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Q: Which of the following process is adopted to remove odour and taste due to volatile gases like hydrogen sulphide and algae in a water treatment plant?
  • A. Filtration
  • B. Sedimentation
  • C. Disinfection
  • D. Aeration
Correct Answer: Option D - Aeration– Aeration brings water and air in close contact in order to remove dissolved gases (such as carbon dioxide) and oxidizes dissolved metals such as iron, hydrogen sulfide and volatile, organic chemicals (VOCs). Aeration is often the first major process at the treatment plant. Why we use Aeration – • Oxidation of organic matter • To increase dissolved oxygen content • To reduce the concentration of taste and odour causing substances, such as hydrogen sulfide and various organic compounds, by volatilization/ stripping or oxidation • To oxidize iron and manganese, rendering them insoluble • Flocculation of colloids in sewage influent • To remove those compounds that may in some way interfere with or add to the cost of subsequent water treatment
D. Aeration– Aeration brings water and air in close contact in order to remove dissolved gases (such as carbon dioxide) and oxidizes dissolved metals such as iron, hydrogen sulfide and volatile, organic chemicals (VOCs). Aeration is often the first major process at the treatment plant. Why we use Aeration – • Oxidation of organic matter • To increase dissolved oxygen content • To reduce the concentration of taste and odour causing substances, such as hydrogen sulfide and various organic compounds, by volatilization/ stripping or oxidation • To oxidize iron and manganese, rendering them insoluble • Flocculation of colloids in sewage influent • To remove those compounds that may in some way interfere with or add to the cost of subsequent water treatment

Explanations:

Aeration– Aeration brings water and air in close contact in order to remove dissolved gases (such as carbon dioxide) and oxidizes dissolved metals such as iron, hydrogen sulfide and volatile, organic chemicals (VOCs). Aeration is often the first major process at the treatment plant. Why we use Aeration – • Oxidation of organic matter • To increase dissolved oxygen content • To reduce the concentration of taste and odour causing substances, such as hydrogen sulfide and various organic compounds, by volatilization/ stripping or oxidation • To oxidize iron and manganese, rendering them insoluble • Flocculation of colloids in sewage influent • To remove those compounds that may in some way interfere with or add to the cost of subsequent water treatment