WATER PURIFYING METHOD AND WATER PURIFYING DEVICE FOR CLOSED WATER BASIN

摘要

PURPOSE:To purify the water quality over the entire part of a water basin with a simple constitution by disposing a filter tank with sand, taking water via the filter tank and filtering the water, then returning the water into water of a pond, etc., and ejecting air bubbles toward the return water. CONSTITUTION:The filter tank 2 embedding two pieces of water permeable pipes in parallel layer in the sand deposit are disposed on the bottom of the pond 1 as the closed water basin. These water permeable pipes are connected via water conduits 11 to a pump pit 7 disposed on the shore side. This pump pit 7 is provided with a grit chamber 12 connected with the water conduits 11 and a water circulating pump 10 consisting of a submersible pump is installed above the chamber. Water is pressurized by the water circulating pump 10 and is released from a release port 15 disposed in the water near the shore apart from a filter tank 2, thereby, the water is successively filtered through the filter tank 2. The air supplied through an air diffusion pipe 17 from a blower 19 for aeration is ejected from an aerator 16 toward the water released from the release port 15 to aerobically decompose the org. matter.