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With the increase in population, water consumption is rising. This situation leads to increase in wastewater and decrease in usable water. While treating wastewater, there are residual materials such as sewage sludges. Among the possible management options, they can be incinerated. The output of the incineration process (sewage sludge ash) can be further treated to recover valuable products (e.g. phosphorus fertilizers), while leaving still some materials that need to be disposed of. Cement-based materials can be considered an alternative to contain this material as sustainable solution. In this study, sewage sludge ash was acid-leached with two different acids (HCl and H2SO4) to extract the phosphorus to be valorized in agricultural activities. The solid residue after acid-wet leaching constitutes approximately 90% of the ash and its recovery is important to reduce waste production. In this study, this material was considered as sand replacement (25%) in mortar. Two different mix designs for each material were examined. Since the ash residues at issue have a very high-water absorption capacity which hardly can be measured due to mud-like behavior when mixed with water, the first mix design was determined by adding water to the mixes calculated for ASR to replace 25% of the sand from the reference, to obtain the same workability as the reference. Through this method, cement dosage per unit volume actually decreased. In the second mix design, the cement amount was kept the same as in the reference mix, and half of the additional water of Mix Design 1 was used as additional water; workability was adjusted with a superplasticizer. This study examines five mixes tested for flexural and compressive strength at 7 days and 28 days. Also, 3 of these mixes were tested on the 56th day. A reduction in strength was observed in all mix designs compared to the reference mix. However, the second mix design with HCl leached sewage sludge features an acceptable strength decrease even with the increase in water amount in this study and can be deemed as suitable for practical applications.

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Mechanical Performance Investigation of Mortar with Acid-Leached Sewage Sludge Ash

  • 会议论文

  • 发表日期：

    2026年

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  • Elifsu Balci,
  • Job Beelen,
  • Giovanni Dolci,
  • Andrea Turolla,
  • Roberto Canziani,
  • Elke Gruyaert,
  • Liberato Ferrara

摘要

With the increase in population, water consumption is rising. This situation leads to increase in wastewater and decrease in usable water. While treating wastewater, there are residual materials such as sewage sludges. Among the possible management options, they can be incinerated. The output of the incineration process (sewage sludge ash) can be further treated to recover valuable products (e.g. phosphorus fertilizers), while leaving still some materials that need to be disposed of. Cement-based materials can be considered an alternative to contain this material as sustainable solution. In this study, sewage sludge ash was acid-leached with two different acids (HCl and H2SO4) to extract the phosphorus to be valorized in agricultural activities. The solid residue after acid-wet leaching constitutes approximately 90% of the ash and its recovery is important to reduce waste production. In this study, this material was considered as sand replacement (25%) in mortar. Two different mix designs for each material were examined. Since the ash residues at issue have a very high-water absorption capacity which hardly can be measured due to mud-like behavior when mixed with water, the first mix design was determined by adding water to the mixes calculated for ASR to replace 25% of the sand from the reference, to obtain the same workability as the reference. Through this method, cement dosage per unit volume actually decreased. In the second mix design, the cement amount was kept the same as in the reference mix, and half of the additional water of Mix Design 1 was used as additional water; workability was adjusted with a superplasticizer. This study examines five mixes tested for flexural and compressive strength at 7 days and 28 days. Also, 3 of these mixes were tested on the 56th day. A reduction in strength was observed in all mix designs compared to the reference mix. However, the second mix design with HCl leached sewage sludge features an acceptable strength decrease even with the increase in water amount in this study and can be deemed as suitable for practical applications.