[Digestion] Eugene Biogas Bus pilot project

[Rob Williams]

Warren,
For a discussion on a variety of biogas upgrading technologies, take a look 
at "

Biomethane from Dairy Waste: A Sourcebook for the Production and Use of 
Renewable Natural Gas in California" (Krich et al., 2005) [especially 
chapter 3].

Available here: http://www.suscon.org/news/biomethane_report/index.asp

There a number of public waste water treatment facilities in California 
that add materials (other than sludge from wastewater treatment) to their 
digesters. Examples include restaurant trap grease, waste vegetable oils, 
slaughter house waste, other food processing wastes and manure.
Inland Empire Utilities Agency, East Bay MUD, Watsonville, Ventura County 
(or one or more cities in Ventura Co.), San Francisco and others are 
currently co-digesting or investigating the topic.

At 09:38 PM 11/12/2007, Warren Weisman wrote:

>I'm getting the final information over the next two
>weeks for a proposal to the US DOE Clean Cities
>Program and CMAQ for our biogas bus project here in
>Eugene, OR.
>
>The project is a partnership between City of Eugene,
>Eugene Sustainability Manager Felicity Fahy,
>Metropolitan Wastewater Management Commission, Lane
>Transit District and Lane Community College.
>
>After examining several options that included
>fumigation, running a 30% biodiesel and 70% biomethane
>mix, we've decided it's worth the extra money to
>pursue a preowned CNG bus. It was not so much engine
>changeout, or "repowering" as its called in the biz,
>it was the storage rack for the cylinders and will be
>easier to comply with regulations for passenger
>vehicles. This bus will run 100% biomethane captured
>from our wastewater plant.
>
>We will be "sharing" the biogas with a GE Jenbacher in
>operation at the plant. We will put in a control valve
>after the carbon filters and iron sponge that remove
>the siloxanes and H2S. They do not filter out the CO2
>for the stationary generator, but we will have to
>before our compressors.
>
>We will be using either a FMQ 8 or FMQ 10 from
>http://www.fuelmaker.com for compressors and fueling
>station. They already installed a CNG fueling station
>in our city at the state motor pool. Most likely we
>will slow-fill a storage tank and then fast-fill the
>bus so we can refuel at the wastewater plant. There
>are no facilities for refueling it at the bus yard. We
>are looking at using membrane separation to remove the
>CO2, but would like to know if anybody has experience
>with the water column separation system? or
>alternatives?
>
>I'd also like to know if there are other wastewater
>facilities adding carbon from agricultural waste to
>increase gas yields? or where I could look for some
>info on this.
>
>I could also use some leads on pre-owned CNG buses in
>North America that is still in decent shape.
>
>Warren Weisman
>USA
>
>
> 
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>http://www.adelaide.edu.au/biogas/
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