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Turbidity

  • February 15, 2021
  • Posted by: OptimizeIAS Team
  • Category: DPN Topics
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Turbidity

Subject: Environment

Context: Debris and silt across Ganga after Uttarakhand flood raised turbidity of water impacting water supply in Delhi.

Concept:

  • It is the degree to which the water loses its transparency due to the presence of suspended particulates. It is considered good measure of quality of water.
  • Turbidity is a measure of relative clarity of a liquid and is measured in Nephelometric Turbidity Units (NTU). Debris, silt and mud in the water are among the reasons behind high turbidity.
  • WHO establishes that the turbidity of drinking water shouldn’t be more than 5 NTU, and should ideally be below 1 NTU.
  • A turbidity measurement could be used to provide an estimation of the TSS (Total Suspended Solids) concentration, which is otherwise a tedious and difficult parameter to measure.

Sources/Factors of turbidity include:

  • Phytoplankton
  • Sediments from erosion
  • Resuspended sediments from the bottom (frequently stir up by bottom feeders like carp)
  • Waste discharge
  • Algae growth
  • Urban runoff

Impact of turbidity

  • Affects drinking water quality
  • Suspended particles absorb heat from the sunlight, making turbid waters become warmer, and so reducing the concentration of oxygen in the water
  • Many organisms can’t survive in warm water
  • It also helps the attachment of heavy metals and many other toxic organic compounds and pesticides
Environment Turbidity
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