Sewage Treatment APES Flashcards

8070394589	Preliminary Treatment	Physical process; uses screens and a grit tank to remove large floating objects (includes items like wood, rocks, and even dead animals;) debris and grit and allows settling.	0
8070565717	Bar Screen	A device that removes large objects from wastewater.	1
8070754164	Primary Treatment	Temporarily holds the sewage in a basin where heavy solids can settle to the bottom while oil, grease and lighter solids float to the surface. Fats, oils and grease (FOG) are then skimmed off	2
8071069929	Primary Clarifier	A large tank in which suspended material or organic fecal material settles out and is collected by a scraper system at the bottom of the tank. A skimmer on the top surface of the tank removes oil and floating material.	3
8070819578	Secondary Treatment	A biological process in which aerobic bacteria remove as much as 90% of dissolved and biodegradable, oxygen-demanding organic wastes.	4
8070825759	Advance Treatment	Uses a series of specialized chemical and physical process to remove specific pollutants left. (nitrates and phosphates)	5
8071090401	Biological Nutrient Removal (BNR)	Uses series of biological, chemical and physical processes to remove specific pollutants left (especially nitrates and phosphates).	6
8070925226	Disinfection Stage	Water is chlorinated to remove coloration and to kill disease-carrying bacteria and some viruses. Other methods include ozonation, UV light, and reverse osmosis.	7
8071139088	Problems of Using Sludge in Agriculture	- Human/animal health problems associated with bacterial wastes contaminating food/feed crops - Potential groundwater/soil/plant contamination (toxins, contaminants, heavy metals, leachates) - Incorporation of toxins/heavy metals into the food chain - Field runoff resulting in surface water contamination (eutrophication/oxygen depletion of surface waters due to wastes high in nitrogen or phosphorus)	8
8071160028	Problems of Burying Sludge in Landfills	- Greenhouse gases, such as methane, produced during anaerobic decomposition can escape into the atmosphere and contribute to global warming - Environmental effects associated with transportation of solid waste - Takes up a considerable amount of landfill space (resulting in expansion or new development of landfills) - Potential groundwater contamination (toxins, contaminants, heavy metals, leachates)	9
8071174469	Activated Sludge	A mixture of sludge and debris-feeding organisms	10
8071184953	Anaerobic Sludge Digestor	A device that allows bacteria to feed on organic waste in the absence of oxygen and generates power to engine plant.	11
8071217372	Advantages of Activated Sludge	The process produces methane, that directly as fuel, in combined heat and power gas engines or upgraded to natural gas-quality biomethane. - The nutrient-rich digested also produced can be used as fertilizer.	12
8071235718	The Clean Water Act	Surface water used, sets quality standards, WQI	13
8071235719	Safe Drinking Water Act	Groundwater used as drinking water	14