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Wastewater treatment


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Wastewater treatment

  1. 1. Kinds of water treatment:  Septic tank disposal systems  Water treatment plants Innovative systems are being developed to reclaim wastewater waters so that they can be used to irrigate fields, parks or golf courses. Some developers also say that rather than hiding the wastewater plants, they should come to expect sewage to be reclaimed at small cost producing flowers and shrubs in a park-like setting.
  2. 2.  22 million systems in operation  Half a million new systems are added per year  30 percent of the people in the US use septic systems
  3. 3. Geologic factors that can affect the suitability of a septic tank disposal system:  Type if soil  Depth of the water table  Depth to bedrock  Topography Reasons why most septic tanks fail:  Poor soil drainage
  4. 4. Stages of wastewater treatment:  Primary treatment  Screening  Sedimentation  Secondary treatment  Activated sludge  Disinfection of the wastewater  Advanced treatment  Chemicals  Sand filters or carbon filters
  5. 5. A troublesome aspect of wastewater treatment is the handling and disposal of sludge. The amount of sludge produced in the treatment process is conservatively estimated as about 54 to 112 grams per person per day, and sludge disposal accounts for 25 to 50 percent of the capital and operating cost of the treatment plant.
  6. 6.  To convert the organic matter to a relatively stable form  To reduce the volume of sludge by removing liquid  To destroy or control harmful organisms  To produce by-products whose use or sale reduces cost of processing the sludge
  7. 7. Final disposal of a sludge:  Incineration  Burying it in a landfill  Using it for soil reclamation  Dumping it in the ocean
  8. 8. The process of recycling liquid waste called the wastewater renovation and conservation cycle
  9. 9. Problems faced by this new technology in being more widely used:  We have a tremendous investment in more traditional wastewater treatment plants and are familiar with them.  There is a general lack of economic incentives to provide for new technologies  There is a general lack of personnel capable of designing, building and operating these systems. However, as more universities are developing true environmental engineering programs, this problem may be rectified