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Methane oxidation in biofilters measured by mass-balance and stable isotope methods

机译：通过质量平衡和稳定同位素方法测量生物过滤器中的甲烷氧化

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Simultaneous flux and isotope measurements on compost and sand biofilters showed that the fraction of CH4 oxidized, calculated from delta C-13 measurements using a closed system model (f(oxir,C)), averaged only 0.455 of the fraction oxidized based on mass-balance measurements (f(oxm)). The discrepancy between f(oxm) and f(oxir,C) may be partly due to complete oxidation of a portion of the inflow gas, thereby eliminating its contribution to the emitted methane on which isotopic measurements are conducted. To relate f(oxir,C) and f(oxm) a simple binary closed-system model is proposed that assumes that f(oxir,C) refers to only part of the inflow, P, and that the remainder of inflow (1 - P) is completely oxidized before reaching the outlet. This model is compared to the standard open-system model. The H-isotope fraction oxidized (f(oxir,H)) was determined for a subset of samples and found to be not significantly different from f(oxir,C). The carbon isotope fractionation factor, alpha(ox,C) = 1.0244, and the H-isotope fractionation factor, alpha(ox,H) = 1.2370, were determined by incubation studies. delta C-13 measurements indicated that the emitted flow was more strongly oxidized by the compost biofilters (f(oxir,C) = 0.362, f(oxm)=0.757) than the sand biofilters (f(oxir,C) = 0.222, f(oxm)=0.609).
机译：在堆肥和沙子生物滤池上同时进行通量和同位素测量，结果表明，使用封闭系统模型（f（oxir，C））根据C-13增量测量值计算出的CH4氧化分数平均仅为质量分数的0.455。平衡测量（f（oxm））。 f（oxm）和f（oxir，C）之间的差异可能部分归因于一部分流入气体的完全氧化，从而消除了其对进行同位素测量的甲烷排放的贡献。为了关联f（oxir，C）和f（oxm），提出了一个简单的二元封闭系统模型，该模型假定f（oxir，C）仅指流入P的一部分，其余为流入（1- P）在到达出口之前被完全氧化。将此模型与标准开放系统模型进行比较。确定了一部分样品的氧化的H同位素分数（f（oxir，H）），发现与f（oxir，C）没有显着差异。通过孵育研究确定了碳同位素分馏因子，alpha（ox，C）= 1.0244，H同位素分馏因子，alpha（ox，H）= 1.2370。增量C-13测量表明，堆肥生物滤池（f（oxir，C）= 0.362，f（oxm）= 0.757）比沙子生物滤池（f（oxir，C）= 0.222，f （oxm）= 0.609）。

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