We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Nutrient recovery from manure digestate by using waste magnesite powder and bone meal as sustainable substitutes for struvite precipitation.
- Authors
Kutlar, Feride Ece; Engin, Iskin; Yilmazel, Yasemin Dilsad
- Abstract
BACKGROUND: Struvite (MgNH4PO4.6H2O) precipitation is a sustainable approach that can offer simultaneous removal/recovery of nutrients from biogas plant effluents. However, most biogas plant effluents contain a higher molar concentration of nitrogen (N) than magnesium (Mg) and phosphorus (P). Therefore, the external addition of Mg2+ and phosphate (PO43‐) salts is needed to maximize the recovery. In this study, Mg‐rich waste magnesite powder and P‐rich bone meal were used as sustainable additives. The Box–Behnken design was applied to determine optimum conditions of process parameters (pH, Mg:N and P:N molar ratios) to maximize ammonium‐nitrogen (NH4‐N), PO4‐P and Mg2+recoveries. RESULTS: NH4‐N, PO4‐P and Mg2+ recoveries were in the ranges 78.5%–96.9%, 69.2%–96.3% and 75.1%–99.9%, respectively. The actual and predicted values showed significant consistency, indicating that the model is satisfactory. Under optimum conditions (pH = 9.0, Mg:N = 2.2, P:N = 1.8), 97.8 ± 0.1% NH4‐N, 96.6 ± 0.31% PO4‐P and 84.4 ± 0.9% Mg2+ recovery were attained. The X‐ray diffraction results confirmed the sole presence of struvite crystals. Scanning electron microscopy images showed irregular prismatic orthorhombic crystals and amorphous material depositions on precipitates of ~25 μm crystal size. The product was 49% struvite with 15.2% P content. The heavy metal content was lower than regulatory limits. CONCLUSION: Even though waste material and industrial by‐products have been used as additives in this process, high NH4‐N and PO4‐P recoveries were recorded under optimum conditions. These results are promising and illustrate a powerful example of industrial symbiosis, and the precipitate containing struvite can serve as a valuable product. © 2024 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).
- Subjects
SOCIETY of Chemical Industry (Great Britain); JOHN Wiley &; Sons Inc.; MAGNESITE; POWDERS; MOLARITY; AMORPHOUS substances; INDUSTRIAL ecology; MANURES
- Publication
Journal of Chemical Technology & Biotechnology, 2024, Vol 99, Issue 7, p1671
- ISSN
0268-2575
- Publication type
Article
- DOI
10.1002/jctb.7661