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Full Scale Plant Testing of a Process that Uses Sewage Sludge to Produce an Organically-Enhanced Granular Nitrogen Fertilizer

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A full scale granulation testing facility was utilized to confirm process chemical and physical operating parameters and product fertilizer composition for the production of an inorganic/organic (sewage sludge) granulated nitrogen fertilizer. This technology was developed and commercialized in 1996 and optimized in full scale testing completed in 2006 and 2008. Dewatered sewage sludge was used as a replacement for water as the granulator pipe-cross reactor cooling agent. Pipe-cross reactor raw materials included sulfuric acid, anhydrous ammonia, and conditioned sludge. Granulator raw materials included slurry discharge from the pipe cross reactor, anhydrous ammonia, aluminum sulfate, granulated ferric sulfate, and recycled product. Final fertilizer product meets all EPA Part 503 standards and fertilizer industry standards end point conditions of hardness, critical relative humidity and moisture including 17-18% nitrogen with 7.5% organic matter, 4% total carbon, 3% amino acids and micronutrients. This is a true beneficial use technology with value added components that recycle important nutrients to farm soils with less nutrient loss to the environment.
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Keywords: amino acids; fertilizer; granulation; micronutrients; nitrogen; organic matter; pipe-cross reactor; sewage sludge

Document Type: Research Article

Publication date: 2010-01-01

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