GUOYiqun,DINGYanyan,YUHongyu,et al.Struvite Crystallization for Phosphorus Recovery from Slurry of Advanced Anaerobic Digestion of Sewage Sludge[J].China Water & Wastewater,2026,42(7):106-112.
鸟粪石结晶法回收污泥高级厌氧消化沼液中的磷
- Title:
- Struvite Crystallization for Phosphorus Recovery from Slurry of Advanced Anaerobic Digestion of Sewage Sludge
- 关键词:
- 污泥高级厌氧消化沼液; 磷回收; 鸟粪石; 氨氮
- Keywords:
- advanced anaerobic digestion slurry of sludge; recovery of phosphorus; struvite; ammonia nitrogen
- 摘要:
- 从沼液中结晶鸟粪石（MAP）是回收磷的有效途径。针对污泥高温热水解-高含固厌氧消化沼液氮磷比（物质的量之比）高的特性，通过单因素实验和Box-Behnken Design（BBD）响应曲面实验，以磷回收率为响应值，对pH、镁磷比、反应时间、搅拌速度等条件进行优化，确定MAP结晶法回收沼液中磷的最佳条件。响应曲面分析显示，当氮磷比高达29时，最佳反应条件为：pH=8.8、镁磷比=1.36、搅拌速度=292 r/min、反应时间=10 min，磷回收率高达99%以上。当pH=9.0、镁磷比=1.0、搅拌速度=300 r/min、反应时间=20 min时，鸟粪石的纯度最高，达到98.04%。随着镁磷比的升高，鸟粪石的纯度降低。氨氮浓度是影响MAP结晶法的关键因素，虽然MAP结晶法高效回收磷需要过量氨氮，但当氨氮浓度达到一定阈值后，磷回收率趋于稳定，且接近100%。因此，针对氮磷比过高的高含固厌氧消化沼液可以投加磷源，进一步实现氮的同步回收。
- Abstract:
- Crystallization of struvite (magnesium ammonium phosphate, MAP) from slurry is an effective method for phosphorus recovery. This study investigated the optimization of MAP crystallization conditions in slurry with a high nitrogen-to-phosphorus (N/P) molar ratio, resulting from thermal hydrolysis combined with high-solid anaerobic digestion. Through single-factor experiments and Box-Behnken Design (BBD) response surface methodology, the phosphorus recovery rate was used as the response variable to optimize reaction parameters, including pH, magnesium-to-phosphorus (Mg/P) molar ratio, reaction time, and stirring speed. The results indicated that under optimal conditions—pH of 8.8, Mg/P molar ratio of 1.36, stirring speed of 292 r/min, and reaction time of 10 minutes—the phosphorus recovery rate exceeded 99%, even when the N/P molar ratio was as high as 29. Furthermore, at pH of 9.0, Mg/P molar ratio of 1.0, stirring speed of 300 r/min, and reaction time of 20 minutes, the purity of MAP crystals reached a maximum of 98.04%. Increasing the Mg/P molar ratio beyond this point led to a decrease in MAP purity. Ammonia nitrogen concentration was identified as a critical factor influencing MAP crystallization. While an excess of ammonia nitrogen was required for efficient phosphorus recovery, the phosphorus recovery efficiency stabilized and approached 100% once the ammonia nitrogen concentration surpassed a certain threshold. Therefore, for slurry with an excessively high N/P molar ratio, adding a phosphorus source can facilitate the simultaneous recovery of nitrogen.
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