Exclusion
Removal, Elimination
If you reject and exclude something, you are doing exclusion to it. You could also call this removal.
はいじょ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
各下水道施設は、下水排除規準を満たす必要があります。
Each sewage facility needs to meet sewage removal standards.