Milorganite is the big brand that uses sewage. Most consumer grade fertilizer is cheap nitrogen in the form of urea along with some phosphorus and potassium and maybe a couple of other elements like iron, calcium and magnesium. You can complain that it's non organic, but chemical fertilizer is pretty safe. If you want good organic lawn care it's not cheap.
From the article it appears the use is more extensive than just the consumer-marketed milorganite. The sewage plants are sending it directly to farmers, so the food you buy at the store is likely to be fertilized by it from time to time. Hell, I wonder if it qualifies as an organic fertilizer.
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