Phosphorus bioavailability in ash from straw and sewage sludge processed by low‐temperature biomass gasification

Müller-Stöver, Dorette Sophie; Jakobsen, Iver; Grønlund, Mette; Rolsted, Morten Mikkel Mejlhede; Magid, Jakob; Hauggaard-Nielsen, Henrik

doi:10.1111/sum.12399

Cited by 14 publications

(12 citation statements)

References 35 publications

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“…The higher average RFA of sludges found in the low‐pH soil was ascribed to the greater solubility of Ca phosphate forms under lower pH; but see the discussion below for more details. The RFA level of sludges in the moderately acidic soil in this study was within the range of previously reported relative fertilizer efficiencies of 62–86% ( Frossard et al, 1996b) and 69% ( Lemming et al, 2017) found in pot experiments under moderately acidic conditions, and was comparable to the 70% reported for chemically precipitated sludges from a range of different studies ( Glæsner et al, 2016) or 60% reported in the review by Müller‐Stöver et al (2018). Under more neutral soil conditions (soil pH = 7.2), Øgaard and Brod (2016) found an average relative fertilizer value of 11 sewage sludge sludges of 34% (ranging from 19–51%, based on ryegrass cut at 14–26 weeks after sowing), i.e ., more similar to the RFA found under the moderately alkaline pH conditions in the present soil incubation study.…”

Section: Discussionsupporting

confidence: 90%

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Phosphorus availability of sewage sludges and ashes in soils of contrasting pH

Lemming

Nielsen

Jensen

et al. 2020

J. Plant Nutr. Soil Sci.

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Background: Little is known about the relationship between plant availability of P in different sludges and their derived ashes, its development over time and its interaction with soil pH.Aim: This study addresses this knowledge gap, by investigating the P availability and fractions of six sludges produced under different conditions and the incineration ashes derived from five of these, plus the effect of time (84 days) and soil pH on P availability.Methods: These materials were applied to two similar soils with contrasting pH (5.8 and 7.8), based on the assumption that lower pH would favor plant availability of P from these sources. Triple super phosphate and a control (no P addition) were included as references.Results: The relative P fertilizer availability (RFA) in soil of both sludges (18–77%) and ashes (0.1–25%), measured as water extractable P, was found to be highly dependent on their origin. While the P availability of sludges was strongly affected by soil pH, ash P availability showed either no or little soil pH effect, in contrast to our expectations. For the sludges, RFA was negatively correlated to the ratio (Fe+Al)/P in both pH soils and positively correlated to sludge water extractable P in the higher pH soil. For the ashes, the ratio Fe+Al to P and the pH reaction of ashes in water were strongly negatively correlated with RFA in the lower pH soil. Ca/P ratios did not predict RFA in either sludges or ashes. Nevertheless, we ascribe the comparably higher average RFA in sludges of 58% found in the low pH soil compared to 25% in the alkaline soil to the greater solubility of Ca‐P species under lower pH. For ashes, the availability increased over time, while rather stable for sludges.Conclusion: In conclusion, the P availability of both sludges and ashes was highly dependent on their origin, and for sludges highly dependent on soil pH

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Section: Discussionsupporting

confidence: 90%

“…Hence, the very low availability from this ash was most likely due to some particular impacts of the low‐temperature gasification process. This type of effect has also been shown by ( Müller‐Stöver et al, 2018), and ascribed to the formation of an inert carbon matrix resulting from the gasification ( Müller‐Stöver et al, 2012).…”

Section: Discussionsupporting

confidence: 64%

Phosphorus availability of sewage sludges and ashes in soils of contrasting pH

Lemming

Nielsen

Jensen

et al. 2020

J. Plant Nutr. Soil Sci.

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“…Gondek et al [110] found that during the pyrolysis of SS, the contents of P WS decreased. Also, SSA from low temperature gasification contains very little P available to plants [111]. As reported by some researchers, metaphosphate and the P associated with C bridged by O were the main species in pyrolysis biochar [112].…”

Section: Transformation Of P In Sewage Sludge During Thermal Treatmentmentioning

confidence: 87%

Sewage Sludge Thermal Treatment Technologies with a Focus on Phosphorus Recovery: A Review

Kwapiński

Kolinovic

Leahy

2021

Waste Biomass Valor

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Phosphorus presents a limited, irreplaceable and essential nutrient necessary for the growth of organisms. There is an increasing effort to recover phosphorus from production waste streams. Sewage sludge presents an important source of phosphorus but also contains organic pollutants and heavy metals. Thermal treatment technologies seem to be a promising option to treat sewage sludge and obtain ash/char from which high recovery rate of phosphorus can be reached. In this review, sewage sludge management options in compliance with EU legal requirements are first reviewed. Follows, an overview of sewage sludge thermal treatment technologies including incineration, hydrothermal carbonisation, pyrolysis and gasification, for the purpose of phosphorus recapture. We summarize recent advances in thermal treatment processes of sewage sludge and phosphorus recovery, identify challenges and knowledge gaps. Thermochemical methods proved to have many advantages over pure wet chemical methods for phosphorus recovery. The review provides the foundation for future research aimed at achieving efficient, economic and environmental sustainable recapture of phosphorus from sludge thermal treatment products.

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“…Thus, SOM increased by 47.5%-90.4%, and TN increased by 26.0%-68.0%, and soil alkalihydrolyzed nitrogen increased by 47.5%-90.4% (P< 0.05) after straw return. Further, the increase in SOM, which competes with soil particles, reduced the number of soil adsorption sites of phosphorus [33]; this was effectively complemented by the organic acids produced by organic decomposition, which can form chelates that further weaken the fixation effect of phosphorus in the soil and increase the bioavailability of phosphorus in saline-sodic soils [34]; additionally, straw contains large amounts of phosphorus, therefore, the concentration of available phosphorus after straw return increased by 107.7%-421.1% (P<0.05). Furthermore, the application of straw carried a large number of K + , Ca + and Mg + ions, which not only increased the nutrient content of the soil, but also reduced SAR and ESP of the experimental saline-sodic soil.…”

Section: Fermenting Straw Return Proved Beneficial For Reducing the E...mentioning

confidence: 99%

Fermenting straw reduced salt damage and improved the stability of the bacterial community in a saline–sodic soil

Du¹

2022

JASA

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This study aimed to explore the potential of fermenting straw return for remediation of soil salinity. A sealed–pot experiment was used to evaluate four treatments: CK (0 g fermenting rice straw), T1 (120 g fermenting rice straw), T2 (240 g fermenting rice straw), and T3 (360 g fermenting rice straw). Using 13C isotope tracer technique and molecular biological techniques to detect the physical, chemical, and biological properties of saline–sodic soils. The results showed that a small amount of CO2 was produced upon addition of soda–alkali soil to the soil after straw was applied. Quantitative analysis showed that the proportion of CO32– reduction of total CO32– was peaked (4.90%) in treatment T3. Concomitantly, under this treatment soil pH, SAR and ESP were reduced, whereas soil porosity and K+, Ca2+, and Mg2+ concentrations, and total nitrogen (TN), SOM, and MBC were increased. PCoA analysis showed that the addition of straw significantly changed the community structure of bacteria in a saline–sodic soil, and increased the Chao1 and Shannon indexes. Straw application increased ryegrass shoot and root biomass without allelopathic effects in the saline–sodic soil used. Our results highlighted that rice straw should be collected and artificially decomposed after rice harvest and then applied for the reclamation of strongly saline–sodic soils in the Songnen Plain and other similar areas.

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Phosphorus bioavailability in ash from straw and sewage sludge processed by low‐temperature biomass gasification

Cited by 14 publications

References 35 publications

Phosphorus availability of sewage sludges and ashes in soils of contrasting pH

Phosphorus availability of sewage sludges and ashes in soils of contrasting pH

Sewage Sludge Thermal Treatment Technologies with a Focus on Phosphorus Recovery: A Review

Fermenting straw reduced salt damage and improved the stability of the bacterial community in a saline–sodic soil

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