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Sustainable nutrients recovery and recycling by optimizing the chemical addition sequence for struvite precipitation from raw swine slurries

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Sustainable nutrients recovery and recycling by optimizing the chemical addition sequence for struvite precipitation from raw swine slurries. / Taddeo, Raffaele; Kolppo, Kari; Lepistö, Raghida.

In: Journal of Environmental Management, Vol. 180, 15.09.2016, p. 52-58.

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Taddeo, Raffaele ; Kolppo, Kari ; Lepistö, Raghida. / Sustainable nutrients recovery and recycling by optimizing the chemical addition sequence for struvite precipitation from raw swine slurries. In: Journal of Environmental Management. 2016 ; Vol. 180. pp. 52-58.

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@article{b5fb912c37514b25b996d198e05686d7,
title = "Sustainable nutrients recovery and recycling by optimizing the chemical addition sequence for struvite precipitation from raw swine slurries",
abstract = "Livestock farming contributes heavily to nitrogen (N) and phosphorus (P) flows into the environment, a major cause of eutrophication of coastal and freshwater systems. Furthermore, the growing demand for N-P fertilizers is increasing the emission of anthropogenic reactive N into the atmosphere and the depletion of the current P reserves. Therefore, it is essential to minimize the anthropogenic impact on the environment and recycle the wasted N-P for agricultural reuse. This study focused on enhancing struvite (MgNH4PO4*6H2O) precipitation from raw swine slurries in batch and laboratory-scale reactors. Different chemical addition sequences were evaluated, and the best removal efficiency (E{\%}) was obtained when the chemicals were mixed before the precipitation process. Struvite was detected at a pH as low as 6 (E{\%}N-P∼50{\%}), and high E{\%}N-P was found at pH 7–9.5 (80–95{\%}). Furthermore, air stripping was used in place of NaOH to adjust pH, returning the same efficiency as if only alkali had been used. XRD and FE-SEM analysis of the precipitate showed that the recovered struvite was of high purity with orthorhombic crystalline structure and only trace amounts of impurities from matrix organics, co-precipitation products (CaO and amorphous calcium-phosphates), and residuals of added chemicals (MgO).",
keywords = "Air stripping, Chemical addition, Crystallization, Manure management, Nutrients recycling, Struvite",
author = "Raffaele Taddeo and Kari Kolppo and Raghida Lepist{\"o}",
year = "2016",
month = "9",
day = "15",
doi = "10.1016/j.jenvman.2016.05.009",
language = "English",
volume = "180",
pages = "52--58",
journal = "Journal of Environmental Management",
issn = "0301-4797",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Sustainable nutrients recovery and recycling by optimizing the chemical addition sequence for struvite precipitation from raw swine slurries

AU - Taddeo, Raffaele

AU - Kolppo, Kari

AU - Lepistö, Raghida

PY - 2016/9/15

Y1 - 2016/9/15

N2 - Livestock farming contributes heavily to nitrogen (N) and phosphorus (P) flows into the environment, a major cause of eutrophication of coastal and freshwater systems. Furthermore, the growing demand for N-P fertilizers is increasing the emission of anthropogenic reactive N into the atmosphere and the depletion of the current P reserves. Therefore, it is essential to minimize the anthropogenic impact on the environment and recycle the wasted N-P for agricultural reuse. This study focused on enhancing struvite (MgNH4PO4*6H2O) precipitation from raw swine slurries in batch and laboratory-scale reactors. Different chemical addition sequences were evaluated, and the best removal efficiency (E%) was obtained when the chemicals were mixed before the precipitation process. Struvite was detected at a pH as low as 6 (E%N-P∼50%), and high E%N-P was found at pH 7–9.5 (80–95%). Furthermore, air stripping was used in place of NaOH to adjust pH, returning the same efficiency as if only alkali had been used. XRD and FE-SEM analysis of the precipitate showed that the recovered struvite was of high purity with orthorhombic crystalline structure and only trace amounts of impurities from matrix organics, co-precipitation products (CaO and amorphous calcium-phosphates), and residuals of added chemicals (MgO).

AB - Livestock farming contributes heavily to nitrogen (N) and phosphorus (P) flows into the environment, a major cause of eutrophication of coastal and freshwater systems. Furthermore, the growing demand for N-P fertilizers is increasing the emission of anthropogenic reactive N into the atmosphere and the depletion of the current P reserves. Therefore, it is essential to minimize the anthropogenic impact on the environment and recycle the wasted N-P for agricultural reuse. This study focused on enhancing struvite (MgNH4PO4*6H2O) precipitation from raw swine slurries in batch and laboratory-scale reactors. Different chemical addition sequences were evaluated, and the best removal efficiency (E%) was obtained when the chemicals were mixed before the precipitation process. Struvite was detected at a pH as low as 6 (E%N-P∼50%), and high E%N-P was found at pH 7–9.5 (80–95%). Furthermore, air stripping was used in place of NaOH to adjust pH, returning the same efficiency as if only alkali had been used. XRD and FE-SEM analysis of the precipitate showed that the recovered struvite was of high purity with orthorhombic crystalline structure and only trace amounts of impurities from matrix organics, co-precipitation products (CaO and amorphous calcium-phosphates), and residuals of added chemicals (MgO).

KW - Air stripping

KW - Chemical addition

KW - Crystallization

KW - Manure management

KW - Nutrients recycling

KW - Struvite

U2 - 10.1016/j.jenvman.2016.05.009

DO - 10.1016/j.jenvman.2016.05.009

M3 - Article

VL - 180

SP - 52

EP - 58

JO - Journal of Environmental Management

JF - Journal of Environmental Management

SN - 0301-4797

ER -