Phosphorus complexation of sewage sludge during thermal hydrolysis with different reaction temperature and reaction time by P K-edge XANES and 31P NMR
| Autor: | Shuhu Liu, Rongfang Yuan, Ling Gao, Ru Zhang, Yan Lu, Xiaomin Han, Fei Wang, Xiaoqin Zhou, Beihai Zhou, Huilun Chen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences Phosphorus Extraction (chemistry) chemistry.chemical_element 010501 environmental sciences Thermal hydrolysis Phosphate 01 natural sciences Pollution XANES chemistry.chemical_compound Anaerobic digestion chemistry Environmental Chemistry Absorption (chemistry) Waste Management and Disposal Sludge 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Science of The Total Environment. 688:1-9 |
| ISSN: | 0048-9697 |
| Popis: | Thermal hydrolysis pretreatment (THP) can improve sludge disintegration and biogas production. Phosphorus (P) is immobilized on hydrochars of sewage sludge (SS). It is critical to understand changes in P speciation in SS hydrochars under different reaction temperatures and reaction times during THP for reclamation and (re)cycling of P. This study combined sequential extraction, 31P liquid and solid-state nuclear magnetic resonance (NMR), and P K-edge X-ray absorption near edge structure (XANES) spectroscopy to systematically analyze variation in P speciation and related metals in hydrochars. The temperature of the THP has more influence on P extraction content than reaction time; the bioavailability of P from hydrochars declined with increasing temperature. A 31P liquid and solid-state NMR analysis demonstrated that orthophosphate was the most abundant phosphate present small deviations in the chemical shift were observed in different samples under different conditions. The results of XANES demonstrated that CaP was more stable than FeP and AlP. LCF results suggested OcataCa proportion raised under stable CaP ratio in samples when the temperature was above 155 °C and duration was 60 min. This study provides a theoretical basis that can meet the practical application of THP for sludge disposal and P reclamation on subsequent anaerobic digestion. |
| Databáze: | OpenAIRE |
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