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Improving dewaterability of waste activated sludge by combined conditioning with zero-valent iron and hydrogen peroxide

Journal Article


Abstract


  • Improvement of sludge dewaterability is crucial for reducing the costs of sludge disposal in wastewater treatment plants. This study presents a novel method based on combined conditioning with zero-valent iron (ZVI) and hydrogen peroxide (HP) at pH 2.0 to improve dewaterability of a full-scale waste activated sludge (WAS). The combination of ZVI (0-750. mg/L) and HP (0-750. mg/L) at pH 2.0 substantially improved the WAS dewaterability due to Fenton-like reactions. The highest improvement in WAS dewaterability was attained at 500. mg ZVI/L and 250. mg HP/L, when the capillary suction time of the WAS was reduced by approximately 50%. Particle size distribution indicated that the sludge flocs were decomposed after conditioning. Economic analysis showed that combined conditioning with ZVI and HP was a more economically favorable method for improving WAS dewaterability than the classical Fenton reaction based method initiated by ferrous salts and HP.

Authors


  •   Zhou, Xu (external author)
  •   Wang, Qilin (external author)
  •   Jiang, Guangming
  •   Zhang, Xiwang (external author)
  •   Yuan, Zhiguo (external author)

Publication Date


  • 2014

Citation


  • Zhou, X., Wang, Q., Jiang, G., Zhang, X. & Yuan, Z. (2014). Improving dewaterability of waste activated sludge by combined conditioning with zero-valent iron and hydrogen peroxide. Bioresource Technology, 174 103-107.

Scopus Eid


  • 2-s2.0-84908278522

Number Of Pages


  • 4

Start Page


  • 103

End Page


  • 107

Volume


  • 174

Place Of Publication


  • Netherlands

Abstract


  • Improvement of sludge dewaterability is crucial for reducing the costs of sludge disposal in wastewater treatment plants. This study presents a novel method based on combined conditioning with zero-valent iron (ZVI) and hydrogen peroxide (HP) at pH 2.0 to improve dewaterability of a full-scale waste activated sludge (WAS). The combination of ZVI (0-750. mg/L) and HP (0-750. mg/L) at pH 2.0 substantially improved the WAS dewaterability due to Fenton-like reactions. The highest improvement in WAS dewaterability was attained at 500. mg ZVI/L and 250. mg HP/L, when the capillary suction time of the WAS was reduced by approximately 50%. Particle size distribution indicated that the sludge flocs were decomposed after conditioning. Economic analysis showed that combined conditioning with ZVI and HP was a more economically favorable method for improving WAS dewaterability than the classical Fenton reaction based method initiated by ferrous salts and HP.

Authors


  •   Zhou, Xu (external author)
  •   Wang, Qilin (external author)
  •   Jiang, Guangming
  •   Zhang, Xiwang (external author)
  •   Yuan, Zhiguo (external author)

Publication Date


  • 2014

Citation


  • Zhou, X., Wang, Q., Jiang, G., Zhang, X. & Yuan, Z. (2014). Improving dewaterability of waste activated sludge by combined conditioning with zero-valent iron and hydrogen peroxide. Bioresource Technology, 174 103-107.

Scopus Eid


  • 2-s2.0-84908278522

Number Of Pages


  • 4

Start Page


  • 103

End Page


  • 107

Volume


  • 174

Place Of Publication


  • Netherlands