Adapted Hedley fractionation for the analysis of inorganic phosphate in biogas digestate

Dinkler, Konstantin; Li, Bowen; Guo, Jianbin; Hülsemann, Benedikt; Becker, Gero C.; Müller, Joachim; Oechsner, Hans

doi:10.1016/j.biortech.2021.125038

Cited by 15 publications

(10 citation statements)

References 34 publications

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“…Overall, it can be assumed that a slight overestimation is happening during the course of the sequential extraction steps as reported previously . If the OP fraction, especially that present in DSS, is also recovered in one or more of the first extraction steps, it cannot be traced back by ICP analytics alone.…”

Section: Resultsmentioning

confidence: 99%

“…Hedley Fractionation. The Hedley method was used like adapted by Dou et al 23 for manure measurement and further adapted by Dinkler et al 6 for digestates. A sample of 0.5 g is subjected to subsequent extractions as shown in Figure 2 and further described in detail by Dinkler et al Each extraction step is followed by additional rinsing steps of the filter cake with the extractant to avoid carryover of solved phosphate to the next extraction.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…Overall, it can be assumed that a slight overestimation is happening during the course of the sequential extraction steps as reported previously. 6 If the OP fraction, especially that present in DSS, is also recovered in one or more of the first extraction steps, it cannot be traced back by ICP analytics alone. This could be relevant for samples with a higher organic P content, and a double check with ICP and photometric phosphate determination together should be carried out.…”

Section: Comparison Of Wet and Dry Conversionmentioning

confidence: 99%

“…Therefore, the selection of the right tools heavily depends on what is used by the scientific community. A recent development, especially for the assessment of the transformation of phosphate species in (hydro) thermal conversion is the application of harmonized extraction schemes. − Depending on the solubility of phosphate in different mixtures of acids and basis, the corresponding different pH values, and exchangeable ligands, the approach enables (in theory) an allocation of phosphate to certain compound classes, such as organic or inorganic, short-term plant-available, labile, or stable phosphate as well as rough classification to certain mineral classes such as apatite or nonapatite phosphate. As a first assessment, these extraction schemes provide usually more insights than just total phosphorus and are often more applicable for complex matrices like sewage sludge than, e.g., XRD, as most of the sewage sludge-inherent inorganic phosphate species are not crystalline and therefore hardly detectable …”

Section: Introductionmentioning

confidence: 99%

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Discussion of Classical Phosphate Extraction Schemes to Identify Speciation in (Hydro-) Thermochemically Treated Sewage Sludge

Becker,

Kruse

2023

ACS Sustainable Chem. Eng.

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Understanding phosphate speciation in thermally treated sewage sludge is important for fertilization and technological phosphate recovery. Different extraction schemes including the soil phosphate-related Hedley fractionation and the freshwater sediment-related SMT protocol are widely used in the literature to describe (hydro-) thermochemically provoked changes in sewage sludge phosphate species. The results are usually directly linked to the solubility and bioavailability. This work discusses the applicability and interpretation of these two most widely used schemes in the case study of a thermochemically treated aluminate-rich municipal sewage sludge. The studied conversion technologies are low-and high-temperature hydrothermal conversions (190 and 250 °C, respectively) and fast as well as slow pyrolysis (15 s to 7.5 min retention time, 500 °C reaction temperature). Hydrothermal treatment clearly shows a change from phosphate-related to Fe-and Al-ion associations to Ca phosphate species in both extraction schemes, while this is seen to a lesser extent after pyrolysis. Phosphate fractions, which can be believed to be plant-available, are only shown in the Hedley fractionation. They disappear during hydrothermal treatment, probably following desorption mechanisms similar to effects mimicked by common extraction tests for plant-available soil phosphate. The sequential nature of the Hedley fractionation also revealed a reduced solubility of pyrolytically altered phosphates in dilute mineral acid, which is not seen in the SMT protocol to the same extent. Therefore, the use of SMT protocol results to compare changes after hydrothermal and pyrolytic treatment can lead to the wrong assumption that the resulting phosphate fractions are similar in nature, while at the same time, directly plant-available phosphate fractions are neglected.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: Comparison Of Wet and Dry Conversionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Discussion of Classical Phosphate Extraction Schemes to Identify Speciation in (Hydro-) Thermochemically Treated Sewage Sludge

Becker,

Kruse

2023

ACS Sustainable Chem. Eng.

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“…This method has gained international recognition from foreign researchers. Dinkler et al. (2021) primarily utilize the PSI and DPS methods to evaluate the potential for phosphorus transport and release.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus adsorption characteristics and release risk in saline soils: a case study of Songnen Plain, China

Jiang,

Yan,

Liu

et al. 2023

Front. Plant Sci.

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IntroductionThe Songnen Plain is one of the three major saline-alkali areas in China, covering a vast area, where drought and overgrazing have exacerbated the salinization trend, and will have great potential for development if utilized rationally. Phosphorus, as one of important soil nutrients, plays a crucial role in plant growth. How to minimize its loss and migration has become a current research hotspot. The objective of the present study was to elucidate the adsorption properties of phosphorus in soils affected by salinization and to establish the correlation between the potential for phosphorus release and soil properties.MethodsA batch treatment test was conducted in this study using three soils with the various salinization degrees to examine the impact of environmental factors on the adsorption properties and potential release of phosphorus.Results and discussionIt was found that the maximum phosphorus adsorption by the three salinization soils in 0-360 minutes accounted for 86.8%-90.5% of the total adsorption capacity; the equilibrium adsorption capacity was: HS> MS> LS. In cases where the phosphorus level in the surrounding liquid is low, the three levels of salinized soils exhibited varying levels of phosphorus discharge, with the adsorbent acting as the origin of contaminants. The Pseudo-second-order model kinetics and Langmuir equation can well describe the adsorption process, and the adsorption process is spontaneous heat absorption with entropy increase. Increasing the pH led to an increase in the adsorption of phosphorus from the three salinized soils. Additionally, the adsorption was enhanced by introducing varying concentrations of Na+, Ca2+, and Al3+ to the background solution. The phosphorus eutrophication release risk (ERI) demonstrated a gradual decline as temperature increased. Correlation analysis revealed a noteworthy positive correlation between TN, TP, and ERI, as well as a significant negative correlation between CEC, K+, and ERI. Furthermore, there was a highly significant negative correlation between coarse silt and fine silt. Considering local climatic and environmental factors is crucial for controlling the adsorption capacity of phosphorus in various salinized soils, as it can unveil the mechanism of phosphorus adsorption and impact its migration and release risk.

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Interactions of Real Urine with Modified Palygorskite and Zeolite Focusing on Adsorption Mechanisms, Nutrient Bioavailability and Soil Conditioner Upgrade

Mitrogiannis¹,

Psychogiou²,

Bourazas³

et al. 2023

Water Air Soil Pollut

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Adapted Hedley fractionation for the analysis of inorganic phosphate in biogas digestate

Cited by 15 publications

References 34 publications

Discussion of Classical Phosphate Extraction Schemes to Identify Speciation in (Hydro-) Thermochemically Treated Sewage Sludge

Discussion of Classical Phosphate Extraction Schemes to Identify Speciation in (Hydro-) Thermochemically Treated Sewage Sludge

Phosphorus adsorption characteristics and release risk in saline soils: a case study of Songnen Plain, China

Interactions of Real Urine with Modified Palygorskite and Zeolite Focusing on Adsorption Mechanisms, Nutrient Bioavailability and Soil Conditioner Upgrade

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