Page 3 - mobile Workbook-chapter 2

2.1 Categories of characteristics

There are five major groups:

▪ Composition
▪ Physical properties

▪ Chemical properties

▪ Energy content
▪ Biological properties

Fig 2.1: Framework of characteristics

2.2 Composition

Composition is defined that the term used to describe the individual components that make up
a solid waste stream and their relative distribution, usually based on percent by weight (%) [1].

Additionally, composition of SW is called items that can be identifiable [6]. This process is done

based on shape, colour or material of waste which can be detected by human’s senses.

Components can be divided into two groups: recyclable & not recyclable (landfill waste); or
organic & inorganic. Based on that, sort identifiable items.

Fig 2.2: Classification of physical components in waste mixtrure

Aim to determine physical components, you need to answear two questions: (1) what’s in your
garbage? and (2) what percent of weight can components in waste mixture account for?

Fig 2.3: Two aims for determining composition

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