unit 9 and 10 chemistry
- Created by: pheath1999
- Created on: 09-05-21 11:36
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- Using Resources and Chemistry of the Atmosphere
- Waste Water and Sewage
- Atmospheric pollutants from fuels
- Polluting the atmosphere
- 1. Sewage is screened which involves removing large bits of material.
- 2. Sewage is allowed to stand in sediment tank so that heavy solids sink to the bottom producing sludge.
- 3. The effluent in tank is removed and treated by biological aerobic digestion.
- 4. Air is pumped through water to encourage aerobic bacteria to break down the organic matter
- 5. The sludge from the tank is also removed and transferred into smaller tanks. Here it gets broken down by the anaerobic respiration.
- 6. Anaerobic digestion releases methane gas which is used as an energy source and the remaining waste is used as fertiliser.
- 7. For waste water containing toxic substance, additional stages of treatment may be used to add extra chemicalss.
- 6. Anaerobic digestion releases methane gas which is used as an energy source and the remaining waste is used as fertiliser.
- 5. The sludge from the tank is also removed and transferred into smaller tanks. Here it gets broken down by the anaerobic respiration.
- 4. Air is pumped through water to encourage aerobic bacteria to break down the organic matter
- 3. The effluent in tank is removed and treated by biological aerobic digestion.
- 2. Sewage is allowed to stand in sediment tank so that heavy solids sink to the bottom producing sludge.
- Pollution can occur: in water, from sewage, fertlisers or toxic chemicals.
- Incomplete combustion = not enough oxygen, meaning instead of carbon dioxide you get carbon monoxide or soot which is bad for environment.
- problems with INCOMPLETE combustion = carbon monoxide is poisonous to humans. It is also colourless and odourless so it is difficult to detect.
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