Ammonia removed from sewage could be repurposed as a revolutionary green fertilizer, producing 5 to 10 times less greenhouse gas emissions than the current process which guzzles up huge amounts of energy, with a large emissions footprint. Ammonia (a valuable core fertilizer ingredient) must be removed from sewage water in expensive treatment plants to stop it leaching into the environment. For fertilizer manufacturers and farmers, stripping ammonia from wastewater (air-stripping) is uniquely economical. Ammonia sulfate is priced at around $0.640 per kilo on U.S. farms. The selling price from air stripping needs to be just $0.046 to break even of production costs–92% lower than farm prices, leaving a large margin for profit-making.
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