Waste Water Treatment PDF

Waste water 09/01/20 treatment 22 LO: Keywords: Explain how waste water is Sewage treated Anaerobic Describe how sewage is Aerobic...

Waste water 09/01/20 treatment 22 LO: Keywords: Explain how waste water is Sewage treated Anaerobic Describe how sewage is Aerobic treated Sedimentation Compare the ease of treating waste, ground and salt water Starter: List the steps required to turn ground water into potable water. List the steps required to turn seawater into potable water.  a Surfac c Re e Rain Water Filtratio p Water n Ground Water Sterlisati on Desalination Sea Potable Water Distillation Water Reverse Osmosis Water cycles There is no new water on the planet: it is ancient water that is continually recycled. The water cycle is a natural cycle which we have lived off this for thousands of years and by drinking from wells, rivers, lakes and aquifers. Animals then excrete waste into the grounds where solids are broken down by bacteria and the water finds its way to groundwater. With growing population ways of treating sewage as well as way to provide clean The Water Cycle 3 2 1 Air 4 Clouds Condensati 5 on 7 Ground water Evaporatio 6 n 8 Ocean Percolation Precipitatio n Run-off skills development Urban lifestyles and industrial processes produce large amounts of waste water that require treatment before being released into the environment. Sewage and agricultural waste water require removal of organic matter and harmful microbes. Industrial waste water may require removal of organic matter and harmful chemicals. We produce vast amounts of waste water that needs to be treated before it goes back into the environment. From domestic water to water used in agriculture and industry- it all What are the sources of waste water? Urban areas Domestic waste water from domestic washing machines, dishwashers and showers also require treatment. Industrial waste water from cleaning cycles, solvent usage and cooling systems – this may contain pollutants that require extra treatment before going back to fresh water treatment. Agriculture is the biggest use of water. Agricultural waste water has many nutrients in it which can cause eutrophication. Organic matter and microbes must be removed.  Waste Water Sources Domestic Agricultural Industrial Requires removal of organic  Waste Water Sources Domestic Agricultural Industrial Requires removal of harmful  Waste Water Sources Domestic Agricultural Industrial Requires removal of harmful How does drinking water get to your home? Click for the video and find out more  Sewage treatment includes: Screening and grit removal Sedimentation to produce sewage sludge and effluent Anaerobic digestion of sewage sludge Aerobic biological treatment of effluent Describe each of these steps- what is the process happening and what is removed Then, have a go at the worksheet which is indicated on the next slide 1. Grit and large solids like non-biodegradables and plastics, solid waste disposed of at landfill sites. 2. Mechanical removal of organic compounds and bio-solids by sedimentation. Solid matter known as sewage sludge settles at the top. This is removed for further processing the remaining water moves into the secondary treatment phase. 3. a) without oxygen b) Sewage sludge is broken down into CO2, methane gas and bio-solids. 4. a) Fuel from an organic source/ living matter, such as methane from cows b) As above 5. a) with oxygen b) To make sure that the water is safe to drink and for the environment 6. To make sure it meets the standards set by the environment agency for cleanliness.