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Phosphorus Sorption to Aluminum‐based Water Treatment Residuals Reacted with Dairy Wastewater: 2. X‐Ray Absorption Spectroscopy

Journal Article · · Journal of Environmental Quality
 [1];  [2];  [3];  [2]
  1. Dep. of Earth and Environmental Sciences California State Univ. East Bay Hayward CA 94542
  2. MIGAL–Galilee Research Institute Hydro‐Geochemistry Lab. Kiryat Shmona 11016 Tel Hai College, Upper Galilee Israel
  3. Dep. of Soil and Crop Sciences Colorado State Univ. Fort Collins CO 80523‐1170

Phosphorus capture from wastewater can decrease water pollution and provide a P‐rich fertilizer alternative for use in agricultural production. This study was conducted to elucidate P retention mechanisms in Al‐based water treatment residuals (Al‐WTR) to gain insight regarding P sorption and the potential for P release from Al‐WTR after reaction with dairy wastewater. Synchrotron‐based microfocused X‐ray fluorescence (micro‐XRF) spectrometry, bulk P K ‐edge X‐ray absorption near edge structure spectroscopy (XANES), and P K ‐edge micro‐XANES spectroscopy were used to determine P distribution and speciation within the Al‐WTR materials. Bulk XANES analyses indicated a shift from ∼56 P atom % Ca‐associated P in the initial Al‐WTR to ∼32% P atom % Ca‐associated P after reaction with wastewater; Al‐associated P made up the remainder of the P species. According to XANES analyses, adsorption appeared to be the primary P retention mechanism in the Al‐WTR materials. However, micro‐XANES analyses depicted a more complicated picture of P retention mechanisms, with regions of primarily Al‐associated P, regions of primarily Ca‐associated P, regions of mixed Al‐ and Ca‐associated P, and distinct apatite‐ or octocalcium phosphate‐like P grains. Synchrotron micro‐XRF mapping further suggested that exposure of the aggregate exteriors to wastewater caused P to diffuse into the porous Al‐WTR aggregates. Organic P species were not explicitly identified via P K ‐edge XANES despite high organic matter content, suggesting that organic P may have been predominantly associated with mineral surfaces. Although diffusion and sorption to Al may decrease P bioavailability, Ca‐associated P may increase P bioavailability from Al‐WTR that is reused as a soil amendment.

Core Ideas

XAS provided unambiguous evidence of P associations with Al and Ca in water treatment residuals.

Phosphorus adsorbed to Al and Ca surfaces in Al‐based water treatment residuals.

Grains of apatite‐ or octocalcium phosphate‐like P were found in water treatment residuals.

Phosphorus diffused into aggregates on reaction with P‐rich wastewater.

Evidence from electron microscopy and XRD complemented these findings.

Sponsoring Organization:
USDOE
OSTI ID:
1582082
Journal Information:
Journal of Environmental Quality, Journal Name: Journal of Environmental Quality Journal Issue: 3 Vol. 47; ISSN 0047-2425
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United States
Language:
English

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