Blooming Biofuel: How Algae Could Provide the Solution
The distant sparkle of algae is coming into focus. Interest is growing exponentially and a handful of companies are planning the leap from research to commercial production of algae-based fuels.
Jun 22, 2009 - Jeffrey Decker - RenewableEnergyWorld.com
In the years since the discovery of significant concentrations of lipids in certain species of algae, estimates for the potential of the single-cell water-borne plant have varied wildly. What is agreed is the substantial potential for algae to become a valuable resource in the portfolio of second generation biofuels. The tiny plants can produce at least 15 times more oil per hectare than alternatives like jatropha, rapeseed and palm, and are 20 times as productive as corn and soy. Today, high-end food supplements are still the main algal product, but some estimate their fuels could compete with petroleum at US$60 per barrel.
Excitement, and sometimes hype, are keywords here. ‘I’ve seen calculations that Arizona could provide 40 to 60 billon US gallons (182 to 272 billion litres) of road fuels, biodiesel and ethanol, from algae, just utilizing its open space,’ explains Tom Byrne, secretary of the Algal Biomass Association and CEO of Byrne & Company Ltd, saying: ‘I don’t really see where algae are going to compete head-to-head with corn or soybeans or any of the feedstocks. That’s the excitement of it, because it doesn’t do that. Algae will play a leading role because it uses wastewater and CO2, and releases oxygen and clean water.’
The environmental advantages of algae – which absorb CO2 along with nitrates and phosphates – are coupled with the promise of commercial yields of high quality biofuel.
An indication of this potential is given by the growth of interest in the sector. According to Otto Pulz and his colleagues at the IGV Institute in Potsdam, Germany, the 100,000 known strains of microalgae in the world are currently being scrutinized by at least 200 companies with big plans. At first count, in 2007, there were just five. ‘Mainly in the U.S., it’s concentrated there,’ he says, with European interest next.
Nonetheless, despite the downturn, investors continue to emerge. ‘In the U.S.,’ says Byrne, ‘I know of about one half billion dollars that have been invested. I’ve heard claims of over a billion. Most of it’s been what we call angel investors.’
Bill Gates and his Cascade Investment LLC jumped behind Sapphire Energy of San Diego, helping them raise ‘substantially more than $100 million’ by September, along with ARCH Venture Partners, Wellcome Trust and Venrock. Sapphire means to produce 10,000 barrels of ‘green crude’ in three to five years.
Solazyme of San Francisco isn’t saying who invested $45 million in their fermentation process to grow algae in the dark. Their target to sell diesel is between next year and 2012, although testing by the global standards-setting body ASTM International has already cleared their diesel for performance and safety.
Being proven helps attract investments, says Adeo Ressi, founding member of Thefunded.com. ‘If you have a company that’s already financed, the likelihood of it being able to receive more money is significantly higher than a new entrant’, he says. ‘Outside of inventing cold fusion, it’s going to be very, very difficult, if not impossible, for new companies to find financing.’ He notes: ‘One nice thing about algae compared to solar and some other clean tech ideas, is that by comparison it can be much more capital efficient.’
Nonetheless, some government-backed programmes have failed to live up to expectations. For instance, the Japanese government’s Research for Innovative Technology of the Earth programme spent $100 million studying closed algae systems, but ultimately gave up on it. While in 1996 the United States closed its US Aquatic Species Program, which led research over three decades at two 1000 m² open-pond systems, before concluding the technology was too expensive for large-scale production.
Technologies and Modifications
So-called open systems stand exposed to the elements and nurture algae favourable to the local environment. There’s a lot caretakers can do to stimulate growth in these low-cost simple systems, but not as much as is possible in the more expensive closed systems. These can cover just as many hectares, but are sealed in plastic, glass or bags and offer extensive control options. Numerous innovative designs aim to mimic the low costs of open-ponds with the efficiency and enhanced production of closed systems.
Those bioreactors can be arranged vertically to maximize collection of sunlight, and also allow manipulation of pressure and temperature to stress the algae into producing more oil than they normally would. Some employ centrifuges or chemical additives, and many more tricks have been tested.
Bioreactors are preferred for colder climates, and also allow specific control over the carbon dioxide gas feed. The cleaner the carbon, the ‘happier’ the algae, and the exact makeup of the carbon source can lead to the appropriate selection of algae for the best production. A harvest of 300–400 ppm is considered healthy. That string of energy then has to be turned into something denser that’s biologically stable and won’t break down. Dehydrating the harvest is one of the many challenges researchers are working to overcome.
Another approach to improve yields is selective genetic engineering. While some open pond processes accept the algae that appears and grows naturally, most companies carefully select the species with the most desirable traits. Some others attempt to make their own. ‘We are not manipulating the genome,’ says Dominique Duvauchelle, CEO of Eco-Solution, ‘When bacteria lives, it divides in two. And sometimes when this happens you can select the mutations,’ he explains, revealing by way of illustration that some of the species with the highest concentrations of lipids have very hard cellular walls, which hinder efforts to extract the oil. It is therefore desirable to select particular mutations with high lipid content and weaker cell walls for future generations. ‘If you have a continuous culture you can add some new mutations at any time,’ Duvauchelle adds.
Their ‘high throughput platform’ accelerates those divisions and the production of variants. Located outside Paris, his company was founded in 1999 and has raised €9.5 million from private investors. Their discoveries, like some others in this sector, have gone to aid treatment of industrial and municipal wastewater as well as soil decontamination. Indeed, connecting algae production to industry is a common plan, with benefits for both sectors. The algae need a steady stream of CO2 and their absorption of this gas could help to minimize the environmental impact of greenhouse gas emissions.
An example comes from Seambiotic Ltd of Israel, which is reputed to be the first algae cultivation operation using flue gas from coal-fired power plants.
After their pilot plant went online in 2005, says chief advisor Ami Ben-Amotz, the power plant officials were not too happy. ‘Now we are in co-operation. They want to change the front gate so visitors will go into the power plant through the ponds of the algae!’ That will accompany expansion from today’s 1000 m² to a five hectare production plant by late 2009.
Ben-Amotz advises, ‘To get connected to the chimney is quite difficult,’ but with seven tonnes of algal health food as their main product, picking the algae is easy. ‘My way is not to find the algae, but to let the algae come by themselves. If you give the algae the best conditions they will come. They’re in the water. What they call self-selection. Then you just enrich the algae.’ Nonetheless, now that jet fuel production is a new goal, analyzing strains is a new chore for Seambiotic scientists.
Commercializing and Scaling
Better algae strains will emerge, predicts Brian Willson of Solix Biofuels, but more will be needed if algae-derived biofuels are to achieve their potential. They still need ‘to enhance growth rates, to reduce the cost of oil extraction and reduce the cost of nutrients,’ he explains. Eventually, he says, ‘We can be competitive, we believe, with $60–$80 per barrel.’ This compares with today’s prices, where ‘it’s thousands of dollars per gallon because it’s being produced in research quantities.’
Within three to five years Solix means to begin large-scale production on a 10-acre (4-hectare) site on the Southern Ute Indian Reservation in Southwest Colorado. Their bioreactors will stretch skyward to maximize sunlight exposure, paid for by $10.5 million from its first round of outside funding. The Ute tribe is an equity holder in the company.
Solix isn’t worried with converting their algae oil into fuel. Refineries can buy the oil and re-sell it themselves. ‘It’s essentially a triglyceride, so it’s the same category of compounds we get from soy, canola, palm, jatropha, you name it’, Willson says.
Michael Kroeger of the non-profit German Biomass Research Centre notes: ‘The most advanced technical problem is how to handle the water. Algae only have a very low concentration in the growth medium (0.5 g/l up to maximum 3.0 g/l, depending on the reactor). This makes the harvest and the post-processing very energy-intensive.’
HR Biopetroleum has had almost twenty years to puzzle over these problems, which may be one reason Royal Dutch Shell partnered with it to form Cellana and build massive algae ponds in Hawaii. They are a contender to be the largest biofuel producer when their commercial plant starts operating next year and if their plans for a 20,000 hectare plant hold true for 2012.
Meanwhile, GreenFuel Technologies Corp. seems on a steady course with Aurantia Group to build a 1000 m² algae facility outside a cement plant in Jerez, Spain. They intend to produce around 25,000 tonnes of algae biomass annually from a $92 million facility. The Cambridge, Massachusetts-based company specializes in capturing numerous industrial emissions in algae facilities.
The exception to this young sector’s restraints of time and technology is Alganol Biofuels, which says it is ready this year to sell algae-based ethanol at affordable prices. The Maryland-based company licensed its technology last year to BioFields of Mexico, which invested $850 million last June to build a massive algae farm in Northwest Mexico. Biofields could start producing 378 million litres of ethanol a year, and intends to increase this to 1 billion gallons (3.8 billion litres) per year by 2012. Furthermore, the process avoids the requirement for dewatering, crushing or processing the algae.
The process working both in Mexico and at Alganol’s Florida site was invented by CEO Paul Woods in the 1980s. ‘We don’t make any oil. We specifically look for algae that have very high photosynthetic rates and low oil production. We want to channel carbon into ethanol’ explains Woods. ‘We specifically don’t want to channel carbon into lipids, fatty acids or oils.’
In Florida, Woods is waiting on permits to extract seawater before building a 1000 or 10,000 acre (400–4000 ha) facility. He’s already ordered the ‘soda bottle’-shaped grow chambers. ‘They’re roughly five feet (1.7 metres) wide and we ordered around six and a half miles (10 kilometres),’ he asserts. ‘It’s probably bigger than any other facility in the world. It all comes down to design. We don’t have to harvest our organisms. We don’t crush them, kill them or dewater them. Ethanol is an evaporative. It evaporates out of the space all on its own.’
Competition Driving Innovation
Although interest in algae-derived biofuels is clearly increasing and the sector is attracting significant investment in production expansion and technology R&D, Dave Jones of LiveFuels doesn’t yet foresee fierce competition in this emerging field. ‘I don’t think it’s a winner-take-all game. This is the commodity business. To the extent that we’re all making something to burn, the demand for flammable liquids is much greater than what the algae industry can produce for at least the next couple of decades.’
That observation is apparent in their plan to provide algae oil to fuel refiners. One focus at LiveFuels, Jones says, is algae growing in conjunction with different kinds of microbes and in conjunction with higher level life forms like fish. ‘We think those systems are going to be a lot more robust and a lot less likely to crash than systems that are going to be based on just one set of algae. Healthy competition will help everyone,’ he says, ‘there ought to be plenty of opportunities for companies to play together as they optimize the process.’
In the meantime, production costs are becoming more competitive with fossil-derived alternatives. For instance, the Netherlands’ Algae Link CEO, Peter van den Dorpel, says: ‘We could offer the full chain of algae-to-fuel and be competitive with the fossil fuel market at the level of $100/barrel. Our algae-growing systems today are showing these productivity levels and we are scaling-up production capacity.’ Their demonstration units are small enough to ship and can be scaled upward, he says, mostly to customers planning to grow high-end diet supplements. ‘Sometimes the CO2 issue is the main driver. They don’t even care where the end product goes,’ van den Dorpel adds, noting: ‘We’ve sold more than 30 units in about 20 countries.’
Among the oldest players is Ingrepro Micro Ingredients, and director C. Callenbach says they’re competitive today. ‘If oil doesn’t go below $42/barrel, then it gets into the break-even,’ he asserts. This year the company is building four ‘energy farms’ – a combination of wastewater treatment and algae plant. ‘You produce biomethane and at the same time you produce biomass,’ he says, adding: ‘On 30 hectares the low cost we can achieve is 70–80 tonnes per hectare.’
Ingrepro holds claim to being the largest industrial algae producer in Europe, but they don’t stress themselves on breaking new scientific frontiers. ‘It’s not the system that does it. It’s a combination of the systems and you have to have good management,’ Callenbach says. ‘There are companies focused on convincing people to use their system. We use any system. We are not married to anybody.’
Even so, Callenbach worries the hype promoted by algal newcomers is hurting the overall industry. ‘Some are honestly over-optimistic and some aren’t,’ he remarks, saying: ‘There are a lot of companies that fooled a lot of people.’
As Ingrepro moves outside of food production they’re looking past automobiles and straight into kerosene for jet aircraft. So far, ‘Whatever kerosene we make is very easy to sell, because everybody wants it. It’s a niche market. In the next two years we will be able to lower the cost of our kerosene more.’
Though several airlines are still testing innovative alternative fuels in their commercial jet liners, Morgan says Boeing has concluded that phase of its own research. He has already watched the available fuel selection rapidly grow from almost nothing, and notes: ‘The great thing is that the innovation is happening in a wide spectrum of places, from two people in a garage with a great idea, all the way to major research and development places in the government sector.’
As an emerging technology with a huge potential and an even bigger demand it is perhaps inevitable that some players are tempted to hype claims for yields as they search the markets for development finance. Some claims will inevitably turn to dust as the real commercial winners emerge and some are revealed as dead ends. But with the range of technologies available and a ground swell of R&D investment cash, confidence among developers is high that algae-derived biofuels will soon be able to compete with fossil fuels.
Jeff Decker is a freelance journalist covering energy and aviation and living in Oshkosh, Wisconsin.