![A denitrification wall diagram.](http://static.sciencelearn.org.nz/images/images/000/000/886/full/Denitrification-wall-diagram20160307-30777-qsg0ji.jpg?1674165136)
A denitrification wall uses sawdust to remove nitrates from the groundwater and increase microbial denitrification (using bacteria).
A denitrification wall uses sawdust to remove nitrates from the groundwater and increase microbial denitrification (using bacteria).