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PubMed | Water Resources University, China Institute for Geo environmental Monitoring and China Institute of Metrology
Type: | Journal: Chemosphere | Year: 2016

High arsenic (As) groundwater usually has high concentrations of natural organic matter (NOM). Effects of NOM on arsenic adsorption were investigated to evaluate the efficiency of modified granular natural siderite (MGNS) as an adsorbent for groundwater arsenic remediation. Humic and fulvic acids (HA/FA) were selected as model NOM compounds. In batch tests, HA or FA was either first adsorbed onto the MGNS, or applied together with dissolved arsenic to investigate effects of both adsorbed and dissolved NOM on arsenic removal. The kinetic data showed no significant effects of both adsorbed and dissolved HA/FA on As(III) adsorption. However, As(V) removal was inhibited, whereby the adsorbed NOM compounds had greater inhibitory effect. The inhibitory effect on As(V) removal increased with increasing NOM concentrations. FA exhibited higher inhibitory effect than HA at the same concentration. Steric Exclusion Chromatography-HPLC (SEC-HPLC), and High-Performance Size Exclusion Chromatography-UV-Inductively Coupled Plasma Mass Spectrometry (HPSEC-UV-ICP-MS) revealed that As(V) removal was mostly achieved by the oxyanion adsorption and adversely affected by dissolved FA via competitive adsorption for surface sites. In addition to oxyanion adsorption, removal of As(V) was related to scavenging of ternary HA-As-Fe complexes, which led to the less inhibitory effect of dissolved HA on As(V) removal than dissolved FA via competitive adsorption.

Gao C.-R.,China Institute for Geo Environmental Monitoring | Liu W.-B.,China University of Geosciences | Feng C.-E.,China Institute for Geo Environmental Monitoring | Liu B.,China Institute for Geo Environmental Monitoring | Song J.-X.,China Institute for Geo Environmental Monitoring
Acta Geoscientica Sinica | Year: 2014

Distribution characteristics of saline groundwater and high-arsenic groundwater in the Hetao Plain of Inner Mongolia was discussed in detail based on such means as field investigation, data analysis and experiment test. The results show that large amounts of saline groundwater and high-arsenic groundwater are distributed in the Hetao Plain. In shallow groundwater at the depth of 10~40 m in the study area covering 12510.83 km2, the fresh groundwater, lower-saline groundwater and saline groundwater possess 9025.51 km2, 1145.75 km2 and 2339.57 km2 respectively, accounting respectively for 9.16%, 72.14% and 18.70% of the total study area, whereas high-arsenic groundwater (As≥0.05 mg/L) makes up 233.85 km2, 2965.74 km2 and 997.16 km2 in these three sorts of groundwater, accounting respectively for 20.41%, 32.86% and 42.62%. Saline groundwater extends as two zones respectively in the south and the north, and saline groundwater in the north is from the west to the east with the width of 5~10 km. The groundwater quality in the east is characterized by freshness in the upper part and salinization in the lower part. Saline groundwater in the south is in zoning distribution from the west to the east in the north of the water diversion main canal, which is relatively narrow in the west and wide in the east. The distribution of high-arsenic groundwater has obvious zoning characteristics. High-arsenic groundwater is distributed widely in irregular sheet form with insignificant difference of arsenic content in the east, and is distributed in NE-trending banding along low-lying terrain of mountain front region with high arsenic content in the west. The result shows that there is no positive correlation between salt concentration and arsenic concentration in groundwater. However, there does exist certain relation between the distribution of high-arsenic groundwater and the saline area in the northwest area, which is considered to be controlled by structure. And there does not exist such a relation in the east area.

Liu Q.,China University of Geosciences | Liu Q.,Water Resources University | Liu Q.,China Institute for Geo Environmental Monitoring | Guo H.,China University of Geosciences | And 4 more authors.
International Biodeterioration and Biodegradation | Year: 2013

This study investigated the potential of the Fe(II)-oxidizing bacteria in removing arsenic in aqueous environment. The bacteria were isolated from the batch of tap water and rusty iron wires, and were acclimated to culture media amended with arsenic concentrations, gradually increasing from 100 μg L-1 to 100 mg L-1. Acclimated bacteria with enhanced arsenic tolerance were used to remove arsenic from the aqueous solution. These bacteria belonged to Pseudomonas species according to 16S rRNA gene sequences. Extracellular enzymes produced by these bacteria played important roles in microbial Fe(II) oxidization and Fe oxide precipitation. Moreover, these bacteria survived and propagated in high arsenic condition (100 mg L-1 As). However, after As(III/V) acclimation, morphological characteristics of the bacteria showed some changes, e.g., shrinking of long bacillus. XRD (X-ray diffraction) patterns indicated that Fe oxide precipitations by Fe(II)-oxidizing bacteria in Fe-rich culture medium were poorly-crystallized ferrihydrites. Adsorption on the biogenic ferrihydrites greatly contributed to high arsenic removal efficiency of Fe(II)-oxidizing bacteria. © 2012 Elsevier Ltd.

Li Z.-D.,Hubei University | Luo Y.,China Institute for Geo Environmental Monitoring
Geological Bulletin of China | Year: 2011

With the concept of sustainable development as a guide, based on ecological concepts, this paper, from China's national conditions, analyzes the importance and necessity of integrated natural resources evaluation. Put forward the concept framework of integrated natural resources assessment from the perspective of ecological civilization, and discuss the construction of integrated natural resource evaluation system on the assessment of natural resources system adaptability, natural resource evaluation and natural resource accounting system, environmental impact assessment and associated evaluation of natural eresources development and utilization, and other aspects.

Li X.,Chinese Academy of Geological Sciences | Li X.,Water Resources University | Cao F.,China Institute for Geo Environmental Monitoring | Yue G.,Chinese Academy of Geological Sciences | And 3 more authors.
Earth Science Frontiers | Year: 2016

The Carboniferous shale in Eastern Qaidam is a high-quality source rock with great hydrocarbon potential. Adsorption is the most important form of shale gas storage. But the shale adsorption of this region had never been well-studied and had seriously hindered the development of shale gas production. According to the law of conservation of matter and the principle of thermodynamic equilibrium, by using the gas-particle two phase adsorption analytical instrument designed by ourselves, and based on the industrial standard of high-pressure isothermal determination of adsorption of coal, we carry out methane isothermal adsorption experiments for the shale sample from Shiqian 1 Well in eastern Qaidam Basin under 30℃, 40℃, 50℃ and 60℃. The Langmuir-Freundlich model is used for adsorption nonlinear regression analysis. The isosteric heat equation for mathane adsorption to coal is calculated through Clausius-Clapeyron equation. The experimental results show that: at a certain pressure, methane adsorption capacity of shale decreases with increasing temperature; and at a certain temperature, pressure increases, the amount of methane adsorption increases firstly and then decreases. And it is characteristic of a typical supercritical adsorption. L-F model fits well to isothermal adsorption process. Through the experimental results the 4 parameters in the model are determined and the physical meaning of each parameter is clear. The relation between the calculated isosteric heat and adsorption capacity is q=-3679.7n+9779.5. The isosteric heat deceases with the increasing of adsorption capacity. Isosteric heat combined with L-F model can predict the adsorption of shale gas at any temperature and pressure. The predicted results are in good agreement with experimental data. It has practical significance for the evaluation and exploitation of shale gas. © 2016, Editorial Office of Earth Science Frontiers. All right reserved.

Gao C.-R.,China Institute for Geo environmental Monitoring | Feng C.-E.,China Institute for Geo environmental Monitoring | Liu W.-B.,China Institute for Geo environmental Monitoring | Akai J.,Niigata University | And 2 more authors.
Acta Geoscientica Sinica | Year: 2014

In order to better monitor and predict groundwater arsenic contamination and reveal the law and mechanism of groundwater arsenic contamination caused by natural factors, the authors carried out investigation and research on groundwater arsenic contamination in Hetao Plain of Inner Mongolia for years. Based on fully understanding and grasping of arsenic chemical and geochemical properties as well as the situation and distribution characteristics of groundwater arsenic contamination all over the world, the authors summarized the distribution of arsenic in natural environment and the mechanism of groundwater arsenic contamination. This study expounded the formation mechanism of four types of groundwater arsenic contamination and presented the patterns of arsenic cycle and groundwater arsenic contamination on the earth's surface. With the basic mastering of the geological environment background of a certain region, these patterns could offer a preliminary prediction of the possible locations of arsenic contamination. This study indicates that arsenic contamination in groundwater is an environmental hydrogeochemical phenomenon, which happens in the arsenic cycle on the earth's surface. The distribution of contaminated areas is related to specific geological and geographical backgrounds and environmental conditions. This study suggests that, in the reductive desorption contamination type, such factors as the closed environment, sulfur and organic carbon constitute the main control factors for the dissolution of arsenic in strata. In the future, it is necessary to reinforce the investigation and monitoring of arsenic contamination in groundwater in closed alluvium-acustrine plains, river-lake deltas, and river-sea deltas. ©, 2014, Science Press. All right reserved.

Liu W.,China Institute for Geo environmental Monitoring | Liu W.,Water Resources University | Feng C.,China Institute for Geo environmental Monitoring | Gao C.,China Institute for Geo environmental Monitoring
Earth Science Frontiers | Year: 2014

In this paper, relatively detailed groundwater environment subregions are divided in Hetao Plain on the basis of the analysis results of regional groundwater flow field, recharge and discharge conditions. Background values of different subregions are calculated and compared by using mathematical statistic method, and the regional distribution pattern of groundwater background values for dominant components are obtained on the basis of more than 700 groundwater samples collected from Hetao Plain during the groundwater quality investigation. The results show that the differences of background values among major components, such as TDS, total hardness, total alkalinity and some standard-exceeding components, such as arsenic and TFe, are in close relationship with groundwater recharge, runoff, discharge and depositional environment conditions.

Bai M.,Beijing Jiaotong University | Yan Y.,China Institute for Geo Environmental Monitoring | Lei H.,China Institute for Geo Environmental Monitoring | Wang D.,Beijing Jiaotong University | Cheng G.,Beijing Jiaotong University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2011

Based on a loess high slope along west-east gas pipeline, the on-site monitoring experiment about the slope stability have been done. The stress change of the slope has been tested in this monitoring experiment. depended on the monitoring date and applied the method of catastrophe theory, a sharp point catastrophe model of monitoring and early-warning of loess slope stability was established. It also been applied to analyze monitoring date for a specific landslide stability advance warning. By compared with the realistic slope monitoring state, the conclusion that the early-warning model is effective can be got. At the same time it is obvious that the change characteristics of slope stability replied by the sharp point catastrophe model and the result replied by the monitoring date have consistency.

Zhou Y.,UNESCO-IHE Institute for Water Education | Li W.,China Institute for Geo environmental Monitoring
Geoscience Frontiers | Year: 2011

Significant advances in regional groundwater flow modeling have been driven by the demand to predict regional impacts of human inferences on groundwater systems and associated environment. The wide availability of powerful computers, user friendly modeling systems and GIS stimulates an exponential growth of regional groundwater modeling. Large scale transient groundwater models have been built to analyze regional flow systems, to simulate water budget components changes, and to optimize groundwater development scenarios. This paper reviews the historical development of regional groundwater modeling. Examples of Death Valley and Great Artesian Basin transient groundwater models are introduced to show the application of large scale regional groundwater flow models. Specific methodologies for regional groundwater flow modeling are descried and special issues in regional groundwater flow modeling are discussed. © 2011, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

Zhou Y.,UNESCO-IHE Institute for Water Education | Dong D.,Beijing Institute of Geo environmental Monitoring | Liu J.,Beijing Institute of Geo environmental Monitoring | Li W.,China Institute for Geo environmental Monitoring
Geoscience Frontiers | Year: 2013

Monitoring of regional groundwater levels provides important information for quantifying groundwater depletion and assessing impacts on the environment. Historically, groundwater level monitoring wells in Beijing Plain, China, were installed for assessing groundwater resources and for monitoring the cone of depression. Monitoring wells are clustered around well fields and urban areas. There is urgent need to upgrade the existing monitoring wells to a regional groundwater level monitoring network to acquire information for integrated water resources management. A new method was proposed for designing a regional groundwater level monitoring network. The method is based on groundwater regime zone mapping. Groundwater regime zone map delineates distinct areas of possible different groundwater level variations and is useful for locating groundwater monitoring wells. This method was applied to Beijing Plain to upgrade a regional groundwater level monitoring network. © 2012, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

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