التفاصيل البيبلوغرافية
| العنوان: |
Phosphorus recovery from municipal solid waste digestate aiming at its valorization as a fertilizer ; Recuperação de fósforo de digestato de resíduos urbanos com vista à sua valorização como fertilizante |
| المؤلفون: |
Oliveira, Verónica Costa |
| المساهمون: |
Ferreira, Célia Maria Dias, Labrincha, João António, Monteiro, Maria do Carmo Simões Mendonça Horta |
| سنة النشر: |
2021 |
| المجموعة: |
Repositório Institucional da Universidade de Aveiro (RIA) |
| مصطلحات موضوعية: |
Electrodialytic process, Phosphorus recycling, Struvite, Agronomic trials, Nutrients, Circular economy, Resource management |
| الوصف: |
Phosphorus (P) is a vital nutrient for plant development and food production. It is a key fertilizer constituent and no feasible substitute has been found yet. P is mainly obtained from phosphate rock, which is a non-renewable resource. This raises the critical issue of ensuring a continuous supply of P-fertilizers to feed mankind in the future. Therefore, it is of utmost importance to promote the circularity of P by recycling and recovering P from waste streams. The municipal solid waste (MSW) digestate is the result of the anaerobic digestion of MSW. It contains P but also contaminants, so currently it is mostly sent to landfill. This raises the question of how feasible is the extraction of P from MSW digestate for the production of a high-quality fertilizer. The present research is focused on MSW digestate utilization as a secondary P resource. In this PhD thesis, the extraction of P from MSW digestate using the electrodialytic (ED) process combined with struvite formation is explored for the first time. The ED process allows the separation of anions (e.g. PO4 3-) and cations (e.g. metals like Cu2+) present in MSW digestate by selectively transporting them across ion-exchange membranes under the influence of an electric field. Considering this extraction principle, P extraction experiments were conducted at lab-scale attempting to reach three purposes: i) extraction of the P available in the MSW digestate, ii) optimization of the energy performance of the ED process and iii) improvement of ED process, allowing also to recover nitrogen (N) from MSW digestate. The ED-extracted P was used for the synthesis of secondary struvite (MgNH4PO4·6H2O), through chemical precipitation. Alternative sources of N and magnesium (Mg) needed for the synthesis of struvite were explored, named seawater (as Mg source) and N contained in the MSW digestate itself. Acting as a slow-release fertilizer, struvite releases nutrients to the soil along the time. The agronomic efficacy of the secondary struvite, obtained using the P ... |
| نوع الوثيقة: |
doctoral or postdoctoral thesis |
| اللغة: |
English |
| العلاقة: |
SFRH/BD/115312/2016; http://hdl.handle.net/10773/31272Test; 101582412 |
| الإتاحة: |
http://hdl.handle.net/10773/31272Test |
| حقوق: |
openAccess ; https://creativecommons.org/licenses/by/4.0Test/ |
| رقم الانضمام: |
edsbas.1226D2E3 |
| قاعدة البيانات: |
BASE |
