noun
Refers to the process of converting organic waste into compost. Often used in agricultural, environmental, and waste-management contexts.
生ごみの堆肥化は、家庭でも簡単に始められます。
Composting kitchen waste can be easily started at home.
この施設では、落ち葉の堆肥化を行っています。
This facility composts fallen leaves.
コンポスト is a loanword for a compost bin or the compost itself, often used in casual contexts, whereas 堆肥化 is a more technical term for the composting process.
Compound of 堆肥 (compost) + 化 (-ization, -ification). The word is a straightforward Sino-Japanese formation.