Option 17Smallscale digestion and biogas recovery

Small-scale digesters are found in temperate and tropical regions to enhance the anaerobic decomposition of the manure and to maximize CH4 production and recovery. In OECD countries they are not used. Fermented manure is a high-quality fertilizer and an important product in resource-constrained regions. A reduction of 10 per cent of manure-related CH4 emissions is expected in these regions, if introduced widely in India, China, East Asia and Latin America. Costs are ~$500 per tonne of avoided CH4 emission for small-scale digesters. Benefits are the waste reduction and small-scale energy production for households and farms. A more detailed cost estimate of these options is given in Table 13.3.

Table 13.3 Costs of measures to reduce CH4 emissions from animal manure in

Europe in $/t CH4

Measure

Cool climate

Temperate climate

Table 13.3 Costs of measures to reduce CH4 emissions from animal manure in

Europe in $/t CH4

Measure

Cool climate

Temperate climate

Pigs

Dairy

Beef

Pigs

Dairy

Beef

Daily spreading

2264

4124

5505

645

1183

1579

Large-scale digestion, UK

450

828

1106

75

138

184

Large-scale digestion, Denmark

2287

4211

7878

500

921

1723

Small scale, Germany (heat and power)

286

526

703

48

88

117

Small scale, Germany (heat only)

95

175

234

16

29

39

Italy (CHP)

181

334

446

30

56

Source: AEAT(1998)

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