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Dissolved oxygen and inorganic carbon dynamics in a high-energy coastal environment near Victoria BC’s untreated municipal sewage outfallsKrogh, Jeremy 01 May 2017 (has links)
Wastewater disposal often has deleterious impacts on the receiving environment. Low levels of dissolved oxygen are of particular concern. Here I investigate the impacts on dissolved oxygen and carbon chemistry of screened municipal wastewater in the marine waters off Victoria, B.C., Canada. I analyzed data from a series of undersea moorings, ship-based monitoring, and underwater remotely-operated vehicle video. I used these observations to construct a two-layer box model of the nearfield receiving environment. Despite the lack of more advanced treatment, dissolved oxygen levels near the outfalls are well above the commonly used 63 umol kg-1 hypoxic threshold and that the outfalls’ impact on water column oxygen is likely less than a few umol kg-1. Likewise, dissolved inorganic carbon is not elevated and pH not depressed compared to the surrounding region. Strong tidal currents and the cold, well-oxygenated waters of Victoria’s marine environment give these waters a high assimilative capacity for organic waste. / Graduate / 0595 / 0403 / 0543 / jeremykrogh@gmail.com
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