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Journal of Environmental Sciences (China)

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https://www.readbyqxmd.com/read/28571875/structure-and-flow-calculation-of-cake-layer-on-microfiltration-membranes
#1
Yadong Yu, Zhen Yang, Yuanyuan Duan
Submerged membrane bioreactors (SMBR) are widely used in wastewater treatment. The permeability of a membrane declines rapidly because of the formation of a cake layer on the membrane surface. In this paper, a multiple staining protocol was conducted to probe the four major foulants in the cake layer formed on a filtration membrane. Fluorescent images of the foulants were obtained using a confocal laser scanning microscope (CLSM). The three dimensional structure of the cake layer was reconstructed, and the internal flow was calculated using computational fluid dynamics (CFD)...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571874/organic-ligand-induced-dissolution-kinetics-of-antimony-trioxide
#2
Xingyun Hu, Mengchang He
The influence of low-molecular-weight dissolved organic matter (LMWDOM) on the dissolution rate of Sb2O3 was investigated. Some representative LMWDOMs with carboxyl, hydroxyl, hydrosulfuryl and amidogen groups occurring naturally in the solution were chosen, namely oxalic acid, citric acid, tartaric acid, EDTA, salicylic acid, phthalandione, glycine, thiolactic acid, xylitol, glucose and catechol. These LMWDOMs were dissolved in inert buffers at pH=3.7, 6.6 and 8.6 and added to powdered Sb2O3 in a stirred, thermostatted reactor (25°C)...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571873/biosynthesis-of-gold-nanoparticles-by-trichoderma-sp-wl-go-for-azo-dyes-decolorization
#3
Yuanyuan Qu, Wenli Shen, Xiaofang Pei, Fang Ma, Shengnan You, Shuzhen Li, Jingwei Wang, Jiti Zhou
Developing an eco-friendly approach for metallic nanoparticles synthesis is important in current nanotechnology research. In this study, green synthesis of gold nanoparticles (AuNPs) was carried out by a newly isolated strain Trichoderma sp. WL-Go. UV-vis spectra of AuNPs showed a surface plasmon resonance peak at 550nm, and transmission electron microscopy images revealed that the AuNPs were of varied shape with well dispersibility. The optimal conditions for AuNPs synthesis were HAuCl4 1.0mmol/L, biomass 0...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571872/achieving-partial-nitrification-by-inhibiting-the-activity-of-nitrospira-like-bacteria-under-high-do-conditions-in-an-intermittent-aeration-reactor
#4
Peng Bao, Shuying Wang, Bin Ma, Qiong Zhang, Yongzhen Peng
It is generally accepted that a low dissolved oxygen (DO) concentration is more beneficial for achieving partial nitrification than high-DO. In this study, partial nitrification was not established under low-DO conditions in an intermittent aeration reactor for treating domestic wastewater. During the operational period of low-DO conditions (DO: 0.3±0.14mg/L), stable complete nitrification was observed. The abundance of Nitrospira-like bacteria, which were the major nitrite-oxidizing bacteria, increased from 1...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571871/case-study-of-dust-event-sources-from-the-gobi-and-taklamakan-deserts-an-investigation-of-the-horizontal-evolution-and-topographical-effect-using-numerical-modeling-and-remote-sensing
#5
Jin Fan, Xiaoying Yue, Qinghua Sun, Shigong Wang
A severe dust event occurred from April 23 to April 27, 2014, in East Asia. A state-of-the-art online atmospheric chemistry model, WRF/Chem, was combined with a dust model, GOCART, to better understand the entire process of this event. The natural color images and aerosol optical depth (AOD) over the dust source region are derived from datasets of moderate resolution imaging spectroradiometer (MODIS) loaded on a NASA Aqua satellite to trace the dust variation and to verify the model results. Several meteorological conditions, such as pressure, temperature, wind vectors and relative humidity, are used to analyze meteorological dynamic...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571870/numerical-simulation-study-on-air-quality-in-aircraft-cabins
#6
Yingjie Zhao, Bingrong Dai, Qi Yu, Haiqing Si, Gang Yu
Air pollution is one of the main factors that affect the air quality in aircraft cabins, and the use of different air supply modes could influence the distribution of air pollutants in cabins. Based on the traditional ceiling air supply mode used on the B737NG, this study investigated another 3 different kinds of air supply modes for comparison: luggage rack air supply mode, joint mode combining ceiling and luggage rack air supply, and joint mode combining ceiling and individual air supply. Under the above 4 air supply modes, the air velocity, temperature and distribution of air pollutants in a cabin full of passengers were studied using computational fluid dynamics (CFD), and carbon dioxide (CO2) and formaldehyde were selected as 2 kinds of representative air pollutants...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571869/simulated-reaction-of-formaldehyde-and-ambient-atmospheric-particulate-matter-using-a-chamber
#7
Yueyue Chen, Jia Liu, Jing Shang, Tong Zhu
The reaction of HCHO with Beijing winter's real ambient particulate matter (PM) inside a 3.3m(3) Teflon Chamber was conducted in this study. NO2, O3 and H2O gases were removed from the ambient aerosol before entering into the chamber. The decays of HCHO were monitored (acetylacetone spectrophotometry method) during the reactions at different PM number concentrations (Na) and relative humidities (RHs), and the formed particulate formate was detected by IC and XPS techniques. The results showed that when RH was 10%-15%, the decay rate of HCHO in the chamber was higher with the existence of PM from relatively clean days (with number concentration (Na)<200,000particle/L, 0...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571868/genotoxicity-of-drinking-water-treated-with-different-disinfectants-and-effects-of-disinfection-conditions-detected-by-umu-test
#8
Xuebiao Nie, Wenjun Liu, Liping Zhang, Qing Liu
The genotoxicity of drinking water treated with 6 disinfection methods and the effects of disinfection conditions were investigated using the umu-test. The pretreatment procedure of samples for the umu-test was optimized for drinking water analysis. The results of the umu-test were in good correlation with those of the Ames-test. The genotoxicity and production of haloacetic acids (HAAs) were the highest for chlorinated samples. UV+chloramination is the safest disinfection method from the aspects of genotoxicity, HAA production and inactivation effects...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571867/arsenic-speciation-in-fish-from-greek-coastal-areas
#9
Ioanna Kalantzi, Kyriaki Mylona, Katerina Sofoulaki, Manolis Tsapakis, Spiros A Pergantis
Arsenic speciation analysis was conducted on fish samples (sardine and anchovy) collected from six areas along the Greek coastline, i.e. Artemisium Straits, Thermaikos Gulf, Amvrakikos Gulf, Strymonian Gulf, Thracian Sea, and Elefsina Gulf. Total arsenic levels ranging from 11.8 to 62.6mg As/kg dry weight were determined. Arsenobetaine, a non-toxic form of arsenic, was found to be the main arsenic species, present at 8.6 to 58.8mg As/kg dry weight, accounting for 67-95% of the total arsenic. Also detected in all fish samples was dimethylarsinic acid, although at considerably lower concentrations, ranging from 0...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571866/the-influence-of-environmental-factors-on-the-carbon-dioxide-flux-across-the-water-air-interface-of-reservoirs-in-south-eastern-poland
#10
Renata Gruca-Rokosz, Lilianna Bartoszek, Piotr Koszelnik
Studies concerning the emission of carbon dioxide (CO2) were carried out in 2009-2012 for six reservoirs located in four provinces of south-eastern Poland. The CO2 flux across the water-air interface was measured using the "static chamber" method. The measured fluxes of CO2 (FCO2) ranged from -30.64 to 183.78mmol/m(2)/day, and the average values varied in the range from -3.52 to 82.11mmol/m(2)/day. In most of the cases, emission of CO2 to the atmosphere was observed. The obtained values of CO2 fluxes were comparable to values typical for other temperate reservoirs...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571865/mobilization-of-arsenic-from-contaminated-sediment-by-anionic-and-nonionic-surfactants
#11
Chuan Liang, Xianjia Peng
The increasing manufacture of surfactants and their wide application in industry, agriculture and household detergents have resulted in large amounts of surfactant residuals being discharged into water and distributed into sediment. Surfactants have the potential to enhance arsenic mobility, leading to risks to the environment and even human beings. In this study, batch and column experiments were conducted to investigate arsenic mobilization from contaminated sediment by the commercial anionic surfactants sodium dodecylbenzenesulfonate (SDBS), sodium dodecyl sulfate (SDS), sodium laureth sulfate (AES) and nonionic surfactants phenyl-polyethylene glycol (Triton X-100) and polyethylene glycol sorbitan monooleate (Tween-80)...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571864/inhibition-effects-of-perfluoroalkyl-acids-on-progesterone-production-in-mltc-1
#12
Wei Zhao, Ruina Cui, Jianshe Wang, Jiayin Dai
Perfluoroalkyl substances (PFASs) are a class of fluorine substituted carboxylic acid, sulfonic acid and alcohol, structurally similar to their corresponding parent compounds. Previous study demonstrated the potential endocrine disruption and reproductive toxicity of perfluorooctane sulfonic acid and perfluorooctanoic acid, two dominant PFASs in animals and humans. We explored the relationship between eleven perfluoroalkyl acids (PFAAs) with different carbon chain length and their ability to inhibit progesterone production in mouse Leydig tumor cells (mLTC-1)...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571863/an-insight-into-the-removal-of-fluoroquinolones-in-activated-sludge-process-sorption-and-biodegradation-characteristics
#13
Lu Wang, Zhimin Qiang, Yangang Li, Weiwei Ben
The detailed sorption steps and biodegradation characteristics of fluoroquinolones (FQs) including ciprofloxacin, enrofloxacin, lomefloxacin, norfloxacin, and ofloxacin were investigated through batch experiments. The results indicate that FQs at a total concentration of 500μg/L caused little inhibition of sludge bioactivity. Sorption was the primary removal pathway of FQs in the activated sludge process, followed by biodegradation, while hydrolysis and volatilization were negligible. FQ sorption on activated sludge was a reversible process governed by surface reaction...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571862/zeolite-a-synthesized-from-alkaline-assisted-pre-activated-halloysite-for-efficient-heavy-metal-removal-in-polluted-river-water-and-industrial-wastewater
#14
Qingpeng Meng, Hong Chen, Junzhong Lin, Zhang Lin, Junliang Sun
High quality zeolite A was synthesized through a hydrothermal process using alkaline-assisted pre-activated halloysite mineral as the alumina and silica source. The synthesis conditions employed in this study were finely tuned by varying the activating temperature, sodium hydroxide content, water content and Si/Al ratio. The obtained zeolite A showed excellent adsorption properties for both single metal cation solutions and mixed cation solutions when the concentrations of the mixed cations were comparable with those in polluted natural river water and industrial wastewater...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571861/high-throughput-metagenomic-analysis-of-petroleum-contaminated-soil-microbiome-reveals-the-versatility-in-xenobiotic-aromatics-metabolism
#15
Yun-Juan Bao, Zixiang Xu, Yang Li, Zhi Yao, Jibin Sun, Hui Song
The soil with petroleum contamination is one of the most studied soil ecosystems due to its rich microorganisms for hydrocarbon degradation and broad applications in bioremediation. However, our understanding of the genomic properties and functional traits of the soil microbiome is limited. In this study, we used high-throughput metagenomic sequencing to comprehensively study the microbial community from petroleum-contaminated soils near Tianjin Dagang oilfield in eastern China. The analysis reveals that the soil metagenome is characterized by high level of community diversity and metabolic versatility...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571860/pollution-characteristics-of-polycyclic-aromatic-hydrocarbons-in-common-used-mineral-oils-and-their-transformation-during-oil-regeneration
#16
Xiaohui Wu, Bo Yue, Yi Su, Qi Wang, Qifei Huang, Qunhui Wang, Hongying Cai
The pollution characteristic of polycyclic aromatic hydrocarbons (PAHs) in common used mineral oils, semi-refined oils, refined oils and solid wastes produced during the used mineral oil regeneration process was analyzed. The results showed that total PAHs content in six common used mineral oils was as follows: used engine oil>used quenching oil>used casting oil>used hydraulic oil>used antirust oil>used industrial lubricating oil. Furthermore, this order was dependent on the source of PAHs and oil working temperatures...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571859/development-of-a-method-for-comprehensive-water-quality-forecasting-and-its-application-in-miyun-reservoir-of-beijing-china
#17
Lei Zhang, Zhihong Zou, Wei Shan
Water quality forecasting is an essential part of water resource management. Spatiotemporal variations of water quality and their inherent constraints make it very complex. This study explored a data-based method for short-term water quality forecasting. Prediction of water quality indicators including dissolved oxygen, chemical oxygen demand by KMnO4 and ammonia nitrogen using support vector machine was taken as inputs of the particle swarm algorithm based optimal wavelet neural network to forecast the whole status index of water quality...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571858/effects-of-silver-adsorbed-on-fumed-silica-silver-phosphate-glass-bentonite-organomodified-with-silver-and-titanium-dioxide-in-aquatic-indicator-organisms
#18
Daiane Tomacheski, Michele Pittol, Douglas Naue Simões, Vanda Ferreira Ribeiro, Ruth Marlene Campomanes Santana
In order to reduce the level of transmission of diseases caused by bacteria and fungi, the development of antimicrobial additives for use in personal care, hygiene products, clothing and others has increased. Many of these additives are based on metals such as silver and titanium. The disposal of these products in the environment has raised concerns pertaining to their potential harmfulness for beneficial organisms. The objective of this study was to evaluate the influence of the shape, surface chemistry, size and carrier of three additives containing silver and one with titanium dioxide (TiO2) on microcrustacean survival...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571857/identification-of-long-range-transport-pathways-and-potential-sources-of-pm2-5-and-pm10-in-beijing-from-2014-to-2015
#19
Deping Li, Jianguo Liu, Jiaoshi Zhang, Huaqiao Gui, Peng Du, Tongzhu Yu, Jie Wang, Yihuai Lu, Wenqing Liu, Yin Cheng
Trajectory clustering, potential source contribution function (PSCF) and concentration-weighted trajectory (CWT) methods were applied to investigate the transport pathways and identify potential sources of PM2.5 and PM10 in different seasons from June 2014 to May 2015 in Beijing. The cluster analyses showed that Beijing was affected by trajectories from the south and southeast in summer and autumn. In winter and spring, Beijing was not only affected by the trajectories from the south and southeast, but was also affected by trajectories from the north and northwest...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28571856/ag-agbr-tio2-rgo-nanocomposite-synthesis-characterization-photocatalytic-activity-and-aggregation-evaluation
#20
Penghua Wang
Ag-AgBr/TiO2 supported on reduced graphene oxide (Ag-AgBr/TiO2/RGO) with different mass ratios of grapheme oxide (GO) to TiO2 were synthesized via a facile solvothermal-photo reduction method. Compared to the single-, two- and three-component nanocomposites, the four-component nanocomposite, Ag-AgBr/TiO2/RGO-1 with mass ratio of GO to TiO2 at 1%, exhibited a much higher photocatalytic activity for the degradation of penicillin G (PG) under white light-emitting diode (LED-W) irradiation. The PG degradation efficiency increased with the increase of mass ratio of GO to TiO2 from 0...
June 2017: Journal of Environmental Sciences (China)
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