Purification, Cleanup
noun, verbal noun, の adjective
Purify water to change it from being dirty. This is called purification. It's important to purify water before you drink it.
じょうか
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
私は、放射能汚染水を浄化する施設を設計しています。
I’m designing a facility to purify radioactive water.