Integrated Decentralized Treatment for Improved N and K Recovery from Urine

Neha Jagtap, Treavor H. Boyer

Research output: Contribution to journalArticle

Abstract

Urine has been recognized as the main contributor of nitrogen (N), phosphorus (P), and potassium (K) at wastewater treatment plants, yet it makes up less than 1% of the volume. This study aimed to assess a novel decentralized approach of recovering N, P, and K from urine as separate fertilizer products. Previous work by the authors showed integrating struvite precipitation for P recovery, ammonia stripping-acid absorption for N recovery, and evaporation for K recovery was effective at recovering >80% N, P, and K from urine. However, improvements to the N and K treatment processes were still needed to produce urine-derived fertilizer products of similar nutrient composition and concentration as commercial fertilizers on the market. Two technologies, ammonia stripping-acid absorption and ion exchange, were evaluated for N removal and recovery as ammonium sulfate. Both treatments removed 70% of N but implementing ammonia stripping-acid absorption resulted in a higher concentration N product. Distillation was evaluated for K recovery as potash and nonpotable water recovery. The process was able to recover approximately 100% of K and over 50% of water in urine. Distillation of effluent from the ammonium stripping process resulted in a higher concentration of K in the potash product compared to effluent from the ion exchange process.

Original languageEnglish (US)
Article number04019015
JournalJournal of Sustainable Water in the Built Environment
Volume6
Issue number2
DOIs
StatePublished - Jan 1 2020
Externally publishedYes

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ASJC Scopus subject areas

  • Water Science and Technology
  • Management, Monitoring, Policy and Law

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