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Recovery of Nitrogen and Phosphorus from Swine Wastewater Using Construction Wastes

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Abstract:

Previous studies have demonstrated the effectiveness of struvite (MgNH4PO4·6H2O) precipitation for simultaneous recovery of phosphorus (P) and nitrogen (N) from wastewater as an alternative, sustainable option for recycling and removing nutrients. Magnesium plays an essential role in struvite formation, yet other divalent cations such as calcium (Ca2+) are also likely to be incorporated in the same precipitation reactions. In this study, construction wastes (CWs) were utilized as several rich calcium resources to recover nitrogen and phosphate in waste water through precipitation process. Ca in CW samples were leached by acidification process with (1%; 3% and 5%). At a concentration of 1% HCl, the calcium concentration was measured at 3200 mg Ca/L. This amount increased significantly to 7200 mg Ca/L and 7800mg/L when using 3% and 5% HCl, respectively. The resulting Ca-rich filtrate and phosphate was added to solution to recover high nitrogen concentration. The influence of pH and Ca:N:P molar ratio in the recovery of Ca,N, P was investigated. pH is 8.5, Ca:N:P molar ratio is 1.2:1:1 in 60 mins was optimal conditions for achieving N, P recovery efficiency. The results of the phase transition of the compounds were evaluated, when Calcium was utilized the recovery efficiency of phosphate was higher compared to nitrogen.

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Periodical:

Engineering Headway (Volume 40)

Pages:

31-40

DOI:

https://doi.org/10.4028/p-4fVDNY

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Online since:

July 2026

Authors:

Tran Thi To Uyen, Nguyen Trong Tin, Nguyen Quoc Dung, Tran Thi Minh Hang, Pham Thi Kieu Trang, Nguyen Thi Mai, Hoang Minh Trang, Nguyen Manh Khai*

Keywords:

Nitrogen, Phosphorus, Swine Wastewater

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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