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electronic waste

Jaya Sharma, Kashif Shamim, Santosh Kumar Dubey
Achromobacter xylosoxidans strain SJ11, tolerating up to 4.0 mM lead nitrate, in a defined minimal medium was isolated from the waste of a battery manufacturing industry, Goa, India. Interestingly, it formed white precipitate on exposure to lead nitrate which was also evident from scanning electron micrograph (SEM). Energy dispersive X-ray spectroscopic analysis revealed the presence of lead (48.5% by weight) along with phosphorus and chlorine in the precipitate. Transmission electron microscopy (TEM) of bacterial cells clearly refuted the possibility of intracellular lead uptake confirming extracellular precipitation as a predominant mechanism of lead resistance in this bacterium...
April 12, 2018: Journal of Environmental Management
Yanhong Zeng, Chenchen Huang, Xiaojun Luo, Yine Liu, Zihe Ren, Bixian Mai
The levels of polychlorinated biphenyls (PCBs) and short/median-chain chlorinated paraffins (S/MCCPs) in 68 home-produced eggs collected in 2013 and 2016 from an electronic-waste (e-waste) site in South China were measured and the human dietary exposure to these two classes of contaminants via egg consumption was calculated. The levels of PCBs, SCCPs, and MCCPs varied from 236 to 8870 ng/g lipid weight (lw), 477 to 111,000 ng/g lw, and 125 to 91,100 ng/g lw, respectively. There are no significant differences in the levels of PCBs, SCCPs, and MCCPs between 2013 and 2016 (p > 0...
April 10, 2018: Environment International
Joseph Bennett, Diamond Jones, Xu Huang, Robert J Hamers, Sara E Mason
The rapid increase in use of Li-ion batteries in portable electronics has created a pressing need to understand the environmental impact and long-term fate of electonic waste (e-waste) products such as heavy and/or reactive metals. The type of e-waste that we focus on here are the complex metal oxide nanomaterials that compose Li-ion battery cathodes. While in operation the complex metal oxides are in a hermetically sealed container. However, at the end of life, improper disposal can cause structural transformations such as dissolution and metal leaching, resulting in a significant exposure risk to the surrounding environment...
April 13, 2018: Environmental Science & Technology
José Manuel Salgado, Daniel Sousa, Armando Venâncio, Isabel Belo
BACKGROUND: Mediterranean agro-food industries, among which are wineries, breweries and olive mills, dispose a great amount of wastes, which generate environmental problems and have a low nutritional value to be used as animal feed. In this sense, solid-state fermentation (SSF) can increase the nutritional value of these wastes and simultaneously produce lignocellulolytic enzymes. RESULTS: All fermented wastes were enriched in protein by the three fungi studied...
April 13, 2018: Journal of the Science of Food and Agriculture
Corine Orline Nzeteu, Anna Christine Trego, Florence Abram, Vincent O'Flaherty
Background: Nowadays, the vast majority of chemicals are either synthesised from fossil fuels or are extracted from agricultural commodities. However, these production approaches are not environmentally and economically sustainable, as they result in the emission of greenhouse gases and they may also compete with food production. Because of the global agreement to reduce greenhouse gas emissions, there is an urgent interest in developing alternative sustainable sources of chemicals. In recent years, organic waste streams have been investigated as attractive and sustainable feedstock alternatives...
2018: Biotechnology for Biofuels
Yanan Du, Yan Wang, Liqing Du, Chang Xu, Kaihua Ji, Jinhan Wang, Qiang Liu
No abstract text is available yet for this article.
March 2018: Environment International
Xiaodong Tang, Wanqing Wu, Wei Zeng, Huanfeng Jiang
Selective oxidation, a fundamental organic transformation of critical importance, produces value-added products from simple organic molecules. This process is extensively used to incorporate heteroatoms into carbon-based molecules, where high-valent metal salts, hypervalent halogen reagents, and peroxides are widely used as oxidants. Oxidation reactions are extremely challenging because their selectivity is hard to control and/or they form significant quantities of unwanted waste derived from the stoichiometric oxidants...
April 12, 2018: Accounts of Chemical Research
Yan Yang, Yaqian Zhao, Ranbin Liu, David Morgan
Substrate selection is one of the key technical issues for constructed wetlands (CWs), which works for wastewater treatment based mainly on the biofilm principle. In recent years, many alternative substrates have been studied and applied in CWs, and a review is conducive to providing updated information on CW R&D. Based on the intensive research work especially over the last 10 years on the development of emerged substrates (except for the three conventional substrates of soil, sand, and gravel) in CWs, this review was made...
March 29, 2018: Bioresource Technology
Agnieszka Gurgul, Włodzimierz Szczepaniak, Monika Zabłocka-Malicka
Constructional complexity of items and their integration are the most distinctive features of electronic wastes. These wastes consist of mineral and polymeric materials and have high content of valuable metals that could be recovered. Elimination of polymeric components (especially epoxy resins) while leaving non-volatile mineral and metallic phases is the purpose of thermal treatment of electronic wastes. In the case of gasification, gaseous product of the process may be, after cleaning, used for energy recovery or chemical synthesis...
May 15, 2018: Science of the Total Environment
Caio Henrique Nasi de Barros, Guilherme Crispim Faria Cruz, Willian Mayrink, Ljubica Tasic
Purpose: Despite the numerous reports on biological syntheses of silver nanoparticles (AgNPs), little is known about the composition of their capping agents, protein corona of plant extract-mediated synthesis, and their influence on the properties of AgNPs. Here, orange ( Citrus sinensis ) waste was utilized as a source of an extract for AgNP synthesis (the protein corona composition of which was elucidated), and also as a starting material for hesperidin and nanocellulose extraction, which were used for bio-based AgNP synthesis...
2018: Nanotechnology, Science and Applications
Sapna Mishra, B R Shamanna, Srinivasan Kannan
Introduction: Occupational Health hazards of handling and management of electronic waste is a nascent subject. Improper and unscientific handling of e-waste can invite significant human and environmental health risks. Objective: To study the level of awareness about electronic waste and its health hazards amongst informal handlers in Musheerabad, Hyderabad. Methodology: Ethical approval and informed consents were obtained from Institutional Ethical Committee, University of Hyderabad and from the participants respectively before the commencement of study...
September 2017: Indian Journal of Occupational and Environmental Medicine
Muhammad Kashif Shahid, San Phearom, Young-Gyun Choi
The magnetite particles were chemically synthesized from the waste of hot rolling steel industry. The characterization of the synthesized magnetite was done by using Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), Energy Dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The synthesized magnetite particles were used for the adsorptive removal of arsenate from the contaminated water. The maximum adsorption capacity of 7.69 mg was found on the surface of 1 g of the magnetite...
March 23, 2018: Chemosphere
Valentina Innocenzi, Francesco Tortora, Marina Prisciandaro, Ida De Michelis, Francesco Vegliò, Giuseppe Mazziotti di Celso
Hydrometallurgical processes for the treatment and recovery of metals from waste electrical and electronic equipment produce wastewaters containing heavy metals. These residual solutions cannot be discharged into the sewer without an appropriate treatment. Specific wastewater treatments integrated with the hydrometallurgical processes ensure a sustainable recycling loops of the electrical wastes to maximize the metals recovery and minimize the amount of wastes and wastewaters produced. In this research activity the efficiency of ultrafiltration combined with surfactant micelles (micellar-enhanced ultrafiltration) was tested to remove metals form leach liquors obtained after leaching of NiMH spent batteries...
March 27, 2018: Journal of Environmental Management
Eman Alzahrani
Fast Green (FCF) dye is commonly used in both cytology and histology applications. Previous studies have found that it can cause mutagenic and tumorigenic effects in experimental human and animal populations. It can also be a source of skin, eye, respiratory, and digestive irritation. The purpose of this study was to examine the use of thin film membranes to degrade FCF. A thin film membrane of chitosan (CS) was fabricated and subsequently filled with zinc oxide nanoparticles (ZnO) or ZnO/CuO-heterostructured nanocomposites...
2018: Analytical Chemistry Insights
Xue Zhang, Hengxiang Li, Qing Cao, Li'e Jin, Fumeng Wang
The managing and recycling of waste tires has become a worldwide environmental challenge. Among the different disposal methods for waste tires, pyrolysis is regarded as a promising route. How to effectively enhance the added value of pyrolytic residue (PR) from waste tires is a matter of great concern. In this study, the PRs were treated with hydrochloric and hydrofluoric acids in turn under ultrasonic waves. The removal efficiency for the ash and sulfur was investigated. The pyrolytic carbon black (PCB) obtained after treating PR with acids was analyzed by X-ray fluorescence spectrophotometry, Fourier transform infrared spectrometry, X-ray diffractometry, laser Raman spectrometry, scanning electron microscopy, thermogravimetric (TG) analysis, and physisorption apparatus...
March 1, 2018: Waste Management & Research
Stephanie M Andler, Julie M Goddard
Candida antarctica lipase B is stabilized in a porous, high internal phase emulsion (HIPE) of polydicyclopentadiene to enable biocatalytic waste stream upcycling. The immobilized lipase is subjected to thorough washing conditions and tested for stability in extreme environments and reusability. A porous internal microstructure is revealed through scanning electron microscopy. After preparation, lipase activity increased to 139±9.7% of its original activity. After ten cycles of reuse, immobilized lipase retains over 50% activity...
March 27, 2018: Journal of Agricultural and Food Chemistry
J A Torres, M C Silva, J H Lopes, A E Nogueira, F G E Nogueira, A D Corrêa
In this work we synthesized an activated carbon/magnetite composite by a simple co-precipitation method. The activated carbon was synthesized from the solid waste obtained in the extraction process of the peroxidase enzyme and the magnetic composite was used as support for the immobilization of soybean peroxidase (SP). After the determination of the optimal immobilization parameters, a yield of 100% was achieved under the following conditions: proportion support: enzyme of 1.0:0.05 g, equilibration time of 7 h, pH 3...
March 22, 2018: International Journal of Biological Macromolecules
Ming-Chen Xia, Peng Bao, A-Juan Liu, Shi-Shi Zhang, Tang-Jian Peng, Li Shen, Run-Lan Yu, Xue-Ling Wu, Jiao-Kun Li, Yuan-Dong Liu, Miao Chen, Guan-Zhou Qiu, Wei-Min Zeng
Biohydrometallurgy is generally considered as a green technology for the recycling of industrial solid waste. In this study, an indigenous fungal strain named Y5 with the ability of high-yielding organic acids was isolated and applied in bioleaching of waste printed circuit boards (PCBs). The strain Y5 was identified as Penicillium chrysogenum by morphological and molecular identification. Meanwhile, we investigated that an optimal set of culturing conditions for the fungal growth and acids secretion was 15 g/L glucose with initial pH 5...
March 21, 2018: Journal of Bioscience and Bioengineering
John Watt, Mariah J Austin, Chester K Simocko, Douglas V Pete, Jonathan Chavez, Lauren M Ammerman, Dale L Huber
A method for creating nanoparticles directly from bulk metal by applying ultrasound to the surface in the presence of a two-part surfactant system is presented. Implosive collapse of cavitation bubbles near the bulk metal surface generates powerful microjets, leading to material ejection. This liberated material is captured and stabilized by a surfactant bilayer in the form of nanoparticles. The method is characterized in detail using gold, but is also demonstrated on other metals and alloys, and is generally applicable...
March 24, 2018: Small
Chimere May Ohajinwa, Peter M van Bodegom, Martina G Vijver, Willie J G M Peijnenburg
Electronic and electrical equipment contains over 1000 different substances, including metals. During informal e-waste recycling some of these substances such as metals, are released into the environment causing environmental pollution. This study assessed the impact of different informal e-waste recycling activities (burning, dismantling, and repairing) on metal concentrations in top soils and various dust. A comparative cross-sectional study design was adopted to assess metal concentrations in top soils and in various dust samples from multiple e-waste recycling sites...
March 20, 2018: Environmental Research
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