TY - JOUR
T1 - Aerated Fluidized Bed Treatment for Phosphate Recovery from Dairy and Swine Wastewater
AU - Rabinovich, Alon
AU - Rouff, Ashaki A.
AU - Lew, Beni
AU - Ramlogan, Marlon V.
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2018/1/2
Y1 - 2018/1/2
N2 - An aerated fluidized bed reactor (aerated-FBR) was used for recovery of orthophosphate (PO4-P) from dairy wastewater (D-WW) and swine wastewater (S-WW) by struvite (MgNH4PO4·6H2O) precipitation. Model wastewater solutions (S-model, D-model) free of organic material were also treated. The maximum PO4-P recovery for treated livestock wastes was 94% for S-WW and 63% for D-WW. The PO4-P recovery did not improve for S-model compared to S-WW, but increased to 81% for D-model relative to D-WW, suggesting that the high organic content of D-WW may hinder the recovery process. X-ray diffraction (XRD) analysis of recovered solids revealed that treated S-WW produced mostly struvite (95-98%) while D-WW yielded a mixture of struvite (28-33%), calcite (CaCO3; 17-55%), and monohydrocalcite (CaCO3·H2O; 13-42%). The Fourier transform infrared (FTIR) spectra of the solids confirm the presence of vibrational bands associated with these minerals. Simultaneous thermal analysis (STA) indicated that all solids, except for D-WW, show thermogravimetric (TG) trends consistent with the struvite and calcium carbonate content. The D-WW solids had additional TG steps, possibly due to high organic and colloidal content, and slightly improved ammonium stability. The aerated-FBR treatment is an effective method to reduce PO4-P from livestock wastewater through precipitation of pure struvite and struvite/calcium carbonate mixtures.
AB - An aerated fluidized bed reactor (aerated-FBR) was used for recovery of orthophosphate (PO4-P) from dairy wastewater (D-WW) and swine wastewater (S-WW) by struvite (MgNH4PO4·6H2O) precipitation. Model wastewater solutions (S-model, D-model) free of organic material were also treated. The maximum PO4-P recovery for treated livestock wastes was 94% for S-WW and 63% for D-WW. The PO4-P recovery did not improve for S-model compared to S-WW, but increased to 81% for D-model relative to D-WW, suggesting that the high organic content of D-WW may hinder the recovery process. X-ray diffraction (XRD) analysis of recovered solids revealed that treated S-WW produced mostly struvite (95-98%) while D-WW yielded a mixture of struvite (28-33%), calcite (CaCO3; 17-55%), and monohydrocalcite (CaCO3·H2O; 13-42%). The Fourier transform infrared (FTIR) spectra of the solids confirm the presence of vibrational bands associated with these minerals. Simultaneous thermal analysis (STA) indicated that all solids, except for D-WW, show thermogravimetric (TG) trends consistent with the struvite and calcium carbonate content. The D-WW solids had additional TG steps, possibly due to high organic and colloidal content, and slightly improved ammonium stability. The aerated-FBR treatment is an effective method to reduce PO4-P from livestock wastewater through precipitation of pure struvite and struvite/calcium carbonate mixtures.
KW - Aerated fluidized bed
KW - FTIR
KW - Livestock wastewater
KW - Nutrient recycling
KW - STA-EGA
KW - Struvite
KW - XRD
UR - http://www.scopus.com/inward/record.url?scp=85040066083&partnerID=8YFLogxK
U2 - 10.1021/acssuschemeng.7b02990
DO - 10.1021/acssuschemeng.7b02990
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AN - SCOPUS:85040066083
SN - 2168-0485
VL - 6
SP - 652
EP - 659
JO - ACS Sustainable Chemistry and Engineering
JF - ACS Sustainable Chemistry and Engineering
IS - 1
ER -