Leng, L;
Zhang, W;
Li, H;
Bogush, AA;
Stegemann, JA;
Huang, H;
(2021)
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
, 9
(3)
, Article 105247. 10.1016/j.jece.2021.105247.
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Leng et al (2020) MBM Incineration ash for recovery of P from wastewater- particle size JCLEPRO-S-20-31194 (manuscript for UCL Discovery).pdf - Accepted Version Download (4MB) | Preview |
Abstract
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 Na2SO4·3K2SO4 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 PO43-/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.
| Type: | Article |
|---|---|
| Title: | The impact of the particle size of meat and bone meal (MBM) incineration ash on phosphate precipitation and phosphorus recovery |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jece.2021.105247 |
| Publisher version: | https://doi.org/10.1016/j.jece.2021.105247 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10125539 |
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