A novel in situ membrane technology was developed to remove nitrate (NO 3 − ) from groundwater. Membrane-fed hydrogen gas (H 2 ) was used as an electron donor to stimulate denitrification. A flow-through reactor fit with six hollow-fiber membranes (surface area=93 cm 2 ) was designed to simulate groundwater flowing through an aquifer with a velocity of 0.3 m/day. This membrane technology supported excellent NO 3 − and nitrite (NO 2 − ) removal once H 2 and carbon limitations were corrected. The membrane module achieved a maximum H 2 flux of 1.79×10 −2 mg H 2 /m 2 s, which was sufficient to completely remove 16.4 mg/L NO 3 − -N from a synthetic groundwater with no NO 2 − accumulation. In addition, this model in situ treatment process produced a high quality water containing <0.5 mg/L total organic carbon.
Water Research – Elsevier
Published: Aug 1, 2002
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