Specialized powder fashioned primarily from calcium ... The recovery is part of Tokyo's effort to transform a large portion of the sewage sludge generated in one of the largest cities in the ...

NAGOYA--Sludge generated through sewage treatment is set to be marketed by city officials here as the perfect fertilizer rich in nitrogen and phosphorus. Nitrogen is an indispensable ingredient ...

It is the waste from a human sewage treatment plant. It's called sludge. It's foamy yellow sludge. They scrape it off the top ...