China National Environmental Monitoring Station

Beijing, China

China National Environmental Monitoring Station

Beijing, China

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Bai L.-P.,Chinese Research Academy of Environmental Sciences | Wang Y.-Y.,China National Environmental Monitoring Station | Guo Y.-L.,Beijing Normal University | Zhou Y.-Y.,Chinese Research Academy of Environmental Sciences | And 3 more authors.
Huanjing Kexue/Environmental Science | Year: 2014

Groundwater is the main source of water supply in China, and China's overall situation of groundwater pollution is not optimistic at present. Groundwater pollution risk evaluation and early-warning are the effective measures to prevent groundwater pollution. At present, research of groundwater early-warning method at home and abroad is still at the exploratory stage, and the sophisticated technology has not been developed for reference. This paper briefly described the data and technological demand of the early-warning method in different scales, and the main factors influencing the early-warning results of groundwater pollution were classified as protection performance of geological medium, characteristics of pollution sources, groundwater dynamics and groundwater value. Then the main early-warning indexes of groundwater pollution were screened to establish the early-warning model of regional or watershed scale by the index overlay method. At last, the established early-warning model was used in Baotou plain, and the different early-warning grades were zoned by the model. The research results could provide scientific support for the local management department to protect the groundwater resources.


Bai L.,Chinese Research Academy of Environmental Sciences | Wang Y.,China National Environmental Monitoring Station | Zhou Y.,Chinese Research Academy of Environmental Sciences | Liu L.,Chinese Research Academy of Environmental Sciences | And 2 more authors.
Water Science and Technology: Water Supply | Year: 2016

A universal method to evaluate groundwater pollution risk with the site scale has not beenestablished. The groundwater pollution risk is commonly evaluated by overlaying the results of groundwater vulnerability and pollution sources, but this method is inapplicable for contaminated sites. Considering the current supervision demands of groundwater pollution in China, this paper suggests a risk evaluation method for contaminated sites. The present and forecasted groundwater pollutant concentrations and the variation trend of groundwater quality were used to get the risk classes of groundwater pollution. Chromium is one of the most common groundwater contaminants found at industrially contaminated sites. A chromium residue disposal site in Baotou, China was selected as the study area. The groundwater flow model and solute transport model were constructed by MODFLOW and MT3DMS. Based on the simulation results of the numerical model, the groundwater pollution risk of the contaminated site was divided into four classes, and the regulation measures of groundwater pollution were suggested. This study could provide guidance for the environmental supervision and management of contaminated sites. © IWA Publishing 2016.


Bai L.,Chinese Research Academy of Environmental Sciences | Bai L.,Engineering Research Center for Groundwater Pollution Control and Remediation | Wang Y.,China National Environmental Monitoring Station | Li F.,Chinese Research Academy of Environmental Sciences | Li F.,Engineering Research Center for Groundwater Pollution Control and Remediation
Advanced Materials Research | Year: 2012

The risk assessment model and parameter system of groundwater pollution were established in this paper. The multi-index evaluation method of groundwater pollution sources was proposed, and the GIS-based risk assessment method of groundwater pollution was produced in comprehensive consideration of groundwater vulnerability and groundwater pollution sources. The multi-index method suggested in this paper was used in the risk assessment of groundwater pollution at a plain area of a big city in North China, and the different grades of groundwater pollution risk were computed. The evaluation results show that the groundwater pollution risk is determined by the combined action of pollution sources and groundwater vulnerability. The established risk assessment method of groundwater pollution could give a scientific support for the regional groundwater pollution prevention and control planning. © (2012) Trans Tech Publications, Switzerland.


Ji D.,Water Resources University | Yang Q.,Water Resources University | Wang Y.,China National Environmental Monitoring Station | Meng F.,Chinese Research Academy of Environmental Sciences
Fresenius Environmental Bulletin | Year: 2015

This study investigated the dechlorination of 1, 1-DCE with nPd/Fe particles under different temperatures. The dechlorination rates with nPd/Fe were significantly faster than those with nZVI particles. According to the XPS spectra, the palladium was present on the iron surface in the elemental state and there were more Fe0 oxidized to Fe3+ on the surface of aged nPd/Fe particles than fresh nPd/Fe particles. Activation energies of the dechlorination reactions with the nPd/Fe and nZVI particles are estimated to be 38.90 kJ/mol and 55.18 kJ/mol, respectively. Based on rigorous analysis of the thermodynamics parameters, the dechlorination of 1, 1-DCE was a non-spontaneous and endothermic process. Moreover, analysis of the reaction products demonstrated that 1, 1-DCE was completely dechlorinated to the ethane and ethylene without toxic intermediate. In addition, Both XPS analysis and the temperature-dependent study indicated that the hydrodechlorination reaction occurring in the presence of nPd/Fe particles is a catalytic reaction. Palladium on the zero-valent iron surface serving as a catalyst, could provide more surface active sites so as to facilitate and speed up the reaction.


Bai L.,Chinese Research Academy of Environmental Sciences | Bai L.,Engineering Research Center for Groundwater Pollution Control and Remediation | Wang Y.,China National Environmental Monitoring Station | Meng F.,Chinese Research Academy of Environmental Sciences
Water and Environment Journal | Year: 2012

Groundwater vulnerability assessment plays a vital role in the utilization and protection of groundwater resources. DRASTIC is one of the most widely used models for groundwater vulnerability assessment. However, the DRASTIC model should be modified based on the local hydrogeological conditions in order to get a relatively accurate result. In this study, Baotou, China was chosen as a case study. The groundwater vulnerability was assessed using DRASTIC at first, but the evaluation results were not consistent with the groundwater quality. So the DRASTIC model was modified based on extension theory and analytic hierarchy process (AHP) method. The extension theory could be used to divide the groundwater vulnerability grades in the DRASTIC model. It is a new attempt to use extension theory and DRASTIC in the assessment of groundwater vulnerability, and the research results show that this method is better for assessing groundwater vulnerability. © 2011 The Authors. Water and Environment Journal © 2011 CIWEM.


Meng F.,Chinese Research Academy of Environmental Sciences | Wang Y.,China National Environmental Monitoring Station | Leng L.,Chinese Research Academy of Environmental Sciences | Wang J.,Chinese Research Academy of Environmental Sciences
Advanced Materials Research | Year: 2012

Electrokinetic remediation, variably named as electrochemical soil processing, electromigration, ectrokinetic decontamination or electroreclamation, uses electric currents to extract radionuclides, heavy metals, certain organic compounds, or mixed inorganic species and some organic wastes from soils and slurries. This paper presents the experimental study on the effect of applied voltage on the electrokinetic removal of the chromium from kaolin at laboratory scale. Potassium dichromate was chosen as the pollutant and its initial concentration was 100 mg·kg -1 and 500mg·kg -1, the moisture content of samples is 50%. The experiments were operated 48 hours and the pH of cathode was control at 4-7 with of acetic acid. And a series of voltages were applied. The results indicate the removal efficiencies increase with the increase of applies voltage, when the voltage is 1V/cm, the efficiencies increase significantly, the efficiency reach up to 76.7% and 89.8% of two studied samples. The electric energy consumptions also increase significantly due to the increase of applied voltage. The experiment data show 1-1.5V/cm is cost effective voltage range for the soils studied.


Bai L.,Chinese Research Academy of Environmental Sciences | Wang Y.,China National Environmental Monitoring Station | Zhang Y.,Chinese Research Academy of Environmental Sciences | Zhou Y.,Chinese Research Academy of Environmental Sciences | And 2 more authors.
Soil and Sediment Contamination | Year: 2016

Cr(VI) is a characteristic soil and groundwater contaminant in the chromite ore processing residue (COPR) disposal regions. Investigation of Cr(VI) adsorption and migration characteristics in topsoils has great significance for the supervision of contaminated sites. The methods of adsorption and soil column leaching experiments were used to study Cr(VI) migration characteristics in this research, and a Cr(VI) contaminated site in Hanqingba region of Baotou was chosen as the study area. Based on the adsorption experiment results, the soil adsorption properties of Cr(VI) were interpreted by the Langmuir and Freundlich adsorption isotherm, and the saturation adsorption capacity of the soil sample for Cr(VI) was 70.4 mg/kg. Cr(VI) migration characteristic in the soils was studied through the tracer and migration experiments. The permeability coefficient of the soil sample was 0.059 m/d, and the dispersion coefficient was 0.0371 cm2/s. The breakthrough curves of Br and Cr(VI) showed that the retardation effect of Cr(VI) in the soil was not obvious, and the computed retardation factor was 2.39. Under the circumstances of precipitation or irrigation, Cr(VI) in the COPR could be leached out, and the groundwater may be polluted for the weak soil adsorption capacity of Cr(VI). The research results could provide scientific support for the soil and groundwater pollution prevention and control plan of local government. © 2016 Taylor & Francis Group, LLC


Bai L.,Chinese Research Academy of Environmental Sciences | Bai L.,Engineering Research Center for Groundwater Pollution Control and Remediation | Wang Y.,China National Environmental Monitoring Station | Fang H.,China University of Geosciences | And 5 more authors.
Water Science and Technology: Water Supply | Year: 2013

Current research on groundwater vulnerability is aimed mainly at groundwater pollution vulnerability (GPV), and the vulnerability of groundwater quantity is seldom considered. It is important to carry out the groundwater vulnerability evaluation for the management of groundwater resources. This paper presents evaluation models and methods for assessing groundwater quantity and pollution vulnerability. The models and methods were used to evaluate the groundwater vulnerability in the plain area of Baotou, Inner Mongolia, China. The groundwater quantity vulnerability was assessed by computing the groundwater recharge rate, and the GPV was evaluated by simulating the migration time for pollutants traveling from ground surface to the aquifer. The research results could provide scientific support for the management of regional groundwater resources, prevention and control of groundwater pollution. © IWA Publishing 2013.


Ji D.,Water Resources University | Yang Q.,Water Resources University | Wang Y.,China National Environmental Monitoring Station | Xi H.,Chinese Research Academy of Environmental Sciences
Fresenius Environmental Bulletin | Year: 2015

A bacteria strain P-l which was capable of utilizing phenanthrene as the sole carbon and energy source, was isolated from municipal activated sludge using an enrichment method. On the basis of the morphology, biochemical properties and the 16S rDNA sequence analysis, the strain was identified as Sphingobacterium multivorum. Volatilization, adsorption and degradation behaviors of phenanthrene (at initial concentration of 0.854 mg/1) caused by the strain P-l were investigated respectively at temperature of 28 °C and pH 7.2, almost complete degradation of phenanthrene was observed within 25 h. Moreover, the adsorption process well followed the pseudo first-order kinetics and the adsorption rate constant ka = 4.596 h-1; both volatilization and degradation processes were in line with the pseudo first-order kinetics equation, the volatilization rate constant kv = 0.0581 h-1, the degradation rate constant kd = 0.1050 h-'. Accordingly, biodegradation model for the time evolution of phenanthrene concentration was established and verified. Furthermore, isolation of the bacteria strain P-l in the study confirmed that bacteria Sphingobacterium multivorum played an important role in degradation of PAHs in the municipal sewage. © by PSP Volume 24 - No 1. 2015.


Fansheng M.,Chinese Research Academy of Environmental Sciences | Lingli L.,Chinese Research Academy of Environmental Sciences | Juling W.,Chinese Research Academy of Environmental Sciences | Yeyao W.,China National Environmental Monitoring Station
Proceedings of the 2013 3rd International Conference on Intelligent System Design and Engineering Applications, ISDEA 2013 | Year: 2013

Electrokinetic remediation, variably named as electrochemical soil processing, electromigration, ectrokinetic decontamination or electroreclamation, uses electric currents to extract radionuclides, heavy metals, certain organic compounds, or mixed inorganic species and some organic wastes from soils and slurries. This paper presents the experimental study on the effect of control at the cathode for the electrokinetic remediation efficiency of the chromium-polluted soils at laboratory scale. Potassium dichromate was chosen as the pollutant and its initial concentration was 100mg•kg-1 soil and 500mg•kg-1 soil. 1 DCV/cm voltage was applied, and the experiments were operated for 48h. The results indicate that pH control at the cathode can improve the removal efficiency of hexavalent chromium from kaolin significantly, and the electric energy consumption changed slightly. Neutralizing the OH- result from the electroanalysis of cathode with hydrochloric acid is the most effective method out of the several methods investigated, and the removal efficiency of hexavalent chromium reaches up to 90.8%, but it is necessary to do more research to prevent the acidification of soils. Also, the movement and transformation of hexavalent chromium in soils should be studied thoroughly. © 2012 IEEE.

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