Experimental Study On The Features Of The Permeation Pipe For Obtaining Water

The project of permeation pipes for obtaining water uses the horizontal permeation pipes with holes that buried in ground aquifer to obtain water through the infiltration and gravity of water. Nowadays, it has been widely used in industrial and agricultural production and daily life both in home and abroad.Permeation pipes is a kind of horizontal structure for obtaining water. It has many advantages that no other water intake works can compare when it is under a good hydrogeology condition, such as more easier to design and implement, low cost of the whole project, low operating cost, no need for pharmacy and better filtered water quality, strong adaptability to landform, high processing capacity to the sediment, easy accepted by the majority of users and so on. The water can be directly used as drinking water for human and animal with just slightly treatment or no treatment at all. So it is very meaningful to study the features of the permeation pipes for obtaining water.Based on the investigation on the practical project, and combined with the indoor model test, the features of the permeation pipe for obtaining water has been studied in this paper. The main results can be shown as follows:(1) When the valve of permeation pipe opens, the water obtained from the storage water in the water-bearing stratum, and with the time going the water is provided by runoff water. The water yield and turbidity of treated water both have the maximum value at the beginning, then decrease gradually and stabilize at last.(2) When the water flow remains fixed, the increase of the thickness of riverbed sand is equivalent to the increase of the thickness of aquifer and water filter material, which will increase the water yield and reduce the turbidity of treated water.(3) When the thickness of riverbed sand remains fixed, the increase of the water flow is equivalent to the increase of the waterhead in upper aquifer, and reduces the proportion of the water obtained from permeability pipe accounted for the total water amount, which will increase the water yield and reduce the turbidity of treated water.(4) When there is spring water replenishment, the spring water can all supplies to permeability pipe. The pattern of water yield and turbidity of treated water is similar to the one that without spring water replenishment.(5) When the influent sediment concentration remains fixed, the increase of the thickness of riverbed sand is equivalent to the increase of the thickness of water filter material, which will reduce the turbidity of treated water.(6) With the experiment going fine particles in water will gradually accumulate in the surface of filter material, which is equivalent to adding another layer of water filter material of which the integrated hydraulic conductivity is very small, and the filtering effect will be better. When the thickness of riverbed sand remains fixed, with the increase of the sand carried by inflow water, the fine particles accumulate in the surface of filter material, which leads to the decrease of the turbidity of treated water.(7) In order to apply the study results more widely, the paper used integrated permeability to analyze theory instead of riverbed sand thickness, and concluded the theoretical formula for the relation of the permeability of the water treatment material, runoff sediment concentration and permeation pipe effluent turbidity. The formula is in better accord with the experimental data, which coefficient determination is 0.96, showing a rather good degree of fitting. After using the actual measured data to test the fitting formula, the calculating results of fitting formula is in better accord with the actual measured data, which proves the fitting formula can be used in practical project.