Sewage Treatment Exam Questions with 100% Correct Answers

Two ways for wastewater treatment Correct Answer septic tank disposal systems Wastewater treatment plants Septic tank disposal systems Correct Answer for individual household not located in community with central treatment plans If you are far from a town or in a small town Wastewater treatment plants Correct Answer provide primary, secondary, advanced or tertiary treatment What do we want to do with storm-water Correct Answer we try to do is keep sanitary sewers separate from storm. In many cities, these were combined, so that when it rains the sewage treatment plants are overwhelmed. There is no need to treat storm water (rainfall) in a sewage treatment plant. Western cities mostly have them separated, eastern don't. Chicago doesn't and built the tunnel system to store waste when the flow is too high. Purpose of sewage treatment Correct Answer The main purpose of sewage treatment is to lower the BOD by allowing microbes to break down the waste (decomposition). Think of the waste as raw organic matter that organisms can use. We also use sewage treatment to convert ammonia to nitrate. Ammonia is toxic in aquatic systems, and nitrate isn't. We can also remove other chemicals if we need to. Most of sewage treatment is to slow the water down, let it settle out, and then put microbes to work.