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https://www.readbyqxmd.com/read/28240536/stratification-of-extracellular-polymeric-substances-eps-for-aggregated-anammox-microorganisms
#1
Fangxu Jia, Qing Yang, Xiuhong Liu, Xiyao Li, Baikun Li, Liang Zhang, Yongzhen Peng
Sludge aggregation and biofilm formation are the most effective approaches to solve the washout of anammox microorganisms. In this study, the structure and composition of EPS (extracellular polymeric substances) were investigated to elucidate the factors for the anammox aggregation property. Anammox sludge taken from 18 lab-scale and pilot-scale reactors treating different types of wastewater was analyzed using EEM-PARAFAC (excitation-emission matrix and parallel factor analysis), FTIR (fourier transform infrared spectroscopy) and real-time PCR combined with multivariate statistical analysis...
February 27, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28199788/development-of-fluorescence-surrogates-to-predict-the-photochemical-transformation-of-pharmaceuticals-in-wastewater-effluents
#2
Shuwen Yan, Bo Yao, Lushi Lian, Xinchen Lu, Shane A Snyder, Rui Li, Weihua Song
The photochemical transformation of pharmaceutical and personal care products (PPCPs) in wastewater effluents is an emerging concern for environmental scientists. In the current study, the photodegradation of 29 PPCPs was examined in effluents under simulated solar irradiation. Direct photodegradation, triplet state effluent organic matter ((3)EfOM*)-mediated and hydroxyl radical (HO(•))-mediated degradation are three major pathways in the removal process. With the photodegradation of trace levels of PPCPs, the excitation-emission matrix (EEM) fluorescence intensities of the effluents were also gradually reduced...
February 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28162032/production-of-soluble-microbial-products-in-aerobic-granular-sludge-system-under-the-stress-of-toxic-4-chlorophenol
#3
Heng Dong, Dong Wei, Siyu Wang, Xiaodong Wang, Tao Yan, Liangguo Yan, Bin Du, Qin Wei
The purpose of this study was to evaluate the effect of toxic 4-chlorophenol (4-CP) on the production of soluble microbial products (SMP) in aerobic granular sludge system. Compared with control experiment, NH4(+)-N removal efficiency generally reduced by 37.90% after the exposure of 4-CP of 10 mg L(-1), indicating that 4-CP had a toxic effect on the performance of biological nitrification. Meanwhile, the contents of polysaccharides (PS) and proteins (PN) of SMP increased from 31.0±0.32 and 0.8±0.12 mg L(-1) to 39...
February 6, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28113066/transformation-of-dissolved-organic-matter-in-concentrated-leachate-from-nanofiltration-during-ozone-based-oxidation-processes-o3-o3-h2o2-and-o3-uv
#4
Hua-Wei Wang, Xiao-Yue Li, Zhi-Peng Hao, Ying-Jie Sun, Ya-Nan Wang, Wei-Hua Li, Yiu Fai Tsang
In this study, the transformation of dissolved organic matter (DOM) in nanofiltration concentrated leachate during three ozone-based oxidation processes (i.e., O3, O3/H2O2 and O3/UV) was investigated. The transformation characteristics of DOM were evaluated by gel filtration chromatography (GFC), XAD-8 resin fractionation, excitation-emission matrix fluorescence spectroscopy (EEM) and Fourier transform infrared spectroscopy (FTIR). Compared with O3-alone process, the removal efficiencies of COD, TOC, and color were improved in O3-combined processes (i...
January 19, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28109718/lipid-core-burden-response-to-stent-implantation-assessed-with-near-infrared-spectroscopy-and-intravascular-ultrasound-evaluation-in-patients-with-myocardial-infarction
#5
Manijeh Noori, Per Thayssen, Karsten Tange Veien, Anders Junker, Knud Nørregaard Hansen, Henrik Steen Hansen, Lisette Okkels Jensen
INTRODUCTION: Near-infrared spectroscopy (NIRS) is a new method to identify lipid core plaque (LCP). The LCP and vascular response were assessed with NIRS to examine whether LCP was compressed or redistributed during percutaneous coronary intervention with stent implantation. METHODS: In 25 patients with non-ST segment elevation myocardial infarction (NSTEMI) NIRS acquisition was performed after predilation, stent implantation with nominal pressure and high-pressure post-dilation with a non-compliant balloon...
December 27, 2016: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28091994/source-analysis-of-organic-matter-in-swine-wastewater-after-anaerobic-digestion-with-eem-parafac
#6
Zhuo Zeng, Ping Zheng, Aqiang Ding, Meng Zhang, Ghulam Abbas, Wei Li
Swine wastewater is one of the most serious pollution sources, and it has attracted a great public concern in China. Anaerobic digestion technology is extensively used in swine wastewater treatment. However, the anaerobic digestion effluents are difficult to meet the discharge standard. The results from batch experiments showed that plenty of refractory organic matter remained in the effluents after mesophilic anaerobic digestion for 30 days. The effluent total COD (tCOD) and soluble COD (sCOD) were 483 and 324 mg/L, respectively, with the sCOD/tCOD ratio of 0...
January 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28091530/the-autofluorescence-characteristics-of-bacterial-intracellular-and-extracellular-substances-during-the-operation-of-anammox-reactor
#7
Xiaolin Hou, Sitong Liu, Ying Feng
Anammox is a cost-effective process to treat nitrogenous wastewater. In this work, excitation-emission matrix (EEM) fluorescence spectroscopy was used to characterize the intracellular and extracellular substances of anammox sludge during reactor operation of 276 days. Four main fluorophores were identified from the intracellular substances. Two main protein-like fluorophores were identified from the extracellular substances. Correlation analysis revealed that intracellular 420 peak and humic-like peak had strong correlation with nitrogen removal rate...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28088716/unveiling-the-transformation-and-bioavailability-of-dissolved-organic-matter-in-contrasting-hydrothermal-vents-using-fluorescence-eem-parafac
#8
Liyang Yang, Wan-E Zhuang, Chen-Tung Arthur Chen, Bing-Jye Wang, Fu-Wen Kuo
The submarine hydrothermal systems are extreme environments where active cycling of dissolved organic matter (DOM) may occur. However, little is known about the optical properties and bioavailability of hydrothermal DOM, which could provide valuable insights into its transformation processes and biogeochemical reactivity. The quantity, quality, and bioavailability of DOM were investigated for four very different hydrothermal vents east of Taiwan, using dissolved organic carbon (DOC), absorption spectroscopy, and fluorescence excitation-emission matrices-parallel factor analysis (EEM-PARAFAC)...
January 3, 2017: Water Research
https://www.readbyqxmd.com/read/28088531/the-effect-of-dissolved-organic-matter-on-soybean-peroxidase-mediated-removal-of-triclosan-in-water
#9
Jianhua Li, Ya Zhang, Jianbiao Peng, Xinan Wu, Shixiang Gao, Liang Mao
Dissolved organic matter (DOM) is ubiquitous in water and involved in numerous important chemical processes in aqueous systems, enabling it a unique challenge for a variety of water treatment processes. Soybean peroxidase (SBP)-based enzymatic process, as a promising treatment technique, has been successfully applied to remove pollutants in wastewaters such as coal-tar and refinery wastewater. In this study, the effect of DOM on the removal of polychlorinated aromatic antimicrobials triclosan (TCS) by SBP was investigated...
April 2017: Chemosphere
https://www.readbyqxmd.com/read/28061748/complete-chloroplast-genome-of-gracilaria-firma-gracilariaceae-rhodophyta-with-discussion-on-the-use-of-chloroplast-phylogenomics-in-the-subclass-rhodymeniophycidae
#10
Poh-Kheng Ng, Showe-Mei Lin, Phaik-Eem Lim, Li-Chia Liu, Chien-Ming Chen, Tun-Wen Pai
BACKGROUND: The chloroplast genome of Gracilaria firma was sequenced in view of its role as an economically important marine crop with wide industrial applications. To date, there are only 15 chloroplast genomes published for the Florideophyceae. Apart from presenting the complete chloroplast genome of G. firma, this study also assessed the utility of genome-scale data to address the phylogenetic relationships within the subclass Rhodymeniophycidae. The synteny and genome structure of the chloroplast genomes across the taxa of Eurhodophytina was also examined...
January 6, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28042892/the-characterization-of-dissolved-organic-matter-extracted-from-different-sources-and-their-influence-on-cadmium-uptake-by-microcystis-aeruginosa
#11
Lixiao Ni, Lili Su, Shiyin Li, Peifang Wang, Dandan Li, Xiang Ye, Yi Li, Yong Li, Yiping Li, Chao Wang
This study examines the uptake of the heavy metal cadmium (Cd) by Microcystis aeruginosa (M. aeruginosa) in the presence of dissolved organic matter (DOM) from different origins. The DOM used in this study were extracted from soil, sediment taken from Meiliang Bay at Taihu Lake and from M. aeruginosa cultured in the laboratory. The three different DOM were characterized using UV-visible absorption spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The excitation-emission matrix (EEM) fluorescence spectroscopy was used to characterize the interactions of DOM with Cd(2+) ...
January 2, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28039829/effects-of-zno-nanoparticle-exposure-on-wastewater-treatment-and-soluble-microbial-products-smps-in-an-anoxic-aerobic-membrane-bioreactor
#12
Dong Qing Zhang, Chin Yee Eng, David C Stuckey, Yan Zhou
The effect of zinc oxide nanoparticles (ZnO NPs) on the performance of an anoxic-aerobic submerged membrane bioreactor (MBR), and the characterization of the soluble microbial products (SMPs) produced in the presence of ZnO NPs was evaluated. Continuous operation over 144 days showed that ZnO NPs at concentrations of 10 and 50 mg/L exerted a negative impact on chemical oxygen demand (COD) and nitrogen removal, although ZnO NPs were efficiently removed in the MBR (>92%). 10 and 50 mg/L ZnO NPs decreased COD removal substantially from 93...
December 21, 2016: Chemosphere
https://www.readbyqxmd.com/read/28034431/algal-uptake-of-dissolved-organic-nitrogen-in-wastewater-treatment-plants
#13
Jingtian Zhang, Mingzhou Su, Beidou Xi, Guangren Qian, Jianyong Liu, Fei Hua, Shouliang Huo
The algal uptake of dissolved organic nitrogen (DON) in the anaerobic-anoxic-oxic (A2O) process was investigated in this study. Anaerobic, aerobic and effluent DON samples from two wastewater treatment plants (WWTPs) were separated into hydrophilic and hydrophobic fractions using a DAX-8 resin coupled with an anion exchange resin and a nanofiltration (NF) pretreatment. Hydrophilic DON accounted for 66.66%-88.74% of the entire DON for the two plants evaluated. After a 15-day incubation, 16.95%-91.75% DON was bioavailable for algal growth, and untreated samples exhibited higher DON bioavailability, with 52...
December 2016: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28027526/probing-the-intracellular-organic-matters-released-from-the-photocatalytic-inactivation-of-bacteria-using-fractionation-procedure-and-excitation-emission-matrix-fluorescence
#14
Guocheng Huang, Tsz Wai Ng, Taicheng An, Guiying Li, Dehua Xia, Ho Yin Yip, Huijun Zhao, Po Keung Wong
Photocatalysis provides a "green" and effective strategy for water disinfection. During the photocatalytic disinfection process, intracellular organic matter (IOM) from bacterial cells may be released into the bulk solution. In this study, the role of released IOM in the photocatalytic bacterial inactivation was investigated by fractionation procedure and fluorescence excitation-emission-matrix (EEM) combined with parallel factor analysis (PARAFAC) approaches. The normal bacterial cells treated by TiO2-UVA in the presence and absence with fractionated IOM results implied that the released IOM would be either absorbed on the surface of the photocatalysts or reacted by the photo-generated reactive species, and thereby affecting the kinetics of photocatalytic bacterial inactivation...
December 21, 2016: Water Research
https://www.readbyqxmd.com/read/28024243/extinction-emission-and-scattering-spectroscopy-of-5-50-nm-citrate-coated-gold-nanoparticles-an-argument-for-curvature-effects-on-aggregation
#15
Milad Rabbani Esfahani, Vasanta L Pallem, Holly A Stretz, Martha J M Wells
The interaction of macromolecules with gold nanoparticles (GNPs) is of interest in the emerging field of biomedical and environmental detection devices. However, the physicochemical properties, including spectra, of GNPs in aqueous solution in the absence of metal-macromolecular interactions must first be considered before their activity in biological and environmental systems can be understood. The specific objective of this research was to experimentally illuminate the role of nanoparticle core size on the spectral (simultaneous consideration of extinction, emission, and scattering) versus aggregation behaviors of citrate-coated GNPs (CT-GNPs)...
March 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28009500/anthropogenic-influences-of-paved-runoff-and-sanitary-sewage-on-the-dissolved-organic-matter-quality-of-wet-weather-overflows-an-excitation-emission-matrix-parallel-factor-analysis-assessment
#16
Hao Chen, Zhen-Liang Liao, Xian-Yong Gu, Jia-Qiang Xie, Huai-Zheng Li, Jin Zhang
The quality of dissolved organic matter (DOM) in a wet weather overflow (WWF) can be broadly influenced by anthropogenic factors, such as nonpoint sources of paved runoff and point sources of sanitary sewage within the drainage networks. This study focused on the anthropogenic influences of the paved runoff and sanitary sewage on the DOM quality of WWF using excitation-emission matrix parallel factor analysis (EEM-PARAFAC). Results show that (1) EEM-PARAFAC fitted terrestrial humic-like, anthropogenic humic-like, tryptophan-like, and tyrosine-like components can be regarded as indicators to identify the types of sewage overflows and the illicit connection status of drainage systems...
January 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/27995508/spatio-temporal-variability-of-fluorescent-dissolved-organic-matter-in-the-rh%C3%A3-ne-river-delta-and-the-fos-marseille-marine-area-nw-mediterranean-sea-france
#17
Nicolas Ferretto, Marc Tedetti, Catherine Guigue, Stéphane Mounier, Patrick Raimbault, Madeleine Goutx
The spatio-temporal variability of fluorescent dissolved organic matter (FDOM) and its relationships with physical (temperature, salinity) and chemical (nutrients, chlorophyll a, dissolved and particulate organic carbon, nitrogen and phosphorus) parameters were investigated in inland waters of the Rhône River delta and the Fos-Marseille marine area (northwestern Mediterranean, France). Samples were taken approximately twice per month in two inland sites and three marine sites from February 2011 to January 2012...
December 19, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27992371/relation-between-baseline-plaque-features-and-subsequent-coronary-artery-remodeling-determined-by-optical-coherence-tomography-and-intravascular-ultrasound
#18
Zulong Xie, Nana Dong, Rong Sun, Xinxin Liu, Xia Gu, Yong Sun, Hongwei Du, Jiannan Dai, Youbin Liu, Jingbo Hou, Jinwei Tian, Bo Yu
Atherosclerosis often leads to myocardial infarction and stroke. We examined the influence of baseline plaque characteristics on subsequent vascular remodeling in response to changes in plaque size. Using optical coherence tomography (OCT) and intravascular ultrasound (IVUS), we examined 213 plaques from 138 patients with acute coronary syndrome at baseline and repeated IVUS at the 12-month follow-up. The change in external elastic membrane (EEM) area for each 1 mm2 change in plaque area (i.e., the slope of the regression line) was calculated as a measure of vascular remodeling capacity...
December 15, 2016: Oncotarget
https://www.readbyqxmd.com/read/27988469/comparative-study-of-the-role-of-extracellular-polymeric-substances-in-biosorption-of-ni-ii-onto-aerobic-anaerobic-granular-sludge
#19
Na Li, Dong Wei, Shaotong Wang, Lihua Hu, Weiying Xu, Bin Du, Qin Wei
This study was carried out to comparatively evaluate the role of extracellular polymeric substances (EPS) in biosorption of Ni(II) onto aerobic/anaerobic granular sludge (AGS and AnGS). Batch sorption experiments data suggested that Ni(II) sorption onto AGS and AnGS were better fitted to Langmuir and Freundlich model, respectively. The contribution of EPS in the sorption of AnGS was higher than that of AGS. Interaction between EPS and Ni(II) was investigated by a combined three-dimensional excitation-emission matrix (3D-EEM), synchronous fluorescence spectra, two-dimensional correlation spectroscopy (2D-COS) and fourier transform infrared spectroscopy (FTIR)...
December 7, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27987445/assessment-of-phytotoxicity-grade-during-composting-based-on-eem-parafac-combined-with-projection-pursuit-regression
#20
Hong-Yang Cui, Yue Zhao, Yan-Ni Chen, Xu Zhang, Xue-Qin Wang, Qian Lu, Li-Ming Jia, Zi-Min Wei
Improper treatment of organic waste may result in environmental pollution and harm to plant growth due to the high concentration of phytotoxin. Composting has widely been used for recycling organic waste and reducing phytotoxin to improve soil properties. Assessing the phytotoxicity grades of compost products is essential for achieving high quality compost to guarantee its marketability. In this study, a technique combined parallel factor (PARAFAC) of excitation-emission matrices (EEMs) spectroscopy with projection pursuit regression (PPR) was applied to improve the sensitivity of phytotoxicity assessment during composting...
December 11, 2016: Journal of Hazardous Materials
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