| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a wastewater treatment device capable of sufficiently performing the purification of wastewater by using a small and simple structured underground percolation type septic tank. SOLUTION: In this wastewater treatment device wherein the treated water flowing out from a combined septic tank 1 is purified in the underground percolation type septic tank 2 to be penetrated into the ground, a vertical multiple cylindrical treatment tank structure is adopted. In this structure, a water sprinkling pipe is installed in the center, and a first treatment layer 5, a second treatment layer 6, and a third treatment layer 7 are mounted sequentially around the outer circumference of the pipe. The first treatment layer 5 is a porous inorganic granular filter material-filled treatment layer for solid-liquid separation and aerobic digestion. The second treatment layer 6 is a water permeable block- made treatment layer with forced air supply for aerobic digestion and a food chain. The third treatment layer is a porous inorganic granular filter material- filled treatment layer for anaerobic digestion.</p> |
