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 ecology and environmental engineering, can solve the problems of difficult comparison of test results, influence of pollutant migration, high solid-liquid ratio, shorten the test period, reduce the concentration of pollutants, reduce the operation easy effect
Inactive Publication Date: 2014-01-15
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 present invention is used to study the adsorption of sediments to heavy metals in surface runoff. Slowly add 10mL of surface runoff into the PVC pipe, the sediment weight is 1g, and the ratio of leaching agent to adsorbent (V / m) is 10:1. 16 percolation tubes form a group, put them into the centrifuge, and start Centrifuge, the working condition of the centrifuge is to make the centrifuge tube bear an average force of 1600×g, and run continuously for 20 minutes. After the centrifugation, the percolation tube was taken out, and the concentration of heavy metals Cr, Cu, Cd, Zn in the sediment leachate was measured, and compared with the concentration in the surface runoff of the leaching agent, the amount of heavy metals adsorbed by the sediment was obtained (results are shown in Table 1). In Table 1, when the amount of heavy metals adsorbed by sediments is positive, it means that the sediments have adsorbed the corresponding heavy metals, which has the effect of remo...
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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 percolation device and method for simulating the dynamic process of adsorption and desorption of pollutants by natural adsorbents (soil, sediment, etc.) at room temperature. Background technique [0002] Pollutants in soil and sediment are closely related to the risk of groundwater and food chain pollution, and their migration and transformation behavior has received extensive attention. The migration behavior of pollutants is affected by a series of physical and chemical processes, including colloidal surface adsorption, and the movement of pollutants through processes such as advection, diffusion and dispersion. The degree of adsorption of pollutants depends on the type of pollutants and the characteristics of clay minerals in soil and sediment. Therefore, quantitative research on the migration and transformation of poll...
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