Water defined by the following analysis is to be softened by excess lime treatment in a two- stage system: HCO; = 150 mg/L as CaCOs so = 120 mg/L Cl=71 mg/L CO2 = 4.5 mg/L Ca+ = 64 mg/L Mg = 37 mg/L Na* = 29 mg/L The plant is to treats a flowrate of 20,000 m/day. The practical limits of removal can be assumed to be 30 mg/L of CaCO3 and 10 mg/L of Mg(OH)2 expressed as CACO3. Assume excess lime of 35 mg/L CaO. Find the following:
Water defined by the following analysis is to be softened by excess lime treatment in a two- stage system: HCO; = 150 mg/L as CaCOs so = 120 mg/L Cl=71 mg/L CO2 = 4.5 mg/L Ca+ = 64 mg/L Mg = 37 mg/L Na* = 29 mg/L The plant is to treats a flowrate of 20,000 m/day. The practical limits of removal can be assumed to be 30 mg/L of CaCO3 and 10 mg/L of Mg(OH)2 expressed as CACO3. Assume excess lime of 35 mg/L CaO. Find the following:
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![Water defined by the following analysis is to be softened by excess lime treatment in a two-
stage system:
HCO; = 150 mg/L as CaCO;
so = 120 mg/L
Cl= 71 mg/L
CO2 = 4.5 mg/L
Ca2+ = 64 mg/L
Mg²* = 37 mg/L
Na = 29 mg/L
The plant is to treats a flowrate of 20,000 m³/day. The practical limits of removal can be
assumed to be 30 mg/L of CaCO3 and 10 mg/L of Mg(OH)2 expressed as CaCO3. Assume
excess lime of 35 mg/L CaO. Find the following:
a) Sketch the meq/L bar graph.
b) Calculate the quantity of softening chemicals required in kg/day
c) Calculate the sludge quantity produced in kg/day.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd90eacd4-dfd4-4a80-bcd7-4bb3aa025a2b%2Fb0a77332-a6ce-476f-9609-d5907150b2de%2F04r19aq_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Water defined by the following analysis is to be softened by excess lime treatment in a two-
stage system:
HCO; = 150 mg/L as CaCO;
so = 120 mg/L
Cl= 71 mg/L
CO2 = 4.5 mg/L
Ca2+ = 64 mg/L
Mg²* = 37 mg/L
Na = 29 mg/L
The plant is to treats a flowrate of 20,000 m³/day. The practical limits of removal can be
assumed to be 30 mg/L of CaCO3 and 10 mg/L of Mg(OH)2 expressed as CaCO3. Assume
excess lime of 35 mg/L CaO. Find the following:
a) Sketch the meq/L bar graph.
b) Calculate the quantity of softening chemicals required in kg/day
c) Calculate the sludge quantity produced in kg/day.
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