Madsen H I, Vollertsen J, Hvitved-Jacobsen T
Section of Environmental Engineering, Aalborg University, Sohngaardsholmsvej 57, 9000 Aalborg, Denmark.
Water Sci Technol. 2007;56(1):267-75. doi: 10.2166/wst.2007.461.
Reaeration is a central quality parameter for the performance of environmental systems such as ponds receiving urban and road runoff. Tracer gases can be used to measure reaeration rates in these systems. The methods comprise injection of a volatile tracer into an environmental system and subsequently measurement of the emission of the volatile tracer. The physical basis of such methods is the existence of a constant ratio between the air-water mass transfer coefficient for oxygen and the corresponding mass transfer coefficient for the volatile tracer gas. This constant ratio is often not clearly defined in the literature due to difficulties in both experimental procedures and handling of data. In this study such methods are evaluated and an experimental procedure and a corresponding data processing procedure for a general and reliable determination of mass transfer rates are presented. Propane is selected as an example of an appropriate tracer gas and the ratio between the mass transfer coefficients of oxygen and propane is determined.
复氧是诸如接纳城市和道路径流的池塘等环境系统性能的一个核心质量参数。示踪气体可用于测量这些系统中的复氧速率。这些方法包括将挥发性示踪剂注入环境系统，随后测量挥发性示踪剂的排放。此类方法的物理基础是氧气的气 - 水传质系数与挥发性示踪气体的相应传质系数之间存在恒定比值。由于实验程序和数据处理方面的困难，该恒定比值在文献中常常没有明确界定。在本研究中，对这些方法进行了评估，并给出了用于普遍且可靠地测定传质速率的实验程序和相应的数据处理程序。选择丙烷作为合适的示踪气体示例，并测定了氧气和丙烷传质系数之间的比值。
