Where a sufficient number of nitrifying organisms are present, nitrification can occur as shown by the dotted curve Nitrogenous biochemical oxygen demand, NBOD e Nitrification is usually Carbonaceous observed to occur from 5 to 8 biochemical BOD与CBOD、NBOD days after the start of the oxygen demand BOD incubation period BOD or CBOD Time Ultimate carbonaceous BOD BOD -day BOD BODs BOD curve BOD1与BOD5 34567891 Time, days
BOD与CBOD、NBOD BODL与BOD5
BOD测定注意事项: 般采用稀释法:降低有机物浓度,保证充足的嵱解氧 馏水、无机营养盐、确当的pH 制硝化耗氧时,可加入硝化抑制剂,如正甲基蓝 Ultimate carbonaceous BOD BOD curve 1: temperature > 20%:k>0.15 BOD curve 2: temperature 20C k=0. 15 BOD curve 3: temperature 20 C: k<0.15 01234 6789 Time, days 温度对BOD测定的影响
温度对BOD测定的影响 一般采用稀释法：降低有机物浓度，保证充足的溶解氧 蒸馏水、无机营养盐、确当的pH 工业废水往往需要接种和训化 抑制硝化耗氧时，可加入硝化抑制剂，如亚甲基蓝 BOD测定注意事项：