2017
DOI: 10.1016/j.wasman.2016.11.030
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Sequential electrodialytic recovery of phosphorus from low-temperature gasification ashes of chemically precipitated sewage sludge

Abstract: Phosphorus recycling from secondary materials like sewage sludge ashes offers an alternative to mining of phosphates from primary resources and a mean to counteract the current phosphorous rock depletion concern. A separation of P from the bulk ash is normally required, due to its low plant availability and the presence of heavy metals. Previously, more than 80% of P was recovered from incineration sewage sludge ashes using a two-compartment electrodialytic cell. In contrast, the recovery was below 30% for ash… Show more

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Cited by 19 publications
(4 citation statements)
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“…The detected absence of calcium-containing phosphates, which include both alkaline-soluble P such as in Al/Fe­(III)–P bonds, and alkaline-insoluble Ca–P bonds, is beneficial in terms of the recovery of phosphorus from gasification ashes. As a matter of fact, this suggests that a single-stage alkaline extraction process can be adopted, differently from what typically occurs with other SS gasification ashes, where sequential P-extraction processes are needed to solubilize the different Ca-bearing phases in an acidic step, and the Al/Fe­(III)–P bonds in an alkaline step. , …”
Section: Resultsmentioning
confidence: 99%
“…The detected absence of calcium-containing phosphates, which include both alkaline-soluble P such as in Al/Fe­(III)–P bonds, and alkaline-insoluble Ca–P bonds, is beneficial in terms of the recovery of phosphorus from gasification ashes. As a matter of fact, this suggests that a single-stage alkaline extraction process can be adopted, differently from what typically occurs with other SS gasification ashes, where sequential P-extraction processes are needed to solubilize the different Ca-bearing phases in an acidic step, and the Al/Fe­(III)–P bonds in an alkaline step. , …”
Section: Resultsmentioning
confidence: 99%
“…Depending on the treatment train, heavy metals can be of concern, but several efforts are under way to reduce heavy metal contamination by subsequent processes such as membrane separation (e.g. Schaum et al, 2007;Par es Viader et al, 2017), sorption (e.g. Xu, He, Gu, Wang, & Shao, 2012), or solvent extraction (e.g.…”
Section: Macronutrient Solutions (P)mentioning
confidence: 99%
“…Furthermore, an hydrothermal carbonisation process has been carried out to recover phosphorus from an anaerobic granular sludge [17]. Phosphorus has also been extracted from sewage sludge [18] and sewage sludge ash [19] using an electro-membrane technique. However, the above studies did not study the utilisation of energy for the phosphorus extraction nor on its optimisation.…”
Section: Introductionmentioning
confidence: 99%