SOIL BLOCK FOR MULTISTAGE SEWAGE TREATMENT DEVICE AND SEWAGE TREATMENT DEVICE

摘要

PROBLEM TO BE SOLVED: To save time and labor in building a multistage soil treatment device and improve efficiency in treating sewage. SOLUTION: A soil block 10 is preliminarily formed by filling a porous container 11 with treating soil, and when the multistage soil treatment device is formed, the containers 11 with the soil blocks in them are arranged, covered with water-passing layers 3 and alternately piled up to form the multistage device.