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

YILMAZEL Y. D., Demirer G. N.

ENVIRONMENTAL TECHNOLOGY, cilt.32, sa.7, ss.783-794, 2011 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 32 Sayı: 7
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1080/09593330.2010.512925
  • Dergi Adı: ENVIRONMENTAL TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.783-794
  • Anahtar Kelimeler: anaerobic digestion, poultry manure, nutrient recovery, phosphorus dissolution, struvite, WASTE-WATER, PHOSPHORUS RECOVERY, SEWAGE-SLUDGE, PRECIPITATION, PHOSPHATE, CRYSTALLIZATION, CALCIUM, AMMONIA, LIQUID, IMPACT
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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.