JP1746126S - Inner wall for underdrain - Google Patents

Abstract

This product is an inner wall body for an underdrain, and is shown in "reference enlarged exploded view showing the name of each part with the middle omitted", "reference enlarged end view showing how to use" and "reference drawing showing how to use". , constitutes a lower water catchment device arranged at the bottom of a sand filter pond for filtration or at the bottom of an activated carbon adsorption pond for activated carbon treatment among a plurality of treatment processes for treating water to be treated such as river water, groundwater, and wastewater. It is a part that The lower water catchment device has a filter layer made of granular material such as gravel, sand, anthracite, etc., placed thereon to evenly collect the filtered water flowing down from the filter layer. is dispersed evenly to clean the sand filter basin. That is, during the water collection process, the lower water catchment device collects filtered water flowing down from the filtration layer as indicated by the arrows in the "reference enlarged end view showing usage" and the "reference diagram showing usage". The liquid is introduced into the lateral circulation part through the upper external inflow and outflow holes arranged in the outer wall body, further introduced into the central circulation part through the inner inflow and outflow holes arranged in the inner wall body of the article, and the lower part arranged in the lower outer wall body. Take out from the outflow hole. At the time of backwashing, as shown by the same arrows in both figures, water and/or air is taken into the central circulation part through the lower outlet hole, and the lateral circulation part is introduced through the internal inflow and outflow holes of the article. air and/or water evenly distributed through the upper outer inflow and outflow holes are ejected to the filter layer to remove foreign substances in the filter layer. In addition, as shown in the "reference enlarged exploded view showing the name of each part with intermediate parts omitted" and the "reference view showing the method of use", it is also possible to install a perforated plate on the lower water catchment device and use it.