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  2. 2. We are going to explain how waste water is treated to become purified water that can be safely put back into the river. WATER - TREATMENT PLANT
  3. 3. Waste water or sewage is collected from agriculture, industry and domestic use in Calahorra, Autol, Quel and Arnedo and taken to the Water-Treatment Plant.
  4. 4. COLLECTING OF WATER In the Plant it is mixed with rain water that has been collected from the streets of Calahorra, Autol, Quel and Arnedo through the storm drain. Storm tank
  5. 5. PRE-TREATMENT 1. SOLIDS ELIMINATION Water is pumped and forced to pass through 2 different grilles: the first one, holds back big solids floating on water; the second, smaller ones.
  6. 6. 2. DEGREASING AND DESANDING Then water is treated to remove sand and oils. Oil is the pollutant most difficult to get rid of.
  7. 7. 3. COLLECTING OF SOLIDS, SANDS AND OILS Solids, sands and oils are later compacted and deposited in a landfill
  8. 8. TREATMENT 1. PRIMARY DECANTATION The water passes to a decantation tank outdoor for the solid subtances fall at bottom, and form the primary sludge.
  9. 9. 2. BIOLOGICAL TREATMENT Now, it is time to remove organic matter. There are two types of bacteria that can do this : - First, anaerobic bacteria digest organic pollutants without oxygen. - Later, aerobic bacteria digest the remains in the presence of oxygen.
  10. 10. 3. SECONDARY DECANTATION The water is separated from the sludge produced for the bacterial action, and form the secondary sludge.
  11. 11. 4. SLUDGE TREATMENT As a result of bacterial digestion two different substances are produced: methane and compost. SLUDGE
  12. 12. 5. GAS LINE ELECTRICITY Compost is used in agriculture as a natural soil fertilizer. Methane is stored and used to produce electricity.
  13. 13. Finally the filtered and disinfected water is poured into the river. But this water can't be drinked.
  14. 14. This project has been realized by: Claudia Arenzana Iván Castellanos Marina Sota Carla Rangel We hope you have like it.