A model for sediment oxygen demand (SOD; g/m2-d) in lakes is hypothesized and developed for aerobic (BSOD) and chemical (CSOD) components. The CSOD uses first order kinetics while BSOD uses Monod kinetics with respect to oxygen concentration. The model is calibrated using laboratory data for sediments from 4 water bodies—one is heavily impacted by eutrophication and wastewater discharges while the other 3 lay on the forested Precambrian shield. The model shows excellent agreement with the laboratory data for all water bodies (generally at the 1% level of significance) for temperatures between 4 °C and 22 °C. The model implies that CSOD is diffusion controlled at one temperature, but strongly influenced by anaerobic biological processes over a range of temperatures. Future research should aim to incorporate overlying water velocity and sediment biodecomposability into kinetic expressions to complete model development.
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Walker et al. (1986) studied this question.
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