Treatment Methods On Physical And Chemical Characteristics Of Waste

1598 Words Jan 18th, 2016 7 Pages
Treatment methods:

Suitability of various treatment methods depends on physical and chemical characteristics of waste (Fig.1). The method of treatment is decided based on moisture content, organic matter and total solids.

Biological Properties of MSW

Excluding plastic, rubber, and leather components, the organic fraction of most MSW can be classified as follows:

1. Water-soluble constituents, such as sugars, starches, amino acids, and various organic acids.
2. Hemicellulose, a condensation product of five- and six-carbon sugars,
3. Cellulose, a condensation product of the six-carbon sugar glucose
4. Fats, oils, and waxes which are esters of alcohols and long-chain fatty acids,
5. Lingnin, a polymeric material containing aromatic rings with methoxyl groups (-OCH3), the exact chemical nature of which is still not known (present in some paper products such as newsprint and fibreboard),
6. Lignocellulose, a combination of lignin and cellulose,
7. Proteins, which are composed of chains of aminoacids.

Perhaps the most important biological characteristic of the organic fraction of MSW is that almost all of the organic components can be converted biologically to gases and relatively inert organic and inorganic solids. The production of odours and the generation of flies are also related to the putrescible nature of the organic materials found in MSW (e.g., food wastes).

Biodegradability of Organic Waste Components

Volatile solids (VS) content, determined by ignition at…
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