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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l ¨Æ·~¼o±óª«¡G
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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
¥i¿Uª«¡G¯ÈÃþ¡BÅÖºû¥¬Ãþ¡B¤ì¦Ë½_¯ó¸¨¸Ãþ¡B¼p¾lÃþ¡B¶ì½¦Ãþ¡B¥Ö²¾ó½¦Ãþ¡B¨ä¥L¡C(¦@¤CÃþ)
¤£¿Uª«¡Gª÷ÄÝÃþ¡B¬Á¼þÃþ¡B³³²¡Ãþ¡B¥ÛÀY¤Î5 mm¥H¤W¤g¬â¡C(¦@¥|Ãþ)
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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