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Page 1Group No.7

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Compost is organic matter that has been decomposed

and recycled as a fertilizer and soil amendment.

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There are developed quality standards.

Government

Private composting association

For a example Canada has developed 3standards

A national Canadian standard for the composting

industry (BNQ);

Guidelines for compost (CCME); and

The adoption of new mandatory criteria for compost

(AAFC).

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Qualitycompost

Well maturity

No foreign matter

High amount

of trace

elements

No pathogenic

organisms

No organic

contaminants

Contain humic substances

Good physical

charactersGood chemical

characters

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Technically, compost may be made fromany organic material. Green Manures- legumes

Animal Manures

Kitchen waste Garden residues

farm residues-hay ,straw

Paper & cardboard

MSW

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Manipulate,

Material size and shape

Contamination from toxic

Proportions of the row materials

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The best sized is less than 2 inches in thelargest dimension.

Shredding or grinding raw materials

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Farm waste heavy mettle, herbicide News paper Pb

Animal manure pathogens, anti biotic

House Trash

MSW compost

Bio Compost 14

Green CompostGarden Compost

How waste handling

affects compost quality:

Dioxin concentration

(ng/kg) in waste and

composts.

Source: Kraus & Grammel

1992

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Sorting out is important

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Different raw matter effect differently.

Saw dust Carbon / Humic substances.

Chicken manure Nitrogen

Dry leaf litter Reduce moisture content

Simple sugar Initial microbial population

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Balance is important

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1. Compost quality standards & guidelines- project report by

William F. Brinton, Ph.D.(Project Manager)

2. http://whatcom.wsu.edu/ag/compost/fundamentals/needs_parti

cle_size.htm

3. Support Document for Compost Quality Criteria-National

Standard of Canada

4. http://cwmi.css.cornell.edu/composting.htm

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08/AG/009-- S.J. Karunanayake

08/AG/026-- W. M. B. P. B. Weerasinghe

08/AG/039-- P.G.S.P Chandrasiri 08/AG/057-- K. A. N. Y. Kodisinghe

08/AG/068-- H.A.D.G. Perera

08/AG/079-- W.A.S.D. Wickramasinghe 08/AG/089-- R. Cyril

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