Chapter 11.7 Flashcards
What is the first step of the wastewater treatment?
Preliminary Treatment. Wastewater passes through a bar screen which removes large objects. The wastewater then enters a grit tank where sand, gravel, and heavy materials sink to the bottom.
What is the second step of the wastewater treatment?
Primary Treatment. The wastewater flows to a primary settling tank where solid particles sink to the bottom of the tank.
What is the third step in the wastewater treatment?
Secondary Treatment. A biological treatment process removes organic matter from the water. By adding oxygen, micro-organisms grow and eat the organic matter. Remaining solids sink to the bottom of the clarifier.
What is the fourth step in the wastewater treatment?
Final Treatment. Water is disinfected with chlorine and then released back into Lake Ontario.
What is the fifth step in the wastewater treatment?
Solids Processing. Primary solids from the settling tank and secondary solids from the clarifier are sent to the digester. MIcroorganisms use organic matter as food and convert it into methane gas. Methane gas can be used for electricity and heating. 15 days later, bio-solids are incinerated, used as fertilizers, or sent to the landfill.
What is a sewer system?
A sewer system is a network of pipes that transports dirty of used water.
What is blackwater?
Water that contains feces or urine; also called sewage
What is greywater?
Water that has been used for cooking, bathing, laundry, or similar tasks
What is wastewater?
Water that has been used or contaminated by human activities
What is stormwater runoff?
Water that runs off roofs, lawans, or paved areas from precipitation. Usually contains road salt, pesticides, animal waste, and other contaminants.
What is a septic system?
A treatment plant in rural areas that treat wastewater on a much smaller scale. Includes a septic tank and drainage bed. Solids are trapped in the septic tank where bacteria slowly digests the waste. Liquid flows to the drainage bed where it slowly soaks into the ground.
Where is a septic system used?
Homes and small businesses in rural areas.
