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Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering

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https://www.readbyqxmd.com/read/28922624/quantification-of-voc-emissions-from-paint-spraying-on-a-construction-site-using-solid-phase-microextraction-devices
#1
Wen-Hsi Cheng, Hsiao-Lin Huang, Kang-Shin Chen, Yu-Jen Chang
The objective of this study was to measure the emission of, and personal exposure to workers, volatile organic compound (VOC) during paint spraying on a construction site. Needle trap samplers (NTSs), which are a green solid phase microextraction sampling technology, were used to obtain air samples at a large music exhibition center. The standard active sampling method using charcoal tubes and a personal air pump, Method 1501, was simultaneously utilized at the sampling sites to assess the workers' VOC exposures...
September 18, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28922086/assessment-of-ah-receptor-transcriptional-activity-mediated-by-halogenated-dibenzo-p-dioxins-and-dibenzofurans-pxdd-fs-in-human-and-mouse-cell-systems
#2
Kari L Organtini, Troy D Hubbard, Gary H Perdew, Frank L Dorman
Polybrominated and mixed bromo/chloro dibenzo-p-dioxins and dibenzofurans (PXDD/Fs) are emerging environmental contaminants of concern. Thus far, an understanding of the toxicological behavior of these chemical species and their impact upon human health is incomplete. Here we utilized human and mouse hepatocellular carcinoma cell lines to examine the ability of differentially halogenated PXDD/F congeners to induce aryl hydrocarbon receptor (AHR)-mediated transcriptional activity. Dose-response experiments in reporter cell lines identified varied potencies among differentially halogenated PXDD/F isomers by comparison of EC50 values relative to the prototypical AHR agonist, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)...
September 18, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28920773/metronidazole-removal-in-powder-activated-carbon-and-concrete-containing-graphene-adsorption-systems-estimation-of-kinetic-equilibrium-and-thermodynamic-parameters-and-optimization-of-adsorption-by-a-central-composite-design
#3
S V Manjunath, S Mathava Kumar, Huu Hao Ngo, Wenshan Guo
Metronidazole (MNZ) removal by two adsorbents, i.e., concrete-containing graphene (CG) and powder-activated carbon (PAC), was investigated via batch-mode experiments and the outcomes were used to analyze the kinetics, equilibrium and thermodynamics of MNZ adsorption. MNZ sorption on CG and PAC has followed the pseudo-second-order kinetic model, and the thermodynamic parameters revealed that MNZ adsorption was spontaneous on PAC and non-spontaneous on CG. Subsequently, two-parameter isotherm models, i.e., Langmuir, Freundlich, Temkin, Dubinin-Radushkevich and Elovich models, were applied to evaluate the MNZ adsorption capacity...
September 18, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28920769/modacrylic-anion-exchange-fibers-for-cr-vi-removal-from-chromium-plating-rinse-water-in-batch-and-flow-through-column-experiments
#4
Seung-Chan Lee, Jin-Kyu Kang, Eun-Hye Sim, Nag-Choul Choi, Song-Bae Kim
The aim of this study was to investigate Cr(VI) removal from chromium-plating rinse water using modacrylic anion-exchange fibers (KaracaronTM KC31). Batch experiments were performed with synthetic Cr(VI) solutions to characterize the KC31 fibers in Cr(VI) removal. Cr(VI) removal by the fibers was affected by solution pH; the Cr(VI) removal capacity was the highest at pH 2 and decreased gradually with a pH increase from 2 to 12. In regeneration and reuse experiments, the Cr(VI) removal capacity remained above 37...
September 18, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28920759/spatial-distribution-of-polycyclic-aromatic-hydrocarbon-and-polychlorinated-biphenyl-sources-in-the-nakdong-river-estuary-south-korea
#5
Jun H Lee, Han J Woo, Kap S Jeong, Jeong W Kang, Jae U Choi, Eun J Jeong, Kap S Park, Dong H Lee
Our research team investigated the elemental composition and the presence of various toxic organic compounds, such as polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs), in estuary surface sediments to trace the spatial distribution of the sources of pollution deposited in Nakdong River, Busan, South Korea. The spatial patterns of elemental composition and toxic organic compounds were determined from the measurements of total organic carbon (TOC), total nitrogen, total sulfur, PAHs, and PCBs...
September 18, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28920758/occurrence-and-source-apportionment-of-polycyclic-aromatic-hydrocarbons-in-soils-and-sediment-from-hanfeng-lake-three-gorges-china
#6
Jing Cai, Shutao Gao, Like Zhu, Xuwei Jia, Xiangying Zeng, Zhiqiang Yu
This study was conducted to investigate the pollutant status and the retention mechanism of polycyclic aromatic hydrocarbons (PAHs) in soils and sediment from bank-water-level-fluctuating zone (WLFZ)-water systems in Hanfeng Lake, Three Gorges, China. The concentrations of the 16 PAHs ranged from 21.8 to 1324 ng g(-1) dry wt for all 20 soil and sediment samples. These concentration levels were remarkably lower than those in soils and sediment collected domestically and worldwide. PAHs with two and three rings were found to be dominant in all the samples, with phenanthrene being most abundant...
September 18, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28920752/treatment-of-synthetic-refinery-wastewater-in-anoxic-aerobic-sequential-moving-bed-reactors-and-sulphur-recovery
#7
Subrat Kumar Mallick, Saswati Chakraborty
Objective of the present study was to simultaneously biodegrade synthetic petroleum refinery wastewater containing phenol (750 mg/L), sulphide (750 mg/L), hydrocarbon (as emulsified diesel of 300 mg/L), ammonia-nitrogen (350 mg/L) at pH >9 in anoxic-aerobic sequential moving bed reactors. The optimum mixing speed of anoxic reactor was observed at 20 rpm and beyond that, removal rate remained constant. In anoxic reactor the minimum hydraulic retention time was observed to be 2 days for complete removal of sulphide, 40-50% removal of phenol and total hydrocarbons and 52% of sulphur recovery...
September 18, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28910592/optimization-of-process-condition-for-the-preparation-of-amine-impregnated-activated-carbon-developed-for-co2-capture-and-applied-to-methylene-blue-adsorption-by-response-surface-methodology
#8
Dipa Das, Bhim C Meikap
The present research describes the optimal adsorption condition for methylene blue (MB). The adsorbent used here was monoethanol amine-impregnated activated carbon (MEA-AC) prepared from green coconut shell. Response surface methodology (RSM) is the multivariate statistical technique used for the optimization of the process variables. The central composite design is used to determine the effect of activation temperature, activation time and impregnation ratio on the MB removal. The percentage (%) MB adsorption by MEA-AC is evaluated as a response of the system...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28910590/redox-mediator-free-degradation-of-sulfathiazole-and-tetracycline-using-phanerochaete-chrysosporium
#9
Jehun Kwak, Soonuk Yoon, Biswanath Mahanty, Chang-Gyun Kim
The removal of two of the most commonly used antibiotics, tetracycline (TC) and sulfathiazole (STZ), using laccase-producing Phanerochaete chrysosporium was studied in liquid-phase batch experiments in the absence of any synthetic redox mediator. The removal of STZ and TC from single antibiotic spikes varied from 97.8% to 15.4% and 98.8% to 31%, respectively, with increasing initial doses of 10-250 mg L(-1) within 14 days of incubation. The enzyme activity of P. chrysosporium was only minimally influenced by the concentrations of these antibiotics...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28910585/analysis-of-glycols-glycol-ethers-and-other-volatile-organic-compounds-present-in-household-water-based-hand-pump-sprays
#10
Tsuyoshi Kawakami, Kazuo Isama, Toshiko Tanaka-Kagawa, Hideto Jinnno
The aim of this investigation is to clarify the types and concentrations of VOCs present in various commercial household water-based hand pump spray products used in Japan, and to estimate their average concentrations in indoor air when the spray product is used. We selected glycol and glycol ethers as the main target compounds, as these chemicals were detected at high frequencies and concentrations in a national survey of Japanese indoor air pollution. The extraction of these chemicals using graphite carbon cartridges was examined, with good recoveries and reproducibilities being obtained...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28910583/performance-evaluation-of-startup-for-a-yeast-membrane-bioreactor-mbry-treating-landfill-leachate
#11
Míriam C S Amaral, Rosimeire F Gomes, Yara L Brasil, Sílvia M A Oliveira, Wagner G Moravia
The startup process of a membrane bioreactor inoculated with yeast biomass (Saccharomyces cerevisiae) and used in the treatment of landfill leachate was evaluated. The yeast membrane bioreactor (MBRy) was inoculated with an exogenous inoculum, a granulated active dry commercial bakers' yeast. The MBRy was successfully started up with a progressive increase in the landfill leachate percentage in the MBRy feed and the use of Sabouraud Dextrose Broth. The membrane plays an important role in the startup phase because of its full biomass retention and removal of organic matter...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28910582/model-based-performance-and-energy-analyses-of-reverse-osmosis-to-reuse-wastewater-in-a-pvc-production-site
#12
Kang Hu, Thorsten Fiedler, Laura Blanco, Sven-Uwe Geissen, Simon Zander, David Prieto, Angeles Blanco, Carlos Negro, Nathalie Swinnen
A pilot-scale reverse osmosis (RO) followed behind a membrane bioreactor (MBR) was developed for the desalination to reuse wastewater in a PVC production site. The solution-diffusion-film model (SDFM) based on the solution-diffusion model (SDM) and the film theory was proposed to describe rejections of electrolyte mixtures in the MBR effluent which consists of dominant ions (Na(+) and Cl(-)) and several trace ions (Ca(2+), Mg(2+), K(+) and SO4(2-)). The universal global optimisation method was used to estimate the ion permeability coefficients (B) and mass transfer coefficients (K) in SDFM...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28910575/behaviour-of-biopolymeric-substances-in-the-activated-sludge-of-an-mbr-system-working-with-high-hydraulic-retention-time
#13
Eugenio Marín, Jorge I Pérez, Miguel A Gómez
This study was undertaken to analyse the activated sludge of a membrane bioreactor (MBR), the behaviour of extracellular polymeric substances (EPS) and soluble microbial products (SMP) as well as their biopolymers composition, in the activated sludge of a membrane bioreactor (MBR) and their influence on membrane fouling were analysed. For the experiment an experimental fullscale MBR working with real urban wastewater at high hydraulic retention time with a variable sludge-retention time (SRT) was used. The MBR system worked in denitrification/nitrification conformation at a constant flow rate (Q = 0...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28910572/silver-nanoparticles-toxicity-against-airborne-strains-of-staphylococcus-spp
#14
Katarzyna A Wolny-Koładka, Dagmara K Malina
The aim of this study was to explore the toxicity of silver nanoparticles (AgNPs) synthesized by chemical reduction method assessment with regard to airborne strains of Staphylococcus spp. The first step of the experiment was the preparation of silver nanoparticle suspension. The suspension was obtained by a fast and simple chemical method involving the reduction of silver ions through a reducing factor in the presence of the suitable stabilizer required to prevent the aggregation. In the second stage, varied instrumental techniques were used for the analysis and characterization of the obtained nanostructures...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28910566/environmental-biodegradation-of-halophenols-by-activated-sludge-from-two-different-sewage-treatment-plants
#15
Wojciech Smułek, Agata Zdarta, Joanna Kwiczak, Agnieszka Zgoła-Grześkowiak, Zefiryn Cybulski, Ewa Kaczorek
Halophenols make a group of aromatic compounds that are resistible to biodegradation by environmental microorganisms. In this study, the biodegradation of 4-bromo-, 4-chloro- and 4-fluorophenols was studied with two types of activated sludges (from a small rural plant and from a bigger municipal plant) as an inoculum. Because of their wide use, surfactants are present in the wastewater and inhibitors enhance the biodegradation of different pollutants; the influence of natural surfactants on halophenols' biodegradation was also tested...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28841359/comparison-of-the-effects-and-distribution-of-zinc-oxide-nanoparticles-and-zinc-ions-in-activated-sludge-reactors
#16
Dongqing Zhang, Antoine P Trzcinski, Hyun-Suk Oh, Evelyn Chew, Yu Liu, Soon Keat Tan, Wun Jern Ng
Zinc Oxide nanoparticles (ZnO NPs) are being increasingly applied in the industry, which results inevitably in the release of these materials into the hydrosphere. In this study, simulated waste-activated sludge experiments were conducted to investigate the effects of Zinc Oxide NPs and to compare it with its ionic counterpart (as ZnSO4). It was found that even 1 mg/L of ZnO NPs could have a small impact on COD and ammonia removal. Under 1, 10 and 50 mg/L of ZnO NP exposure, the Chemical Oxygen Demand (COD) removal efficiencies decreased from 79...
August 25, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28841356/removal-of-phosphate-from-electrocoagulation-post-treatment-phosphate-reduction-using-octolig%C3%A2
#17
Dean F Martin, Bill Gilmore
The present study examined the removal of phosphorus following electrocoagulation post-treatment using a sample from a commercial firm. Samples were subjected to column chromatography using Octolig® a polyethylenediimine covalently attached to high-surface-area silica. Two commercial samples with significantly different phosphorus concentrations were evaluated: 10.2 ppm from polyphosphates and raw sample of 983 ppm P. After passing over Octolig®, the sample phosphate concentration was reduced to values of <0...
August 25, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28841354/speciation-of-as-in-environmental-samples-using-the-nano-tio2-pchg-faas-online-system
#18
Bianca S Pinheiro, Luana L Gimenes, Ailton J Moreira, André F de Araújo, Carolina D Freschi, Gian Paulo Giovanni Freschi
This work presents an alternative method for arsenic speciation using the nano-TiO2 hydride generation photocatalytic hydride generation (PCHG) system, which is easily separated from the medium. Nano-TiO2 was studied as photocatalyst to reduction of arsenic species by UV-induced with formic acid and atomic absorption detection of different forms of arsenic [As (III), As (V), dimethylarsinic acid (DMA)] in environmental samples (water, sediment and plant). The effect of the average pH, the organic acid concentration, the ultraviolet irradiation time and their amount were investigated...
August 25, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28783410/adsorption-characteristics-of-trace-levels-of-bromate-in-drinking-water-by-modified-bamboo-based-activated-carbons
#19
Ho-Wen Chen, Yen Hsun Chuang, Cheng-Feng Hsu, Winn-Jung Huang
This study was undertaken to investigate the adsorption kinetics and isotherms of bromate (BrO3(-)) on bamboo charcoals that are activated with nitrogen and water vapor. Bamboo-based activated carbon (AC) was dipped in acid and oxidized in a mixture of potassium permanganate and sulfuric acid. Oxidation treatment considerably improved the physicochemical properties of AC, including purity, pore structure and surface nature, significantly enhancing BrO3(-) adsorption capacity. AC with many oxygenated groups and a high mesopore volume exhibited a particularly favorable tendency for BrO3(-) adsorption...
August 7, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28763254/decolorization-of-textile-dyes-in-an-air-lift-bioreactor-inoculated-with-bjerkandera-adusta-obr105
#20
Hong Sodaneath, Jung-In Lee, Seung-Ok Yang, Hyekyeng Jung, Hee Wook Ryu, Kyung-Suk Cho
A new decolorizing white-rot fungus, OBR105, was isolated from Mount Odae in South Korea and identified by the morphological characterization of its fruit body and spores and partial 18s rDNA sequences. The ligninolytic enzyme activity of OBR105 was studied to characterize their decolorizing mechanism using a spectrophotometric enzyme assay. For the evaluation of the decolorization capacity of OBR105, the isolate was incubated in an erlenmeyer flask and in an airlifte bioreator with potato dextrose broth (PDB) medium supplemented with each dye...
August 1, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
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