noun
Refers to the process or system of treating and disposing of sewage and wastewater.
この地域では下水処分が十分に行われていない。
Sewage disposal is not adequately carried out in this area.
下水処分施設の老朽化が問題になっている。
The aging of sewage disposal facilities has become a problem.
Compound of 下水 (sewage) and 処分 (disposal). The exact historical derivation is uncertain, but the term follows standard Sino-Japanese word formation patterns.