 Geek Alert: Transparent Wood!
Check out this article about some of the new wood science being done by engineers and scientists out there like Céline Montanari at the KTH Royal Institute of Technology in Stockholm. The idea of using the plant cells in wood and then filling them with a fluid that helps with temperature control? Will we be using transparent wood to provide light and improve passive solar properties of our houses in mountain climates? I can imagine now how much that would be appreciate during the short dark days of winter. Sometimes people tell me I'm just too optimistic, with my head in the clouds over all these innovations. But as with all progress, we have to dream big and try lots of different ideas, knowing that not all will become big commercial successes. I love to celebrate the people who are dreaming about how to use wood products in new ways that will be reflect a new, low-carbon world. Right now the State of California is developing a new wood products academic center of excellence, and I'll write about that when I learn more details about where it will be based and who will be directing this exciting new program.
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 Photo by Ruslan Khadyev on Unsplash Since I’ve had a chance to live and spend time in Japan, the United States, and Mexico, not to mention all the time spent in industrial facilities all over the world, I’ve been able to see a number of different approaches to razing buildings. I love the term “razing,” because it can encompass a whole range of different techniques.
The most elegant work I’ve seen is in Tokyo, where space constraints and very strict waste management rules means that buildings are not demolished but are dismantled piece by piece. Here is a great little video that shows some of the challenges and solutions of working in Japan. I’ve inspected many recycling facilities and building sites in Japan, and I will forever be in awe at the degree to which waste materials are separated and recycled, to avoid creating waste that must go into scarce landfill space. We could all learn a lot about recycling from Japan. There is even one technique, Daruma Otoshi, that involves removing a floor at a time, starting at the bottom of the building. This remains one of my favorite ever demolition videos, especially since I’ve spent a lot of time inside the Prince Hotel before it was closed down. And another short video that does a great job of showing Daruma Otoshi in time lapse. With our excess of space and cheap landfills in the United States, we’re not quite so careful. In fact, we’re famous for our method of imploding buildings, which has spread to other areas of the world. There are even highlight reels of annual building implosions, including this one. Of course, we still demolish most buildings with heavy equipment and a lot of time and effort. Two of the most common methods are with a wrecking ball (old school) and with a high reach excavator (newer school). Building demolition in the U.S. can create a huge amount of dust, and cleaning up afterwards is really just picking everything up and trucking it all to a landfill. That means you have to remove any hazardous building materials before any demolition starts. Hazardous building materials can include asbestos, both in insulation and in everything from wall board to floor tiles. Use of friable asbestos was phased out before 1980, but asbestos can still be found in a wide range of building materials at relatively low concentrations. Lead-based paint has a similar story. It is still used on some exterior applications and was used quite a bit on interiors before 1978. Before polychlorinated biphenyls were banned in 1979, they were used extensively as insulation in liquid filled electrical equipment ranging from transformers and capacitors to small fluorescent light fixture ballasts. PCBs were also used as a plasticizer in paint (mostly in places like ships), and caulking. All of these hazardous building materials are strictly regulated as wastes and must be separated from other kinds of demolition waste. Asbestos gets landfilled in specially designed landfills where it can be sufficiently contained. Lead debris gets stabilized by mixing with concrete so that it won’t leach into the groundwater when it is landfilled. And all PCB waste gets incinerated at facilities that are designed to destroy these persistent organic chemicals at a 99.9999% destruction and removal efficiency. |
Marty WaltersEnvironmental Scientist Archives
February 2021
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