JP1746124S - underdrain - Google Patents

Abstract

This product is an underdrainage device, and as shown in "reference enlarged exploded view showing the name of each part with intermediate parts omitted", "reference enlarged end view showing how to use" and "reference drawing showing how to use", etc. It is arranged at the bottom of the sand filter pond for filtration or the bottom of the activated carbon adsorption pond for activated carbon treatment among multiple treatment processes for treating water to be treated such as river water, groundwater, and wastewater. A filter layer made of granular materials such as sites is placed on the product, and the filtered water flowing down from the filter layer is evenly collected. is used for cleaning. That is, at the time of water collection treatment, as shown by the arrows in "reference enlarged end view showing usage" and "reference diagram showing usage", filtrated water flowing down from the filtration layer is pushed into the upper outer wall of the article It is taken into the side circulation part from the upper external inflow and outflow hole arranged in the inside, further taken into the central circulation part through the internal outflow and outflow hole arranged in the inner wall body, and taken out from the lower outflow hole arranged in the lower outer wall body . During backwashing, water and/or air are introduced into the central circulation portion through the lower outlet holes and into the side circulation portions through the internal inlet/outlet holes, as indicated by the same arrows in both figures. , the air and/or water evenly distributed through the upper external 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 product and use it.