Abstract
Factors affecting nitrification in sea water were studied using laboratory-scale biological filters supplied with dilute solutions of (NH 4) 2SO 4 in sea water at 26 ± 2°C. As hydraulic loads were increased from 10.25 to 246 m 3/m 3 per day the total quantity of ammonia oxidized by a filter increased, although there was a decrease in the percentage oxidized relative to the influent concentration. Decreased pH adversely affected nitrification, which stopped completely at pH 5.5. Nitrification was inhibited at dissolved oxygen levels below 0.6–0.7 mg/l. Little difference was found in the performance of percolating (downflow) filters compared with upflow (media submerged) filters. The time taken for the onset of nitrifying activity in biological filters was variable but it is recommended that at least 4 weeks be allowed at 26 ± 2°C before it can be assumed that a filter is fully active.
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