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研究了一种利用溶解氧(DO)消耗来测定水样生物可降解溶解性有机碳(BDOC)的方法。从BDOC标准溶液配方、反应温度、流速、生物量等多个方面对实验条件进行考察,确定了最优测定方案。将乙酸钠和葡萄糖按碳含量比例50/50混合,经过梯度稀释制备BDOC标准溶液,将其充分曝气处理后,以7.5 m L/min流速经过50 cm3生物量的微型测试用生物滤柱,测定进水和出水之间的DO差值,建立DO消耗标准曲线。以相同操作条件测定待测水样的进出水DO差值,代入标准曲线拟合方程即可求出水样BDOC。利用该方法对实际水样的BDOC进行了测定,与动态循环法的测定结果近似。结果表明,本方法用于测定BDOC是可行的,具有结果准确、耗时短、操作简单等优点,可实现对实际水样BDOC的现场监测。
A method for determining the biodegradability of dissolved organic carbon (BDOC) using dissolved oxygen (DO) was studied. The experimental conditions were investigated from the BDOC standard solution formulation, reaction temperature, flow rate, biomass and other aspects to determine the optimal determination program. The sodium acetate and glucose were mixed according to the carbon content ratio of 50/50, and the BDOC standard solution was prepared by gradient dilution. After full aeration treatment, the biofilter was passed through a mini-test of 50 cm3 biomass with a flow rate of 7.5 m L / min, Determination of DO difference between influent and effluent, the establishment of DO consumption standard curve. Under the same operating conditions, the difference between the influent and the influent DO of the water sample to be tested is determined and substituted into the standard curve fitting equation to obtain the water sample BDOC. Using this method, the actual water sample BDOC was measured, which was similar to the result of dynamic circulation method. The results show that this method is feasible for the determination of BDOC, with the advantages of accurate results, short time-consuming and simple operation, which can realize on-site monitoring of actual water samples BDOC.