Solid Waste Engineering
Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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Chapter 7, Problem 7.5P
To determine

(a)

The flow diagram of unit operations for product RDF-1 .

To determine

(b)

The flow diagram of unit operations for product RDF-2 .

To determine

(c)

The flow diagram of unit operations for product RDF-3 .

To determine

(d)

The flow diagram of unit operations for product RDF-4 .

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Using copperas as a coagulant, 30 g/m³ was added to the water. (a) Calculate the minimum natural alkalinity (in terms of CaCO3) required to react with the ferrous sulphate. (b) How much lime of 70% available CaO is required to convert the initial reaction product to Fe(OH)₂? (c) What concentration of dissolved O₂ is required to convert the Fe(OH)₂ to the ferric form?
You are being consulted for the design of a coagulation-flocculation basin for a water treatment plant. Ferric sulfate is available as a commercial coagulant and is popular at removing turbidity and color. The chemical reaction for its addition to water is: Fe2(SO4)3 + 3Ca(HCO3)2 ----> 2Fe(OH)3 (s) + 3CaSO4 + 6CO2Results of a jar test to determine the optimal coagulant dose are provided below. The initial water sample has a pH=6.5 and turbidity of 30 NTU. Ferric sulfate dose, mg/L: 5 10 15 20 25Turbudity, NTU: 15 5 1 0.9 2What is the optimal mass of ferric sulfate you would need to purchase every day to treat 106 gallons/day to a turbidity below 1 NTU (assume 100% purity of the coagulant).
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