Phosphorus Recovery from Sewage Sludge as Struvite
Environmental legislation on waste management coupled with the potential for nutrient recovery are key factors encouraging the use of advanced treatment technologies to manage biosolids waste. In this context, phosphorus recovery from sewage sludge treated by a wet oxidation (WO) process was carried...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/13/2382 |
| _version_ | 1797590780232073216 |
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| author | Javier Cañas Silvia Álvarez-Torrellas Blanca Hermana Juan García |
| author_facet | Javier Cañas Silvia Álvarez-Torrellas Blanca Hermana Juan García |
| author_sort | Javier Cañas |
| collection | DOAJ |
| description | Environmental legislation on waste management coupled with the potential for nutrient recovery are key factors encouraging the use of advanced treatment technologies to manage biosolids waste. In this context, phosphorus recovery from sewage sludge treated by a wet oxidation (WO) process was carried out in this work. High organic matter (up to 85% in COD) and total solids content (up to 75%) removal values were achieved by the WO process at elevated temperature (up to 300 °C) and pressure (up to 200 bar) conditions. The liquid and solid fractions found in the oxidation process effluent contain high amounts of phosphorus that can be recovered. This research aims to maximize its recovery in both liquid and solid fractions. In the liquid effluent, phosphorus was recovered (up to 90 mg P/L) by chemical precipitation as struvite (MgNH<sub>4</sub>PO<sub>4</sub>∙6 H<sub>2</sub>O), a slow-release fertilizer. In this case, P recoveries greater than 95% were achieved. Additionally, the solid fraction, analyzed after filtration and drying (68 mg P/g<sub>solid</sub>), was treated by acid leaching, obtaining up to 60% phosphorus recovery. All phosphorus extracted was in orthophosphate form. |
| first_indexed | 2024-03-11T01:25:22Z |
| format | Article |
| id | doaj.art-51f2f846d41a48618c134c254c4b7ae0 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-11T01:25:22Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-51f2f846d41a48618c134c254c4b7ae02023-11-18T17:47:23ZengMDPI AGWater2073-44412023-06-011513238210.3390/w15132382Phosphorus Recovery from Sewage Sludge as StruviteJavier Cañas0Silvia Álvarez-Torrellas1Blanca Hermana2Juan García3Catalysis and Separation Processes Group (CyPS), Chemical Engineering and Materials Department, Complutense University of Madrid, Avda. Complutense s/n, 28040 Madrid, SpainCatalysis and Separation Processes Group (CyPS), Chemical Engineering and Materials Department, Complutense University of Madrid, Avda. Complutense s/n, 28040 Madrid, SpainEcolotum, Energía Recuperable, S.L., Calle del Cidro 3, 28044 Madrid, SpainCatalysis and Separation Processes Group (CyPS), Chemical Engineering and Materials Department, Complutense University of Madrid, Avda. Complutense s/n, 28040 Madrid, SpainEnvironmental legislation on waste management coupled with the potential for nutrient recovery are key factors encouraging the use of advanced treatment technologies to manage biosolids waste. In this context, phosphorus recovery from sewage sludge treated by a wet oxidation (WO) process was carried out in this work. High organic matter (up to 85% in COD) and total solids content (up to 75%) removal values were achieved by the WO process at elevated temperature (up to 300 °C) and pressure (up to 200 bar) conditions. The liquid and solid fractions found in the oxidation process effluent contain high amounts of phosphorus that can be recovered. This research aims to maximize its recovery in both liquid and solid fractions. In the liquid effluent, phosphorus was recovered (up to 90 mg P/L) by chemical precipitation as struvite (MgNH<sub>4</sub>PO<sub>4</sub>∙6 H<sub>2</sub>O), a slow-release fertilizer. In this case, P recoveries greater than 95% were achieved. Additionally, the solid fraction, analyzed after filtration and drying (68 mg P/g<sub>solid</sub>), was treated by acid leaching, obtaining up to 60% phosphorus recovery. All phosphorus extracted was in orthophosphate form.https://www.mdpi.com/2073-4441/15/13/2382phosphorussewage sludgestruvitewet oxidation |
| spellingShingle | Javier Cañas Silvia Álvarez-Torrellas Blanca Hermana Juan García Phosphorus Recovery from Sewage Sludge as Struvite Water phosphorus sewage sludge struvite wet oxidation |
| title | Phosphorus Recovery from Sewage Sludge as Struvite |
| title_full | Phosphorus Recovery from Sewage Sludge as Struvite |
| title_fullStr | Phosphorus Recovery from Sewage Sludge as Struvite |
| title_full_unstemmed | Phosphorus Recovery from Sewage Sludge as Struvite |
| title_short | Phosphorus Recovery from Sewage Sludge as Struvite |
| title_sort | phosphorus recovery from sewage sludge as struvite |
| topic | phosphorus sewage sludge struvite wet oxidation |
| url | https://www.mdpi.com/2073-4441/15/13/2382 |
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