So, at the university where I'm doing
energy and
carbon consulting, there is a soil science professor who is a massive expert in
biochar. She really knows this stuff and can explain so many of its properties, give optimum recipes for given applications, and wants to see it in widespread use. Of
course, as we got to talking earlier today, the question of economics came up: as much good as biochar does when charged up and incorporated into soil, we simply don't have production at any sort of scale that would bring the price down to a point that farmers would get truckloads of it and put it on their pastures and arable lands.
We agreed that if one were to make a lot of high quality biochar, it would be to everyone's advantage to use it for more than one function before it goes to the
land. In New Zealand, we have a huge problem with nitrate and phosphorus pollution in our streams and rivers. This originates on over-fertilised farmland and has made much of our fresh
water a stanky mess. Another huge problem we have is management of slash after forestry blocks are harvested. This past winter Tolaga Bay was wrecked by all the logs and debris carried off the hillsides and down the rivers. We also have lots of towns and industries whose consents to discharge treated sewage to rivers will expire soon, and the regional councils are unlikely to allow this practice to continue. This means
local wastewater managers will need to contemplate discharge to land and all that entails.
So, my plan is to turn that forestry "waste" into biochar. Take the char and put it into big bags and then place those across the tiny rivulets, drains and feeder streams coming off the pasture lands. Spread it on basins for treated sewage. The char will absorb the excess nutrients and accumulate a nice microbial inoculation in the process. Then, periodically gather it up, check it to ensure it's not full of anything nasty...if it is, then dump it in an old coal mine. If it's clean, then it goes to farms and gardens.
I just need to figure out how to scale the production side. Deploying a whole bunch of Kontiki kilns would be quick but require labour. Building a pyrolysis facility creates a problem of over-centralisation and is also capital intensive. Going to think on this a bit more.