The determination of fertilizer quality of the formed struvite from effluent of a sewage sludge anaerobic digester

UYSAL A., YILMAZEL Y. D., DEMİRER G. N.

JOURNAL OF HAZARDOUS MATERIALS, cilt.181, ss.248-254, 2010 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 181
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.jhazmat.2010.05.004
  • Dergi Adı: JOURNAL OF HAZARDOUS MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.248-254
  • Anahtar Kelimeler: Anaerobic digester, Fertilizer quality, Heavy metal, Micropollutant, Struvite precipitation, MAGNESIUM AMMONIUM PHOSPHATE, WATER TREATMENT PLANTS, WASTE-WATER, PHOSPHORUS RECOVERY, POLYCHLORINATED-BIPHENYLS, LANDFILL LEACHATE, HEAVY-METALS, PILOT-SCALE, REMOVAL, PRECIPITATION
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

The formation of struvite (MgNH4PO4 center dot 6H(2)O) in wastewater treatment plants can lead to scaling and thus operational problems reducing the treatment efficiency. However, struvite has significant commercial value as an agricultural fertilizer. Therefore, controlled struvite formation in wastewater treatment plants not only presents an opportunity to recover nutrients but also corresponds to the valorization of wastes. NH4-N and PO4-P removal and recovery from the effluent of a full-scale sewage sludge anaerobic digester via controlled struvite precipitation were investigated in this study. The effect of the residual heavy metal and micropollutant content of the formed struvite on fertilizer quality was also evaluated. Removal efficiencies of NH4-N, PO4-P and COD were 89.35%, 95% and 39.78% when Mg:N:P molar ratio was 1.5:1:1 and pH was 9.0. Mercury, nickel, zinc and chrome concentrations derived from struvite precipitation were below the regulatory limit for fertilizer usage in Turkey. The precipitate did not contain polychlorinated biphenyls (PCB). X-ray diffraction (XRD) analysis conducted on the precipitate indicated a struvite formation. (C) 2010 Elsevier B.V. All rights reserved.