稀释倍数影响BOD测定结果机理的探讨

本文探讨了稀释倍数影响BOD测定结果的生化机理.研究结果表明,稀释倍数不同所引起的BOD测定值不同的原因在于培养体系内食料微生物比F/M值的不同.在相同接种条件下,稀释倍数愈大,BOD测定值和耗氧速率常数K值也愈大,而其BOD_u值基本不变.对标准葡萄糖-谷氨酸溶液来说,不同F/M值的两个培养体系的活菌总数峰值均在两日内出现,且F/M值大的其峰值相对滞后出现;细菌种群在内源呼吸期之前的耗氧速率较大,内源呼吸期的耗氧速率较小.

Biochemical Mechanism of Influence of Dilution Multiple on BOD Measurement

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.