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    Hazardous and Nonhazardous Waste. Hazardous and nonhazardous wastes are residuals resulting from the manufacture of computers. Printed circuit board production results in the greatest. amount of hazardous waste among the four manufacturing processes evaluated in this study. SOURCE Microelectronics and Computer Technology Corporation (1993).

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    The on-board hex switch can also be removed to reduce cost and the number of general-purpose inputs/outputs (GPIOs), using instead, a full software implementation for node addressing. Both setups use the EVAL-CN0416-ARDZ circuit evaluation board, the ADALM-UARTJTAG programming board, and the EVAL-ADICUP3029.

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     · In the case of this RF-controlled switch, there are two a 25 V Zener used to activate the relay, and a 5 V Zener that supplies the IC and radio circuitry. This is a handy feature of the TPS circuit.

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     · The raw waste (copper sludge) was obtained from the industrial wastewater treatment process of a circuit board printing factory in Hong Kong. The plant utilized a sodium hydroxide precipitation and sedimentation process followed by a filter

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     · The waste printed circuit boards used in the experiment were obtained from a circuit board recycling factory in Shanghai. The main chemical composition of the waste printed circuit boards is presented in Supplementary Table S-I the chemical composition included 25.83 wt.% Cu, 5.73 wt.% Al, 39.99 wt.% SiO 2 , 14.49 wt.% CaO, and other associated metal elements.

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     · Waste will become the major resource in the future circular economy. In particular, E-waste is a major sector growing at an annual rate of about 2 million tonnes (Mt) with rising users of electrical and electronic items worldwide. This is a consequence of versatility and affordability of technological innovation, thus resulting in massive sales and e-waste increases.

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     · In view of the current problems of energy waste in China’s office lighting, lack of intelligent lighting control and single adjustment mode, based on the domestic intelligent control system, development status, current stage technology, etc., this paper proposes to adopt arduino as the main controller, combine with the infrared inductive sensor and the light sensor, the wifi network is used

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     · Chromobacterium violaceum, a cyanide-generating bacterium has been used to leach out gold from the waste printed circuit boards in culture medium with yeast extract, peptone and glycine. And gold leaching efficiency is affected by many factors, such as dissolved oxygen, base metals, particle size and nutriment, especially several metal ions, which can serve as the catalyst in the metabolism.

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  • Waste Printed Circuit Board (PCB) Recycling Techniques

     · The highest recovery rate (98.37%) was obtained with the condition of pH value 1.56, elemental sulfur S 0 5.44 g/l and 16.88 g/l FeSO 4 ·7H 2 O concentration. However, the increase of WPCB addition in culture from 18 to 32.4 g/l will cause a sharp drop in

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  • Hazardous substances in indoor dust emitted from waste TV

     · Various hazardous substances contained in waste TV sets might be released into environment via dust during recycling activities. Two brominated flame retardants (BFRs), polybrominated diphenyl ethers (PBDEs), and tetrabromobisphenol A (TBBPA), and five kinds of heavy metals (Cu, Pb, Cd, Cr, and Ni) were detected in indoor dust collected from two workshops (TV dismantling workshop

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