Slaughterhouse wastewater treatment by a combined anaerobic digestion/solar photoelectro-Fenton process performed in semicontinuous operation

Jorge Vidal, Andrea Carvajal, Cesar Huiliñir*, Ricardo Salazar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

A new semicontinuous anaerobic digestion/solar photoelectro-Fenton (SPEF) process for the treatment of slaughterhouse wastewater is studied. An Upflow Anaerobic Sludge Blanket (UASB) reactor was used at two different organic load rates (OLR) (3.94 and 8.15 g COD L−1 d−1), while the SPEF was carried out in a photoelectrochemical reactor using a filter press cell with a DSA anode and an air diffusion cathode. The results showed that the UASB reactor achieved up to 70% COD removal for the highest OLR, with a low efficiency of suspended solid removal. The anaerobic effluent was treated by the SPEF process, resulting in 88% and 72% COD removal for the initial concentrations of 195 ± 14 mg L−1 and 867 ± 52 mg L−1, respectively, and a turbidity reduction of up to 80%. The treatment of wastewater by SPEF using a current density of 10 mA cm−2 was five times less costly than that of 25 mA cm−2, with an associated cost of 1.4 USD h−1 for the treatment. The proposed semicontinuous processes eliminate at least 91% of the total COD, thus representing a new option for the treatment of slaughterhouse wastewater.

Original languageEnglish
Article number122097
JournalChemical Engineering Journal
Volume378
DOIs
StatePublished - 15 Dec 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

  • Anaerobic digestion
  • Combined processes
  • Slaughterhouse wastewater
  • Solar photoelectro-Fenton process
  • UASB reactor

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