| Groundwater is one of the important sources in human. In the human society,it is playing an increasingly important role in economic development. In recentyears, along with the fast development of social production, the influence ofhuman activities on the ecological also came to worst. The popularity offertilizer in agricultural production, unreasonable, irregular farming makes thefragile land face the verge of collapse. In the soil-water system loop, humanactivities caused a great disturbance on the groundwater environment, andcontinued to deepen, especially in the soil ecosystem and interference for normaloperation of the water cycle system. In more and more serious waterenvironment, the problem of pollution of groundwater resources is especial.Groundwater pollution has become increasingly serious under the influence ofhuman activities, water pollution is becoming more and more prominent. Manyscholars put forward many kinds of prevention and cure measures of biology,physics, chemistry and so on for to groundwater environment, but there are thedisadvantages of economical efficiency, not easy to a wide range of promotion. Therefore, facing increasingly serious situation of groundwater pollution,exploration for economy, practical, universal groundwater pollution preventionand control measures is of great significance.This paper is based on fine particulate matter diving into the riverbedsediment reduction effect of groundwater pollution of channel managementservice station in Shanxi Province. On the basis of indoor soil columninfiltration simulation test combining wastewater infiltration, and chemicalanalysis of sediment nutrient content of matrix and effluent water. Analysis ofcement diving into the sediment substrates of nutrient elements in sewage tackleeffect. This technology has positive significance to the reduction of groundwaterpollution,provide theoretical basis and technical support for the furtherpromotion and application of measures for groundwater pollution preventionand control.Experiment chooses river sediment of FenHe water QingXu WenNaShe,LiuDu country and YuanWo quality source vortex water engineering section asthree river sediment of experiment. Choosing HuYu river surface water inWanBailin section as infiltration water. Choosing fine clay particles, cementparticles of fly ash, glass sand as fine particle materials. Through thepermeability of fine particulate matter into sediment effect test, permeability offine particulate matter effect, Cchoosing cement as permeability materialsbecause of its effect of permeability significantly and easy operation. Further,based on concrete sewage infiltration into sediment substrates of nutrient elements and related pollution indicators in sewage tackles effect,test found thecement into the river sediment of nutrient elements in sewage tackle effect isobvious. Test the following conclusions:A.The fine particulate matter into the river sediment of permeability andeffect:a.Fine particles can significantly lower sediment substrates water infiltrationability, Water steady infiltration rate was reduced by40%, the cumulativeinfiltration volume by46%b.No fine particles diving accord with Kostiakov infiltration process underthe condition of two parameter model, the fitting degree is0.9997; With fineparticles diving better conform to the Kostiakov infiltration process of threeparameter model, the fitting degree of0.9998.B.Very fine particulate matter diving into canals matrix material comparisontest:a.Fly ash diving into the river sediment has obvious effect of permeability,the stability of soil water infiltration rate decreased by18.02%.Due to the smallproportion of its own, it is not easy to dive in the water environment, and causehuge loss of material and waste, so practice generalization is poor.b.Clay diving into river sediment has obvious effect of permeability, thestability of soil water infiltration rate decreased by11.82%. As a result of theclay preparation process is time-consuming, it should not be in a wide range ofapplication. c.Cement diving into river sediment has obvious effect of permeability, thestability of soil water infiltration rate decreased by22.85%. Its purchase iseconomic, simple and easy popularization, the experiment proved to beeconomical is practical and ideal permeability particles.d.Glass sand diving into the river sediment has no effect of permeability.Because the particle size of glass sand itself is greater than the sediment matrixpore and not reach the ideal effect of diving.C.Influencing factors of permeability of fine particle material into canalsmatrix:a.Cement into water head: sediment soil relative moisture content, sedimenttexture, sediment bulk density, cement particles into or not, and amount ofcement are important factors influencing the permeability function.b.Cement head impact: The higher the dive into the water, cement intosediment ability stronger, the stronger the effect on water permeability.c.Sediment texture effects: Sediment sand matrix substrate water infiltrationability stronger, the greater the soil soil water infiltration capacity is smaller, thehigher the matrix with sediment substrates from light to heavy, the smaller thepermeability of cement into the sediment effect.d.Sediment bulk density effect: With the increase of the sediment bulkdensity matrix, the cement into the sediment ability weak, reduced thepermeability of cement into the sediment. e.Cement way into effect:12h on applying cement concrete solution thaninstant solution way has better permeabilityf.Dive into the cement quantity: the amount of cement and water infiltrationcapacity matrix is in negative correlation in a certain range of0kg/m2to3kg/m2, with the increase of cement content, the permeability of cement into thesediment effect increased.D.Cement diving into sediment effect on sewage nutrient elements:a.Cement into the river sediment of nitrate nitrogen in sewage tackle rateincreased by54.9%,64.4%and64.4%. But as a result of nitrate nitrogenleaching leading role, the actual effect is not ideal.b.Cement into the river sediment of ammonium nitrogen in sewage tacklesrate was95.47%,98.87%,83.71%;c.Cement into the river sediment phosphorus removal in wastewater tacklerate was71.9%,66.4%,71.2%; The role of received the influence of the organicmatter content in the matrix, the higher organic matter content, the smallertackles role.d.Cement into the river sediment of potassium in sewage tackles rate was74.4%,68.5%,58.2%;e.Cement into the river sediment in sewage COD block rate reached59.7%,61.1%and57.3%, respectively, For BOD tackles rate reached53.51%,52.02%,54.19%. Tackle received the influence of sediment organic matter content in the matrix, the higher organic matter content, the measures of COD, BOD in sewagetackles the effect is not obvious.Cement diving into river sediment substrates for sewage nutrient elementsin the block effect is obvious, effective prevention and control of groundwaterpollution by nutrient elements. The technology provide theoretical basis andpractical reference for FenHe river basin of the underground water protectionand management. Due to the limitations of indoor test, the test conclusion mustbe different in real practice, still need the further field practice verificationexperiment was carried out. |
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