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An air classifier receives a feed of organics and inorganic, and the two are to be separated. A preliminary test is conducted; the results are given in table P5.18. a. If an extract of minimum 85% is required, what is the highest recovery possible? b. Using the Worrell-Stessel efficiency definition, what air velocity yields the highest efficiency?

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Solid Waste Engineering

3rd Edition
Worrell + 1 other
Publisher: Cengage Learning,
ISBN: 9781305635203

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Section
BuyFindarrow_forward

Solid Waste Engineering

3rd Edition
Worrell + 1 other
Publisher: Cengage Learning,
ISBN: 9781305635203
Chapter 5, Problem 5.18P
Textbook Problem
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An air classifier receives a feed of organics and inorganic, and the two are to be separated. A preliminary test is conducted; the results are given in table P5.18.

Chapter 5, Problem 5.18P, An air classifier receives a feed of organics and inorganic, and the two are to be separated. A

a. If an extract of minimum 85% is required, what is the highest recovery possible?
b. Using the Worrell-Stessel efficiency definition, what air velocity yields the highest efficiency?

To determine

(a)

The highest recovery possible.

Explanation of Solution

Given:

The extract of minimum 85% is required.

Concept used:

Write the expression to calculate the recovery of organics.

  Rorg=a1a0×100   ...... (I).

Here, the recovery of organics is Rorg , the organic extract is a1 and the organic in feed is a0 .

Write the expression to calculate the recovery of inorganic.

  Rinorg=b1b0×100   ...... (II).

Here, the recovery of inorganic is Rinorg , the inorganic extract is b1 and the inorganic in feed is b0 .

Calculation:

Calculate the recovery of organic and inorganic.

    Organic in the feed(lb/h)(a0) Inorganic in the feed(lb/h)(b0) Air velocity(ft/sec) Organic in extract(lb/h)(a1) Inorganic in extract(lb/h)

      (b1)

    Recovery of organic(%) Recovery of inorganic(%)
    18 20 20 5 0
To determine

(b)

The air velocity that yields the highest efficiency.

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