Removal and recovery of nutrients as struvite from anaerobic digestion residues of poultry manure

Y. D. Yilmazel, G. N. Demirer

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42 Scopus citations

Abstract

The removal and the recovery of nutrients, namely nitrogen (N) and phosphorus (P) from anaerobically digested and solid-liquid separated manure effluents via struvite precipitation were investigated. Both the liquid and the solid phases of the poultry manure digester effluent were subjected to struvite precipitation experiments. The Mg:N:P molar ratio of 1:1:1 in the liquid phase resulted in an average NH4-N removal efficiency of 86.4%, which increased to 97.4% by adjusting the Mg:N:P ratio to 1.5:1:1. The acidic phosphorus-dissolution process was applied to the solid phase of the effluent to obtain a phosphorus-enriched solution. Nutrient recovery experiments with NaOH as the buffering reagent were conducted with and without addition of external chemicals (Mg and P sources) to evaluate the influence of the Mg:N:P molar ratio, the Mg:P molar ratio and pH. All the experiments depicted complete PO4-P (99.6-100.0%) and partial NH4 -N (3.3-65.6%) recoveries from the phosphorus-enriched solution.

Original languageEnglish
Pages (from-to)783-794
Number of pages12
JournalEnvironmental Technology (United Kingdom)
Volume32
Issue number7
DOIs
StatePublished - May 2011

Keywords

  • anaerobic digestion
  • nutrient recovery
  • phosphorus dissolution
  • poultry manure
  • struvite

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