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Sludge from water purification plants is a byproduct with high moisture and organic content, challenging to solidify with conventional cement. Alkali-activated GGBS (Granulated blast furnace slag powder) cementitious material was used to solidify water purification sludge. The solidification effects and mechanisms were explored through unconfined compressive strength (UCS) tests, water stability tests, and scanning electron microscopy. Results show that alkali-activated mineral powder effectively solidifies water purification sludge. The 28-day UCS of solidified sludge samples under 10, 20, 30, and 40% mineral powder content conditions were 0MPa, 0.19MPa, 1.27MPa, and 1.70MPa, respectively. After 28 days of soaking, the UCS of sludge samples with 20%, 30%, and 40% mineral powder content and a 28-day curing period were 0.39MPa, 0.72MPa, and 0.78MPa, respectively. Hydration products of alkali-activated mineral powder can effectively binding sludge particles/aggregates, enhancing the microstructural density of solidified sludge, and thus improving the strength and water stability of the solidified sludge.

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Experimental Study on the Strength and Water Stability of Alkali Activated Mineral Powder Solidification of Water Treatment Plant Wastewater and Mud

  • 会议论文

  • 发表日期：

    2026年

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  • Kangbing Zou,
  • Yu Zhou,
  • Zhenjie Song,
  • Xiangmao Zeng,
  • Deluan Feng,
  • Junchao Yang,
  • Zao Ling,
  • Shihua Liang,
  • Zhenkun Hou,
  • Zikang Chen,
  • Feng Ye

摘要

Sludge from water purification plants is a byproduct with high moisture and organic content, challenging to solidify with conventional cement. Alkali-activated GGBS (Granulated blast furnace slag powder) cementitious material was used to solidify water purification sludge. The solidification effects and mechanisms were explored through unconfined compressive strength (UCS) tests, water stability tests, and scanning electron microscopy. Results show that alkali-activated mineral powder effectively solidifies water purification sludge. The 28-day UCS of solidified sludge samples under 10, 20, 30, and 40% mineral powder content conditions were 0MPa, 0.19MPa, 1.27MPa, and 1.70MPa, respectively. After 28 days of soaking, the UCS of sludge samples with 20%, 30%, and 40% mineral powder content and a 28-day curing period were 0.39MPa, 0.72MPa, and 0.78MPa, respectively. Hydration products of alkali-activated mineral powder can effectively binding sludge particles/aggregates, enhancing the microstructural density of solidified sludge, and thus improving the strength and water stability of the solidified sludge.