Water management company Aqualia plans to launch a commercial-scale demonstration project using waste water to cultivate algae for biofuel production, which could fuel 400 vehicles, the firm said on Monday.
Spain's Aqualia, owned by construction and services company FCC, in collaboration with European partners, has already started construction of algae culture ponds at a waste water treatment plant in Chiclana, northern Spain, which should be able to produce 500 litres of biodiesel a year and 1,500 cubic meters of biomethane.
The project will cultivate fast-growing micro-algae by using the nutrients in waste water and converting it into biofuels like biodiesel and biomethane which can be used in transport fuel.
If 3,000 kilograms of dry algae a day can be produced with an oil content of 20 percent, the project will be ramped up to commercial-scale size of 10 hectares to produce 200,000 litres of biodiesel a year and 600,000 cubic meters of biomethane – together enough to fuel 400 cars, Aqualia said at a briefing.
"Today we are wasting resources and producing useless sludge. Now we can use it to produce biofuel and have a positive impact," Frank Rogalla, innovation and technology manager at Aqualia, told Reuters.
Micro-algae has benefits over first generation biofuel crops like palm oil, sugar cane and canola, said Rogalla. It can be grown in as little as three days and has needs less land than other biofuel crops.
"Oil productivity can be 10 to 20 times higher than from any known plant," Rogalla said.
More than half the 12 million euro ($15.9 million) project has been funded by the European Commission, which is aiming for 10 percent of energy used in transport in the European Union to be derived from renewable sources by 2020.
Analysts doubt the EU will be able to meet its 2020 targets for cutting transport fuel emissions if it excludes some biodiesel feedstocks which could release as many climate-warming emissions as conventional diesel.
Most biofuels are currently derived from land crops, including sugar cane, maize and vegetable oil, which have been criticized for competing with food production for water and land resources, prompting the search for alternatives.
Some of the alternatives being explored – called second generation biofuels – come from wood, waste, grasses and agricultural residues and from algae.