REHS Exam 2023/24- Wastewater

How much of the population is on individual sewage disposal systems? - ANSWER-1/3 of population What is the time limit for wastewater traveling to the waste water facility? Why? - ANSWER-2 days Fresh wastewater is easily treated and highly putrid Septic wastewater requires more treatment, cost, and energy How fast does wastewater move through sewer pipes? - ANSWER-2 feet per second Any slower and water tends to decay faster and become septic How far are manholes placed apart? Why? - ANSWER-300 - 500 feet away, to check and monitor sewage leaks How much water does an average American use per day? - ANSWER-50 - 100 gallons per day What time is sewage at its heaviest flow through the wastewater treatment plant? - ANSWER-3 - 9 PM What are the 5 types of wastewater sources? - ANSWER-1) Domestic Waste 2) Industrial Waste 3) Ground Water 4) Storm Drain Runoff 5) Municipal Waste Domestic Water - ANSWER-Sanitary waste out of a home, general businesses, and institution Sewage from toilets, water from showers/baths, sink/kitchen Industrial Waste - ANSWER-Waste discharged from a manufacturing plant Cooling water, canning, meat processors, hospitals, restaurants, refineries, plating process, and others that require treatment before dumping into common sewer system Ground Water - ANSWER-Can infiltrate the sewer system by the cracks in the sewer pipe