Accelerated anaerobic release of K, Mg and P from surplus activated sludge for element recovery and struvite formation inhibition
| Autor: | Teruyuki Umita, A. Sato, Ayumi Ito, Nao Ishikawa, H. Kawakami, M. Ito, T. Oikawa |
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| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Struvite Potassium 0208 environmental biotechnology chemistry.chemical_element 02 engineering and technology Wastewater 010501 environmental sciences Waste Disposal Fluid 01 natural sciences chemistry.chemical_compound Magnesium Anaerobiosis 0105 earth and related environmental sciences Water Science and Technology Sewage Waste management Chemistry Phosphorus 020801 environmental engineering Anaerobic digestion Activated sludge Sodium acetate Anaerobic exercise Waste disposal Nuclear chemistry |
| Zdroj: | Water Science and Technology. 75:2149-2156 |
| ISSN: | 1996-9732 0273-1223 |
| DOI: | 10.2166/wst.2017.099 |
| Popis: | Accelerated release of potassium (K), magnesium (Mg) and phosphorus (P) from surplus activated sludge (SAS) was investigated to develop a new system for the recovery of the elements. Anaerobic cultivation of SAS during 24 h released 78% of K and about 50% of Mg and P from SAS more effectively compared to aerobic cultivation (K: 40%, Mg: 15%, P: 15%). Furthermore, the addition of sodium acetate as an organic carbon source remarkably accelerated the release of K, Mg and P from SAS under anaerobic condition. However, no increase in the maximum release efficiencies was observed. The elements released from SAS could be transferred to separate liquid with the existing mechanical thickener and be recovered as MgKPO4 by some additional process. Furthermore, the removal of the elements from SAS would inhibit the formation of struvite causing the blockage of sludge transport pipe after anaerobic digestion process of thickened sludge. |
| Databáze: | OpenAIRE |
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