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Sewage set to power commercial-scale algae biofuels

 
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Mark



Joined: 13 Dec 2007
Posts: 883
Location: NW England

PostPosted: Thu Mar 15, 2012 2:37 pm    Post subject: Sewage set to power commercial-scale algae biofuels Reply with quote

Sewage set to power commercial-scale algae biofuels:
http://www.edie.net/news/news_story.asp?src=nl&id=22040

An EU-backed €12M algae biofuel demonstration project which aims to produce commercial-scale energy from sewage is set to go ahead in Spain later this year. The All-Gas scheme will cultivate fast-growing algae at wastewater treatment plants by recycling nutrient by-products in the sludge that water companies currently have to clean up and dispose of. To date, much of the work to develop biofuels from algae has been undertaken at a small-scale laboratory level and not proved cost-effective when compared to market fuel prices. All-Gas aims to scale up the technology and demonstrate it on a commercial scale at a 10 hectare site in Chiclana, southern Spain, where an existing wastewater plant is based.

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kenneal - lagger
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Joined: 20 Sep 2006
Posts: 9815
Location: Newbury, Berkshire

PostPosted: Mon Apr 23, 2012 3:31 pm    Post subject: Reply with quote

Sewage sludge is a valuable agricultural fertiliser and contains good levels of phosphorus which will be in short supply in the near future. It should be returned to the land so using it to produce road fuel is a waste.
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adam2
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Joined: 02 Jul 2007
Posts: 6210
Location: North Somerset

PostPosted: Mon Apr 23, 2012 4:11 pm    Post subject: Reply with quote

I suppose that it depends on what happens to the phosphorus in the sewage.
No common road fuel contains phosphorus, so what happens to that contained in the sewage ? If it is returned to the land, all well and good, but if it is dumped, then not a good idea.
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vtsnowedin



Joined: 07 Jan 2011
Posts: 4271
Location: New England ,Chelsea Vermont

PostPosted: Sun Jul 13, 2014 5:38 pm    Post subject: Reply with quote

Cool Some research from this side of the pond. Using cow manure to feed algae . The phosphorous question is addressed in the text.
http://www.burlingtonfreepress.com/story/life/green-mountain/2014/07/13/algae-oil-vermont-fuel-crop/12541139/
Quote:
Good gas?

Next to the silenced methane generator, half-a-dozen chest-high tubes of algae gurgled through his herd’s slurry.

Speaking above the hum of aeration pumps and agitators, Dahiya outlined algae’s virtues:

• The process of harvesting algae-oils is far less disruptive than mining coal, petroleum or natural gas.

• Like fossil fuels, algae-oil releases carbon dioxide into the atmosphere when it is burned. Unlike long-dead fossil fuel sources, living algae sequesters carbon from the atmosphere, its own liquid “feed stock” and even flue-gas.

• A byproduct of algae “reactors” is cleaner water, and a phosphorus and nitrogen fertilizer with a slower (more lake-friendly) release of nutrients than manure.
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