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<p>The rapid increase in sewage sludge (SS) production and its potential environmental risks have attracted global attention, and pyrolysis is one promising method for disposal and resourceful utilization of SS. To investigate the transformation of phosphorus (P) forms during the pyrolysis process and the P release characteristics from the P-enriched biochar (PEBC), the P-enriched SS (PESS) was pyrolyzed at different temperatures (350–650&#xa0;°C) and different time (1–4&#xa0;h), the P forms and release characteristics of different PEBC were determined by sequential extraction, <sup>31</sup>P liquid nuclear magnetic resonance, and X-ray diffraction. The results showed that pyrolysis significantly increased the pH, specific surface area, ash content, and total P content of PEBC. With increasing pyrolysis temperature, the H<sub>2</sub>O-P (from 1.08 to 0.06&#xa0;mg/g), NaHCO<sub>3</sub>-P (from 5.00 to 0.69&#xa0;mg/g), and NaOH-P (from 19.94 to 9.47&#xa0;mg/g) were transformed into more stable forms (HCl-P, from 21.25 to 95.41&#xa0;mg/g; Res-P, from 3.28 to 15.43&#xa0;mg/g), but the orthophosphate only transformed into pyrophosphate at 350 and 450&#xa0;°C. With increasing the pyrolysis time, the H<sub>2</sub>O-P content increased 3.90 times (from 0.10 to 0.39&#xa0;mg/g), but its effect on P forms was negligible. The maximum P release content of PEBC3504 was 0.43&#xa0;mg/g, and the P release under different pH was initially controlled by diffusion process and then by steady dissolution of phosphate. These results indicate that low-temperature and long-time pyrolysis may be more effective in transforming P in PEBC to labile forms.</p>

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Pyrolysis of Phosphorus-enriched Sewage Sludge: Forms Transformation and Release Characteristics of Phosphorus

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Wenxiu Zheng,
  • Mengjiao Qiao,
  • Yifan Liu,
  • Lin Zhong,
  • Tong Chao,
  • Qidi Li,
  • Yangyang Wang

摘要

The rapid increase in sewage sludge (SS) production and its potential environmental risks have attracted global attention, and pyrolysis is one promising method for disposal and resourceful utilization of SS. To investigate the transformation of phosphorus (P) forms during the pyrolysis process and the P release characteristics from the P-enriched biochar (PEBC), the P-enriched SS (PESS) was pyrolyzed at different temperatures (350–650 °C) and different time (1–4 h), the P forms and release characteristics of different PEBC were determined by sequential extraction, 31P liquid nuclear magnetic resonance, and X-ray diffraction. The results showed that pyrolysis significantly increased the pH, specific surface area, ash content, and total P content of PEBC. With increasing pyrolysis temperature, the H2O-P (from 1.08 to 0.06 mg/g), NaHCO3-P (from 5.00 to 0.69 mg/g), and NaOH-P (from 19.94 to 9.47 mg/g) were transformed into more stable forms (HCl-P, from 21.25 to 95.41 mg/g; Res-P, from 3.28 to 15.43 mg/g), but the orthophosphate only transformed into pyrophosphate at 350 and 450 °C. With increasing the pyrolysis time, the H2O-P content increased 3.90 times (from 0.10 to 0.39 mg/g), but its effect on P forms was negligible. The maximum P release content of PEBC3504 was 0.43 mg/g, and the P release under different pH was initially controlled by diffusion process and then by steady dissolution of phosphate. These results indicate that low-temperature and long-time pyrolysis may be more effective in transforming P in PEBC to labile forms.