Diesel fuel made from algae?

Fuel can and is being made from just about anything today. Algae is no exception.

Why are algae preferable over corn? Microalgae has a much faster growth-rate, for one. As part of the photosynthesis process, algae produce oil and can generate 15 times more oil per acre than other plants used for biofuels such as corn and switchgrass. Algae can also grow in salt water, freshwater or even contaminated water, at sea or in ponds, and on land not suitable for food production. This is good news in the sense that we don’t have to waste freshwater to create it.

On top of those advantages in using algae — at least in theory — is that it should grow even better when fed extra carbon dioxide (the main greenhouse gas) and organic material like sewage. If so, algae could produce biofuel while cleaning up other problems.

The difficulties in an efficient biodiesel production from algae lie in finding an algal strain with a high lipid content and fast growth rate that isn't too difficult to harvest, and a cost-effective cultivation system (i.e., type of photobioreactor) that is best suited to that strain.

Another obstacle preventing widespread mass production of algae for biofuel production has been the equipment and structures needed to begin growing algae in large quantities.

Open-pond systems for the most part have been given up for the cultivation of algae with high-oil content. In a closed system (not exposed to open air) there is not the problem of contamination by other organisms blown in by the air. The problem for a closed system is finding a cheap source of sterile carbon dioxide (CO2). Several experimenters have found the CO2 from a smokestack works well for growing algae.

So how will having alternative diesel fuel help our economy? In the United States, oil is primarily used for transportation - roughly two-thirds of all oil use, in fact. So, developing an alternative means of powering our cars, trucks, and buses would go a long way towards weaning us, and the world, off of oil. While the so-called "hydrogen economy" receives a lot of attention in the media, there are several very serious problems with using hydrogen as an automotive fuel. For automobiles, the best alternative at present is clearly biodiesel, a fuel that can be used in existing diesel engines with no changes, and is made from vegetable oils or animal fats rather than petroleum.

One of the biggest advantages of biodiesel compared to many other alternative transportation fuels is that it can be used in existing diesel engines without modification, and can be blended in at any ratio with petroleum diesel. This completely eliminates the "chicken-and-egg" dilemma that other alternatives have, such as hydrogen powered fuel cells.

With biodiesel, since the same engines can run on conventional petroleum diesel, manufacturers can comfortably produce diesel vehicles before biodiesel is available on a wide scale - as some manufacturers already are (the same can be said for flex-fuel vehicles capable of running on ethanol, gasoline, or any blend of the two). As biodiesel production continues to ramp up, it can go into the same fuel distribution infrastructure, just replacing petroleum diesel either wholly (as B100, or 100% biodiesel), or blended in with diesel. Not only does this eliminate the chicken-and-egg problem, making biodiesel a much more feasible alternative than hydrogen, but also eliminates the huge cost of revamping the nationwide fuel distribution infrastructure.

Currently most research into efficient algal-oil production is being done in the private sector, but predictions from small-scale production experiments bear out that using algae to produce biodiesel may be the only viable method by which to produce enough automotive fuel to replace current world diesel usage.

Greg Chapman of Greg Chapman Motors is a knowledgeable and leading provider of used cars, trucks, and SUV’s. Since 1959, Chapman motors has supplied reliable used cars in Austin and the surrounding area and is known as one of the bad credit car dealers in Austin. For more information please visit http://www.gregchapmanmotors.com.

Biofuels and What They Are

You have heard the term biofuel but aren’t sure what it means. Biofuel is any fuel that is derived from biomass-recently living organisms or their metabolic by-products, such as manure from cows. It is considered ‘green’ because it comes from a renewable energy source, unlike other natural resources such as petroleum, coal and nuclear fuels.

Agricultural products specifically grown for use as biofuels include corn and soybeans (primarily in the United States) as well as flaxseed and rapeseed (primarily in Europe).

Waste from industry, agriculture, forestry and households can also be used to produce bioenergy and include straw, lumber, manure, sewage, garbage and food leftovers.

The production of biofuels to replace oil and natural gas is in active development, focusing on the use of cheap organic matter (usually cellulose, agricultural and sewage waste) in the efficient production of liquid and gas biofuels that yield high net energy gain.

There are various current issues with biofuel production and use, which are presently being discussed in the popular media and scientific journals. These include: the "food vs fuel" debate, carbon emissions levels, sustainable biofuel production, deforestation and soil erosion, impact on water resources, human rights issues, poverty reduction potential, biofuel prices, energy balance and efficiency, and centralised versus decentralised production models.

What material can be used to make biofuels? Conventional ethanol is made from sugar cane, corn, and sweet sorghum. Soybean and rapeseed oil are often used to make biodiesel, but coconut, palm, canola and jatropha nut oil are also being used throughout the world.

Trees, grass, agricultural residue, and municipal solid waste can also be converted into biofuels. Cellulose makes up the majority of a plant’s structure and can be broken down into sugars, which can then be fermented and made into ethanol. Recent research is making this process less expensive and more energy efficient.

As the world’s top producer, Brazil uses sugar cane to make ethanol. Many other developing countries, such as those of southern Africa, produce large amounts of sugar and also have potential to become ethanol producers. The Midwestern United States relies on corn to produce nearly one-quarter of the globe’s ethanol, and China is quickly emerging as the third largest ethanol supplier.

Other countries with limited fossil fuel resources are examining the prospect of producing domestic fuel supplies. Thailand has an aggressive policy to make use of tapioca and sugar cane for ethanol production. In response to the recent passage of the EU Biofuels Directive, member countries are ramping up biodiesel production. The Philippines recently mandated incorporation of coconut oil biodiesel into diesel fuel, the first time coconut oil has been used as a motor fuel.

Cars, trucks, and farm machinery can all run on low-volume biofuel blends without any alteration. Current car warranties cover operation with ethanol-blended gas of up to ten percent. Flexible Fuel Vehicles (FFVs) operate on any combination of ethanol and gasoline. FFVs are being sold in the U.S., Brazil, and China. As ethanol has a higher octane, it is used as a gasoline additive to improve vehicle performance. In fact, many international racing teams use ethanol because of its high performance qualities. Biodiesel blends of 20% show similar operation in conventional diesel engines as regular diesel fuel.

Are biofuels the answer for today’s energy crisis? It may be too soon to tell but it certainly has been an alternative source in the meantime.

About the Author: Greg Chapman of Greg Chapman Motors is a knowledgeable and leading provider of used cars, trucks, and SUV’s. Since 1959, Chapman motors has supplied reliable used cars in Austin and the surrounding area. For more information please visit http://www.gregchapmanmotors.com>