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Look at the chlorine residual data during chlorination of wastewater which consists of ammonia, organic matter, and microorganisms. Chlorine dosage (mg/L) 0.1 0.5 1.0 1.5 2.0 2.5 Chlorine residual (mg/L) 0.0 0.4 0.8 0.4 0.9 1.4 Calculate chlorine dose at the breakthrough point

Look at the chlorine residual data during chlorination of wastewater which consists of ammonia, organic matter, and microorganisms. Chlorine dosage (mg/L) 0.1 0.5 1.0 1.5 2.0 2.5 Chlorine residual (mg/L) 0.0 0.4 0.8 0.4 0.9 1.4 Calculate chlorine dose at the breakthrough point Correct Answer 1.5 mg/L

Concepts:
The graph between residual chlorine and chlorine dosage according to the given data points:

 Important Points

  • Note that whatever the chlorine added after reaching the breakeven point appears as residual chlorine. To understand this, the extra chlorine added after reaching the breakeven point is (2 - 1.5 = 0.5 mg/l).
  • This 0.5 mg/l extra chlorine will remain as residual, and therefore, total residual chlorine at a chlorine dosage of 2 mg/l will be  residual chlorine at breakeven point plus extra chlorine added after reaching breakeven point i.e. 0.4 + 0.5 = 0.9 mg/l (which is exactly same as given in question data )

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