About this Environmental Science article
An Integrated Strategy to Enhance Performance of Anaerobic Digestion of Waste Activated Sludge by Angelica Guerrero Calderon; Haoran Duan; Jia Meng; Jing Zhao; Yarong Song; Wenbo Yu; Zhetai Hu; Kangning Xu; Xiang Cheng; Shihu Hu; Zhiguo Yuan; Min Zheng is a Environmental Science article available to read on EtoBox.
Anaerobic digestion (AD) is an essential process in wastewater treatment plants as it can reduce the amount of waste activated sludge (WAS) for disposal, and also enables the recovery of bioenergy (i.e. methane). Here, a new pretreatment method to enhance anaerobic digestion was achieved by treating thickened WAS (TWAS) with ferric (as FeCl 3 ) and nitrite simultaneously for 24-hour at room temperature. Biochemical methane potential tests showed markedly improved degradability in the pretreated TWAS, with a relative increase in hydrolysis rate by 30%. A comparative experiment with the operation of two continuous-flow anaerobic digesters further demonstrated the improvement in biogas quantity and quality, digestate disposal, and phosphorus recovery in the experimental digester. The dosed FeCl 3 (i.e. ~6 mM) decreased the pH of TWAS to ~5, which led to the formation of free nitrous acid (FNA, HNO 2 ) at parts per million levels (i.e. ~6 mg N/L), after dosing nitrite at 250 mg NO 2 --N/L. This FNA treatment caused a 26% increase in methane yield and volatile solids destruction, 55% reduction in the viscosity of sludge in digester, and 24% less polymer required in further digestate dew
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- Author
- Angelica Guerrero Calderon; Haoran Duan; Jia Meng; Jing Zhao; Yarong Song; Wenbo Yu; Zhetai Hu; Kangning Xu; Xiang Cheng; Shihu Hu; Zhiguo Yuan; Min Zheng
- Publisher
- Elsevier BV
- Published
- 2021
- Language
- EN
- Field
- Environmental Science (Physical Sciences)