SHORT SRT NITRIFICATION THROUGH SEEDING NITRIFYING BACTERIA INTO COLD, NON-NITRIFYING SEQUENCING BATCH REACTORS
Abstract:This study was developed to determine whether nitrifying bacteria grown on centrate at 20, 25, and 30°C could induce nitrification in sequencing batch reactors (SBRs) operating at 10°C with a solids retention time (SRT) of 4 days. A seeding rate of 6.7 mg VSS/L·d with biomass acclimated to 20°C achieved full nitrification in SBRs with hydraulic retention times (HRTs) greater than 43.3 hours. When seeding was stopped, effluent ammonia nitrogen (NH3-N) concentrations increased quickly, eventually reaching influent levels. When the HRT was reduced to 24 hours, partial NH3-N removal was achieved for all three of the nitrifying biomasses. Nitrification was not induced in any reactors when HRT was 12 hours.
Document Type: Research Article
Publication date: January 1, 2002
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