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Journal of Environmental Sciences (China)

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https://www.readbyqxmd.com/read/30340679/aluminum-formate-af-synthesis-characterization-and-application-in-dye-wastewater-treatment
#1
Moxi Xue, Baoyu Gao, Ruihua Li, Jianzhang Sun
Aluminum formate (AF), a degradable and non-corrosive coagulant, was synthesized from aluminum hydroxide and formic acid. Polyamidine (PA), as a coagulation aid, was combined with AF for dye wastewater treatment. AF was characterized by XPS, FT-IR, viscosity, zeta potential, mass spectrum and XRD, and the flocculation properties of the dual-coagulation system were characterized by FT-IR and SEM. The results showed that COOH, Al2 O3 -Al and O2 -Al bonds were formed in the AF synthesis process, and AF had a higher molecular weight and higher charge neutralization ability than PAC...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340678/uranium-speciation-in-coal-bottom-ash-investigated-via-x-ray-absorption-fine-structure-and-x-ray-photoelectron-spectra
#2
Yinglong Sun, Menxin Wu, Lirong Zheng, Bangda Wang, Yi Wang
Similar to chromium contamination, the environmental contamination caused by uranium in radioactive coal bottom ash (CBA) is primarily dependent on the chemical speciation of uranium. However, the relationship between uranium speciation and environmental contamination has not been adequately studied. To determine the relationship between uranium speciation and environmental contamination, X-ray absorption fine structure (XAFS) and X-ray photoelectron spectra (XPS) analyses were performed to determine the uranium speciation in CBA exposed to different chemical environments and simulated natural environments...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340677/variations-in-concentrations-and-bioavailability-of-heavy-metals-in-rivers-caused-by-water-conservancy-projects-insights-from-water-regulation-of-the-xiaolangdi-reservoir-in-the-yellow-river
#3
Jianwei Dong, Xinghui Xia, Zhining Zhang, Zixuan Liu, Xiaotian Zhang, Husheng Li
Water regulation of the Xiaolangdi Reservoir of the Yellow River was chosen as a case to investigate variations in concentrations and bioavailability of heavy metals caused by water conservancy projects in rivers. Water and suspended sediment (SPS) samples were collected at downstream sampling sites along the river during this period. Concentrations and speciation of Zn, Cr, Cu, Ni, and Pb in water and SPS samples were analyzed, and their bioaccumulation was studied with Daphnia magna. This study indicated that the exchangeable and carbonate-bound fractions of heavy metals in SPS decreased along the studied stretch, and the dissolved heavy metal concentrations increased along the river with 1...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340676/characterization-and-source-analysis-of-indoor-outdoor-culturable-airborne-bacteria-in-a-municipal-wastewater-treatment-plant
#4
Guangsu Xu, Yunping Han, Lin Li, Junxin Liu
The potential health risks of airborne bacteria emission from a wastewater treatment process have been concerned. However, few studies have investigated the differences in community structure between indoor and outdoor bacteria. In this work, the characterization of airborne bacteria was studied in a municipal wastewater treatment plant in Beijing, China. Two indoor (i.e., fine screen room and sludge dewatering house) and two outdoor (i.e., aeration tank and control site) sampling sites were selected. An Andersen six-stage impactor was used for collecting culturable airborne bacteria in the air, and Illumina MiSeq sequencing was conducted to track the emission source of the culturable airborne bacteria...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340675/catalytic-decomposition-performance-for-o-3-and-no-2-in-humid-indoor-air-on-a-mno-x-al-2-o-3-catalyst-modified-by-a-cost-effective-chemical-grafting-method
#5
Longwen Chen, Michel Ondarts, Jonathan Outin, Yves Gonthier, Evelyne Gonze
Processes based on non-thermal plasma (NTP) for indoor air treatment inevitably lead to the formation of toxic by-products such as ozone (O3 ) and nitrogen oxides (NOx ). Adding a step of heterogeneous catalysis in series with NTP could allow for the decomposition of the by-products. Therefore, different catalysts were developed based on transition metal oxides, such as NiOx , CoOx and MnOx with different weight percentage 1, 5 and 10wt.%, deposited on a γ-Al2 O3 support. The O3 removal efficiency (ORE) and the NOx removal efficiency (NRE) were very encouraging in dry air: about 65% and 80%, respectively, by using 2g 5wt...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340674/assessment-of-column-aerosol-optical-properties-using-ground-based-sun-photometer-at-urban-harbin-northeast-china
#6
Qixiang Chen, Yuan Yuan, Xing Huang, Zhihong He, Heping Tan
Aerosol plays a key role in determining radiative balance, regional climate and human health. Severe air pollution over Northeast China in recent years urges more comprehensive studies to figure out the adverse effects caused by excessive aerosols. In this study, column aerosol measurements over urban Harbin, a metropolis located at the highest latitude in Northeast China, during May 2016 to March 2017 were conducted using a CIMEL sun-photometer to analyze local aerosol properties and its variation from different aspects...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340673/seasonal-variation-and-chemical-composition-of-particulate-matter-a-study-by-xps-icp-aes-and-sequential-microanalysis-using-raman-with-sem-eds
#7
Lucy T González, Francisco E Longoria-Rodríguez, Margarita Sánchez-Domínguez, Cesar Leyva-Porras, Karim Acuña-Askar, Boris I Kharissov, Alejandro Arizpe-Zapata, Juan M Alfaro-Barbosa
During the winter period (January-March 2016), the total suspended particles (TSP) and particulate matter smaller than 2.5μm (PM2.5 ) were characterized by the application of various analytical techniques in four zones of the Metropolitan Area of Monterrey in Mexico. To evaluate the seasonal variation of some elements in the particulate matter, the results of this study were compared with those obtained during the summer season (July-September 2015). The speciation of the C1s signal by X-ray photoelectron spectroscopy revealed the contribution of aromatic and aliphatic hydrocarbons as the main components in both seasons...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340672/wastewater-degradation-by-iron-copper-nanoparticles-and-the-microorganism-growth-rate
#8
Tareq W M Amen, Osama Eljamal, Ahmed M E Khalil, Nobuhiro Matsunaga
Nowadays, trends in wastewater treatment by zero-valent iron (ZVI) were turned to use bimetallic NZVI particles by planting another metal onto the ZVI surface to increase its reactivity. Nano size zero-valent iron/copper (NZVI/Cu0 ) bimetallic particles were synthesized in order to examine its toxicity effects on the wastewater microbial life, kinetics of phosphorus, ammonia stripping and the reduction of chemical oxygen demand (COD). Various concentrations of NZVI/Cu0 and operation conditions both aerobic and anaerobic were investigated and compared with pure NZVI experiment...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340671/variations-regularity-of-microorganisms-and-corrosion-of-cast-iron-in-water-distribution-system
#9
Wei Qiu, Weiyu Li, Junguo He, Hongyu Zhao, Xiuming Liu, Yixing Yuan
Corrosion, one of the most common problems of metal pipe for water supply, generally leads to poor water quality, bacteria proliferation, water capacity decrease and other problems. As microorganisms affect corrosion by changing the characteristics of metal surface, the mechanism of microbial corrosion still remains unclear. The corrosion behavior of ductile cast iron is implemented in the dynamic flow and static conditions, in which variations of water quality and microbial community are analyzed in details...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340670/removal-of-arsenite-by-reductive-precipitation-in-dithionite-solution-activated-by-uv-light
#10
Bahngmi Jung, Aya Safan, Yuhang Duan, Vishakha Kaushik, Bill Batchelor, Ahmed Abdel-Wahab
This study investigates the removal of arsenite (As(III)) from water using dithionite activated by UV light. This work evaluated the removal kinetics of As(III) under UV light irradiation as affected by dithionite dose and light intensity, and characterized the nature of the precipitated solids using XPS and SEM-EDS. Photolysis of dithionite was observed by measuring dithionite concentration using UV absorbance at 315nm. This study also investigated the effect of UV light path length on soluble As concentrations to understand resolubilization mechanisms...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340669/natural-continuous-influent-nitrifier-immigration-effects-on-nitrification-and-the-microbial-community-of-activated-sludge-systems
#11
Lifang Yu, Ren Li, Robert Delatolla, Ru Zhang, Xiuling Yang, Dangcong Peng
Two sequencing batch reactors (SBRs) were operated for 100days under aerobic conditions, with one being fed with unsterilized municipal wastewater (USBR), and the other fed with sterilized municipal wastewater (SSBR). Respirometric assays and fluorescence in situ hybridization (FISH) results show that active nitrifiers were present in the unsterilized influent municipal wastewater. The maximum ammonia utilization rate (AUR) and nitrite utilization rate (NUR) of the unsterilized influent were 0.32±0.12mg NH4 + -N/(L·hr) and 0...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340668/magnetic-micro-particle-conditioning-pressurized-vertical-electro-osmotic-dewatering-mpeod-of-activated-sludge-role-and-behavior-of-moisture-and-organics
#12
Xinxin Guo, Xu Qian, Yili Wang, Huaili Zheng
In this study, a magnetic micro-particle conditioning-pressurized vertical electro-osmotic dewatering (MPEOD) process with magnetic micro-particle conditioning-drainage under gravity-mechanical compression-electrical compression (MMPC-DG-MC-EC) stages was established to study the distribution and migration of water, extracellular polymeric substances (EPS), and other organic matter in the activated sludge (AS) matrix at each stage. Results showed that the MPEOD process could attain 53.52% water content (WC) in dewatered AS with bound water (BW) and free water (FW) reduction rates of 82...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340667/the-fate-of-prazosin-and-levonorgestrel-after-electrochemical-degradation-process-monitoring-by-products-using-lc-tof-ms
#13
Fouad Fadhil Al-Qaim, Zainab Haider Mussa, Ali Yuzir, Jalifah Latip, Mohamed Rozali Othman
Prazosin (PRZ) and levonorgestrel (LNG) are widely used as an anti-disease drugs due to their biological activity in the human body. The frequent detection of these compounds in water samples requires alternative technologies for the removal of both compounds. After electrochemical degradation of PRZ and LNG, the parent compounds could be completely removed after treatment, but the identification and characterization of by-products are necessary as well. In this study, the effects of NaCl concentration and applied voltage were investigated during the electrochemical degradation process...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340666/effects-of-surfactants-on-the-combined-toxicity-of-tio-2-nanoparticles-and-cadmium-to-escherichia-coli
#14
Mei Li, Jianchuan Pei, Xiaomeng Tang, Xiaoli Guo
The combined ecological toxicity of TiO2 nanoparticles (nano-TiO2 ) and heavy metals has been paid more attention. As the common pollutants in water environment, surfactants could affect the properties of nanoparticles and heavy metals, and thus further influence the combined toxicity of nano-TiO2 and heavy metals. In this study, the effects of sodium dodecyl benzene sulfonate (SDBS) and Tween 80 on the single and combined toxicities of Cd2+ and nano-TiO2 to Escherichia coli (E. coli) were examined, and the underlying influence mechanism was further discussed...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340665/fluorescence-regional-integration-and-differential-fluorescence-spectroscopy-for-analysis-of-structural-characteristics-and-proton-binding-properties-of-fulvic-acid-sub-fractions
#15
Fanhao Song, Fengchang Wu, Weiying Feng, Zhi Tang, John P Giesy, Fei Guo, Di Shi, Xiaofei Liu, Ning Qin, Baoshan Xing, Yingchen Bai
Structural characteristics and proton binding properties of sub-fractions (FA3 -FA13 ) of fulvic acid (FA), eluted stepwise by pyrophosphate buffer were examined by use of fluorescence titration combined with fluorescence regional integration (FRI) and differential fluorescence spectroscopy (DFS). Humic-like (H-L) and fulvic-like (F-L) materials, which accounted for more than 80% of fluorescence response, were dominant in five sub-fractions of FA. Based on FRI analysis, except the response of F-L materials in FA9 and FA13 , maximum changes in percent fluorescence response were less than 10% as pH was increased from 2...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340664/determination-of-the-effective-density-and-fractal-dimension-of-pm-emissions-from-an-aircraft-auxiliary-power-unit
#16
Emamode A Ubogu, James Cronly, Bhupendra Khandelwal, Swapneel Roy
Gas turbine particulate matter (PM) emissions contribute to air quality degradation and are dangerous to both human health and the environment. Currently, PM mass concentrations determined from gravimetric measurements are the default parameter for gas turbine emissions compliance with PM regulations. The measurement of particle size however, is of significant interest due to its specific effects on health and climate science. The mass concentration can be determined from the number-size distribution measurement but requires the experimental evaluation of effective density of a number of particles to establish the power-law relationship...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340663/enhanced-photocatalytic-degradation-of-lindane-using-metal-semiconductor-zn-zno-and-zno-ag-nanostructures
#17
Hyeon Jin Jung, Ravindranadh Koutavarapu, Seulki Lee, Ju Hyun Kim, Hyun Chul Choi, Myong Yong Choi
To achieve enhanced photocatalytic activity for the degradation of lindane, we prepared metal-semiconductor composite nanoparticles (NPs). Zn@ZnO core-shell (CS) nanocomposites, calcined ZnO, and Ag-doped ZnO (ZnO/Ag) nanostructures were prepared using pulsed laser ablation in liquid, calcination, and photodeposition methods, respectively, without using surfactants or catalysts. The as-prepared catalysts were characterized by using X-ray diffraction (XRD), field-emission scanning electron microscopy, high-resolution transmission electron microscopy, ultraviolet-visible (UV-vis) spectroscopy, and photoluminescence spectroscopy...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340662/a-comparison-of-chemical-msw-compositional-data-between-china-and-denmark
#18
Na Yang, Anders Damgaard, Charlotte Scheutz, Li-Ming Shao, Pin-Jing He
Chemical waste compositions are important for municipal solid waste management, as they determine the pollution potentials from different waste strategies. A representative dataset for chemical characteristics of individual waste fractions is frequently required to assess chemical waste composition, but it is usually reported in developed countries and not in developing countries. In this study, a dataset for Chinese waste was established through careful data screening and assessment, named as CN dataset. Meanwhile, a dataset for Danish waste (DK dataset) was also summarized based on previous studies...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30290877/reduced-graphene-oxide-nano-zero-value-iron-rgo-nzvi-micro-electrolysis-accelerating-cr-vi-removal-in-aquifer
#19
Liming Ren, Jun Dong, Zifang Chi, Huazheng Huang
Nanoscale zero-valent iron (nZVI) assembled on graphene oxide (GO) (rGO-nZVI) composites were synthesized by reduction of GO and ferrous ions with potassium borohydride, for use in Cr(VI) removal from aqueous solution. The results showed that the two-dimensional structure of GO could provide a skeleton support for Fe0 , thus overcoming the bottleneck of aggregation for nZVI. Also, rGO-nZVI would form a ferric-carbon micro-electrolysis system in Cr(VI)-contaminated aquifers, enhancing and accelerating electron transfer, exhibiting high rate and capacity for Cr(VI) removal...
November 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30290876/destratification-and-oxygenation-efficiency-of-a-water-lifting-aerator-system-in-a-deep-reservoir-implications-for-optimal-operation
#20
Yang Li, Tinglin Huang, Xinlin Tan, Zizhen Zhou, Weixing Ma
Thermal stratification is a common phenomenon in lakes and reservoirs and has a significant influence on water quality dynamics. Heihe Reservoir is a canyon-shaped reservoir in Shaanxi Province with strong thermal stratification. Therefore, eight water-lifting aerators (WLAs) were installed in this reservoir, which could overcome thermal stratification and increase oxygenation with gas flows between 20 and 50m3 /hr, and oxygenate the hypolimnion with gas flows less than 20m3 /hr. To examine the destratification efficiency of the WLA system, we used a three-dimensional hydrodynamic module based on MIKE 3 to simulate the thermal structure of Heihe Reservoir and compared the simulations with measured data...
November 2018: Journal of Environmental Sciences (China)
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