Extracting phosphorous from incinerated sewage sludge ash rich in iron or aluminum

Ottosen, Lisbeth M.; Kirkelund, Gunvor Marie; Jensen, Pernille Erland

doi:10.1016/j.chemosphere.2013.01.101

Cited by 138 publications

(94 citation statements)

References 12 publications

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“…The concentration of Fe in extracts strongly depends on the mineral composition of SSA; this in turn is related to the chemical and thermal treatment of sewage sludge (Table 1) [15,23,24]. The highest concentration of iron in extracts was obtained for Szczecin Slag SSA while the lowest was for Gdynia SSA.…”

Section: Resultsmentioning

confidence: 99%

“…The P in SSA is not readily available as it appears mostly in the form of calcium phosphate, stanfieldite, whitlockite and berlinite. The gain in crop yield when spreading the ash directly is consequently limited due to its insolubility within the soil environment [7,15,16].…”

Section: Introductionmentioning

confidence: 99%

“…The type of the precipitating agent is also significant: iron or aluminium salts used for phosphorus compound precipitation cause a higher concentration of Fe or Al in ash. The presence of heavy metals (HM) like lead, zinc, cadmium and nickel disqualify SSA from direct usage as a fertilizer (despite a high phosphorus concentration) [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…It was revealed that phosphorus recovery by particle separation is not possible. Its dissolution from ash particles either by thermal separation or wet chemical treatment is necessary [14][15][16]18,19]. This paper presents research on the phosphorus recovery from SSA using wet chemical treatment with nitric acid.…”

Section: Introductionmentioning

confidence: 99%

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Characteristic of wet method of phosphorus recovery from polish sewage sludge ash with nitric acid

et al. 2016

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Sewage Sludge Ash (SSA) is a concentrated source of phosphorus and can be successfully recycled via a number of different routes. This paper presents research results on phosphorus recovery from differently combusted sewage sludge with the use of nitric acid extraction. Different SSA forms from Polish thermal utilization stations were compared. It was revealed that sewage treatment technology as well as combustion technology influence many physical and chemical parameters of ashes that are crucial for further phosphorus recovery from such waste according to the proposed method. Presented research defines extraction efficiency, characterized extracts composition and verifies the possibility of using SSA as cheaper and alternative sources of phosphorus compounds. Gdynia, Kielce and Kraków SSA have the best properties for the proposed technology of phosphorus recovery with high extraction efficiency greater than 86%. Unsuitable results were obtained for Bydgoszcz, Szczecin Slag and Warszawa SSA. Extraction process for Łódź and Szczecin Dust SSA need to be improved for a higher phosphorus extraction efficiency greater than 80%.Phosphorus content in extracts varies from 1.6 to 103.4 g PO 4 3-per 1 dm 3 , nitrogen content was 167,4 g per 1 dm 3 while the K content reached 0.2 to 2.37 g per 1 dm 3 . The lowest content of Fe, Ni, Cr, Cd is noted in extracts after phosphorus recovery from Gdynia SSA, where the phosphorus content is also at the highest level.The proposed solution can be considered as waste minimization technology by the rational recycling of phosphorus and could be used in industry to produce fertilizers.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristic of wet method of phosphorus recovery from polish sewage sludge ash with nitric acid

et al. 2016

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“…Energy recovery processes, like incineration, have been adopted for some of the sewage sludge in developed economies like Europe, Japan or the United States (Samolada & Zabaniotou 2014). However, only a minor part of the resulting SSA are used in the production of fertilizers, due to the presence of heavy metals (HMs) (Ottosen et al 2013;Ebbers et al 2015;Parés Viader et al, 2015) and the high content of Al and Fe, which makes it unsuitable for traditional processing methods of PR (Scholz et al 2014). Thus, around 300,000 Mg of mono-incineration SSA are produced per year in Germany, the biggest producer in the European Union (EU), most of which is currently landfilled or used in construction materials (Krüger et al 2014(Krüger et al , 2015.…”

Section: Introductionmentioning

confidence: 99%

Comparison of phosphorus recovery from incineration and gasification sewage sludge ash

Viader

Jensen

Ottosen

et al. 2016

Water Science and Technology

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Incineration of sewage sludge is a common practice in many western countries. Gasification is an attractive option because of its high energy efficiency and flexibility in the usage of the produced gas. However, they both unavoidably produce sewage sludge ashes, a material which is rich in phosphorus, but that it is commonly landfilled or used in construction materials. With current uncertainty in phosphate rock supply, phosphorus recovery from sewage sludge ashes has become interesting. In the present work, ashes from incineration and gasification of the same sewage sludge were compared in terms of phosphorus extractability using electrodialytic methods. The results show that comparable recovery rates of phosphorus were achieved with a single electrodialytic step for incineration ashes and a sequential combination of two electrodialytic steps for gasification ashes, which was due to a higher influence of iron and/or aluminium in phosphorus solubility for the latter. A product with lower level of metallic impurities and comparable to wet process phosphoric acid was eventually obtained from gasification ashes. Thus, gasification becomes an interesting alternative to incineration also in terms of phosphorus separation.

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Thermal‐Chemical Treatment of Sewage Sludge Toward Enhanced Energy and Resource Recovery

Guo

et al. 2021

Sustainable Resource Management, Volume I

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Extracting phosphorous from incinerated sewage sludge ash rich in iron or aluminum

Cited by 138 publications

References 12 publications

Characteristic of wet method of phosphorus recovery from polish sewage sludge ash with nitric acid

Characteristic of wet method of phosphorus recovery from polish sewage sludge ash with nitric acid

Comparison of phosphorus recovery from incineration and gasification sewage sludge ash

Thermal‐Chemical Treatment of Sewage Sludge Toward Enhanced Energy and Resource Recovery

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