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Journal of Environmental Sciences (China)

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https://www.readbyqxmd.com/read/28254063/bioaccumulation-and-the-expression-of-hepatic-cytochrome-p450-genes-in-marine-medaka-oryzias-melastigma-exposed-to-difenoconazole
#1
Lemeng Zhang, Xiaocui Dong, Chonggang Wang, Zhenghong Zuo, Meng Chen
This study was conducted to assess the effects of difenoconazole (DFZ), a triazole fungicide, on the hepatic biotransformation system and its bioaccumulation in marine medaka (Oryzias melastigma). Fish were exposed to DFZ (1, 10, 100, 1000ng/L) for 180days. The results showed that: (1) The mRNA levels of hepatic CYP1A1, CYP1B, CYP1C1, CYP27B and CYP3A40 were up-regulated, but those of CYP3A38 and CYP27A1 were down-regulated. (2) The activity of ethoxyresorufin-O-deethylase (EROD) and the content of reduced glutathione (GSH) in the liver were increased in the DFZ-treated groups, and glutathione S-transferase (GST) activity was increased in the 100 and 1000ng/L groups...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254062/influence-of-agricultural-activities-forest-fires-and-agro-industries-on-air-quality-in-thailand
#2
Worradorn Phairuang, Mitsuhiko Hata, Masami Furuuchi
Annual and monthly-based emission inventories in northern, central and north-eastern provinces in Thailand, where agriculture and related agro-industries are very intensive, were estimated to evaluate the contribution of agricultural activity, including crop residue burning, forest fires and related agro-industries on air quality monitored in corresponding provinces. The monthly-based emission inventories of air pollutants, or, particulate matter (PM), NOx and SO2, for various agricultural crops were estimated based on information on the level of production of typical crops: rice, corn, sugarcane, cassava, soybeans and potatoes using emission factors and other parameters related to country-specific values taking into account crop type and the local residue burning period...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254061/decolorization-of-methyl-orange-by-a-new-clay-supported-nanoscale-zero-valent-iron-synergetic-effect-efficiency-optimization-and-mechanism
#3
Xiaoguang Li, Ying Zhao, Beidou Xi, Xiaoguang Meng, Bin Gong, Rui Li, Xing Peng, Hongliang Liu
In this study, a novel nanoscale zero-valent iron (nZVI) composite material was successfully synthesized using a low-cost natural clay, "Hangjin 2(#) clay" (HJ clay) as the support and tested for the decolorization of the azo dye Methyl Orange (MO) in aqueous solution by nZVI particles. According to the characterization and MO decolorization experiments, the sample with 5:1 HJ clay-supported nZVI (HJ/nZVI) mass ratio (HJ-nZVI5) showed the best dispersion and reactivity and the highest MO decolorization efficiency...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254060/effects-of-sludge-retention-time-carbon-and-initial-biomass-concentrations-on-selection-process-from-activated-sludge-to-polyhydroxyalkanoate-accumulating-cultures
#4
Zhiqiang Chen, Long Huang, Qinxue Wen, Huichao Zhang, Zirui Guo
Four sequence batch reactors (SBRs) fed by fermented sugar cane wastewater were continuously operated under the aerobic dynamic feeding (ADF) mode with different configurations of sludge retention time (SRT), carbon and initial biomass concentrations to enrich polyhydroxyalkanoate (PHA) accumulating mixed microbial cultures (MMCs) from municipal activated sludge. The stability of SBRs was investigated besides the enrichment performance. The microbial community structures of the enriched MMCs were analyzed using terminal restriction fragment length polymorphism (T-RFLP)...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254059/sources-and-distribution-of-sedimentary-organic-matter-along-the-northern-bering-and-chukchi-seas
#5
Fanglu Xu, Haiyan Jin, Zhongqiang Ji, Jianfang Chen, Pei Sun Loh
In this study, lignin-derived phenols were used to determine the sources and distribution of sedimentary organic matter along the northern Bering Sea and Chukchi Sea of the Arctic Ocean. The lignin parameter syringyl/vanillyl (S/V) and cinnamyl/vanillyl (C/V) ratios are used to indicate vegetation sources; and the ratios of vanillic acid/vanillin, (Ad/Al)v and syringic acid/syringaldehyde, (Ad/Al)s are used as indicators of lignin diagenesis. Results showed the predominance of woody gymnosperm signal at the easternmost location in the northern Bering Sea, a mixture of refractory non-woody angiosperm and fresher gymnosperm tissues in the Chukchi Sea, and signal of fresher woody gymnosperm tissues in the northernmost locations in the Chukchi Sea...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254058/modified-adm1-for-modeling-free-ammonia-inhibition-in-anaerobic-acidogenic-fermentation-with-high-solid-sludge
#6
Jie Bai, He Liu, Bo Yin, Huijun Ma, Xinchun Chen
Anaerobic acidogenic fermentation with high-solid sludge is a promising method for volatile fatty acid (VFA) production to realize resource recovery. In this study, to model inhibition by free ammonia in high-solid sludge fermentation, the anaerobic digestion model No. 1 (ADM1) was modified to simulate the VFA generation in batch, semi-continuous and full scale sludge. The ADM1 was operated on the platform AQUASIM 2.0. Three kinds of inhibition forms, e.g., simple inhibition, Monod and non-inhibition forms, were integrated into the ADM1 and tested with the real experimental data for batch and semi-continuous fermentation, respectively...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254057/coupled-effects-of-methane-monooxygenase-and-nitrogen-source-on-growth-and-poly-%C3%AE-hydroxybutyrate-phb-production-of-methylosinus-trichosporium-ob3b
#7
Tingting Zhang, Jiti Zhou, Xiaowei Wang, Yu Zhang
The coupled effects of nitrogen source and methane monooxygenase (MMO) on the growth and poly-β-hydroxybutyrate (PHB) accumulation capacity of methanotrophs were explored. The ammonia-supplied methanotrophs expressing soluble MMO (sMMO) grew at the highest rate, while N2-fixing bacteria expressing particulate MMO (pMMO) grew at the lowest rate. Further study showed that more hydroxylamine and nitrite was formed by ammonia-supplied bacteria containing pMMO, which might cause their slightly lower growth rate...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254056/cadmium-sorption-by-sodium-and-thiourea-modified-zeolite-rich-tuffs
#8
Perfecto Barragán P, M Guadalupe Macedo M, Maria T Olguín
No abstract text is available yet for this article.
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254055/newly-developed-fe3o4-cr2o3-magnetic-nanocomposite-for-photocatalytic-decomposition-of-4-chlorophenol-in-water
#9
Khoirakpam Kesho Singh, Kula Kamal Senapati, Chandan Borgohain, Kanak Chandra Sarma
Chlorophenols, typically 4-chlorophenols are highly toxic and non-biodegradable organic contaminants which pose serious threat to the environment, particularly when released into aqueous medium. The removal of these pollutants by efficient method has received worldwide concern in recent past. A new Fe3O4-Cr2O3 magnetic nanocomposite was synthesized by wet chemical method under ultrasonic irradiation. Microstructure and morphology of the nanocomposite were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and a transmission electron microscope (TEM)...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254054/re-evaluation-of-thyroid-hormone-signaling-antagonism-of-tetrabromobisphenol-a-for-validating-the-t3-induced-xenopus-metamorphosis-assay
#10
Yao Wang, Yuanyuan Li, Zhanfen Qin, Wuji Wei
We developed the T3-induced Xenopus metamorphosis assay, which is supposed to be able to sensitively detect thyroid hormone (TH) signaling disruption of chemicals. The present study aimed to validate the T3-induced Xenopus metamorphosis assay by re-evaluating the TH signaling antagonism of tetrabromobisphenol A (TBBPA), a known TH signaling disruptor. According to the assay we developed, Xenopus tadpoles at stage 52 were exposed to 10-500nmol/L TBBPA in the presence of 1nmol/L T3. After 96hr of exposure, TBBPA in the range of 10-500nmol/L was found to significantly inhibit T3-induced morphological changes of Xenopus tadpoles in a concentration-dependent manner in term of body weight and four morphological endpoints including head area (HA), mouth width (MW), unilateral brain width/brain length (ULBW/BL), and hind-limb length/snout-vent length (HLL/SVL)...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254053/optimization-of-the-t3-induced-xenopus-metamorphosis-assay-for-detecting-thyroid-hormone-signaling-disruption-of-chemicals
#11
Xiaofang Yao, Xiaoying Chen, Yinfeng Zhang, Yuanyuan Li, Yao Wang, Zongming Zheng, Zhanfen Qin, Qingdong Zhang
T3-induced Xenopus metamorphosis is an ideal model for detecting thyroid hormone (TH) signaling disruption of chemicals. To optimize the T3-induced Xenopus assay and improve its sensitivity and reproducibility, we intend to develop quantitatively morphological endpoints and choose appropriate concentrations and exposure durations for T3 induction. Xenopus laevis at stage 52 were exposed to series of concentrations of T3 (0.31-2.5nmol/L) for 6days. By comparing morphological changes induced by T3, we propose head area, mouth width, unilateral brain width/brain length, and hindlimb length/snout-vent length as quantitative parameters for characterizing T3-induced morphological changes, with body weight as a parameter for indicating integrated changes...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254052/accumulation-of-polybrominated-diphenyl-ethers-in-breast-milk-of-women-from-an-e-waste-recycling-center-in-china
#12
Xinghong Li, Yuan Tian, Yun Zhang, Yujie Ben, Quanxia Lv
Polybrominated diphenyl ethers (PBDEs) can be transferred to infants through the ingestion of breast milk, resulting in potential health risk. In this study, PBDEs, hydroxylated polybrominated diphenyl ethers (OH-PBDEs) and 2,2',4,4',5,6'-hexachlorobiphenyl (CB-153) in human milk from women living adjacent to e-waste recycling sites of Wenling, China, were investigated. The median level of PBDEs in samples from residents living in the e-waste recycling environment >20years (R20 group, 19.5ng/g lipid weight (lw)) was significantly higher than that for residents living in Wenling <3years (R3 group, 3...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254051/chemical-characterization-and-source-apportionment-of-atmospheric-submicron-particles-on-the-western-coast-of-taiwan-strait-china
#13
Liming Cao, Qiao Zhu, Xiaofeng Huang, Junjun Deng, Jinsheng Chen, Youwei Hong, Lingling Xu, Lingyan He
Taiwan Strait is a special channel for subtropical East Asian Monsoon and its western coast is an important economic zone in China. In this study, a suburban site in the city of Xiamen on the western coast of Taiwan Strait was selected for fine aerosol study to improve the understanding of air pollution sources in this region. An Aerodyne high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) and an Aethalometer were deployed to measure fine aerosol composition with a time resolution of 5 min from May 1 to 18, 2015...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254050/high-solids-anaerobic-mono-digestion-of-riverbank-grass-under-thermophilic-conditions
#14
Fetra J Andriamanohiarisoamanana, Nobuyuki Matsunami, Takaki Yamashiro, Masahiro Iwasaki, Ikko Ihara, Kazutaka Umetsu
The purpose of this study was to investigate the potential of high-solids anaerobic mono-digestion of riverbank grass under thermophilic conditions, focusing on the effects of the strength and the amount of inoculum. Ensiled grass was inoculated with three different inocula; inoculum from liquid anaerobic digester (LI), inoculum from dry anaerobic digester (DI), and mixture of LI and DI (MI), at feedstock-to-inoculum ratio (FIR) of 1, 2 and 4. The ensiling process of riverbank grass reduced moisture content (p>0...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254049/performance-of-low-temperature-microbial-fuel-cells-mfcs-catalyzed-by-mixed-bacterial-consortia
#15
Olga Tkach, Thangavel Sangeetha, Spiridonova Maria, Aijie Wang
Microbial Fuel Cells (MFCs) are a promising technology for treating wastewater in a sustainable manner. In potential applications, low temperatures substantially reduce MFC performance. To better understand the effect of temperature and particularly how bioanodes respond to changes in temperature, we investigated the current generation of mixed-culture and pure-culture MFCs at two low temperatures, 10°C and 5°C. The results implied that the mixed-culture MFC sustainably performed better than the pure-culture (Shewanella) MFC at 10°C, but the electrogenic activity of anodic bacteria was substantially reduced at the lower temperature of 5°C...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254048/removal-of-hexavalent-chromium-from-contaminated-waters-by-ultrasound-assisted-aqueous-solution-ball-milling
#16
Lin Chen, Zhenhua Chen, Ding Chen, Wei Xiong
Batch mode experiments were conducted to study the removal of hexavalent chromium (Cr(VI)) from aqueous solutions using ultrasound-assisted aqueous solution ball milling. The results show that the reduction rate of Cr(VI) by ultrasound-assisted aqueous solution ball milling was significantly faster than that by ball milling or ultrasound treatment alone, and an initial Cr(VI) concentration of 166mg/L could be decreased to 0.35mg/L at 120min. The decisive factors, including initial concentration of Cr(VI), pH value, ultrasonic frequency and filling gas, were studied...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254047/analysis-of-floc-morphology-in-a-continuous-flow-flocculation-and-sedimentation-reactor
#17
Pengfei Ren, Jun Nan, Xinran Zhang, Kai Zheng
No abstract text is available yet for this article.
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254046/photoelectrochemical-performance-of-birnessite-films-and-photoelectrocatalytic-activity-toward-oxidation-of-phenol
#18
Huiqin Zhang, Hongrui Ding, Xin Wang, Cuiping Zeng, Anhuai Lu, Yan Li, Changqiu Wang
Birnessite films on fluorine-doped tin oxide (FTO) coated glass were prepared by cathodic reduction of aqueous KMnO4. The deposited birnessite films were characterized with X-ray diffraction, Raman spectroscopy, scanning electron microscopy and atomic force microscopy. The photoelectrochemical activity of birnessite films was investigated and a remarkable photocurrent in response to visible light was observed in the presence of phenol, resulting from localized manganese d-d transitions. Based on this result, the photoelectrocatalytic oxidation of phenol was investigated...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254045/polytitanium-sulfate-pts-coagulation-application-and-ti-species-detection
#19
Yanxia Zhao, Sherub Phuntsho, Baoyu Gao, Hokyong Shon
Interest in the development of inorganic polymerized coagulants is growing; however, there are only limited studies on the synthesis of polytitanium coagulants, which are expected to exhibit improved coagulation efficiency with better floc properties. This study presents the synthesis of polytitanium sulfate (PTS) for potential application in water purification, followed by characterization of PTS flocs and titanium species detection. Stable PTS solutions were successfully synthesized and standard jar tests were conducted to evaluate their coagulation efficiency...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28254044/determination-of-urine-derived-odorous-compounds-in-a-source-separation-sanitation-system
#20
Bianxia Liu, Apostolos Giannis, Ailu Chen, Jiefeng Zhang, Victor W C Chang, Jing-Yuan Wang
Source separation sanitation systems have attracted more and more attention recently. However, separate urine collection and treatment could induce odor issues, especially in large scale application. In order to avoid such issues, it is necessary to monitor the odor related compounds that might be generated during urine storage. This study investigated the odorous compounds that emitted from source-separated human urine under different hydrolysis conditions. Batch experiments were conducted to investigate the effect of temperature, stale/fresh urine ratio and urine dilution on odor emissions...
February 2017: Journal of Environmental Sciences (China)
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