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waste water

Shun Yang, Yaru Wang, Shiting Lin, Jie Fan, Chang Liu, Xiao Yan
Polymeric absorbents were surface-engineered with photocatalysts for simultaneous adsorption and degradation of organic wastes in water using a facile Pickering emulsion polymerization method. This facile strategy not only overcome the low light energy utilization of traditional photocatalysts-polymer nanocomposites due to the core-shell structure, but also could convenient control the microstructure of the photocatalysts owing to the separated preparation procedure when compared to the direct growth method...
October 4, 2017: Chemosphere
Darpan Chorghe, Mutiara Ayu Sari, Shankararaman Chellam
One promising water management strategy during hydraulic fracturing is treatment and reuse of flowback/produced water. In particular, the saline flowback water contains many of the chemicals employed for fracking, which need to be removed before possible reuse as "frac water." This manuscript targets turbidity along with one of the additives; borate-based cross-linkers used to adjust the rheological characteristics of the frac-fluid. Alum and ferric chloride were evaluated as coagulants for clarification and boron removal from saline flowback water obtained from a well in the Eagle Ford shale...
September 28, 2017: Water Research
Vincent Hervé, Boris Leroy, Albert Da Silva Pires, Pascal Jean Lopez
In most cities, streets are designed for collecting and transporting dirt, litter, debris, storm water and other wastes as a municipal sanitation system. Microbial mats can develop on street surfaces and form microbial communities that have never been described. Here, we performed the first molecular inventory of the street gutter-associated eukaryotes across the entire French capital of Paris and the non-potable waters sources. We found that the 5782 OTUs (operational taxonomic units) present in the street gutters which are dominated by diatoms (photoautotrophs), fungi (heterotrophs), Alveolata and Rhizaria, includes parasites, consumers of phototrophs and epibionts that may regulate the dynamics of gutter mat microbial communities...
October 13, 2017: ISME Journal
Subramanian Natarajan, S Anantharaj, Rajesh J Tayade, Hari C Bajaj, Subrata Kundu
A facile way of recovering 3d transition metals of industrial importance from spent lithium-ion batteries (LIBs) without using any surfactants has been developed. Mn- and Co-rich spent LIBs were chosen as sustainable sources for recovering the oxides of the respective elements. The physical dismantling of Li-ion batteries, chemical leaching with 2 M acetic acid, precipitation with ammonium carbonate, hydrothermal conditioning and calcination at 650 °C led to the facile formation of spherical spinel MnCo2O4 with very high morphological selectivity...
October 13, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Nuria Lozano, Clifford P Rice, Mark Ramirez, Alba Torrents
Triclocarban [N-(4-chlorophenyl)-N-(3,4-dichlorophenyl) urea] (TCC) is an antimicrobial agent utilized in a variety of consumer products. It is commonly released into domestic wastewaters and upon treatment, it is known to accumulate in biosolids. This study examines the occurrence of TCC in biosolids and its long-term fate in biosolid-treated soils. TCC levels in the biosolids from a large waste water treatment plant (WWTP) over 2 years showed little variability at 18,800 ± 700 ng g(-1) dry wt. (mean ± SEM)...
October 13, 2017: Environmental Science and Pollution Research International
Xiaojuan Gong, Zengbo Li, Qin Hu, Ruixin Zhou, Shaomin Shuang, Chuan Dong
A novel fluorescent probe based on N,S,P co-doped carbon nanodots (N,S,P-CNDSac) has been facile and fast fabricated by a one-step hydrothermal pyrolysis of Saccharomyces cerevisiae and utilized for label-free and "on-off-on" sequential detection manganese(VII) and ʟ-ascorbic acid (ʟ-AA). The fluorescence of N,S,P-CNDSac can be effectively quenched by Mn(VII) based on inner filter effect (IFE) and recovered upon the addition of ʟ-AA due to the easy-conversion of Mn(VII) to reduced states (i.e. Mn(IV), Mn(II) and Mn(0)) by ʟ-AA...
October 12, 2017: ACS Applied Materials & Interfaces
Yutthapong Sangnoi, Sunipa Chankaew, Sompong O-Thong
BACKGROUND AND OBJECTIVE: Toxic nitrogen compounds are one cause decreasing of shrimp production and water pollution. Indigenous Halomonas spp., isolated from Pacific white shrimp farm are benefitted for saline ammonium waste water treatment. This study aimed to isolate the heterotrophic-halophilic Halomonas spp. and investigate their ammonium removal efficiency. MATERIALS AND METHODS: Halomonas spp., were isolated by culturing of samples collected from shrimp farm into modified Pep-Beef-AOM medium...
2017: Pakistan Journal of Biological Sciences: PJBS
Jinyang Jiang, Pan Wang, Dongshuai Hou
The cement-based matrices are preferred candidates in disposing nuclear waste due to the immobilization role of the calcium-silicate-hydrate (C-S-H) gel. To better understand the immobilization mechanism of cementitious materials, molecular dynamics was utilized to investigate the intensity distribution, local structure and dynamics properties of Cs(+) ions in the vicinity of the calcium silicate surface. The strong inner-sphere adsorbed cesium ions were restricted by coordinated oxygen atoms in bridging and pair silicate tetrahedron and water molecules were fixed in the silicate channel by H-bonds network...
October 12, 2017: Physical Chemistry Chemical Physics: PCCP
Christian Schmidt, Tobias Krauth, Stephan Wagner
A substantial fraction of marine plastic debris originates from land-based sources and rivers potentially act as a major transport pathway for all sizes of plastic debris. We analyzed a global compilation of data on plastic debris in the water column across a wide range of river sizes. Plastic debris loads, both microplastic (particles <5 mm) and macroplastic (particles >5 mm) are positively related to the mismanaged plastic waste (MMPW) generated in the river catchments. This relationship is nonlinear where large rivers with  population-rich catchments delivering a disproportionately higher fraction of MMPW into the sea...
October 11, 2017: Environmental Science & Technology
Saeid Baroutian, M T Munir, Jiyang Sun, Nicky Eshtiaghi, Brent R Young
Food waste is gaining increasing attention worldwide due to growing concerns over its environmental and economic costs. Understanding the rheological behaviour of food waste is critical for effective processing so rheological measurements were carried out for different food waste compositions at 25, 35 and 45 °C. Food waste samples of various origins (carbohydrates, vegetables & fruits, and meat), anaerobically digested and diluted samples were used in this study. The results showed that food waste exhibits shear-thinning flow behaviour and viscosity of food waste is a function of temperature and composition...
October 7, 2017: Waste Management
Khurram Shehzad, Chang Xie, Junyong He, Xingguo Cai, Weihong Xu, Jinhuai Liu
Increasing exposure to arsenic (As) contaminated ground water has become a global health hazard to humanity. Suitable adsorbent for As removal from water, especially for As(III) than As(V), is an urgent but still a challenging task. In this study, waste orange peel (OP) was modified with magnetic nanoparticles followed by calcination as a novel adsorbent and investigated for instantaneous oxidation and adsorption of As(III) from aqueous solutions. The batch adsorption experimental results showed that calcined magnetic orange peel composites (CMOPC) exhibited superior As(III) adsorption capacity (10...
September 30, 2017: Journal of Colloid and Interface Science
Sumant M Avasarala, Peter C Lichtner, Abdul-Mehdi S Ali, Ricardo González-Pinzón, Johanna M Blake, Jose M Cerrato
The reactive transport of uranium (U) and vanadium (V) from abandoned mine wastes collected from the Blue Gap/Tachee Claim 28 mine site, AZ was investigated by integrating flow-through column experiments with reactive transport modelling, and electron microscopy. The mine wastes were sequentially reacted in flow-through columns at pH 7.9 (10 mM HCO3(-)) and pH 3.4 (10 mM CH3COOH) to evaluate the effect of environmentally relevant conditions encountered at Blue Gap/Tachee on the release of U and V. The reaction rate constants (km) for the dissolution of uranyl-vanadate (U-V) minerals predominant at Blue Gap/Tachee were obtained from simulations with the reactive transport software, PFLOTRAN...
October 10, 2017: Environmental Science & Technology
Lu Chen, Shelie A Miller, Brian R Ellis
The human toxicity impact (HTI) of electricity produced from shale gas is lower than the HTI of electricity produced from coal, with 90% confidence using a Monte Carlo Analysis. Two different impact assessment methods estimate the HTI of shale gas electricity to be one-to-two orders of magnitude less than the HTI of coal electricity (0.016-0.024 DALY/GWh versus 0.69-1.7 DALY/GWh). Further, an implausible shale gas scenario where all fracturing fluid and untreated produced water is discharged directly to surface water throughout the lifetime of a well also has a lower HTI than coal electricity...
October 10, 2017: Environmental Science & Technology
Qian Shang, Haifang Tang, Yinghui Wang, Kefu Yu, Liwei Wang, Ruijie Zhang, Shaopeng Wang, Rui Xue, Chaoshuai Wei
As a kind of tropical agricultural solid waste, cassava dregs had become a thorny nonpoint source pollution problem. This study investigated the feasibility of applying cassava dregs as a substitute for sucrose in biofloc technology (BFT) systems. Three types of biofloc systems (using three different carbon sources sucrose (BFT1), cassava dregs (BFT2) and enzyme-hydrolyzed cassava dregs (BFT3) respectively), and the control were constructed in this experiment in 200L tanks with a C/N ratio of 20/1. The comparison of the water quality indicators (The total ammonia nitrogen (TAN), nitrite (NO2(-)-N), nitrate (NO3(-)-N), chemical oxygen demand (COD)), biofloc for the above four groups was performed, and the results indicated that BFT3 showed greater potential to the formation of biofloc, which was beneficial for the water quality control...
October 6, 2017: Science of the Total Environment
Jack E T Grimes, Gemechu Tadesse, Iain A Gardiner, Elodie Yard, Yonas Wuletaw, Michael R Templeton, Wendy E Harrison, Lesley J Drake
BACKGROUND: Inadequate nutrition; neglected topical diseases; and insufficient water, sanitation, and hygiene (WASH) are interrelated problems in schools in low-income countries, but are not routinely tackled together. A recent three-year longitudinal study investigated integrated school health and nutrition approaches in 30 government primary schools in southern Ethiopia. Here, we report on baseline associations between sanitation, hookworm infection, anemia, stunting, and wasting. METHODS: In each school, the Schistosoma mansoni, S...
October 2017: PLoS Neglected Tropical Diseases
Hyun-Hee Jang, Gyu-Tae Seo, Dae-Woon Jeong
To obtain a suitable oxidation method for removing the color and lowering the chemical oxygen demand (COD) of waste soy sauce, Fenton (Fe(2+)), Fenton-like (Fe(3+)), and ozone (O₃) oxidation methods are used as the target reactions. In experimental conditions for Fenton oxidation, the dose of Fe(2+) and Fe(3+) was varied between 100 mg/L and 300 mg/L. The dose of hydrogen peroxide for the reaction was injected from 100-1000 mg/L. For ozone oxidation, the pH was increased from 3 to 14 and the O₃-containing gas was supplied continuously for 30 min through a gas diffuser at the bottom of the reactor at different applied O₃ doses (10-90 mg/L)...
October 7, 2017: International Journal of Environmental Research and Public Health
Justen J Poole, German A Gomez-Rios, Ezel Boyaci, Nathaly Reyes-Garcés, Janusz Pawliszyn
The widespread use of pharmaceuticals in both human and animal populations and the resultant contamination of surface waters from the outflow of water treatment facilities is an issue of growing concern. This has raised the need for analytical methods that can both perform rapid sample analysis and overcome the limitations of conventional analysis procedures, such as multistep workflows and tedious procedures. Coated blade spray (CBS) is a solid-phase-microextraction-based technique that enables the direct-to-mass-spectrometry analysis of extracted compounds via the use of limited organic solvent to desorb analytes and perform electrospray ionization...
October 9, 2017: Environmental Science & Technology
Jeffrey D Kiiskila, Dibyendu Sarkar, Kailey A Feuerstein, Rupali Datta
Acid mine drainage (AMD) is extremely acidic, sulfate-rich effluent from abandoned or active mine sites that also contain elevated levels of heavy metals. Untreated AMD can contaminate surface and groundwater and pose severe ecological risk. Both active and passive methods have been developed for AMD treatment consisting of abiotic and biological techniques. Abiotic techniques are expensive and can create large amounts of secondary wastes. Passive biological treatment mainly consists of aerobic or anaerobic constructed wetlands...
October 8, 2017: Environmental Science and Pollution Research International
Piyatida Klumphu, Camille Desfeux, Yitao Zhang, Sachin Handa, Fabrice Gallou, Bruce H Lipshutz
Several ppm level gold-catalyzed reactions enabled by the ligand HandaPhos can be performed at room temperature in aqueous nanoreactors composed of the surfactant Nok. Variously substituted allenes undergo cycloisomerization leading to heterocyclic products in good yields. Likewise, cyclodehydration is also illustrated under similar conditions, as is an intermolecular variant, hydration of terminal alkynes. Recycling of the catalyst and reaction medium is also illustrated. A low E factor associated with limited solvent use and therefore, waste generation, documents the greenness of this process...
September 1, 2017: Chemical Science
Th I Shaheen, Hossam E Emam
Cellulose nanocrystal (CNC) is a unique material obtained from naturally occurring cellulose fibers. Owing to their mechanical, optical, chemical, and rheological properties, CNC gained significant interest. Herein, we investigate the potential of commercially non-recyclable wood waste, in particular, sawdust as a new resource for CNC. Isolation of CNC from sawdust was conducted as per acid hydrolysis which induced by ultrasonication technique. Thus, sawdust after being alkali delignified prior sodium chlorite bleaching, was subjected to sulfuric acid with concentration of 65% (w/w) at 60(°)C for 60min...
October 6, 2017: International Journal of Biological Macromolecules
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