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Journal of Environmental Sciences (China)

Sungwoon Jung, Jounghwa Kim, Jeongsoo Kim, Dahee Hong, Dongjoo Park
The objective of this study is to estimate the vehicle kilometer traveled (VKT) and on-road emissions using the traffic volume in urban. We estimated two VKT; one is based on registered vehicles and the other is based on traffic volumes. VKT for registered vehicles was 2.11 times greater than that of the applied traffic volumes because each VKT estimation method is different. Therefore, we had to define the inner VKT is moved VKT inner in urban to compare two values. Also, we focused on freight modes because these are discharged much air pollutant emissions...
April 2017: Journal of Environmental Sciences (China)
Gabrio Valotto, Giancarlo Rampazzo, Francesco Gonella, Gianni Formenton, Silvia Ficotto, Giorgia Giraldo
n-Alkanes and polycyclic aromatic hydrocarbons (PAHs) bound to atmospheric particulate matter (PM1) were investigated in a traffic site located in an urban area of Venice Province (Eastern Po Valley, Italy) during the cold season. Considering the critical situation affecting the Veneto Region concerning the atmospheric pollution and the general lack of information on PM1 composition and emission in this area, this experimental study aims at determining the source profile, their relative contributions and the dispersion of finer particles...
April 2017: Journal of Environmental Sciences (China)
Alice Bosco-Santos, Wanilson Luiz-Silva, Emmanoel Vieira da Silva-Filho, Monique Dias Corrêa de Souza, Elton Luiz Dantas, Margareth Sugano Navarro
Fractionation of rare earth elements (REE) and other trace metal concentrations (Th, U, Cd, Cr, Cu, Ni, Pb, and Zn) between mangrove sediments and claw muscles and shells of male crabs (Ucides cordatus) from a subtropical estuary highly impacted by fertilizer industry activities was investigated. This is the first record of REE distribution in these organisms, and the results showed higher accumulations of these metals, U and Th in shells, probably related to the replacement of Ca during molting. Contents of Cd, Cr and Ni were similar in both tissues, but Cu, Zn and Pb were mostly accumulated in the claw muscle with concentrations above those considered safe for human consumption according to the Brazilian legislation...
April 2017: Journal of Environmental Sciences (China)
Zohra Ben Salem, Xavier Laffray, Ahmed Al-Ashoor, Habib Ayadi, Lotfi Aleya
The uptake of metals in roots and their transfer to rhizomes and above-ground plant parts (stems, leaves) of cattails (Typha latifolia L.) were studied in leachates from a domestic landfill site (Etueffont, France) and treated in a natural lagooning system. Plant parts and corresponding water and sediment samples were taken at the inflow and outflow points of the four ponds at the beginning and at the end of the growing season. Concentrations of As, Cd, Cr, Cu, Fe, Mn, Ni and Zn in the different compartments were estimated and their removal efficiency assessed, reaching more than 90% for Fe, Mn and Ni in spring and fall as well in the water compartment...
April 2017: Journal of Environmental Sciences (China)
Qi Yu, Dongbin Wei, Wei Liu, Yuguo Du
Benzophenones (BPs), a group of widely used UV filters, exert multiple, significant toxicity effects. The 11 BPs were selected as target compounds, and the photobacterium acute toxicity test and an index for acute toxicity formation potential (ATFP) were used to evaluate the toxicity variation of BPs before and after a photoinduction-chlorination disinfection process. Orthogonal experiments were performed at different pH values and chlorine dosages. The characteristics of ATFP values for 11 BPs after a photoinduction-chlorination process can be summarized as follows: (1) The ATFPs decreased as the hydroxyl group number increased in BPs molecules...
April 2017: Journal of Environmental Sciences (China)
Yue Sun, Peng Zuo, Junfen Luo, Rajendra Prasad Singh
Two novel weakly basic anion exchange resins (SZ-1 and SZ-2) were prepared via the reaction of macroporous chloromethylated polystyrene-divinylbenzene (Cl-PS-DVB) beads with dicyclohexylamine and piperidine, respectively. The physicochemical structures of the resulting resins were characterized using Fourier Transform Infrared Spectroscopy and pore size distribution analysis. The adsorption behavior of SZ-1 and SZ-2 for benzenesulfonic acid (BA) was evaluated, and the common commercial weakly basic anion exchanger D301 was also employed for comparison purpose...
April 2017: Journal of Environmental Sciences (China)
Hongwei Wu, Qiyan Feng
As an effective conventional absorbent, biochar exhibited limited adsorption ability toward small hydrophobic molecules. To enhance the adsorption capacity, a novel adsorbent was prepared by immobilizing nanoscale zero-valent iron onto modified biochar (MB) and then the elemental silver was attached to the surface of iron (Ag/Fe/MB). It's noted that spherical Ag/Fe nanoparticles with diameter of 51nm were highly dispersed on the surface of MB. As the typical hydrophobic contaminant, carbon tetrachloride was selected for examining the removal efficiency of the adsorbent...
April 2017: Journal of Environmental Sciences (China)
Minjun Chen, Ben Li, Nan Sang
Epidemiological studies have shown that particulate matter 2.5 (PM2.5) not only increases the incidence of cardiopulmonary illnesses but also relates to the development of neurodegenerative diseases. Considering that PM2.5 is highly heterogeneous with regional disparity and seasonal variation, we investigated whether PM2.5 exposure induced neuronal apoptosis and synaptic injuries in a season-dependent manner. The results indicated that PM2.5 altered the expression of apoptosis-related proteins (mainly bax and bcl-2), activated caspase-3 and caused neuronal apoptosis...
April 2017: Journal of Environmental Sciences (China)
Yun Cheng, Yang Zhang, Qiuxuan Shen, Jie Gao, Guoqiang Zhuang, Xuliang Zhuang
N-acyl-homoserine lactones (AHLs) serve as quorum-sensing signals, which control a number of bacterial processes in many proteobacteria. Here we report the effects of exogenous short-chain AHL on the denitrifying process of Paracoccus denitrificans, which are capable of aerobic and anaerobic growth by utilizing nitrate. The denitrification activity of these cells was monitored by measuring denitrification products (including nitrate, nitrite, and nitrous oxide), and the individual messenger ribonucleic acid (mRNA) levels of nitrate, nitrite, nitric oxide and nitrous oxide reductases...
April 2017: Journal of Environmental Sciences (China)
Yan Ma, Yi Shi, Deyi Hou, Xi Zhang, Jiaqi Chen, Zhifen Wang, Zhu Xu, Fasheng Li, Xiaoming Du
Mechanical soil aeration is a simple, effective, and low-cost soil remediation technology that is suitable for sites contaminated with volatile chlorinated hydrocarbons (VCHs). Conventionally, this technique is used to treat the mixed soil of a site without considering the diversity and treatability of different soils within the site. A laboratory test was conducted to evaluate the effectiveness of mechanical soil aeration for remediating soils of different textures (silty, clayey, and sandy soils) along a vertical profile at an abandoned chloro-alkali chemical site in China...
April 2017: Journal of Environmental Sciences (China)
Chun Tu, Fadong Li
Understanding the effects of warming on greenhouse gas (GHG, such as N2O, CH4 and CO2) feedbacks to climate change represents the major environmental issue. However, little information is available on how warming effects on GHG fluxes in farmland of North China Plain (NCP). An infrared warming simulation experiment was used to assess the responses of N2O, CH4 and CO2 to warming in wheat season of 2012-2014 from conventional tillage (CT) and no-tillage (NT) systems. The results showed that warming increased cumulative N2O emission by 7...
April 2017: Journal of Environmental Sciences (China)
Pusheng Zhao, Yina Chen, Jie Su
A MOUDI-120 sampler was used in Beijing to collect multi-stage samples in the summer and winter of 2013 to 2015. Thirty-three sample sets were collected during the daytime, nighttime, and different pollution levels. The actual relative humidity in the impactors was calculated for the first time. The carbonaceous components (organic and elemental carbon, OC and EC, respectively) and water-soluble inorganic ions (Na(+), NH4(+), K(+), Mg(2+), Ca(2+), Cl(-), NO3(-), and SO4(2-)) were analyzed in each sample. The characteristics of the mass concentration distribution and charge balance were discussed...
April 2017: Journal of Environmental Sciences (China)
Xiaohui Wu, Bo Yue, Qifei Huang, Qi Wang, Ye Lin, Wei Zhang, Zhuoyi Yan
Variation of CH4, CO2, and O2 concentrations in layers of different depths in semi-aerobic and anaerobic landfills was analyzed over a period of 5years. The results showed that most of the municipal solid waste became basically stable after 5years of landfill disposal. In the upper and middle layer, the concentration of CH4 in the semi-aerobic landfill was significantly lower than that in the anaerobic landfill in different landfill periods, while in the lower layer, there was little difference in the CH4 concentration between the semi-aerobic and anaerobic landfills...
April 2017: Journal of Environmental Sciences (China)
Li Zhu, Yiqing Zeng, Shule Zhang, Jinli Deng, Qin Zhong
A series of cobalt doped TiO2 (Co-TiO2) and CoOx loaded TiO2 (Co/TiO2) catalysts prepared by sol-gel and impregnation methods respectively were investigated on selective catalytic reduction with NH3 (NH3-SCR) of NO. It was found that Co-TiO2 catalyst showed more preferable catalytic activity at low temperature range. From characterization results of XRD, TEM, Raman and FT-IR, Co species were proved to be doped into TiO2 lattice by replaced Ti atoms. After being characterized and analyzed by NH3-TPD, PL, XPS, EPR and DRIFTS, it was found that the better NH3-SCR activities of Co-TiO2 catalysts, compared with Co/TiO2 catalyst, were ascribed to the formation of more oxygen vacancies which further promoted the production of more superoxide ions (O2(-))...
April 2017: Journal of Environmental Sciences (China)
Olga Sacco, Vincenzo Vaiano, Diana Sannino, Paolo Ciambelli
A novel visible light-active photocatalyst formulation (NdT/OP) was obtained by supporting N-doped TiO2 (NdT) particles on up-conversion luminescent organic phosphors (OP). The photocatalytic activity of such catalysts was evaluated for the mineralization process of spiramycin in aqueous solution. The effect of NdT loading in the range 15-60wt.% on bulk and surface characteristics of NdT/OP catalysts was investigated by several chemico-physical characterization techniques. The photocatalytic performance of NdT/OP catalysts in the removal of spyramicin from aqueous solution was assessed through photocatalytic tests under visible light irradiation...
April 2017: Journal of Environmental Sciences (China)
Mahabubur Chowdhury, Sipiwe Shoko, Fransciuos Cummings, Veruscha Fester, Tunde Victor Ojumu
In this work, we have shown that mining waste derived Fe(3+) can be used to enhance the photocatalytic activity of TiO2. This will allow us to harness a waste product from the mines, and utilize it to enhance TiO2 photocatalytic waste water treatment efficiency. An organic linker mediated route was utilized to create a composite of TiO2 and biogenic jarosite. Evidence of FeOTi bonding in the TiO2/jarosite composite was apparent from the FTIR, EFTEM, EELS and ELNEFS analysis. The as prepared material showed enhanced photocatalytic activity compared to pristine TiO2, biogenic jarosite and mechanically mixed sample of jarosite and TiO2 under both simulated and natural solar irradiation...
April 2017: Journal of Environmental Sciences (China)
Jia Liu, Wei Zuo, Jun Zhang, Hui Li, Lipin Li, Yu Tian
The chemical oxygen demand (COD) and NH3-N removal, membrane fouling, sludge characteristics and microbial community structure in a membrane bioreactor (MBR) coupled with worm reactors (SSBWR) were evaluated for 210days. The obtained results were compared to those from a conventional MBR (C-MBR) operated in parallel. The results indicated that the combined MBR (S-MBR) achieved higher COD and NH3-N removal efficiency, slower increase in membrane fouling, better sludge settleability and higher activities of the related enzymes in the activated sludge...
April 2017: Journal of Environmental Sciences (China)
Xiaolong Liu, Meng Ye, Xue Wang, Wen Liu, Tingyu Zhu
The activated carbon injection-circulating fluidized bed (ACI-CFB)-bag filter coupling technique was studied in an iron ore sintering plant. For comparison, the removal efficiencies under the conditions without or with ACI technology were both evaluated. It was found that the polychlorinated dibenzo-p-dioxins and dibenzofuran (PCDD/F) removal efficiency for total international toxic equivalence quantity (I-TEQ) concentration was improved from 91.61% to 97.36% when ACI was employed, revealing that ACI was very conducive to further controlling the PCDD/F emissions...
April 2017: Journal of Environmental Sciences (China)
Bihuang Xie, Xuchun Li, Xianfeng Huang, Zhe Xu, Weiming Zhang, Bingcai Pan
Halogenated aromatic compounds have attracted increasing concerns due to their toxicity and persistency in the environment, and dehalogenation is one of the promising treatment and detoxification methods. Herein, we systematically studied the debromination efficiency and mechanism of para-bromophenol (4-BP) by a recently developed UV/sulfite process. 4-BP underwent rapid degradation with the kinetics accelerated with the increasing sulfite concentration, pH (6.1-10) and temperature, whereas inhibited by dissolved oxygen and organic solvents...
April 2017: Journal of Environmental Sciences (China)
Tania Pérez-Pérez, Gleyce Teixeira Correia, Wu Hong Kwong, Ileana Pereda-Reyes, Deny Oliva-Merencio, Marcelo Zaiat
As a support material, zeolite can be used to promote the granulation process due to its high settable property and the ability to retain biomass on its surface. The present paper reports on the influence of zeolite addition on the hydrodynamic behavior of an expanded granular sludge bed reactor (EGSB). Different models were applied to fit the flow pattern and to compare EGSB hydrodynamic performance with and without the addition of zeolite. The experimental data fit the tanks in a series model for zeolite bed height of 5cm and upflow velocity of 6m/hr...
April 2017: Journal of Environmental Sciences (China)
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