Phosphorus release from ash, dried sludge and sludge residue from supercritical water oxidation by acid or base

Stark, Kristina; Płaza, Elżbieta; Hultman, Bengt

doi:10.1016/j.chemosphere.2005.04.069

Cited by 86 publications

(47 citation statements)

References 6 publications

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“…It was consistent with other works that the adjusting of pH could promote P release [26,30,31]. The increase of TP (L) under acidic condition was mostly ascribed to the dissolution of inorganic P and the release of poly-P in sludge, and that under alkaline condition was mainly because of the release of organic P from the sludge [5].…”

Section: Effect Of Ph On Tp (L) and P Fractions In Liquid Phasesupporting

confidence: 92%

pH dependent phosphorus release from waste activated sludge: contributions of phosphorus speciation

Liu

et al. 2015

Chemical Engineering Journal

185

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Section: Effect Of Ph On Tp (L) and P Fractions In Liquid Phasesupporting

confidence: 92%

pH dependent phosphorus release from waste activated sludge: contributions of phosphorus speciation

Liu

et al. 2015

Chemical Engineering Journal

185

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“…From figure 5 it is seen that the solubility of the phosphate in the experimental SSA is highly dependent on the pH-value to which it is exposed. This is in accordance to previous findings by Stark et al [14]. the pH value of cement ranges from 12.5 to 13.5 (Mehta and Monteiro [6]), and therefore the results for solution with 1.0M NaOH are most interesting.…”

Section: The Ph Dependence Of Phosphate Desorption In Comparison To Tsupporting

confidence: 81%

The necessity of recovering soluble phosphorus from sewage sludge ashes before use in concrete based on concrete setting and workability

Sigvardsen¹,

Ottosen²

2016

WIT Transactions on Ecology and the Environment

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By replacing cement with alternative ashes, such as sewage sludge ashes (SSA) from mono-incineration plants, it is possible to reduce CO 2 -emmision from the production of cement. SSA contains a large amount of phosphate which can be extracted before addition in concrete. The Danish Standard DS/EN 450-1 states an upper limit for total phosphorus in concrete, but it does not account for the solubility. The aim of this study is to determine an upper limit for soluble phosphorus in concrete, thus minimizing the formation of calcium phosphate to an acceptable level. The analysis will be based on the setting and workability. When adding soluble phosphorus salts to a mortar the setting process is extended with no pronounced difference between different soluble phosphorus salts. It is therefore assumed, that the soluble phosphorus (SP) influences the concrete setting. A logarithmic relationship between the increased addition of SP and the initial setting time is seen. By comparison with the limit for an initial setting time established in DS/EN 450-1 it is possible to establish a limit for SP of 0.54 wt% cement. When studying the workability an objective limit for SP of 0.16 wt% cement can be established. SSA from the Danish mono-incineration plant at Spildevandscenter Avedøre is examined. At a pH-value of 13 it is possible to replace 55% and 16% of the cement, based on the set limits, with SSA from Spildevandscenter Avedøre, before it is necessary to extract SP from SSA before adding to the concrete mixture. Former studies have shown a replacement of up to 20% of the cement with SSA is feasible regarding compressive strength, and therefore it is necessary to consider the limit for SP of 0.16% wt% cement.

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“…The dissolution of 80-100% of phosphate from ISSA by sulfuric acid is feasible, as previously demonstrated by other researchers (Oliver and Carey, 1976;Stark et al, 2006;Takahashi et al, 2001;Franz, 2008). However a different approach has been taken in this work that has attempted to produce a technical grade phosphoric acid from ISSA.…”

Section: Discussionmentioning

confidence: 57%

“…Stark et al (2006) reported that up to 87% of total phosphate in ISSA could be extracted with 1 mol.l -1 HCl at L/S ratio of 50 for 2 hours. Takahashi 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 5 10 for 1 hour.…”

Section: Introductionmentioning

confidence: 99%

Production of technical grade phosphoric acid from incinerator sewage sludge ash (ISSA)

2010

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Phosphorus release from ash, dried sludge and sludge residue from supercritical water oxidation by acid or base

Cited by 86 publications

References 6 publications

pH dependent phosphorus release from waste activated sludge: contributions of phosphorus speciation

pH dependent phosphorus release from waste activated sludge: contributions of phosphorus speciation

The necessity of recovering soluble phosphorus from sewage sludge ashes before use in concrete based on concrete setting and workability

Production of technical grade phosphoric acid from incinerator sewage sludge ash (ISSA)

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