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https://www.readbyqxmd.com/read/27917929/adsorption-of-methylene-blue-on-an-agro-waste-oiltea-shell-with-and-without-fungal-treatment
#1
Jiayang Liu, Enzhong Li, Xiaojuan You, Changwei Hu, Qingguo Huang
A lignocellulosic waste oiltea shell (OTS) was evaluated as an inexpensive sorbent to remove methylene blue (MB) from aqueous solution. Fungal treatment of OTS increased the MB adsorption by modifying the physicochemical properties of OTS and simultaneously produced laccase as a beneficial co-product. Without fungal treatment, the maximum amount of adsorption (qm) of MB by OTS was 64.4 mg/g, whereas the treatment with fungus Pycnoporus sp. and Trametes versicolor increased qm up to 72.5 mg/g and 85.7 mg/g, respectively...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27917357/enhancing-rock-phosphate-integration-rate-for-fast-bio-transformation-of-cow-dung-waste-paper-mixtures-to-organic-fertilizer
#2
F O Unuofin, M Siswana, E N Cishe
Rock phosphate (RP) addition in cow-dung waste-paper mixtures at rates above 2% P has been reported to increase the rate of bio-transformation and humification of organic waste mixtures during vermicomposting to produce organic fertilizer for organic farming. However, the optimization of RP for vermicomposting was not established. The objective of this study was to determine the optimal amount of RP integration rates for effective bio-transformation of cow-dung waste-paper mixtures. Arrays of RP integration degrees (0, 0...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27916914/comparing-sanitation-delivery-modalities-in-urban-informal-settlement-schools-a-randomized-trial-in-nairobi-kenya
#3
Kate Bohnert, Anna N Chard, Alex Mwaki, Amy E Kirby, Richard Muga, Corey L Nagel, Evan A Thomas, Matthew C Freeman
The provision of safely managed sanitation in informal settlements is a challenge, especially in schools that require durable, clean, sex-segregated facilities for a large number of children. In informal settlements in Nairobi, school sanitation facilities demand considerable capital costs, yet are prone to breakage and often unhygienic. The private sector may be able to provide quality facilities and services to schools at lower costs as an alternative to the sanitation that is traditionally provided by the government...
November 30, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27916494/a-novel-solid-digestate-derived-biochar-cu-np-composite-activating-h2o2-system-for-simultaneous-adsorption-and-degradation-of-tetracycline
#4
Dun Fu, Zheng Chen, Dong Xia, Liang Shen, Yuanpeng Wang, Qingbiao Li
Solid digestate, a by-product of anaerobic digestion systems, has led to a range of environmental issues. In the present study, a novel composite based on a solid digestate-biochar-Cu NP composite was synthesized for tetracycline removal from an aqueous medium. The removal efficiency values for tetracycline (200 mg L(-1)) were 31.5% and 97.8%, respectively, by the biochar-Cu NP composite (0.5 g L(-1)) in the absence and presence of hydrogen peroxide (H2O2, 20 mM) within 6 h of reaction time. The possible degradation pathway of tetracycline was investigated using liquid chromatography-mass spectrometry...
December 1, 2016: Environmental Pollution
https://www.readbyqxmd.com/read/27913910/a-randomized-trial-of-displaying-paid-price-information-on-imaging-study-and-procedure-ordering-rates
#5
Alyna T Chien, Lisa Soleymani Lehmann, Laura A Hatfield, Kate E Koplan, Carter R Petty, Anna D Sinaiko, Meredith B Rosenthal, Thomas D Sequist
BACKGROUND: Prior studies have demonstrated how price transparency lowers the test-ordering rates of trainees in hospitals, and physician-targeted price transparency efforts have been viewed as a promising cost-controlling strategy. OBJECTIVE: To examine the effect of displaying paid-price information on test-ordering rates for common imaging studies and procedures within an accountable care organization (ACO). DESIGN: Block randomized controlled trial for 1 year...
December 2, 2016: Journal of General Internal Medicine
https://www.readbyqxmd.com/read/27913169/liquid-nitrogen-pretreatment-of-eucalyptus-sawdust-and-rice-hull-for-enhanced-enzymatic-saccharification
#6
Rafael Castoldi, Vanesa G Correa, Gutierrez Rodrigues de Morais, Cristina G M de Souza, Adelar Bracht, Rosely A Peralta, Regina F Peralta-Muniz Moreira, Rosane M Peralta
In this work, liquid nitrogen was used for the first time in the pretreatment of plant biomasses for purposes of enzymatic saccharification. After treatment (cryocrushing), the initial rates of the enzymatic hydrolysis of eucalyptus sawdust and rice hull were increased more than ten-fold. Cryocrushing did not modify significantly the contents of cellulose, hemicellulose and lignin in both eucalyptus sawdust and rice hulls. However, substantial disorganization of the lignocellulosic materials in consequence of the pretreatment could be observed by electron microscopy...
November 25, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27912989/assessment-of-methane-production-from-shredder-waste-in-landfills-the-influence-of-temperature-moisture-and-metals
#7
Ehsan Fathi Aghdam, Charlotte Scheutz, Peter Kjeldsen
In this study, methane (CH4) production rates from shredder waste (SW) were determined by incubation of waste samples over a period of 230days under different operating conditions, and first-order decay kinetic constants (k-values) were calculated. SW and sterilized SW were incubated under different temperatures (20-25°C, 37°C, and 55°C), moisture contents (35% and 75% w/w) and amounts of inoculum (5% and 30% of the samples wet weight). The biochemical methane potential (BMP) from different types of SW (fresh, old and sieved) was determined and compared...
November 29, 2016: Waste Management
https://www.readbyqxmd.com/read/27912120/solvothermal-synthesis-of-ag-hybrid-bipo4-heterostructures-with-enhanced-photodegradation-activity-and-stability
#8
Chang-Wei Huang, Mei-Yao Wu, Yang-Wei Lin
In this study, Ag hybrid BiPO4 (Ag/BiPO4) heterostructures were synthesized using a solvothermal method. The morphologies and optical properties of the Ag/BiPO4 heterostructures were drastically different from those of BiPO4 and were highly dependent on the AgNO3:BiPO4 weight percent during the synthesis. The three formulated heterostructures were evaluated for their photocatalytic degradation of methylene blue (MB) under UV light illumination; the 0.5%Ag/BiPO4 heterostructure was observed to result in 99% degradation of MB within 60min, a remarkably higher level of photodegradation activity than the levels caused by TiO2 and BiPO4...
November 22, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27908144/ionic-adsorption-on-the-brucite-0001-surface-a-periodic-electrostatic-embedded-cluster-method-study
#9
Eszter Makkos, Andrew Kerridge, Jonathan Austin, Nikolas Kaltsoyannis
Density functional theory (DFT) at the generalised gradient approximation level is employed within the periodic electrostatic embedded cluster method (PEECM) to model the brucite (0001) surface. Three representative studies are then used to demonstrate the reliability of the PEECM for the description of the interactions of various ionic species with the layered Mg(OH)2 structure, and its performance is compared with periodic DFT, an approach known to be challenging for the adsorption of charged species. The adsorption energies of a series of s block cations, including Sr(2+) and Cs(+) which are known to coexist with brucite in nuclear waste storage ponds, are well described by the embedded cluster model, provided that basis sets of triple-zeta quality are employed for the adsorbates...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27906140/management-of-citrus-waste-by-switching-in-the-production-of-nanocellulose
#10
Sania Naz, Naveed Ahmad, Javeed Akhtar, Nasir Mehmood Ahmad, Attarad Ali, Muhammad Zia
Citrus fruit processing industries produce a vast quantity of waste materials as peel and pulp that are not handled properly. In present study, waste generated from citrus has been used for extraction of cellulose and nanocellulose. The aggregated cellulose, derived after alkaline treatment, was acid hydrolysed; resulted in reduction of the size of cellulose fibre. The cellulose showed amorphous structure revealed by X-ray diffraction analysis. Scanning electron microscopy analysis explained densely packed structure of nanocellulose...
December 2016: IET Nanobiotechnology
https://www.readbyqxmd.com/read/27901554/a-possible-wound-dressing-material-from-marine-food-waste
#11
Senthil Rethinam, Prabakaran Nivedita, Thiagarajan Hemalatha, Sathyaraj Weslen Vedakumari, Thotapalli Parvathaleswara Sastry
PURPOSE: Bluefin Trevally (Caranx melampygus) fish is mainly used for fillet production, the bones of which are discarded as a major solid waste in the fish food processing industry. In the present study, novel collagen films were prepared using the bones of Bluefin Trevally (BT). The study investigates the potential of using this collagen film as a wound dressing material. METHODS: The prepared collagen films (CFs) were characterized for their physicochemical properties using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), atomic force microscopy (AFM), tensile strength, elongation at break, etc...
November 29, 2016: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/27895626/a-proposal-for-formation-of-archaean-stromatolites-before-the-advent-of-oxygenic-photosynthesis
#12
John F Allen
Stromatolites are solid, laminar structures of biological origin. Living examples are sparsely distributed and formed by cyanobacteria, which are oxygenic phototrophs. However, stromatolites were abundant between 3.4 and 2.4 Gyr, prior to the advent of cyanobacteria and oxygenic photosynthesis. Here I propose that many Archaean stromatolites were seeded at points of efflux of hydrogen sulfide from hydrothermal fields into shallow water, while their laminar composition arose from alternating modes of strictly anoxygenic photosynthetic metabolism...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27890409/geochemistry-of-arsenic-in-low-sulfide-high-carbonate-coal-waste-rock-elk-valley-british-columbia-canada
#13
Ashis Biswas, M Jim Hendry, Joseph Essilfie-Dughan
This study investigated the geochemistry of arsenic (As) in low sulfide-high carbonate coal waste rock of the Elk Valley, British Columbia, Canada. Its abundance and mineralogical associations in waste rock of different placement periods were determined in addition to its mobilization into porewater and rock-drain effluent. The mean (5.34mg/kg; 95% confidence interval: 4.95-5.73mg/kg) As concentration in the waste rock was typical of sedimentary rock. Electron microprobe and As K-edge X-ray absorption near-edge spectroscopic analyses showed the As is predominantly associated with primary pyrites in both source and freshly blasted waste rock...
November 24, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27889850/chemical-fractionation-and-health-risk-assessment-of-particulate-matter-bound-metals-in-pune-india
#14
Rohi Jan, Ritwika Roy, Suman Yadav, P Gursumeeran Satsangi
The present study deals with the assessment of sequential extraction of particulate matter (PM)-bound metals and the potential health risks associated with them in a growing metropolitan city (Pune) of India. The average mass concentration of both PM2.5-10 and PM2.5 exceeded the National Ambient Air Quality Standards. Significant seasonal variation in mass concentration was found for both size fractions of PM with higher values in winter season and lower in monsoon. Chemical species of the studied trace metals in PM exhibited significant differences, due to difference in sources of pollution...
November 26, 2016: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/27889697/characterization-of-plastic-blends-made-from-mixed-plastics-waste-of-different-sources
#15
Irina Turku, Timo Kärki, Kimmo Rinne, Ari Puurtinen
This paper studies the recyclability of construction and household plastic waste collected from local landfills. Samples were processed from mixed plastic waste by injection moulding. In addition, blends of pure plastics, polypropylene and polyethylene were processed as a reference set. Reference samples with known plastic ratio were used as the calibration set for quantitative analysis of plastic fractions in recycled blends. The samples were tested for the tensile properties; scanning electron microscope-energy-dispersive X-ray spectroscopy was used for elemental analysis of the blend surfaces and Fourier transform infrared (FTIR) analysis was used for the quantification of plastics contents...
November 26, 2016: Waste Management & Research
https://www.readbyqxmd.com/read/27889660/the-ph-dependent-leaching-behavior-of-slags-from-various-stages-of-a-copper-smelting-process-environmental-implications
#16
Alice Jarošíková, Vojtěch Ettler, Martin Mihaljevič, Bohdan Kříbek, Ben Mapani
The leaching behaviors of primary copper (Cu) slags originating from Ausmelt, reverbatory, and converter furnaces operating under a single technological process were compared to a residual slag tailing obtained by slag re-processing via flotation and metal recovery. The EN 12457-2 leaching test, used for assessment of the hazardous properties, was followed by the CEN/TS 14997 pH-static leaching test (pH range 3-12). Both leaching experiments were coupled with a mineralogical investigation of the primary and secondary phases as well as geochemical modeling...
November 24, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27887815/recycled-hierarchical-tripod-like-cucl-from-cu-pcb-waste-etchant-for-lithium-ion-battery-anode
#17
Song Liu, Hongying Hou, Xianxi Liu, Jixiang Duan, Yuan Yao, Qishu Liao, Jing Li, Yunzhen Yang
Hierarchical CuCl with high economic value added (EVA) was successfully recycled with 85% recovery from the acid Cu printed circuit board (Cu-PCB) waste etchant via facile liquid chemical reduction. The micro-structure and morphology of the recycled hierarchical CuCl were systematically characterized in terms of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET). Furthermore, the corresponding electrochemical performances as lithium ion battery (LIB) anode were also investigated in terms of galvanostatic charge/discharge, cyclic voltammetry (CV) and AC impedance...
October 29, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27877889/facile-synthesis-of-reduced-graphene-oxide-gold-nanohybrid-for-potential-use-in-industrial-waste-water-treatment
#18
Prasenjit Kar, Samim Sardar, Bo Liu, Monjoy Sreemany, Peter Lemmens, Srabanti Ghosh, Samir Kumar Pal
Here, we report a facile approach, by the photochemical reduction technique, for in situ synthesis of Au-reduced graphene oxide (Au-RGO) nanohybrids, which demonstrate excellent adsorption capacities and recyclability for a broad range of dyes. High-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) data confirm the successful synthesis of Au-RGO nanohybrids. The effect of several experimental parameters (temperature and pH) variation can effectively control the dye adsorption capability...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27876392/metallothionein-assisted-periplasmic-lead-sequestration-as-lead-sulfite-by-providencia-vermicola-strain-sj2a
#19
Jaya Sharma, Kashif Shamim, Santosh Kumar Dubey, Ram Murti Meena
Lead resistant Providencia vermicola strain SJ2A was isolated from the waste of a battery manufacturing industry which could tolerate upto 3.0mM lead nitrate in the minimal medium. Interestingly, this isolate showed presence of a plasmid borne metallothionein gene, bmtA that matched significantly (96%) with that of Pseudomonas aeruginosa. Scanning electron micrographs of bacterial cells exposed to lead revealed a unique alteration in the cell morphology from rods to long inter-connected filaments. On the other hand, electron dispersive X-ray spectroscopy (EDX) clearly indicated no significant lead adsorption therefore, we speculated intracellular sequestration in this bacterial strain...
November 19, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27858800/removal-of-methylene-blue-by-adsorption-on-aluminosilicate-waste-equilibrium-kinetic-and-thermodynamic-parameters
#20
Carlos Alberto Policiano Almeida, Tânia Marina Palhano Zanela, Clodoaldo Machado, Juan Antônio Altamirano Flores, Luiz Fernando Scheibe, Nicholas P Hankins, Nito Angelo Debacher
An aluminosilicate waste (AW) was investigated as adsorbent for methylene blue (MB) dye. AW was characterized by petrography, X-ray diffractometry, X-ray fluorescence, scanning electron microscopy, thermogravimetry and zeta potential measurements. It was found that AW contains kaolinite, and other minor components such as quartz, muscovite, smectite, siderite, pyrite and organic compounds. The chemical composition of AW is mainly SiO2 (49%) and Al2O3 (23%) and it has negative superficial charge above pH 1.73...
November 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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