Nitrified Secondary Treatment Effluent by Plastic-Media Trickling Filter,
POLYTECHNIC INST OF NEW YORK BROOKLYN DEPT OF CIVIL ENGINEERING
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Biological nitrification of secondary effluent by a two-stage trickling filter was throughly investigated under the optimum pH and temperature conditions. It was found that the efficiency of the trickling filter plant was a function of influent nitrogen concentration, nitrogen loading, and filter depth. The quantity of ammonia nitrogen removed was higher in filter 1 than filter 2. The continuously oxidized ammonia nitrogen resulted in the accumulation of nitrite and nitrate in the system, however, the production of nitrite started to decrease with increasing the nitrate when ammonia nitrogen remaining in the wastewater approached to its lowest level. Both pH and DO decreased and increased after the wastewater traveled through filter 1 and filter 2, respectively. Dissolved oxygen never became the growth-limiting factor because its concentration was over 3.0 mg1. The alkalinity requirement for fixed-film biological nitrification is somewhat different, from that observed from suspended growth system.