels (oil, coal, or wood), because molecular-scale mixing of fuel and oxygen is not as easy here as it is in the combustion of natural gas (see below).

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  • In 1972, the Clean Water Act (CWA) delineated the basic structure for regulating discharges of pollutants into waters and for establishing quality standards for surface waters under the authority of EPA [10]. Under the CWA’s National Pollutant Discharge Elimination System program, stormwater permits were required for sediment runoff from construction sites and discharges of pollutants into surface waters [11]. The permitting system requires adoption of technology-based and water quality-based effluent limits [11,12].

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  • The general review of influence of the pollutants on polymers has been presented by Jellinek et al. [1]. Therein the characterization of reactivity of polymeric materials toward aggressive gases is given. The various polymers were used as films of 20 μ thickness. The thickness is enough small to exclude in most cases the diffusion as the determining factor of the pollutant action. The films were investigated under different conditions: 1) the pollutant action; 2) the oxygen action; 3) UV light action; 4) UV light and oxygen; 5) UV light, oxygen and pollutants.

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  • Transportation involves the combustion of fossil fuels to produce energy translated into motion. Pollution is created from incomplete carbon reactions, unburned hydrocarbons or other elements present in the fuel or air during combustion. These processes produce pollutants of various species, including carbon monoxide, soot, various gaseous and liquid vapour hydro carbons, oxides of sulphur and nitrogen, sulphate and nitrate particulates, ash and lead.

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  • Much new material has been added to this second edition. Besides a totally new chapter on radionuclides, the text has been reorganized and updated with separate chapters on metals, light nonaqueous phase liquids (LNAPLs), dense nonaqueous phase liquids (DNAPLs), and biodegradation. Also, some end-of-chapter exercises have been added. The dictionary of inorganic pollutants has been enlarged and some important organic pollutants added.

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  • Wet processing of textiles uses large quantities of water, and electrical and thermal energy. Most of these processes involve the use of chemicals as assisting, accelerating or retarding their rates and are carried out at elevated temperatures to transfer mass from processing liquid medium across the surface of textile material in a reasonable time. So, we can use some natural materials and some physical tools to reduce the chemicals, water, energy and pollution.

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  • Environmental engineering is the application of science and engineering principles to protect and utilise natural resources, control environmental pollution, improve environmental quality to enable healthy ecosystems and comfortable habitation of humans. It is based on multiple disciplines including geology, hydrology, biology, chemistry, physics, medicine, engineering, management, economics, law, etc.

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  • PART 4 ENERGY, POWER, AND POLLUTION CONTROL TECHNOLOGY p H o U 3 ; I £ 5 D 2 " 0 GO 2 H o rn £ f| |* ?f!5 Ssfcp "Hlr F | | | s^l.^ | "I a 5 co 1 I TABLE 39.1 TABLE 39.2 CONVERSION FACTORS TABLE 39.9 1247 PHASE TRANSITION DATA FOR THE ELEMENTS 1247 PHASE TRANSITION DATA FOR COMPOUNDS 1249 THERMODYNAMIC PROPERTIES OF SATURATED MERCURY 1259 TABLE 39.3 FIGURE 39.2 ENTHALPY-LOG PRESSURE DIAGRAM FOR MERCURY TABLE 39.10 TABLE 3 . THERMODYNAMIC 94 PROPERTIES OF LIQUID AND SATURATED VAPOR AIR 1251 TABLE 39.

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  • In the Northeast, the solvents emitted in the greatest quantities from furniture finishing are toluene, xylenes, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK) and methanol. 3 All of these compounds are flammable liquids that quickly evaporate in air. In addition, the U.S. EPA considers them hazardous air pollutants (HAPs) that can cause adverse health effects and volatile organic compounds (VOCs) that can contribute to ambient air quality problems.

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  • Incineration of other wastes is expensive and leaves a huge residue and adds to air pollution. Pyrolysis is a process of combustion in absence of oxygen or the material burnt under controlled atmosphere of oxygen. It is an alternative to incineration. The gas and liquid thus obtained can be used as fuels. Pyrolysis of carbonaceous wastes like firewood, coconut, palm waste, corn combs, cashew shell, rice husk paddy straw and saw dust, yields charcoal along with products like tar, methyl alcohol, acetic acid, acetone and a fuel gas....

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