Karakter Pertumbuhan dan Aktivitas Nitrifikasi Kultur Mikroba N-Sw

ABSTRACT The growth character and nitrification activity of nitrifying cultures (N-Sw). The culture of nitrifiers (N-Sw) was obtained from acclimated sludge of sawit palm oil industry wastewater. The growth and nitrification activity of those cultures were investigated. The result shows that the growth and nitrification activity attained optimum at pH 7-8, and temperature of 30 0C. The culture of nitrifiers was still growing at pH 5, but the nitrification activity was not detected. The growth of nitrifiers and the nitrification activity was inhibited at 40 0C. The ammonium conversion rate reached 0,088-0,090 mg NNH 4 +/L/hour/g biomass. The rate of ammonium conversion in the bioreactor increased to 0.630 mg N-NH4 +/L/hour/g biomass as the pH maintained at 7.5-8 and dissolved oxygen at 3-4 mg/l O2. Key words: nitrifying culture, ammonium, ammonium convertion rate