Environmental Engineering: Water Softening A lime soda softening plant treats a flow of 150 MGD, and the water has a hardness of 225 mg/L as CaCO3, an alkalinity of 178 mg/L as CaCO3, a Mg 2+ ion content of 39 mg/L, and 4 mg/L CO2. The commercial grade of quicklime has a purity of 85% and the soda ash has a purity of 95%. Use excess lime of 1.25 meq/L. Determine: Compute the volume of sludge produced per millions gallons of water treated. Assume the sludge contains 10% solids and 90% water

Environmental Engineering: Water Softening A lime soda softening plant treats a flow of 150 MGD, and the water has a hardness of 225 mg/L as CaCO3, an alkalinity of 178 mg/L as CaCO3, a Mg 2+ ion content of 39 mg/L, and 4 mg/L CO2. The commercial grade of quicklime has a purity of 85% and the soda ash has a purity of 95%. Use excess lime of 1.25 meq/L. Determine: Compute the volume of sludge produced per millions gallons of water treated. Assume the sludge contains 10% solids and 90% water

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter18: Bituminous Materials

Section: Chapter Questions

Problem 4P

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Question

Environmental Engineering: Water Softening

A lime soda softening plant treats a flow of 150 MGD, and the water has a hardness of 225 mg/L as CaCO₃, an alkalinity of 178 mg/L as CaCO₃, a Mg ²⁺ ion content of 39 mg/L, and 4 mg/L CO₂. The commercial grade of quicklime has a purity of 85% and the soda ash has a purity of 95%. Use excess lime of 1.25 meq/L.

Determine:

Compute the volume of sludge produced per millions gallons of water treated. Assume the sludge contains 10% solids and 90% water

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