Ch. 3

SOUURCES, TYPES, AND COMPOSITION OF MSW

 

3-1 Sources of Solid Wastes

3-2 Types of Solid Wastes

3-3 Compositions of Solid Wastes

3-4 Determination of the Composition of MSW in the Field

3-5 Types of Materials Recovered from MSW

3-6 Future Changes in Waste Composition

 

3-1        Sources of Solid Wastes (table 3-1)

1.        MSW: Residential, Commercial, Institutional, Construction & Demolition, Municipal service, Treatment plant & incinerator

2.        Industrial wastes

3.        Agricultural wastes

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3-2        Types of Solid Wastes

1.       Residential & Commercial

Organics: Garbage, paper & corrugated paper(¥Ë·«¯È), plastics, textiles, rubber, leather, wood, yard wastes

Inorganic: Glass, crockery, tin cans, aluminum, ferrous metals, and dirt.

(Commingled waste²V¦X¼o±óª«)

Garbage ¡V putrescible waste(»G±Ñ©Ê¼o±óª«) ¡V offensive odors, breeding of flies

Influenced the design & operation

Plastics ¡V number code (1 ¡V 7)

1.PETE/ 2.HDPE/ 3.PVC/ 4.LDPE/ 5.PP/ 6.PS/ 7.OTHER

2.       Special wastes

Bulky items (furniture, lamps, bookcase), consumer electronics (radio, stereos, television sets), white goods (stoves, refrigerators, clothes washers & dryers), yard waste, batteries (alkaline, Hg, Ag, Zn, Ni, Cd, lead- acid), oil, tires.

 

3.       Institutional

Government centers, schools, prisons, hospitals (excluding hazardous wastes)

4.       Construction & Demolition (Àç«Ø¼o±óª«)

Dirt, stones, concrete, bricks, plaster, lumber, shingles, plumbing, electrical parts, glass, plastics, RC.

 

5.       Municipal Services

Street sweepings, roadside litter, landscape & tree trimmings, dead animals, abandoned vehicles.

6.       Treatment Plant Wastes

Sludge from water & wastewater treatment plants

Ashes & residuals from incinerators

 

3-3 Compositions of Solid Wastes

l Composition of MSW

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l Distribution of individual waste components (table 3-4, 3-5)

l Effect of waste diversions on distribution of components in MSW

(Table 3-7, example 3-1)

l Variation in percentage distribution of waste components (table 3-8, 3-9)

 

3-4 Determination of the Composition of MSW in the Field

l Residential MSW: quartered (¥|¤Àªk)

l Commercial & industrial MSW: mass balance (½è¶q¥­¿Å)

 

3-5 Types of Materials Recovered from MSW

l Material commonly separated from MSW: Aluminum, paper, plastics, glass, ferrous metals, nonferrous metals, yard waste collected separately, construction & demolition wastes.

l Specifications for recovered materials

 

3-6 Future Changes in Waste Composition

l Impact of waste diversion programs

l Future changes in waste components

 

 

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