GPHY 103 Lecture Notes - Lecture 12: Biochemical Oxygen Demand, Settling, Trickling Filter

• School: Queen's University
• Department: Geography
• Course: GPHY 103
• Professor: Melissa Lafreniere

Document Summary

Remediation is not part of the (preventative) multiple barrier approach (mba)! 3 steps of preliminary treatment of drinking water: screening, flocculation, sedimentation (disinfection) not preliminary treatment. Both fluorination and chlorination are in the final treatment of drinking water. Flocculation very find suspended sediment won(cid:495)t naturally settle out. Wastewater treatment (of sewage and storm water) review and finishing off this section. Typically at low points in the city; gravity carries waste downwards; downstream from so the sediment binds to form bigger/heavier particles that will settle out of the water drinking water treatment. Complete treatment has 3 stages: primary; remove suspended solids, secondary; remove fine solids and organic matter, tertiary; cleansing step. Primary; similar to preliminary drinking water treatment. Screening then (cid:494)grit chamber(cid:495) (large settling tank; especially sand in storm water). Next settling tank; similar to drinking water sedimentation. Secondary treatment; main foal = organic matter (om) removal to reduce biological oxygen demand (bod).