Environmental Engineering FOURTH EDITION

Reuse, Recycling, and Resource Recovery 293

14.4 If the Bond work index is 400 kWton, what is the power requirement to

14.5 Estimate the heating value of MSW based on the ultimate analysis shown in

14.6 Apower plant bums 100 ton/h of coal. How much air is needed if 50% excess

14.7 An air classifier performance is:

process 100 todh of the refuse described in Fig. 14-16?

Table 12- 1.

air is used?

Organics (kgh) Inorganics (kgh)

Feed 80 20

Product 60 10

Reject 20 10

Calculate the recovery, purity, and efficiency.

saved by reducing the moisture content of refuse to O?

heat in the stack gases (if steam is produced)?

The heating value of a barrel of oil is 6 x lo6 kJ.

14.8 Using the data in Example 14.6, what percent of the heating value can be

14.9 In Example 14.6, what fraction of the coal is "wasted" owing to the loss of

14.10 What is the "wasted" coal in Problem 14.9 heat equivalent in barrels of oil?