Chengdu Academy of Environmental science

Chengdu, China

Chengdu Academy of Environmental science

Chengdu, China
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Wang Y.Y.,Chengdu Academy of Environmental science | Wang Y.Y.,Chengdu Environment Engineering Appraisal Center | Xu Z.X.,Tongji University
IOP Conference Series: Earth and Environmental Science | Year: 2017

Surface water eutrophication has become a worldwide social issue. large amounts of secondhand energy, high capital investment are required, and most ecosystem disturbances will arise in the conventional eutrophication restoration measures. However, mobile solar-energy water aerator has the better oxygen transfer rate, hydrodynamic condition and can be used in the large waterbody for its cruising character. Second, the device is low carbon and sustainable for the solar photovoltaic system applications. So the device can be widely used in the eutrophication restoration. © Published under licence by IOP Publishing Ltd.

Wang L.,Southwest University of Science and Technology | Li C.,Chengdu Academy of Environmental science | Jin M.,Southwest Research Institute
C e Ca | Year: 2017

Featuring a huge demand of cooling and heating power, the mismatch between power demand and thermal demand, and large-scale cooling and heating sources, the regional distributed energy system plays an important role in energy transmission, distribution and consumption, and has a direct bearing on energy conservation and economic efficiency. This paper probes into the variable operation characteristics of regional distributed energy system based on combined cycle power generation units. Specifically, it establishes the theoretical models on the operation characteristics of gas-steam combined cycle power generation system and conventional cooling and heating source system, and conducts a case study to simulate the heating, cooling and power load of three reasonable configurations of cooling and heating sources. Next, the C# language-based analysis software is adopted to measure the operation performance of the distributed energy system, calculate the capacity of steam Li-Br units and power units under different conditions, and determine the system parameters like output and energy consumption. Finally, the author puts forward the optimized operation plan.

Li L.,Beijing Normal University | Tan Q.,Chengdu Academy of Environmental science | Zhang Y.,Peking University | Feng M.,Chengdu Academy of Environmental science | And 3 more authors.
Environmental Pollution | Year: 2017

Based on detailed data from Chengdu Plain (CP) from 6 January to 16 January, two typical haze episodes were analyzed to clarify the haze formation mechanism in winter. Weather conditions, chemical compositions, secondary pollutant transformation, optical properties of aerosols, the potential source contribution function (PSCF) and source apportionment were studied. The planetary boundary layer (PBL) height decreased distinctly during the haze episodes and restrained air pollutant vertical dispersion. As the haze worsened, the value of PBL × PM2.5 increased notably. The [NO3 −]/[SO4 2−] ratio was 0.61, 0.76 and 0.88 during a non-haze period, episode 1 and episode 2, respectively, indicating that the mobile source of the air pollution is increasingly predominant in Chengdu. Water vapor also played a vital role in the formation of haze by accelerating the chemical transformation of secondary pollutants, leading to the hygroscopic growth of aerosols. The PSCF and backward trajectories of the air masses indicated that the pollution mainly came from the south. The secondary inorganic aerosols, vehicle emissions, coal combustion, biomass burning, industry, and dust contributed 34.1%, 24.1%, 12.7%, 12.3%, 7.6%, and 7.2% to PM2.5 masses in episode 1 and 28.9%, 23.1%, 9.4%, 9.5%, 20.3% and 7.5% in episode 2. © 2017 Elsevier Ltd

Ouyang L.-L.,Sichuan University | Ouyang L.-L.,Chengdu Academy of Environmental science | Pan Y.-D.,Portland State University | Huang C.-M.,Sichuan University | And 3 more authors.
Journal of Mountain Science | Year: 2016

Jiuzhaigou, characterized by its magnificent waterscapes and subalpine karstic features, is both a World Heritage Site and a World Biosphere Reserve in southwestern China. In recent years, this unique ecosystem has shown signs of stress due to increasing tourism activities within the reserve. The various routine methods, which monitor physical and chemical properties, do not fully reflect water quality in the subalpine and alpine lakes, while the indicators using aquatic organisms to evaluate the water quality or status of the subalpine lakes are poorly reported. Thus, in this study, benthic diatoms from multiple habitats in Jiuzhaigou were sampled and assessed for water quality monitoring. Canonical Correspondence Analysis (CCA) showed that the canonical coefficients for elevation, water temperature and total nitrogen on the first Canonical Correspondence Analysis axis were -0.84, 0.78 and -0.53, respectively, environmental variables associated with the distribution patterns of benthic diatoms. The dominance of diatom taxa indicative of nutrient enrichment indicates a clear trend toward eutrophication in the Pearl Shoal and Colorful Lake, two of the sites mostly visited by tourists. It was observed that the effect of the type of substratum on diatom community composition is not significant in subalpine lakes. The most dominant species in Jiuzhaigou lakes are the genera Achnanthes, Fragilaria, Cymbella, Cocconeis, Diatoma and Denticula. In combination with dominant and sensitive species in the benthic diatom communities, CCA and CA methods can be used to evaluate the impact of human activities on subalpine karstic lakes. The dominance of diatom taxa is indicative of nutrient enrichment and the results of CCA and CA indicate a clear trend toward eutrophication in the Pearl Shoal and Colorful Lake, two of the sites mostly visited by tourists. © 2016, Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg.

Wang P.,Southwest University | Shang Y.-N.,Chengdu Academy of Environmental science | Shen L.-C.,Southwest University | Wu K.-Y.,Southwest University | Xiao Q.,Southwest University
Huanjing Kexue/Environmental Science | Year: 2013

Freshwater lake of the Tibetan plateau has great ecological value and extreme vulnerability. The water samples have been collected in Daggyaima Co at an altitude of 5080 m±10 m. This study has investigated the sources, the major controlling factors of the major ions, and hydrochemical evolution trend according to the hydrochemical composition of water samples. The results showed that the major cations and anion of lake water were Ca2+, Na+ and HCO3 -, respectively, and the hydrochemical type was HCO3-Ca, The total dissolved solid (TDS) was in the range of 71.2-199.8 mg·L-1. The concentrations of EC, Ca2+ and HCO3 - in water samples from Southeast areas were relatively low resulted from the rich aluminum and poor calcium of geological background and the dilution effect of surface runoff. The Na+/(Na++Ca2+) of water samples was 0.08-0.75, Cl-/(Cl-+HCO3 -) was 0.11-0.35, Ca/Na was 0.58, Mg/Ca was 0.12, and HCO3/Na was 1.46, which suggested that the hydrochemical composition of the lake water was mainly controlled by silicate rock weathering based on Gibbs model and analysis of elemental stoichiometry. The minerals participated in weathering processes included plagioclase (anorthite, albite), potassium feldspar, biotite, calcite, dolomite, gypsum, rock salt, etc. The average value of K/Na was 0.059, indicating the weathering level of potassium feldspar was relatively low. The saturation index (SI) of calcite, dolomite, gypsum, quartz and hematite contained in the lake was higher than zero, while the SI of rock salt was lower than 0, revealing the trend that the freshwater lake is turning into salt water lake in Tibetan Plateau.

Ding Y.,Chengdu Academy of Environmental science | Jiang Y.N.,Sichuan Normal University | Yang K.H.,Chengdu Academy of Environmental science | Zhu M.,Sichuan Normal University
Materials Science Forum | Year: 2016

The effect of a novel amphoteric polymeric flocculant, p(DMC/NVP/FA), was investigated in processing dyeing wastewater. The optimum for flocculant dosage was 55mg/L, and one for pH was 5. Under the optimum conditions, the intrinsic viscosity of flocculant and the removal rates of CODcr and chroma reached the top(274.425dL/g, 80.1%, 92.6%). Analysis dyeing wastewater flocs SEM by calculating the Df (a symbol stands for fractal dimension) values of fractal dimension with Non-Linear fractional theory. The results of the theorical computationare coordinated with the text. © 2016 Trans Tech Publications, Switzerland.

Jia B.-Y.,University of Sichuan | Jia B.-Y.,Chengdu Academy of Environmental science | Tang Y.,University of Sichuan | Wu Y.-H.,University of Sichuan | Yin D.-S.,University of Sichuan
Proceedings - 2012 International Conference on Biomedical Engineering and Biotechnology, iCBEB 2012 | Year: 2012

The water quality of the Sancha Lake has declined from Class III to Class IV and Class V due to increasing eutrophication, to which human activity has contributed considerably since it was built in 1977. This research examines changes in sedimentation rate and supply of mass accumulation of the Sancha Lake in recent decades through 210Pb and 137Cs dating and records of historical events in lacustrine sediments. This research also examines the process of change in the lake environment and identifies the driving effect of human activity on the evolutionary process of the lake environment by combining the analysis on the change characteristics of the sediments' grain size and C, N and P therein. The findings of the research show that human activities, especially cage culture, application of pesticides and chemical fertilizers, and development of tourism, are the main factors causing eutrophication and environmental change in the Sancha Lake. © 2012 IEEE.

PubMed | Chengdu Academy of Environmental science, Chengdu Center, University of Basel and University of Sichuan
Type: Journal Article | Journal: Environmental monitoring and assessment | Year: 2016

Phosphorus (P) fractionations in the surface sediment of Sancha Lake in Chinas southwestern Sichuan Province were examined to assess the potential P release at the water-sediment interface and to understand its seasonal (2009-2010) and historical dynamics (1989-2010) in the surface water. Elevated P concentrations were detected in the sediment at main reservoir inflow, south canal of the Dujiangyan irrigation network, and intensive cage fish farming area, accounting for 32 and 40% of current total P discharges. The highest total P concentration (11,200gPg

PubMed | Chengdu Academy of Environmental science, University of Basel and University of Sichuan
Type: | Journal: Scientific reports | Year: 2015

Fish farming has seriously influenced the aquatic environment in Sancha reservoir in SW China since 1985 and has been strongly restricted since 2005. Thus, phosphorus speciation in a sediment core dated between 1945 and 2010 at cm-resolution and in surface sediments from Sancha reservoir may allow us track how fish farming impacts phosphorus dynamics in lake sediments. Fish farming shifts the major binding forms of phosphorus in sediments from organic to residual phosphorus, which mostly originated from fish feed. Sorption to metal oxides and association with organic matters are important mechanisms for phosphorus immobilisation with low fish farming activities, whereas calcium-bound phosphorous had an essential contribution to sediment phosphorus increases under intensive fish framing. Notwithstanding the shifting, the aforementioned phosphorus fractions are usually inert in the lake environment, therefore changing phosphorus mobility little. The use of fish feed and water-purification reagents, the most important additives for fish farming, introduce not only phosphorus but also large amounts of sand-sized minerals such as quartz into the lake, to which phosphorus weakly sorbs. The sand-sized minerals as additional sorbents increase the pool of easily mobilisable phosphorus in sediments, which will slow down the recovery of reservoir water due to its rapid re-mobilisation.

Liu G.-R.,Nankai University | Shi G.-L.,Nankai University | Zhang P.,Chengdu Academy of Environmental science | Zhou L.-D.,Chengdu Academy of Environmental science | And 2 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2014

PM10-associated polycyclic aromatic hydrocarbons (PAHs) were investigated in summer and winter 2009 from Chengdu, China. A total of 16 priority PAHs were measured, with the total concentrations (ΣPAHs) (ng/m3) ranging from 40.25 to 150.68 in winter and from 44.51 to 71.16 in summer, respectively. The average concentration of ΣPAHs were 88.36 in winter and 64.21 in summer. Meanwhile, the spatial distribution of PAHs was discussed. The results showed that the ΣPAHs in industry region exhibited the highest concentration while those in the background region showed the lowest level. In order to explore composition of PAHs, characteristics of low ring and high ring PAHs were explored. The high ring PAHs presented high fractions (86.7%~96.1%), indicating that the PAHs might be formed in high temperature combustion processes. In addition, in order to investigate potential source categories of PAHs in PM10, three statistical methods (ratio method, hierarchical cluster analysis, principal component analysis) were employed. Agreement results were obtained from above-mentioned different methods, suggesting that the main source categories of PAHs were vehicle emission and coal and wood combustion. Finally, the risk assessment of PAHs was determined by Benzo(a)pyrene equivalent (BaPE), which suggested that the toxicity of PAHs was at high level during winter and summer time. ©, 2014, Editorial Board of China Environmental Science. All right reserved.

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