Key Laboratory of Environmental Protection and Pollution and Remediation of Water and Soil of Shaanxi Province

Fengcheng, China

Key Laboratory of Environmental Protection and Pollution and Remediation of Water and Soil of Shaanxi Province

Fengcheng, China
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Zhang Y.,Key Laboratory of Environmental Protection and Pollution and Remediation of Water and Soil of Shaanxi Province | Zhang Y.,Shaanxi Provincial Academy of Environmental Science | Yang S.,Key Laboratory of Environmental Protection and Pollution and Remediation of Water and Soil of Shaanxi Province | Yang S.,Chang'an University | And 6 more authors.
Asian Journal of Chemistry | Year: 2015

Colloid is one of the important factors to affect the migration and transformation of organic pollutants in soil. Take SiO2 sol and Fe(OH)3 as the study objects, the adsorption characteristics of BHC with SiO2 sol and Fe(OH)3 colloid in the groundwater were studied. The results showed that with the existence of colloid, the order of distribution coefficients for benzene hexachlorides (BHCs) in true solution phase, colloid phase and suspended solids phase in the system from low to high was as follows: BHCsSiO2 colloid phase > BHCssuspended solids phase > BHCstrue solution phase, BHCsFe(OH)3 colloid phase > BHCstrue solution phase > BHCssuspended solids phase; the adsorption models of benzene hexachlorides with SiO2 sol and Fe(OH)3 colloid were consistent with Henry's isothermal adsorption mode and showing good linear correlation. The adsorption mechanisms of benzene hexachlorides with SiO2 sol and Fe(OH)3 colloid were studied by determining the ultraviolet spectrum and the changes in the granularity of the colloid. The result showed that the adsorption of benzene hexachlorides by the colloid was mainly physical adsorption and the stability of silicon dioxide sol was greater than that of ferric hydroxide after it adsorbed benzene hexachlorides. © 2015, Chemical Publishing Co. All rights reserved.


Sun Y.-Q.,Chang'an University | Sun Y.-Q.,Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education | Sun Y.-Q.,Key Laboratory of Environmental Protection and Pollution and Remediation of Water and Soil of Shaanxi Province | Shen Y.-Y.,Chang'an University | And 6 more authors.
Asian Journal of Chemistry | Year: 2014

The effect of weathering on the release of heavy metals from coal gangue was revealed. The XRD, SEM and Tessier five-step extraction method were applied to analyze mineral composition, mineral structure and chemical specification of heavy metals from coal gangue. The results showed that after 7-year weathering, the release rate of heavy metals with high mobility, such as Co, Cu and Pb, was 21.69, 36.49 and 36.73 %, respectively. The release rate of Cr and Zn was only 1.46 and 1.32 %, respectively. Both Mn and Fe were enriched and increased by 42.85 and 15.51 % with an increase of S content. Also, the formation of large amounts of iron colloids due to the weathering could facilitate the adsorption and complexation heavy metals. As a result, residual percentage content of heavy metals Cd, Co, Cu, Ni, Pb and Zn increased by 0.52, 12.85, 0.90, 4.53, 3.47 and 0.01 %, respectively. © 2014, Chemical Publishing Co. All rights reserved.


Han R.,Chang'an University | Han R.,Shaanxi Key Laboratory of Exploration and Comprehensive Utilization of Mineral Resources | Liu J.,Key Laboratory of Environmental Protection and Pollution and Remediation of Water and Soil of Shaanxi Province | Zhao C.,Xinjiang Academy of Environmental Protection Science | And 2 more authors.
Waste Management and Research | Year: 2016

After biophysical drying, a novel biophysical dried sludge particle was obtained. This work aims to investigate the function and effects of particle sizes and moisture contents on the fast pyrolysis of biophysical dried sludge particles. The results showed that large particles (>4 mm) favoured the oil generation with a maximum value of 19.0%, and small particles (<0.27 mm) favoured the char yield with a maximum value of 60.6%. Medium particle fractions (between 0.27 mm and 4 mm) benefited syngas production and induced higher H2 and CO emission, owing to the well-developed microstructure, enrichment of cellulose, and enhanced catalytic effects during the charring process. The introduction of proper moisture content (53.9% to 62.6%) to biophysical dried sludge was found to dramatically enhance syngas yield, hydrogen production, and carbon conversion efficiency. H2 molar concentration reached a maximum of 46.02% at a moisture content of 53.9%, which was attributed to the steam reforming and steam gasification accompanying the initial biophysical dried sludge pyrolysis. © The Author(s) 2016.


PubMed | Key Laboratory of Environmental Protection and Pollution and Remediation of Water and Soil of Shaanxi Province, Xinjiang Academy of Environmental Protection Science and Chang'an University
Type: Journal Article | Journal: Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA | Year: 2016

After biophysical drying, a novel biophysical dried sludge particle was obtained. This work aims to investigate the function and effects of particle sizes and moisture contents on the fast pyrolysis of biophysical dried sludge particles. The results showed that large particles (>4mm) favoured the oil generation with a maximum value of 19.0%, and small particles (<0.27mm) favoured the char yield with a maximum value of 60.6%. Medium particle fractions (between 0.27mm and 4mm) benefited syngas production and induced higher H2 and CO emission, owing to the well-developed microstructure, enrichment of cellulose, and enhanced catalytic effects during the charring process. The introduction of proper moisture content (53.9% to 62.6%) to biophysical dried sludge was found to dramatically enhance syngas yield, hydrogen production, and carbon conversion efficiency. H2 molar concentration reached a maximum of 46.02% at a moisture content of 53.9%, which was attributed to the steam reforming and steam gasification accompanying the initial biophysical dried sludge pyrolysis.


Cheng Y.,Chang'an University | Huo A.,Chang'an University | Huo A.,Key Laboratory of Environmental Protection and Pollution and Remediation of Water and Soil of Shaanxi Province | Zhang J.,Chang'an University | Lu Y.,Chang'an University
Environmental Earth Sciences | Year: 2014

Geohazards have become an increasingly serious problem in the Loess Plateau of China, affecting both the national economy and the livelihood of the local population. Using detailed field surveys of geohazards over many years, in conjunction with meteorological information, this paper analyzes the relationships between the characteristics of the spatial and temporal distributions of geohazards and rainfall within the study area of Huangling County in Shaanxi Province, China. A very close relationship was found between the occurrence of geohazards and rainfall distribution, indicating that rainfall is the principal driving force behind landslides, collapses, debris flows and other geohazards. Based on the analysis of the law of development of geohazards within the study area, in combination with rainfall data from the time of occurrence of local geohazards, a threshold for the early warning of meteorologically related geohazards is determined. A geohazard weather forecasting model is established based on rainfall observations and forecasts and it is applied to the study area. The results show that the model performs reasonably well and that it is beneficial to local government departments with regard to the implementation of appropriate preventive measures. © 2014 Springer-Verlag Berlin Heidelberg.

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