Evidence of vivianite in FeSO4-flocculated sludges

Frossard, Emmanuel; Bauer, J.; Lothe, F.

doi:10.1016/s0043-1354(97)00101-2

Cited by 101 publications

(46 citation statements)

References 12 publications

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“…In Fe‐untr, which originated from sludge treated only with Fe salts, the XANES spectra indicated the presence of Fe phosphate. Phosphorus removal with Fe salts can result in the formation of vivianite (Frossard et al, 1997), strengite, or P sorbed to Fe‐hydroxides (Huang and Shenker, 2004; Parsons and Smith, 2008). The stabilization of sludge with aluminum salts or lime, on the other hand, leads to the formation of brushite (CaHPO 4 ×2H 2 O) and variscite or noncrystalline Ca phosphate, respectively (Huang and Shenker, 2004).…”

Section: Discussionmentioning

confidence: 99%

“…These techniques have been used to assess the P speciation in manures, composts, agro‐industrial by‐products, and waste materials, including sewage sludge (Frossard et al, 1994; Frossard et al, 1997; Frossard et al, 2002; Hunger et al, 2008; Kruse et al, 2010; Peak et al, 2002; Seiter et al, 2008; Shober et al, 2006; Sinaj et al, 2002). However, little information is available on the P speciation of untreated and thermo‐chemically treated SSAs.…”

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The Molecular Environment of Phosphorus in Sewage Sludge Ash: Implications for Bioavailability

et al. 2014

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Producing a P fertilizer from sewage sludge ash (SSA) is a strategy to efficiently recycle P from a secondary raw material. The P speciation in four SSAs was characterized before and after the removal of heavy metals by a thermo-chemical treatment that involved CaCl addition. We chose complementary techniques to determine the direct P speciation, including X-ray powder diffraction, solid-state P direct-polarization magic-angle spinning nuclear magnetic resonance, and X-ray absorption near edge structure. Results from these techniques were compared with operational and functional speciation information obtained from a sequential P extraction and a plant biotest with Italian ryegrass grown on a soil-sand mixture with little available P. The speciation of P in untreated and thermo-chemically treated SSAs depended on their elemental composition. At a molar ratio of Ca:P ≤ 2, SSAs contained combinations of polymorphs of AlPO, β-tricalcium phosphate, and apatite-like P species. In SSAs with a molar ratio of Ca:P > 2, an apatite-like molecular environment was predominant. The thermo-chemical process induced an increase in crystalline phases and enhanced the crystallinity of the P species. The structural order of the bulk sample was the most decisive parameter in controlling the P availability of the studied SSAs to plants. We conclude that, to produce a high-quality fertilizer and despite of the successful heavy metal removal, the thermo-chemical process requires further development toward enhanced P bioavailability.

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Section: Discussionmentioning

confidence: 99%

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The Molecular Environment of Phosphorus in Sewage Sludge Ash: Implications for Bioavailability

et al. 2014

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“…2). Vivianite is known to precipitate in the sludge as a consequence of SS treatment (coagulant addition, digestion, dewatering, reducing conditions) [38]. Also, a low intensity peak at 3.25Å (31.9 • Co K␣ 2Â), corresponding to the rutile (TiO 2 ) major peak, was observed -according to ICP-AES data, TiO 2 mass content (if it is considered that all the major elements are in their oxide form) is about 0.25% in the DSS and 0.9% in the GSSR.…”

Section: Xrd Measurementsmentioning

confidence: 99%

Mineralogy and leachability of gasified sewage sludge solid residues

Hernández

Ferrasse

Chaurand

et al. 2011

Journal of Hazardous Materials

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“…X-ray powder diffraction (XRD) can be applied to waste products for the detection of crystalline phases containing inorganic P. It has been used for the identification of different Fe-/Al-bound P, Ca phosphates such as whitlockite and apatite in sludge and sludge ashes (Frossard et al 1997;Kim et al 2013;Nanzer et al 2014) and struvite in dairy manure (Güngör et al 2007;Hunger et al 2008). When X-rays interact with crystalline matter, diffraction patterns are produced, which are unique to the crystal lattice.…”

Section: Introductionmentioning

confidence: 99%

Waste products as alternative phosphorus fertilisers part I: inorganic P species affect fertilisation effects depending on soil pH

Brod

Øgaard

Hansen

et al. 2015

Nutr Cycl Agroecosyst

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One of the bottlenecks to efficient phosphorus (P) recycling is limited understanding of the relationships between inorganic P species in waste products and their P fertilisation effects. In this study, we characterised inorganic P species in seven waste products (two biomass ashes, meat bone meal, fish sludge, catering waste and two food waste-based digestate products) and two manure products (dairy and chicken manure) by: (1) Sequential chemical fractionation, (2) X-ray powder diffraction and (3) solid-state 31 P MAS-NMR spectroscopy. We then used the characterisation data to explain the results of a bioassay studying the fertilisation effects of waste and manure products after application to a nutrientdeficient model soil that was limed to two pH levels (approximately pH 5.5 and 6.9 at pH level 1 and 2), with ryegrass (Lolium multiflorum) as the experimental crop. The P in waste products was mainly present as a complex mixture of inorganic P species, predominantly Ca phosphates with differing solubility. Fertilisation effects were largely explained by sequential fractionation data, with a positive relationship between apparent P use efficiency and the H 2 Osoluble inorganic P fraction at pH level 1 (R 2 = 0.52) and a negative relationship between apparent P use efficiency and the HCl-soluble inorganic P fraction at pH level 2 (R 2 = 0.66). X-ray powder diffraction and solid-state 31 P MAS-NMR spectroscopy confirmed the sequential fractionation data, but provided little additional information.

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Evidence of vivianite in FeSO4-flocculated sludges

Cited by 101 publications

References 12 publications

The Molecular Environment of Phosphorus in Sewage Sludge Ash: Implications for Bioavailability

The Molecular Environment of Phosphorus in Sewage Sludge Ash: Implications for Bioavailability

Mineralogy and leachability of gasified sewage sludge solid residues

Waste products as alternative phosphorus fertilisers part I: inorganic P species affect fertilisation effects depending on soil pH

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