Experimental Study On Coupled Transport Characteristics And Temperature Effect Of Suspended Particles And Heavy Metal Ions

ABSTRACT:The influence of suspended particles in saturated porous media on the migration characteristics of heavy metal ions is of great significance in industrial and domestic sewage treatment,nuclear waste disposal,heavy metal pollutant control,chemical industry and landfill disposal.In this paper,the influence of suspended particles in saturated porous media on the migration characteristics of heavy metal ions was studied by indoor soil column penetration test,considering the factors such as infiltration temperature,flow velocity,particle size and concentration of silica fume and lead ion concentration.The main research contents are as follows:(1)In contrast to the variation of a single silicon particle in saturated porous medium under the temperature of the normal temperature,and the difference of the single silica powder in the saturated porous medium,and the penetration of the three kinds of silica powder,concentration and seepage velocity,the results show that the silica powder penetrates the curve in both conditions similar to the normal curve,but the presence of the H + in the acidic condition will inhibit the migration of the silica powder;When the particle size of silica powder was smaller,the relative concentration of silica powder in the outflow liquid increased with the increase of concentration,but the increase of the acid condition decreased.When the particle size of silica powder is large,the critical injection concentration exists in the neutral condition,while the acidic condition does not exist.(2)To study the migration properties of a single silicon in a saturated porous medium,with four kinds of temperature,and the penetration of silicon powder,concentration,and seepage velocity,the results indicate that the penetrating curve of silicon powder in different temperatures is similar to a normal curve,just like the normal temperature.With the increase of temperature,the relative concentration peak of silicon powder in the outflow liquid is smaller,and the corresponding pore volume will be advanced.The penetration curves of the corresponding penetration curves of high temperature are basically enveloped at low temperature,indicating that as the temperature increases,the dispersion of silica powder is smaller.When the particle size is small,the high temperature of low seepage velocity has stronger effect on the migration of granule.The migration of silica particles was influenced by temperature,particle size and seepage velocity.(3)To study the migration characteristics of a single lead ion in a saturated porous medium in a saturated porous medium,four kinds of temperature,three kinds of lead ion concentration and seepage speed,the results show that the penetration of lead ions and particles in saturated porous media is different,and the lead ion has a distinct asymmetry in the trajectory of the lead ion.Under the same condition,the relative concentration peaks of lead ions and their corresponding pore volume in the three seepage velocity were weak.With the increase of lead ion concentration,the relative concentration of lead ions in the outflow fluid increases,and the pore volume corresponding to the peak is basically the same.The lead ion penetration curves almost overlap at four temperatures.(4)To study the properties of the floating particles and heavy metals in saturated porous media in the saturated porous medium,the results show that the particles in the process of the coupling migration process,and the transfer of the particles,and the flow of the concentration of lead ion and the concentration of lead ion,have shown that the particles in the coupled migration process have significantly increased the transfer of lead ions,and when the particles of silicon powder are enlarged,it has weakened the effect of the process.The presence of lead ions inhibits the migration of silica powder.When the particle size increases,the inhibitory effect weakens.With the increase of lead ion concentration,the relative concentration peak of silica powder in the flow liquid was decreased,and the pore volume corresponding to the peak was almost unchanged.In the process of migration,the peak concentration of silica powder compared with lead ions showed a phenomenon of accelerated migration.With the increase of the temperature,the relative concentration of silica powder in the fluid is decreased,and the pore volume corresponding to the peak value has a certain advance.The larger the diameter of silicon powder,the more irregular the penetration curve,and the smaller the penetration curve at different temperatures,similar to that of the single silicon powder.With the increase of temperature,the relative concentration of lead ions in the fluidized liquid is smaller and the corresponding pore volume is basically the same.