Environmental Engineering

Drinking & Wasterwater treatment

Water Treatment

Hardness is a caused due to the existence of minerals in water (calcium, magnesium, iron, ...)
Hardness is measured in united of mg/L as CaCO3 or meq/L

Calculate Concentration as CCaCO3

Concentration C in mg/L
Atomic/Molecular Weight mg/mmol
Equivalent Weight {{EW()}} mg/meq
Concentration meq/L {{Cq()}} meq/L
Concentration as CCaCO3 {{CCaCO3()}} mg/L

Total Hardness

Ca2+ Mg2+ Fe2+

Fe3+ Mn3+ Sr2+

Al3+
TH {{TH()}} meq/L TH as CaCO3 {{THCaCO3()}} mg/L

Breakthrough - ION Exchange

Initial Hardness
Desired Hardness
% Bypass {{Bp()}}
Water Softener Resin Volume
Resin Exchange Capacity
Volume of Water Used
Time for Regenration Cycle {{trCycle()}} day

Lime Soda Softening

Treatment follows removal of Calcium Carbonate (using lime) → Magnesium Carbonate → Calcium non-carbonate (using soda ash)