… skill, other than those required to build the rest of the simple biogas plant. … years. www.hedon.info/User:CVKrishna www.hedon.info/Creat Figure 3. Biogas plant during construction … 5 2007*-*No*54*-*Boiling*Point* A Polyethylene Dome for Biogas Plants Mr C.V. Krishna, Executive Director, Creat (Centre for Renewable Energy and Appropriate Technologies), 208 Dharma Vihar, Jagamara, Bhubaneswar, India. Telephone +91 0674 23508954, krishnacreat1@rediffmail.co.uk The majority of domestic biogas plants in the world are fixed dome …

What is a PE Dome? The majority of domestic biogas plants in the world are fixed dome models with the dome section often needing skilled labour for construction. The quality of building materials plays a key role in the dome’s gas tightness as any micro hole/crack will allow the gas to escape. In rural India and many other parts of the world the availability of affordable, suitable quality kiln fired bricks and raw materials is low and as a result build quality can suffer. In evaluations of Indian biogas plants it has been found that the failure rate due to cracked/leaking domes is between 30-40%. The PE Dome is a readymade ‘off the shelf’ plastic dome for the top of a domestic biogas plant and designed for use with the Indian Deenbandhu fixed dome type of two cubic metres capacity. The unit can be manufactured at any factory equipped with both plastic rotomoulding technology and a suitable mould, and then shipped to site for simple installation on the top of the digester wall. The dome is made from Polyethylene (PE) with the resins blended to give good material strength, thermal properties etc. To date, three biogas digesters have been built with PE Domes and one defunct plant has been rehabilitated. After evaluating the performance of the four plants the Indian Ministry of New and Renewable Energy has approved it’s dissemination under the National Programme for Biogas Development.

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