GPHY 103 Lecture Notes - Lecture 10: Biochemical Oxygen Demand, Nonpoint Source Pollution, Silt
18 Dec 2016
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Week 4 lecture 1 no class because of thanksgiving. Topic: cech ch11 water quality, drinking water and wastewater treatment. What is water quality? dissolved matter: refers to composition of water, chemical and physical parameters (temperature, solid particles (sediment), dissolution processes by which a gas or solid (salt, mineral) is taken into. Water quality relative term, depends on the water(cid:495)s use: 4 canadian water quality guidelines (cwqgs) solution. Parameters: temperature, turbidity, pollutants and microbial parameters. Guidelines for most pollutants are tighter (lower) for aquatic life than for drinking water due to biomagnification/bioaccumulation. Aquatic life(cid:495)s more sensitive, breathes with gills, accumulates heavy metals and other contaminants. Organic substances and heavy metals: limits are very low concentrations, only iron, zinc, copper are tolerable for drinking. Most mineral salts are relatively harmless; have high limits or no regulated limit e. g. calcium. Temperature affects chemical, biological and physical processes: cold water. Can hold more dissolved oxygen (do or o2)
