http://www.thepigsite.com/LatestNews/?AREA=LatestNews&Display=7278
Tuesday, April 13, 2004
Converting Swine Manure to Oil: U of I Makes the Process Faster, Easier
URBANA - Swine manure might just be the surprising key to reducing crude oil
imports and creating a new industry in the United States.
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Swine manure is being converted to crude oil at the University of Illinois
using a thermochemical conversion (TCC) process. But researchers have refined
this existing process to make it more efficient and faster. The economic impact
of such technology could be dramatic.
"If 50 percent of swine farms adopted this technology, we could see a $1.5
billion reduction in crude oil imports every year," said Yuanhui Zhang, U of I
agricultural engineer. "And swine producers could see a 10-percent increase in
their income--about $10 to $15 per hog."
In addition, Zhang said, the environmental benefits of this research are
numerous. Minerals are preserved in the after treatment stream, odor is reduced
and the oxygen demand of manure is reduced by 70 percent.
TCC is a chemical process that reforms organic compounds in a heated and
pressurized enclosure to produce oil and gas. The process that Zhang has
developed uses swine manure as the organic material and coverts it to crude oil
using a small-scale batch TCC reactor developed by Zhang's research team.
According to Zhang, they conducted a series of experiments on variables that
affected the oil conversion efficiency and oil quality. As result, they were
able to define the desirable temperature range for the process, and reduce the
retention time to about 15 minutes. (Retention time is the time required for
the manure to remain in the TCC processor to allow oil conversion.)
"The process we have developed is quite different from most conventional TCC
processes," said Zhang. "There is no need for the addition of a catalyst, and
our process does not require pre-drying of the manure. Swine manure containing
80-percent water can be fed directly into the reactor."
Although the presence of water requires more energy to heat up the media, Zhang
added, most of that energy can be recovered with a heat exchanger.
With the batch reactor, researchers achieved an average of 70-percent
conversion from swine manure volatile solids to oil. At that conversion
efficiency, the manure excreted by one pig during the production cycle could
produce up to 21 gallons of crude oil. What's more, a swine farm producing
10,000 market hogs per year could produce 5,000 barrels of crude oil per year.
"We further processed the TCC crude oil in our lab and obtained refined oil
that had a heating value similar to that of diesel fuel," Zhang said.
The next step for Zhang's research team is to develop the batch process into a
continuous-mode process.
"In a continuous TCC process, the heat generated from the process can be
recycled more efficiently, reducing the operating costs," said Zhang. "Reactor
volume can be reduced for the same capacity, which reduces the investment
costs, and automated controls can be adapted more readily, which reduces the
labor costs."
Eventually, Zhang hopes to develop a TCC pilot plant which will increase
production capacity and allow them to analyze the oil properties and seek
alternative applications of the TCC oil, such as making plastics or ink.
"Developing a continuous TCC reactor will advance this technology one step
closer to a TCC pilot plant," said Zhang.
Zhang's research proposal was approved for funding under the Grainger Emerging
Technology Program in the College of Engineering and awarded $100,000.
Source: ACES News - 23rd March 2004
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