Columnar infiltration device and method for simulating in-situ migration and transfer of pollutants
A technology for migration and transformation of pollutants, applied in the fields of environmental engineering and environmental ecology, can solve the problems of difficult comparison of test results, influence of pollutant migration, and high solid-liquid ratio, shortening the test period, reducing the concentration of pollutants, reducing the operation easy effect
Inactive Publication Date: 2012-07-18
BEIJING NORMAL UNIVERSITY
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Problems solved by technology
However, there are some problems with this method: First, in the adsorption simulation experiment, the solid-liquid ratio is relatively high and varies greatly
The ability of soil and sediment to retain pollutants changes with the change of solid-liquid ratio. The simulation conditions are quite different from the field environment, making it difficult to compare the test results with the real situation.
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[0017] The invention is applied to study the adsorption effect of sediments on heavy metals in surface runoff. Slowly add 10mL of surface runoff to the PVC pipe, the weight of the sediment is 1g, the ratio of leachate to adsorbent (V / m) is 10:1. 16 percolation tubes are a group, put them in the centrifuge, start Centrifuge, the working conditions of the centrifuge are such that the centrifuge tube receives an average force of 1600×g and runs continuously for 20 minutes. After centrifugation, the percolation tube was taken out, and the concentration of heavy metals Cr, Cu, Cd, and Zn in the sediment leachate was measured and compared with the concentration in the surface runoff of the leachate to obtain the amount of heavy metal adsorbed by the sediment (see table for results) 1). In Table 1, when the amount of heavy metal adsorbed by the sediment is positive, it means that the sediment has adsorbed the corresponding heavy metal, which has the effect of removing heavy metals; w...
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The invention belongs to the fields of environmental engineering and environmental ecology and provides a columnar infiltration device and a method for simulating a dynamic process of a natural absorbing agent which absorbs and desorbs pollutants at room temperature. The columnar infiltration device consists of three main parts, namely, a pipe cap, an outer pipe and an inner pipe, a double-layer baffle plate with holes is arranged at the bottom of the inner pipe, a filter film is arranged in an interlayer, and an infiltration layer and a leaching agent are filled in the interlayer from the bottom to top, and percolate at the bottom of the outer pipe is collected. According to the invention, the transferring condition of water in natural absorbing agents such as soil, sediments and the like under the natural condition is simulated effectively, the effective separation of the percolate and the absorbing agents can be realized, and the risk of the reduction of the pollutant concentration in balance solution due to the secondary sedimentation of the absorbing agents can be lowered.
Description
Technical field [0001] The invention belongs to the fields of environmental engineering and environmental ecology, and particularly relates to a columnar infiltration device and method that simulates the dynamic process of natural adsorbent (soil, sediment, etc.) on the adsorption and desorption of pollutants under room temperature conditions. Background technique [0002] Pollutants in soil and sediments are closely related to the risk of groundwater and food chain pollution, and their migration and transformation behavior has received widespread attention. The migration behavior of pollutants is affected by a series of physical and chemical processes, including the adsorption of colloidal surfaces, and the migration of pollutants through advection, diffusion and dispersion processes. The degree of adsorption of pollutants depends on the types of pollutants and the characteristics of clay minerals in the soil and sediments. Therefore, quantitative research on the migration and ...
Claims
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IPC IPC(8): G01N30/00
Inventor 崔保山蓝艳张志明张永涛李峰居高宇璐陈子惟
Owner BEIJING NORMAL UNIVERSITY