Istraživaći u Nevadi su izvijestili da otpadno tlo kave može omogućiti jeftin, obilan i okolišno prijateljski izvor biodizel goriva

za rad auti i kamiona. Glavna barijera širem korištenju biodizela je nedostatak jeftinije cijene i visoko kvalitetnog izvora za njegovu proizvodnju.

Tlo kave sadrži između 11 i 20 posto ulja po težini. To je od prilike isto kao tradicionalna biodizel ulja od palme i soje.

Proizvođači proizvode više od 16 milijuna funta kave (1 funta = 453 grama) svake godine.

Korištena ili potrošena tla korištena za proizvodnju espressa, capuccina često završe kao smeće ili kao conditioneri za kosu.

Znanstvenici su procijenili da bi potrošnja kavinog tla , mogla dodati 340 milijuna galona biodizela.

"Kava gorivo" bi imalo veliku prednost veće stabilnosti od tradicionalnog biodizela , zbog kavinog antioksidans sadržaja.

Znanstvenici su procijenili da bi ovaj proces mogao napraviti profit veći od 8 milijuna dolara i to samo u US. 

Biodizel ima sve rašireniju proizvodnju. Ulje se može raditi iz soje, palme, kikirikija i drugih biljnih ulja, životinjske masnoće, pa čak i 

recikliranog ulja za kuhanje.

Biodizel također može biti dodan kao uobičajeno dizel gorivo. Može biti zaseban, ili kao alternativa dizel uljima.  

Skraćene vijesti s Science Daily- Kristina Zolota

ScienceDaily (Dec. 15, 2008) - Researchers in Nevada are reporting that waste coffee grounds can provide a cheap, abundant, and environmentally friendly source of biodiesel fuel for powering cars and trucks.

In the new study, Mano Misra, Susanta Mohapatra, and Narasimharao Kondamudi note that the major barrier to wider use of biodiesel fuel is lack of a low-cost, high quality source, or feedstock, for producing that new energy source. Spent coffee grounds contain between 11 and 20 percent oil by weight. That's about as much as traditional biodiesel feedstocks such as rapeseed, palm, and soybean oil.

Growers produce more than 16 billion pounds of coffee around the world each year. The used or "spent" grounds remaining from production of espresso, cappuccino, and plain old-fashioned cups of java, often wind up in the trash or find use as soil conditioner. The scientists estimated, however, that spent coffee grounds can potentially add 340 million gallons of biodiesel to the world's fuel supply.

To verify it, the scientists collected spent coffee grounds from a multinational coffeehouse chain and separated the oil. They then used an inexpensive process to convert 100 percent of the oil into biodiesel.

The resulting coffee-based fuel - which actually smells like java - had a major advantage in being more stable than traditional biodiesel due to coffee's high antioxidant content, the researchers say. Solids left over from the conversion can be converted to ethanol or used as compost, the report notes. The scientists estimate that the process could make a profit of more than $8 million a year in the U.S. alone. They plan to develop a small pilot plant to produce and test the experimental fuel within the next six to eight months.

Biodiesel is a growing market. Estimates suggest that annual global production of biodiesel will hit the 3 billion gallon mark by 2010. The fuel can be made from soybean oil, palm oil, peanut oil, and other vegetable oils; animal fat; and even cooking oil recycled from restaurant French fry makers. Biodiesel also can be added to regular diesel fuel. It also can be a stand-alone fuel, used by itself as an alternative fuel for diesel engines.

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