Sewage Treatment Essays -- essays research papers

Sewage TreatmentWhere does the waste water go? When water goes vote down your sink or toilet, it travels through small pipes to much bigger trunk sewers. The sewer systems are built to the slope of the ground slightly the Elbow and Bow Rivers. This slope al imprints most of the waste to go down by gravity, rather than expensive pumps, to one of four plants. To handle low areas, which do not have enough slope, pumping stations have been made.How is wastewater treated? Wastewater give-and-take in Calgary involves the following processes Preliminary treatment The water flow is slowed down to get the sand, gravel and other materials to even up out into grit tanks. The waste is thence strained by check screens, which remove large solid objects like sticks. All material accumulate by grit tanks and bar screens is washed and then taken to a landfill. Primary treatment The screened water flows into settling tanks, allowing more solids to settle to the fag end of the tanks. Also at t his stage, "scum" (oils and greases) are scraped off the top of the water. This is wield to large tanks, for disposal. Secondary treatment The half treated water then goes by gravity to covered aeration tanks where it is mixed with "activated sludge" which contains oxidative bacteria. The bacteria eat the organic things remaining in the water. In raise to provide a good environment for the bacteria to multiply, air is handle and spread into the water by blowers. The water, air and ...