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Sustainable Industrial Design and Waste Management
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• Reducing the costs involved in the disposal of waste, which ultimately
leads to savings for the community.
• Providing employment.
• Protecting natural resources.
• Reducing pollution.

6.2 Reject Technologies
The rejects recycling system (El-Haggar, 2004c) as shown in Figure 6.1 con-
sists of a screen separator to separate the rejects from the organic waste. The
screened rejects will be agglomerated to cut the plastic into small pieces. After
the rejects have been agglomerated, they are mixed with sand and plastic addi-
tives to adjust the properties and appearance and heated indirectly to 140–
240°C depending on the mixture and required applications. The hot paste is

Rejects

Organic Screen
wastes separator Sand

Plastic bags Sand
and other screen
impurities

Mixing and
Agglomerator heating

Paste
Mold

Hydraulic
press

Products

FIGURE 6.1 Schematic diagram of silica-plast “rejects” products