Image via Wikipedia The other day I was watching a TV program about domestic wastewater treatment and I kept wondering about what happened to the sludge left behind. Well, it seems like there are companies out there doing the thinking for me...
Image via Wikipedia The other day I was watching a TV program about domestic wastewater treatment and I kept wondering about what happened to the sludge left behind. Well, it seems like there are companies out there doing the thinking for me...