Radio New Zealand - All Progra

Radio New Zealand - All Progra

How buried woodchips could help clean up waterways

24 May 2019 - 07:05

A project aimed at improving the quality of water flowing into rivers is being trailed on John Saywell's dairy farm near Geraldine. The three year project is the first major Canterbury field study of woodchip bioreactors that tests the removal of nitrates from drainage water. The bioreactor is a buried trench packed with woodchips and bacteria hosted by the chips. ESR groundwater scientist Lee Burbery hopes the bioreactor will break down nitrates in the water passing through it.