http://www.theecologist.org/blogs_and_comments/Blogs/2604807/seaweed_problem_could_provide_biofuel_solution.html
Seaweed problem could provide biofuel solution
Paul Brown
14th March 2015
Biofuels are controversial because they are often produced from food
crops or grown on farmland, writes Paul Brown, creating extra pressure
on land and forests. But a common algae found in abundance around
coastlines and clogging up beaches may be the answer.
Seaweed problem could provide biofuel solution
Paul Brown
14th March 2015
Biofuels are controversial because they are often produced from food
crops or grown on farmland, writes Paul Brown, creating extra pressure
on land and forests. But a common algae found in abundance around
coastlines and clogging up beaches may be the answer.
What we are trying to do is to mimic natural processes to produce oil.
However, while petroleum oil is produced naturally on a geologic
timescale, we can do it in minutes.
It has often been used as a farmland fertilizer, and in some communities
it is eaten as a vegetable, but now researchers believe that seaweed
could power our cars and heat our homes too.
One species of algae in particular, sugar kelp (Laminaria saccharina),
is exciting scientists from Norway. It grows prolifically along the
country's coasts and, as its name suggests, contains a lot of energy -
about three times as much sugar as sugar beet. That makes it suitable
for turning into food and fuel.
Sugar kelp uses excess nitrogen in the sea, and so cleans up fertilizer
pollution. However, it can grow so fast it can be clog beaches and needs
to be removed, so finding an economic use for it would solve many problems.
Scientists are competing to see who can get convert seaweed into fuel
most efficiently.
One of them is Fredrik Gröndahl, a KTH Royal Institute of Technology
researcher and head of the Seafarm project. He believes the algae are
being upgraded from an environmental problem into a valuable natural
resource and raw material.
"The fact is that algae can absorb nitrogen from the water as
effectively as a wastewater treatment plant", Gröndahl says,
An eco-friendly resource
In some places, it is so prolific that it disrupts normal activities
along the shoreline, but Trandahl's project converts algae into
eco-friendly food, medicine, plastic and energy. "We see algae as a
resource", he says. "We collect excess algae along the coasts, and we
cultivate new algae out at sea."
The seaweed is being scooped up from the Baltic Sea, along Sweden's
southern coast, in order to be converted to biogas. It is a coast rich
with the seaweed, and the city of Trelleborg estimates that its beaches
host an excess of algae that is equivalent to the energy from 2.8
million litres of diesel fuel.
The first algae farm is already up and running, near the Swedish town of
Strömstad, in the waters that separate the country from Denmark. The
Seafarm project will, according to Gröndahl, contribute to the
sustainable development of rural districts in Sweden. "We create
all-year-round jobs", he says.
One example is in the 'sporophyte factory farms' on land where, to begin
with, the algae are sown onto ropes. When miniature plants (sporophytes)
have been formed, they sink and are able to grow in the sea. After about
six months, when they algae have grown on the ropes, they are harvested
and processed on land through bio-refining processes.
Fast growing seaweed to 'bio-crude'
"It will be an energy forest at sea", Gröndahl says. "We plan to build
large farms on two hectares right from the start, since the interest in
the activities will grow rapidly when more farmers and entrepreneurs
wake up to the opportunities and come into the picture.
"In 15 years' time, we will have many large algae cultivations along our
coasts, and Seafarm will have contributed to the creation of a new
industry from which people can make a living."
Another line of research, using the same kind of seaweed, has been
revealed by Khanh-Quang Tran, an associate professor in the Norwegian
University of Science and Technology (NTNU) Department of Energy and
Process Engineering. He has been producing what he calls bio-crude.
"What we are trying to do is to mimic natural processes to produce oil",
says Khanh-Quang Tran, whose results have been published in the academic
journal, Algal Research. "However, while petroleum oil is produced
naturally on a geologic timescale, we can do it in minutes."
Using small quartz tube 'reactors' - which look like tiny sealed straws
- Tran heated the reactor, containing a slurry made from the kelp
biomass and water, to 350˚C at a very high rate of 585˚C per minute.
The technique, called fast hydrothermal liquefaction, gave him a bio-oil
yield of 79%. That means that 79% of the kelp biomass in the reactors
was converted to bio-oil.
A similar study in the UK, using the same species of kelp, yielded only
19%. The secret of much higher yields, Tran says, is the rapid heating.
But now, will it work at industrial scale?
Biofuels that use seaweed could lead humans towards a more sustainable
and climate-friendly lifestyle. The logic is simple: petroleum-like
fuels made from crops or substances take up CO2 as they grow and release
that same CO2 when they are burned, so they are essentially carbon-neutral.
The problem of using food crops has led many to question whether
bio-fuels are a solution to climate change. So to get around this
problem, biofuel is now produced from non-food biomass, including
agricultural residues, and land-based energy crops such as fast-growing
trees and grasses.
However, seaweed offers all of the advantages of a biofuel feedstock,
and has the additional benefit of not interfering with food production.
But while Tran's experiments look promising, they are what are called
screening tests. His batch reactors are small and not suitable for an
industrial scale.
Scaling up the process requires working with a flow reactor, one with a
continuous flow of reactants and products. "I already have a very good
idea for such a reactor", he says.
Tran is optimistic that he can improve on a yield of 79%, and is now
looking for industrial partners and additional funding to continue his
research.
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