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Ecology & Environment
Mahesh

27/04/22 08:30 AM IST

Project Sajal

In News
  • Based on the sharp shortage of drinking water, the ICD Patparganj & Other ICDs Commissionerate took an initiative under Swachhta project to provide safe drinking water facility to school students under the Project SAJAL, meaning full of water.
  • Aim- To provide safe drinking water to school students, which will enable the schools to have a nurturing environment for students to have their studies and activities. 
pH limit for water 
  • The permissible pH limit of drinking water as per BIS 10500 (2012) standard is 6.5 to 8.5.
  • However, the pH limit is exceeded beyond 8.5 in most districts, going up to 9.0. Calcium with a permissible limit of 200, as per the BIS standard, is up to 650.
  • Magnesium with a permissible limit of 100, as per the BIS standard, is up to 700.
  • Chloride with a permissible limit of 1000, as per the BIS standard, is up to 5000.
  • So, considering the salinity and dissolved solids and chemicals beyond permissible limits, the ground water is not safe for drinking.
Reverse Osmosis
  • In the RO process, the feed water enters the RO membrane under pressure, the water molecules pass through the semi-permeable membrane and the salts and other contaminants are not allowed to pass and usually more than 95% of the dissolved salts are removed from it.
  • The RO removes common pollutants from water including nitrates, lead pesticides, sulfates, fluoride, bacteria, pharmaceuticals, arsenic, chlorine and chloramines. RO filtration improves taste, odor and appearance of water by removing contaminants.
  • Clean Water leads to   Complete Development “स्वच्छ जल - संपूर्ण विकास”.

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