Are you sure that wasn't milorganite?
I had to look up Milorganite (about which I knew nothing) recently. Went to Wikipedia (the journalist's last refuge) and found this, which I thought worthy of sharing:
Milorganite is the trademark of a biosolids fertilizer produced by the Milwaukee Metropolitan Sewerage District.[1] The District captures wastewater from the Milwaukee metropolitan area, including local industries. This water is then treated at the Jones Island Water Reclamation Facility in Milwaukee, Wisconsin with microbes to digest nutrients that are found in it. Cleaned water is then returned to Lake Michigan. The recycled product, high nitrogen fertilizer, is sold throughout the world, reduces the need for manufactured nutrients, and after more than 75 years is one of the largest and most continuous examples of such programs.[1][2][3][4]
History[edit]
Milorganite’s history 'began with Milwaukee’s goal to clean up its rivers and Lake Michigan." Rather than land filling sludge or microorganisms, they were used in a pioneering effort to make, distribute and sell fertilizer.[4] "It's production is among the largest recycling programs in the world."[3][5]
The Jones Island Plant was among the first sewage treatment plants in the United States to succeed in using the activated sludge treatment process.[6] "It was the first treatment facility to economically dispose of the recovered sludge by producing an organic fertilizer." In the early 1980s the plant needed extensive reworking, "this does not detract from its historic significance as a pioneering facility in the field of pollution control technology."[5] "The world’s first large scale wastewater treatment plant was constructed on Jones Island, near the shore of Lake Michigan."[7] It had the largest capacity of any plant in the world when constructed.[8] The 1925 plant has been designated as a Historic Civil Engineering Landmark by the American Society of Civil Engineers.[6][9]
The name Milorganite is a concatenation of the phrase Milwaukee Organic Nitrogen, and was the result of a 1925 naming contest held in National Fertilizer Magazine. Raising taxes for public health was relatively controversial in the early 1900s. In 1911, reform minded socialists were elected on a platform calling for construction of a wastewater treatment plant to protect against water borne pathogens.[10][11] Experiments showed that heat dried activated sludge pellets "compared favorably with standard organic materials such as dried blood, tankage, fish scap, and cottonseed meal."[12] Sales to golf courses, turf farms and flower growers began in 1926.[13] Milorganite was popularized during the 1930s and 1940s before inorganic urea became available to homeowners after WWII. With the help of researchers in the College of Agriculture at the University of Wisconsin, the use of waste solids (i.e., activated sludge) as a source of fertilizer was first developed in the early 20th century.[2]
It goes on from there, at
http://en.wikipedia.org/wiki/Milorganite.
I wonder if National Fertilizer magazine has a Website...