Struvite precipitation from the liquid fraction of the digestate of a municipal waste biogas plant

• Autorzy: Urbanowska Agnieszka , Polowczyk Izabela , Kabsch-Korbutowicz Małgorzata

Identyfikatory

DOI

10.37190/epe210406

• Języki publikacji: EN

Abstrakty

EN

Currently, municipal waste biogas plant digestate is treated both as an alternative fertilizer and as a potential source of water. In practice, before advanced purification technologies, the liquid fraction of the digestate is subjected to pretreatment, aiming also at recovering the dissolved nutrients and making them into a concentrated fertilizer, e.g., by struvite precipitation. In this study, the possibility of struvite (MgNH₄PO₄ center dot 6H₂O) precipitation from the liquid fraction of municipal digestate was determined. In the experiments, MgCl₂ and NaH₂PO₄ were added to the treated solution as a complementary source of magnesium and phosphorus. Their doses were chosen to achieve the most favorable conditions for controlling struvite precipitation. The results obtained confirmed the possibility of struvite precipitation from the liquid fraction of municipal digestate. The process realized for pH 9.0, temperature 20-23 degrees C, molar ratio N:Mg:P = 5.13:1:1 and 1:1.1:1.1, reaction time 5 min with a stirring rate of 160 rpm, provides a high efficiency of struvite precipitation from the liquid fraction of digestate. From the viewpoint of process economics (less amount of reactants added with similar process efficiency), a molar ratio of N:Mg:P = 1:1.1:1.1 was found to be optimal for the reaction of precipitation.

Słowa kluczowe

EN

struvite; municipal waste; leachate; digestate

PL

struwit; odpad komunalny; odciek; poferment

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2021
• Tom: Vol. 47, nr 4
• Strony: 85--99
• Opis fizyczny: Bibliogr. 28 poz., rys., tab.

Twórcy

autor

Urbanowska Agnieszka

• Wrocław University of Science and Technology, Faculty of Environmental Engineering, Department of Environment Protection Engineering, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

• https://orcid.org/0000-0003-0087-8211

autor

Polowczyk Izabela

• Wrocław University of Science and Technology, Faculty of Chemistry, Department of Process Engineering, Technology of Polymer and Carbon Materials, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

• https://orcid.org/0000-0001-7445-9461

autor

Kabsch-Korbutowicz Małgorzata

• Wrocław University of Science and Technology, Faculty of Environmental Engineering, Department of Environment Protection Engineering, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

• https://orcid.org/0000-0002-8188-042X

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