Examkin

Soru

Zorluk: ZorPurification and Treatment of Water for Supply

Match each municipal water purification stage or chemical additive on the left with its precise operational mechanism on the right.

  • AerationExpels volatile dissolved gases and oxidizes soluble iron(II) into insoluble precipitates
  • Addition of Potash AlumNeutralizes negative charges on fine clay colloids to promote flocculation
  • Sand FiltrationStrains out fine suspended particles and micro-flocs remaining after sedimentation
  • Addition of Slaked LimeAdjusts the pH of acidic treated water to prevent distribution pipe corrosion

Cevap

Aeration matches with expelling volatile gases and oxidizing soluble iron(II); Addition of Potash Alum matches with neutralizing negative charges on clay colloids for flocculation; Sand Filtration matches with straining out fine suspended particles remaining after sedimentation; Addition of Slaked Lime matches with adjusting pH of acidic water post-coagulation.
Aeration oxidizes soluble iron and removes dissolved gases. Potash alum supplies trivalent cations to neutralize negative charges on colloidal clay. Sand filtration physically retains fine suspended particles. Slaked lime neutralizes acidity induced by alum coagulation.

Adım Adım Çözüm

1
Analyze the primary chemical and physical effects of Aeration.
Spraying raw water into air maximizes gas exchange, driving off dissolved volatile species (H2SH_2S) and converting soluble Fe2+Fe^{2+} ions to insoluble Fe(OH)3Fe(OH)_3 precipitate.
Aeration targets volatile odors/tastes and dissolved metals rather than solid particulate filtration.
2
Analyze the coagulating action of Potash Alum (KAl(SO4)2⋅12H2OKAl(SO_4)_2 \cdot 12H_2O).
Trivalent Al3+Al^{3+} ions neutralize negative charges on suspended clay colloids, causing them to coalesce into larger settleable flocs.
Fine clay particles do not settle spontaneously due to mutual electrostatic repulsion.
3
Determine the function of Sand Filtration.
Water percolating through sand layer beds leaves behind non-settled micro-particles.
Filtration serves as a final physical straining stage after bulk sedimentation.
4
Evaluate the requirement for Slaked Lime (Ca(OH)2Ca(OH)_2).
Neutralizes acidity produced during alum hydrolysis, raising the pH to safe alkaline levels.
Acidic water damages metal distribution pipes through corrosive action.

Anahtar Kavram

Operational mechanisms of chemical and physical processes in town water supply treatment
Bu soruyu puanla

Konular

Purification and Treatment of Water for Supply

Bu konudan daha fazla soru