Study of pig manure digestate pre-treatment for subsequent valorisation by struvite

Corona, Francisco; Hidalgo, María Dolores; Martín-Marroquín, Jesús M.; Meers, Erik

doi:10.1007/s11356-020-10918-6

Cited by 13 publications

(1 citation statement)

References 33 publications

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“…Conventionally applied anaerobic digesters treating PM are continuous stirred tank reactors (CSTRs), mainly focusing on methane production through co-digestion [78]. CSTRs barely retain nutrients and solids requiring additional treatment steps for nutrient removal or recovery [79][80][81]. Existing practices and research on phosphorus recovery from PM focuses on chemical precipitation assisted by mechanical separation from digestate or raw PM [82][83][84].…”

Section: Effect Of Calcium Addition On Treatment Performancementioning

confidence: 99%

Recovery of phosphorus from animal manure

Schott

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Chapter 1. Introduction 1.1. The Neolithic Revolution -From 4 million to 200 million people in 10,000 years 1.2. The Green Revolution -From 1.5 billion to 6 billion people in 100 years 1.3. Consequences of intensification 1.4. Nutrient hotspots and livestock farming 1.5. Key nutrient: phosphorus 1.6. Phosphorus recovery 1.7. Challenges for calcium phosphate granulation in black water and transition to animal manure 1.8. Scope and outline Chapter 2. Phosphorus recovery from pig manure: Dissolution of struvite and formation of calcium phosphate granules during anaerobic digestion with calcium addition Abstract 2.1. Introduction 2.2. Materials and methods 2.3. Results 2.4. Discussion 2.5. Conclusions Chapter 3. Innovation in valorization of cow manure: Higher hydrolysis, methane production and increased phosphorus retention using UASB technology Abstract 3.1. Introduction 3.2. Materials and methods 3.3. Results and Discussion 3.4. Conclusions Chapter 4. Enabling efficient phosphorus recovery from cow manure: Liberation of phosphorus through acidification and recovery of phosphorus as calcium phosphate granules. Abstract 4.1. Introduction 4.2. Materials and methods 4.3. Results and discussion 4.4. Conclusions Chapter 5. Potential impact on calcium phosphate recovery by hydrogen in anaerobic digestion of cow manure Abstract 5.1. Introduction 5.2. Materials and Methods 5.3. Results and discussion 5.4. Conclusions Chapter 6. General discussion and outlook 6.1. Anaerobic digestion of animal manure using UASB technology 6.2. Phosphorus recovery and calcium phosphate granules 6.3. Mechanisms for calcium phosphate granulation in animal manure 6.4. Process optimization 6.5. Applicability and feasibility 6.6. Implementation and impact Summary References Supplementary information A. Appendix Chapter 2 B. Appendix Chapter 3 C. Appendix Chapter 4 D. Appendix Chapter 5 E.

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Section: Effect Of Calcium Addition On Treatment Performancementioning

confidence: 99%

Recovery of phosphorus from animal manure

Schott

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Integrating Anaerobic Digestion With Struvite Production for Enhanced Nutrient Recovery, Pathogen Reduction, and Circularity in Manure Management

Nagarajan,

Goyette,

Raghavan

et al. 2024

J of Sust Agri & Env

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IntroductionAnaerobic digestion (AD) is essential for manure management, generating biogas and nutrient‐rich digestate for organic fertilizer. However, improper digestate use can pose environmental risks. Recovering struvite, a magnesium ammonium phosphate (MAP) compound, from digestate provides a sustainable, controlled‐release fertilizer, supporting a circular economy in agriculture.Materials and MethodsThe study employed a two‐stage (liquid–solid) AD process using poultry, dairy, and swine manures, along with wasted corn silage. Digestates were sampled for physicochemical and biogas quality analyses, with feedstocks categorized into D1 and D2, and a composite (D3) formed for struvite characterization. Microbial populations were enumerated on selective media, and struvite mineral content was analysed via argon plasma emission spectrometry.ResultsThe digesters processing feedstock mixtures D1 and D2 achieved specific methane yields of 1.26 L/g CODs fed and 1.49 L/g CODs fed, with cumulative biogas production of 374 and 369 L, respectively, over four 77‐day cycles. The two‐stage AD process significantly reduced antibiotic‐resistant, Enterobacteriaceae and Enterococcus spp. Total ammoniacal nitrogen (TAN) recovery rates were high at 98%–99%, with a consistent struvite crystal mass of 0.67 g/10 mL, indicating the efficiency of this integrated process. The agronomic value of struvite was determined, indicating its potential utility as a fertilizer, and scanning electron microscopy analysis revealed diverse crystal structures, warranting further investigation into their implications for usage and storage.ConclusionThe results suggests that the two‐stage AD process efficiently transforms organic waste into high‐quality biogas, reduces antibiotic‐resistant bacteria, and facilitates nutrient recovery through struvite precipitation. This approach supports co‐digestion of multi‐substrates and promotes circular economy principles, with potassium or sodium phosphate enhancing struvite recovery for sustainable agriculture.

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