In: Civil Engineering
Copperas (Fe2SO4.7H2O) will be added to the liquid waste at a
dose rate of 40 kg / 1000 m3 to increase the efficiency of the
sedimentation tank. If it is assumed that wastewater contains
enough alkalinity in the form of Ca (HCO3) 2, calculate:
a. How many kg of limestone in the form of CaO must be added to
complete the reaction! b. The concentration of oxygen needed to
oxidize the formed iron hydroxide! c. Mass of sludge produced per
1000 m3 of wastewater! d. The amount of alum needed to produce
sludge is equal to (c) if it is assumed that the formed precipitate
is Al (OH) 3!