| 摘要 |
PROBLEM TO BE SOLVED: To improve the waste water treatment capacity of a yard in an inexpensive and simple way.SOLUTION: A flow path 4 capable of storing waste water in a yard 1 is formed in a longitudinal direction at one edge side to be a long side in the yard 1. The flow path 4 is formed to be dug lower than a yard surface 5 and is formed so that a heavy industrial machine such as a shovel is allowed to advance into the flow path 4 from the yard surface 5. Flocculant for sedimentation acceleration is fed to the waste water stored in the flow path 4, and after deposited matter that has sedimented in the flow path 4 by feeding of this flocculant is raked out by an industrial heavy machine such as a shovel, the waste water is collected into a drain pit 6. When there are a plurality of the yards 1, waste water stored in the other flow paths 4 is collected into one flow path 4 by a drain pump 8 and is discharged. At that discharging point, flocculant is fed. |
