Biochemical Mechanism of Influence of Dilution Multiple on BOD Measurement
稀释倍数影响BOD测定结果机理的探讨

This paper discusses the biochemical mechanism of the influence of dilution multiple on the results of BOD measurement. The research show that the cause that dilution multiple influences BOD measurement results is the difference in the ratios of food to microorganism (F/M) in incubation systems. Under the same seeding condition, the greater the dilution multiple, the greater BOD and the constant of oxygen consumption rate would be, while BODu would basically keep constant. Further research results for the standard solution containing glucose and glutamic acid show that the peak values of active bacterial counts in both systems of different F/M values appeared in two days and the peak values of the system of higber F/M ratio appeared later than the other system. The oxygen consumption rate of bacterial population before endogenous phase is greater than that measured during the endogenous phase.