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Gao P.-P.,Southwest Jiaotong University | Li Y.-Z.,Sichuan Academy of Environmental science | Guo X.-J.,Chengdu University of Information Technology | Huang T.,Southwest Jiaotong University | And 2 more authors.
Wetlands | Year: 2017

Dissolved organic matter (DOM), chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP) collected from a water intake and a water outlet in a constructed rapid infiltration (CRI) system were investigated. The results indicated a relatively high microbially derived DOM and an increasing humification degree of DOM in the CRI treatment process. The removal rates of dissolved organic carbon (DOC), COD and TN ranged from 15.2 to 74.6%, 58.9 to 80.4% and 44.8 to 73.8%, respectively. TP concentrations showed a marked increase from inflow to outflow. Fluorescence regional integration (FRI) analysis showed that tyrosine-like materials (PI, n) were easily biodegraded, compared to humic- and fulvic-like substances, whose removal rates ranged from 78.4–90.6%. The tryptophan-like materials (PII, n) showed a marked decrease, in the range of 56.1–79.3%. The humic-like substances (PV, n) had relatively low removal rates in the range of 0.3 to 50.9%. The COD, TN, and DOC were positively correlated with the various Pi, n values and negatively correlated with the humification degree, indicating that the COD, TN and DOC decreased with the degradation of DOM and the increase of DOM humification degree. © 2017 Society of Wetland Scientists

Bai Y.,Southwest Jiaotong University | Guo X.-J.,Chengdu University of Information Technology | Li Y.-Z.,Sichuan Academy of Environmental Science | Huang T.,Southwest Jiaotong University
AMB Express | Year: 2017

Microbial induced carbonate precipitation (MICP) is a common occurrence of geochemistry influences in many fields, such as biological, geographical, and engineering systems. However, the processes that control interactions between carbonate biomineralization and biofilm properties are poorly understood. We develop a method for real time, in situ and nondestructive imaging with confocal scanning microscopy. This method provides a possible way to observe biomineralization process and the morphology of biomineralized deposits within biofilms. We use this method to show calcite biominerals produced by Pseudomonas aeruginosa biofilms which extremely change biofilm structures. The distribution of calcite precipitation produced in situ biomineralization is highly heterogeneous in biofilms and also to occur primarily on the bottom of biofilms. It is distinct from those usual expectations that mineral started to precipitate from surface of biofilm. Our results reveal that biomineralization plays a comprehensive regulation function on biofilm architecture and properties. © 2017, The Author(s).

Li S.,University of Sichuan | Li S.,Sichuan Academy of Environmental science | Hu X.,University of Sichuan | Tang Y.,University of Sichuan | And 2 more authors.
Quaternary International | Year: 2014

Jiuzhaigou National Nature Reserve in southwest China is listed as a World Natural Heritage Site and has numerous alpine and subalpine travertine lakes. Over the past 240 years, agricultural expansion, tourism enhancement and other human activities have resulted in land use and land cover change. In this study, sediment cores from three lakes in Jiuzhaigou were collected to track the nature and intensity of these human activities in Jiuzhaigou as well as determine the influences of human activities on the lacustrine environment. Total organic carbon (TOC), total phosphorus (TP), total nitrogen (TN), carbon to nitrogen ratio (C/N), biogenic silica (BSi), heavy metal elements and other indicators were used to trace the evolution of the lacustrine sedimentary environment in Jiuzhaigou. The increased intensity in agricultural activities, large-scale deforestation, unsustainable tourism and other activities was clearly identified in the lake sediment records. Ecological restoration and decreased travel disturbance would reduce the levels of the various eutrophic substances and heavy metal elements in the lacustrine environment. Studying and understanding the response of lacustrine environment to human activities is of great significance for the protection and sustainable use of water and landscapes in the mountain lakes of Jiuzhaigou. © 2014 Elsevier Ltd and INQUA.

PubMed | Sichuan Academy of Environmental science, SAE Technology Development Dongguan Co., Core Technology Integrated Beijing Pty. Ltd., Shaanxi University and 3 more.
Type: | Journal: Journal of environmental sciences (China) | Year: 2016

Atmospheric aerosol particle samples were collected using an Ambient Eight Stage (Non-Viable) Cascade Impactor Sampler in a typical urban area of Beijing from 27th Sep. to 5th Oct., 2009. The surface chemistry of these aerosol particles was analyzed using Static Time of Flight-Secondary Ion Mass Spectrometry (Static TOF-SIMS). The factors influencing surface compositions were evaluated in conjunction with the air pollution levels, meteorological factors, and air mass transport for the sampling period. The results show that a variety of organic ion groups and inorganic ions/ion groups were accumulated on the surfaces of aerosol particles in urban areas of Beijing; and hydrophobic organic compounds with short- or middle-chain alkyl as well as hydrophilic secondary inorganic compounds were observed. All these compounds have the potential to affect the atmospheric behavior of urban aerosol particles. PM1.1-2.1 and PM3.3-4.7 had similar elements on their surfaces, but some molecules and ionic groups demonstrated differences in Time of Flight-Secondary Ion Mass Spectrometry spectra. This suggests that the quantities of elements varied between PM1.1-2.1 and PM3.3-4.7. In particular, more intense research efforts into fluoride pollution are required, because the fluorides on aerosol surfaces have the potential to harm human health. The levels of air pollution had the most significant influence on the surface compositions of aerosol particles in our study. Hence, heavier air pollution was associated with more complex surface compositions on aerosol particles. In addition, wind, rainfall, and air masses from the south also greatly influenced the surface compositions of these urban aerosol particles.

Cao S.,Chinese Research Academy of Environmental Sciences | Duan X.,Chinese Research Academy of Environmental Sciences | Zhao X.,Chinese Research Academy of Environmental Sciences | Chen Y.,Chinese Research Academy of Environmental Sciences | And 5 more authors.
Chemosphere | Year: 2016

Rapid development of industrialization and urbanization results in serious environmental contamination by metal(loid)s, which would consequently cause deleterious health effects to the exposed people through multi-pathways. Therefore, total health risk assessment for the population in urban environment is very important. Unfortunately, few studies to date investigate the cumulative health risks of metal(loid)s through aggregative pathways in Children who are often susceptible population. 12 metal(loid)s including Lead(Pb), Cadmium(Cd), Arsenic(As), Chromium(Cr), Zinc(Zn), Copper(Cu), Nickel(Ni), Manganese(Mn), Cobalt(Co), Selenium(Se), Antimony(Se) and Vanadium(V), were analyzed in PM10, drinking water, food, soil and indoor dust in this study. The cumulative and aggregative risks of these metal(loid)s among the local children were then evaluated on a field sampling and questionnaire-survey basis. The results showed that the environments were heavily polluted by metal(loid)s. For most metal(loid)s, food ingestion accounted for more than 80% of the total daily exposure dose. The non-cancer risks were up to 30 times higher than the acceptable level due to the food ingestion via Pb, Cr, Cu, Zn, As, Se, Cd and Sb, and the PM10 inhalation via Cr and Mn. While, the cancer risks were mainly attributed to Cr via food ingestion and As via food and dust ingestion, and approximately 100 times of the maximum acceptable level of 1.0 × 10-4. The study highlights the cumulative and aggregative exposure assessment, instead of pollutant investigation to evaluate the potential health risks and emphasizes concerns to improve indoor hygienic and environmental quality and to decrease the potential harmful health effects of children living in urban area. © 2016 Elsevier Ltd.

Li Y.Z.,Sichuan Academy of Environmental Science | Yao Y.,Sichuan Environment and Engineering Appraisal Center | Peng D.P.,Southwest Jiaotong University | Ye H.,Sichuan Academy of Environmental Science
Advanced Materials Research | Year: 2013

Recently, the groundwater heavy metal pollution is becoming more and more serious with the development of economy of China. In order to analyze the effect of lead zinc ore has on groundwater of the Southwest Mining District, after considering characteristics of heavy metal pollution, groundwater anti-fouling ability of natural selection, aquifer intrinsic vulnerability and drinking water source protection area, the groundwater environmental effect of a lead zinc ore is assessed and discussed. © (2013) Trans Tech Publications, Switzerland.

Qiu Z.-P.,Southwest Jiaotong University | Jiang H.-T.,Southwest Jiaotong University | Wang Q.,Southwest Jiaotong University | Liu Y.-Y.,Sichuan Academy of Environmental science | And 2 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2012

Based on the study of different effects of function-specialized microbes on the degradation of leachate and stabilization of landfill, a group of complex functional microbes were constructed to accelerate the stabilization of landfill. The complex flora had the greatest influences on the indices of leachate than other combined ones. The three indices including leachate volume, COD and concentration of ammonia nitrogen firstly reached the peak values at the initial stage of landfill then dropped apparently, and the values of three indices kept lower than those of other groups after 49d, 30d and 44d respectively. Moreover, the concentration of ammonia nitrogen reduced to less than 10 mg/L after 130d, which meet the requirements of ammonia nitrogen discharge of leachate according to GB16889-2008. In the whole period of landfill, cumulative volume of leachate, the total mass of COD and ammonia nitrogen were 26.66%, 26.59% and 25.40% lower than those of control groups respectively. This indicated that the pollution load of landfill was declined. Moreover, this complex flora also affected the indices of refuse stabilization most greatly. In contrast to the control groups, the concentrations of TOC, TN and C/N of refuse landfill decreased by 39.6%, 18.9% and 25.4% respectively at the end of landfill, while the settlement rate of waste and the biodegradation rate of organics increased by 9.99% and 26.23% respectively.

He M.,Sichuan Academy of Environmental science | Wang X.-R.,Sichuan Academy of Environmental science | Han L.,Sichuan Academy of Environmental science | Feng X.-Q.,Sichuan Academy of Environmental science | Mao X.,Sichuan Academy of Environmental science
Huanjing Kexue/Environmental Science | Year: 2015

Based on the collected activity data, the 2012 emission inventory of crop residues field burning in Sichuan province was developed through the emission factor approach. Besides, the temporal and spatial distribution of pollutant emissions was also analysed in this paper. The results showed that the total emissions of SO2, NOx, NH3, CH4, NMVOC, CO, PM2.5, EC and OC from crop residues field burning in Sichuan province in the year of 2012 were 1210, 12185, 2827, 20659, 40463, 292671, 39277, 1984 and 10215 t, respectively; The rice straw, wheat straw, com straw and oil rape straw were four major contributors to pollutant emissions, with a total contribution about 88%-94%; Crop residues field burning emissions were affected by agricultural harvesting. Temporally, the emissions were concentrated in July and August with a small peak in May; Spatially, the Chengdu plain, the Northern area and the Eastern area of Sichuan province were the highest emission areas, while the Western area had relatively low emissions; The key uncertain sources included emission factors and parameters used for estimating crop burning amounts. ©, 2015, Science Press. All right reserved.

Zheng J.,Zhejiang University | Zhao Y.,Zhejiang University | Lu Q.,Zhejiang University | Deng J.,University of Sichuan | And 2 more authors.
Engineering Geology | Year: 2016

Rock mass classification systems are common tools used in the design and construction of rock engineering. Numerous classification systems have been developed for rock slopes, of which the Slope Mass Rating (SMR) system is the most popular. Consequently, many rock slope classification systems have been derived from the SMR system. However, these systems are not good at determining the values of the two adjustment parameters F1 and F3, implying that the original SMR system may contain theory defects. In this paper, we propose some corrected methods for determining F1 and F3 and perform a series of analyses considering the three failure modes of rock slopes: plane, wedge, and toppling failures. The results of the discrepancy analysis from F1 illustrate that, with respect to each of the aforementioned three failure modes the calculated original SMR index is larger than, or equal to, the real value, and the designed slope is possibly in danger. The results of the discrepancy caused by the F3 illustrate that for each of the aforementioned three failure modes, the calculated original SMR index is smaller than, or equal to, the real value, and the designed slope might be conservative and not economical. © 2016 Elsevier B.V.

Deng T.,Tianjin University of Science and Technology | Wu Y.,Sichuan Academy of Environmental science | Yu X.,Tianjin University of Science and Technology | Guo Y.,Tianjin University of Science and Technology | And 2 more authors.
Applied Geochemistry | Year: 2014

Arsenic species including arsenite, arsenate, and organic arsenic were measured in the porewaters collected from Poyang Lake, the largest freshwater lake of China. The vertical distributions of dissolved arsenic species and some diagenetic constituents [Fe(II), Mn(II), S(-II)] were also obtained in the same porewater samples in summer and winter. In sediments the concentration profiles of total As and As species bound to Fe-Mn oxyhydroxides and to organic matter were also determined along with the concentrations of Fe, Mn and S in different extractable fractions. Results indicate that, in the summer season, the concentrations of total dissolved As varying from 3.9 to 55.8μg/L in sediments were higher than those (5.3-15.7μg/L) measured in the winter season, while the concentrations of total As species in the solid phase varied between 10.97 and 25.32mg/kg and between 7.84 and 30.52mg/kg on a dry weight basis in summer and winter, respectively. Seasonal profiles of dissolved As suggest downward and upward diffusion, and the flux of dissolved As across the sediment-water interface (SWI) in summer and winter were estimated at 3.88mg/m2a and 0.79mg/m2a, respectively. Based on porewater profiles and sediment phase data, the main geochemical behavior of As was controlled by adsorption/desorption, precipitation and molecular diffusion. The solubility and migration of inorganic As are controlled by Fe-Mn oxyhydroxides in summer whereas they appear to be more likely controlled by both amorphous Fe-Mn oxyhydroxides and sulfides in winter. A better knowledge of the cycle of As in Poyang Lake is essential to a better management of its hydrology and for the environmental protection of biota in the lake. © 2014 Elsevier Ltd.

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