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Chemists Get Scoop On Crude 'Oil' From Pig Manure

Date:
June 17, 2008
Source:
National Institute of Standards and Technology
Summary:
Researchers have developed the first detailed chemical analysis revealing what processing is needed to transform pig manure derived 'crude oil' into fuel for vehicles or heating. Mass production of this type of biofuel could help consume a waste product overflowing at US farms, but it will require a lot of refining.

Mass production of biofuel made from pig manure could help consume a waste product overflowing at U.S. farms, and possibly enable cutbacks in the nation's petroleum use and imports. But, according to a new NIST paper, pig manure crude will require a lot of refining.
Credit: NIST

After a close examination of crude oil made from pig manure, chemists at the National Institute of Standards and Technology (NIST) are certain about a number of things. Most obviously, "This stuff smells worse than manure," says NIST chemist Tom Bruno.

But a job's a job, so the NIST team has developed the first detailed chemical analysis revealing what processing is needed to transform pig manure crude oil into fuel for vehicles or heating. Mass production of this type of biofuel could help consume a waste product overflowing at U.S. farms, and possibly enable cutbacks in the nation's petroleum use and imports. But, according to a new NIST paper, pig manure crude will require a lot of refining.

The ersatz oil used in the NIST analyses was provided by engineer Yuanhui Zhang of the University of Illinois Urbana-Champaign. Zhang developed a system using heat and pressure to transform organic compounds such as manure into oil.

As described in the new paper, Bruno and colleagues determined that the pig manure crude contains at least 83 major compounds, including many components that would need to be removed, such as about 15 percent water by volume, sulfur that otherwise could end up as pollution in vehicle exhaust, and lots of char waste containing heavy metals, including iron, zinc, silver, cobalt, chromium, lanthanum, scandium, tungsten and minute amounts of gold and hafnium. Whatever the pigs eat, from dirt to nutritional supplements, ends up in the oil.

While the thick black liquid may look like its petroleum-based counterparts, the NIST study shows that looks can be deceiving. "The fact that pig manure crude oil contains a lot of water is unfavorable. They would need to get the water out," Bruno says.

The measurements were made with a new NIST test method and apparatus, the advanced distillation curve, which provides highly detailed and accurate data on the makeup and performance of complex fluids. A distillation curve charts the percentage of the total mixture that evaporates as a sample is slowly heated. Because the different components of a complex mixture typically have different boiling points, a distillation curve gives a good measure of the relative amount of each component in the mixture. NIST chemists enhanced the traditional technique by improving precision and control of temperature measurements and adding the capability to analyze the chemical composition of each boiling fraction using a variety of advanced methods.

NIST researchers analyzed the graphite-like char remaining after the distillation by bombarding it with neutrons, a non-destructive way of identifying the types and amounts of elements present. Two complementary neutron methods detected the heavy metals listed above.

Bruno and colleagues currently spend much of their time analyzing military jet fuels and are not planning a major foray into pig manure. But Bruno concedes that the effort may have a payoff. "Who knows, it might help decrease the nuisance of manure piles."


Story Source:

The above story is based on materials provided by National Institute of Standards and Technology. Note: Materials may be edited for content and length.


Journal Reference:

  1. OTT et al. Advanced distillation curve measurement: Application to a bio-derived crude oil prepared from swine manure☆. Fuel, 2008; DOI: 10.1016/j.fuel.2008.04.038

Cite This Page:

National Institute of Standards and Technology. "Chemists Get Scoop On Crude 'Oil' From Pig Manure." ScienceDaily. ScienceDaily, 17 June 2008. <www.sciencedaily.com/releases/2008/06/080612095527.htm>.
National Institute of Standards and Technology. (2008, June 17). Chemists Get Scoop On Crude 'Oil' From Pig Manure. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2008/06/080612095527.htm
National Institute of Standards and Technology. "Chemists Get Scoop On Crude 'Oil' From Pig Manure." ScienceDaily. www.sciencedaily.com/releases/2008/06/080612095527.htm (accessed July 28, 2014).

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