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Reviews in Environmental Science and Bio/Technology

, Volume 14, Issue 3, pp 453–472 | Cite as

Overview of Fenton pre-treatment of sludge aiming to enhance anaerobic digestion

  • Sridhar Pilli
  • S. Yan
  • R. D. Tyagi
  • R. Y. Surampalli
Review paper

Abstract

Availability of the biodegradable matter in wastewater sludge limits the anaerobic digestion (AD) process efficiency. Therefore, sludge pre-treatment is required to increase sludge solid degradability and, in turn, AD efficiency. Advanced oxidation processes, particularly Fenton pre-treatment, are emerging as popular methods aiming to enhance sludge biodegradability. This review summarizes the major findings of Fenton pre-treatment application in sludge disintegration and dewaterability, and elucidates the impacts on both mesophilic and thermophilic digestion. Efforts are made to understand the effect of the Fenton pre-treatment of wastewater sludge on enhancing AD efficiency (increased biogas production and solids reduction) and outline the future research direction. A case study of mass–energy balance and greenhouse gas (GHG) emission computations for mesophilic and thermophilic digestion of control (without pre-treatment) and Fenton pre-treatment sludge at different sludge retention times is also illustrated.

Keywords

Fenton pre-treatment Sludge biodegradability Sludge dewaterability Anaerobic digestion 

Abbreviations

AD

Anaerobic digestion

BOD

Biochemical oxygen demand

CH4

Methane

CO2

Carbon dioxide

COD

Chemical oxygen demand

CST

Capillary suction time

ds

Dissolved solids

DD

Degree of disintegration

DS

Dry solids

Fe2+

Ferrous ion

GHG

Greenhouse gases

H2O2

Hydrogen peroxide

kg

Kilogram

kW

Kilowatt

kWh

Kilowatt hour

mL

Milliliter

N2O

Nitrous oxide

NH3

Ammonia

ODS

Organic dry solids

RFF

Resource for future

SCOD

Soluble chemical oxygen demand

SCODu

Soluble COD of untreated sludge

SCODm

Soluble COD of Fenton pre-treated

SRF

Specific resistance to filtration

SS

Suspended solids

VS

Volatile solids

VSS

Volatile suspended solids

WAS

Waste activated solids

WWTP

Wastewater treatment plant

WWTPs

Wastewater treatment plants

ΔODS

Difference of organic dry solids

Notes

Acknowledgments

The authors are sincerely thankful to the Natural Sciences and Engineering Research Council of Canada (NSERC) (Grants A4984, Canada Research Chair) for financial support. The views or opinions expressed in this article are those of the authors.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Sridhar Pilli
    • 1
  • S. Yan
    • 1
  • R. D. Tyagi
    • 1
  • R. Y. Surampalli
    • 2
  1. 1.INRS Eau, Terre, EnvironnementQuébecCanada
  2. 2.Department of Civil EngineeringUniversity of Nebraska-LincolnLincolnUSA

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