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<p>Rapid and effective dewatering of sludge remains a significant challenge in sludge treatment processes. The impact of industrial by-products like phosphogypsum on sludge dewatering has not been thoroughly investigated. This study addresses this gap by examining the effects of phosphogypsum treatment on sludge dewatering performance. Various dosages of phosphogypsum (0.1&#xa0;g/gDS to 0.5&#xa0;g/gDS) were added to sludge samples, which were then analyzed for pH, specific resistance to filtration (SRF), water content (WC), settling performance (SV30), filtrate turbidity, and particle size distribution. Additionally, scanning electron microscopy (SEM) and pore size analysis were employed to assess microstructural changes. The results revealed that phosphogypsum treatment enhances sludge dewatering performance, with optimal results observed at a 0.3&#xa0;g/gDS dosage. At this optimal dosage, the coefficient of uniformity (Cu) of the sludge particles and the sludge pore size reached their maximum values. The Ca²⁺ ions in phosphogypsum improve sludge dewatering through charge neutralization and double-layer compression. An appropriate amount of phosphogypsum also enhances settling performance and reduces filtrate turbidity. However, excessive phosphogypsum addition negatively impacts settling, leading to increased filtrate turbidity. This study is of significant importance for advancing sludge dewatering treatment and promoting the utilization of solid waste.</p>

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Analysis of Sludge Dewatering Performance Based on Phosphogypsum Conditioning

  • 期刊论文

  • 发表日期：

    2025年5月10日

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  • Yunjie Hao,
  • Yongzheng Qi

摘要

Rapid and effective dewatering of sludge remains a significant challenge in sludge treatment processes. The impact of industrial by-products like phosphogypsum on sludge dewatering has not been thoroughly investigated. This study addresses this gap by examining the effects of phosphogypsum treatment on sludge dewatering performance. Various dosages of phosphogypsum (0.1 g/gDS to 0.5 g/gDS) were added to sludge samples, which were then analyzed for pH, specific resistance to filtration (SRF), water content (WC), settling performance (SV30), filtrate turbidity, and particle size distribution. Additionally, scanning electron microscopy (SEM) and pore size analysis were employed to assess microstructural changes. The results revealed that phosphogypsum treatment enhances sludge dewatering performance, with optimal results observed at a 0.3 g/gDS dosage. At this optimal dosage, the coefficient of uniformity (Cu) of the sludge particles and the sludge pore size reached their maximum values. The Ca²⁺ ions in phosphogypsum improve sludge dewatering through charge neutralization and double-layer compression. An appropriate amount of phosphogypsum also enhances settling performance and reduces filtrate turbidity. However, excessive phosphogypsum addition negatively impacts settling, leading to increased filtrate turbidity. This study is of significant importance for advancing sludge dewatering treatment and promoting the utilization of solid waste.