pH regulated potassium ferrate oxidation promotes acetic acid yield and phosphorous recovery rate from waste activated sludge

Simin Zou, Yannan Ruan, Hongbo Liu, Jonathan Wong, Suyun Xu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

To improve the dose efficiency of K2FeO4 in waste activated sludge (WAS) treatment, pH regulation on K2FeO4 pretreatment and acidogenic fermentation was investigated. Four pretreatments were compared, i.e. pH3 + 50 g/kg-TS, pH10 + 50 g/kg-TS, neutral pH + 50 g/kg-TS and neutral pH + 100 g/kg-TS (without pH adjustment). The higher short chain fatty acids (SCFAs) yield and phosphorous dissolution rate was found under the condition of pH 10.0. In pH10 + 50 g/kg-TS, the maximum concentration of SCFAs was 5591 mg-COD/L, which yield was 22.6 times higher than that of the neutral pH + 50 g/kg-TS (237 mg COD/L). The acidogenic fermentation period could be shortened to 5 days and acetic acid accounted for 70 % of SCFAs. Furthermore, PO43--P in the hydrolysate (346.5 mg/L) accounted for 47.59 % of TP, which is easier to be recovered by chemical precipitation. Therefore, a more economical and feasible utilization mode of potassium ferrate was proposed.

Original languageEnglish
Article number127816
Number of pages11
JournalBioresource Technology
Volume362
DOIs
Publication statusPublished - Oct 2022

Scopus Subject Areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

User-Defined Keywords

  • Anaerobic fermentation
  • pH regulation
  • Phosphorus
  • Potassium ferrate pretreatment
  • Short-chain fatty acids
  • Waste activated sludge

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