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The impact of the particle size of meat and bone meal (MBM) incineration ash on phosphate precipitation and phosphorus recovery

Journal of Environmental Chemical Engineering, ISSN: 2213-3437, Vol: 9, Issue: 3, Page: 105247
2021
  • 10
    Citations
  • 0
    Usage
  • 40
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    10
    • Citation Indexes
      10
  • Captures
    40

Article Description

Meat and bone meal (MBM) ash was characterized and used for phosphate wastewater treatment and phosphorus recovery. The bottom ash (MBM-BA) with size >250 µm accounted for ~80% and distributed evenly in the >1000 µm, 500–1000 µm, and 250–500 µm fractions, while air pollution control residue (MBM-APCr) distributed evenly among the 250–500 µm, 125–250 µm, and <125 µm fractions. The P content in ash ranged 7.9–15.6% depending on particle size, and P content in MBM-BA (14.33%) was higher than MBM-APCr (9.28%). P in both MBM-BA and MBM-APCr was mainly hydroxyapatite (HAP) as analysed by X-ray powder diffraction (XRD). Decreased HAP and increased Ca(OH) 2 were observed with decreasing particle size of MBM-BA. NaCl and Na 2 SO 4 ·3K 2 SO 4 were found with high content in the MBM-APCr, and increased as decreasing size. Ash type, pH, and particle size had significant effects on phosphate removal from synthetic wastewater. Phosphate removal capacities of 13.5–279 and 13.5–36.6 mg PO 4 3– /g ash were obtained using MBM-BA and MBM-APCr, respectively. Phosphate removal capacities were particle size-dependent; the smaller the size, the higher the capacity: those for MBM-BA of size >1000 µm and <63 µm were 13.5 and 279 mg/g, respectively. Equilibrium pH > 8 was favorable to P removal. Based on the compositions of the solid phases, extracts before and after treatment, and Ca/P ratio 1.22–1.73, the phosphate removal mechanisms were dominated by HAP crystallization/precipitation. Using MBM-BA for wastewater treatment increased its P content to 16.30%. Depending on particle size, the acid consumption for P recovery of 84% from MBM-BA was 2.6–3.0 mM H + /mM P. Strategies for management and utilization of MBMA according to these findings were proposed.

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