Untreated disposal of coal mine wastewaters from Shanbei loess have environmental and public health concerns in the developing Shanbei Loess Plateau, Northwest China. An in-situ experiment was conducted in the easily accessible loess to study their efficiency in removal of pollutants. Approximately 565L of wastewater was used in the test, which lasted 333min. Loess samples were collected at 5 discrete depths, 0.2m, 0.4m, 0.6m, 1m, and 1.5m from the surface before, at the end of, and 20 days after the infiltration test. Pollutants commonly found in wastewaters were analyzed for all the loess samples. The test indicates the loess is more effective for Cd and Pb.
Land subsidence is one of the most prominent geological disasters in Xi’an, China. A review of the occurrence and development of land subsidence in Xi’an in past 50 years is given in this article. The characteristics of land subsidence in Xi'an were analyzed from time-space distribution, the development of subsidence center and its relationship with the withdrawal of groundwater. The development and characteristics of land subsidence indicate that the withdrawal of groundwater especially the confined groundwater is the major cause of land subsidence in Xi’an. Shutting down the private wells and reducing groundwater exploitation have very apparent effect on decelerating subsidence development. Limiting the exploitation and making reasonable exploitation program of groundwater are effective measures to prevent the land subsidence.
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