科研之友
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摘要
Oil and gas exploration activities generate a considerable wastewater, among which produced water is the most relevant. The chemical complexity of this stream (high ammonium and salt concentrations) adversely affects biological treatment and can be detrimental to sensitive organisms such as nitrifiers. This study addressed the nitrification of produced water from a Brazilian oil extraction platform. Laboratory-scale experiments have shown that nitrification activity could not be sustained with raw produced water in the long term. Nevertheless, when produced water was appropriately diluted, detrimental effects on nitrification were significantly reduced. Experiments evaluating effects of increasing salt concentrations on nitrification have shown that complete ammonium removal were achieved even at very high salt concentrations (up to 100 g NaCl/L). At 125 g NaCl/L, however, nitrifiers were completely inhibited and negligible ammonium removal was observed. Additional tests with no biomass and under similar operational conditions to those applied in previous experiments confirmed that biological nitrification was the most important mechanism of ammonium removal.
- 出版日期2017-4
