Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, PR China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, PR China.
Hangzhou Yanqu Information Technology Co., Ltd, Y2, 2nd Floor, Building 2, Xixi Legu Creative Pioneering Park, No. 712 Wen'er West Road, Xihu District, Hangzhou City, Zhejiang Province 310003, PR China.
Water Res. 2024 May 1;254:121401. doi: 10.1016/j.watres.2024.121401. Epub 2024 Mar 1.
Although being viewed as a promising technology for reclamation of carbon and phosphorus from excess sludge, anaerobic fermentation (AF) grapples with issues such as a low yield of volatile fatty acids (VFAs) and high phosphorus recovery costs. In this study, we synthesized FeO@MOF-808 (FeM) with abundant defects and employed it to simultaneously enhance VFAs and phosphorus recovery during sludge anaerobic fermentation. Through pre-oxidization of sludge catalyzed by FeM-induced peroxydisulfate, the soluble organic matter increased by 2.54 times, thus providing ample substrate for VFAs production. Subsequent AF revealed a remarkable 732.73 % increase in VFAs and a 1592.95 % increase in phosphate. Factors contributing to the high VFAs yield include the non-biological catalysis of unsaturated Zr active sites in defective FeM, enhancing protein hydrolysis, and the inhibition of methanogenesis due to electron competition arising from the transformation between Fe(III) and Fe(II) under Zr influence. Remarkably, FeM exhibited an adsorption capacity of up to 92.64 % for dissolved phosphate through ligand exchange and electrostatic attractions. Furthermore, FeM demonstrated magnetic separation capability from the fermentation broth, coupled with excellent stability and reusability in both catalysis and adsorption processes.
虽然厌氧发酵（anaerobic fermentation，AF）被视为从剩余污泥中回收碳和磷的有前途的技术，但它面临着挥发性脂肪酸（volatile fatty acids，VFAs）产量低和高磷回收成本等问题。在本研究中，我们合成了具有丰富缺陷的 FeO@MOF-808（FeM），并将其用于在污泥厌氧发酵过程中同时提高 VFAs 和磷的回收。通过 FeM 诱导过硫酸盐催化的污泥预氧化，增加了 2.54 倍的可溶性有机物，从而为 VFAs 的产生提供了充足的底物。随后的 AF 显示 VFAs 增加了 732.73%，磷酸盐增加了 1592.95%。高 VFAs 产量的因素包括不饱和 Zr 活性位的非生物催化、增强蛋白质水解以及由于 Zr 影响下 Fe(III)和 Fe(II)之间的转化导致的电子竞争对甲烷生成的抑制。值得注意的是，FeM 通过配体交换和静电吸引对溶解的磷酸盐表现出高达 92.64%的吸附能力。此外，FeM 具有从发酵液中进行磁性分离的能力，并且在催化和吸附过程中表现出良好的稳定性和可重复使用性。
