New Wastewater Recycling System (Download PDF)

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New Wastewater Recycling System

  • Researchers from IISC in collaboration with the Centre for Sustainable Technologies (CST) , Bangalore have devised new wastewater recycling system. Nearly 180,000 liters of water have been saved with the use of new wastewater treatment and recycling system in a year in Karnataka՚s Berambadi village.
  • As per the Central Pollution Control Board, by 2030 India will need 1.5 trillion cubic meters water.

System Outlay

System Outlay
  • The wastewater recycling system has enabled the reuse of wastewater, reducing dependence on fresh water in the past.
  • The greywater treatment system was operated by the researchers for a year.
  • At the entry and exit points, different physicochemical and biological characteristics were monitored.
  • This system has successfully treated 667 liters of greywater daily.
  • Saves around 180,000 liters of water annually.
  • The system showed high REs (> 90 % for most of the parameters) .
  • This system can be further put economically into practice in a rural setting.

Working

  • From the hand wash sinks, the treatment system can pass the greywater through strainers.
  • These strainers screen out large food particles from water.
  • Next the water goes through three anaerobic sand bio-filters.
    • Tanks filled with locally available coarse gravel.
    • Medium gravel and sand.
  • To reduce nutrient levels of water, the bacterial biofilms breakdown nutrients in greywater.
  • From the kitchen sinks, the greywater is first allowed to pass through a grease trap and this helps in stripping off the top layer of oil and grease.
  • Next the water flows through an anaerobic sludge bioreactor. This is followed by a stratified biofiltration chamber.
  • Through aeration, the filtered water from both hand wash sinks and kitchen sinks is passed for ozonation (removes odors and colors from water) .
  • The treated water can then be used for domestic non-potable purposes such as for toilet flushing.

Performance of Every Treatment Stage

  • Quantified in terms of removal efficiencies (RE) of turbidity.
  • Total Suspended Solids (TSS)
  • Nitrate
  • Total phosphorus
  • Biological Oxygen Demand (BOD)
  • Chemical Oxygen Demand (COD)
  • Faecal coliforms (FC)

- Published/Last Modified on: May 31, 2021

Science/Technology, Down-to-Earth

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