The Introduction of Low-Cost Polyethylene Tube Biodigesters on Small-Scale Farms in Vietnam
Bui Xuan An* Thomas R. Preston** Frands Dolberg*** 1997, 1998

Summary
In order to evaluate polyethylene tubular digester development in Vietnam, interviews were carried out in Thuan An district and at two extension centers. Data of design parameters, gas production, economic aspects, farmers' participation, technical problems and methodologies of biogas development were collected. The technology was appealing to the rural people because of its low costs, fast payback, simplicity and positive effect on pollution. The finding pointed to the importance of farmers’ participation for technical feedback, plant maintenance, plant repair and teaching of other farmers. The dissemination of the technology needs the selection of real farmers with high fuel demands as demonstrators, the support of a credit system for the poor farmers and strengthening farmer-extension-scientist relations. Follow-up research should be focused on on-farm studies, particularly the use of the slurry.