An aspect of climate change

An aspect of climate change

Residents of Nutley, Axford, Preston Candover and Wield may be wondering if some elements of Britain’s climate change policy is actually working.

They may be questioning the sudden increase in tractor traffic through the villages this week. A fleet of tractors with tanker trailers have for the last five days each been on a twenty-mile circuit to carry liquid waste from the bio-digester at Dummer to be sprayed as fertilizer over fields between Wield and Bighton.

If this is one of the side effects of climate change policy it is not helping local residents who have been woken at 6.30 am as the first tractors go through and have continued every 15 minutes through the day until the evening.

The farm owner does not have any storage capacity for the liquid manure and the sprayer is being filled directly from the roadside tankers, accounting for the large number of deliveries which would normally be carried out by much larger vehicles

One also has to question the environmental benefit of four tractors burning up a gallon of diesel on every trip and exuding greenhouse gases, apart from the noise and disturbance.

The current programme of deliveries to Wield are expected to be completed by the afternoon of Saturday, 12 February.  But, a new schedule of deliveries will start on Tuesday, 15 April to a destination currently unknown.

The biodigester at Dummer, owned by Biogen (UK) Limited, according to the company, reprocesses 40,000 tonnes each year of food and vegetable waste to produce biogas which is used in the generation of 1.5 megawatts (mw) of electricity a year, enough approximately for 60 houses, according to UK government statistics.

Anaerobic digestion is a sequence of processes by which micro-organisms breakdown biodegradable material and the process is used for industrial or domestic purposes to manage waste or to produce fuels.

Anaerobic digestion is used as part of the process to treat biodegradable waste and sewage sludge and is widely used as a source of  renewable energy. The process produces a biogas consisting of methane, carbon-dioxide and traces of other gases.  This biogas can be used directly as fuel, in combined heat and power gas engines or upgraded to natural gas-quality.  The nutrient-rich digestate produced can be used as fertiliser.

With the re-use of garden and food waste as a resource and new technological approaches that have lowered capital costs, anaerobic digestion has in recent years received increased attention from governments in many countries, including the UK.

See here for a more illustarions - Biodigester

and below for a detailed explanation of the process.





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