Glycine-assisted phosphorus release and recovery from waste-activated sludge†

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

ACS Applied Electronic Materials Pub Date : 2024-08-28 DOI:10.1039/D4EW00158C

Sheqi Cen, Yao Zou, Hang Chen, Xuhan Deng, Fu Huang, Liping Chen, Le Li, Tenghui Jin, Chaohai Wei, Lichao Nengzi and Guanglei Qiu

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Abstract

This study reports a sustainable and green method for phosphorus (P) extraction and recovery from waste activated sludge (WAS) using glycine as a P-extraction agent. Glycine showed an extraordinary ability to induce P release from waste-activated sludge at a rate of 8.7 mg P per L per h without being consumed. The P-extraction rate was linearly related to the mixed liquor suspended solid concentration and was not affected by the temperature in the range of 25–35 °C. After extraction, the released P was recovered via calcium precipitation, resulting in high P-content (48%, as phosphate) products (dominated by amorphous calcium phosphate). An unparallel advantage of the method is the high recyclability of glycine. Repetitive experiments showed <10% glycine loss over four P-extraction–P-recovery–glycine-reuse cycles. Additionally, extremely low heavy metal contents were observed in the P-recovery products in comparison to the acid/alkali-assisted P extraction, indicating its environmental friendliness as a sustainable strategy for P recovery from WAS.

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甘氨酸辅助从废物活性污泥中释放和回收磷

本研究报告了一种利用甘氨酸作为磷萃取剂从废弃活性污泥（WAS）中萃取和回收磷（P）的可持续绿色方法。甘氨酸显示出了非凡的能力，它能以每小时每升 8.7 毫克磷的速率诱导废物活性污泥中的磷释放，而不会被消耗掉。萃取率与混合液悬浮固体浓度呈线性关系，在 25-35 °C 范围内不受温度影响。萃取后，通过钙沉淀回收释放的 P，得到高 P 含量（48%，以磷酸盐计）的产品（以无定形磷酸钙为主）。该方法的一个独特优势是甘氨酸的高回收率。重复实验表明，在四个提取 P-回收甘氨酸-再利用的循环过程中，甘氨酸的损失率为 10%。此外，与酸/碱辅助提取 P 相比，P 回收产品中的重金属含量极低，这表明该方法是一种可持续的从 WAS 中回收 P 的环境友好型策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567