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Updated: Feb 13, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
Published on: March 6, 2014
Dual-functional eggshell-derived system for comprehensive phosphorus recovery from agricultural wastewater: From
Qiao Wu1, Maoqing Fan2, Xiaoyu Zheng3
1Changsha Health Vocational College, Changsha 410605, China.
None:
The development of sustainable and economically feasible phosphorus recovery technology is of great significance to alleviate water eutrophication. This study proposed an innovative "one-waste, dual-use" strategy, involving the construction of a three-stage fixed-bed system integrating adsorption and Fenton-like oxidation. This system uses eggshell calcium-rich biochar (ESBC) as the phosphorus adsorbent and copper-functionalized eggshell membrane biochar (Cu@ESM) as the catalyst for organophosphorus mineralization. The results showed that the integrated system has excellent treatment performance under weak alkaline conditions (pH 8-9). In the laboratory-scale treatment of high-concentration phosphorus-containing synthetic wastewater (400 mg P/L), the system was stable for approximately 940 min before reaching a 50% breakthrough. The pilot-scale test (100 L/h) was further validated with real swine wastewater, and it was confirmed that the system could continuously treat about 582 L of wastewater before saturation, and the operation was stable and efficient. Furthermore, by optimizing the molar ratio of calcium to phosphorus, high-purity hydroxyapatite was recovered from the concentrated eluent. This study presents a scalable technology based on the integration of agricultural waste valorization and advanced wastewater treatment, providing a promising solution for sustainable phosphorus management and recovery.
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