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Influence of Phosphorus Speciation on Its Chemical Removal from Reject Water from Dewatering of Municipal Sewage Sludge

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  • Eliza Kulbat

    (Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 80-233 Gdansk, Poland)

  • Krzysztof Czerwionka

    (Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 80-233 Gdansk, Poland)

Abstract

The aim of the presented research was the assessment of phosphorus speciation impact on the precipitation of phosphorus in reject water using Ca(OH) 2 . To achieve this, phosphorus speciation (organic and inorganic phosphorus in suspension and in dissolved form) in reject water that is produced during sludge dewatering, after methane digestion in wastewater treatment plants (WWTPs), was determined. This study covered the materials from four WWTPs with different compositions of feedstock for anaerobic digestion (AnD). In one, the AnD process of primary and secondary sludge was carried out without co-substrate, while in three others, co-substrate (waste from the agri-food industry and external waste-activated sludge and fats from industrial plants) was examined. The investigation was conducted in batch reactors using doses of Ca(OH) 2 ranging from 2500 to 5500 mg Ca/dm 3 . The percentage of phosphorus forms determined in the raw reject water was similar, with the dominant form being soluble reactive phosphorus (SPR) (percentage from 87 to 96%). The small differences observed were dependent on the composition of the AnD feedstock. The results showed that, in all analysed wastewater, very high (exceeding 99.9%) phosphate phosphorus removal efficiencies were obtained using Ca(OH) 2 for short reaction times (t = 1 h). The efficiency of phosphate removal depended on pH but not on the forms of phosphorus in the analysed reject water.

Suggested Citation

  • Eliza Kulbat & Krzysztof Czerwionka, 2023. "Influence of Phosphorus Speciation on Its Chemical Removal from Reject Water from Dewatering of Municipal Sewage Sludge," Energies, MDPI, vol. 16(3), pages 1-12, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:3:p:1260-:d:1045847
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    References listed on IDEAS

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    1. Carolina González-Morales & Belén Fernández & Francisco J. Molina & Darío Naranjo-Fernández & Adriana Matamoros-Veloza & Miller Alonso Camargo-Valero, 2021. "Influence of pH and Temperature on Struvite Purity and Recovery from Anaerobic Digestate," Sustainability, MDPI, vol. 13(19), pages 1-14, September.
    2. Saba Daneshgar & Armando Buttafava & Doretta Capsoni & Arianna Callegari & Andrea G. Capodaglio, 2018. "Impact of pH and Ionic Molar Ratios on Phosphorous Forms Precipitation and Recovery from Different Wastewater Sludges," Resources, MDPI, vol. 7(4), pages 1-22, November.
    3. Anna Wilinska-Lisowska & Monika Ossowska & Krzysztof Czerwionka, 2021. "The Influence of Co-Fermentation of Agri-Food Waste with Primary Sludge on Biogas Production and Composition of the Liquid Fraction of Digestate," Energies, MDPI, vol. 14(7), pages 1-20, March.
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