Abstract
ABSTRACTConcentrations OF Chloride, nitrate‐N, sulphate, sodium, ammoniacal‐N and potassium were monitored for six days in 20 riverine sediment‐water flow tank experiments. Only nitrate‐N and ammonical‐N showed consistent patterns over a period of time. Nitrate‐removal rates ranged from −15 mg N/m2.d (coarse material) to +49 mg N/m2.d (fine sediment) when the initial concentration of nitrate‐N was 2 mg/1. An increase in initial concentration to 11 mg/1 produced corresponding removal rates of 67–241 mg N/m2.d. Likely removal mechanisms are discussed. The results suggest management possibilities for stream bed ecosystems and raw water impoundments with respect to nitrogen cycling.
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