Untreated disposal of wastewater from coalfired power plants has environmental and public health concerns in the developing Shanbei Energy Base, Northwest China. An in situ experiment was conducted in the easily accessible wind-blown sands to study their efficiency in removal of pollutants. Approximately 245 l of wastewater was used in the test, which lasted 409 min. Sand samples were collected at 5 discrete depths, 0.2, 0.4, 0.6, 1, and 1.5 m from the surface before, at the end of, and 20 days after the infiltration test. Pollutants commonly found in wastewater were analyzed for all the sand samples. 20 days after infiltration, the content of As in the sand samples had a general reduction, decreased from original 0.0109-0.0132 to 0.005 mg/kg. The content of N-NH 4 also decreased from original 1.1-1.5 to 0.8-1.0 mg/kg. But the content of Cd and petroleum was stable and had no decreasing trend. The test indicates the wind-blown sands are more effective for As and N-NH 4 , but less effective for petroleum and Cd.
Based on analysis of the two main deficiencies of the current evaluation methods of carbonic acid erosion of groundwater to the concrete in China: a). the carbonic acid erosion indexes [CO 2 ] s of different water samples have no comparability with each other; b). It is difficult to draw carbonic acid erosion partitioning map, a universal 'discriminant of groundwater' was deduced in this article. By employing special compiled 'calculation procedure of discriminant of carbonic acid erosion', not only calculation of the newly defined 'discriminant of carbonic acid erosion' has been completed, but also the calculation of carbonic acid erosion indexes [CO 2 ] s by artificial table checking and interpolation in the past has been realized in computer. With the help of the discriminant and the calculation procedure proposed in this paper, not only horizontal comparison of the carbonic acid erosion between water samples is feasible, but also the partitioning map of the carbonic acid erosion can be compiled quantitatively. Furthermore, the two main deficiencies of the current evaluation method and the feasibility of drawing carbonic acid erosion partitioning map quantitatively by the discriminant in this paper the are shown in cases.Keywords-Carbonic acid erosion to concrete; Index of carbonic acid erosion; Discriminant of carbonic acid erosion; The carbonic acid erosion partitioning map
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