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Promising results from denitrification wall


A world-first denitrification wall at Silverstream, North Canterbury designed to reduce high groundwater nitrate levels is working as anticipated.

The trial is led by the Institute of Environmental and Scientific Research (ESR).

So far the nitrate levels in groundwater have been reduced from 7.1mg/L to 0.5 mg/L by the wall at Silverstream Reserve.

The 25m-long wall, installed eight weeks ago, is a world-first: no denitrification wall has ever been tested in a fast-flowing gravel aquifer system such as the one at Silverstream.

ESR senior scientist Lee Burbery says the wall is working as anticipated. Read more