Sunday, February 24, 2008

The Weekly Geek at Greenpeace Features Anaerobic Digestion

A Excerpt from the GreenPeace Blog:-

Ken Livingstone wants it for London, Hilary Benn is giving money to it and Adam and Debbie are bringing it to Ambridge. After a couple of millennia in the sidelines, anaerobic digestion has finally hit the big time (well, The Archers, anyway) - which is why we've chosen it for this second edition of the Weekly Geek.

Every year, we bury thousands of tonnes of waste food in landfill sites around the UK. We produce almost one and a half million tonnes of sewage a year (don't do the maths - it's disturbing), which is mostly spread on land, incinerated or buried as landfill. And we produce enormous amounts of agricultural waste on our farms. All of this waste breaks down to release greenhouse gases as it decomposes.

In all, about half of our total landfill comes from biodegradable waste, where it becomes part of the problem that contributes to climate change. Instead of sending it to landfill, anaerobic digestion allows us to convert this waste into ‘biogas', making it part of the solution.

Anaerobic digestion can help us to replace fossil fuels, reduce methane emissions from landfill sites and increase the efficiency of our energy system. As well as helping us to fight climate change, it can solve many of our waste management problems, reduce freshwater pollution from organic wastes, increase fuel security and reduce our dependence on chemical fertilisers.

The following is an animation from EfficienCity outlines showing how it works:

The organic matter used can be pretty much any biodegradable material: food waste from households, markets, shops, restaurants, caterers, breweries, distilleries, industrial kitchens and companies that process food and drink; abattoir waste; agricultural waste like manure, slurry, straw, feathers and crop residues; industrial waste and residues from, say, pharmaceutical processes or paper manufacturing; and sewage sludge.

More here ...

Wednesday, February 06, 2008

Scottish Councils to Trial Food Waste Collection Schemes

We thought that all AD and Biogas fans would be interested in this item as successful food waste collection would be likely to lead to enhanced implemetation of biogas schemes. The following is from Let's Recycle! News:-

The first of Remade Scotland's food waste trials will begin collections on 25 February, after being delayed last year by the change in Scottish government.

Remade Scotland are managing seven food waste collection trials, lasting one year, following in the footsteps of the Waste & Resources Action Programme's food waste trials in England and Wales (see story).

The aim of the trials is to promote better understanding of the effectiveness and economics of different food waste collection systems.

Four of the Scottish trials will focus on collecting food waste only (in Aberdeenshire, East Renfrewshire, Glasgow, Inverclyde) and three of the trials (in Falkirk, North Lanarkshire and Perth and Kinross) will add to existing infrastructure, collecting food waste with the garden waste.

Aberdeenshire: While the majority of the participating councils are due to start trials in March and April, Aberdeenshire will begin its trials in February with 5,000 households in Aberchirder, Banff, Macduff, Whitehills involved in the weekly collections.

All residents will receive a 20 litre bin in addition to a five litre kitchen caddy. Residents will also be provided with a free supply of compostable liners, manufactured by Biobag which come in rolls of six.

The waste will be collected in 7.5 tonne capacity trucks manufactured by Farid and taken to Gray's in-vessel composting facility where it will be composted and used as agricultural fertiliser in the local area.

In preparation for the trials in Aberdeenshire, surveyed 450 households to get an insight into the attitude towards to the forthcoming trials.

David Gunn, assistant campaign manager at Scottish Waste Awareness Group said: "For each of the participating councils, we will do pre-trial and post trial surveys and when all the trials are rolled out we will be collate and analyse the information and submit it to the Scottish Government. We hope to have the report from the pre-trial surveys collaged by the Summer."

All data from the Scottish trials will feed into the data for the UK-wide trials.

Two of the participating local authorities will send their waste to TEG Environmental Plc and four will send their waste to Scottish water's Deerdykes Composting and Organics Recycling Facility - pending award of Pollution Prevention Control Permit being issued by SEPA.