Mechanical recycling

Xem 1-17 trên 17 kết quả Mechanical recycling
  • If the 20th century could be characterized by the rapid increase in the production and consumption of materials that helped improving the standards of living, then the 21st certainly has many elements to qualify as the century of recycling. Since the duration of life of a number of wastes is very small (roughly 40% have duration of life smaller than one month), there is a vast waste stream that reaches each year to the final recipients creating a serious environmental problem.

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  • Recycling of plastic materials is now an important field in the plastics industry, not just an activity born under environmental pressure. The recycling processes include industrial operations in which secondary materials are reprocessed and/or monomers recovered for further polymerization; such processes are termed secondary and tertiary recycling.

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  • This section illustrates that MBT systems can be described as two simple concepts: either to separate the waste and then treat; or to treat the waste and then separate. In some systems only biological treatment is required to treat all the residual MSW before disposal to landfill. Whilst a variety of treatment and mechanical separation options are offered, these need to be optimised in terms of the outputs in order to find outlets for the various materials / fuels derived from the process (see Markets for the Outputs section). ...

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  • The nature of the tire and rubber industry has changed over the last 30 to 40 years in that, like all other industries, it has come to recognize the value of using renewable sources of raw materials, recycling materials whenever possible, and examining the potential of reclaiming used materials for fresh applications.

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  • ENVIRONMENTAL CONTAMINATION ANALYSIS AND PREVENTION 18.2 Recycle Profit Potentials in Municipal Wastes 18.2 Choice of Cleanup Technology for Contaminated Waste Sites 18.4 Cleaning Up a Contaminated Waste Site Via Bioremediation 18.10 Process and Effluent Treatment Plant Cost Estimates by Scale-Up Methods

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  • Hexabromobenzene (HBB) has been used as a flame retardant in polymers, plastics, textiles, wood and paper. Its primary uses have been reported in the plastics, paper and electrical industries (Bruchajzer et al., 2004). U.S. production/import volume was listed as 10,000- 500,000 pounds for 1998, but no information is available beyond that time (U.S. EPA, 2002). In addition to its use as a flame retardant, HBB is a thermal decomposition product of octa- and decaBDEs and hexabromobiphenyl (as cited in Bruchajzer et al., 2004).

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  • The bleached pulps were screened prior to sheet preparation. All analyses were performed according to ISO and SCAN standards, except for the carbohydrate analysis of straw which was done by high-performance anion-exchange chromatography (HPAEC). The ashing was conducted at 550°C for 12 h. The mechanically refined pulp after hot water treatment was fractioned with a Bauer McNett apparatus. The paper technical properties were determined from the combined 100 and 200 mesh fractions.

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  • Steel mills that recycle scrap metal face a similar incidental emissions problem. North American automobile manufacturers have used hundreds of thousands of kilograms of mercury in vehicle switches and other applications, such as headlights. Much of this mercury enters the atmosphere when the scrapped cars are melted down to make new steel, while some of it contaminates the ground in the yards where the cars are crushed or shredded. Nearly all of the mercury found in cars enters the environment.

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  • Other materials which may be extracted from MBT processes include glass, textiles, paper / card, and plastics. The most common of these is glass, which may be segregated with other inert materials such as stones and ceramics. These materials are typically segregated and arise as the “dense” fraction from air classifiers or ballistic separation (see Table 2 on mechanical waste preparation technologies). This dense fraction could find application for use as a low grade aggregate; however this would be subject to achieving a suitable quality material.

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  • CCR5 is a G protein-coupled receptor that binds several natural chemokines but it is alsoa coreceptor for the entryof M tropic strains of HIV-1 into cells. Levels of CCR5 on the cell surface are important for the rate ofHIV-1 infectionand are determined by a number of factors including the rates of CCR5 internalization and recycling. Here we investigated the involvement of the actin cytoskeleton in the control of ligand-induced internalization and recycling of CCR5.

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  • Như bạn đã biết, icon là biểu tượng để mở các cửa sổ và làm việc với hệ điều hành, còn shortcut là lối đi tắt để nhanh chóng gọi ra các ứng dụng. Vì vậy cả hai sẽ có những đặc điểm rất khác nhau. Thuộc tính của các icon tùy thuộc vào nhiệm vụ mà nó gánh vác, do vậy giữa các icon với nhau ít có điểm tương đồng về thuộc tính. Bấm nút phải chuột vào icon Recycle Bin, một menu xuất hiện, nhấp chuột chọn Properties để tìm hiểu các thuộc tính của nó thì...

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  • Recyclables derived from the various MBT processes are typically of a lower quality than those derived from a separate household recyclate collection system and therefore have a lower potential for high value markets. The types of materials recovered from MBT processes almost always include metals (ferrous and non-ferrous) and for many systems this is the only recyclate extracted. However these plant can help enhance overall recycling levels and enable recovery of certain constituent items that may not otherwise be collected in household systems (e.g. batteries, steel coat hangers, etc.).

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  • In Alberta, the Environmental Protection and Enhancement Act (EPEA) and associated regulations are the principal legislation (delivery tool) governing the environmental aspects of pulp and paper mill developments. Section 14(4) of the EPEA establishes the authority to develop guidelines and objectives to meet goals and purposes to which environmental protection efforts are directed.

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  • Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS SECTION 18 ENVIRONMENTAL CONTROL AND ENERGY CONSERVATION ENVIRONMENTAL CONTAMINATION ANALYSIS AND PREVENTION 18.2 Recycle Profit Potentials in Municipal Wastes 18.2 Choice of Cleanup Technology for Contaminated Waste Sites 18.4 Cleaning Up a Contaminated Waste Site Via Bioremediation 18.10 Process and Effluent Treatment Plant Cost Estimates by Scale-Up Methods 18.16 Work Required to Clean Oil-Polluted Beaches 18.73 Sizing Explosion Vents for Industrial Structures 18.75 Industrial Building Ventilation for Environmental Safety 18.

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  • Tendons are known to have a profound impact on the overall function of the musculoskeletal system in their role as a structural link and force transmitter between muscle and bone. Their unique viscoelastic response under tension allows efficient use and recycling of stored energy during stretch involved in locomotion, modulating joint position control, and providing protection from muscle injuries through reduction of mechanical oscillation and shock.

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  • Wastes are very process-specific but the key pollutants can be derived from knowledge of: the process, construction materials, corrosion / erosion mechanisms and maintenance materials. Waste audits are used to gather information on the source, composition, quantity and variability of all wastes. Waste prevention typically involves preventing the arising of waste at source, minimising the arisings and recycling any waste that is generated.

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  • Autophagy is an evolutionarily conserved lysosomal pathway used to degrade and recycle long-lived proteins and cytoplasmic organelles. This homeostatic ability makes autophagy an important pro-survival mechanism in response to several stresses, such as nutrient starvation, hypoxia, dam-aged mitochondria, protein aggregation and pathogens.

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