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| 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 |
