Abstract

Nitrogen transformation was examined in the sequential stages of wastewater treatment in the Dan Region Wastewater Reclamation Project in Israel. It was shown that volatilization, assimilation and nitrification were the mechanisms responsible for ammonia removal from the water during various treatment stages. When the recharge basin dried, nitrification occurred, leading to removal of ammonia and accumulation of nitrate in the sand. Upon flooding the recharge basin nitrate was leached from the sand and accumulated in the groundwater, while ammonia was adsorbed to particles in the sand layers.

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