当前位置: X-MOL 学术Water Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Unlocking phosphorus recovery from microalgae biomass: The enhanced transformation and release of phosphorus species
Water Research ( IF 11.4 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.watres.2025.123196
Liling Zhou, Jiabin Chen, Yajie Qian, Yalei Zhang, Egshiglen Batjargal, Baigal-Amar Tuulaikhuu, Xuefei Zhou

The intertwined challenges of harmful algae blooms and the phosphorus (P) resource crisis have necessitated the recovery of P from algae biomass. For the first time, a co-pyrolysis strategy that incorporates NaHCO3 into the pyrolysis process of chlorella to efficiently recover P in the form of vivianite was proposed. The findings demonstrated that the addition of 20 wt.% NaHCO3 during pyrolysis significantly enhanced P extraction from biochar, increasing the extraction efficiency from 2.8 % to 94.37 %. A complementary array of techniques including chemical extraction, nuclear magnetic resonance (NMR) spectroscopy, Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD), as well as two-dimensional correlation spectroscopy (2D-COS), was employed to elucidate the transformation of hard-to-extract P in chlorella to easy-to-extract P during pyrolysis. It was observed that organophosphorus (OP), pyrophosphate (pyro-P), and polyphosphates (poly-P) reacted with NaHCO3 at 700 °C, undergoing depolymerization and hydrolysis, which led to the formation of orthophosphate (ortho-P) species (e.g., Na3PO4, NaCa(PO4)3, (Fe2(PO4)3), accounting for 98.88 % of the P species in biochar product. High-purity vivianite (∼98.13 %) was subsequently obtained without the need for impurity removal, as indicated by chemical equilibrium simulations, due to the minimal ions and dissolved organic matter (DOM) present in the leaching solution, a consequence of the simple and pure structure of microalgae biomass. The estimated economic profit of this strategy is $1.51 per kilogram of dry chlorella. Additionally, the resulting biochar exhibited a high surface area (518.40 m2/g) and a well-developed pore structure, make it a promising material for adsorption and catalytic applications. This study provides a novel perspective for addressing the P crisis while effectively mitigating harmful algal blooms.

中文翻译:


从微藻生物质中释放磷:增强磷种类的转化和释放



有害藻类大量繁殖和磷 (P) 资源危机交织在一起的挑战,需要从藻类生物质中回收 P。首次提出了一种共热解策略,将 NaHCO3 掺入小球藻的热解过程中,以 vivianite 的形式有效回收 P。结果表明,在热解过程中添加 20 wt.% NaHCO3 显著提高了生物炭对磷的提取,将提取效率从 2.8 % 提高到 94.37 %。采用一系列互补的技术,包括化学提取、核磁共振 (NMR) 光谱、傅里叶变换红外光谱 (FTIR) 和 X 射线衍射 (XRD) 以及二维相关光谱 (2D-COS),阐明了小球藻中难以提取的 P 转化为易于提取的 P在热解过程中。据观察,有机磷 (OP)、焦磷酸盐 (pyro-P) 和多磷酸盐 (poly-P) 在 700 °C 下与 NaHCO3 反应,发生解聚和水解,导致形成正磷酸盐 (ortho-P) 物种(例如 Na3PO4、NaCa(PO43、(Fe2(PO43),占生物炭产品中 P 种类的 98.88 %。正如化学平衡模拟所示,由于浸出液中存在最少的离子和溶解有机物 (DOM),这是微藻生物质结构简单而纯净的结果,因此随后获得了高纯度的 vivianite (∼98.13 %),而无需去除杂质。该策略的估计经济利润为每公斤干小球藻 1.51 美元。 此外,所得生物炭表现出高表面积 (518.40 m2/g) 和发达的孔结构,使其成为吸附和催化应用的有前途的材料。这项研究为解决 P 危机提供了新的视角,同时有效缓解有害的藻华。
更新日期:2025-01-23
down
wechat
bug