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50 comments on Abundant Skies: 8 Principles for Successful Rainwater Harvesting
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50 comments on Abundant Skies: 8 Principles for Successful Rainwater Harvesting
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you can recycle plastics.
"you can recycle plastics." No, I can't unless I develop a process that uses machinery, petrochemicals, and a good bit of fossil energy. Have you seen the size of the extruding equipment to make PVC pipe?
If there is a manufacturer, without transportation, I won't be able to get re manufactured plastic piping from afar. PVC pipe is durable and resistant to the sunlight. Stuff that is home made will not last long. Peak Oil means things will change and won't be so easy, and often not possible. Better to prepare by thinking of the difficulties ahead, rather than glossing over things and saying we can do it. In the long run most of this manufactured stuff will be gone. Plan ahead.
you can't, but society at large can. just look how many plastic bottles we recycle.
http://en.wikipedia.org/wiki/Plastic_recycling
right now PVC is not recycled much but only because it is not cost effective. once it is that will help.
http://en.wikipedia.org/wiki/PVC#Recycling
and just how are those plastic bottles recycled, that is by what energy?
I don't know specifically. fossil fuels are involved, but it takes a lot less energy to recycle plastic than to make it from scratch. there is probably no reason why we can't use wind, solar and hydro in lieu of fossil fuels when the need comes.
Polyethylene terephthalate may be pressure-cooked with methanol, and the monomers recovered in methylated form. This represents a savings over making new ethylene glycol and terephthalic acid. The process does require some chemistry, of course.
As far as I know, PETE is the only manmade polymer which is recoverable in this manner. Other plastics can only be "downcycled" into higher-entropy materials such as road surface, wood substitutes, or fuel. And PVC pipe is downright nasty as fuel (phosgene, dioxins and such...)