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https://www.readbyqxmd.com/read/28612648/recovery-of-phosphorous-from-industrial-waste-water-by-oxidation-and-precipitation
#1
Rikard Ylmén, Anna M K Gustafsson, Caterina Camerani-Pinzani, Britt-Marie Steenari
This paper describes the development of a method for recovery of phosphorous from one of the waste waters at an Akzo Nobel chemical plant in Ale close to Göteborg. It was found that it is possible to transform the phosphorous in the waste water to a saleable product, i.e. a slowly dissolving fertiliser. The developed process includes oxidation of phosphite to phosphate with hydrogen peroxide and heat. The phosphate is then precipitated as crystalline struvite (ammonium magnesium phosphate) by addition of magnesium chloride...
June 14, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28582747/application-of-drum-compost-and-vermicompost-to-improve-soil-health-growth-and-yield-parameters-for-tomato-and-cabbage-plants
#2
Linee Goswami, Anil Nath, Sweety Sutradhar, Satya Sundar Bhattacharya, Ajay Kalamdhad, Kowsalya Vellingiri, Ki-Hyun Kim
Utilization of different types of solid wastes through composting is important for environmental sustainability and restoring soil quality. Although drum composting is an efficient technology, the possibility of heavy metal contamination restricts its large-scale use. In this research, a field experiment was conducted to evaluate the impact of water hyacinth drum compost (DC) and traditional vermicompost (VC) on soil quality and crop growth in an agro-ecosystem cultivated intensively with tomato and cabbage as test crops...
June 2, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28553963/frequency-dependent-stability-of-cnt-joule-heaters-in-ionizable-media-and-desalination-processes
#3
Alexander V Dudchenko, Chuxiao Chen, Alexis Cardenas, Julianne Rolf, David Jassby
Water shortages and brine waste management are increasing challenges for coastal and inland regions, with high-salinity brines presenting a particularly challenging problem. These high-salinity waters require the use of thermally driven treatment processes, such as membrane distillation, which suffer from high complexity and cost. Here, we demonstrate how controlling the frequency of an applied alternating current at high potentials (20 Vpp) to a porous thin-film carbon nanotube (CNT)/polymer composite Joule heating element can prevent CNT degradation in ionizable environments such as high-salinity brines...
July 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28550791/environmental-indicators-of-the-combustion-of-prospective-coal-water-slurry-containing-petrochemicals
#4
Margarita A Dmitrienko, Galina S Nyashina, Pavel A Strizhak
Negative environmental impact of coal combustion has been known to humankind for a fairly long time. Sulfur and nitrogen oxides are considered the most dangerous anthropogenic emissions. A possible solution to this problem is replacing coal dust combustion with that of coal water slurry containing petrochemicals (CWSP). Coal processing wastes and used combustible liquids (oils, sludge, resins) are promising in terms of their economic and energy yield characteristics. However, no research has yet been conducted on the environmental indicators of fuels based on CWSP...
May 18, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28544414/effective-low-cost-recovery-of-toxic-arsenate-anions-from-water-using-hollow-sphere-trapper-geodes
#5
Sherif A El-Safty, Mohamed A Shenashen, Naeem Akhtar, Mahmoud M Selim, Wafaa M Morsy, Hitoshi Yamaguchi, Satoshi Kawada, Abdulaziz A Alhamid, Naoki Ohashi, Izumi Ichinose, Ahmed Alamoudi
Because of the devastating impacts of arsenic to terrestrial and aquatic organisms, recovery, removal, disposal and management of arsenic-contaminated water has a considerable challenge and become an urgent necessity in the field of water treatment. This study reports control fabrication of low-cost adsorbents based on microscopic NiO hollow sphere geode-shelled a 100 nm of poly-CN nano-sphere particles-like nodules of poly-carbon nitride that intrinsically stacked and wrapped around the hollow nest spheres to form 500-700 nm shell...
May 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28540557/dissolution-of-steel-slags-in-aqueous-media
#6
Shashikant Yadav, Anurag Mehra
Steel slag is a major industrial waste in steel industries, and its dissolution behavior in water needs to be characterized in the larger context of its potential use as an agent for sequestering CO2. For this purpose, a small closed system batch reactor was used to conduct the dissolution of steel slags in an aqueous medium under various dissolution conditions. In this study, two different types of steel slags were procured from steel plants in India, having diverse structural features, mineralogical compositions, and particle sizes...
May 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28516417/microbial-lipid-production-from-enzymatic-hydrolysate-of-pecan-nutshell-pretreated-by-combined-pretreatment
#7
Lizhen Qin, Hanyu Qian, Yucai He
Biodiesel is a fuel composed of monoalkyl esters of long-chain fatty acids derived from renewable biomass sources. In this study, biomass waste pecan nutshell (PS) was attempted to be converted into microbial oil. For effective utilization of PS, sequential pretreatment with ethylene glycol-H2SO4-water (78:2:20, wt:wt:wt) at 130 °C for 30 min and aqueous ammonia (25 wt%) at 50 °C for 24 h was used to enhance its enzymatic saccharification. Significant linear correlation was obtained about delignification-saccharification (R (2) = 0...
May 17, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28514712/nitrogen-doped-carbon-dots-derived-from-sargassum-fluitans-as-fluorophore-for-dna-detection
#8
S Godavarthi, K Mohan Kumar, E Vázquez Vélez, A Hernandez-Eligio, M Mahendhiran, N Hernandez-Como, M Aleman, L Martinez Gomez
This work focused on the use of waste seaweed Sargassum fluitans (S. fluitans) as carbon source precursor to prepare nitrogen doped carbon dots (NCDs) by hydrothermal method. High resolution transmission electron microscopic (HR-TEM) studies revealed that the synthesized water soluble NCDs are in the size range of 2-8nm and exhibits excellent fluorescent properties with a quantum yield of 18.2%. Elemental nitrogen in NCDs was evidenced by X-ray photoelectron spectroscopy (XPS) and Fourier transformed infrared spectrum (FT-IR)...
May 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28510421/converting-carbohydrates-to-carbon-based-photocatalysts-for-environmental-treatment
#9
Zhuofeng Hu, Zhurui Shen, Jimmy C Yu
Carbohydrates in biomass can be converted to semiconductive hydrothermal carbonation carbon (HTCC), a material that contains plenty of sp(2)-hybridization structures. Under solar light illumination, HTCC generates photoexcited electrons, holes, and hydroxyl radicals. These species can be used for photocatalytic treatment such as water disinfection and degradation of organic pollutants. The photocatalytic activity of HTCC can be significantly enhanced by iodine doping. The enhancement mechanism is investigated by density functional theoretical calculations and electrochemical measurements...
May 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28501201/waste-derivitized-blue-luminescent-carbon-quantum-dots-for-selenite-sensing-in-water
#10
Pooja Devi, Gurvinder Kaur, Anupma Thakur, Navneet Kaur, Anita Grewal, Praveen Kumar
Herein, we report an environmental friendly, facile, and completely green synthetic method for producing carbon quantum dots (CQDs) from whey, a major dairy waste. The as-prepared monodispersed diameter CQDs exhibit blue luminescence with noteworthy quantum yield (~11.4%) and excitation dependent emission behaviour. Nuclear magnetic resonance (NMR) analysis reveals the presence of aromatized carbon peaks, leading to polymerized CQDs diameter architecture during whey pyrolysis. The X-ray and selected area electron diffraction patterns confirm their amorphous nature...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28490815/flexible-and-self-healing-aqueous-supercapacitors-for-low-temperature-applications-polyampholyte-gel-electrolytes-with-biochar-electrodes
#11
Xinda Li, Li Liu, Xianzong Wang, Yong Sik Ok, Janet A W Elliott, Scott X Chang, Hyun-Joong Chung
A flexible and self-healing supercapacitor with high energy density in low temperature operation was fabricated using a combination of biochar-based composite electrodes and a polyampholyte hydrogel electrolyte. Polyampholytes, a novel class of tough hydrogel, provide self-healing ability and mechanical flexibility, as well as low temperature operation for the aqueous electrolyte. Biochar is a carbon material produced from the low-temperature pyrolysis of biological wastes; the incorporation of reduced graphene oxide conferred mechanical integrity and electrical conductivity and hence the electrodes are called biochar-reduced-graphene-oxide (BC-RGO) electrodes...
May 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28489344/in-situ-engineering-toward-core-regions-a-smart-way-to-make-applicable-fef3-carbon-nanoreactor-cathodes-for-li-ion-batteries
#12
Linpo Li, Jianhui Zhu, Maowen Xu, Jian Jiang, Chang Ming Li
Iron fluorides (FeFx) have attracted great interest in Li-ion batteries due to their high theoretical capacity, low cost, and preferable cell safety. However, their practical utilization is severely impeded by inferior electrode kinetics, leading to poor electrode cyclability and rate capabilities. The major bottleneck should be lack of any effective engineering techniques to make reliable encapsulation and conducting matrix on soluble FeFx species. Herein, we propose an applicable synthetic strategy where the massive production of FeF3@carbon nanoreactors (total size: ∼60 nm) can be easily achieved by in situ engineering toward the core regions in hybrids, with the iron rust wastes and common solvents as raw materials...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28488705/ni-co-ti-layered-double-hydroxide-for-highly-efficient-photocatalytic-degradation-of-rhodamine-b-and-acid-red-g-a-comparative-study
#13
Priyadarshi Roy Chowdhury, Krishna G Bhattacharyya
Optically responsive, luminescent Ni/Co/Ti layered double hydroxide (LDH), synthesized by a single step hydrothermal route, exhibits highly efficient photodegradation of cationic and anionic dyes, Rhodamine B (∼99.8%) and Acid Red G (∼99.6%) respectively, better than that of commercial catalysts like NiO, CoO and TiO2. The LDH has been characterized by using XRD, XPS, PL, TRES, EIS, TEM, SEM-EDX, AFM, UV-visible DRS, N2-sorption desorption, ξ-potential, FT-IR and TG techniques. The characterized results indicate that the LDH possesses hexagonal morphology, a high surface area, a narrow band gap, defect states and oxygen vacancies within its layered framework...
June 14, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28462684/integrated-gasification-combined-cycle-using-egyptian-maghara-coal-rice-straw-feedstock
#14
A Hegazy, A O Ghallab, F H Ashour
Rice straw is an agricultural waste that causes an annoying problem in Egypt if it is not well exploited. This study focuses on using this waste in power generation by co-gasification of Egyptian Maghara coal and rice straw blends using entrained flow gasifier technology. Aspen Plus was used to conduct a parametric study for investigation of the effect of changing the inputs to the gasifier on the produced gas composition. Three different input parameters, influencing the performance of the gasifier, including the percentage of coal to rice straw in the blend, the fraction of added water to the blend, and the mass percentage of oxygen with respect to the mass of the blend fed to the gasifier were analysed...
April 1, 2017: Waste Management & Research
https://www.readbyqxmd.com/read/28448911/adsorption-of-polar-organic-molecules-on-sediments-case-study-on-callovian-oxfordian-claystone
#15
S Rasamimanana, G Lefèvre, R V H Dagnelie
The release and transport of anthropogenic organic matter through the geosphere is often an environmental criterion of safety. Sedimentary rocks are widely studied in this context as geological barriers for waste management. It is the case of Callovian-Oxfordian claystone (COx), for which several studies report adsorption of anthropogenic organic molecules. In this study, we evaluated and reviewed adsorption data of polar organic molecules on COx claystone. Experiments were performed on raw claystone, decarbonated and clay fractions...
April 21, 2017: Chemosphere
https://www.readbyqxmd.com/read/28443361/the-effect-of-alkali-on-the-product-distribution-from-black-liquor-conversion-under-supercritical-water
#16
Y Hawangchu, D Atong, V Sricharoenchaikul
Lignin in chemical pulping waste, or black liquor (BL), can be converted into various products via supercritical water gasification (SCWG). However, the inherited alkaline contents from the pulping chemicals may affect the product yields and properties. In this research, the influence of the residual alkali on the product distribution via SCWG of soda BL and kraft BL was evaluated. The SCWG was performed in a batch quartz reactor for 10 min at various temperatures (673, 773 and 873 K) and pressures (250, 300 and 400 bar)...
May 11, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28442173/analysis-of-tar-compounds-and-quantification-of-naphthalene-from-thermal-treatment-of-household-biowaste
#17
S Vakalis, F Patuzzi, K Moustakas, A Sotiropoulos, D Malamis, M Baratieri
Household biowaste represent the organic fraction of municipal solid waste and are an underutilized resource. Although previous studies have performed pyrolysis of organic waste, the vast majority has been on specific presorted feedstock or conventional lignocellulosic streams. Therefore, there is a lack of pyrolysis applications on representative food waste as retrieved from households and this can be attributed primarily to their high water content and their degradability. But via the intermediate step of drying, long-term storage and thermal treatment have become possible...
April 22, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28436604/solvent-free-mechanochemical-synthesis-of-nitrogen-doped-nanoporous-carbon-for-electrochemical-energy-storage
#18
Christina Schneidermann, Nicolas Jäckel, Steffen Oswald, Lars Giebeler, Volker Presser, Lars Borchardt
Nitrogen-doped nanoporous carbons were synthesized by a solvent-free mechanochemically induced one-pot synthesis. This facile approach involves the mechanochemical treatment and carbonization of three solid materials: potassium carbonate, urea, and lignin, which is a waste product from pulp industry. The resulting nitrogen-doped porous carbons offer a very high specific surface area up to 3000 m(2)  g(-1) and large pore volume up to 2 cm(3)  g(-1) . The mechanochemical reaction and the impact of activation and functionalization are investigated by nitrogen and water physisorption and high-resolution X-ray photoelectron spectroscopy (XPS)...
April 24, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28434529/stochastic-multicomponent-reactive-transport-analysis-of-low-quality-drainage-release-from-waste-rock-piles-controls-of-the-spatial-distribution-of-acid-generating-and-neutralizing-minerals
#19
Daniele Pedretti, K Ulrich Mayer, Roger D Beckie
In mining environmental applications, it is important to assess water quality from waste rock piles (WRPs) and estimate the likelihood of acid rock drainage (ARD) over time. The mineralogical heterogeneity of WRPs is a source of uncertainty in this assessment, undermining the reliability of traditional bulk indicators used in the industry. We focused in this work on the bulk neutralizing potential ratio (NPR), which is defined as the ratio of the content of non-acid-generating minerals (typically reactive carbonates such as calcite) to the content of potentially acid-generating minerals (typically sulfides such as pyrite)...
April 12, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28433819/environmentally-and-economically-efficient-utilization-of-coal-processing-waste
#20
Margarita A Dmitrienko, Pavel A Strizhak
High concentrations of hazardous anthropogenic emissions (sulfur, nitrogen and carbon oxides) from solid fuel combustion in coal burning plants cause environmental problems that have been especially pressing over the last 20-30 years. A promising solution to these problems is a switch from conventional pulverized coal combustion to coal-water slurry fuel. In this paper, we pay special attention to the environmental indicators characterizing the combustion of different coal ranks (gas, flame, coking, low-caking, and nonbaking coals) and coal-water slurry fuels based on the coal processing waste - filter cakes...
November 15, 2017: Science of the Total Environment
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