Time filter

Source Type

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. Source

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. Source

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. Source

Gao C.,China Institute for Geo environmental Monitoring | Liu W.,China Institute for Geo environmental Monitoring | Liu W.,Water Resources University | Feng C.,China Institute for Geo environmental Monitoring | And 3 more authors.
Earth Science Frontiers | Year: 2014

The formation mechanism of high arsenic groundwater in arid and semi-arid area is a relatively complex geochemical and environmental hydrogeochemical process. Based on methods such as the field investigation, the data analyses and the experimental tests, detailed studies are carried out to understand the distribution characteristics and geological setting of high arsenic groundwater in Hetao Plain in Inner Mongolia. The source of arsenic in groundwater and strata, the physical and chemical processes of aggregation and dissolution are studied, and three patterns of arsenic aggregation in Hetao Plain formation are put forward, namely, the migration along the fault-accumulation patterns, the colloidal effect in river and lake-accumulation pattern, and the evaporation and accumulation pattern. The research shows that the arsenic in groundwater in Hetao Plain is originated from the strata, and the main arsenic sources of the strata are of three aspects: (1) the surrounding mountains, especially in the western mountains with high mineralization belt, (2) the upper reaches of the Yellow River, and (3) the tectonically transported deep groundwater. The arsenic dissolution out from the strata is related to three factors, that is, the underground reducing environment, the de-sulphation and the infiltration of abundant irrigation water. Source

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. Source

Discover hidden collaborations