Councillor Iorwerth Roberts is unconvinced by the biogas plan

The �4.5m Anglesey Biogas plant, half a mile outside Gwalchmai village, would produce electricity for 600 homes.

Residents have expressed concerns about possible odours from the plant and increased traffic.

The company behind the scheme, Anglesey Biogas, said the latest technology would be used to prevent any odours.

It would use blood and other waste products to create gas to fuel an engine to produce electricity.

The waste material would be sent to the plant in sealed units, and it would be left to rot in special tanks.

Over 100 people from Gwalchmai and Bryngwran attended a meeting on Monday evening called by Gwalchmai community council to discuss the plan.

Both Gwalchmai and Bryngwran councils are opposed to it.

The plant would be built between Gwalchmai and Bryngwran

"This is a strange concept for us, and we feel that we haven't been given enough information about the plant," said Iorwerth Roberts, chairman of Bryngwran Community Council.

"I accept that something needs to be done to get rid of this waste, but why site this sort of thing between two villages and two schools?" Mr Roberts said.

Anglesey Biogas said the plant would use the natural process of "anaerobic digestion" to recycle materials.

Not an incinerator

The company emphasised, however, that the plant was not an incinerator, and that the gas would be produced from primarily liquid materials.

Richard Seaman from Anglesey Biogas said: "We have commissioned an independent expert to look at the matter of odour.

"We have looked at other matters such as noise and traffic and sustainability and the statistics all indicate the site will pose no problem to the local community whether through noise, landscape or traffic."

One woman at the meeting did not agree with his assessment.

"I'm definitely against it," she told BBC Radio Wales. "It's too close to the village.

"With lorries trundling along the A5 on a regular basis, it wouldn't be any good for the road, wouldn't be any good for the community."

According to Anglesey Biogas, the project would employ five people on site with a further 21 jobs created indirectly through increased expenditure in the local economy.

At present there is only one working, large scale, biogas plant in the UK, at Holsworthy in Devon.