1. A groundwater contains the following constituents: CO2 = 9.6 mg/L Ca2+ = 95.2 mg/L Mg2+ = 25.8 mg/L HCO3 = 198 mg/L as CaCO3 The facility is to treat 50 x 10° L/d of water from this source using lime-soda ash to reduce the hardness. Determine the quicklime and soda ash dosages for softening to stoichiometric limits. Assume the lime is 90% CaO by weight and the soda ash is pure sodium carbonate.

1. A groundwater contains the following constituents: CO2 = 9.6 mg/L Ca2+ = 95.2 mg/L Mg2+ = 25.8 mg/L HCO3 = 198 mg/L as CaCO3 The facility is to treat 50 x 10° L/d of water from this source using lime-soda ash to reduce the hardness. Determine the quicklime and soda ash dosages for softening to stoichiometric limits. Assume the lime is 90% CaO by weight and the soda ash is pure sodium carbonate.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Groundwater Flow

The term groundwater refers to the water which is found beneath the earth's surface. Pores present in the soil and rocks with fractures make a passage for rainwater to enter the earth's surface and deposit as groundwater. The flow nature and direction of groundwater under the earth's surface directly impacts the strength and compressibility of the soil, which reflects its ability to support structural loads.

Question

A groundwater contains the following constituents:
CO2 = 9.6 mg/L
Ca?+ = 95.2 mg/L
1.
Mg?+ = 25.8 mg/L
HCO3 = 198 mg/L as CaCO3
The facility is to treat 50 x 106 L/d of water from this source using lime-soda ash to reduce the hardness. Determine the
quicklime and soda ash dosages for softening to stoichiometric limits. Assume the lime is 90% Cao by weight and the
soda ash is pure sodium carbonate.

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