BIOL354 Lecture Notes - Lecture 10: Hydrogen Cyanide, Environmental Toxicology, Sand Filter
24 Jun 2020
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Effluent sampling and handling: sample is a snapshot of the effluent"s toxicological and chemical quality over time. Sampling must be extensive enough that it represents the discharge over time: both quantitative and qualitative variability commonly occurs in effluents both may affect toxicity, glass versus plastic. Those shipped in glass were more toxic & retained toxicity longer: for a tie glass is preferred. *petroleum refineries: many refineries located in ontario (5) and alberta (4), bc (2), qc (2), nfd (1 and nb (1, some refineries are now acting as distribution terminal or have been decommissioned. Contaminants in petroleum refinery effluents: phc, pahs, salts (naturally occurring brine from oil fields, sour water h2s, nh4, bottom sediment and water (bs&w) phc, salts, phenols, organic acids, hydrogen cyanide and carbon dioxide. Refinery wastewater treatment: wastewater treatment is site-specific and depends on level of treatment required(on site, regulations, similarly to municipal wastewater, treatment includes stages: Tertiary treatment: sand filtration, activated carbon, chemical oxidation,
