San Francisco Greasecycle Program
For the past several months the San Francisco Public Utility Commission (SFPUC) has begun picking up used cooking oil from restaurants and businesses for free in an effort to find fuel alternatives for its municipal fleet. The city hopes to expand the grease recycling program (called SFGreasecycle) to include small-scale household pickups and eventually power all city vehicles on biodiesel, including public buses and fire trucks. The oil is picked from local restaurants by SFPUC trucks, dropped off at a transfer station, filtered, transferred into a multi storage tank settling system, then decanted for three days. The oil is then sold to a biodiesel plant using bulk transport tractor-trailer pickups.
“Even a little grease causes problems. Fats, oils, and grease (FOG) down kitchen drains dramatically impact the flow and performance of our combined sewer system. Many residents generate only a bit of used cooking oil. But the cumulative effect from a lot of homes contributes to clogging sewers. Please don’t pour ANY used oil down the drain. Instead, collect it in a container and throw it in the trash.”
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June 12th, 2008
I am upset that in this poll 65% of the correspondents somehow believe bio-fuels is going to be an alternative to our current energy process.
Bio-fuels, as a waste system, as the diagram proposes above, is using the by-product of an already utilized item to be used as energy.
Bio-fuels, on the other hand, in terms of industrial growing of corn and supplying it for fuel, is unsustainable on so many levels. Even the practices surrounding mass-farming of corn ( tractor & milling vehicles, fertilizer ) are fossil-fuel dependent.
In terms of subsidies, and being a SMALL supplement to the energy market, mass-farming for bio-fuels could be essential. But it is unsustainable in the long run.
June 28th, 2008
Marquis, you are wrong in many, many ways. Shortsighted at best. Corn is just one of many biofuels options, and it is definitely a poor biofuels crop, but is one of many options. And don’t forget corn is being used primarily for ethanol, so you exclude biodiesel all together by focusing on your corn complaint. What you should look at are feedstocks like algae which can be produced using 5% of the water of typical agriculture (brackish water at that), and grown in arid waste lands. Algae farms can product up to 10,000 gallons of biofuels per acre (versus 55 to 700 gallons per acre for current typical biofuels feedstocks). Algae is completely sustainable and can produce more than enough biofuel, and not only that it can create human and animal feed oils rich in nutrients, protein and triglyceride oils. Read up, you are focused on a negative and very narrow view of biofuels crops. There are incredible options developing, you would do well to educate yourself better.
June 29th, 2008
Dave,
You prove to be quite right in this subject. Just curious to know if you’re in the algae biofuel business/research.
September 25th, 2008
I think algal pools will prove to be successful, but the carbon dioxide pumping, the water usage, exacting the environment to prevent fuel contamination, and the technology that is still in its infancy, will prove to be great.
My whole point is that when bio-fuels did become a forefront topic, the only thing people looked to was corn. I don’t count algae development as the same as bio-fuels. Taxonomy-wise yes, but in terms of the investments needed, it needs to have its own name since it has such a better and more powerful prospect than corn transformation.
Currently, all these systems run on a great deal of fossil fuel energy, whether it is to create corn ( phosphorus and petroleum ) or algae ( pumping manufacturing, water transporting, and closed-lab creations. ).
I am not trying to be pessimistic; I am hoping that if someone see the whole picture, they can come up with a solution, and not just a quick fix that the corn craze was going to be.
Things like this and oil-shale should’ve kept us out of this mess, and it hasn’t. I will wait and be content when the prospect of algal fuel can affect at least 10% of the population without any damage to our energy infrastructure to be happy.
We’ll find out in 2011 I guess.