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Journal of Environmental Sciences (China)

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https://www.readbyqxmd.com/read/29941273/simulating-the-fate-of-indigenous-antibiotic-resistant-bacteria-in-a-mild-slope-wastewater-polluted-stream
#1
Antonino Fiorentino, Giuliana De Luca, Luigi Rizzo, Giacomo Viccione, Giusy Lofrano, Maurizio Carotenuto
The fate of indigenous surface-water and wastewater antibiotic resistant bacteria in a mild slope stream simulated through a hydraulic channel was investigated in outdoor experiments. The effect of (i) natural (dark) decay, (ii) sunlight, (iii) cloudy cover, (iv) adsorption to the sediment, (v) hydraulic conditions, (vi) discharge of urban wastewater treatment plant (UWTP) effluent and (vii) bacterial species (presumptive Escherichia coli and enterococci) was evaluated. Half-life time (T1/2 ) of E. coli under sunlight was in the range 6...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941272/determination-of-quorum-sensing-signal-substances-in-water-and-solid-phases-of-activated-sludge-systems-using-liquid-chromatography-mass-spectrometry
#2
Yuepeng Sun, Kai He, Qidong Yin, Shinya Echigo, Guangxue Wu, Yuntao Guan
The detection of acyl homoserine lactones (AHLs) in activated sludge is essential for clarifying their function in wastewater treatment processes. An LC-MS/MS method was developed for the detection of AHLs in both the aqueous and solid phases of activated sludge. In addition, the effects of proteases and extracellular polymeric substances (EPS) on the detection of AHLs were evaluated by adding protease inhibitors and extracting EPS, respectively. Recoveries of each AHL were improved by adding 50μL of protease inhibitor, and recoveries were also improved from 0 to 56...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941271/carbon-dioxide-adsorption-and-cycloaddition-reaction-of-epoxides-using-chitosan-graphene-oxide-nanocomposite-as-a-catalyst
#3
Santosh Kumar, Mohmmad Y Wani, Joonseok Koh, João M Gil, Abilio J F N Sobral
One of today's major challenges is to provide green materials for a cleaner environment. We have conducted studies on carbon dioxide (CO2 ) adsorption and conversion to valuable products by an ecofriendly approach based in chitosan/graphene oxide (CSGO) nanocomposite film. Rheological behavior indicates that the CSGO has a better solvation property than the pure chitosan. An adsorption capacity of 1.0152mmolCO2 /g of CSGO nanocomposite at 4.6bar was observed. The catalytic behavior of the CSGO nanocomposite in the presence of tetra-n-butylammonium iodide (n-Bu4 NI) as co-catalyst was evaluated for the cycloaddition of CO2 to epoxides, to give cyclic carbonates, in the absence of any solvent...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941270/tof-sims-surface-analysis-of-chemical-components-of-size-fractioned-urban-aerosols-in-a-typical-heavy-air-pollution-event-in-beijing
#4
Wenjun Li, Hong Li, Jinjuan Li, Xueli Cheng, Zhengzheng Zhang, Fahe Chai, Hao Zhang, Ting Yang, Pengli Duan, Defeng Lu, Yizhen Chen
Size-fractioned atmospheric aerosol particles were collected during a typical heavy air pollution event in Beijing. The organic and inorganic components on the surfaces of the samples were analyzed using time-of-flight secondary ion mass spectrometry (TOF-SIMS). The variation characteristics of the surface chemical composition and influencing factors were studied, and the possible sources of these chemical compositions were identified through principal component analysis. The results showed that inorganic components such as crustal elements and sulfate, and organic components such as aliphatic hydrocarbons and oxygen-containing organic groups were present...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941269/effects-of-c-n-ratio-on-nitrate-removal-and-floc-morphology-of-autohydrogenotrophic-bacteria-in-a-nitrate-containing-wastewater-treatment-process
#5
Tran Ngoc Phu Nguyen, Shu-Ju Chao, Pei-Chung Chen, Chihpin Huang
The effects of C/N ratio of a nitrate-containing wastewater on nitrate removal performed by autohydrogenotrophic bacteria as well as on the morphological parameters of floc such as floc morphology, floc number distribution, mean particle size (MPS), aspect ratio and transparency were examined in this study. The results showed that the nitrate reduction rate increased with increasing C/N ratio from 0.5 to 10 and that the nitrogen removal of up to 95% was found at the C/N ratios of higher than 5 (between 0.5-10)...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941268/association-of-serum-levels-of-perfluoroalkyl-substances-with-gestational-diabetes-mellitus-and-postpartum-blood-glucose
#6
Yuxin Wang, Lei Zhang, Yue Teng, Jiayu Zhang, Lin Yang, Jingguang Li, Jianqiang Lai, Yunfeng Zhao, Yongning Wu
This study was conducted to examine the association of perfluoroalkyl substance (PFAS) exposure with gestational diabetes mellitus (GDM) risk and postpartum fasting blood glucose. We used a 1:2 matched case-control study with 84 GDM subjects and 168 healthy pregnant women from Beijing, China. The maternal blood was collected at 1-2days before delivery, and eight linear isomers and fourteen branched isomers were determined in maternal serum. Logistic regression analyses were performed to evaluate the associations after adjusting for potential confounders...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941267/sulfur-dioxide-and-o-xylene-co-treatment-in-biofilter-performance-bacterial-populations-and-bioaerosols-emissions
#7
Yongli Sun, Song Xue, Lin Li, Wenjie Ding, Junxin Liu, Yunping Han
Sulfur dioxide (SO2 ) and benzene homologs are frequently present in the off-gas during the process of sewage sludge drying. A laboratory scale biofilter was set up to co-treat SO2 and o-xylene in the present study. SO2 and o-xylene could be removed simultaneously in a single biofilter. Their concentration ratio in the inlet stream influenced the removal efficiencies. It is worth noting that the removal of SO2 could be enhanced when low concentrations of o-xylene were introduced into the biofilter. Pseudomonas sp...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941266/development-of-an-on-line-measurement-system-for-water-soluble-organic-matter-in-pm-2-5-and-its-application-in-china
#8
Huiying Li, Xiaofeng Huang, Liming Cao, Yuhong Zhai, Liwu Zeng, Lingyan He
Water-soluble organic matter (WSOM) represents a critical fraction of fine particles (PM2.5 ) in the air, but its changing behaviors and formation mechanisms are not well understood yet, partly due to the lack of fast techniques for the ambient measurements. In this study, a novel system for the on-line measurement of water-soluble components in PM2.5 , the particle-into-liquid sampler (PILS)-Nebulizer-aerosol chemical speciation monitor (ACSM), was developed by combining a PILS, a nebulizer, and an ACSM. High time resolution concentrations of WSOM, sulfate, nitrate, ammonium, and chloride, as well as mass spectra, can be obtained with satisfied quality control results...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941265/long-term-effects-of-sliver-nanoparticles-on-the-abundance-and-activity-of-soil-microbiome
#9
EDITORIAL
Jing Yang Xu, Hongquan Zhang
No abstract text is available yet for this article.
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941264/polar-organic-tracers-in-pm-2-5-aerosols-from-an-inland-background-area-in-southwest-china-correlations-between-secondary-organic-aerosol-tracers-and-source-apportionment
#10
Li Li, Wei Lai, Jinguo Pu, Hengqin Mo, Dongjue Dai, Guilin Wu, Shihuai Deng
PM2.5 aerosol samples were collected over 12 hr and 24 hr intervals in an inland background area, Gongga Mountain National Nature Reserve (hereafter shortened to Gongga), during the summer of 2011. Polar organic tracers, inorganic ions and meteorological data were measured. The purpose of this work was to investigate the variation patterns, formation and sources of the secondary organic aerosol tracers in the studied atmosphere. The average concentrations of isoprene oxidation products, α-pinene oxidation products, β-caryophyllinic acid, sugars, sugar alcohols and anhydrosugars were 88...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941263/distribution-and-sources-of-polycyclic-aromatic-hydrocarbons-and-phthalic-acid-esters-in-water-and-surface-sediment-from-the-three-gorges-reservoir
#11
Li Lin, Lei Dong, Xiaoyang Meng, Qingyun Li, Zhuo Huang, Chao Li, Rui Li, Wenjun Yang, John Crittenden
After the impoundment of the Three Gorges Reservoir (TGR), the hydrological situation of the reservoir has changed greatly. The concentration and distribution of typical persistent organic pollutants in water and sediment have also changed accordingly. In this study, the concentration, distribution and potential sources of 16 polycyclic aromatic hydrocarbons (PAHs) and 6 phthalic acid esters (PAEs) during the water drawdown and impoundment periods were investigated in water and sediment from the TGR. According to our results, PAHs and PAEs showed temporal and spatial variations...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941262/relationship-between-physicochemical-properties-and-dewaterability-of-hydrothermal-sludge-derived-from-different-source
#12
Xiuzheng Zhuang, Yanqin Huang, Huacai Liu, Hongyou Yuan, Xiuli Yin, Chuangzhi Wu
Sewage sludge (SS) and deinking sludge (DS) were used to comparatively study the hydrothermal dewatering of sludge with different components. For a better overview, an insight into the relationship between physicochemical properties and dewaterability of hydrothermal sludge was provided. Results found that not all kinds of sludge were suitably conditioned by hydrothermal treatment (HT) in term of the elevation of dewaterability. Higher hydrothermal temperature tended to enhance the dewaterability of SS rather than DS, which was supported by the variation of their physicochemical properties (including water distribution, bonding energy, extracellular polymeric substance (EPS), particles size, acid functional groups and zeta potential in this study)...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941261/formation-process-and-mechanism-of-humic-acid-kaolin-complex-determined-by-carbamazepine-sorption-experiments-and-various-characterization-methods
#13
Fei Wang, Jiangtao He, Baonan He, Xiaojing Zhu, Xiaocui Qiao, Liuyue Peng
To explore the formation process and mechanism of organic matter and organic-mineral complex under humification and mineralization conditions, a series of samples including humic acid, kaolin, and humic acid-kaolin complex were prepared using a subcritical water treatment method (SWT) under specific temperature, pressure and reaction time conditions. HA was used as a surrogate for natural organic matter because it has a similar abundant pore structure, variety of carbon types, and chemical components. These samples were used in carbamazepine (CBZ) sorption experiments and characterized by a variety of techniques...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941260/phosphine-production-in-anaerobic-wastewater-treatment-under-tetracycline-antibiotic-pressure
#14
Meiqing Lu, Xiaojun Niu, Weiyi Chen, Zhu Liang, Sheng You, Xiaohong Gu
The influence of tetracycline (TC) antibiotics on phosphine (PH3 ) production in the anaerobic wastewater treatment was studied. A lab-scale anaerobic baffled reactor with three compartments was employed to simulate this process. The reactor was operated in a TC-absence wastewater and 250μg/L TC-presence wastewater for three months after a start-up period, respectively. The responses of pH, oxidation-reduction potential (ORP), chemical oxygen demand (COD), total phosphorus (TP), enzymes activity (dehydrogenase and acid phosphatase), and microbial community were investigated to reveal the effect of TC on PH3 production...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941259/using-x-ray-computed-tomography-and-micro-raman-spectrometry-to-measure-individual-particle-surface-area-volume-and-morphology-towards-investigating-atmospheric-heterogeneous-reactions
#15
Mingjin Wang, Nan Zheng, Tong Zhu, Jing Shang, Ting Yu, Xiaojuan Song, Defeng Zhao, Yong Guan, Yangchao Tian
Heterogeneous reactions on the aerosol particle surface in the atmosphere play important roles in air pollution, climate change, and global biogeochemical cycles. However, the reported uptake coefficients of heterogeneous reactions usually have large variations and may not be relevant to real atmospheric conditions. One of the major reasons for this is the use of bulk samples in laboratory experiments, while particles in the atmosphere are suspended individually. A number of technologies have been developed recently to study heterogeneous reactions on the surfaces of individual particles...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941258/production-and-characterization-of-bioaerosols-for-model-validation-in-spacecraft-environment
#16
Anniina Salmela, Eero Kokkonen, Ilpo Kulmala, Anna-Maria Veijalainen, Rob van Houdt, Natalie Leys, Audrey Berthier, Ilyin Viacheslav, Sergey Kharin, Julia Morozova, Alexander Tikhomirov, Pertti Pasanen
This study aimed to evaluate the suitability of two bioaerosol generation systems (dry and wet generation) for the aerosolization of microorganisms isolated from the International Space Station, and to calibrate the produced bioaerosols to fulfill the requirements of computational fluid dynamics model (CFD) validation. Concentration, stability, size distribution, agglomeration of generated bioaerosol and deposition of bioaerosols were analyzed. In addition, the dispersion of non-viable particles in the air was studied...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941257/preliminary-investigation-on-cytotoxicity-of-fluorinated-polymer-nanoparticles
#17
Xue Wang, Wenge Cheng, Qiuyuan Yang, Hongyun Niu, Qian Liu, Yun Liu, Ming Gao, Ming Xu, An Xu, Sijin Liu, Xiaoyu Huang, Yuguo Du
As well-known persistent organic pollutants (POPs), organofluorine pollutants such as perfluorooctane sulfonate (PFOS) have been proven to be bioaccumulated and harmful to health. However, toxicological assessment of organofluorinated nanoparticles, which have emerged as a novel tool for biomedical and industrial applications, is lacking, to the best of our knowledge. To assess the biological effects and health risk of fluorinated nanoparticles, trifluoroethyl aryl ether-based fluorinated poly(methyl methacrylate) nanoparticles (PTFE-PMMA NPs) were synthesized with various fluorine contents (PTFE-PMMA-1 NPs 12...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941256/removal-of-vocs-from-gas-streams-with-double-perovskite-type-catalysts
#18
Kuan Lun Pan, Guan Ting Pan, Siewhui Chong, Moo Been Chang
Double perovskite-type catalysts including La2 CoMnO6 and La2 CuMnO6 are first evaluated for the effectiveness in removing volatile organic compounds (VOCs), and single perovskites (LaCoO3 , LaMnO3 , and LaCuO3 ) are also tested for comparison. All perovskites are tested with the gas hourly space velocity (GHSV) of 30,000hr-1 , and the temperature range of 100-600°C for C7 H8 removal. Experimental results indicate that double perovskites have better activity if compared with single perovskites. Especially, toluene (C7 H8 ) can be completely oxidized to CO2 at 300°C as La2 CoMnO6 is applied...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941255/characterization-of-bacterial-community-and-iron-corrosion-in-drinking-water-distribution-systems-with-o-3-biological-activated-carbon-treatment
#19
Xueci Xing, Haibo Wang, Chun Hu, Lizhong Liu
Bacterial community structure and iron corrosion were investigated for simulated drinking water distribution systems (DWDSs) composed of annular reactors incorporating three different treatments: ozone, biologically activated carbon and chlorination (O3 -BAC-Cl2 ); ozone and chlorination (O3 -Cl2 ); or chlorination alone (Cl2 ). The lowest corrosion rate and iron release, along with more Fe3 O4 formation, occurred in DWDSs with O3 -BAC-Cl2 compared to those without a BAC filter. It was verified that O3 -BAC influenced the bacterial community greatly to promote the relative advantage of nitrate-reducing bacteria (NRB) in DWDSs...
July 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29941254/recovery-of-cu-ii-from-aqueous-solution-by-induced-crystallization-in-a-long-term-operation
#20
Zhimou Wei, Ya Xiong, Jian Chen, Jing Bai, Jing Wu, Jiane Zuo, Kaijun Wang
The feasibility of copper recovery by induced crystallization in a long period (174days) was investigated in a seeded fluidized bed reactor (FBR). The process was divided into 3 periods according to different influent conditions, and the period III was separated into III-a and III-b due to the adjustment of the molar ratio of CO3 2- concentration to copper concentration ([CT ]/[Cu2+ ]). The removal efficiency could exceed 95% and the average effluent copper concentration decreased to 3.0mg/L. The mean particle size of seed grains with copper crystals coating on, raised to 0...
July 2018: Journal of Environmental Sciences (China)
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