Environmental emission analysis of a waste printed circuit board-derived adsorbent production process

Ning, Chao; Hadi, Pejman; Aghdam, Ehsan; Zhu, Shangqian; Hui, David Chi-Wai; Lin, Carol Sze Ki; McKay, Gordon

doi:10.1016/j.cej.2017.05.181

Cited by 22 publications

(9 citation statements)

References 61 publications

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“…Such treatments may contribute to reduce the environmental impacts caused by the extraction of high-valued materials as well as to eliminate the discharge of highly toxic materials from nature. As generally seen in WPCB, the content of some metals may surpass the typical values found in their respective ores [1][2] . More efficient routes normally include mechanical processing of WPCB with the first phase aiming to reduce the volume of material to be treated, however effluents and residues can be generated thus requiring adequate environmental conditioning.…”

Section: Introductionmentioning

confidence: 68%

“…Their disposal as open-pit waste, incineration and/ or landfill generates hazardous by-products and gaseous emissions, which impacts the environment, human health and the sustainable economy. The core part of WEEE constitute the waste printed circuit board (WPCB), which stands out as one of the most difficult component to treat and most valuable part to recycle [1][2] . They contain approximately 23% of polymers, 38% of metals, and 49% of ceramic materials, however, such composition change considerably depending on the electronic device type, model, year of fabrication, etc [3][4] .…”

Section: Introductionmentioning

confidence: 99%

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Enrichment of Copper, Lead, and Tin by Mechanical Dry Processing of Obsolete Printed Circuit Board Residues

2019

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Waste printed circuit boards (WPCB) residues were mechanically processed to concentrate their metal content aiming to reduce costs of the subsequent recovery of copper, tin, and lead. A fully dry route was proposed to avoid the generation of liquid effluents that would require additional treatment. Firstly, 10.7% of the residue was segregated by magnetic separation; the remaining nonmagnetic fraction was comminuted and sieved. Ceramic and polymer materials (1/3 of the total weight) concentrated in the finer and the coarser size fractions, while metallic materials (2/3 of the total weight) concentrated in the intermediate size fraction (90.7, 94.5, and 95.6% of the total copper, tin, and lead contained in the milled WPCB, respectively). The fractions between 0.3-1.20 mm were submitted to gravity separation using a zigzag air classifier; enrichment of copper (from 43±11% to 68±5%), tin (from 10±3% to 17±1%), and lead (from 4±1% to 6.4±0.5%) were obtained.

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Enrichment of Copper, Lead, and Tin by Mechanical Dry Processing of Obsolete Printed Circuit Board Residues

2019

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“…In the past decades, a tremendous amount of waste electrical and electronic equipment (WEEE) have been generated due to great market demands and technology innovation on day‐to‐day basis . The annual production of WEEE approximates 50 million tons with a growth rate of 5% per year .…”

Section: Introductionmentioning

confidence: 99%

“…Printed circuit boards (PCBs) account for 3 wt % of total WEEE. Environmental challenge caused by waste PCBs has been a topic of worldwide concern due to hazardous substances including heavy metals (HMs), brominated flame retardant (BFR), and polyvinyl chloride (PVC) plastic . Incineration produces toxic emissions such as furans, dioxins, polybrominated organic pollutants, polycyclic aromatic hydrocarbons, and bottom ash containing HMs .…”

Section: Introductionmentioning

confidence: 99%

Copper/carbon composites from waste printed circuit boards as catalysts for Fenton‐like degradation of Acid Orange 7 enhanced by ultrasound

et al. 2019

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A novel strategy of “waste treating waste” has been implemented in this work. Copper/carbon (Cu/C) composites prepared by the carbonization of waste printed circuit boards (PCBs) were used for the degradation of Acid Orange 7 (AO7). Catalytic degradation of AO7 was conducted by varying carbonization temperatures, catalyst dosage, H2O2 dosage, AO7 concentration, pH values, and anions. Ultrasound significantly improved AO7 degradation, obtaining 93.27% degradation within 90 min. We report that Cu/C composites show good catalytic activity in a broad pH range. Cu/C catalysts were characterized by multitechniques. Cu0 was the main active component for the generation of •OH that was the reactive oxidant for AO7 degradation. The plausible pathway and catalytic mechanism for AO7 degradation were proposed. The unique structure of Cu/C composites gave a combined mechanism of adsorption and catalysis. Cu/C composites showed superior durability for AO7 degradation. Using Cu/C composites as catalysts provides a green approach for wastewater treatment and waste management. © 2019 American Institute of Chemical Engineers AIChE J, 65: 1234–1244, 2019

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“…1,2) Since PCBA does not only consist of valuable metals but toxic metals as well, there have been many related studies conducted due to its environmental concern even though PCBA only accounts to 3% of the entire e-waste. 3,4) PCBA is an electronic module populated with electronic components on printed circuit board (PCB). 5) The PCB is mainly composed of glass-reinforced epoxy laminate sheets (FR-4) and high grade Cu.…”

Section: Introductionmentioning

confidence: 99%

Liberation Characteristics Assessment for Copper Component in PCB Comminution Product by Image Analysis

et al. 2018

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Cu is one of the most valuable metals found in waste printed circuit boards (PCBs). In order to recover the metals from the e-waste, PCB recycling process exploiting physical concentration techniques have widely been applied. Size reduction steps including crushing and grinding are done for liberation of Cu from the non-metallic materials such as glass fiber and epoxy resin. Degree of liberation is an important factor by which liberation performance of comminution process is evaluated. The primary purpose of this study was to investigate liberation characteristics of Cu particles in comminuted PCB by using image analysis method. The analysis procedures include image processing such as noise reduction, edge detection and component discrimination so that a set of images of ground PCB particles provides quantitative information such as Cu grade distribution and degree of Cu liberation. The Cu liberation phenomenon was also discussed in terms of its disassociation behavior from non-metallic material and grindability difference.

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Environmental emission analysis of a waste printed circuit board-derived adsorbent production process

Cited by 22 publications

References 61 publications

Enrichment of Copper, Lead, and Tin by Mechanical Dry Processing of Obsolete Printed Circuit Board Residues

Enrichment of Copper, Lead, and Tin by Mechanical Dry Processing of Obsolete Printed Circuit Board Residues

Copper/carbon composites from waste printed circuit boards as catalysts for Fenton‐like degradation of Acid Orange 7 enhanced by ultrasound

Liberation Characteristics Assessment for Copper Component in PCB Comminution Product by Image Analysis

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