Question

The town of Cleanland (population 225,000) produces solid waste at the rate of 5lb/capita/day (see waste composition below). The town officials are considering the construction of a material recovery facility (see schematic below) to handle all the solid waste except the yard wastes (collected /managed separately). To aid in the cost estimate, calculate the amounts (1lb/day) of aluminum and ferrous metals recovered. Assume the separation efficiencies given below apply. Show all work.

Waste Type                                              %wt. composition

Yard                                                                   15

Paper                                                                 30

Plastic                                                                 10

Glass                                                                    13

Ferrous metals                                                   8

Aluminum                                                            2

Other                                                                   22

                                               Air Classifier                                 Magnetic Separator MS

Waste Type                       % toCycl        % to MS                    % Ferrous       % to RSS

Yard waste                                -                  -                                   -                        -

Paper                                       95                  5                                  1                       99

Plastics                                     78                 22                                  1                       99

Glass                                            1                 99                                  0                       100

Ferrous Metals                          0                 100                               99                         1

Aluminum                                 1                      99                                0                      100

Other                                          40                   60                              1                           99

                                              Rotating Screen RSS                                  Aluminum Separator AS

Waste Type                        % to class             % to AS                       % to Alum               to resid

Yard Wastes                               -                           -                                      -                              -

Paper                                           65                       35                                     2                           98

Plastics                                         45                       55                                     1                           99

Glass                                              98                      2                                        2                            98

Ferrous Metals                            30                       70                                    4                            96

Aluminum                                       1                          99                                  99                           1

Other                                               55                        45                                   3                           97

                             

Answer 1